CA2343757A1 - Cryosurgical instrument - Google Patents
Cryosurgical instrument Download PDFInfo
- Publication number
- CA2343757A1 CA2343757A1 CA002343757A CA2343757A CA2343757A1 CA 2343757 A1 CA2343757 A1 CA 2343757A1 CA 002343757 A CA002343757 A CA 002343757A CA 2343757 A CA2343757 A CA 2343757A CA 2343757 A1 CA2343757 A1 CA 2343757A1
- Authority
- CA
- Canada
- Prior art keywords
- cooling
- instrument according
- unit
- freezing
- freezing unit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
Classifications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B18/00—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body
- A61B18/02—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by cooling, e.g. cryogenic techniques
Abstract
A cryosurgical instrument (1) including a long, resiliently flexible cable ( 2) terminating at a freezing unit (3) with a selectively operable thermoelectri c cooling device (13) for normally freezing a leading contact tip (6).
Description
CRYOSURGICAL INSTRUMENT
FIELD OF THE INVENTION
The invention relates to a cryosurgical instrument for cryosurgical -procedures in body lumens.
BACKGROUND OF THE INVENTION
The conventional surgical technique for removing a foreign object aspirated into a patient's lungs is by means of the introduction of a flexible bronchoscope with a conduit enabling the insertion of fine forceps for retrieval of the object. However, such a foreign object can be smooth or flat and therefore difficult to grip thereby precluding its removal by forceps and to necessitating a more invasive surgical technique.
SUMMARY OF THE INVENTION
In accordance with the present invention, there is provided a cryosurgical instrument comprising a long, resiliently flexible cable terminating at a freezing unit with a selectively operable thermoelectric is cooling device for normally freezing a leading contact tip.
By virtue of the design of the cryosurgical instrument of the present invention, cryosurgery is now facilitated in body lumens which hitherto have been inaccessible to conventional direct access cryosurgical instruments having rigid probes, for example, as illustrated and described in US Patent 20 3,942,519 to Shock. The cryosurgical instrument of the present invention affords a wide range of newly envisaged cryosurgical procedures in body lumens of both human and animal subjects accessible via either physiological openings or minimally invasive surgical openings. Such procedures include those hitherto performed by conventional surgical procedures, for example.
WO 00/15129 _ 2 _ PCT/IL99/00491 removing a foreign body from a patient's lung, and also inter alia cryoablation of tumors, removing naturally occurring stones such as gallbladder stones, kidney stones from the urinary tract, obstructing foreign bodies from the bowels, and the like.
BRIEF DESCRIPTION OF THE DRAWINGS
In order to understand the invention and to see how it may be carried out in practice, a preferred embodiment will now be described, by way of a non-limiting example only, with reference to the accompanying drawings, in which:
to Fig. 1 is a pictorial view of a cryogenic instrument of the present invention having a long, resiliently flexible cable terminating at a freezing unit with a leading contact tip;
Fig. 2 is a longitudinal cross sectional close-up view of the freezing unit along line II-II in Figure l;
is Fig. 3 is a longitudinal cross sectional view of the cable along line III-III in Figure 1;
Fig. 4 is a transverse cross sectional view of the cable along line IV-IV
in Figure 1;
Fig. 5 is a perspective view of a cooling unit for chilling an upstream 2o flow of cooling fluid; and Fig. 6 is a pictorial view showing the use of the cryogenic instrument of the present invention for removing a foreign object from a human subject's lung.
DETAILED DESCRIPTION OF THE DRAWINGS
?5 With reference now to Figures 1 to 5, a cryogenic instrument 1 includes a long, resiliently flexible cable 2 terminating at a freezing unit 3 with a trailing external casing surface 4 and a leading contact tip 6. The WO 00/15129 . 3 , PC1'/IL99/00491 contact tip 6 has a typical freezing temperature of between about -40°C
and about -70°C whilst the casing surface 4 has a preferred temperature of about 25°C. The cryosurgical instrument 1 includes a controller 7 connected to an electrical power supply 8 with positive and negative terminals 9 and 1 l, and a thermostatically controlled cooling system 12.
The freezing unit 3 has a thermoelectric cooling device (hereinafter TEC device) 13 with a distal surface 14 and a proximal surface 16. The distal surface 14 is covered by a polymeric or similar protective covering 15 acting as the leading contact tip 6, and thereby precluding direct contact with the 1 o TEC device 13. The distal and proximal surfaces 14 and 16 are selectively and reversibly connected to the power supply's terminals 9 and 11 by lengthwise extending electrical wires 17 and 18 whereby the cryogenic instrument 1 has three operative states: a stand-by inoperative state in which the TEC device 13 is disconnected from the power supply 8; a first operative state for normally freezing the contact tip 6 by connecting the TEC device's distal and proximal surfaces 14 and 16 to the power supply's positive and negative terminals 9 and 11, respectively; and a second operative state for occasionally heating the contact tip 6, for example, to release a frozen surgical tissue, if necessary, by connecting the TEC device's distal and proximal 2o surfaces 14 and 16 to the power supply's negative and positive terminals l I
and 9, respectively.
The cooling system 12 includes an inlet tube 19 centrally disposed in an outlet tube 21 for delivering an upstream flow of cooling fluid, for example, water via for cooling the freezing unit 3 and in particular the TEC
2s device's normally hot proximal surface 16. The inlet tube 19 includes cooling units 22 interdisposed between tube segments 23, each cooling unit 22 having a hollow housing 24 with an inlet port 26 and an outlet port 27. Each cooling unit 22 is integrally formed with four TEC devices 28 circumferentially disposed thereabout and connected to the power supply 8 by lengthwise WO 00/15129 . 4 _ PCT/IL99/00491 extending electrical wires 29 (schematically shown in Figure 3 as being exterior to the cable 2) for chilling the upstream flow of cooling fluid such that it arrives at the freezing unit 3 at near zero Celsius temperature, thereby minimizing the flow rate of cooling fluid required for cooling purposes. The s cooling units 22 are progressively smaller in size in an upstream direction and ' are designed for the step wise reduction of the cross sectional area of adjacent tube segments 23 in an upstream direction for lowering the required pressure differential along the inlet tube 19 whilst ensuring a su~cient flow of cooling fluid. The controller 7 receives temperature feedback for controlling the to cooling system 12 and TEC devices 28 from a temperature sensor 31 sensing the temperature of freezing unit's external casing surface 4 and a temperature sensor 32 disposed adjacent to the inlet tube's outlet port, the sensors 31 and 32 being connected to the controller 7 by lengthwise extending electrical wires 33 and 34, respectively (see Figure 2).
is The cryogenic instrument 1 is provided with a pair of diametrically opposite guide wires 36 and 37 extending in a downstream direction from the TEC device 13, passing through guide loops 38 provided on the cooling units 22 and terminating in handles 38 and 39, respectively, for manipulating the freezing unit 3 to a desired location in a body Iumen and/or cavity.
2o The freezing unit 2 is encircled by an inflatable sleeve 41 for selectively distending a narrow body lumen, the sleeve 41 being in flow communication with a pressure source, for example, a manually operated syringe 42, via a lengthwise extending tube 43.
The cryogenic instrument 1 is preferably employed with an imaging 2s system 44 connected to a lengthwise extending fiber optic 46 providing a forward looking field of view.
In Figure 6, a surgeon introduces the cryogenic instrument 1 into a patient's lung at a target site at which a foreign body has been identified.
The surgeon operates the cryogenic instrument 1 to freeze the contact tip 6 WO 00/15129 _ 5 . PCT/IL99/00491 whereupon its contact with the foreign body freeze grips the foreign body thereto enabling its removal from the patient's lung.
While the invention has been described with respect to a limited number of embodiments, it will be appreciated that many variations, modifications and other applications of the invention can be made by those ordinarily skilled in the art without departing from the scope of the claims appended hereto.
FIELD OF THE INVENTION
The invention relates to a cryosurgical instrument for cryosurgical -procedures in body lumens.
BACKGROUND OF THE INVENTION
The conventional surgical technique for removing a foreign object aspirated into a patient's lungs is by means of the introduction of a flexible bronchoscope with a conduit enabling the insertion of fine forceps for retrieval of the object. However, such a foreign object can be smooth or flat and therefore difficult to grip thereby precluding its removal by forceps and to necessitating a more invasive surgical technique.
SUMMARY OF THE INVENTION
In accordance with the present invention, there is provided a cryosurgical instrument comprising a long, resiliently flexible cable terminating at a freezing unit with a selectively operable thermoelectric is cooling device for normally freezing a leading contact tip.
By virtue of the design of the cryosurgical instrument of the present invention, cryosurgery is now facilitated in body lumens which hitherto have been inaccessible to conventional direct access cryosurgical instruments having rigid probes, for example, as illustrated and described in US Patent 20 3,942,519 to Shock. The cryosurgical instrument of the present invention affords a wide range of newly envisaged cryosurgical procedures in body lumens of both human and animal subjects accessible via either physiological openings or minimally invasive surgical openings. Such procedures include those hitherto performed by conventional surgical procedures, for example.
WO 00/15129 _ 2 _ PCT/IL99/00491 removing a foreign body from a patient's lung, and also inter alia cryoablation of tumors, removing naturally occurring stones such as gallbladder stones, kidney stones from the urinary tract, obstructing foreign bodies from the bowels, and the like.
BRIEF DESCRIPTION OF THE DRAWINGS
In order to understand the invention and to see how it may be carried out in practice, a preferred embodiment will now be described, by way of a non-limiting example only, with reference to the accompanying drawings, in which:
to Fig. 1 is a pictorial view of a cryogenic instrument of the present invention having a long, resiliently flexible cable terminating at a freezing unit with a leading contact tip;
Fig. 2 is a longitudinal cross sectional close-up view of the freezing unit along line II-II in Figure l;
is Fig. 3 is a longitudinal cross sectional view of the cable along line III-III in Figure 1;
Fig. 4 is a transverse cross sectional view of the cable along line IV-IV
in Figure 1;
Fig. 5 is a perspective view of a cooling unit for chilling an upstream 2o flow of cooling fluid; and Fig. 6 is a pictorial view showing the use of the cryogenic instrument of the present invention for removing a foreign object from a human subject's lung.
DETAILED DESCRIPTION OF THE DRAWINGS
?5 With reference now to Figures 1 to 5, a cryogenic instrument 1 includes a long, resiliently flexible cable 2 terminating at a freezing unit 3 with a trailing external casing surface 4 and a leading contact tip 6. The WO 00/15129 . 3 , PC1'/IL99/00491 contact tip 6 has a typical freezing temperature of between about -40°C
and about -70°C whilst the casing surface 4 has a preferred temperature of about 25°C. The cryosurgical instrument 1 includes a controller 7 connected to an electrical power supply 8 with positive and negative terminals 9 and 1 l, and a thermostatically controlled cooling system 12.
The freezing unit 3 has a thermoelectric cooling device (hereinafter TEC device) 13 with a distal surface 14 and a proximal surface 16. The distal surface 14 is covered by a polymeric or similar protective covering 15 acting as the leading contact tip 6, and thereby precluding direct contact with the 1 o TEC device 13. The distal and proximal surfaces 14 and 16 are selectively and reversibly connected to the power supply's terminals 9 and 11 by lengthwise extending electrical wires 17 and 18 whereby the cryogenic instrument 1 has three operative states: a stand-by inoperative state in which the TEC device 13 is disconnected from the power supply 8; a first operative state for normally freezing the contact tip 6 by connecting the TEC device's distal and proximal surfaces 14 and 16 to the power supply's positive and negative terminals 9 and 11, respectively; and a second operative state for occasionally heating the contact tip 6, for example, to release a frozen surgical tissue, if necessary, by connecting the TEC device's distal and proximal 2o surfaces 14 and 16 to the power supply's negative and positive terminals l I
and 9, respectively.
The cooling system 12 includes an inlet tube 19 centrally disposed in an outlet tube 21 for delivering an upstream flow of cooling fluid, for example, water via for cooling the freezing unit 3 and in particular the TEC
2s device's normally hot proximal surface 16. The inlet tube 19 includes cooling units 22 interdisposed between tube segments 23, each cooling unit 22 having a hollow housing 24 with an inlet port 26 and an outlet port 27. Each cooling unit 22 is integrally formed with four TEC devices 28 circumferentially disposed thereabout and connected to the power supply 8 by lengthwise WO 00/15129 . 4 _ PCT/IL99/00491 extending electrical wires 29 (schematically shown in Figure 3 as being exterior to the cable 2) for chilling the upstream flow of cooling fluid such that it arrives at the freezing unit 3 at near zero Celsius temperature, thereby minimizing the flow rate of cooling fluid required for cooling purposes. The s cooling units 22 are progressively smaller in size in an upstream direction and ' are designed for the step wise reduction of the cross sectional area of adjacent tube segments 23 in an upstream direction for lowering the required pressure differential along the inlet tube 19 whilst ensuring a su~cient flow of cooling fluid. The controller 7 receives temperature feedback for controlling the to cooling system 12 and TEC devices 28 from a temperature sensor 31 sensing the temperature of freezing unit's external casing surface 4 and a temperature sensor 32 disposed adjacent to the inlet tube's outlet port, the sensors 31 and 32 being connected to the controller 7 by lengthwise extending electrical wires 33 and 34, respectively (see Figure 2).
is The cryogenic instrument 1 is provided with a pair of diametrically opposite guide wires 36 and 37 extending in a downstream direction from the TEC device 13, passing through guide loops 38 provided on the cooling units 22 and terminating in handles 38 and 39, respectively, for manipulating the freezing unit 3 to a desired location in a body Iumen and/or cavity.
2o The freezing unit 2 is encircled by an inflatable sleeve 41 for selectively distending a narrow body lumen, the sleeve 41 being in flow communication with a pressure source, for example, a manually operated syringe 42, via a lengthwise extending tube 43.
The cryogenic instrument 1 is preferably employed with an imaging 2s system 44 connected to a lengthwise extending fiber optic 46 providing a forward looking field of view.
In Figure 6, a surgeon introduces the cryogenic instrument 1 into a patient's lung at a target site at which a foreign body has been identified.
The surgeon operates the cryogenic instrument 1 to freeze the contact tip 6 WO 00/15129 _ 5 . PCT/IL99/00491 whereupon its contact with the foreign body freeze grips the foreign body thereto enabling its removal from the patient's lung.
While the invention has been described with respect to a limited number of embodiments, it will be appreciated that many variations, modifications and other applications of the invention can be made by those ordinarily skilled in the art without departing from the scope of the claims appended hereto.
Claims (10)
1. A. cryosurgical instrument comprising a long, resiliently flexible cable terminating at a freezing unit associated with a leading contact tip, said freezing unit incorporating a selectively operable thermoelectric cooling device for normally freezing said leading contact tip, said cooling device having a distal surface acting as said leading contact tip of the freezing unit, and a proximal surface at which the cooling device terminates, the instrument further comprising an inlet tube extending along said resiliently flexible cable and terminating adjacent said proximal surface of the cooling device, for delivering an upstream flow of cooling fluid from an external cooling system to said proximal surface, said inlet tube being provided with at least one cooling unit extending along a portion of the inlet tube's length and spaced from said proximal surface of the cooling device or chilling said upstream flow of cooling fluid before it arrives to said proximal surface.
2. A cryosurgical instrument according to claim 1, wherein the thermoelectric cooling device of said freezing unit is capable of keeping said contact tip at a freezing temperature of between about -40° C and about -70° C, whilst said at least one cooling unit is adapted for chilling the upstream flow of cooling fluid such that it arrives at the freezing unit at near 0° C
temperature.
temperature.
3. A cryosurgical instrument according to claim 1, comprising a plurality of the cooling units inter-disposed between segments of said inlet tube.
4. A cryosurgical instrument according to claim 3, wherein each cooling unit includes at least one thermoelectric cooling device.
5. A cryosurgical instrument according to claim 1, wherein said inlet tube tapers towards said freezing unit.
6. A cryosurgical instrument according to claim 1, wherein said cooling device is capable of selectively heating said contact tip.
7. A cryosurgical instrument according to claim 1, further comprising an inflatable sleeve adjacent said freezing unit for selectively distending a narrow body lumen.
8. A cryosurgical instrument according to claim 1, wherein said inlet tube together with at least said one cooling unit is disposed within an outlet tube for delivering said cooling fluid away from said freezing unit towards said external cooling system.
9. A cryosurgical instrument according to claim 1, wherein each cooling unit comprises a hollow housing for the passage of cooling fluid therethrough and a plurality of thermoelectric cooling devices circumferentially disposed thereabout.
10. A cryosurgical. instrument according to claim 9, further comprising a pair of diametrically opposite guiding means extending in a downstream direction from said freezing unit and passing through said plurality of cooling units far manipulating the freezing unit.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| IL12618298A IL126182A0 (en) | 1998-09-11 | 1998-09-11 | Cryosurgical instrument |
| IL126182 | 1998-09-11 | ||
| PCT/IL1999/000491 WO2000015129A1 (en) | 1998-09-11 | 1999-09-09 | Cryosurgical instrument |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2343757A1 true CA2343757A1 (en) | 2000-03-23 |
Family
ID=11071958
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002343757A Abandoned CA2343757A1 (en) | 1998-09-11 | 1999-09-09 | Cryosurgical instrument |
Country Status (9)
| Country | Link |
|---|---|
| US (1) | US6623479B1 (en) |
| EP (1) | EP1112032B1 (en) |
| AT (1) | ATE235192T1 (en) |
| AU (1) | AU750169B2 (en) |
| CA (1) | CA2343757A1 (en) |
| DE (1) | DE69906320T2 (en) |
| ES (1) | ES2195605T3 (en) |
| IL (1) | IL126182A0 (en) |
| WO (1) | WO2000015129A1 (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6789545B2 (en) * | 2002-10-04 | 2004-09-14 | Sanarus Medical, Inc. | Method and system for cryoablating fibroadenomas |
| US8137677B2 (en) | 2005-10-06 | 2012-03-20 | Allergan, Inc. | Non-protein stabilized clostridial toxin pharmaceutical compositions |
| US20080161890A1 (en) * | 2007-01-03 | 2008-07-03 | Boston Scientific Scimed, Inc. | Methods, systems, and apparatuses for protecting esophageal tissue during ablation |
| US8915908B2 (en) | 2009-03-20 | 2014-12-23 | Atricure, Inc. | Cryogenic probe |
| EP3437579B1 (en) * | 2017-08-04 | 2023-07-12 | Erbe Elektromedizin GmbH | Cryosurgical instrument |
Family Cites Families (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3536075A (en) | 1967-08-01 | 1970-10-27 | Univ Northwestern | Cryosurgical instrument |
| US3942519A (en) | 1972-12-26 | 1976-03-09 | Ultrasonic Systems, Inc. | Method of ultrasonic cryogenic cataract removal |
| US3976077A (en) | 1975-02-03 | 1976-08-24 | Kerfoot Jr Franklin W | Eye surgery device |
| US5108390A (en) | 1988-11-14 | 1992-04-28 | Frigitronics, Inc. | Flexible cryoprobe |
| GB2226497B (en) | 1988-12-01 | 1992-07-01 | Spembly Medical Ltd | Cryosurgical probe |
| ZA917281B (en) | 1990-09-26 | 1992-08-26 | Cryomedical Sciences Inc | Cryosurgical instrument and system and method of cryosurgery |
| US5139496A (en) | 1990-12-20 | 1992-08-18 | Hed Aharon Z | Ultrasonic freeze ablation catheters and probes |
| US5207674A (en) | 1991-05-13 | 1993-05-04 | Hamilton Archie C | Electronic cryogenic surgical probe apparatus and method |
| US6110168A (en) * | 1993-02-10 | 2000-08-29 | Radiant Medical, Inc. | Method and apparatus for controlling a patient's body temperature by in situ blood temperature modifications |
| US5967976A (en) * | 1994-08-19 | 1999-10-19 | Novoste Corporation | Apparatus and methods for procedures related to the electrophysiology of the heart |
| US5654546A (en) | 1995-11-07 | 1997-08-05 | Molecular Imaging Corporation | Variable temperature scanning probe microscope based on a peltier device |
| US5733280A (en) | 1995-11-15 | 1998-03-31 | Avitall; Boaz | Cryogenic epicardial mapping and ablation |
-
1998
- 1998-09-11 IL IL12618298A patent/IL126182A0/en unknown
-
1999
- 1999-09-09 CA CA002343757A patent/CA2343757A1/en not_active Abandoned
- 1999-09-09 EP EP99943194A patent/EP1112032B1/en not_active Expired - Lifetime
- 1999-09-09 ES ES99943194T patent/ES2195605T3/en not_active Expired - Lifetime
- 1999-09-09 WO PCT/IL1999/000491 patent/WO2000015129A1/en active IP Right Grant
- 1999-09-09 AU AU56463/99A patent/AU750169B2/en not_active Ceased
- 1999-09-09 AT AT99943194T patent/ATE235192T1/en not_active IP Right Cessation
- 1999-09-09 DE DE69906320T patent/DE69906320T2/en not_active Expired - Fee Related
- 1999-09-09 US US09/786,858 patent/US6623479B1/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| US6623479B1 (en) | 2003-09-23 |
| EP1112032B1 (en) | 2003-03-26 |
| DE69906320T2 (en) | 2003-08-28 |
| AU750169B2 (en) | 2002-07-11 |
| AU5646399A (en) | 2000-04-03 |
| IL126182A0 (en) | 1999-05-09 |
| DE69906320D1 (en) | 2003-04-30 |
| ES2195605T3 (en) | 2003-12-01 |
| EP1112032A1 (en) | 2001-07-04 |
| WO2000015129A1 (en) | 2000-03-23 |
| ATE235192T1 (en) | 2003-04-15 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| FZDE | Discontinued |