US20050209610A1 - Radially adjustable tissue removal device - Google Patents

Radially adjustable tissue removal device Download PDF

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Publication number
US20050209610A1
US20050209610A1 US10/793,694 US79369404A US2005209610A1 US 20050209610 A1 US20050209610 A1 US 20050209610A1 US 79369404 A US79369404 A US 79369404A US 2005209610 A1 US2005209610 A1 US 2005209610A1
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Prior art keywords
tissue removal
tissue
distal end
cannula
removal element
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Abandoned
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US10/793,694
Inventor
Harold Carrison
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Boston Scientific Scimed Inc
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Scimed Life Systems Inc
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Priority to US10/793,694 priority Critical patent/US20050209610A1/en
Assigned to SCIMED LIFE SYSTEMS, INC. reassignment SCIMED LIFE SYSTEMS, INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: CARRISON, HAROLD F.
Publication of US20050209610A1 publication Critical patent/US20050209610A1/en
Assigned to BOSTON SCIENTIFIC SCIMED, INC. reassignment BOSTON SCIENTIFIC SCIMED, INC. CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). Assignors: SCIMED LIFE SYSTEMS, INC.
Priority to US13/777,409 priority patent/US9750509B2/en
Abandoned legal-status Critical Current

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    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/16Bone cutting, breaking or removal means other than saws, e.g. Osteoclasts; Drills or chisels for bones; Trepans
    • A61B17/1662Bone cutting, breaking or removal means other than saws, e.g. Osteoclasts; Drills or chisels for bones; Trepans for particular parts of the body
    • A61B17/1671Bone cutting, breaking or removal means other than saws, e.g. Osteoclasts; Drills or chisels for bones; Trepans for particular parts of the body for the spine
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/22Implements for squeezing-off ulcers or the like on the inside of inner organs of the body; Implements for scraping-out cavities of body organs, e.g. bones; Calculus removers; Calculus smashing apparatus; Apparatus for removing obstructions in blood vessels, not otherwise provided for
    • A61B17/221Gripping devices in the form of loops or baskets for gripping calculi or similar types of obstructions
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/32Surgical cutting instruments
    • A61B17/320016Endoscopic cutting instruments, e.g. arthroscopes, resectoscopes
    • A61B17/32002Endoscopic cutting instruments, e.g. arthroscopes, resectoscopes with continuously rotating, oscillating or reciprocating cutting instruments
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/32Surgical cutting instruments
    • A61B17/3205Excision instruments
    • A61B17/3207Atherectomy devices working by cutting or abrading; Similar devices specially adapted for non-vascular obstructions
    • A61B17/320758Atherectomy devices working by cutting or abrading; Similar devices specially adapted for non-vascular obstructions with a rotating cutting instrument, e.g. motor driven
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00Surgical instruments, devices or methods, e.g. tourniquets
    • A61B2017/00831Material properties
    • A61B2017/00867Material properties shape memory effect
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/22Implements for squeezing-off ulcers or the like on the inside of inner organs of the body; Implements for scraping-out cavities of body organs, e.g. bones; Calculus removers; Calculus smashing apparatus; Apparatus for removing obstructions in blood vessels, not otherwise provided for
    • A61B17/22031Gripping instruments, e.g. forceps, for removing or smashing calculi
    • A61B2017/22034Gripping instruments, e.g. forceps, for removing or smashing calculi for gripping the obstruction or the tissue part from inside
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/22Implements for squeezing-off ulcers or the like on the inside of inner organs of the body; Implements for scraping-out cavities of body organs, e.g. bones; Calculus removers; Calculus smashing apparatus; Apparatus for removing obstructions in blood vessels, not otherwise provided for
    • A61B17/221Gripping devices in the form of loops or baskets for gripping calculi or similar types of obstructions
    • A61B2017/2212Gripping devices in the form of loops or baskets for gripping calculi or similar types of obstructions having a closed distal end, e.g. a loop
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/22Implements for squeezing-off ulcers or the like on the inside of inner organs of the body; Implements for scraping-out cavities of body organs, e.g. bones; Calculus removers; Calculus smashing apparatus; Apparatus for removing obstructions in blood vessels, not otherwise provided for
    • A61B17/221Gripping devices in the form of loops or baskets for gripping calculi or similar types of obstructions
    • A61B2017/2215Gripping devices in the form of loops or baskets for gripping calculi or similar types of obstructions having an open distal end
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/28Surgical forceps
    • A61B17/29Forceps for use in minimally invasive surgery
    • A61B2017/2901Details of shaft
    • A61B2017/2905Details of shaft flexible
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/28Surgical forceps
    • A61B17/29Forceps for use in minimally invasive surgery
    • A61B2017/2926Details of heads or jaws
    • A61B2017/2927Details of heads or jaws the angular position of the head being adjustable with respect to the shaft
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/32Surgical cutting instruments
    • A61B2017/320004Surgical cutting instruments abrasive
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/32Surgical cutting instruments
    • A61B17/3205Excision instruments
    • A61B17/3207Atherectomy devices working by cutting or abrading; Similar devices specially adapted for non-vascular obstructions
    • A61B17/320758Atherectomy devices working by cutting or abrading; Similar devices specially adapted for non-vascular obstructions with a rotating cutting instrument, e.g. motor driven
    • A61B2017/320775Morcellators, impeller or propeller like means

Definitions

  • the field of the invention pertains to medical devices and methods for removing tissue, and in particular, vertebral bone and intervertebral disc tissue.
  • the spinal column consists of thirty-three bones called vertebra, the first twenty-four vertebrae of which make up the cervical, thoracic, and lumbar regions of the spine and are separated from each other by “pads” of tough cartilage called “intervertebral discs,” which act as shock absorbers that provide flexibility, stability, and pain-free movement of the spine.
  • FIGS. 1 and 2 illustrate a portion of a healthy and normal spine, and specifically, two vertebra 10 and two intervertebral discs 12 (only one shown).
  • the posterior of the vertebra 10 includes right and left transverse processes 14 R, 14 L, right and left superior articular processes 16 R, 16 L, and a spinous process 18 . Muscles and ligaments that move and stabilize the vertebra 10 are connected to these structures.
  • the vertebra 10 further includes a centrally located lamina 20 with right and left lamina 20 R, 20 L, that lie inbetween the spinous process 18 and the superior articular processes 16 R, 16 L.
  • Right and left pedicles 22 R, 22 L are positioned anterior to the right and left transverse processes 14 R, 14 L, respectively.
  • a vertebral arch 24 extends between the pedicles 22 and through the lamina 20 .
  • the anterior of the vertebra 10 includes a vertebral body 26 , which joins the vertebral arch 24 at the pedicles 22 .
  • the vertebral body 26 includes an interior volume of reticulated, cancellous bone (not shown) enclosed by a compact cortical bone 30 around the exterior.
  • the vertebral arch 24 and vertebral body 26 make up the spinal canal (i.e., the vertebral foramen 32 ), which is the opening through which the spinal cord 34 and epidural veins (not shown) pass. Nerve roots 36 laterally pass from the spinal cord 34 out through the neural foramen 38 at the side of the spinal canal formed between the pedicles 22 .
  • the intervertebral disc 12 consists of two parts: an inner gel-like nucleus (nucleus pulposus) 40 located centrally within the disc 12 , and tough fibrous outer annulus (annulus fibrosis) 42 surrounding the nucleus 40 .
  • a person may develop any one of a variety of debilitating spinal conditions and diseases.
  • the outer wall of the disc 12 ′ i.e., the annulus fibrosis 42
  • it may tear allowing the soft inner part of the disc 12 (i.e., the nucleus pulposus 40 ) to bulge out, forming a herniation 46 .
  • the herniated disc 12 ′ often pinches or compresses the adjacent dorsal root 36 against a portion of the vertebra 10 , resulting in weakness, tingling, numbness, or pain in the back, legs or arm areas.
  • inflammation from disc herniation can be treated successfully by nonsurgical means, such as bedrest, therapeutic exercise, oral anti-inflammatory medications or epidural injection of corticosterioids, and anesthetics.
  • nonsurgical means such as bedrest, therapeutic exercise, oral anti-inflammatory medications or epidural injection of corticosterioids, and anesthetics.
  • the disc tissue is irreparably damaged, in which case, surgery is the best option.
  • Discectomy which involves removing all, or a portion, of the affected disc, is the most common surgical treatment for ruptured or herniated discs of the lumbar spine. In most cases, a laminotomy or laminectomy is performed to visualize and access the affected disc. Once the vertebrae, disc, and other surrounding structures can be visualized, the surgeon will remove the section of the disc that is protruding from the disc wall and any other offending disc fragments that may have been expelled from the disc. In some cases, the entire disc may be removed, with or without a bony fusion or arthroplasty (disc nucleus replacement or total disc replacement).
  • Open discectomy is usually performed under general anesthesia and typically requires at least a one-day hospital stay. During this procedure, a two to three-inch incision in the skin over the affected area of the spine is made. Muscle tissue may be separated from the bone above and below the affected disc, while retractors hold the wound open so that the surgeon has a clear view of the vertebrae and disc and related structures. The disc or a portion thereof, can then be removed using standard medical equipment, such as rongeurs and curettes.
  • Microdiscectomy uses a microscope or magnifying instrument to view the disc.
  • the magnified view may make it possible for the surgeon to remove herniated disc material through a smaller incision (about twice as small as that required by open discectomy) with smaller instruments, potentially reducing damage to tissue that is intended to be preserved.
  • Percutaneous discectomy is often an outpatient procedure that may be carried out by utilizing hollow needles or cannulae through which special instruments can be deployed into the vertebra and disc in order to cut, remove, irrigate, and aspirate tissue.
  • X-ray pictures and a video screen and computer-aided workstation may be used to guide by the surgeon into the treatment region.
  • Improved imaging and video or computer guidance systems have the potential to reduce the amount of tissue removal required to access and treat the injured tissue or structures.
  • an endoscope is inserted to view the intradiscal and perivertebral area.
  • spinal stenosis which results from hypertrophic bone and soft tissue growth on a vertebra, reduces the space within the spinal canal.
  • the nerve roots are pinched, a painful, burning, tingling, and/or numbing sensation is felt down the lower back, down legs, and sometimes in the feet.
  • the spinal canal 32 has a rounded triangular shape that holds the spinal cord 34 without pinching.
  • the nerve roots 36 leave the spinal canal 32 through the nerve root canals 38 , which should be free of obstruction. As shown in FIG.
  • hypertrophic bone growth 48 e.g., bone spurs, osteophytes, spondylophytes
  • spinal canal 32 e.g., spinal spurs, osteophytes, spondylophytes
  • spinal stenosis may be treated by performing a laminectomy or laminectomy in order to decompress the nerve root 36 impinged by the bone growth 48 .
  • a foraminotomy i.e., enlarging of the channel from which the nerve roots 36 exit is performed).
  • the entire lamina and spinal process may be removed.
  • VCF vertebral body compression fracture
  • spinal injuries bone diseases such as osteoporosis, vertebral hemangiomas, multiple myeloma, necorotic lesions (Kummel's Disease, Avascular Necrosis), and metastatic disease, or other conditions that can cause painful collapse of vertebral bodies.
  • bone diseases such as osteoporosis, vertebral hemangiomas, multiple myeloma, necorotic lesions (Kummel's Disease, Avascular Necrosis), and metastatic disease, or other conditions that can cause painful collapse of vertebral bodies.
  • VCFs are common in patients who suffer from these medical conditions, often resulting in pain, compromises to activities of daily living, and even prolonged disability.
  • VCFs may be repaired by cutting, shaping, and removing damaged bone tissue inside a vertebra to create a void, and then injecting a bone cement percutaneously or packing bone graft into the void. This is typically accomplished percutaneously through a cannula to minimize tissue trauma.
  • the hardening (polymerization) of a bone cement media or bone grafting or other suitable biomaterial serves to buttress the bony vault of the vertebral body, providing both increased structural integrity and decreased pain that may be associated with micromotion and progressive collapse of the vertebrae.
  • bone and/or disc tissue must be removed in order to decompress neural tissue or rebuild the bony vertebra or intervertebral disc.
  • a physician is required to exercise extreme care when cutting away the target bone tissue (e.g., during a laminectomy and foraminotomy), such that injury to spinal tissue can be prevented.
  • a physician may have difficulty controlling existing bone removal devices, however, and may unintentionally remove healthy bone tissue or injure spinal tissue during use. This problem is exacerbated with percutaneous treatments, which, although less invasive than other procedures, limit the range of motion of the cutting instrument, thereby further limiting the control that the physician may have during the bone cutting procedure.
  • Burr-type tissue removal probes may also be used to remove soft tissue, such as the gel-like nuclear tissue within the intervertebral disc or the cancellous bone tissue within the vertebral body.
  • FIG. 5 illustrates one prior art burr-type tissue removal probe 50 that can be introduced through a delivery cannula (not shown) into contact with the target tissue region to be removed.
  • the tissue removal probe 50 comprises a rigid shaft 52 and a rotatable burr 54 associated with the distal end of the rigid shaft 52 . Rotation of a drive shaft 56 extending through the rigid shaft 52 , in turn, causes rotation of the burr 54 (either manually or via a motor), thereby removing tissue that comes in contact with the burr 54 .
  • the tissue removal probe 50 is laterally constrained within the cannula (or if a cannula is not shown, constrained by the many layers of tissue that the device 50 must traverse to reach the target tissue), and thus, can only be effectively moved along its longitudinal axis, thereby limiting the amount of tissue that can be removed to the tissue that is on-axis.
  • the tissue removal probe 50 may have to be introduced through several access points within the anatomical body (e.g., the disc or vertebral body) that contains the target tissue in order to remove the desired amount of the tissue.
  • the distal end 58 of the rigid shaft 52 may be curved in an alternative prior art removal device 60 , so that the burr 54 is off-axis from the shaft 52 .
  • off-axis target regions can be reached by rotating and axially displacing the rigid shaft 52 about its axis. Because the length of the curved distal end is fixed, however, only the tissue regions that are off-axis by a distance equal to the off-axis distance of the burr 54 will be removed, as illustrated in FIG. 7 .
  • the removal device 60 can only remove a cylindrical outline 62 of the tissue, leaving a cylindrical tissue body 64 behind.
  • the tissue removal probe 60 must still be introduced into the tissue via several access holes in order to remove any remaining tissue.
  • the delivery cannula must be made larger to accommodate the entire profile of the distal end.
  • the incision through which the cannula is introduced must likewise be made larger.
  • the anatomical body in which the removal device 60 is introduced is relatively thin (e.g., an intervertebral disc is a few millimeters thick)
  • the top or bottom of the anatomical body may hinder movement of the burr 54 as the shaft 52 is rotated around its axis.
  • the removal device 60 may have to be introduced along the bottom of the anatomical body to allow tissue to be removed at the top of the anatomical body (i.e., by sweeping the burr 54 along an upper arc until the burr 54 hits the top, or if clearance at the top is available, by sweeping the burr 54 along the upper arc, below the top, until the burr 54 hits the bottom), and then reintroduced along the top of the anatomical body to allow tissue to be removed at the bottom of the anatomical body (i.e., by sweeping the burr 54 along a lower arc until the burr 54 hits the bottom, or if clearance at the bottom is available, by sweeping the burr 54 along the lower arc, above the bottom, until the burr 54 hits the top).
  • this excessive movement of the removal device 60 increases the time of the spinal procedure as well as surgical risk due to manipulation of the device.
  • burr-type removal devices Another problem with current burr-type removal devices is that soft material, such as the nuclear material in an intervertebral disc or cancellous bone within the vertebral body, tends to stick to the burrs, thereby limiting the abrasive effect that the burrs are intended to have in order to efficiently remove tissue. As a result, burr-type removal device may have to be continuously removed from the patient's body in order to clean the soft tissue from the burr.
  • a media such as saline
  • a media is generally delivered via a tube to a target site for clearing debris.
  • the delivered media together with the debris are then removed from the target site via a separate tube (i.e., the media and the debris are aspirated into a vacuum port of the tube).
  • the delivery cannula must be made large enough to accommodate the tissue removal probe and tubes.
  • the incision through which the cannula is to be introduced must be made relatively large, thereby unnecessarily causing more tissue trauma.
  • a tissue removal probe is provided.
  • the tissue removal probe particularly lends itself to the removal of soft tissue, such as that contained in intervertebral discs and the cancellous bone in vertebral bodies, but can be used to remove other types of tissue as well.
  • the tissue removal probe comprises an elongated member (such as a sleeve) having a lumen and a pre-curved flexible distal end, a drive shaft rotatably disposed within the member lumen, and a rotatably tissue removal element (e.g., an abrasive burr) disposed on the drive shaft adjacent the member distal end.
  • the member distal end can be pre-curved at approximately ninety degrees, although other curvatures are possible.
  • the pre-curved member distal end may associate the tissue removal element, which has its own axis of rotation, with a radius of revolution about the longitudinal axis of the member.
  • the member is laterally flexible and resilient, so that the radius of revolution can be adjusted.
  • the probe may optionally comprise a proximal adapter mounted to the member for mating with a drive unit.
  • the tissue removal kit comprises a cannula, which may be rigid, e.g., so that it can be introduced through tissue without the aid of other instruments.
  • the cannula may have a tissue-penetrating distal tip to facilitate its introduction harder tissue, such as bone tissue.
  • the tissue removal kit further comprises a tissue removal probe axially slidable within the cannula lumen.
  • the tissue removal probe may optionally be removable from the cannula lumen, so that the cannula can be used for other functions, e.g., delivering therapeutic media.
  • the tissue removal probe comprises an elongated member having a lumen and a distal end configured to curve when distally deployed from the cannula lumen.
  • the deployed member distal end can be configured to curve in any one of a variety of manners.
  • the distal end of the cannula may be curved, the member distal end may be pre-curved, or pull wire(s) can be provided to actively bend the member distal end.
  • the member distal end can be curved at approximately ninety degrees, although other curvatures are possible.
  • the tissue removal probe further comprises a drive shaft rotatably disposed within the member lumen, and a rotatable tissue removal element (e.g., an abrasive burr) disposed on the drive shaft adjacent the member distal end.
  • a rotatable tissue removal element e.g., an abrasive burr
  • the curved member distal end may associate the tissue removal element, which has its own axis of rotation, with a radius of revolution about the longitudinal axis of the straight portion of the member.
  • the member is laterally flexible and resilient, so that the radius of revolution can be adjusted.
  • the probe may optionally comprise a proximal adapter mounted to the member for mating with a drive unit.
  • a method of removing tissue from an anatomical body comprises introducing a cannula into the anatomical body at a first location, and introducing a tissue removal probe through the cannula.
  • the tissue removal probe may be introduced into the cannula prior or subsequent to the introduction of the cannula into the anatomical body.
  • the tissue removal probe comprises an elongated member having a straight portion and a distal end, and a distally located tissue removal element associated with the member distal end.
  • the method further comprises displacing the tissue removal element a first distance from the cannula, wherein the distal end bends to associate the tissue removal element with a first radius of revolution about a rotational axis of the straight portion of the member.
  • the member distal end bends because it is pre-curved or the cannula distal end is curved.
  • the method further comprises rotating the member around its rotational axis, wherein the tissue removal element scribes a first arc defined by the first radius of revolution.
  • the first arc forms an entire circle.
  • the method further comprises rotating the tissue removal element about its axis of rotation to remove tissue at at least two points along the first arc.
  • the tissue removal element may be rotated while the straight member portion is rotated, so that the tissue removal element continuously removes tissue along the first arc.
  • the method may comprise displacing the tissue removal element a second distance from the cannula, wherein the distal end bends to associate the tissue removal element with a second radius of revolution different from the first radius of revolution.
  • the method may further comprise rotating the straight member portion around the first axis of rotation, wherein the tissue removal element scribes a second arc defined by the second radius of revolution (which may be greater than the first radius of revolution), and rotating the tissue removal element about the second axis of rotation to remove tissue at at least two points along the second arc.
  • the second arc may also form an entire circle. In this case, a solid disc of tissue may be removed.
  • the method may optionally comprise displacing the cannula along the first axis of rotation to a second location, and repeating the member distal end displacement, straight member portion rotation, and tissue removal element rotation steps.
  • a solid cylinder of tissue is removed if the first and second arcs are entire circles.
  • another method of removing tissue from an anatomical body e.g., an intervertebral disc or vertebral body
  • the method comprises introducing a cannula into the anatomical body at a first location, and introducing a tissue removal probe through the cannula.
  • the tissue removal probe may be introduced into the cannula prior or subsequent to the introduction of the cannula into the anatomical body.
  • the tissue removal probe comprises an elongated member having a distal end, and a distally located tissue removal element associated with the member distal end.
  • the method further comprises displacing the tissue removal element a first distance from the cannula to associate the tissue removal element with a first radius of curvature.
  • the method further comprises bending the member distal end, wherein the tissue removal element scribes a first arc defined by the first radius of curvature.
  • the member distal end can be actively bent using at least one pull wire.
  • the first arc forms a semi-circle.
  • the method further comprises rotating the tissue removal element about its axis of rotation to remove tissue at at least two points along the first arc.
  • the tissue removal element may be rotated while the member distal end is bent, so that the tissue removal element continuously removes tissue along the first arc.
  • the method may comprise displacing the tissue removal element a second distance from the cannula to associate the tissue removal element with a second radius of curvature different from the first radius of curvature.
  • the method may further comprise bending the member distal end, wherein the tissue removal element scribes a second arc defined by the second radius of curvature (which may be greater than the first radius of curvature), and rotating the tissue removal element about its axis of rotation to remove tissue at at least two points along the second arc.
  • the second arc may also form a semi-circle. In this case, a solid sector of tissue may be removed.
  • FIG. 1 is a perspective view of a portion of a spine
  • FIG. 2 is a top view of a vertebra with a healthy intervertebral disc
  • FIG. 3 is a top view of a vertebra with a herniated intervertebral disc
  • FIG. 4 is a top view of a vertebra with spinal stenosis
  • FIG. 5 is a prior art tissue removal probe
  • FIG. 6 is another prior art tissue removal probe
  • FIG. 7 is a plan view showing tissue removal using the tissue removal probe of FIG. 6 ;
  • FIG. 8 is a perspective view of a tissue removal system arranged in accordance with a preferred embodiment of the present invention.
  • FIG. 9 is perspective view of a tissue removal probe that can be used in the system of FIG. 8 ;
  • FIG. 10 is a partially cutaway side view of the distal end of the probe of FIG. 9 , particularly showing the tissue removal element retracted within the probe shaft;
  • FIG. 11 is a partially cutaway side view of the distal end of the probe of FIG. 9 , particularly showing the tissue removal element partially deployed from the probe shaft;
  • FIG. 12 is a partially cutaway side view of the distal end of the probe of FIG. 9 , particularly showing the tissue removal element fully deployed from the probe shaft;
  • FIG. 13 is a perspective view of a variation of the probe of FIG. 9 , particularly showing irrigation and aspiration lumens;
  • FIGS. 14A-14G are perspective views showing a method of using the tissue removal system of FIG. 8 to remove tissue within a herniated intervertebral disc;
  • FIG. 15 is a partially cutaway side view of the distal end of another tissue removal probe that can be used in the tissue removal system of FIG. 8 , particularly showing the tissue removal element retracted within the probe shaft;
  • FIG. 16 is a partially cutaway side view of the distal end of the probe of FIG. 15 , particularly showing the tissue removal element partially deployed from the probe shaft;
  • FIG. 17 is a partially cutaway side view of the distal end of the probe of FIG. 15 , particularly showing the tissue removal element fully deployed from the probe shaft;
  • FIG. 18 is perspective view of still another tissue removal probe that can be used in the system of FIG. 8 ;
  • FIG. 19 is a partially cut-away side view of the distal end of the probe of FIG. 18 , particularly showing a tissue removal element;
  • FIG. 20 is a partially cut-away side view of a variation of the distal end of the probe of FIG. 18 , particularly showing a variation of the tissue removal element;
  • FIG. 21 is perspective view of yet another tissue removal probe that can be used in the system of FIG. 8 ;
  • FIGS. 22A-22D are side views of the distal end of the probe of FIG. 21 , particularly showing a transformation of the probe from a tissue-cutting device to a tissue-grasping device;
  • FIG. 23 is perspective view of yet another tissue removal probe that can be used in the system of FIG. 8 ;
  • FIG. 24 is a partially cut-away side view of the distal end of the probe of FIG. 23 ;
  • FIG. 25 is perspective view of yet another tissue removal probe that can be used in the system of FIG. 8 ;
  • FIG. 26 is a partially cut-away side view of the distal end of yet another tissue removal probe that can be used in the system of FIG. 8 ;
  • FIG. 27 is perspective view of yet another tissue removal probe that can be used in the system of FIG. 8 ;
  • FIG. 28 is a cross-sectional view of the probe of FIG. 27 , taken along the line 28 - 28 ;
  • FIG. 29 is perspective view of yet another tissue removal probe that can be used in the system of FIG. 8 ;
  • FIG. 30 is a partially cutaway side view of the distal end of still another tissue removal probe that can be used in the tissue removal system of FIG. 8 , particularly showing the tissue removal element retracted within the probe shaft;
  • FIG. 31 is a cross-sectional view of the distal end of the tissue removal probe of FIG. 30 , taken along the line 31 - 31 ;
  • FIG. 32 is a partially cutaway side view of the distal end of the probe of FIG. 30 , particularly showing the tissue removal element partially deployed from the probe shaft;
  • FIG. 33 is a partially cutaway side view of the distal end of the probe of FIG. 30 , particularly showing the tissue removal element fully deployed from the probe shaft;
  • FIGS. 34A-34D are perspective views showing a method of using the tissue removal system of FIG. 8 , with the tissue removal probe of FIG. 30 , to remove tissue within a herniated intervertebral disc.
  • FIG. 8 illustrates a tissue removal system 100 constructed in accordance with a preferred embodiment of the present inventions.
  • the system 100 generally comprises a tissue removal probe assembly 102 and a rotary drive unit 104 connected to the probe assembly 102 via a drive cable 106 .
  • the drive unit 104 may take the form of a standard rotary drive used for powering medical cutting instruments.
  • the tissue removal probe assembly 102 comprises a cannula 108 and a tissue removal probe 110 disposed therein.
  • the cannula 108 comprises a shaft 112 having a distal end 114 and proximal end 116 , a lumen 118 (shown in phantom) terminating in an exit port 120 at the distal end 114 of the cannula shaft 112 , and a handle 122 mounted on the proximal end 116 of the cannula shaft 112 .
  • the cannula shaft 112 is preferably stiff (e.g., it can be composed of a stiff material, or reinforced with a coating or a coil to control the amount of flexing), so that the cannula shaft 112 can penetrate the tissue without being damaged.
  • the materials used in constructing the cannula shaft 112 may comprise any of a wide variety of biocompatible materials.
  • a radiopaque material such as metal (e.g., stainless steel, titanium alloys, or cobalt alloys) or a polymer (e.g., ultra high molecular weight polyethylene) may be used, as is well known in the art.
  • the cannula shaft 112 may be flexible.
  • the handle 122 is preferably composed of a durable and rigid material, such as medical grade plastic, and is ergonomically molded to allow a physician to more easily manipulate the cannula 108 .
  • the outer diameter of the cannula shaft 112 is preferably less than 1 ⁇ 2 inch, but other dimensions for the outer diameter of the cannula shaft 112 may also be appropriate, depending on the particular application or clinical procedure.
  • the cannula lumen 118 should have an inner diameter so as to allow the tissue removal probe 110 to be slidably housed therein, as will be described in further detail below.
  • the profile of the cannula lumen 118 is circular, but can be other shapes as well.
  • the distal tip of the cannula shaft 112 is blunt.
  • the thickness and cross-sectional profile of the cannula shaft 112 is small enough, so that the distal tip can be used as a cutting or deforming tool for boring or coring through tissue.
  • the distal tip of the cannula shaft 112 may be advantageously sharpened or wedged to facilitate its introduction into bone structure.
  • a stilette (not shown) can be introduced through the cannula lumen 118 to provide an independent means for boring through bone structure. In this manner, bone cores will not block the cannula lumen 118 , which may otherwise prevent, or at least make difficult, deployment of the tissue removal probe 110 and other therapeutic materials.
  • the tissue removal probe 110 comprises a sleeve 124 having a distal end 126 and a proximal end 128 , and a lumen 130 (shown in phantom) extending through the sleeve 124 .
  • the tissue removal probe 110 further comprises a drive shaft 132 rotatably disposed within the sleeve lumen 130 and a rotatable tissue removal element, and in particular, an abrasive burr 134 , mounted to the distal end of the drive shaft 132 .
  • the burr 134 has a pattern of cutting edges 136 that facilitate removal of tissue that comes in contact with the rotating burr 134 .
  • the burr 134 is fully exposed in that it entirely resides outside of the sleeve 124 .
  • the burr 134 may be seated within the distal end of a sheath, and exposed through a window cutout from the distal end of the sheath.
  • Other types of tissue-cutting element can also be used in place of the burr 134 . Examples of other tissue-cutting elements will subsequently be described.
  • the tissue removal probe 110 further comprises a proximal adapter 138 mounted to the proximal end 128 of the sleeve 124 .
  • the proximal adapter 138 is configured to be mated with the drive cable 106 , thereby providing a means for rotatably coupling the drive unit 104 to the proximal end of the drive shaft 132 .
  • operation of the drive unit 104 will rotate the drive shaft 132 , which in turn, will rotate the burr 134 about its rotational axis 140 .
  • the tissue removal probe 110 is rotatably disposed within the cannula lumen 118 , such that the sleeve 124 (and in particular, the straight portion of the sleeve) has an axis of rotation 142 (i.e., the sleeve 124 can be rotated about the rotational axis 142 , e.g., when the proximal end 128 of sleeve distal end 126 is manually rotated).
  • the rotational axes 140 and 142 of the respective burr 132 and sleeve 124 are coincident with each other when the entirety of the sleeve 124 is straight.
  • the rotational axes 140 and 142 will diverge from each other when the distal end 126 of the sleeve 124 is curved or bent.
  • the tissue removal probe 110 is slidably disposed in the cannula lumen 118 in the longitudinal direction, so that the burr 134 can be incrementally deployed from the exit port 120 of the cannula shaft 112 and retracted within the distal end 114 of the cannula shaft 112 .
  • the sleeve 124 when confined within the cannula lumen 118 , the sleeve 124 assumes a substantially straight configuration and conforms to the shape of the cannula shaft 112 .
  • the distal end 126 of the sleeve 124 when in its relaxed state, has a pre-shaped curved portion 144 and a pre-shaped straight portion 146 distal to the curved portion 144 .
  • the curved portion 144 defines an arc of ninety-degrees. It should be noted, however, the curved portion 144 may define other arcs.
  • the sleeve 124 is composed of a laterally flexible, yet resilient, material, such as nitinol.
  • the drive shaft 132 is also laterally flexible, and thus easily conforms to the curved geometry of the deployed sleeve distal end 126 . In this manner, the burr 134 will rotate about its rotational axis 140 even if the drive shaft 132 is bent.
  • the distal end 126 of the sleeve 124 can be deployed from the cannula exit port 120 in stages.
  • the sleeve distal end 126 can be deployed a first distance from the distal end 114 of the cannula shaft 112 , so that the burr 134 defines a particular radius of revolution r 1 (shown in FIG. 11 ) around the rotational axis 142 of the sleeve 124 .
  • the sleeve distal end 126 can be deployed a second greater distance from the distal end 126 of the cannula shaft 112 , so that the burr 134 defines a second greater radius of revolution r 2 (shown in FIG.
  • radius of revolution r of the burr 134 can be adjusted simply by displacing the sleeve 124 within the cannula lumen 118 .
  • the tissue removal probe 110 can optionally have irrigation and aspiration capability.
  • the sleeve 124 in addition to having the lumen 130 through which the drive shaft 132 extends, includes irrigation and aspiration lumens 148 and 150 (shown in phantom).
  • the irrigation lumen 148 terminates at an irrigation outlet port 152 in the sleeve distal end 126 and proximally terminates at an irrigation inlet port (not shown) in the proximal adapter 138 .
  • the aspiration lumen 150 terminates at an aspiration entry port 154 in the sleeve distal end 126 and proximally terminates at an aspiration outlet port (not shown) in the proximal adapter 138 .
  • irrigation and/or aspiration ports can be placed in the burr 134 .
  • a pump (not shown) can be connected to the irrigation inlet port on the proximal adapter 138 in order to flush irrigation fluid, such as saline, through the irrigation lumen 148 and out the irrigation outlet port 152 .
  • the irrigation fluid helps cool the drive shaft 132 and/or the burr 134 , while the burr 134 is rotating at high speed and grinding against tissue. The media also washes away debris at the target site.
  • a vacuum (not shown) can be connected to the aspiration outlet port on the proximal adapter 138 in order to aspirate the removed tissue into the aspiration inlet port 154 , through the aspiration lumen 150 , and out of the aspiration outlet port. Because there are separate irrigation and aspiration lumens 148 and 150 , both the pump and aspirator can be activated simultaneously or separately.
  • tissue removal system 100 its operation will now be described with reference to FIGS. 14A-14G , in removing soft tissue from an anatomical body, and in particular, in performing a discectomy on a herniated intervertebral disc. It should be noted, however, that other tissue, such as the cancellous tissue within a vertebral body, could also be removed by the tissue removal system 100 .
  • the cannula 108 is introduced through a small incision 41 in the back 39 and into the herniated disc 12 ′ ( FIG. 14A ).
  • a laminectomy may have to be performed to access the disc 12 ′.
  • the cannula 108 may be used to bore through the lamina (not shown).
  • Torsional and/or axial motion may be applied to the cannula 108 to facilitate boring of the lamina.
  • the torsional and/or axial motion may be applied manually or mechanically (i.e., by a machine).
  • An object, such as a hammer or a plunger may also be used to tap against the handle 122 of the cannula 108 in order to facilitate boring through the lamina.
  • a stilette (not shown) can be introduced through the cannula lumen (not shown in FIG. 14A ) to create a passage through the lamina.
  • a separate drill or bone cutting device such as those described below, can be used to bore or cut a passage through the lamina prior to placement of the cannula 108 .
  • the cannula 108 is introduced into the disc 12 ′, such that its distal tip is placed adjacent the distal-most region of the target tissue. In this case, distal to the herniation 46 .
  • the tissue removal probe 110 is introduced through the cannula lumen 118 until the distal end 126 of the sleeve 124 deploys out from exit port 120 of the cannula shaft 112 a first distance ( FIG. 14B ), which as described above, associates the burr 134 with a first radius of revolution r 1 around the rotational axis 142 of the sleeve 124 .
  • the tissue removal probe 110 can either be introduced into the cannula lumen 118 prior to introduction of the cannula 108 into the patient's back (in which case, the tissue removal probe 110 will be fully retracted within the cannula lumen 118 during introduction of the cannula 108 ) or can be introduced into the cannula lumen 118 after the cannula 108 has been introduced into, and properly positioned, within the disc 12 ′.
  • the proximal adapter 138 of the tissue removal probe 110 is mated to the drive unit (shown in FIG. 8 ), which is then operated to rotate the burr 134 about is own rotational axis 140 .
  • the sleeve 124 is manually rotated (e.g., by rotating the proximal adapter 138 ), which causes the burr 134 to scribe an arc a 1 around the rotational axis 142 of the sleeve 124 ( FIG. 14C ).
  • tissue is removed by the rotating burr 134 along the arc a 1 .
  • the sleeve 124 is rotated until the burr 134 scribes an entire circle around the rotational axis 142 of the sleeve 124 . In this manner, a full circle of tissue is removed by the burr 134 .
  • the radius of revolution of the burr 134 is so short that both on-axis and off-axis tissue is essentially removed. In effect, the burr 134 removes a small disc of tissue at this point.
  • the removed tissue could be aspirated from the herniated disc 12 ′ using an aspirator. Aspiration of the tissue can be accomplished via the cannula or through another cannula. Alternatively, as previously described, aspiration can be accomplished via the tissue removal probe 110 , itself.
  • the tissue removal probe 110 is further introduced through the cannula lumen 118 until the distal end 126 of the sleeve 124 deploys out from the exit port 120 of the cannula shaft 112 a second greater distance ( FIG. 14D ), which as described above, associates the burr 134 with a second greater radius of revolution r 2 around the rotational axis 142 of the sleeve 124 .
  • the drive unit 104 is operated to rotate the burr 134 about is own rotational axis 140 , while manually rotating the sleeve 124 , which causes the burr 134 to scribe another larger arc a 2 around the rotational axis 142 of the sleeve 124 ( FIG. 14E ).
  • a ring of tissue is removed by the rotating burr 134 along the larger arc a 2 .
  • the sleeve 124 is rotated until the burr 134 scribes an entire circle around the rotational axis 142 of the sleeve 124 .
  • a full circle of tissue is removed by the burr 134 .
  • the difference between the first and second radii and of revolution r 1 and r 2 is such that the disc of tissue removed by the burr 134 along the first arc a 1 is coextensive with the ring of tissue removed by the burr 134 along the second arc a 2 .
  • the steps illustrated in FIGS. 14D and 14E can be repeated to remove even larger discs of tissue.
  • the cannula 108 is displaced in the proximal direction, and the tissue removal probe 110 is retracted, so that the sleeve distal end 126 deploys out from the exit port 120 of the cannula shaft 112 the first distance ( FIG. 14F ).
  • the steps illustrated in FIGS. 14B-14E are then repeated to remove another disc of tissue ( FIG. 14G ).
  • the proximal displacement of the cannula 108 is such that the first and second discs of removed tissue are contiguous. As such, a cylinder of tissue is removed. A longer cylinder of tissue can be removed by repeating the steps illustrated in FIGS. 14F and 14G .
  • the cannula 108 is removed from the patient's body.
  • the tissue removal probe 110 can be removed, and a therapeutic media, such as a drug or disc replacement material can be delivered through the cannula lumen 118 into the disc 12 ′.
  • FIGS. 15-17 illustrate a tissue removal assembly 202 that bends a deploying sleeve using the cannula, itself.
  • the tissue removal assembly 202 comprises a cannula 208 , which is similar to the previously described cannula 108 , with the exception that it comprises a cannula shaft 212 with a curved distal end 214 .
  • the distal end 214 of the cannula 208 assumes a ninety-degree curve.
  • the tissue removal assembly 202 comprises a tissue removal probe 210 that is similar to the previously described tissue removal probe 110 , with the exception that it comprises a sleeve 224 that does not have a pre-curved distal end. Instead, the entire sleeve 224 is configured to assume a straight configuration in its relaxed state.
  • the sleeve 224 assumes a substantially straight configuration and conforms to the shape of the cannula shaft 212 .
  • the distal end 226 of the sleeve 224 bends when deployed from the distal end of the cannula shaft 112 . That is, as it is deployed, the sleeve distal end 226 contacts the inner surface of the curved cannula distal end 214 , thereby deflecting the sleeve distal end 226 as its exits the cannula lumen 218 .
  • the sleeve is laterally resilient, such that it maintains its shape as it deploys from the exit port 220 at the distal end 214 of the cannula shaft 212 .
  • the sleeve distal end 226 can be deployed from the exit port 220 of the cannula shaft 212 in stages.
  • the sleeve distal end 226 can be deployed a particular distance from exit port 220 , so that the burr 134 defines a particular radius of revolution r 1 (shown in FIG. 16 ) around the rotational axis 242 of the sleeve 224 .
  • the sleeve distal end 226 can be deployed a second greater distance from the exit port 220 , so that the burr 134 defines a second greater particular radius of revolution r 2 (shown in FIG.
  • radius of revolution r of the burr 134 can be adjusted simply by displacing the sleeve 224 within the cannula lumen 218 .
  • tissue removal assembly 202 in removing soft tissue is similar to the operation of the previously described tissue removal assembly 102 , and will thus, not be further described.
  • FIGS. 30-33 illustrate a tissue removal assembly 252 that has a sleeve with steering functionality.
  • the tissue removal assembly 252 comprises the previously described cannula 108 , and a tissue removal probe 260 that is similar to the previously described tissue removal probe 110 , with the exception that it does not have a pre-curved distal end, but instead, comprises a pair of pull wires 254 (shown in FIG. 31 ) extending through a respective pair of pull wire lumens 256 contained within the sleeve 124 .
  • the distal ends of the pull wires 254 are mounted to the distal tip of the sleeve 124 in a suitable manner. As can be seen from FIG.
  • the sleeve 124 when confined within the cannula lumen 218 , the sleeve 124 assumes a substantially straight configuration and conforms to the shape of the cannula shaft 112 . As can be seen from FIGS. 32 and 33 , the distal end 126 of the sleeve 124 , when deployed from the exit port 120 of the cannula shaft 112 , bends in one direction when one of the pull wires 254 is pulled.
  • the sleeve distal end 126 can be deployed from the exit port 120 of the cannula shaft 112 in stages.
  • the sleeve distal end 126 can be deployed a first distance from exit port 120 and one of the pull wires 254 pulled to bend the sleeve distal end 126 , so that the burr 134 defines a particular radius of revolution r 1 (shown in FIG. 32 ) around the rotational axis 142 of the sleeve 124 .
  • the sleeve distal end 126 can be deployed a second greater distance from the exit port 120 and the pull wire 254 pulled to bend the sleeve distal end 126 again, so that the burr 134 defines a second greater particular radius of revolution r 2 (shown in FIG. 33 ) around the rotational axis 142 of the sleeve 124 .
  • radius of revolution r of the burr 134 can be adjusted simply by displacing the sleeve 124 within the cannula lumen 118 and pulling one of the pull wires 254 to bend the sleeve distal end 126 .
  • tissue removal assembly 252 in removing soft tissue is similar to the operation of the previously described tissue removal assembly 102 , with the exception that the pull wires 254 are used to actively bend the distal end 126 of the sheath 124 .
  • the tissue removal assembly 252 may be used in a different manner to remove soft tissue from an anatomical body, and in particular, in performing a discectomy on a herniated intervertebral disc.
  • This alternative method is accomplished by bending the distal end 126 of the sleeve 124 in opposite directions using the pull wires 254 , while rotating the burr 134 , thereby removing tissue in an arc that is coplanar with the plane of the axis 142 . In this case, a layer of tissue is removed in a plane that is parallel with the flat sides of the herniated disc.
  • the tissue removal probe 260 is introduced through the cannula lumen 118 until the distal end 126 of the sleeve 124 deploys out from exit port 120 of the cannula shaft 112 a first distance ( FIG. 34A ), which associates the burr 134 with a first radius of curvature r 1 (shown in FIG. 34B ).
  • the proximal adapter 138 of the tissue removal probe 210 is mated to the drive unit (shown in FIG. 8 ), which is then operated to rotate the burr 134 about is own rotational axis 140 .
  • the distal end 126 of the sleeve 124 is bent in one direction by pulling one of the pull wires 254 (shown in FIG. 34A ), which causes the rotating burr 134 to scribe a ninety degree arc a 1 (as measured from the longitudinal axis 142 ) around the distal tip of the sleeve 124 ( FIG. 34B ).
  • the distal end 126 of the sleeve 124 is bent in the opposite direction by pulling the other pull wire 254 , which causes the rotating burr 134 to scribe a one hundred eighty degree arc a 1 (ninety degrees above the longitudinal axis 142 and ninety degrees below the longitudinal axis 142 ) around the distal tip of the sleeve 124 (shown in phantom in FIG. 34B ).
  • a semi-circle of tissue is removed by the burr 134 .
  • the radius of curvature of the burr 134 is so short that a solid radial sector of tissue is removed.
  • the remove tissue can optionally be aspirated.
  • the tissue removal probe 210 is further introduced through the cannula lumen 118 until the distal end 126 of the sleeve 124 deploys out from the exit port 120 of the cannula shaft 112 a second greater distance ( FIG. 34C ), which associates the burr 134 with a second greater radius of curvature r 2 (shown in FIG. 34D ).
  • the drive unit 104 is operated to rotate the burr 134 about is own rotational axis 140 , while bending the distal end 126 of the sleeve 124 in one direction using the first pull wire 254 (shown in FIG.
  • the difference between the first and second radii and of curvature r 1 and r 2 is such that the radial sector of tissue removed by the burr 134 along the first arc a 1 is coextensive with the semi-circular ring of tissue removed by the burr 134 along the second arc c 2 .
  • the steps illustrated in FIGS. 34C and 34D can be repeated to remove even larger discs of tissue.
  • the cannula 108 is removed from the patient's body.
  • the tissue removal probe 260 can be removed, and a therapeutic media, such as a drug or disc replacement material can be delivered through the cannula lumen 118 into the disc 12 ′.
  • the tissue removal probe 310 comprises a sleeve 324 having a distal end 326 and a proximal end 328 , and a lumen 330 (shown in phantom in FIG. 18 ) extending through the sleeve 324 .
  • the tissue removal probe 310 further comprises a drive shaft 332 rotatably disposed within the sleeve lumen 330 and a rotatable tissue removal element, and in particular, a rotatable cutting basket 334 , mounted to the distal end of the drive shaft 332 .
  • the tissue removal probe 310 further comprises a proximal adapter 338 mounted to the proximal end 328 of the sleeve 324 .
  • the proximal adapter 338 is configured to be mated with the drive cable 106 , thereby providing a means for rotatably coupling the drive unit 104 to the proximal end of the drive shaft 332 .
  • operation of the drive unit 104 will rotate the drive shaft 332 , which, in turn, will rotate the cutting basket 334 about its rotational axis 340 .
  • the tissue removal probe 310 can be rotatably disposed within the lumen 118 of the cannula 108 , so that the cutting basket 334 can be alternately deployed from and retracted into the distal end 114 of the cannula shaft 112 .
  • the cutting basket 334 comprises a base member 344 , a distal hub 346 , and a plurality of filaments 348 proximally affixed to the base member 344 and distally affixed to the distal hub 346 .
  • the base member 344 is mounted to the distal end of the drive shaft 332 using suitable means, such as soldering or welding.
  • the distal hub 346 is preferably rounded, such that only lateral tissue removal is achieved, and inadvertent tissue trauma distal to the cutting basket 334 is prevented.
  • the shape of the filaments 348 is sinusoidal, although other shapes can be provided. Although three filaments 348 are shown, the cutting basket 334 may include a different number of filaments 348 .
  • the filaments 348 are also interlaced or braided to provide the cutting basket 334 with a more integral structure.
  • the filaments 348 can be configured differently.
  • FIG. 20 illustrates an alternative cutting basket 354 , wherein the filaments 348 , the proximal and distal ends of which are mounted to the base member 344 , thereby affixing the filaments 348 at the proximal end of the cutting basket 334 .
  • the filaments 348 are affixed at the distal end of the cutting basket 334 by looping the filaments 348 through the distal hub 346 .
  • each filament 348 can be circular, rectangular, elliptical, or other customized shapes. As can be appreciated, the large spaces between the filaments 348 prevent, or at the least minimize, the build-up of tissue on the cutting basket 334 .
  • the filaments 348 are preferably made from a tough material, such as steel or other alloys, so that it could penetrate or cut into a bone structure without being damaged.
  • the stiffness of the filaments 348 are preferably selected so that the cutting basket 334 is stiff enough to cut, deform, and/or compact target bone tissue. In the case where soft tissue is to be removed, the filaments 348 may likewise be composed of a soft material.
  • the material from which the filaments 348 are made are resilient, such that cutting basket 334 assumes a low profile while residing within the cannula lumen 330 , and is free to assume an expanded profile when deployed outside of the cannula lumen 330 .
  • the cutting basket 334 is 1 cm in length and 1 ⁇ 2 cm in diameter.
  • the filaments 348 have sharp edges, thereby providing bone, disc or soft tissue cutting/drilling capability.
  • the cutting basket 334 includes abrasive particles, such as diamond dusts, disposed on surfaces of the filaments 348 , for cutting, digging, and/or sanding against target bone, disc or soft tissue.
  • the filaments 348 are connected between the base member 344 and distal hub 346 and drive shaft 332 using means, such as a welding, brazing, or glue, depending on the materials from which the distal hub, filaments, and drive shaft 332 are made.
  • the filaments 348 are connected between the distal hub 346 and drive shaft 332 by a snap-fit connection, a screw connection, or otherwise an interference-fit connection.
  • the tissue ablation probe 310 optionally comprises a guidewire 352 that extends through a lumen 353 (shown in phantom) within the drive shaft 332 , and is mounted to the distal hub 346 of the cutting basket 334 . In this manner, the lateral movement of the cutting basket 334 during operation is limited.
  • tissue removal probe 410 that can alternatively be used in the tissue removal system 100 will be described.
  • the tissue removal probe 410 is similar to the previously described tissue removal probe 310 in that it comprises the sleeve 324 , drive shaft 332 , and proximal adapter 338 .
  • the tissue removal probe 410 differs from the tissue removal probe 310 in that it comprises a tissue removal device, and in particular, a cutting basket, that can be transformed between a tissue-cutting device and a tissue grasper.
  • the cutting basket 434 comprises a base member 444 , a distal hub 446 , and a plurality of filaments 448 proximally affixed to the base member 444 and distally affixed to the distal hub 446 .
  • the base member 444 is mounted to the distal end of the drive shaft 332 using suitable means, such as soldering or welding.
  • the distal hub 446 is preferably rounded, such that only lateral tissue removal is achieved, and inadvertent tissue trauma distal to the cutting basket 434 is prevented.
  • the filaments 448 may have the same composition as the previously described filaments 448 .
  • Each filament 448 has a hinge point 450 that divides the filament 448 into a proximal filament segment 452 and a distal filament segment 454 .
  • pulling the distal hub 446 in the proximal direction causes the distal end of the cutting basket 434 to invert into the proximal end of the cutting basket 434 . That is, the distal filament segments 454 fold around the hinge points 450 towards the proximal filament segments 452 , transforming the folded filaments 448 into tissue-grasping arms, with the hinge points 450 forming the most distal points of the arms.
  • the hinge points 450 are located distal to the midpoints of the filaments 448 (i.e., the distal filament segments 454 are shorter than the proximal filament segments 452 ). In this manner, the resulting tissue-grasping arms are relatively short, and therefore have a greater resistance to lateral bending when grasping tissue.
  • the actuating device takes the form of a pull wire 456 that extends through the lumen 353 in the drive shaft 332 , attaching to the distal hub 446 .
  • the cutting basket 434 is transformed from a tissue-cutting device to a tissue-grasping device.
  • the tissue-grasping device due to its resiliency
  • the distal filament segments 454 will fold back around the hinge points 450 away from the proximal filament segments 452 , transforming the filaments 448 into tissue-cutting filaments.
  • tissue removal probe 510 that can alternatively be used in the tissue removal system 100 will be described.
  • the tissue removal probe 510 is similar to the previously described tissue removal probe 310 in that it comprises the sleeve 324 and proximal adapter 338 .
  • the tissue removal probe 510 differs from the tissue removal probe 310 in that it has tissue irrigating functionality and minimizes inadvertent trauma to distal tissue, otherwise caused by a tissue removal element 534 .
  • the tissue removal probe 510 comprises a drive shaft 532 , which is composed of a rigid material, such as stainless steel, and has a distal end with a non-traumatic blunt tip 536 .
  • the blunt tip 536 prevents the tissue removal element 534 from abrading or harming distal tissue during use.
  • the blunt tip 536 has a spherical shape. In alternative embodiments, however, the blunt tip 536 can have other shapes as well.
  • the drive shaft 332 further comprises an irrigation lumen 538 (shown in phantom) that terminates in an irrigation port 540 at the blunt tip 536 .
  • irrigation fluid can be delivered through the irrigation lumen 538 and out of the irrigation port 540 in order to cool the drive shaft 332 and/or tissue removal element 534 , as well as to wash debris at the target site.
  • the irrigation lumen 538 can alternatively be used as a guidewire lumen.
  • the tissue removal element 534 is formed on the distal end of the drive shaft 332 just proximal to the blunt tip 536 .
  • the tissue removal device 534 comprises an ellipsoidal burr, although other geometrically shaped burrs can be used. Unlike a cutting basket, the cross-section of the burr 534 is relatively more solid, thereby providing more stiffness. Such configuration is advantageous in that it allows cutting and/or abrading of stiff materials without deforming.
  • the burr 534 includes abrasive particles, such as diamond dusts, that are disposed on the surface of the burr 534 . In other embodiments, instead of having diamond dusts, parts of the surface of the burr 534 can be removed to create an abrasive surface.
  • the burr 534 further comprises a spiral cutting groove 542 . During use, the groove 542 allows bone particles that have been removed to travel proximally and away from a target site.
  • tissue removal probe 610 that can alternatively be used in the tissue removal system 100 will be described.
  • the tissue removal probe 610 is similar to the previously described tissue removal probe 310 in that it comprises the sleeve 324 , drive shaft 332 , and proximal adapter 338 .
  • the tissue removal probe 610 differs from the tissue removal probe 310 in that it comprises a tissue removal element 634 with counter-pitched grooves.
  • the tissue removal element 634 is mounted to the distal end of the drive shaft 332 , and takes the form of a cylindrically-shaped burr with proximal spiral cutting grooves 636 and distal spiral cutting grooves 638 .
  • the respective proximal and distal grooves 636 and 638 are oppositely pitched, such the removed tissue is force to travel along the grooves 636 / 638 towards the center of the burr 634 when rotated in a particular direction (in this case, clockwise if looking down the distal end of the burr 634 ). In this manner, the removed tissue will tend to be collected in one place, thereby making aspiration of the tissue easier.
  • tissue removal probe 710 that can alternatively be used in the tissue removal system 100 will be described.
  • the tissue removal probe 710 is similar to the previously described tissue removal probe 610 with the exception that two counter-rotating burrs are used.
  • the tissue removal probe 710 comprises an outer drive shaft 732 with a lumen 736 , and an inner drive shaft 733 disposed within the outer drive shaft lumen 736 .
  • the drive shafts 732 and 733 are independent, and can thus be rotated in opposite directions or the same direction.
  • the tissue removal probe 710 further comprises proximal and distal removal elements 734 and 735 in the form of cylindrical burrs mounted to the distal ends of the respective drive shafts 732 and 733 .
  • the cylindrical burrs 734 and 735 are collinear and coextensive with each other, so that they can operate as a contiguous tissue removal device.
  • Spiral cutting grooves 738 and 740 are formed in the surfaces of the respective burrs 734 and 735
  • the absolute pitch of the spiral grooves 738 on the proximal burr 734 is the same as the absolute pitch on the distal burr 735 .
  • the grooves 738 / 740 are pitched in the opposite direction.
  • rotation of the proximal burr 734 in one direction by rotating the outer drive shaft 732 in that direction
  • rotation of the distal burr 735 in the opposite direction by rotating the inner drive shaft 733 in that direction
  • the burrs 734 / 735 can be rotated in the same direction, preferably in a direction that forces the removed tissue to travel along the grooves 738 / 740 of the respective burrs 734 / 735 towards the interface between the burrs 734 / 735 .
  • the removed tissue will tend to be collected in one place, thereby making it more easily aspirated.
  • the independence of the outer and inner drive shafts 732 / 733 allows the respective burrs 734 / 735 to be selectively rotated in opposite directions or rotated in the same direction.
  • tissue removal probe 810 that can alternatively be used in the tissue removal system 100 will be described.
  • the tissue removal probe 810 is similar to the previously described tissue removal probe 310 in that it comprises the sleeve 324 , drive shaft 332 , and proximal adapter 338 .
  • the tissue removal probe 810 differs from the tissue removal probe 310 in that it comprises a tissue removal element 834 configured to drill holes through bone, whereas the tissue removal element of the tissue removal probe 310 , as well as those subsequently described in tissue removal probes 410 , 510 , 610 , and 710 , lend itself well to the lateral removal of hard bone tissue, e.g., during laminectomy and laminotomy procedures.
  • the tissue removal element 834 takes the form of a drill bit mounted at the distal end of the drive shaft 332 .
  • the drill bit 834 has a sharp distal tip 836 that allows the rotating drill bit 834 to penetrate or shape bone tissue.
  • the drill bit 834 has a length that is between 1 ⁇ 4 and 1 inch, and a diameter that is between 1/100 and 1 ⁇ 2 inch.
  • the drill bit 834 includes two fluted cutting grooves 838 that extend down opposite sides of the drill bit 834 , as shown in FIG. 28 .
  • the tissue removal probe 910 comprises a reciprocating tissue removal element.
  • the tissue removal probe 910 comprises a rigid drive shaft 912 having a distal end 914 , and a tissue removal element 934 formed on the distal end 914 of the drive shaft 912 .
  • the tissue removal element 934 comprise a block 936 with a series of cascading tissue-cutting notches 938 longitudinally formed along the block 934 .
  • a series of sharp leading edges 940 are formed along the block 934 .
  • the block 936 has a rectangular cross-section.
  • tissue removal element 934 can be placed within a hole or groove in a bone, and reciprocatably moved to remove bone tissue from the bone, thereby enlarging the hole.
  • a motor can be configured to apply a hammering motion (i.e., a forward and rearward motion) to drive the shaft 912 .

Abstract

A tissue removal kit or assembly comprises a cannula and a tissue removal probe axially slidable within the cannula. The tissue removal probe comprises an elongated member a distal end configured to curve when distally deployed from the cannula. The tissue removal probe further comprises a drive shaft rotatably disposed within the member, and a rotatable tissue removal element (e.g., an abrasive burr) disposed on the drive shaft adjacent the member distal end. The curved member distal end may associate the tissue removal element, which has its own axis of rotation, with a radius of revolution about the longitudinal axis of the member. The member is laterally flexible and resilient, so that the radius of revolution can be adjusted. In this manner, the tissue removal element can remove tissue around an adjustable arc.

Description

    RELATED APPLICATIONS
  • This application is related to copending applications Ser. No. 10/______ (Attorney Docket No. 2024730-7038282001), Ser. No. 10/______ (Attorney Docket No. 2024730-7036842001) and Ser. No. 10/______ (Attorney Docket No. 2024730-7038292001), which is expressly incorporated herein by reference.
  • FIELD OF THE INVENTION
  • The field of the invention pertains to medical devices and methods for removing tissue, and in particular, vertebral bone and intervertebral disc tissue.
  • BACKGROUND OF THE INVENTION
  • The spinal column consists of thirty-three bones called vertebra, the first twenty-four vertebrae of which make up the cervical, thoracic, and lumbar regions of the spine and are separated from each other by “pads” of tough cartilage called “intervertebral discs,” which act as shock absorbers that provide flexibility, stability, and pain-free movement of the spine.
  • FIGS. 1 and 2 illustrate a portion of a healthy and normal spine, and specifically, two vertebra 10 and two intervertebral discs 12 (only one shown). The posterior of the vertebra 10 includes right and left transverse processes 14R, 14L, right and left superior articular processes 16R, 16L, and a spinous process 18. Muscles and ligaments that move and stabilize the vertebra 10 are connected to these structures. The vertebra 10 further includes a centrally located lamina 20 with right and left lamina 20R, 20L, that lie inbetween the spinous process 18 and the superior articular processes 16R, 16L. Right and left pedicles 22R, 22L are positioned anterior to the right and left transverse processes 14R, 14L, respectively. A vertebral arch 24 extends between the pedicles 22 and through the lamina 20. The anterior of the vertebra 10 includes a vertebral body 26, which joins the vertebral arch 24 at the pedicles 22. The vertebral body 26 includes an interior volume of reticulated, cancellous bone (not shown) enclosed by a compact cortical bone 30 around the exterior. The vertebral arch 24 and vertebral body 26 make up the spinal canal (i.e., the vertebral foramen 32), which is the opening through which the spinal cord 34 and epidural veins (not shown) pass. Nerve roots 36 laterally pass from the spinal cord 34 out through the neural foramen 38 at the side of the spinal canal formed between the pedicles 22. Structurally, the intervertebral disc 12 consists of two parts: an inner gel-like nucleus (nucleus pulposus) 40 located centrally within the disc 12, and tough fibrous outer annulus (annulus fibrosis) 42 surrounding the nucleus 40.
  • A person may develop any one of a variety of debilitating spinal conditions and diseases. For example, as illustrated in FIG. 3, when the outer wall of the disc 12′ (i.e., the annulus fibrosis 42) becomes weakened through age or injury, it may tear allowing the soft inner part of the disc 12 (i.e., the nucleus pulposus 40) to bulge out, forming a herniation 46. The herniated disc 12′ often pinches or compresses the adjacent dorsal root 36 against a portion of the vertebra 10, resulting in weakness, tingling, numbness, or pain in the back, legs or arm areas.
  • Often, inflammation from disc herniation can be treated successfully by nonsurgical means, such as bedrest, therapeutic exercise, oral anti-inflammatory medications or epidural injection of corticosterioids, and anesthetics. In some cases, however, the disc tissue is irreparably damaged, in which case, surgery is the best option.
  • Discectomy, which involves removing all, or a portion, of the affected disc, is the most common surgical treatment for ruptured or herniated discs of the lumbar spine. In most cases, a laminotomy or laminectomy is performed to visualize and access the affected disc. Once the vertebrae, disc, and other surrounding structures can be visualized, the surgeon will remove the section of the disc that is protruding from the disc wall and any other offending disc fragments that may have been expelled from the disc. In some cases, the entire disc may be removed, with or without a bony fusion or arthroplasty (disc nucleus replacement or total disc replacement).
  • Open discectomy is usually performed under general anesthesia and typically requires at least a one-day hospital stay. During this procedure, a two to three-inch incision in the skin over the affected area of the spine is made. Muscle tissue may be separated from the bone above and below the affected disc, while retractors hold the wound open so that the surgeon has a clear view of the vertebrae and disc and related structures. The disc or a portion thereof, can then be removed using standard medical equipment, such as rongeurs and curettes.
  • Because open discectomy requires larger incisions, muscle stripping or splitting, more anesthesia, and more operating, hospitalization, and a longer patient recovery time, the trend in spine surgery is moving towards minimally invasive surgical techniques, such as microdiscectomy and percutaneous discectomy.
  • Microdiscectomy uses a microscope or magnifying instrument to view the disc. The magnified view may make it possible for the surgeon to remove herniated disc material through a smaller incision (about twice as small as that required by open discectomy) with smaller instruments, potentially reducing damage to tissue that is intended to be preserved.
  • Percutaneous discectomy is often an outpatient procedure that may be carried out by utilizing hollow needles or cannulae through which special instruments can be deployed into the vertebra and disc in order to cut, remove, irrigate, and aspirate tissue. X-ray pictures and a video screen and computer-aided workstation may be used to guide by the surgeon into the treatment region. Improved imaging and video or computer guidance systems have the potential to reduce the amount of tissue removal required to access and treat the injured tissue or structures. Sometimes an endoscope is inserted to view the intradiscal and perivertebral area.
  • Besides disc hernias, other debilitating spinal conditions or diseases may occur. For example, spinal stenosis, which results from hypertrophic bone and soft tissue growth on a vertebra, reduces the space within the spinal canal. When the nerve roots are pinched, a painful, burning, tingling, and/or numbing sensation is felt down the lower back, down legs, and sometimes in the feet. As illustrated in FIG. 2, the spinal canal 32 has a rounded triangular shape that holds the spinal cord 34 without pinching. The nerve roots 36 leave the spinal canal 32 through the nerve root canals 38, which should be free of obstruction. As shown in FIG. 4, hypertrophic bone growth 48 (e.g., bone spurs, osteophytes, spondylophytes) within the spinal canal 32, and specifically from the diseased lamina 20 and proximate facet joints may cause compression of the nerve roots, which may contribute or lead to the pain of spinal stenosis. Spinal stenosis may be treated by performing a laminectomy or laminectomy in order to decompress the nerve root 36 impinged by the bone growth 48. Along with the laminectomy, a foraminotomy, (i.e., enlarging of the channel from which the nerve roots 36 exit is performed). Depending on the extent of the bone growth, the entire lamina and spinal process may be removed.
  • Another debilitating bone condition is a vertebral body compression fracture (VCF), which may be caused by spinal injuries, bone diseases such as osteoporosis, vertebral hemangiomas, multiple myeloma, necorotic lesions (Kummel's Disease, Avascular Necrosis), and metastatic disease, or other conditions that can cause painful collapse of vertebral bodies. VCFs are common in patients who suffer from these medical conditions, often resulting in pain, compromises to activities of daily living, and even prolonged disability.
  • On some occasions, VCFs may be repaired by cutting, shaping, and removing damaged bone tissue inside a vertebra to create a void, and then injecting a bone cement percutaneously or packing bone graft into the void. This is typically accomplished percutaneously through a cannula to minimize tissue trauma. The hardening (polymerization) of a bone cement media or bone grafting or other suitable biomaterial serves to buttress the bony vault of the vertebral body, providing both increased structural integrity and decreased pain that may be associated with micromotion and progressive collapse of the vertebrae.
  • Thus, it can be appreciated that in many spinal treatment procedures, bone and/or disc tissue must be removed in order to decompress neural tissue or rebuild the bony vertebra or intervertebral disc. In the case of target bone tissue that is adjacent spinal tissue, a physician is required to exercise extreme care when cutting away the target bone tissue (e.g., during a laminectomy and foraminotomy), such that injury to spinal tissue can be prevented. A physician may have difficulty controlling existing bone removal devices, however, and may unintentionally remove healthy bone tissue or injure spinal tissue during use. This problem is exacerbated with percutaneous treatments, which, although less invasive than other procedures, limit the range of motion of the cutting instrument, thereby further limiting the control that the physician may have during the bone cutting procedure.
  • Burr-type tissue removal probes may also be used to remove soft tissue, such as the gel-like nuclear tissue within the intervertebral disc or the cancellous bone tissue within the vertebral body. For example, FIG. 5 illustrates one prior art burr-type tissue removal probe 50 that can be introduced through a delivery cannula (not shown) into contact with the target tissue region to be removed. The tissue removal probe 50 comprises a rigid shaft 52 and a rotatable burr 54 associated with the distal end of the rigid shaft 52. Rotation of a drive shaft 56 extending through the rigid shaft 52, in turn, causes rotation of the burr 54 (either manually or via a motor), thereby removing tissue that comes in contact with the burr 54. Notably, the tissue removal probe 50 is laterally constrained within the cannula (or if a cannula is not shown, constrained by the many layers of tissue that the device 50 must traverse to reach the target tissue), and thus, can only be effectively moved along its longitudinal axis, thereby limiting the amount of tissue that can be removed to the tissue that is on-axis. As such, the tissue removal probe 50 may have to be introduced through several access points within the anatomical body (e.g., the disc or vertebral body) that contains the target tissue in order to remove the desired amount of the tissue.
  • As illustrated in FIG. 6, the distal end 58 of the rigid shaft 52 may be curved in an alternative prior art removal device 60, so that the burr 54 is off-axis from the shaft 52. As such, off-axis target regions can be reached by rotating and axially displacing the rigid shaft 52 about its axis. Because the length of the curved distal end is fixed, however, only the tissue regions that are off-axis by a distance equal to the off-axis distance of the burr 54 will be removed, as illustrated in FIG. 7. In effect, the removal device 60 can only remove a cylindrical outline 62 of the tissue, leaving a cylindrical tissue body 64 behind. Thus, the tissue removal probe 60 must still be introduced into the tissue via several access holes in order to remove any remaining tissue.
  • In addition, because the distal end of the rigid shaft 52 is curved and has a length of the distal tip that is now at an angle to the main shaft, the delivery cannula must be made larger to accommodate the entire profile of the distal end. Thus, the incision through which the cannula is introduced must likewise be made larger. Lastly, if the anatomical body in which the removal device 60 is introduced is relatively thin (e.g., an intervertebral disc is a few millimeters thick), the top or bottom of the anatomical body may hinder movement of the burr 54 as the shaft 52 is rotated around its axis. In such cases, the removal device 60 may have to be introduced along the bottom of the anatomical body to allow tissue to be removed at the top of the anatomical body (i.e., by sweeping the burr 54 along an upper arc until the burr 54 hits the top, or if clearance at the top is available, by sweeping the burr 54 along the upper arc, below the top, until the burr 54 hits the bottom), and then reintroduced along the top of the anatomical body to allow tissue to be removed at the bottom of the anatomical body (i.e., by sweeping the burr 54 along a lower arc until the burr 54 hits the bottom, or if clearance at the bottom is available, by sweeping the burr 54 along the lower arc, above the bottom, until the burr 54 hits the top). As can be appreciated, this excessive movement of the removal device 60 increases the time of the spinal procedure as well as surgical risk due to manipulation of the device.
  • Another problem with current burr-type removal devices is that soft material, such as the nuclear material in an intervertebral disc or cancellous bone within the vertebral body, tends to stick to the burrs, thereby limiting the abrasive effect that the burrs are intended to have in order to efficiently remove tissue. As a result, burr-type removal device may have to be continuously removed from the patient's body in order to clean the soft tissue from the burr.
  • Furthermore, during the tissue removal or cutting process, a media, such as saline, is generally delivered via a tube to a target site for clearing debris. The delivered media together with the debris are then removed from the target site via a separate tube (i.e., the media and the debris are aspirated into a vacuum port of the tube). When the spine is treated percutaneously, however, the delivery cannula must be made large enough to accommodate the tissue removal probe and tubes. As a result, the incision through which the cannula is to be introduced must be made relatively large, thereby unnecessarily causing more tissue trauma.
  • There, thus, remains a need to provide for improved tissue removal probes and methods for use during spinal treatment and other surgeries.
  • SUMMARY OF THE INVENTION
  • In accordance with a first aspect of the present invention, a tissue removal probe is provided. The tissue removal probe particularly lends itself to the removal of soft tissue, such as that contained in intervertebral discs and the cancellous bone in vertebral bodies, but can be used to remove other types of tissue as well. The tissue removal probe comprises an elongated member (such as a sleeve) having a lumen and a pre-curved flexible distal end, a drive shaft rotatably disposed within the member lumen, and a rotatably tissue removal element (e.g., an abrasive burr) disposed on the drive shaft adjacent the member distal end. In one embodiment, the member distal end can be pre-curved at approximately ninety degrees, although other curvatures are possible. By way of non-limiting example, the pre-curved member distal end may associate the tissue removal element, which has its own axis of rotation, with a radius of revolution about the longitudinal axis of the member. The member is laterally flexible and resilient, so that the radius of revolution can be adjusted. The probe may optionally comprise a proximal adapter mounted to the member for mating with a drive unit.
  • In accordance with a second aspect of the present invention, the tissue removal kit comprises a cannula, which may be rigid, e.g., so that it can be introduced through tissue without the aid of other instruments. The cannula may have a tissue-penetrating distal tip to facilitate its introduction harder tissue, such as bone tissue. The tissue removal kit further comprises a tissue removal probe axially slidable within the cannula lumen. The tissue removal probe may optionally be removable from the cannula lumen, so that the cannula can be used for other functions, e.g., delivering therapeutic media. The tissue removal probe comprises an elongated member having a lumen and a distal end configured to curve when distally deployed from the cannula lumen. The deployed member distal end can be configured to curve in any one of a variety of manners. For example, the distal end of the cannula may be curved, the member distal end may be pre-curved, or pull wire(s) can be provided to actively bend the member distal end. In one embodiment, the member distal end can be curved at approximately ninety degrees, although other curvatures are possible.
  • The tissue removal probe further comprises a drive shaft rotatably disposed within the member lumen, and a rotatable tissue removal element (e.g., an abrasive burr) disposed on the drive shaft adjacent the member distal end. By way of non-limiting example, the curved member distal end may associate the tissue removal element, which has its own axis of rotation, with a radius of revolution about the longitudinal axis of the straight portion of the member. The member is laterally flexible and resilient, so that the radius of revolution can be adjusted. The probe may optionally comprise a proximal adapter mounted to the member for mating with a drive unit.
  • In accordance with a third aspect of the present inventions, a method of removing tissue from an anatomical body (e.g., an intervertebral disc or vertebral body) is provided. The method comprises introducing a cannula into the anatomical body at a first location, and introducing a tissue removal probe through the cannula. The tissue removal probe may be introduced into the cannula prior or subsequent to the introduction of the cannula into the anatomical body. The tissue removal probe comprises an elongated member having a straight portion and a distal end, and a distally located tissue removal element associated with the member distal end. The method further comprises displacing the tissue removal element a first distance from the cannula, wherein the distal end bends to associate the tissue removal element with a first radius of revolution about a rotational axis of the straight portion of the member. In one method, the member distal end bends because it is pre-curved or the cannula distal end is curved. The method further comprises rotating the member around its rotational axis, wherein the tissue removal element scribes a first arc defined by the first radius of revolution. In one preferred method, the first arc forms an entire circle. The method further comprises rotating the tissue removal element about its axis of rotation to remove tissue at at least two points along the first arc. The tissue removal element may be rotated while the straight member portion is rotated, so that the tissue removal element continuously removes tissue along the first arc.
  • Optionally, the method may comprise displacing the tissue removal element a second distance from the cannula, wherein the distal end bends to associate the tissue removal element with a second radius of revolution different from the first radius of revolution. The method may further comprise rotating the straight member portion around the first axis of rotation, wherein the tissue removal element scribes a second arc defined by the second radius of revolution (which may be greater than the first radius of revolution), and rotating the tissue removal element about the second axis of rotation to remove tissue at at least two points along the second arc. The second arc may also form an entire circle. In this case, a solid disc of tissue may be removed.
  • The method may optionally comprise displacing the cannula along the first axis of rotation to a second location, and repeating the member distal end displacement, straight member portion rotation, and tissue removal element rotation steps. In this case, a solid cylinder of tissue is removed if the first and second arcs are entire circles.
  • In accordance with a fourth aspect of the present inventions, another method of removing tissue from an anatomical body (e.g., an intervertebral disc or vertebral body) is provided. The method comprises introducing a cannula into the anatomical body at a first location, and introducing a tissue removal probe through the cannula. The tissue removal probe may be introduced into the cannula prior or subsequent to the introduction of the cannula into the anatomical body.
  • The tissue removal probe comprises an elongated member having a distal end, and a distally located tissue removal element associated with the member distal end. The method further comprises displacing the tissue removal element a first distance from the cannula to associate the tissue removal element with a first radius of curvature. The method further comprises bending the member distal end, wherein the tissue removal element scribes a first arc defined by the first radius of curvature. In one method, the member distal end can be actively bent using at least one pull wire. In one preferred method, the first arc forms a semi-circle. The method further comprises rotating the tissue removal element about its axis of rotation to remove tissue at at least two points along the first arc. The tissue removal element may be rotated while the member distal end is bent, so that the tissue removal element continuously removes tissue along the first arc.
  • Optionally, the method may comprise displacing the tissue removal element a second distance from the cannula to associate the tissue removal element with a second radius of curvature different from the first radius of curvature. The method may further comprise bending the member distal end, wherein the tissue removal element scribes a second arc defined by the second radius of curvature (which may be greater than the first radius of curvature), and rotating the tissue removal element about its axis of rotation to remove tissue at at least two points along the second arc. The second arc may also form a semi-circle. In this case, a solid sector of tissue may be removed.
  • BRIEF DESCRIPTION OF THE DRAWINGS
  • The drawings illustrate the design and utility of preferred embodiments of the present invention. It should be noted that the figures are not drawn to scale and that elements of similar structures or functions are represented by like reference numerals throughout the figures. In order to better appreciate how the above-recited and other advantages and objects of the present inventions are obtained, a more particular description of the present inventions briefly described above will be rendered by reference to specific embodiments thereof, which are illustrated in the accompanying drawings. Understanding that these drawings depict only typical embodiments of the invention and are not therefore to be considered limiting of its scope, the invention will be described and explained with additional specificity and detail through the use of the accompanying drawings in which:
  • FIG. 1 is a perspective view of a portion of a spine;
  • FIG. 2 is a top view of a vertebra with a healthy intervertebral disc;
  • FIG. 3 is a top view of a vertebra with a herniated intervertebral disc;
  • FIG. 4 is a top view of a vertebra with spinal stenosis;
  • FIG. 5 is a prior art tissue removal probe;
  • FIG. 6 is another prior art tissue removal probe;
  • FIG. 7 is a plan view showing tissue removal using the tissue removal probe of FIG. 6;
  • FIG. 8 is a perspective view of a tissue removal system arranged in accordance with a preferred embodiment of the present invention;
  • FIG. 9 is perspective view of a tissue removal probe that can be used in the system of FIG. 8;
  • FIG. 10 is a partially cutaway side view of the distal end of the probe of FIG. 9, particularly showing the tissue removal element retracted within the probe shaft;
  • FIG. 11 is a partially cutaway side view of the distal end of the probe of FIG. 9, particularly showing the tissue removal element partially deployed from the probe shaft;
  • FIG. 12 is a partially cutaway side view of the distal end of the probe of FIG. 9, particularly showing the tissue removal element fully deployed from the probe shaft;
  • FIG. 13 is a perspective view of a variation of the probe of FIG. 9, particularly showing irrigation and aspiration lumens;
  • FIGS. 14A-14G are perspective views showing a method of using the tissue removal system of FIG. 8 to remove tissue within a herniated intervertebral disc;
  • FIG. 15 is a partially cutaway side view of the distal end of another tissue removal probe that can be used in the tissue removal system of FIG. 8, particularly showing the tissue removal element retracted within the probe shaft;
  • FIG. 16 is a partially cutaway side view of the distal end of the probe of FIG. 15, particularly showing the tissue removal element partially deployed from the probe shaft;
  • FIG. 17 is a partially cutaway side view of the distal end of the probe of FIG. 15, particularly showing the tissue removal element fully deployed from the probe shaft;
  • FIG. 18 is perspective view of still another tissue removal probe that can be used in the system of FIG. 8;
  • FIG. 19 is a partially cut-away side view of the distal end of the probe of FIG. 18, particularly showing a tissue removal element;
  • FIG. 20 is a partially cut-away side view of a variation of the distal end of the probe of FIG. 18, particularly showing a variation of the tissue removal element;
  • FIG. 21 is perspective view of yet another tissue removal probe that can be used in the system of FIG. 8;
  • FIGS. 22A-22D are side views of the distal end of the probe of FIG. 21, particularly showing a transformation of the probe from a tissue-cutting device to a tissue-grasping device;
  • FIG. 23 is perspective view of yet another tissue removal probe that can be used in the system of FIG. 8;
  • FIG. 24 is a partially cut-away side view of the distal end of the probe of FIG. 23;
  • FIG. 25 is perspective view of yet another tissue removal probe that can be used in the system of FIG. 8;
  • FIG. 26 is a partially cut-away side view of the distal end of yet another tissue removal probe that can be used in the system of FIG. 8;
  • FIG. 27 is perspective view of yet another tissue removal probe that can be used in the system of FIG. 8;
  • FIG. 28 is a cross-sectional view of the probe of FIG. 27, taken along the line 28-28;
  • FIG. 29 is perspective view of yet another tissue removal probe that can be used in the system of FIG. 8;
  • FIG. 30 is a partially cutaway side view of the distal end of still another tissue removal probe that can be used in the tissue removal system of FIG. 8, particularly showing the tissue removal element retracted within the probe shaft;
  • FIG. 31 is a cross-sectional view of the distal end of the tissue removal probe of FIG. 30, taken along the line 31-31;
  • FIG. 32 is a partially cutaway side view of the distal end of the probe of FIG. 30, particularly showing the tissue removal element partially deployed from the probe shaft;
  • FIG. 33 is a partially cutaway side view of the distal end of the probe of FIG. 30, particularly showing the tissue removal element fully deployed from the probe shaft; and
  • FIGS. 34A-34D are perspective views showing a method of using the tissue removal system of FIG. 8, with the tissue removal probe of FIG. 30, to remove tissue within a herniated intervertebral disc.
  • DETAILED DESCRIPTION OF THE EMBODIMENTS
  • FIG. 8 illustrates a tissue removal system 100 constructed in accordance with a preferred embodiment of the present inventions. The system 100 generally comprises a tissue removal probe assembly 102 and a rotary drive unit 104 connected to the probe assembly 102 via a drive cable 106. The drive unit 104 may take the form of a standard rotary drive used for powering medical cutting instruments. The tissue removal probe assembly 102 comprises a cannula 108 and a tissue removal probe 110 disposed therein.
  • The cannula 108 comprises a shaft 112 having a distal end 114 and proximal end 116, a lumen 118 (shown in phantom) terminating in an exit port 120 at the distal end 114 of the cannula shaft 112, and a handle 122 mounted on the proximal end 116 of the cannula shaft 112. To facilitate introduction through tissue, the cannula shaft 112 is preferably stiff (e.g., it can be composed of a stiff material, or reinforced with a coating or a coil to control the amount of flexing), so that the cannula shaft 112 can penetrate the tissue without being damaged. The materials used in constructing the cannula shaft 112 may comprise any of a wide variety of biocompatible materials. In a preferred embodiment, a radiopaque material, such as metal (e.g., stainless steel, titanium alloys, or cobalt alloys) or a polymer (e.g., ultra high molecular weight polyethylene) may be used, as is well known in the art. Alternatively, if supported by a rigid member during introduction into the tissue, the cannula shaft 112 may be flexible. The handle 122 is preferably composed of a durable and rigid material, such as medical grade plastic, and is ergonomically molded to allow a physician to more easily manipulate the cannula 108.
  • The outer diameter of the cannula shaft 112 is preferably less than ½ inch, but other dimensions for the outer diameter of the cannula shaft 112 may also be appropriate, depending on the particular application or clinical procedure. The cannula lumen 118 should have an inner diameter so as to allow the tissue removal probe 110 to be slidably housed therein, as will be described in further detail below. In the illustrated embodiment, the profile of the cannula lumen 118 is circular, but can be other shapes as well. In the illustrated embodiment, the distal tip of the cannula shaft 112 is blunt. In this case, the thickness and cross-sectional profile of the cannula shaft 112 is small enough, so that the distal tip can be used as a cutting or deforming tool for boring or coring through tissue. Alternatively, the distal tip of the cannula shaft 112 may be advantageously sharpened or wedged to facilitate its introduction into bone structure. Even more alternatively, a stilette (not shown) can be introduced through the cannula lumen 118 to provide an independent means for boring through bone structure. In this manner, bone cores will not block the cannula lumen 118, which may otherwise prevent, or at least make difficult, deployment of the tissue removal probe 110 and other therapeutic materials.
  • Referring now to FIG. 9, the tissue removal probe 110 will described in further detail. The tissue removal probe 110 comprises a sleeve 124 having a distal end 126 and a proximal end 128, and a lumen 130 (shown in phantom) extending through the sleeve 124. The tissue removal probe 110 further comprises a drive shaft 132 rotatably disposed within the sleeve lumen 130 and a rotatable tissue removal element, and in particular, an abrasive burr 134, mounted to the distal end of the drive shaft 132. The burr 134 has a pattern of cutting edges 136 that facilitate removal of tissue that comes in contact with the rotating burr 134. In the illustrated embodiment, the burr 134 is fully exposed in that it entirely resides outside of the sleeve 124. In alternative embodiments, the burr 134 may be seated within the distal end of a sheath, and exposed through a window cutout from the distal end of the sheath. Other types of tissue-cutting element can also be used in place of the burr 134. Examples of other tissue-cutting elements will subsequently be described.
  • The tissue removal probe 110 further comprises a proximal adapter 138 mounted to the proximal end 128 of the sleeve 124. The proximal adapter 138 is configured to be mated with the drive cable 106, thereby providing a means for rotatably coupling the drive unit 104 to the proximal end of the drive shaft 132. Thus, operation of the drive unit 104 will rotate the drive shaft 132, which in turn, will rotate the burr 134 about its rotational axis 140. Details of the structure of standard tissue removal probes, including the aforementioned window-exposed burr and proximal adapter, are disclosed in U.S. Pat. No. 5,913,867, which is expressly incorporated herein by reference.
  • The tissue removal probe 110 is rotatably disposed within the cannula lumen 118, such that the sleeve 124 (and in particular, the straight portion of the sleeve) has an axis of rotation 142 (i.e., the sleeve 124 can be rotated about the rotational axis 142, e.g., when the proximal end 128 of sleeve distal end 126 is manually rotated). As illustrated in FIG. 9, the rotational axes 140 and 142 of the respective burr 132 and sleeve 124 are coincident with each other when the entirety of the sleeve 124 is straight. As will be described in below, the rotational axes 140 and 142 will diverge from each other when the distal end 126 of the sleeve 124 is curved or bent.
  • As illustrated in FIGS. 10-12, the tissue removal probe 110 is slidably disposed in the cannula lumen 118 in the longitudinal direction, so that the burr 134 can be incrementally deployed from the exit port 120 of the cannula shaft 112 and retracted within the distal end 114 of the cannula shaft 112.
  • As can be seen from FIG. 10, when confined within the cannula lumen 118, the sleeve 124 assumes a substantially straight configuration and conforms to the shape of the cannula shaft 112. As can be seen from FIGS. 11 and 12, the distal end 126 of the sleeve 124, when in its relaxed state, has a pre-shaped curved portion 144 and a pre-shaped straight portion 146 distal to the curved portion 144. In the illustrated embodiment, the curved portion 144 defines an arc of ninety-degrees. It should be noted, however, the curved portion 144 may define other arcs. So that the distal end 126 of the sleeve 124 readily assumes and maintains its defined shape, the sleeve 124 is composed of a laterally flexible, yet resilient, material, such as nitinol. Significantly, the drive shaft 132 is also laterally flexible, and thus easily conforms to the curved geometry of the deployed sleeve distal end 126. In this manner, the burr 134 will rotate about its rotational axis 140 even if the drive shaft 132 is bent.
  • As can be appreciated from FIGS. 11 and 12, the distal end 126 of the sleeve 124 can be deployed from the cannula exit port 120 in stages. For example, the sleeve distal end 126 can be deployed a first distance from the distal end 114 of the cannula shaft 112, so that the burr 134 defines a particular radius of revolution r1 (shown in FIG. 11) around the rotational axis 142 of the sleeve 124. The sleeve distal end 126 can be deployed a second greater distance from the distal end 126 of the cannula shaft 112, so that the burr 134 defines a second greater radius of revolution r2 (shown in FIG. 12) around the rotational axis 142 of the sleeve 124 Thus, it can be appreciated that radius of revolution r of the burr 134 can be adjusted simply by displacing the sleeve 124 within the cannula lumen 118.
  • As illustrated in FIG. 13, the tissue removal probe 110 can optionally have irrigation and aspiration capability. In particular, the sleeve 124, in addition to having the lumen 130 through which the drive shaft 132 extends, includes irrigation and aspiration lumens 148 and 150 (shown in phantom). The irrigation lumen 148 terminates at an irrigation outlet port 152 in the sleeve distal end 126 and proximally terminates at an irrigation inlet port (not shown) in the proximal adapter 138. Likewise, the aspiration lumen 150 terminates at an aspiration entry port 154 in the sleeve distal end 126 and proximally terminates at an aspiration outlet port (not shown) in the proximal adapter 138. Alternatively, irrigation and/or aspiration ports can be placed in the burr 134.
  • As can be appreciated, a pump (not shown) can be connected to the irrigation inlet port on the proximal adapter 138 in order to flush irrigation fluid, such as saline, through the irrigation lumen 148 and out the irrigation outlet port 152. The irrigation fluid helps cool the drive shaft 132 and/or the burr 134, while the burr 134 is rotating at high speed and grinding against tissue. The media also washes away debris at the target site. A vacuum (not shown) can be connected to the aspiration outlet port on the proximal adapter 138 in order to aspirate the removed tissue into the aspiration inlet port 154, through the aspiration lumen 150, and out of the aspiration outlet port. Because there are separate irrigation and aspiration lumens 148 and 150, both the pump and aspirator can be activated simultaneously or separately.
  • Having described the structure of the tissue removal system 100, its operation will now be described with reference to FIGS. 14A-14G, in removing soft tissue from an anatomical body, and in particular, in performing a discectomy on a herniated intervertebral disc. It should be noted, however, that other tissue, such as the cancellous tissue within a vertebral body, could also be removed by the tissue removal system 100.
  • First, the cannula 108 is introduced through a small incision 41 in the back 39 and into the herniated disc 12′ (FIG. 14A). In some circumstances, a laminectomy may have to be performed to access the disc 12′. In such cases, the cannula 108 may be used to bore through the lamina (not shown). Torsional and/or axial motion may be applied to the cannula 108 to facilitate boring of the lamina. The torsional and/or axial motion may be applied manually or mechanically (i.e., by a machine). An object, such as a hammer or a plunger, may also be used to tap against the handle 122 of the cannula 108 in order to facilitate boring through the lamina. Alternatively, a stilette (not shown) can be introduced through the cannula lumen (not shown in FIG. 14A) to create a passage through the lamina. Or, a separate drill or bone cutting device, such as those described below, can be used to bore or cut a passage through the lamina prior to placement of the cannula 108.
  • In the illustrated method, the cannula 108 is introduced into the disc 12′, such that its distal tip is placed adjacent the distal-most region of the target tissue. In this case, distal to the herniation 46. Next, the tissue removal probe 110 is introduced through the cannula lumen 118 until the distal end 126 of the sleeve 124 deploys out from exit port 120 of the cannula shaft 112 a first distance (FIG. 14B), which as described above, associates the burr 134 with a first radius of revolution r1 around the rotational axis 142 of the sleeve 124. The tissue removal probe 110 can either be introduced into the cannula lumen 118 prior to introduction of the cannula 108 into the patient's back (in which case, the tissue removal probe 110 will be fully retracted within the cannula lumen 118 during introduction of the cannula 108) or can be introduced into the cannula lumen 118 after the cannula 108 has been introduced into, and properly positioned, within the disc 12′.
  • Next, the proximal adapter 138 of the tissue removal probe 110 is mated to the drive unit (shown in FIG. 8), which is then operated to rotate the burr 134 about is own rotational axis 140. At the same time, the sleeve 124 is manually rotated (e.g., by rotating the proximal adapter 138), which causes the burr 134 to scribe an arc a1 around the rotational axis 142 of the sleeve 124 (FIG. 14C). As a result, tissue is removed by the rotating burr 134 along the arc a1. In the illustrated method, the sleeve 124 is rotated until the burr 134 scribes an entire circle around the rotational axis 142 of the sleeve 124. In this manner, a full circle of tissue is removed by the burr 134. In the illustrated method, the radius of revolution of the burr 134 is so short that both on-axis and off-axis tissue is essentially removed. In effect, the burr 134 removes a small disc of tissue at this point. It should be noted that, during the tissue removal procedure, the removed tissue could be aspirated from the herniated disc 12′ using an aspirator. Aspiration of the tissue can be accomplished via the cannula or through another cannula. Alternatively, as previously described, aspiration can be accomplished via the tissue removal probe 110, itself.
  • Next, the tissue removal probe 110 is further introduced through the cannula lumen 118 until the distal end 126 of the sleeve 124 deploys out from the exit port 120 of the cannula shaft 112 a second greater distance (FIG. 14D), which as described above, associates the burr 134 with a second greater radius of revolution r2 around the rotational axis 142 of the sleeve 124. Again, the drive unit 104 is operated to rotate the burr 134 about is own rotational axis 140, while manually rotating the sleeve 124, which causes the burr 134 to scribe another larger arc a2 around the rotational axis 142 of the sleeve 124 (FIG. 14E). As a result, a ring of tissue is removed by the rotating burr 134 along the larger arc a2. Again, the sleeve 124 is rotated until the burr 134 scribes an entire circle around the rotational axis 142 of the sleeve 124. In this manner, a full circle of tissue is removed by the burr 134. The difference between the first and second radii and of revolution r1 and r2 is such that the disc of tissue removed by the burr 134 along the first arc a1 is coextensive with the ring of tissue removed by the burr 134 along the second arc a2. The steps illustrated in FIGS. 14D and 14E can be repeated to remove even larger discs of tissue.
  • Next, the cannula 108 is displaced in the proximal direction, and the tissue removal probe 110 is retracted, so that the sleeve distal end 126 deploys out from the exit port 120 of the cannula shaft 112 the first distance (FIG. 14F). The steps illustrated in FIGS. 14B-14E are then repeated to remove another disc of tissue (FIG. 14G). In the illustrated method, the proximal displacement of the cannula 108 is such that the first and second discs of removed tissue are contiguous. As such, a cylinder of tissue is removed. A longer cylinder of tissue can be removed by repeating the steps illustrated in FIGS. 14F and 14G. After the discectomy has been completed (i.e., the herniated disc material has been removed, or in some cases, the entire herniated disc has been removed), the cannula 108, along with the tissue removal probe 110, is removed from the patient's body. Alternatively, prior to total removal of the cannula 108, the tissue removal probe 110 can be removed, and a therapeutic media, such as a drug or disc replacement material can be delivered through the cannula lumen 118 into the disc 12′.
  • Although curved portion 144 of the sleeve distal end 126 is pre-shaped in order to create a radius of revolution r for the deployed burr 134, there are other means for bending the distal end of a sleeve as it deploys from a cannula. For example, FIGS. 15-17 illustrate a tissue removal assembly 202 that bends a deploying sleeve using the cannula, itself. In particular, the tissue removal assembly 202 comprises a cannula 208, which is similar to the previously described cannula 108, with the exception that it comprises a cannula shaft 212 with a curved distal end 214. In the illustrated embodiment, the distal end 214 of the cannula 208 assumes a ninety-degree curve. The tissue removal assembly 202 comprises a tissue removal probe 210 that is similar to the previously described tissue removal probe 110, with the exception that it comprises a sleeve 224 that does not have a pre-curved distal end. Instead, the entire sleeve 224 is configured to assume a straight configuration in its relaxed state.
  • As can be seen from FIG. 15, when confined within the cannula lumen 218, the sleeve 224 assumes a substantially straight configuration and conforms to the shape of the cannula shaft 212. As can be seen from FIGS. 16 and 17, the distal end 226 of the sleeve 224 bends when deployed from the distal end of the cannula shaft 112. That is, as it is deployed, the sleeve distal end 226 contacts the inner surface of the curved cannula distal end 214, thereby deflecting the sleeve distal end 226 as its exits the cannula lumen 218. Like the previously described sleeve 124, the sleeve is laterally resilient, such that it maintains its shape as it deploys from the exit port 220 at the distal end 214 of the cannula shaft 212.
  • As with the previously described sleeve distal end 126, the sleeve distal end 226 can be deployed from the exit port 220 of the cannula shaft 212 in stages. For example, the sleeve distal end 226 can be deployed a particular distance from exit port 220, so that the burr 134 defines a particular radius of revolution r1 (shown in FIG. 16) around the rotational axis 242 of the sleeve 224. The sleeve distal end 226 can be deployed a second greater distance from the exit port 220, so that the burr 134 defines a second greater particular radius of revolution r2 (shown in FIG. 17) around the rotational axis 242 of the sleeve 224. Thus, it can be appreciated that radius of revolution r of the burr 134 can be adjusted simply by displacing the sleeve 224 within the cannula lumen 218.
  • Operation of the tissue removal assembly 202 in removing soft tissue is similar to the operation of the previously described tissue removal assembly 102, and will thus, not be further described.
  • As another example, FIGS. 30-33 illustrate a tissue removal assembly 252 that has a sleeve with steering functionality. In particular, the tissue removal assembly 252 comprises the previously described cannula 108, and a tissue removal probe 260 that is similar to the previously described tissue removal probe 110, with the exception that it does not have a pre-curved distal end, but instead, comprises a pair of pull wires 254 (shown in FIG. 31) extending through a respective pair of pull wire lumens 256 contained within the sleeve 124. The distal ends of the pull wires 254 are mounted to the distal tip of the sleeve 124 in a suitable manner. As can be seen from FIG. 30, when confined within the cannula lumen 218, the sleeve 124 assumes a substantially straight configuration and conforms to the shape of the cannula shaft 112. As can be seen from FIGS. 32 and 33, the distal end 126 of the sleeve 124, when deployed from the exit port 120 of the cannula shaft 112, bends in one direction when one of the pull wires 254 is pulled.
  • As with the previously described tissue removal probe 110, the sleeve distal end 126 can be deployed from the exit port 120 of the cannula shaft 112 in stages. For example, the sleeve distal end 126 can be deployed a first distance from exit port 120 and one of the pull wires 254 pulled to bend the sleeve distal end 126, so that the burr 134 defines a particular radius of revolution r1 (shown in FIG. 32) around the rotational axis 142 of the sleeve 124. The sleeve distal end 126 can be deployed a second greater distance from the exit port 120 and the pull wire 254 pulled to bend the sleeve distal end 126 again, so that the burr 134 defines a second greater particular radius of revolution r2 (shown in FIG. 33) around the rotational axis 142 of the sleeve 124. Thus, it can be appreciated that radius of revolution r of the burr 134 can be adjusted simply by displacing the sleeve 124 within the cannula lumen 118 and pulling one of the pull wires 254 to bend the sleeve distal end 126.
  • Operation of the tissue removal assembly 252 in removing soft tissue is similar to the operation of the previously described tissue removal assembly 102, with the exception that the pull wires 254 are used to actively bend the distal end 126 of the sheath 124.
  • Alternatively, as illustrated in FIGS. 34A-34F, the tissue removal assembly 252 may be used in a different manner to remove soft tissue from an anatomical body, and in particular, in performing a discectomy on a herniated intervertebral disc. This alternative method is accomplished by bending the distal end 126 of the sleeve 124 in opposite directions using the pull wires 254, while rotating the burr 134, thereby removing tissue in an arc that is coplanar with the plane of the axis 142. In this case, a layer of tissue is removed in a plane that is parallel with the flat sides of the herniated disc.
  • In particular, after the cannula 108 is introduced into the herniated disc 12′ in the same manner previously illustrated in FIG. 14A, the tissue removal probe 260 is introduced through the cannula lumen 118 until the distal end 126 of the sleeve 124 deploys out from exit port 120 of the cannula shaft 112 a first distance (FIG. 34A), which associates the burr 134 with a first radius of curvature r1 (shown in FIG. 34B). Next, the proximal adapter 138 of the tissue removal probe 210 is mated to the drive unit (shown in FIG. 8), which is then operated to rotate the burr 134 about is own rotational axis 140. At the same time, the distal end 126 of the sleeve 124 is bent in one direction by pulling one of the pull wires 254 (shown in FIG. 34A), which causes the rotating burr 134 to scribe a ninety degree arc a1 (as measured from the longitudinal axis 142) around the distal tip of the sleeve 124 (FIG. 34B). Next, the distal end 126 of the sleeve 124 is bent in the opposite direction by pulling the other pull wire 254, which causes the rotating burr 134 to scribe a one hundred eighty degree arc a1 (ninety degrees above the longitudinal axis 142 and ninety degrees below the longitudinal axis 142) around the distal tip of the sleeve 124 (shown in phantom in FIG. 34B). In this manner, a semi-circle of tissue is removed by the burr 134. In the illustrated method, the radius of curvature of the burr 134 is so short that a solid radial sector of tissue is removed. As with the previous methods, the remove tissue can optionally be aspirated.
  • Next, the tissue removal probe 210 is further introduced through the cannula lumen 118 until the distal end 126 of the sleeve 124 deploys out from the exit port 120 of the cannula shaft 112 a second greater distance (FIG. 34C), which associates the burr 134 with a second greater radius of curvature r2 (shown in FIG. 34D). Again, the drive unit 104 is operated to rotate the burr 134 about is own rotational axis 140, while bending the distal end 126 of the sleeve 124 in one direction using the first pull wire 254 (shown in FIG. 34C), which causes the burr 134 to scribe another larger ninety degree arc a2 around the distal tip of the sleeve 124 (FIG. 34D). Next, the distal end 126 of the sleeve 124 is bent in the opposite direction by pulling the other pull wire 254, which causes the rotating burr 134 to scribe a one hundred eighty degree arc a2 around the distal tip of the sleeve 124 (shown in phantom in FIG. 34D). In this manner, a semi-circlular ring of tissue is removed by the burr 134.
  • The difference between the first and second radii and of curvature r1 and r2 is such that the radial sector of tissue removed by the burr 134 along the first arc a1 is coextensive with the semi-circular ring of tissue removed by the burr 134 along the second arc c2. The steps illustrated in FIGS. 34C and 34D can be repeated to remove even larger discs of tissue.
  • After the discectomy has been completed (i.e., the herniated disc material has been removed, or in some cases, the entire herniated disc has been removed), the cannula 108, along with the tissue removal probe 110, is removed from the patient's body. Alternatively, prior to total removal of the cannula 108, the tissue removal probe 260 can be removed, and a therapeutic media, such as a drug or disc replacement material can be delivered through the cannula lumen 118 into the disc 12′.
  • Referring now to FIGS. 18 and 19, another tissue removal probe 310 that can alternatively be used in the tissue removal system 100 will be described. The tissue removal probe 310 comprises a sleeve 324 having a distal end 326 and a proximal end 328, and a lumen 330 (shown in phantom in FIG. 18) extending through the sleeve 324. The tissue removal probe 310 further comprises a drive shaft 332 rotatably disposed within the sleeve lumen 330 and a rotatable tissue removal element, and in particular, a rotatable cutting basket 334, mounted to the distal end of the drive shaft 332. The tissue removal probe 310 further comprises a proximal adapter 338 mounted to the proximal end 328 of the sleeve 324. The proximal adapter 338 is configured to be mated with the drive cable 106, thereby providing a means for rotatably coupling the drive unit 104 to the proximal end of the drive shaft 332. Thus, operation of the drive unit 104 will rotate the drive shaft 332, which, in turn, will rotate the cutting basket 334 about its rotational axis 340. Like the tissue removal probe 110, the tissue removal probe 310 can be rotatably disposed within the lumen 118 of the cannula 108, so that the cutting basket 334 can be alternately deployed from and retracted into the distal end 114 of the cannula shaft 112.
  • The cutting basket 334 comprises a base member 344, a distal hub 346, and a plurality of filaments 348 proximally affixed to the base member 344 and distally affixed to the distal hub 346. The base member 344 is mounted to the distal end of the drive shaft 332 using suitable means, such as soldering or welding. The distal hub 346 is preferably rounded, such that only lateral tissue removal is achieved, and inadvertent tissue trauma distal to the cutting basket 334 is prevented. As shown in FIGS. 18 and 19, the shape of the filaments 348 is sinusoidal, although other shapes can be provided. Although three filaments 348 are shown, the cutting basket 334 may include a different number of filaments 348. The filaments 348 are also interlaced or braided to provide the cutting basket 334 with a more integral structure.
  • In alternative embodiments, however, the filaments 348 can configured differently. For example, FIG. 20 illustrates an alternative cutting basket 354, wherein the filaments 348, the proximal and distal ends of which are mounted to the base member 344, thereby affixing the filaments 348 at the proximal end of the cutting basket 334. The filaments 348 are affixed at the distal end of the cutting basket 334 by looping the filaments 348 through the distal hub 346.
  • Whichever filament configuration is used, the cross-sectional shape of each filament 348 can be circular, rectangular, elliptical, or other customized shapes. As can be appreciated, the large spaces between the filaments 348 prevent, or at the least minimize, the build-up of tissue on the cutting basket 334. If bone tissue is to be removed, the filaments 348 are preferably made from a tough material, such as steel or other alloys, so that it could penetrate or cut into a bone structure without being damaged. The stiffness of the filaments 348 are preferably selected so that the cutting basket 334 is stiff enough to cut, deform, and/or compact target bone tissue. In the case where soft tissue is to be removed, the filaments 348 may likewise be composed of a soft material. In any event, the material from which the filaments 348 are made are resilient, such that cutting basket 334 assumes a low profile while residing within the cannula lumen 330, and is free to assume an expanded profile when deployed outside of the cannula lumen 330. In the illustrated embodiment, the cutting basket 334 is 1 cm in length and ½ cm in diameter.
  • In some embodiments, the filaments 348 have sharp edges, thereby providing bone, disc or soft tissue cutting/drilling capability. In other embodiments, the cutting basket 334 includes abrasive particles, such as diamond dusts, disposed on surfaces of the filaments 348, for cutting, digging, and/or sanding against target bone, disc or soft tissue. The filaments 348 are connected between the base member 344 and distal hub 346 and drive shaft 332 using means, such as a welding, brazing, or glue, depending on the materials from which the distal hub, filaments, and drive shaft 332 are made. Alternatively, the filaments 348 are connected between the distal hub 346 and drive shaft 332 by a snap-fit connection, a screw connection, or otherwise an interference-fit connection.
  • The tissue ablation probe 310 optionally comprises a guidewire 352 that extends through a lumen 353 (shown in phantom) within the drive shaft 332, and is mounted to the distal hub 346 of the cutting basket 334. In this manner, the lateral movement of the cutting basket 334 during operation is limited.
  • Referring now to FIG. 21, still another tissue removal probe 410 that can alternatively be used in the tissue removal system 100 will be described. The tissue removal probe 410 is similar to the previously described tissue removal probe 310 in that it comprises the sleeve 324, drive shaft 332, and proximal adapter 338. The tissue removal probe 410 differs from the tissue removal probe 310 in that it comprises a tissue removal device, and in particular, a cutting basket, that can be transformed between a tissue-cutting device and a tissue grasper.
  • In particular, the cutting basket 434 comprises a base member 444, a distal hub 446, and a plurality of filaments 448 proximally affixed to the base member 444 and distally affixed to the distal hub 446. The base member 444 is mounted to the distal end of the drive shaft 332 using suitable means, such as soldering or welding. The distal hub 446 is preferably rounded, such that only lateral tissue removal is achieved, and inadvertent tissue trauma distal to the cutting basket 434 is prevented. The filaments 448 may have the same composition as the previously described filaments 448.
  • Each filament 448, however, has a hinge point 450 that divides the filament 448 into a proximal filament segment 452 and a distal filament segment 454. As shown in the progression illustrated in FIGS. 22A-22D, pulling the distal hub 446 in the proximal direction causes the distal end of the cutting basket 434 to invert into the proximal end of the cutting basket 434. That is, the distal filament segments 454 fold around the hinge points 450 towards the proximal filament segments 452, transforming the folded filaments 448 into tissue-grasping arms, with the hinge points 450 forming the most distal points of the arms. Notably, the hinge points 450 are located distal to the midpoints of the filaments 448 (i.e., the distal filament segments 454 are shorter than the proximal filament segments 452). In this manner, the resulting tissue-grasping arms are relatively short, and therefore have a greater resistance to lateral bending when grasping tissue.
  • The actuating device takes the form of a pull wire 456 that extends through the lumen 353 in the drive shaft 332, attaching to the distal hub 446. Thus, when the pull wire 456 is pulled, the cutting basket 434 is transformed from a tissue-cutting device to a tissue-grasping device. When the pull wire 456 is relaxed, the tissue-grasping device (due to its resiliency) reverts back to a tissue-cutting device. That is, the distal filament segments 454 will fold back around the hinge points 450 away from the proximal filament segments 452, transforming the filaments 448 into tissue-cutting filaments.
  • Referring now to FIGS. 23 and 24, yet another tissue removal probe 510 that can alternatively be used in the tissue removal system 100 will be described. The tissue removal probe 510 is similar to the previously described tissue removal probe 310 in that it comprises the sleeve 324 and proximal adapter 338. The tissue removal probe 510 differs from the tissue removal probe 310 in that it has tissue irrigating functionality and minimizes inadvertent trauma to distal tissue, otherwise caused by a tissue removal element 534.
  • In particular, the tissue removal probe 510 comprises a drive shaft 532, which is composed of a rigid material, such as stainless steel, and has a distal end with a non-traumatic blunt tip 536. The blunt tip 536 prevents the tissue removal element 534 from abrading or harming distal tissue during use. In the illustrated embodiment, the blunt tip 536 has a spherical shape. In alternative embodiments, however, the blunt tip 536 can have other shapes as well. The drive shaft 332 further comprises an irrigation lumen 538 (shown in phantom) that terminates in an irrigation port 540 at the blunt tip 536. As previously described, irrigation fluid can be delivered through the irrigation lumen 538 and out of the irrigation port 540 in order to cool the drive shaft 332 and/or tissue removal element 534, as well as to wash debris at the target site. The irrigation lumen 538 can alternatively be used as a guidewire lumen.
  • The tissue removal element 534 is formed on the distal end of the drive shaft 332 just proximal to the blunt tip 536. In the illustrated embodiment, the tissue removal device 534 comprises an ellipsoidal burr, although other geometrically shaped burrs can be used. Unlike a cutting basket, the cross-section of the burr 534 is relatively more solid, thereby providing more stiffness. Such configuration is advantageous in that it allows cutting and/or abrading of stiff materials without deforming. In the illustrated embodiment, the burr 534 includes abrasive particles, such as diamond dusts, that are disposed on the surface of the burr 534. In other embodiments, instead of having diamond dusts, parts of the surface of the burr 534 can be removed to create an abrasive surface. The burr 534 further comprises a spiral cutting groove 542. During use, the groove 542 allows bone particles that have been removed to travel proximally and away from a target site.
  • Referring now to FIG. 25, yet another tissue removal probe 610 that can alternatively be used in the tissue removal system 100 will be described. The tissue removal probe 610 is similar to the previously described tissue removal probe 310 in that it comprises the sleeve 324, drive shaft 332, and proximal adapter 338. The tissue removal probe 610 differs from the tissue removal probe 310 in that it comprises a tissue removal element 634 with counter-pitched grooves.
  • In particular, the tissue removal element 634 is mounted to the distal end of the drive shaft 332, and takes the form of a cylindrically-shaped burr with proximal spiral cutting grooves 636 and distal spiral cutting grooves 638. The respective proximal and distal grooves 636 and 638 are oppositely pitched, such the removed tissue is force to travel along the grooves 636/638 towards the center of the burr 634 when rotated in a particular direction (in this case, clockwise if looking down the distal end of the burr 634). In this manner, the removed tissue will tend to be collected in one place, thereby making aspiration of the tissue easier.
  • Referring now to FIG. 26, yet another tissue removal probe 710 that can alternatively be used in the tissue removal system 100 will be described. The tissue removal probe 710 is similar to the previously described tissue removal probe 610 with the exception that two counter-rotating burrs are used.
  • In particular, the tissue removal probe 710 comprises an outer drive shaft 732 with a lumen 736, and an inner drive shaft 733 disposed within the outer drive shaft lumen 736. As such, the drive shafts 732 and 733 are independent, and can thus be rotated in opposite directions or the same direction. The tissue removal probe 710 further comprises proximal and distal removal elements 734 and 735 in the form of cylindrical burrs mounted to the distal ends of the respective drive shafts 732 and 733. The cylindrical burrs 734 and 735 are collinear and coextensive with each other, so that they can operate as a contiguous tissue removal device. Spiral cutting grooves 738 and 740 are formed in the surfaces of the respective burrs 734 and 735 In the illustrated embodiment, the absolute pitch of the spiral grooves 738 on the proximal burr 734 is the same as the absolute pitch on the distal burr 735. The grooves 738/740, however, are pitched in the opposite direction. Thus, rotation of the proximal burr 734 in one direction (by rotating the outer drive shaft 732 in that direction), and rotation of the distal burr 735 in the opposite direction (by rotating the inner drive shaft 733 in that direction) will stabilize the tissue removal probe 710 as it is laterally cutting through tissue, e.g., bone tissue. That is, the counter-rotating burrs 734/735 prevents, or at least minimizes, the tendency of the tissue removal probe 710 to stray from its intended cut path.
  • Alternatively, the burrs 734/735 can be rotated in the same direction, preferably in a direction that forces the removed tissue to travel along the grooves 738/740 of the respective burrs 734/735 towards the interface between the burrs 734/735. In this manner, the removed tissue will tend to be collected in one place, thereby making it more easily aspirated. Thus, it can be appreciated that the independence of the outer and inner drive shafts 732/733, allows the respective burrs 734/735 to be selectively rotated in opposite directions or rotated in the same direction.
  • Referring now to FIG. 27, yet another tissue removal probe 810 that can alternatively be used in the tissue removal system 100 will be described. The tissue removal probe 810 is similar to the previously described tissue removal probe 310 in that it comprises the sleeve 324, drive shaft 332, and proximal adapter 338. The tissue removal probe 810 differs from the tissue removal probe 310 in that it comprises a tissue removal element 834 configured to drill holes through bone, whereas the tissue removal element of the tissue removal probe 310, as well as those subsequently described in tissue removal probes 410, 510, 610, and 710, lend itself well to the lateral removal of hard bone tissue, e.g., during laminectomy and laminotomy procedures.
  • In particular, the tissue removal element 834 takes the form of a drill bit mounted at the distal end of the drive shaft 332. The drill bit 834 has a sharp distal tip 836 that allows the rotating drill bit 834 to penetrate or shape bone tissue. In the illustrated embodiment, the drill bit 834 has a length that is between ¼ and 1 inch, and a diameter that is between 1/100 and ½ inch. The drill bit 834 includes two fluted cutting grooves 838 that extend down opposite sides of the drill bit 834, as shown in FIG. 28.
  • Referring now to FIG. 29, yet another tissue removal probe 910 that can alternatively be used in the tissue removal system 100 will be described. Unlike in the previously described embodiments, which have rotatable tissue removal elements, the tissue removal probe 910 comprises a reciprocating tissue removal element. In particular, the tissue removal probe 910 comprises a rigid drive shaft 912 having a distal end 914, and a tissue removal element 934 formed on the distal end 914 of the drive shaft 912. The tissue removal element 934 comprise a block 936 with a series of cascading tissue-cutting notches 938 longitudinally formed along the block 934. As a result, a series of sharp leading edges 940 are formed along the block 934. In the illustrated embodiment, the block 936 has a rectangular cross-section.
  • Thus, it can be appreciated that the tissue removal element 934 can be placed within a hole or groove in a bone, and reciprocatably moved to remove bone tissue from the bone, thereby enlarging the hole. A motor can be configured to apply a hammering motion (i.e., a forward and rearward motion) to drive the shaft 912.
  • Although particular embodiments of the present invention have been shown and described, it should be understood that the above discussion is not intended to limit the present invention to these embodiments. It will be obvious to those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the present invention. In addition, an illustrated embodiment needs not have all the aspects or advantages of the invention shown. An aspect or an advantage described in conjunction with a particular embodiment of the present invention is not necessarily limited to that embodiment and can be practiced in any other embodiments of the present invention even if not so illustrated. Thus, the present invention is intended to cover alternatives, modifications, and equivalents that may fall within the spirit and scope of the present invention as defined by the claims.

Claims (44)

1. A tissue removal probe, comprising:
a laterally flexible and resilient elongated member having a lumen and a pre-curved distal end;
a drive shaft rotatably disposed within the member lumen;
a rotatable tissue removal element disposed on the drive shaft adjacent the member distal end, the tissue removal element having an axis of rotation.
2. The probe of claim 1, wherein the member distal end is pre-curved at approximately ninety degrees.
3. The probe of claim 1, wherein the tissue removal element comprises an abrasive burr.
4. The probe of claim 1, further comprising a proximal adapter mounted to the member, the proximal adapter configured for mating with a drive unit.
5. A tissue removal kit, comprising:
a cannula having a lumen; and
a tissue removal probe axially slidable within the cannula lumen, the tissue removal probe comprising:
an elongated member having a lumen and a distal end configured to curve when distally deployed from the cannula lumen;
a drive shaft rotatably disposed within the member lumen; and
a rotatable tissue removal element disposed on the drive shaft adjacent the member distal end, the tissue removal element having an axis of rotation.
6. The kit of claim 5, wherein the cannula is rigid.
7. The kit of claim 5, wherein the cannula has a tissue-penetrating distal tip.
8. The kit of claim 5, wherein the tissue removal probe is removably disposed within the cannula lumen.
9. The kit of claim 5, wherein the distal end of the cannula is curved.
10. The kit of claim 5, wherein the member distal end is pre-curved.
11. The kit of claim 5, wherein the tissue removal probe comprises at least one pull wire mounted to the member distal end.
12. The kit of claim 5, wherein the member is laterally flexible.
13. The kit of claim 5, wherein the member is laterally resilient.
14. The kit of claim 5, wherein the member distal end is configured to curve at approximately a ninety degree when distally deployed from the cannula lumen.
15. The kit of claim 5, wherein the tissue removal element comprises an abrasive burr.
16. The kit of claim 1, wherein the tissue removal probe further comprises a proximal adapter mounted to the member, the proximal adapter configured for mating with a drive unit.
17. A method of removing tissue from an anatomical body, comprising:
introducing a cannula into the anatomical body at a first location;
introducing a tissue removal probe through the cannula, wherein the tissue removal probe comprises an elongated member having a straight portion and a distal end, and a distally located tissue removal element associated with the distal end, the straight member portion having a first axis of rotation, and the tissue removal element having a second axis of rotation;
displacing the tissue removal element, wherein the member distal end bends to associate the tissue removal element with a first radius of revolution about the first axis of rotation;
rotating the straight member portion around the first axis of rotation, wherein the tissue removal element scribes a first arc defined by the first radius of revolution; and
rotating the tissue removal element about the second axis of rotation to remove tissue at at least two points along the first arc.
18. The method of claim 17, wherein the member distal end is pre-curved.
19. The method of claim 17, wherein the cannula distal end is curved.
20. The method of claim 17, wherein the tissue removal element is rotated while the straight member portion is rotated, whereby the tissue removal element continuously removes tissue along the first arc.
21. The method of claim 17, wherein the first arc forms a circle.
22. The method of claim 17, further comprising:
displacing the tissue removal element, wherein the member distal end bends to associate with tissue removal element with a second radius of revolution different from the first radius of revolution;
rotating the straight member portion around the first axis of rotation, wherein the tissue removal element scribes a second arc defined by the second radius of revolution; and
rotating the tissue removal element about the second axis of rotation to remove tissue at at least two points along the second arc.
23. The method of claim 22, wherein the second radius of revolution is greater than the first radius of revolution.
24. The method of claim 22, wherein the first and second arcs form circles.
25. The method of claim 24, wherein a solid disc of tissue is removed.
26. The method of claim 17, further comprising displacing the cannula along the first axis of rotation to a second location, and repeating the member distal end displacement, straight member portion rotation, and tissue removal element rotation steps.
27. The method of claim 24, further comprising displacing the cannula along the first axis of rotation to a second location, and repeating the member distal end displacement, straight member portion rotation, and tissue removal element rotation steps.
28. The method of claim 27, wherein a solid cylinder of tissue is removed.
29. The method of claim 17, wherein the member distal end bends at a ninety degree angle.
30. The method of claim 17, further comprising aspirating the removed tissue from the anatomical body.
31. The method of claim 17, wherein the anatomical body is an intervertebral disc.
32. The method of claim 17, wherein the anatomical body is a vertebral body.
33. The method of claim 17, wherein the tissue is bone tissue.
34. A method of removing tissue from an anatomical body, comprising:
introducing a cannula into the anatomical body at a first location;
introducing a tissue removal probe through the cannula, wherein the tissue removal probe comprises an elongated member having a distal end, and a distally located tissue removal element associated with the distal end and having an axis of rotation;
displacing the tissue removal element from the cannula to associate the tissue removal element with a first radius of curvature;
bending the member distal end, wherein the tissue removal element scribes a first arc defined by the first radius of curvature; and
rotating the tissue removal element about the axis of rotation to remove tissue at at least two points along the first arc.
35. The method of claim 34, wherein the tissue removal element is rotated while the tissue removal element scribes the first arc, whereby the tissue removal element continuously removes tissue along the first arc.
36. The method of claim 34, wherein the first arc forms a semi-circle.
37. The method of claim 34, further comprising:
displacing the tissue removal element from the cannula to associate the tissue removal element with a second radius of curvature;
bending the member distal end, wherein the tissue removal element scribes a second arc defined by the second radius of curvature; and
rotating the tissue removal element about the axis of rotation to remove tissue at at least two points along the second arc.
38. The method of claim 37, wherein the second distance is greater than the first distance.
39. The method of claim 37, wherein the first and second arcs form semi-circles.
40. The method of claim 37, wherein a solid radial sector of tissue is removed.
41. The method of claim 34, further comprising aspirating the removed tissue from the anatomical body.
42. The method of claim 34, wherein the anatomical body is an intervertebral disc.
43. The method of claim 34, wherein the anatomical body is a vertebral body.
44. The method of claim 34, wherein the tissue is bone tissue.
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Cited By (77)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20050197661A1 (en) * 2004-03-03 2005-09-08 Scimed Life Systems, Inc. Tissue removal probe with sliding burr in cutting window
US20050203527A1 (en) * 2004-03-03 2005-09-15 Scimed Life Systems, Inc. Apparatus and methods for removing vertebral bone and disc tissue
US20050261692A1 (en) * 2004-05-21 2005-11-24 Scimed Life Systems, Inc. Articulating tissue removal probe and methods of using the same
WO2006015302A1 (en) * 2004-07-29 2006-02-09 X-Sten, Corp. Spinal ligament modification devices
US20060254599A1 (en) * 2005-05-10 2006-11-16 Levin Bruce H Intervention techniques for post-laminectomy syndrome and other spinal disorders
US20070123890A1 (en) * 2005-11-04 2007-05-31 X-Sten, Corp. Tissue retrieval devices and methods
US20070129630A1 (en) * 2005-12-07 2007-06-07 Shimko Daniel A Imaging method, device and system
US20070135706A1 (en) * 2005-12-13 2007-06-14 Shimko Daniel A Debridement method, device and kit
US20070149975A1 (en) * 2005-11-29 2007-06-28 Oliver Dana A Method and apparatus for removing material from an intervertebral disc space, such as in performing a nucleotomy
WO2007142873A2 (en) * 2006-05-30 2007-12-13 Mako Surgical Corp. Surgical tool
US20080086157A1 (en) * 2006-06-30 2008-04-10 Depuy Spine, Inc. Disc Nucleus Removal Devices and Methods
US20080255563A1 (en) * 2006-11-03 2008-10-16 Innovative Spine Instrumentation and method for providing surgical access to a spine
USD610259S1 (en) 2008-10-23 2010-02-16 Vertos Medical, Inc. Tissue modification device
USD611146S1 (en) 2008-10-23 2010-03-02 Vertos Medical, Inc. Tissue modification device
US7738968B2 (en) 2004-10-15 2010-06-15 Baxano, Inc. Devices and methods for selective surgical removal of tissue
US7738969B2 (en) 2004-10-15 2010-06-15 Baxano, Inc. Devices and methods for selective surgical removal of tissue
USD619253S1 (en) 2008-10-23 2010-07-06 Vertos Medical, Inc. Tissue modification device
USD619252S1 (en) 2008-10-23 2010-07-06 Vertos Medical, Inc. Tissue modification device
USD620593S1 (en) 2006-07-31 2010-07-27 Vertos Medical, Inc. Tissue excision device
USD621939S1 (en) 2008-10-23 2010-08-17 Vertos Medical, Inc. Tissue modification device
US20100249758A1 (en) * 2009-03-27 2010-09-30 Depuy Mitek, Inc. Methods and devices for preparing and implanting tissue scaffolds
US20100249801A1 (en) * 2009-03-27 2010-09-30 Depuy Mitek, Inc. Methods and devices for delivering and affixing tissue scaffolds
US7857813B2 (en) 2006-08-29 2010-12-28 Baxano, Inc. Tissue access guidewire system and method
US7887538B2 (en) 2005-10-15 2011-02-15 Baxano, Inc. Methods and apparatus for tissue modification
USD635671S1 (en) 2008-10-23 2011-04-05 Vertos Medical, Inc. Tissue modification device
US7918849B2 (en) 2004-10-15 2011-04-05 Baxano, Inc. Devices and methods for tissue access
US7938830B2 (en) 2004-10-15 2011-05-10 Baxano, Inc. Powered tissue modification devices and methods
US7942830B2 (en) 2006-05-09 2011-05-17 Vertos Medical, Inc. Ipsilateral approach to minimally invasive ligament decompression procedure
US7959577B2 (en) 2007-09-06 2011-06-14 Baxano, Inc. Method, system, and apparatus for neural localization
US8048080B2 (en) 2004-10-15 2011-11-01 Baxano, Inc. Flexible tissue rasp
US8062300B2 (en) 2006-05-04 2011-11-22 Baxano, Inc. Tissue removal with at least partially flexible devices
US8062298B2 (en) 2005-10-15 2011-11-22 Baxano, Inc. Flexible tissue removal devices and methods
US8092456B2 (en) 2005-10-15 2012-01-10 Baxano, Inc. Multiple pathways for spinal nerve root decompression from a single access point
US8109958B1 (en) * 2006-06-01 2012-02-07 Neville Alleyne Method and apparatus for spinal osteoligamentous resection
US8192436B2 (en) 2007-12-07 2012-06-05 Baxano, Inc. Tissue modification devices
US8221397B2 (en) 2004-10-15 2012-07-17 Baxano, Inc. Devices and methods for tissue modification
US8257356B2 (en) 2004-10-15 2012-09-04 Baxano, Inc. Guidewire exchange systems to treat spinal stenosis
US8366712B2 (en) 2005-10-15 2013-02-05 Baxano, Inc. Multiple pathways for spinal nerve root decompression from a single access point
US8394102B2 (en) 2009-06-25 2013-03-12 Baxano, Inc. Surgical tools for treatment of spinal stenosis
US8398641B2 (en) 2008-07-01 2013-03-19 Baxano, Inc. Tissue modification devices and methods
US8409206B2 (en) 2008-07-01 2013-04-02 Baxano, Inc. Tissue modification devices and methods
US8414606B2 (en) 2010-10-22 2013-04-09 Medtronic Xomed, Inc. Method and apparatus for removing material from an intervertebral disc space and preparing end plates
US8419653B2 (en) 2005-05-16 2013-04-16 Baxano, Inc. Spinal access and neural localization
US8430881B2 (en) 2004-10-15 2013-04-30 Baxano, Inc. Mechanical tissue modification devices and methods
US20130184738A1 (en) * 2012-01-13 2013-07-18 Crux Biomedical, Inc. Retrieval snare device and method
US8568416B2 (en) 2004-10-15 2013-10-29 Baxano Surgical, Inc. Access and tissue modification systems and methods
US20130310869A1 (en) * 2012-04-28 2013-11-21 Physcient, Inc. Methods and devices for soft tissue dissection
US8613745B2 (en) 2004-10-15 2013-12-24 Baxano Surgical, Inc. Methods, systems and devices for carpal tunnel release
JP2014061342A (en) * 2006-10-14 2014-04-10 Saleh Rafic Surgical retrieval device and method
US8696671B2 (en) 2005-07-29 2014-04-15 Vertos Medical Inc. Percutaneous tissue excision devices
US8801626B2 (en) 2004-10-15 2014-08-12 Baxano Surgical, Inc. Flexible neural localization devices and methods
US20140276832A1 (en) * 2013-03-14 2014-09-18 Nadi Salah Hibri Surgical Device
US8840621B2 (en) 2006-11-03 2014-09-23 Innovative Spine, Inc. Spinal access systems and methods
WO2014149863A1 (en) * 2013-03-15 2014-09-25 DePuy Synthes Products, LLC Tools for tissue removal
US8845639B2 (en) 2008-07-14 2014-09-30 Baxano Surgical, Inc. Tissue modification devices
US9101386B2 (en) 2004-10-15 2015-08-11 Amendia, Inc. Devices and methods for treating tissue
US9247952B2 (en) 2004-10-15 2016-02-02 Amendia, Inc. Devices and methods for tissue access
US9314253B2 (en) 2008-07-01 2016-04-19 Amendia, Inc. Tissue modification devices and methods
US9456829B2 (en) 2004-10-15 2016-10-04 Amendia, Inc. Powered tissue modification devices and methods
US9592069B2 (en) 2012-04-28 2017-03-14 Physcient, Inc. Methods and devices for soft tissue dissection
US9629646B2 (en) 2012-07-11 2017-04-25 Jens Kather Curved burr surgical instrument
EP2317940A4 (en) * 2008-07-25 2017-05-24 Spine View, Inc. Systems and methods for cable-based debriders
EP2046207A4 (en) * 2006-07-13 2017-08-23 K2M, Inc. Devices and methods for stabilizing a spinal region
US20170238948A1 (en) * 2016-02-23 2017-08-24 Terumo Kabushiki Kaisha Medical device and method for treatment
US10080571B2 (en) 2015-03-06 2018-09-25 Warsaw Orthopedic, Inc. Surgical instrument and method
US20180368880A1 (en) * 2017-05-31 2018-12-27 Terumo Kabushiki Kaisha Device handle for a medical device
US20190029698A1 (en) * 2008-09-26 2019-01-31 Relievant Medsystems, Inc. Bipolar radiofrequency ablation systems for treatment within bone
US10383651B2 (en) 2014-04-22 2019-08-20 Physcient, Inc. Instruments, devices, and related methods for soft tissue dissection
AU2018282379B2 (en) * 2009-03-27 2019-09-26 Depuy Mitek, Inc. Methods and devices for preparing and implanting tissue scaffolds
US10582942B2 (en) 2014-04-18 2020-03-10 Physcient, Inc. Methods and devices for soft tissue dissection
WO2020089415A1 (en) * 2018-11-01 2020-05-07 Koninklijke Philips N.V. Atherectomy devices including pre-shaped and curved distal portions and methods
US11234764B1 (en) 2012-11-05 2022-02-01 Relievant Medsystems, Inc. Systems for navigation and treatment within a vertebral body
US11389191B2 (en) 2017-05-31 2022-07-19 Terumo Kabushiki Kaisha Device handle for a medical device
US11426199B2 (en) 2019-09-12 2022-08-30 Relievant Medsystems, Inc. Methods of treating a vertebral body
US11471210B2 (en) 2011-12-30 2022-10-18 Relievant Medsystems, Inc. Methods of denervating vertebral body using external energy source
US11596468B2 (en) * 2002-09-30 2023-03-07 Relievant Medsystems, Inc. Intraosseous nerve treatment
US11690667B2 (en) 2012-09-12 2023-07-04 Relievant Medsystems, Inc. Radiofrequency ablation of tissue within a vertebral body

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20080188826A1 (en) * 2007-02-01 2008-08-07 Laurimed, Llc Methods and devices for treating tissue
US8685052B2 (en) 2010-06-30 2014-04-01 Laurimed, Llc Devices and methods for cutting tissue
WO2013119336A1 (en) 2012-02-10 2013-08-15 Laurimed, Llc Vacuum powered rotary devices and methods
US8815099B1 (en) 2014-01-21 2014-08-26 Laurimed, Llc Devices and methods for filtering and/or collecting tissue
US9901364B2 (en) 2014-02-20 2018-02-27 Gyrus Acmi, Inc. Heat pipe cooled burr including surgical instruments embodying same
CN110573099B (en) 2017-05-03 2023-01-03 美敦力瓦斯科尔勒公司 Tissue removal catheter
US11690645B2 (en) 2017-05-03 2023-07-04 Medtronic Vascular, Inc. Tissue-removing catheter
US11819236B2 (en) 2019-05-17 2023-11-21 Medtronic Vascular, Inc. Tissue-removing catheter

Citations (53)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3732858A (en) * 1968-09-16 1973-05-15 Surgical Design Corp Apparatus for removing blood clots, cataracts and other objects from the eye
US4733663A (en) * 1986-07-02 1988-03-29 Farley Daniel K Medical instrument for removing bone
US4850957A (en) * 1988-01-11 1989-07-25 American Biomed, Inc. Atherectomy catheter
US4983179A (en) * 1986-12-30 1991-01-08 Smith & Nephew Dyonics Inc. Arthroscopic surgical instrument
US5007917A (en) * 1990-03-08 1991-04-16 Stryker Corporation Single blade cutter for arthroscopic surgery
US5019088A (en) * 1989-11-07 1991-05-28 Interventional Technologies Inc. Ovoid atherectomy cutter
US5030201A (en) * 1989-11-24 1991-07-09 Aubrey Palestrant Expandable atherectomy catheter device
US5242441A (en) * 1992-02-24 1993-09-07 Boaz Avitall Deflectable catheter with rotatable tip electrode
US5242418A (en) * 1992-05-22 1993-09-07 Weinstein James D Protective means for a needle or similar cannula medical device
US5269785A (en) * 1990-06-28 1993-12-14 Bonutti Peter M Apparatus and method for tissue removal
US5312427A (en) * 1992-10-16 1994-05-17 Shturman Cardiology Systems, Inc. Device and method for directional rotational atherectomy
US5356418A (en) * 1992-10-28 1994-10-18 Shturman Cardiology Systems, Inc. Apparatus and method for rotational atherectomy
US5360432A (en) * 1992-10-16 1994-11-01 Shturman Cardiology Systems, Inc. Abrasive drive shaft device for directional rotational atherectomy
US5376100A (en) * 1991-12-23 1994-12-27 Lefebvre; Jean-Marie Rotary atherectomy or thrombectomy device with centrifugal transversal expansion
US5441510A (en) * 1993-09-01 1995-08-15 Technology Development Center Bi-axial cutter apparatus for catheter
US5630823A (en) * 1994-06-17 1997-05-20 William Cook Europe A/S Apparatus for fragmentation of a lung or heart embolus
US5836947A (en) * 1994-10-07 1998-11-17 Ep Technologies, Inc. Flexible structures having movable splines for supporting electrode elements
US5843103A (en) * 1997-03-06 1998-12-01 Scimed Life Systems, Inc. Shaped wire rotational atherectomy device
US5849023A (en) * 1996-12-27 1998-12-15 Mericle; Robert William Disposable remote flexible drive cutting apparatus
US5857995A (en) * 1996-08-15 1999-01-12 Surgical Dynamics, Inc. Multiple bladed surgical cutting device removably connected to a rotary drive element
US5913867A (en) * 1996-12-23 1999-06-22 Smith & Nephew, Inc. Surgical instrument
US5925056A (en) * 1996-04-12 1999-07-20 Surgical Dynamics, Inc. Surgical cutting device removably connected to a rotary drive element
US6120515A (en) * 1996-02-06 2000-09-19 Devices For Vascular Intervention, Inc. Composite atherectomy cutter
US6156040A (en) * 1997-08-29 2000-12-05 Sulzer Spine-Tech Inc. Apparatus and method for spinal stablization
US6228022B1 (en) * 1998-10-28 2001-05-08 Sdgi Holdings, Inc. Methods and instruments for spinal surgery
US6251120B1 (en) * 1998-11-03 2001-06-26 Karl Storz Gmbh & Co., Kg Medical instrument for removing tissue
US6270498B1 (en) * 1988-06-13 2001-08-07 Gary Karlin Michelson Apparatus for inserting spinal implants
US6280447B1 (en) * 1998-12-23 2001-08-28 Nuvasive, Inc. Bony tissue resector
US6527065B1 (en) * 2000-08-30 2003-03-04 Baker Hughes Incorporated Superabrasive cutting elements for rotary drag bits configured for scooping a formation
US20030055404A1 (en) * 2001-09-17 2003-03-20 Moutafis Timothy E. Endoscopic rotary abraders
US6540741B1 (en) * 1996-07-16 2003-04-01 Arthrocare Corporation Systems and methods for electrosurgical spine surgery
US6575981B1 (en) * 1999-02-04 2003-06-10 Sdgi Holdings, Inc. Methods and instrumentation for vertebral interbody fusion
US6582437B2 (en) * 1999-08-26 2003-06-24 Sdgi Holdings, Inc. Devices and methods for implanting fusion cages
US6596005B1 (en) * 1998-03-05 2003-07-22 Scimed Life Systems, Inc. Steerable ablation burr
US6599291B1 (en) * 2000-10-20 2003-07-29 Sdgi Holdings, Inc. Methods and instruments for interbody surgical techniques
US6610065B1 (en) * 1998-10-28 2003-08-26 Sdgi Holdings, Inc. Interbody fusion implants and instrumentation
US6648895B2 (en) * 2000-02-04 2003-11-18 Sdgi Holdings, Inc. Methods and instrumentation for vertebral interbody fusion
US6740090B1 (en) * 2000-02-16 2004-05-25 Trans1 Inc. Methods and apparatus for forming shaped axial bores through spinal vertebrae
US6746451B2 (en) * 2001-06-01 2004-06-08 Lance M. Middleton Tissue cavitation device and method
US20040147934A1 (en) * 2002-10-18 2004-07-29 Kiester P. Douglas Oscillating, steerable, surgical burring tool and method of using the same
US6818001B2 (en) * 2000-04-05 2004-11-16 Pathway Medical Technologies, Inc. Intralumenal material removal systems and methods
US20050054972A1 (en) * 2003-09-09 2005-03-10 Adams Kenneth M. Surgical micro-burring instrument and method of performing sinus surgery
US6893450B2 (en) * 1999-03-26 2005-05-17 Cook Urological Incorporated Minimally-invasive medical retrieval device
US20050165420A1 (en) * 2003-12-19 2005-07-28 Cha Charles W. Dissecting high speed burr for spinal surgery
US20050197661A1 (en) * 2004-03-03 2005-09-08 Scimed Life Systems, Inc. Tissue removal probe with sliding burr in cutting window
US20050203527A1 (en) * 2004-03-03 2005-09-15 Scimed Life Systems, Inc. Apparatus and methods for removing vertebral bone and disc tissue
US20050209622A1 (en) * 2004-03-03 2005-09-22 Scimed Life Systems, Inc. Tissue removal probe with irrigation and aspiration ports
US20050261692A1 (en) * 2004-05-21 2005-11-24 Scimed Life Systems, Inc. Articulating tissue removal probe and methods of using the same
US20060004369A1 (en) * 2004-06-17 2006-01-05 Scimed Life Systems, Inc. Slidable sheaths for tissue removal devices
US7077845B2 (en) * 2003-03-11 2006-07-18 Arthrex, Inc. Surgical abrader with suction port proximal to bearing
US20070010826A1 (en) * 2003-07-31 2007-01-11 Rhoda William S Posterior prosthetic spinal disc replacement and methods thereof
US7316697B2 (en) * 1999-02-02 2008-01-08 Samuel Shiber Vessel cleaning system with asymmetrical auto retracting agitator
US7318826B2 (en) * 2002-11-08 2008-01-15 Sdgi Holdings, Inc. Transpedicular intervertebral disk access methods and devices

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4445509A (en) 1982-02-04 1984-05-01 Auth David C Method and apparatus for removal of enclosed abnormal deposits
GB9124423D0 (en) 1991-11-16 1992-01-08 Strover Angus E Surgical tool
US5487757A (en) * 1993-07-20 1996-01-30 Medtronic Cardiorhythm Multicurve deflectable catheter
US5554163A (en) * 1995-04-27 1996-09-10 Shturman Cardiology Systems, Inc. Atherectomy device
FR2811538B1 (en) 2000-07-12 2003-02-07 Spine Next Sa INTERVERTEBRAL CUTTING TOOL
US6752767B2 (en) * 2002-04-16 2004-06-22 Vivant Medical, Inc. Localization element with energized tip
US20080045881A1 (en) * 2004-03-26 2008-02-21 University Of Southern California Devices and methods for removing a matter from a body cavity of a patient

Patent Citations (54)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3732858A (en) * 1968-09-16 1973-05-15 Surgical Design Corp Apparatus for removing blood clots, cataracts and other objects from the eye
US4733663A (en) * 1986-07-02 1988-03-29 Farley Daniel K Medical instrument for removing bone
US4983179A (en) * 1986-12-30 1991-01-08 Smith & Nephew Dyonics Inc. Arthroscopic surgical instrument
US4850957A (en) * 1988-01-11 1989-07-25 American Biomed, Inc. Atherectomy catheter
US6270498B1 (en) * 1988-06-13 2001-08-07 Gary Karlin Michelson Apparatus for inserting spinal implants
US5019088A (en) * 1989-11-07 1991-05-28 Interventional Technologies Inc. Ovoid atherectomy cutter
US5030201A (en) * 1989-11-24 1991-07-09 Aubrey Palestrant Expandable atherectomy catheter device
US5007917A (en) * 1990-03-08 1991-04-16 Stryker Corporation Single blade cutter for arthroscopic surgery
US5269785A (en) * 1990-06-28 1993-12-14 Bonutti Peter M Apparatus and method for tissue removal
US5376100A (en) * 1991-12-23 1994-12-27 Lefebvre; Jean-Marie Rotary atherectomy or thrombectomy device with centrifugal transversal expansion
US5242441A (en) * 1992-02-24 1993-09-07 Boaz Avitall Deflectable catheter with rotatable tip electrode
US5242418A (en) * 1992-05-22 1993-09-07 Weinstein James D Protective means for a needle or similar cannula medical device
US5312427A (en) * 1992-10-16 1994-05-17 Shturman Cardiology Systems, Inc. Device and method for directional rotational atherectomy
US5360432A (en) * 1992-10-16 1994-11-01 Shturman Cardiology Systems, Inc. Abrasive drive shaft device for directional rotational atherectomy
US5356418A (en) * 1992-10-28 1994-10-18 Shturman Cardiology Systems, Inc. Apparatus and method for rotational atherectomy
US5441510A (en) * 1993-09-01 1995-08-15 Technology Development Center Bi-axial cutter apparatus for catheter
US5630823A (en) * 1994-06-17 1997-05-20 William Cook Europe A/S Apparatus for fragmentation of a lung or heart embolus
US5836947A (en) * 1994-10-07 1998-11-17 Ep Technologies, Inc. Flexible structures having movable splines for supporting electrode elements
US6120515A (en) * 1996-02-06 2000-09-19 Devices For Vascular Intervention, Inc. Composite atherectomy cutter
US5925056A (en) * 1996-04-12 1999-07-20 Surgical Dynamics, Inc. Surgical cutting device removably connected to a rotary drive element
US5968062A (en) * 1996-04-12 1999-10-19 Surgical Dynamics, Inc. Surgical cutting device removeably connected to a rotarty drive element
US6540741B1 (en) * 1996-07-16 2003-04-01 Arthrocare Corporation Systems and methods for electrosurgical spine surgery
US5857995A (en) * 1996-08-15 1999-01-12 Surgical Dynamics, Inc. Multiple bladed surgical cutting device removably connected to a rotary drive element
US5913867A (en) * 1996-12-23 1999-06-22 Smith & Nephew, Inc. Surgical instrument
US5849023A (en) * 1996-12-27 1998-12-15 Mericle; Robert William Disposable remote flexible drive cutting apparatus
US5843103A (en) * 1997-03-06 1998-12-01 Scimed Life Systems, Inc. Shaped wire rotational atherectomy device
US6156040A (en) * 1997-08-29 2000-12-05 Sulzer Spine-Tech Inc. Apparatus and method for spinal stablization
US6596005B1 (en) * 1998-03-05 2003-07-22 Scimed Life Systems, Inc. Steerable ablation burr
US6228022B1 (en) * 1998-10-28 2001-05-08 Sdgi Holdings, Inc. Methods and instruments for spinal surgery
US6610065B1 (en) * 1998-10-28 2003-08-26 Sdgi Holdings, Inc. Interbody fusion implants and instrumentation
US6251120B1 (en) * 1998-11-03 2001-06-26 Karl Storz Gmbh & Co., Kg Medical instrument for removing tissue
US6280447B1 (en) * 1998-12-23 2001-08-28 Nuvasive, Inc. Bony tissue resector
US7316697B2 (en) * 1999-02-02 2008-01-08 Samuel Shiber Vessel cleaning system with asymmetrical auto retracting agitator
US6575981B1 (en) * 1999-02-04 2003-06-10 Sdgi Holdings, Inc. Methods and instrumentation for vertebral interbody fusion
US6893450B2 (en) * 1999-03-26 2005-05-17 Cook Urological Incorporated Minimally-invasive medical retrieval device
US6582437B2 (en) * 1999-08-26 2003-06-24 Sdgi Holdings, Inc. Devices and methods for implanting fusion cages
US6648895B2 (en) * 2000-02-04 2003-11-18 Sdgi Holdings, Inc. Methods and instrumentation for vertebral interbody fusion
US6740090B1 (en) * 2000-02-16 2004-05-25 Trans1 Inc. Methods and apparatus for forming shaped axial bores through spinal vertebrae
US6818001B2 (en) * 2000-04-05 2004-11-16 Pathway Medical Technologies, Inc. Intralumenal material removal systems and methods
US6527065B1 (en) * 2000-08-30 2003-03-04 Baker Hughes Incorporated Superabrasive cutting elements for rotary drag bits configured for scooping a formation
US6599291B1 (en) * 2000-10-20 2003-07-29 Sdgi Holdings, Inc. Methods and instruments for interbody surgical techniques
US6746451B2 (en) * 2001-06-01 2004-06-08 Lance M. Middleton Tissue cavitation device and method
US20030055404A1 (en) * 2001-09-17 2003-03-20 Moutafis Timothy E. Endoscopic rotary abraders
US20040147934A1 (en) * 2002-10-18 2004-07-29 Kiester P. Douglas Oscillating, steerable, surgical burring tool and method of using the same
US7318826B2 (en) * 2002-11-08 2008-01-15 Sdgi Holdings, Inc. Transpedicular intervertebral disk access methods and devices
US7077845B2 (en) * 2003-03-11 2006-07-18 Arthrex, Inc. Surgical abrader with suction port proximal to bearing
US20070010826A1 (en) * 2003-07-31 2007-01-11 Rhoda William S Posterior prosthetic spinal disc replacement and methods thereof
US20050054972A1 (en) * 2003-09-09 2005-03-10 Adams Kenneth M. Surgical micro-burring instrument and method of performing sinus surgery
US20050165420A1 (en) * 2003-12-19 2005-07-28 Cha Charles W. Dissecting high speed burr for spinal surgery
US20050209622A1 (en) * 2004-03-03 2005-09-22 Scimed Life Systems, Inc. Tissue removal probe with irrigation and aspiration ports
US20050203527A1 (en) * 2004-03-03 2005-09-15 Scimed Life Systems, Inc. Apparatus and methods for removing vertebral bone and disc tissue
US20050197661A1 (en) * 2004-03-03 2005-09-08 Scimed Life Systems, Inc. Tissue removal probe with sliding burr in cutting window
US20050261692A1 (en) * 2004-05-21 2005-11-24 Scimed Life Systems, Inc. Articulating tissue removal probe and methods of using the same
US20060004369A1 (en) * 2004-06-17 2006-01-05 Scimed Life Systems, Inc. Slidable sheaths for tissue removal devices

Cited By (149)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11596468B2 (en) * 2002-09-30 2023-03-07 Relievant Medsystems, Inc. Intraosseous nerve treatment
US9474536B2 (en) 2004-03-03 2016-10-25 Boston Scientific Scimed, Inc. Apparatus and methods for removing vertebral bone and disc tissue
US20050203527A1 (en) * 2004-03-03 2005-09-15 Scimed Life Systems, Inc. Apparatus and methods for removing vertebral bone and disc tissue
US20050197661A1 (en) * 2004-03-03 2005-09-08 Scimed Life Systems, Inc. Tissue removal probe with sliding burr in cutting window
US8784421B2 (en) 2004-03-03 2014-07-22 Boston Scientific Scimed, Inc. Apparatus and methods for removing vertebral bone and disc tissue
US20050261692A1 (en) * 2004-05-21 2005-11-24 Scimed Life Systems, Inc. Articulating tissue removal probe and methods of using the same
WO2006015302A1 (en) * 2004-07-29 2006-02-09 X-Sten, Corp. Spinal ligament modification devices
US7896879B2 (en) 2004-07-29 2011-03-01 Vertos Medical, Inc. Spinal ligament modification
US7938830B2 (en) 2004-10-15 2011-05-10 Baxano, Inc. Powered tissue modification devices and methods
US8647346B2 (en) 2004-10-15 2014-02-11 Baxano Surgical, Inc. Devices and methods for tissue modification
US10052116B2 (en) 2004-10-15 2018-08-21 Amendia, Inc. Devices and methods for treating tissue
US9463041B2 (en) 2004-10-15 2016-10-11 Amendia, Inc. Devices and methods for tissue access
US9456829B2 (en) 2004-10-15 2016-10-04 Amendia, Inc. Powered tissue modification devices and methods
US9345491B2 (en) 2004-10-15 2016-05-24 Amendia, Inc. Flexible tissue rasp
US9320618B2 (en) 2004-10-15 2016-04-26 Amendia, Inc. Access and tissue modification systems and methods
US9247952B2 (en) 2004-10-15 2016-02-02 Amendia, Inc. Devices and methods for tissue access
US8221397B2 (en) 2004-10-15 2012-07-17 Baxano, Inc. Devices and methods for tissue modification
US7738968B2 (en) 2004-10-15 2010-06-15 Baxano, Inc. Devices and methods for selective surgical removal of tissue
US7738969B2 (en) 2004-10-15 2010-06-15 Baxano, Inc. Devices and methods for selective surgical removal of tissue
US7740631B2 (en) 2004-10-15 2010-06-22 Baxano, Inc. Devices and methods for tissue modification
US9101386B2 (en) 2004-10-15 2015-08-11 Amendia, Inc. Devices and methods for treating tissue
US8257356B2 (en) 2004-10-15 2012-09-04 Baxano, Inc. Guidewire exchange systems to treat spinal stenosis
US8048080B2 (en) 2004-10-15 2011-11-01 Baxano, Inc. Flexible tissue rasp
US8801626B2 (en) 2004-10-15 2014-08-12 Baxano Surgical, Inc. Flexible neural localization devices and methods
US11382647B2 (en) 2004-10-15 2022-07-12 Spinal Elements, Inc. Devices and methods for treating tissue
US8430881B2 (en) 2004-10-15 2013-04-30 Baxano, Inc. Mechanical tissue modification devices and methods
US8652138B2 (en) 2004-10-15 2014-02-18 Baxano Surgical, Inc. Flexible tissue rasp
US7963915B2 (en) * 2004-10-15 2011-06-21 Baxano, Inc. Devices and methods for tissue access
US8568416B2 (en) 2004-10-15 2013-10-29 Baxano Surgical, Inc. Access and tissue modification systems and methods
US8579902B2 (en) 2004-10-15 2013-11-12 Baxano Signal, Inc. Devices and methods for tissue modification
US8617163B2 (en) 2004-10-15 2013-12-31 Baxano Surgical, Inc. Methods, systems and devices for carpal tunnel release
US7918849B2 (en) 2004-10-15 2011-04-05 Baxano, Inc. Devices and methods for tissue access
US8613745B2 (en) 2004-10-15 2013-12-24 Baxano Surgical, Inc. Methods, systems and devices for carpal tunnel release
US8192435B2 (en) 2004-10-15 2012-06-05 Baxano, Inc. Devices and methods for tissue modification
US20060254599A1 (en) * 2005-05-10 2006-11-16 Levin Bruce H Intervention techniques for post-laminectomy syndrome and other spinal disorders
US8419653B2 (en) 2005-05-16 2013-04-16 Baxano, Inc. Spinal access and neural localization
US8696671B2 (en) 2005-07-29 2014-04-15 Vertos Medical Inc. Percutaneous tissue excision devices
US8882772B2 (en) 2005-07-29 2014-11-11 Vertos Medical, Inc. Percutaneous tissue excision devices and methods
US8894653B2 (en) 2005-07-29 2014-11-25 Vertos Medical, Inc. Percutaneous tissue excision devices and methods
US7887538B2 (en) 2005-10-15 2011-02-15 Baxano, Inc. Methods and apparatus for tissue modification
US9492151B2 (en) 2005-10-15 2016-11-15 Amendia, Inc. Multiple pathways for spinal nerve root decompression from a single access point
US8366712B2 (en) 2005-10-15 2013-02-05 Baxano, Inc. Multiple pathways for spinal nerve root decompression from a single access point
US8062298B2 (en) 2005-10-15 2011-11-22 Baxano, Inc. Flexible tissue removal devices and methods
US8092456B2 (en) 2005-10-15 2012-01-10 Baxano, Inc. Multiple pathways for spinal nerve root decompression from a single access point
US9125682B2 (en) 2005-10-15 2015-09-08 Amendia, Inc. Multiple pathways for spinal nerve root decompression from a single access point
US20070123890A1 (en) * 2005-11-04 2007-05-31 X-Sten, Corp. Tissue retrieval devices and methods
US20110166576A1 (en) * 2005-11-29 2011-07-07 Medtronic Xomed, Inc. Method and apparatus for removing material from an intervertebral disc space, such as in performing a nucleotomy
US7927361B2 (en) * 2005-11-29 2011-04-19 Medtronic Xomed, Inc. Method and apparatus for removing material from an intervertebral disc space, such as in performing a nucleotomy
US20070149975A1 (en) * 2005-11-29 2007-06-28 Oliver Dana A Method and apparatus for removing material from an intervertebral disc space, such as in performing a nucleotomy
US20080058641A1 (en) * 2005-12-07 2008-03-06 Shimko Daniel A Imaging method, device and system
US20070129630A1 (en) * 2005-12-07 2007-06-07 Shimko Daniel A Imaging method, device and system
US20070135706A1 (en) * 2005-12-13 2007-06-14 Shimko Daniel A Debridement method, device and kit
US8062300B2 (en) 2006-05-04 2011-11-22 Baxano, Inc. Tissue removal with at least partially flexible devices
US8585704B2 (en) 2006-05-04 2013-11-19 Baxano Surgical, Inc. Flexible tissue removal devices and methods
US9351741B2 (en) 2006-05-04 2016-05-31 Amendia, Inc. Flexible tissue removal devices and methods
US8734477B2 (en) 2006-05-09 2014-05-27 Vertos Medical, Inc. Translaminar approach to minimally invasive ligament decompression procedure
US8608762B2 (en) 2006-05-09 2013-12-17 Vertos Medical, Inc. Translaminar approach to minimally invasive ligament decompression procedure
US7942830B2 (en) 2006-05-09 2011-05-17 Vertos Medical, Inc. Ipsilateral approach to minimally invasive ligament decompression procedure
WO2007142873A3 (en) * 2006-05-30 2008-01-31 Mako Surgical Corp Surgical tool
WO2007142873A2 (en) * 2006-05-30 2007-12-13 Mako Surgical Corp. Surgical tool
US20080281343A1 (en) * 2006-05-30 2008-11-13 Mako Surgical Corp. Surgical tool
US8109958B1 (en) * 2006-06-01 2012-02-07 Neville Alleyne Method and apparatus for spinal osteoligamentous resection
US8377087B2 (en) 2006-06-01 2013-02-19 Elite I.P., Inc. Method and apparatus for spinal osteoligamentous resection
US8109957B2 (en) 2006-06-30 2012-02-07 Depuy Spine, Inc. Disc nucleus removal devices and methods
US20080086157A1 (en) * 2006-06-30 2008-04-10 Depuy Spine, Inc. Disc Nucleus Removal Devices and Methods
US11638592B2 (en) 2006-06-30 2023-05-02 DePuy Synthes Products, Inc. Disc nucleus removal devices and methods
US9173673B2 (en) 2006-06-30 2015-11-03 DePuy Synthes Products, Inc. Disc nucleus removal devices and methods
US10052123B2 (en) 2006-06-30 2018-08-21 DePuy Synthes Products, Inc. Disc nucleus removal devices and methods
EP2046207A4 (en) * 2006-07-13 2017-08-23 K2M, Inc. Devices and methods for stabilizing a spinal region
USD620593S1 (en) 2006-07-31 2010-07-27 Vertos Medical, Inc. Tissue excision device
US8845637B2 (en) 2006-08-29 2014-09-30 Baxano Surgical, Inc. Tissue access guidewire system and method
US8551097B2 (en) 2006-08-29 2013-10-08 Baxano Surgical, Inc. Tissue access guidewire system and method
US7857813B2 (en) 2006-08-29 2010-12-28 Baxano, Inc. Tissue access guidewire system and method
JP2014061342A (en) * 2006-10-14 2014-04-10 Saleh Rafic Surgical retrieval device and method
US20080255563A1 (en) * 2006-11-03 2008-10-16 Innovative Spine Instrumentation and method for providing surgical access to a spine
US8840621B2 (en) 2006-11-03 2014-09-23 Innovative Spine, Inc. Spinal access systems and methods
US8057481B2 (en) 2006-11-03 2011-11-15 Innovative Spine, Llc System and method for providing surgical access to a spine
US8632550B2 (en) 2006-11-03 2014-01-21 Innovative Spine LLC. System and method for providing surgical access to a spine
US8025664B2 (en) 2006-11-03 2011-09-27 Innovative Spine, Llc System and method for providing surgical access to a spine
US8597299B2 (en) 2006-11-03 2013-12-03 Innovative Spine, Llc Instrumentation and method for providing surgical access to a spine
US7959577B2 (en) 2007-09-06 2011-06-14 Baxano, Inc. Method, system, and apparatus for neural localization
US8303516B2 (en) 2007-09-06 2012-11-06 Baxano, Inc. Method, system and apparatus for neural localization
US9463029B2 (en) 2007-12-07 2016-10-11 Amendia, Inc. Tissue modification devices
US8663228B2 (en) 2007-12-07 2014-03-04 Baxano Surgical, Inc. Tissue modification devices
US8192436B2 (en) 2007-12-07 2012-06-05 Baxano, Inc. Tissue modification devices
US8409206B2 (en) 2008-07-01 2013-04-02 Baxano, Inc. Tissue modification devices and methods
US8398641B2 (en) 2008-07-01 2013-03-19 Baxano, Inc. Tissue modification devices and methods
US9314253B2 (en) 2008-07-01 2016-04-19 Amendia, Inc. Tissue modification devices and methods
US8845639B2 (en) 2008-07-14 2014-09-30 Baxano Surgical, Inc. Tissue modification devices
EP2317940A4 (en) * 2008-07-25 2017-05-24 Spine View, Inc. Systems and methods for cable-based debriders
US20190029698A1 (en) * 2008-09-26 2019-01-31 Relievant Medsystems, Inc. Bipolar radiofrequency ablation systems for treatment within bone
US11471171B2 (en) * 2008-09-26 2022-10-18 Relievant Medsystems, Inc. Bipolar radiofrequency ablation systems for treatment within bone
USD611146S1 (en) 2008-10-23 2010-03-02 Vertos Medical, Inc. Tissue modification device
USD619253S1 (en) 2008-10-23 2010-07-06 Vertos Medical, Inc. Tissue modification device
USD635671S1 (en) 2008-10-23 2011-04-05 Vertos Medical, Inc. Tissue modification device
USD610259S1 (en) 2008-10-23 2010-02-16 Vertos Medical, Inc. Tissue modification device
USD619252S1 (en) 2008-10-23 2010-07-06 Vertos Medical, Inc. Tissue modification device
USD676964S1 (en) 2008-10-23 2013-02-26 Vertos Medical, Inc. Tissue modification device
USD621939S1 (en) 2008-10-23 2010-08-17 Vertos Medical, Inc. Tissue modification device
US8308814B2 (en) * 2009-03-27 2012-11-13 Depuy Mitek, Inc. Methods and devices for preparing and implanting tissue scaffolds
US10449052B2 (en) 2009-03-27 2019-10-22 Depuy Synthes Products, Inc Methods and devices for preparing and implanting tissue scaffolds
US20100249801A1 (en) * 2009-03-27 2010-09-30 Depuy Mitek, Inc. Methods and devices for delivering and affixing tissue scaffolds
US9848999B2 (en) 2009-03-27 2017-12-26 Depuy Mitek, Llc Methods and devices for delivering and affixing tissue scaffolds
US8469980B2 (en) 2009-03-27 2013-06-25 Depuy Mitek, Llc Methods and devices for preparing and implanting tissue scaffolds
US10821005B2 (en) 2009-03-27 2020-11-03 DePuy Synthes Products, Inc. Methods and devices for delivering and affixing tissue scaffolds
US8241298B2 (en) 2009-03-27 2012-08-14 Depuy Mitek, Inc. Methods and devices for delivering and affixing tissue scaffolds
US9421082B2 (en) 2009-03-27 2016-08-23 Depuy Mitek, Llc Methods and devices for preparing and implanting tissue scaffolds
AU2018282379B2 (en) * 2009-03-27 2019-09-26 Depuy Mitek, Inc. Methods and devices for preparing and implanting tissue scaffolds
US11554028B2 (en) 2009-03-27 2023-01-17 DePuy Synthes Products, Inc. Methods and devices for delivering and affixing tissue scaffolds
US9149369B2 (en) 2009-03-27 2015-10-06 Depuy Mitek, Llc Methods and devices for delivering and affixing tissue scaffolds
CN101879080A (en) * 2009-03-27 2010-11-10 德普伊米特克公司 Be used to prepare method and apparatus with implanting tissue scaffolds
US11589995B2 (en) 2009-03-27 2023-02-28 DePuy Synthes Products, Inc. Methods and devices for preparing and implanting tissue scaffolds
US20100249758A1 (en) * 2009-03-27 2010-09-30 Depuy Mitek, Inc. Methods and devices for preparing and implanting tissue scaffolds
US8394102B2 (en) 2009-06-25 2013-03-12 Baxano, Inc. Surgical tools for treatment of spinal stenosis
US9687254B2 (en) 2010-10-22 2017-06-27 Medtronic Xomed, Inc. Method and apparatus for removing material from an intervertebral disc space and preparing end plates
US8414606B2 (en) 2010-10-22 2013-04-09 Medtronic Xomed, Inc. Method and apparatus for removing material from an intervertebral disc space and preparing end plates
US11471210B2 (en) 2011-12-30 2022-10-18 Relievant Medsystems, Inc. Methods of denervating vertebral body using external energy source
US10426501B2 (en) * 2012-01-13 2019-10-01 Crux Biomedical, Inc. Retrieval snare device and method
US20130184738A1 (en) * 2012-01-13 2013-07-18 Crux Biomedical, Inc. Retrieval snare device and method
US9538995B2 (en) * 2012-04-28 2017-01-10 Physcient, Inc. Methods and devices for soft tissue dissection
US9592069B2 (en) 2012-04-28 2017-03-14 Physcient, Inc. Methods and devices for soft tissue dissection
US10639056B2 (en) 2012-04-28 2020-05-05 Physcient, Inc. Methods and devices for soft tissue dissection
US20130310869A1 (en) * 2012-04-28 2013-11-21 Physcient, Inc. Methods and devices for soft tissue dissection
US11253283B2 (en) 2012-04-28 2022-02-22 Physcient, Inc. Methods and devices for soft tissue dissection
US9629646B2 (en) 2012-07-11 2017-04-25 Jens Kather Curved burr surgical instrument
US11737814B2 (en) 2012-09-12 2023-08-29 Relievant Medsystems, Inc. Cryotherapy treatment for back pain
US11701168B2 (en) 2012-09-12 2023-07-18 Relievant Medsystems, Inc. Radiofrequency ablation of tissue within a vertebral body
US11690667B2 (en) 2012-09-12 2023-07-04 Relievant Medsystems, Inc. Radiofrequency ablation of tissue within a vertebral body
US11234764B1 (en) 2012-11-05 2022-02-01 Relievant Medsystems, Inc. Systems for navigation and treatment within a vertebral body
US11291502B2 (en) 2012-11-05 2022-04-05 Relievant Medsystems, Inc. Methods of navigation and treatment within a vertebral body
US20140276832A1 (en) * 2013-03-14 2014-09-18 Nadi Salah Hibri Surgical Device
US9295479B2 (en) * 2013-03-14 2016-03-29 Spinal Stabilization Technologies, Llc Surgical device
CN105142547A (en) * 2013-03-15 2015-12-09 德普伊新特斯产品公司 Tools for tissue removal
US11534194B2 (en) 2013-03-15 2022-12-27 DePuy Synthes Products, Inc. Tools and methods for tissue removal
AU2014237740B2 (en) * 2013-03-15 2018-11-15 DePuy Synthes Products, Inc. Tools for tissue removal
US10582943B2 (en) 2013-03-15 2020-03-10 Depuy Synthes Products Llc Tools and methods for tissue removal
WO2014149863A1 (en) * 2013-03-15 2014-09-25 DePuy Synthes Products, LLC Tools for tissue removal
US10582942B2 (en) 2014-04-18 2020-03-10 Physcient, Inc. Methods and devices for soft tissue dissection
US10383651B2 (en) 2014-04-22 2019-08-20 Physcient, Inc. Instruments, devices, and related methods for soft tissue dissection
US11653934B2 (en) 2015-03-06 2023-05-23 Warsaw Orthopedic, Inc. Surgical instrument and method
US10080571B2 (en) 2015-03-06 2018-09-25 Warsaw Orthopedic, Inc. Surgical instrument and method
US10667827B2 (en) 2015-03-06 2020-06-02 Warsaw Orthopedic, Inc. Surgical instrument and method
US10653433B2 (en) * 2016-02-23 2020-05-19 Terumo Kabushiki Kaisha Medical device and method for treatment
US20170238948A1 (en) * 2016-02-23 2017-08-24 Terumo Kabushiki Kaisha Medical device and method for treatment
US10888350B2 (en) * 2017-05-31 2021-01-12 Terumo Kabushiki Kaisha Device handle for a medical device
US11389191B2 (en) 2017-05-31 2022-07-19 Terumo Kabushiki Kaisha Device handle for a medical device
US20180368880A1 (en) * 2017-05-31 2018-12-27 Terumo Kabushiki Kaisha Device handle for a medical device
WO2020089415A1 (en) * 2018-11-01 2020-05-07 Koninklijke Philips N.V. Atherectomy devices including pre-shaped and curved distal portions and methods
US11426199B2 (en) 2019-09-12 2022-08-30 Relievant Medsystems, Inc. Methods of treating a vertebral body

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