US3577991A - Sewing tissue instruments or the like - Google Patents

Sewing tissue instruments or the like Download PDF

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Publication number
US3577991A
US3577991A US3577991DA US3577991A US 3577991 A US3577991 A US 3577991A US 3577991D A US3577991D A US 3577991DA US 3577991 A US3577991 A US 3577991A
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Grant
Patent type
Prior art keywords
forceps
member
thread
shield
end
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.)
Expired - Lifetime
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Inventor
Guilbert Roland Wilkinson
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GUILBERT ROLAND WILKINSON
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GUILBERT ROLAND WILKINSON
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B25HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25BTOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
    • B25B7/00Pliers; Other hand-held gripping tools with jaws on pivoted limbs; Details applicable generally to pivoted-limb hand tools
    • B25B7/18Adjusting means for the operating arms
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/04Surgical instruments, devices or methods, e.g. tourniquets for suturing wounds; Holders or packages for needles or suture materials
    • A61B17/06Needles ; Sutures; Needle-suture combinations; Holders or packages for needles or suture materials
    • A61B17/062Needle manipulators
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/28Surgical forceps
    • A61B17/2812Surgical forceps with a single pivotal connection
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B25HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25BTOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
    • B25B7/00Pliers; Other hand-held gripping tools with jaws on pivoted limbs; Details applicable generally to pivoted-limb hand tools
    • B25B7/06Joints
    • B25B7/08Joints with fixed fulcrum
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B25HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25BTOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
    • B25B7/00Pliers; Other hand-held gripping tools with jaws on pivoted limbs; Details applicable generally to pivoted-limb hand tools
    • B25B7/14Locking means
    • B25B7/16Locking means combined with means for tightening the operating arms of jaws

Abstract

A forceps or like instrument having a covering shield attached to each member or leg at its pivoted end so as to cover any opening between engaging surfaces or projection at or about where each member or leg pivots, so that thread or the like employed with the forceps will be prevented from dropping into an opening between the surfaces or about the projections on the forceps.

Description

United States Patent Guilbert Roland Wilkinson 10 Ari-an Road, Hamilton, New Zealand [21] Appl. No. 797,971

[72] Inventor [22] Filed Feb. 10, 1969 [45] Patented May 11, 1971 [32] Priority Nov. 12, 1968 [33] New Zealand [31] 154,454

[54] SEWING TISSUE INSTRUMENTS OR THE LIKE 1 Claim, 4 Drawing Figs.

52 u.s.c1 128/340, 81/416 511 1m.c1 A6lb17/04, B25b7/06 so FieldofSearch 30/134,

References Cited UNITED STATES PATENTS 10/ l 895 Ruppertz 12/1955 Tabrah....

2/ 1962 Daniel FOREIGN PATENTS 6/1931 Germany Primary Examiner-Channing L. Pace Attorney-Young and Thompson ABSTRACT: A forceps or like instrument having a covering shield attached to each member or leg at its pivoted end so as to cover any opening between engaging surfaces or projection at or about where each member or leg pivots, so that thread or the like employed with the forceps will be prevented from dropping into an opening between the surfaces or about the projections on the forceps.

PATENTED111111 1 1911 FIGS.

I 1 6 INVENTOR Gwzmse'r ff/z/w/vsa/v BY TJM ATTOR NEY6' l. SEWING TISSUE INSTRUMENTS OR THE LIKE This invention relates to improvements in sewing tissue instruments such as needle-holding forceps.

ln suturing or stitching tissue together, when the needle is passed through the tissue to be sewn the needle end of the thread is passed several times around the body of the forceps, (generally three times), and then the other end of the thread is gripped by jaws of the forceps. This end of the thread is then drawn through loops thus made, and the two ends are pulled together to tighten the thread against the tissue.

To complete a knot, one or more turns can be made around the body of the forceps reversewise to the first several, e.g. three loops. The ends are again pulled tight to complete the knot against tissue. This can be repeated if desired.

It has been found that it is while sliding the loops down the body of the forceps that the thread will snag on the slightest projection on or crack formed by the positioning of parts of the forceps.

The hinge part of any present needle-holding or suturing forceps is made so that when the forceps are opened to grip the thread that has passed through the sides of the wound, the cracks or opening surfaces between parts of the forceps become wider and the thread, on numerous occasions, is trapped and snagged when the forceps are closed. This prevents the free running of the thread, so the knot to seal the wound cannot be completed, or sometimes even started.

The object of the present invention is to provide a forceps or like instrument having such a construction and/or arrangement of its parts that will ensure of the thread or other sewing materialnot snagging on a hinge joint or on any point of the instrument when suturing or stitching, providing a freerunning surface for the suturing material.

Generally the invention consists of a forceps or like instrument having a covering shield attached to each member or leg at its pivoted end so as to cover any opening between engaged surfaces or projection at or about where each member or leg pivots so that thread or the like employed with the forceps will be prevented from dropping into an opening between surfaces or about projections of the forceps.

In further describing the construction and function of the invention, reference will be made hereinafter to the accompanying drawing in which:

FIG. 1 is a perspective plan view of the forceps in the closed position,

FIG. 2 is a similar view of a main part of the forceps in an opened position,

FIG. 3 is a side view of the forceps, and

FIG. 4 is an enlarged cross section taken on the line 4-4 in FIG. 1.

In giving effect to the invention, as a preferred embodiment, the forceps generally consists of two members l0, ll of a relatively narrow cross section, which members are pivoted together upon a screw 12 towards their outer ends or jaws 13,

14 and a spring 15 is set between the members 10, 11 to normally hold such outer ends or jaws open. These jaws l3, 14 open fairly widely relative to one another and are formed so as to take and grip the fine surgical thread employed.

Dependent upon this opening is each forceps member 10 or 11 formed by being cut back to allow for the mutual cooperation of the other member. In this respect is the length of the shield 16 of each member determined.

Preferably the shield 16 of each member is made of a suitable thin material such as fine gauge sheet copper strip, stainless steel or any suitable metal or plastic material. This strip has a width to suit the side of each forceps member, in plan view, and the strip is gradually curved at its ends to a narrowed extremity. This can be effected after the strip has been positioned along the member 10 or 11 over the pivot screw 12 and brazed, welded or silver-soldered to the member. The joints are then ground and polished 011' to suit the periphery of the cross section of the member at the localities of the joints and so as to give a very smooth finish.

Each member 10 or having such a shield, the latter extends across openings between pivot areas of the members.

Thus the thread 7 on being employed with my improved forceps cannot be trapped or snagged, but slides easily down to the end of the forceps, and the free end of the thread can now be pulled through the loops as earlier mentioned to make the first and second part of the knot.

Finally it is to be understood that the term forceps" is intended to include all needle-holding forceps as Gillies, l-legar, Mosquito, Spencer Wells, etc., or any instrument used in the sewing of wounds, or eye-suturing forceps, or those used in tying surgeons knots or other kinds of knots for tying up tissues.

It is pertinent to this patent that where desired all needleholding forceps can be adapted by having the snagproof shield fitted to them. In the manufacture of new needle-holding forceps the hinge may be ground down on each side so that the shield may fit in more snugly and so not make the shield part thicker.

' Instead of the screw 12, a plain pin or axle for the hinge can be held in place by the shields 15 on both sides of the members or legs.

lclaim:

1. In a forceps or the like comprising a pair of members each of which has a jaw and a handle portion, and means pivotally securing said members together for opening and closing movement of the jaws relative to each other about an axis upon manipulation of the handle portions; the improvement comprising a pair of shields fixedly secured to opposite sides of the forceps one on each said member, each said shield being a thin, flat strip of material that extends from over the jaw of one member, across the other member at said axis, and

- terminates over the handle portion of said one member, one

end of the strip being secured to the jaw of said one member.

Claims (1)

1. In a forceps or the like comprising a pair of members each of which has a jaw and a handle portion, and means pivotally securing said members together for opening and closing movement of the jaws relative to each other about an axis upon manipulation of the handle portions; the improvement comprising a pair of shields fixedly secured to opposite sides of the forceps one on each said member, each said shield being a thin, flat strip of material that extends from over the jaw of one member, across the other member at said axis, and terminates over the handle portion of said one member, one end of the strip being secured to the jaw of said one member.
US3577991A 1968-11-12 1969-02-10 Sewing tissue instruments or the like Expired - Lifetime US3577991A (en)

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NZ15445468 1968-11-12

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DE (1) DE1956665A1 (en)
GB (1) GB1257869A (en)

Cited By (40)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4392494A (en) * 1979-02-14 1983-07-12 Ashby Richard L Ligature tying instrument
US4949717A (en) * 1988-03-17 1990-08-21 Shaw Edward L Surgical instrument with suture cutter
US5342375A (en) * 1993-01-27 1994-08-30 Lemole Gerald M Needle gripping apparatus
US5496335A (en) * 1993-08-25 1996-03-05 Inlet Medical, Inc. Insertable suture passing grasping probe and methodology for using same
US5507758A (en) * 1993-08-25 1996-04-16 Inlet Medical, Inc. Insertable suture grasping probe guide, and methodology for using same
US5591163A (en) * 1995-06-14 1997-01-07 Incont, Inc. Apparatus and method for laparoscopic urethropexy
US5643288A (en) * 1995-06-14 1997-07-01 Incont, Inc. Apparatus and method for laparoscopic urethropexy
US5662654A (en) * 1995-06-14 1997-09-02 Incont, Inc. Bone anchor, insertion tool and surgical kit employing same
US5697931A (en) * 1995-06-14 1997-12-16 Incont, Inc. Apparatus and method for laparoscopic urethopexy
US5827299A (en) * 1993-08-25 1998-10-27 Inlet Medical, Inc Insertable suture passing grasping probe and methodology for using same
US6030402A (en) * 1998-04-23 2000-02-29 Thompson; Ronald J. Apparatus and methods for the penetration of tissue, and the creation of an opening therein
US6042583A (en) * 1995-06-14 2000-03-28 Medworks Corporation Bone anchor-insertion tool and surgical method employing same
US6447527B1 (en) 1998-04-23 2002-09-10 Ronald J. Thompson Apparatus and methods for the penetration of tissue
US20030181800A1 (en) * 2002-03-20 2003-09-25 Bonutti Peter M. Methods of securing body tissue
US20040167548A1 (en) * 2001-12-03 2004-08-26 Bonutti Peter M. Magnetic suturing system and method
US20060030868A1 (en) * 2004-08-05 2006-02-09 Bennett Richard M Iii Laparoscopic port site closure tool
US20060241695A1 (en) 2000-03-13 2006-10-26 Bonutti Peter M Method of using ultrasonic vibration to secure body tissue with fastening element
US20080039845A1 (en) * 2006-02-07 2008-02-14 Bonutti Peter M Methods and devices for intracorporeal bonding of implants with thermal energy
US20080114399A1 (en) * 2000-05-03 2008-05-15 Bonutti Peter M Method of securing body tissue
CN100574712C (en) 2007-04-04 2009-12-30 中国医学科学院北京协和医院 Forceps type stitching instrument
WO2012144950A1 (en) * 2011-04-18 2012-10-26 Frimand Roennow Carl-Fredrik Surgical forceps
US8496657B2 (en) 2006-02-07 2013-07-30 P Tech, Llc. Methods for utilizing vibratory energy to weld, stake and/or remove implants
US8617185B2 (en) 2007-02-13 2013-12-31 P Tech, Llc. Fixation device
US8808329B2 (en) 1998-02-06 2014-08-19 Bonutti Skeletal Innovations Llc Apparatus and method for securing a portion of a body
US8845687B2 (en) 1996-08-19 2014-09-30 Bonutti Skeletal Innovations Llc Anchor for securing a suture
US8845699B2 (en) 1999-08-09 2014-09-30 Bonutti Skeletal Innovations Llc Method of securing tissue
US8926639B2 (en) 2009-01-12 2015-01-06 Teleflex Medical Incorporated Apparatus and methods for tissue closure
US9060767B2 (en) 2003-04-30 2015-06-23 P Tech, Llc Tissue fastener and methods for using same
US9089323B2 (en) 2005-02-22 2015-07-28 P Tech, Llc Device and method for securing body tissue
US9138222B2 (en) 2000-03-13 2015-09-22 P Tech, Llc Method and device for securing body tissue
US9173647B2 (en) 2004-10-26 2015-11-03 P Tech, Llc Tissue fixation system
US20150313618A1 (en) * 2012-12-13 2015-11-05 Kaoru Horikawa Medical instrument
US9226828B2 (en) 2004-10-26 2016-01-05 P Tech, Llc Devices and methods for stabilizing tissue and implants
US9271766B2 (en) 2004-10-26 2016-03-01 P Tech, Llc Devices and methods for stabilizing tissue and implants
US9439642B2 (en) 2006-02-07 2016-09-13 P Tech, Llc Methods and devices for utilizing bondable materials
US9463012B2 (en) 2004-10-26 2016-10-11 P Tech, Llc Apparatus for guiding and positioning an implant
US9750496B2 (en) 2002-08-27 2017-09-05 P Tech, Llc System for securing a portion of a body
US9782163B2 (en) 2012-01-04 2017-10-10 Teleflex Medical Incorporated Apparatus and methods for tissue closure
US9888916B2 (en) 2004-03-09 2018-02-13 P Tech, Llc Method and device for securing body tissue
US9980761B2 (en) 2015-09-25 2018-05-29 P Tech, Llc Tissue fixation system and method

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10101425B4 (en) * 2001-01-13 2005-09-08 Aesculap Ag & Co. Kg A surgical instrument

Citations (4)

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Publication number Priority date Publication date Assignee Title
US547292A (en) * 1895-10-01 Artery-forceps
DE527109C (en) * 1929-06-01 1931-06-13 Martin Loth Apparatus for inhibiting blood vessel lying deep
US2726657A (en) * 1954-02-08 1955-12-13 Frank L Tabrah X-joint for surgical instruments
US3022787A (en) * 1960-05-09 1962-02-27 Leota M Daniel Tool for rectal treatment

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US547292A (en) * 1895-10-01 Artery-forceps
DE527109C (en) * 1929-06-01 1931-06-13 Martin Loth Apparatus for inhibiting blood vessel lying deep
US2726657A (en) * 1954-02-08 1955-12-13 Frank L Tabrah X-joint for surgical instruments
US3022787A (en) * 1960-05-09 1962-02-27 Leota M Daniel Tool for rectal treatment

Cited By (72)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4392494A (en) * 1979-02-14 1983-07-12 Ashby Richard L Ligature tying instrument
US4949717A (en) * 1988-03-17 1990-08-21 Shaw Edward L Surgical instrument with suture cutter
US5342375A (en) * 1993-01-27 1994-08-30 Lemole Gerald M Needle gripping apparatus
US5496335A (en) * 1993-08-25 1996-03-05 Inlet Medical, Inc. Insertable suture passing grasping probe and methodology for using same
US5507758A (en) * 1993-08-25 1996-04-16 Inlet Medical, Inc. Insertable suture grasping probe guide, and methodology for using same
US5954734A (en) * 1993-08-25 1999-09-21 Inlet Medical, Inc. Insertable suture passing grasping probe and methodology for using same
US5827299A (en) * 1993-08-25 1998-10-27 Inlet Medical, Inc Insertable suture passing grasping probe and methodology for using same
US6183485B1 (en) 1993-08-25 2001-02-06 Inlet Medical, Inc. Insertable suture passing grasping probe and methodology for using same
US5697931A (en) * 1995-06-14 1997-12-16 Incont, Inc. Apparatus and method for laparoscopic urethopexy
US5643288A (en) * 1995-06-14 1997-07-01 Incont, Inc. Apparatus and method for laparoscopic urethropexy
US5591163A (en) * 1995-06-14 1997-01-07 Incont, Inc. Apparatus and method for laparoscopic urethropexy
US6042583A (en) * 1995-06-14 2000-03-28 Medworks Corporation Bone anchor-insertion tool and surgical method employing same
US5662654A (en) * 1995-06-14 1997-09-02 Incont, Inc. Bone anchor, insertion tool and surgical kit employing same
US8845687B2 (en) 1996-08-19 2014-09-30 Bonutti Skeletal Innovations Llc Anchor for securing a suture
US8808329B2 (en) 1998-02-06 2014-08-19 Bonutti Skeletal Innovations Llc Apparatus and method for securing a portion of a body
US6447527B1 (en) 1998-04-23 2002-09-10 Ronald J. Thompson Apparatus and methods for the penetration of tissue
US6030402A (en) * 1998-04-23 2000-02-29 Thompson; Ronald J. Apparatus and methods for the penetration of tissue, and the creation of an opening therein
US8845699B2 (en) 1999-08-09 2014-09-30 Bonutti Skeletal Innovations Llc Method of securing tissue
US9067362B2 (en) 2000-03-13 2015-06-30 P Tech, Llc Method of using ultrasonic vibration to secure body tissue with fastening element
US9884451B2 (en) 2000-03-13 2018-02-06 P Tech, Llc Method of using ultrasonic vibration to secure body tissue
US8747439B2 (en) 2000-03-13 2014-06-10 P Tech, Llc Method of using ultrasonic vibration to secure body tissue with fastening element
US20060241695A1 (en) 2000-03-13 2006-10-26 Bonutti Peter M Method of using ultrasonic vibration to secure body tissue with fastening element
US9138222B2 (en) 2000-03-13 2015-09-22 P Tech, Llc Method and device for securing body tissue
US20080114399A1 (en) * 2000-05-03 2008-05-15 Bonutti Peter M Method of securing body tissue
US8814902B2 (en) 2000-05-03 2014-08-26 Bonutti Skeletal Innovations Llc Method of securing body tissue
US20040167548A1 (en) * 2001-12-03 2004-08-26 Bonutti Peter M. Magnetic suturing system and method
US9770238B2 (en) * 2001-12-03 2017-09-26 P Tech, Llc Magnetic positioning apparatus
US9808318B2 (en) 2002-03-20 2017-11-07 P Tech, Llc Robotic arthroplasty system
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US9271779B2 (en) 2002-03-20 2016-03-01 P Tech, Llc Methods of using a robotic spine system
US9271741B2 (en) 2002-03-20 2016-03-01 P Tech, Llc Robotic ultrasonic energy system
US9192395B2 (en) 2002-03-20 2015-11-24 P Tech, Llc Robotic fastening system
US20030181800A1 (en) * 2002-03-20 2003-09-25 Bonutti Peter M. Methods of securing body tissue
US9155544B2 (en) 2002-03-20 2015-10-13 P Tech, Llc Robotic systems and methods
US9629687B2 (en) 2002-03-20 2017-04-25 P Tech, Llc Robotic arthroplasty system
US9149281B2 (en) 2002-03-20 2015-10-06 P Tech, Llc Robotic system for engaging a fastener with body tissue
US9585725B2 (en) 2002-03-20 2017-03-07 P Tech, Llc Robotic arthroplasty system
US9750496B2 (en) 2002-08-27 2017-09-05 P Tech, Llc System for securing a portion of a body
US9962162B2 (en) 2003-04-30 2018-05-08 P Tech, Llc Tissue fastener and methods for using same
US9060767B2 (en) 2003-04-30 2015-06-23 P Tech, Llc Tissue fastener and methods for using same
US9888916B2 (en) 2004-03-09 2018-02-13 P Tech, Llc Method and device for securing body tissue
US9775593B2 (en) 2004-08-05 2017-10-03 Teleflex Medical Incorporated Laparoscopic port site closure tool
US8992549B2 (en) 2004-08-05 2015-03-31 Teleflex Medical Incorporated Laparoscopic port site closure tool
US20060030868A1 (en) * 2004-08-05 2006-02-09 Bennett Richard M Iii Laparoscopic port site closure tool
US9271766B2 (en) 2004-10-26 2016-03-01 P Tech, Llc Devices and methods for stabilizing tissue and implants
US9867706B2 (en) 2004-10-26 2018-01-16 P Tech, Llc Tissue fastening system
US9814453B2 (en) 2004-10-26 2017-11-14 P Tech, Llc Deformable fastener system
US9226828B2 (en) 2004-10-26 2016-01-05 P Tech, Llc Devices and methods for stabilizing tissue and implants
US9463012B2 (en) 2004-10-26 2016-10-11 P Tech, Llc Apparatus for guiding and positioning an implant
US9173647B2 (en) 2004-10-26 2015-11-03 P Tech, Llc Tissue fixation system
US9545268B2 (en) 2004-10-26 2017-01-17 P Tech, Llc Devices and methods for stabilizing tissue and implants
US9579129B2 (en) 2004-10-26 2017-02-28 P Tech, Llc Devices and methods for stabilizing tissue and implants
US9089323B2 (en) 2005-02-22 2015-07-28 P Tech, Llc Device and method for securing body tissue
US9439642B2 (en) 2006-02-07 2016-09-13 P Tech, Llc Methods and devices for utilizing bondable materials
US8496657B2 (en) 2006-02-07 2013-07-30 P Tech, Llc. Methods for utilizing vibratory energy to weld, stake and/or remove implants
US9173650B2 (en) 2006-02-07 2015-11-03 P Tech, Llc Methods and devices for trauma welding
US9743963B2 (en) 2006-02-07 2017-08-29 P Tech, Llc Methods and devices for trauma welding
US20080039845A1 (en) * 2006-02-07 2008-02-14 Bonutti Peter M Methods and devices for intracorporeal bonding of implants with thermal energy
US9421005B2 (en) 2006-02-07 2016-08-23 P Tech, Llc Methods and devices for intracorporeal bonding of implants with thermal energy
US9610073B2 (en) 2006-02-07 2017-04-04 P Tech, Llc Methods and devices for intracorporeal bonding of implants with thermal energy
US9402668B2 (en) 2007-02-13 2016-08-02 P Tech, Llc Tissue fixation system and method
US8617185B2 (en) 2007-02-13 2013-12-31 P Tech, Llc. Fixation device
CN100574712C (en) 2007-04-04 2009-12-30 中国医学科学院北京协和医院 Forceps type stitching instrument
US9636105B2 (en) 2009-01-12 2017-05-02 Teleflex Medical Incorporated Apparatus and methods for tissue closure
US8926639B2 (en) 2009-01-12 2015-01-06 Teleflex Medical Incorporated Apparatus and methods for tissue closure
WO2012144950A1 (en) * 2011-04-18 2012-10-26 Frimand Roennow Carl-Fredrik Surgical forceps
US9782163B2 (en) 2012-01-04 2017-10-10 Teleflex Medical Incorporated Apparatus and methods for tissue closure
US20150313618A1 (en) * 2012-12-13 2015-11-05 Kaoru Horikawa Medical instrument
US9931130B2 (en) * 2012-12-13 2018-04-03 Charmant Co., Ltd. Medical instrument
US9980717B2 (en) 2015-06-18 2018-05-29 P Tech, Llc Device and method for securing body tissue
US9980761B2 (en) 2015-09-25 2018-05-29 P Tech, Llc Tissue fixation system and method

Also Published As

Publication number Publication date Type
DE1956665A1 (en) 1970-06-18 application
GB1257869A (en) 1971-12-22 application

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