US3762416A - Artery entry tool - Google Patents

Artery entry tool Download PDF

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Publication number
US3762416A
US3762416A US00147078A US3762416DA US3762416A US 3762416 A US3762416 A US 3762416A US 00147078 A US00147078 A US 00147078A US 3762416D A US3762416D A US 3762416DA US 3762416 A US3762416 A US 3762416A
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United States
Prior art keywords
blade
sleeve
tapered
shoulder
incision
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Expired - Lifetime
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US00147078A
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E Moss
W Forbes
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National Research Development Corp UK
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National Research Development Corp UK
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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/34—Trocars; Puncturing needles
    • A61B17/3498—Valves therefor, e.g. flapper valves, slide valves
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/34—Trocars; Puncturing needles
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/34—Trocars; Puncturing needles
    • A61B17/3415—Trocars; Puncturing needles for introducing tubes or catheters, e.g. gastrostomy tubes, drain catheters
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/34—Trocars; Puncturing needles
    • A61B2017/347—Locking means, e.g. for locking instrument in cannula

Definitions

  • a tool for providing an entry through a tissue wall, such as an artery comprises an elongated member having a [30] Foreign Application Priority Data tapered end at which is provided a sharp edge for mak- June 3 1970 Great Britain .1 26 893/70 incision in the this member being removably axially located in a tube with the tapered end pro- 52 us. (:1. 128/305, 128/347 J'eehhg from ehe end efthe tube, and the tube one end 51 1m. (:1.
  • the clamping action is preferably effected by urging a sleeve, located [56] References Cited around the tube, against a re-entrant shoulder at the ta- UNITED STATES PATENTS pered end of the tube.
  • the member is itself tubular with a rod axially movable therein to proj- 918,437 4/1909 Genung 128/347 UX ect at the relevant rod d a blade Carried by the 1,213,001 1/1917 Phllips 128/347 3,313,299 4/1967 Spademen 128/347 X 4 Claims, 3 Drawing Figures ARTERY ENTRY TOOL
  • This invention relates to a tool for providing an entry through a tissue wall, for example into an artery. It has one application in providing an entry into an artery for the clearance drill of British Patent Specification No. 1,235,321.
  • a tool for providing an entry through a tissue wall comprises an elongated member having a tapered end at which is provided a sharp edge for making an incision in the tissue wall, a tubular member within which said elongated member is removably located with its tapered end projecting from an end thereof, said tubular member having said end tapered to meet the taper of said elongated member and being provided with means for clamping the edge of said incision to the outer surface of the tubular member.
  • the clamping means may comprise a re-entrant shoulder on the tapered end of the tubular member, and a sleeve axially movable on the tubular member for clamping the edge of the incision against the shoulder.
  • the radial surface of the shoulder may include a circumferential depression aligned with the edge of the sleeve to aid the clamping action.
  • the sharp edge may be located at the end of a rod which is axially movable within the elongated member, said elongated member also being tubular for this purpose and having an aperture, which may be slit-like, at its tapered end through which the sharp edge can be projected and withdrawn by said axial movement. Said movement may be effected by a springJoaded plunger located at the other end of the rod.
  • the sleeve may be spring-loaded against the shoulder, and a catch may be provided to hold the sleeve away from the shoulder when desired.
  • the elongated member may be provided with an external threaded portion which removably engages a corresponding internal portion on the tubularmember.
  • a valve may be provided for closing the bore of said tubular member when the elongated member is removed therefrom.
  • the valve may be spring-loaded to effect such closure automatically.
  • FIG. 1 is a sectional elevation of an embodiment of the invention.
  • FIG. 2 is a view in the direction 11-" of FIG. 1 on an enlarged scale.
  • FIG. 3 is a view in the direction III-Ill of FIG. 1 on an enlarged scale.
  • an elongated tubular member 1 has a tapered end 2.
  • the taper is generally circular in cross-section but includes two flats 3 which terminate in a slit-like aperture 4, extending within the tapered end to communicate with the bore of member l.
  • Member 1 is located within a further tubular member 5 by means of screw-threaded portions 6. When so located, the tapered end 2 of member 1 projects beyond the end of member 5, the latter being tapered as shown at 7 to continue the taper of end 2.
  • Tapered portion 7 terminates in a re-entrant shoulder 8 of which the radial surface preferably includes a circumferential depression as shown.
  • Axially slidable on member 5 is a sleeve 9.
  • the sleeve is spring-loaded against shoulder 8 by a spring 10, but
  • a catch comprising a right-angled slot 11 in which runs a pin 12 extending from member 5.
  • the sleeve is provided with a circumferential stop 20 adjacent the sleeve end loaded against the shoulder 8.
  • a rod 13 is axially movable within member 1 and terminates in a blade 14 which can be projected through, or withdrawn into, aperture 4 by the axial movement.
  • FIG. 1 shows blade 14 withdrawn, and FIG. 3 the blade projected.
  • the other end of rod 13 terminates in a plunger 15 which is spring-loaded by a spring 16 in a sense to cause the blade 14 to be withdrawn.
  • the blade 14 is aligned in slit 4 by means of a screw 21 extending from the member 1 to run in a groove 22 in the plunger 15.
  • Tubular member 5 is provided with a valve comprising a transversely slidable plate 17 having a hole 18 therein, and spring-loaded by a spring 19 in a sense to cause the plate to seal the bore of the member 5.
  • spring 19 can be compressed to allow member 1 to pass through hole 18.
  • sleeve 9 is first held back from shoulder 8 by its catch, and the aperture 4 held against the artery with blade 14 withdrawn. An incision is then made by depressing plunger 15, and the tapered ends 2 and 7 passed into the incision until the edges of the latter curve over shoulder 8. Sleeve 9 is then released so that the edges of the incision are clamped between the sleeve and the shoulder. The circumferential depression in the latter is aligned with the edge of the sleeve and so improves the clamping. Thereafter member 1, together with rod 13, is unscrewed from tubular member 5, the valve closing automatically as it is withdrawn to reduce loss of blood.
  • Apparatus which it is desired to introduce into the artery e.g., the bit of the afore-mentioned drill, or probes or catheters, can then be passed down the bore of tubular member 5, the valve being opened manually to allow such passage.
  • the stop 20 prevents the assembly being pushed too far into the incision.
  • spring 10 and the associated catch slot 11 and pin 12, plunger 15 and spring 16 together with associated screw 21 and slot 22, and valve plate 17 and associated spring 19, are located remotely from the tapered end of the illustrated tool. This facilitates manufacture of the tapered end portion of the tool, which is the proximal end relative to an associated entry site, to suitably small dimensions, while associated operations by a surgeon or other personnel are effected at the distal end of the tool.
  • FIG. 1 is approximately to scale and the bore of tubular member 5 is about three-sixteenths inch in the relevant tool embodiment.
  • the illustrated tool embodiment is made of stainless steel with the tapered surfaces 2 and 7, including the flats 3, being of highly polished finish.
  • rod 13 and aperture 4 are dispensed with, and a blade or spear-edge provided at tip of tapered end which, in use, is pushed through the artery wall.
  • valve shown in FIG. 1 may be replaced by, for example, a spring-loaded ball valve of known form.
  • a surgical tool for providing an entry through a tissue wall comprising:
  • a first elongate tubular member having one end portion of greater radial dimensions than the remainder thereof, which end portion is convergently tapercd towards its adjacent free end and defines, rcmotely from said free end, a re-entrant shoulder;
  • a second elongate tubular member having one end portion thereof tapered towards its adjacent free end, extending longitudinally within said first member with their respective tapered end portions similarly directed, and demountably connected with said first member to locate said tapered end portions in a contiguous successively tapering relationship;
  • an elongate cutting member formed with a blade at one end thereof, and coupled with and longitudinally slidably located in said second member with said blade nearer to said tapered end portions;
  • first spring means acting between said second member and said cutting member to withdraw said blade within said second member
  • a plunger connected with said cutting member remotely from said blade and operable, against the action of said first spring means, to project said blade from said second member to form an incision in a tissue wall and afford entry for said tapered end portions thcrethrough;
  • a tool according to claim 1 wherein said shoulder is formed with a circumferential depression therearound aligned with the adjacent end of said sleeve.
  • a tool according to claim 1 comprising a springloaded valve connected with said first member to close the bore thereof automatically upon demounting of said second member and said cutting member therefrom.

Abstract

A tool for providing an entry through a tissue wall, such as an artery, comprises an elongated member having a tapered end at which is provided a sharp edge for making an incision in the wall, this member being removably axially located in a tube with the tapered end projecting from one end of the tube, and the tube one end being tapered to meet the taper of the member and being provided with means for clamping the edge of the incision to the outside of the tube. The clamping action is preferably effected by urging a sleeve, located around the tube, against a re-entrant shoulder at the tapered end of the tube. Conveniently, the member is itself tubular with a rod axially movable therein to project at the relevant rod end a blade carried by the rod.

Description

United States Patent Moss et al. 1 Oct. 2, 1973 [54] ARTERY ENTRY TOOL 3,528,425 9/1970 Banko 128/305 [75] Inventors: Edward Moss, Woodley; Walter FOREIGN PATENTS OR APPLICATIONS warrick Wright Forbes, 996,531 8/l95l France 128/347 Readmg, both of England [73] Assignee: National Research Development Primary Examinerchanning Pace C ti L d E l d Att0rneyCushman, Darby & Cushman 2 F'] 26 1 7] [2 1 May 9 57 ABSTRACT [211 App! l47078 A tool for providing an entry through a tissue wall, such as an artery, comprises an elongated member having a [30] Foreign Application Priority Data tapered end at which is provided a sharp edge for mak- June 3 1970 Great Britain .1 26 893/70 incision in the this member being removably axially located in a tube with the tapered end pro- 52 us. (:1. 128/305, 128/347 J'eehhg from ehe end efthe tube, and the tube one end 51 1m. (:1. A6lb 17/32, A6lb 17/34 being tapered meet the tape of the member and 58 Field of Search 128/305, 347 350 R- being Previded with means fer clamping the edge efthe 27/24 incision to the outside of the tube. The clamping action is preferably effected by urging a sleeve, located [56] References Cited around the tube, against a re-entrant shoulder at the ta- UNITED STATES PATENTS pered end of the tube. Conveniently, the member is itself tubular with a rod axially movable therein to proj- 918,437 4/1909 Genung 128/347 UX ect at the relevant rod d a blade Carried by the 1,213,001 1/1917 Phllips 128/347 3,313,299 4/1967 Spademen 128/347 X 4 Claims, 3 Drawing Figures ARTERY ENTRY TOOL This invention relates to a tool for providing an entry through a tissue wall, for example into an artery. It has one application in providing an entry into an artery for the clearance drill of British Patent Specification No. 1,235,321.
According to the present invention a tool for providing an entry through a tissue wall comprises an elongated member having a tapered end at which is provided a sharp edge for making an incision in the tissue wall, a tubular member within which said elongated member is removably located with its tapered end projecting from an end thereof, said tubular member having said end tapered to meet the taper of said elongated member and being provided with means for clamping the edge of said incision to the outer surface of the tubular member.
The clamping means may comprise a re-entrant shoulder on the tapered end of the tubular member, and a sleeve axially movable on the tubular member for clamping the edge of the incision against the shoulder. The radial surface of the shoulder may include a circumferential depression aligned with the edge of the sleeve to aid the clamping action.
The sharp edge may be located at the end of a rod which is axially movable within the elongated member, said elongated member also being tubular for this purpose and having an aperture, which may be slit-like, at its tapered end through which the sharp edge can be projected and withdrawn by said axial movement. Said movement may be effected by a springJoaded plunger located at the other end of the rod.
The sleeve may be spring-loaded against the shoulder, and a catch may be provided to hold the sleeve away from the shoulder when desired.
The elongated member may be provided with an external threaded portion which removably engages a corresponding internal portion on the tubularmember.
A valve may be provided for closing the bore of said tubular member when the elongated member is removed therefrom. The valve may be spring-loaded to effect such closure automatically.
To enable the nature of the present invention to be more readily understood, attention is directed by way of example to the accompanying drawings wherein:
FIG. 1 is a sectional elevation of an embodiment of the invention.
FIG. 2 is a view in the direction 11-" of FIG. 1 on an enlarged scale.
FIG. 3 is a view in the direction III-Ill of FIG. 1 on an enlarged scale.
In FIG. 1 an elongated tubular member 1 has a tapered end 2. As will be seen in FIGS. 2 and 3 the taper is generally circular in cross-section but includes two flats 3 which terminate in a slit-like aperture 4, extending within the tapered end to communicate with the bore of member l. Member 1 is located within a further tubular member 5 by means of screw-threaded portions 6. When so located, the tapered end 2 of member 1 projects beyond the end of member 5, the latter being tapered as shown at 7 to continue the taper of end 2. Tapered portion 7 terminates in a re-entrant shoulder 8 of which the radial surface preferably includes a circumferential depression as shown.
Axially slidable on member 5 is a sleeve 9. The sleeve is spring-loaded against shoulder 8 by a spring 10, but
can be held away therefrom by a catch comprising a right-angled slot 11 in which runs a pin 12 extending from member 5. The sleeve is provided with a circumferential stop 20 adjacent the sleeve end loaded against the shoulder 8.
A rod 13 is axially movable within member 1 and terminates in a blade 14 which can be projected through, or withdrawn into, aperture 4 by the axial movement. FIG. 1 shows blade 14 withdrawn, and FIG. 3 the blade projected. The other end of rod 13 terminates in a plunger 15 which is spring-loaded by a spring 16 in a sense to cause the blade 14 to be withdrawn. The blade 14 is aligned in slit 4 by means of a screw 21 extending from the member 1 to run in a groove 22 in the plunger 15.
Tubular member 5 is provided with a valve comprising a transversely slidable plate 17 having a hole 18 therein, and spring-loaded by a spring 19 in a sense to cause the plate to seal the bore of the member 5. When member 1 is inserted into member 5, spring 19 can be compressed to allow member 1 to pass through hole 18.
In use of the illustrated tool embodiment, sleeve 9 is first held back from shoulder 8 by its catch, and the aperture 4 held against the artery with blade 14 withdrawn. An incision is then made by depressing plunger 15, and the tapered ends 2 and 7 passed into the incision until the edges of the latter curve over shoulder 8. Sleeve 9 is then released so that the edges of the incision are clamped between the sleeve and the shoulder. The circumferential depression in the latter is aligned with the edge of the sleeve and so improves the clamping. Thereafter member 1, together with rod 13, is unscrewed from tubular member 5, the valve closing automatically as it is withdrawn to reduce loss of blood. Apparatus which it is desired to introduce into the artery, e.g., the bit of the afore-mentioned drill, or probes or catheters, can then be passed down the bore of tubular member 5, the valve being opened manually to allow such passage.
The stop 20 prevents the assembly being pushed too far into the incision.
It will be noted that spring 10 and the associated catch slot 11 and pin 12, plunger 15 and spring 16 together with associated screw 21 and slot 22, and valve plate 17 and associated spring 19, are located remotely from the tapered end of the illustrated tool. This facilitates manufacture of the tapered end portion of the tool, which is the proximal end relative to an associated entry site, to suitably small dimensions, while associated operations by a surgeon or other personnel are effected at the distal end of the tool. In this connection, it is noted that FIG. 1 is approximately to scale and the bore of tubular member 5 is about three-sixteenths inch in the relevant tool embodiment.
Also, it is noted that the illustrated tool embodiment is made of stainless steel with the tapered surfaces 2 and 7, including the flats 3, being of highly polished finish.
Various modifications of the above-described tool are possible. For example in a simplified version rod 13 and aperture 4 are dispensed with, and a blade or spear-edge provided at tip of tapered end which, in use, is pushed through the artery wall.
The form of valve shown in FIG. 1 may be replaced by, for example, a spring-loaded ball valve of known form.
We claim:
l. A surgical tool for providing an entry through a tissue wall, comprising:
a first elongate tubular member having one end portion of greater radial dimensions than the remainder thereof, which end portion is convergently tapercd towards its adjacent free end and defines, rcmotely from said free end, a re-entrant shoulder;
a second elongate tubular member having one end portion thereof tapered towards its adjacent free end, extending longitudinally within said first member with their respective tapered end portions similarly directed, and demountably connected with said first member to locate said tapered end portions in a contiguous successively tapering relationship;
an elongate cutting member formed with a blade at one end thereof, and coupled with and longitudinally slidably located in said second member with said blade nearer to said tapered end portions;
first spring means acting between said second member and said cutting member to withdraw said blade within said second member;
a plunger connected with said cutting member remotely from said blade and operable, against the action of said first spring means, to project said blade from said second member to form an incision in a tissue wall and afford entry for said tapered end portions thcrethrough;
a sleeve longitudinally slidably mounted around said first member;
second spring means acting between said first member and said sleeve, and urging said sleeve towards engagement at one end thereof with said shoulder to clamp therebetween the circumferential tissue defining said incision;
and a catch to hold said sleeve, against the action of said second spring means, removed from said shoulder when making said incision.
2. A tool according to claim 1 wherein said shoulder is formed with a circumferential depression therearound aligned with the adjacent end of said sleeve.
3. A tool according to claim 1 wherein said second member is formed with a slit aperture in its tapered end for passage of said blade therethrough, and said cutting member is coupled with said second member to key the same to align said blade with said slit aperture 4. A tool according to claim 1 comprising a springloaded valve connected with said first member to close the bore thereof automatically upon demounting of said second member and said cutting member therefrom.

Claims (4)

1. A surgical tool for providing an enTry through a tissue wall, comprising: a first elongate tubular member having one end portion of greater radial dimensions than the remainder thereof, which end portion is convergently tapered towards its adjacent free end and defines, remotely from said free end, a re-entrant shoulder; a second elongate tubular member having one end portion thereof tapered towards its adjacent free end, extending longitudinally within said first member with their respective tapered end portions similarly directed, and demountably connected with said first member to locate said tapered end portions in a contiguous successively tapering relationship; an elongate cutting member formed with a blade at one end thereof, and coupled with and longitudinally slidably located in said second member with said blade nearer to said tapered end portions; first spring means acting between said second member and said cutting member to withdraw said blade within said second member; a plunger connected with said cutting member remotely from said blade and operable, against the action of said first spring means, to project said blade from said second member to form an incision in a tissue wall and afford entry for said tapered end portions therethrough; a sleeve longitudinally slidably mounted around said first member; second spring means acting between said first member and said sleeve, and urging said sleeve towards engagement at one end thereof with said shoulder to clamp therebetween the circumferential tissue defining said incision; and a catch to hold said sleeve, against the action of said second spring means, removed from said shoulder when making said incision.
2. A tool according to claim 1 wherein said shoulder is formed with a circumferential depression therearound aligned with the adjacent end of said sleeve.
3. A tool according to claim 1 wherein said second member is formed with a slit aperture in its tapered end for passage of said blade therethrough, and said cutting member is coupled with said second member to key the same to align said blade with said slit aperture.
4. A tool according to claim 1 comprising a spring-loaded valve connected with said first member to close the bore thereof automatically upon demounting of said second member and said cutting member therefrom.
US00147078A 1970-06-03 1971-05-26 Artery entry tool Expired - Lifetime US3762416A (en)

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GB2689370A GB1356386A (en) 1970-06-03 1970-06-03 Artery entry tool

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DE (1) DE2126705A1 (en)
GB (1) GB1356386A (en)
SE (1) SE367541B (en)

Cited By (23)

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US4078552A (en) * 1975-06-23 1978-03-14 Warner-Lambert Company Device for and method of making standard and reproducible skin punctures
US4220155A (en) * 1978-05-11 1980-09-02 Colorado State University Research Foundation Apparatus for spaying large animals
US4411653A (en) * 1982-01-28 1983-10-25 Razi M Dean Cannula introducer
WO1983004174A1 (en) * 1982-05-25 1983-12-08 Robert Paul Leather A venous valve cutter for the incision of valve leaflets in situ
US4444184A (en) * 1977-11-29 1984-04-24 Aktiebolaget Stille-Werner Surgical instrument for operating on joints
US4491132A (en) * 1982-08-06 1985-01-01 Zimmer, Inc. Sheath and retractable surgical tool combination
US4559041A (en) * 1984-06-25 1985-12-17 Razi M Dean Cannula introducers
US4628929A (en) * 1985-08-16 1986-12-16 American Hospital Supply Corporation Retractable blade bleeding time device
US4790312A (en) * 1987-01-20 1988-12-13 Becton Dickinson Acutecare, Inc. Surgical knife
US5368035A (en) * 1988-03-21 1994-11-29 Boston Scientific Corporation Ultrasound imaging guidewire
US5372138A (en) * 1988-03-21 1994-12-13 Boston Scientific Corporation Acousting imaging catheters and the like
US5441041A (en) * 1993-09-13 1995-08-15 United States Surgical Corporation Optical trocar
US5467762A (en) * 1993-09-13 1995-11-21 United States Surgical Corporation Optical trocar
US5546948A (en) * 1990-08-21 1996-08-20 Boston Scientific Corporation Ultrasound imaging guidewire
US5690662A (en) * 1995-10-12 1997-11-25 The Trustees Of Columbia University In The City Of New York Device and method to create a smooth opening on a tubular structure such as an artery or a vein
US5690664A (en) * 1993-09-13 1997-11-25 United States Surgical Corporation Trocar having movable blade
US5779647A (en) * 1995-06-07 1998-07-14 Chau; Sonny Automated biopsy instruments
US5860996A (en) * 1994-05-26 1999-01-19 United States Surgical Corporation Optical trocar
US6197041B1 (en) 1991-06-26 2001-03-06 United States Surgical Corporation Trocar
US6488693B2 (en) * 2000-01-26 2002-12-03 Hearport, Inc. Vascular incisor and method
US20030136097A1 (en) * 2002-01-22 2003-07-24 Schoenherr Terrance L. Inverter shield for a windrow merger
US20100048994A1 (en) * 2007-04-11 2010-02-25 Okoniewski Gregory G Visualized entry trocar with moving blade
US20170143353A1 (en) * 2009-05-15 2017-05-25 Globus Medical, Inc. Screw guide and tissue retractor instrument

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US4902280A (en) * 1986-10-17 1990-02-20 United States Surgical Corporation Trocar
JPH0755222B2 (en) * 1986-12-12 1995-06-14 オリンパス光学工業株式会社 Treatment tool
DE4018588A1 (en) * 1990-06-11 1991-12-19 Wolf Gmbh Richard TROCAR SLEEVE
US5112321A (en) * 1991-06-07 1992-05-12 Richard Wolf Gmbh Trocar sleeve having manual closure
US5256147A (en) * 1992-06-17 1993-10-26 Minnesota Mining And Manufacturing Company Reusable trocar with easily replaceable obturator
US5554167A (en) * 1993-10-08 1996-09-10 United States Surgical Corporation Tissue piercing members
US5554137A (en) * 1993-10-08 1996-09-10 United States Surgical Corporation Tissue piercing members
FR2799635A1 (en) * 1999-10-18 2001-04-20 Patrick Eude Guiding device for pin used in bone surgery comprises a rigid body with a special end, a first drill with smooth end and a second drill with sharp end
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FR996531A (en) * 1949-10-04 1951-12-20 Aseptic bowel movement trocar
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Cited By (44)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4078552A (en) * 1975-06-23 1978-03-14 Warner-Lambert Company Device for and method of making standard and reproducible skin punctures
US4444184A (en) * 1977-11-29 1984-04-24 Aktiebolaget Stille-Werner Surgical instrument for operating on joints
US4220155A (en) * 1978-05-11 1980-09-02 Colorado State University Research Foundation Apparatus for spaying large animals
US4411653A (en) * 1982-01-28 1983-10-25 Razi M Dean Cannula introducer
WO1983004174A1 (en) * 1982-05-25 1983-12-08 Robert Paul Leather A venous valve cutter for the incision of valve leaflets in situ
US4493321A (en) * 1982-05-25 1985-01-15 Leather Robert P Venous valve cutter for the incision of valve leaflets in situ
US4491132A (en) * 1982-08-06 1985-01-01 Zimmer, Inc. Sheath and retractable surgical tool combination
US4559041A (en) * 1984-06-25 1985-12-17 Razi M Dean Cannula introducers
US4628929A (en) * 1985-08-16 1986-12-16 American Hospital Supply Corporation Retractable blade bleeding time device
US4790312A (en) * 1987-01-20 1988-12-13 Becton Dickinson Acutecare, Inc. Surgical knife
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Also Published As

Publication number Publication date
DE2126705A1 (en) 1971-12-09
CH547091A (en) 1974-03-29
GB1356386A (en) 1974-06-12
SE367541B (en) 1974-06-04

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