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WO1989003661A1 - Trocart avec verrou ameliore - Google Patents

Trocart avec verrou ameliore Download PDF

Info

Publication number
WO1989003661A1
WO1989003661A1 PCT/US1988/003710 US8803710W WO8903661A1 WO 1989003661 A1 WO1989003661 A1 WO 1989003661A1 US 8803710 W US8803710 W US 8803710W WO 8903661 A1 WO8903661 A1 WO 8903661A1
Authority
WO
WIPO (PCT)
Prior art keywords
shield
trigger
obturator
trocar
leaf spring
Prior art date
Application number
PCT/US1988/003710
Other languages
English (en)
Inventor
William A. Holmes
Peter F. Costa
Original Assignee
Endotherapeutics
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Priority claimed from US07/133,013 external-priority patent/US4830405A/en
Application filed by Endotherapeutics filed Critical Endotherapeutics
Publication of WO1989003661A1 publication Critical patent/WO1989003661A1/fr

Links

Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods
    • A61B17/34—Trocars; Puncturing needles
    • A61B17/3494—Trocars; Puncturing needles with safety means for protection against accidental cutting or pricking, e.g. limiting insertion depth, pressure sensors
    • A61B17/3496—Protecting sleeves or inner probes; Retractable tips
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods
    • A61B17/34—Trocars; Puncturing needles
    • A61B17/3474—Insufflating needles, e.g. Veress needles

Definitions

  • This invention relates to surgical instruments. More particularly, it relates to a trocar assembly with an improved protective shield latch.
  • Trocars are sharp-pointed instruments used to puncture a body cavity. This is often done so that fluids may be drained using a cannula inserted into the opening. Trocars are also used during endoscopic procedures.
  • a conventional endoscopic procedure follows three steps. The first step is the insertion of a Veress cannula into an abdominal cavity through a small incision in the abdominal wall. The cavity is inflated with insufflating gas passed through the cannula. After inflation, the Veress cannula is removed. Finally, a standard trocar housed within the bore of a trocar tube is thrust into the inflated abdomen. Standard trocars are shaped like a large metal peg with a sharpened point.
  • the present invention provides a trocar assembly that, is improved over the above-described trocars with respect to the operation of a protective shield latching mechanism.
  • one aspect of the invention is a trocar assembly comprising an elongate trocar obturator having a piercing tip at its front end.
  • a tubular protective shield is mounted concentrically around the obturator between a normally extended position in which the obturator tip is covered and a retracted position in which the obturator tip is exposed.
  • a biasing means acts on the rear end of the protective shield, whereby the shield is forced to the retracted position to expose the piercing tip when the trocar is being inserted through the wall of a body cavity and is biased by the biasing means to the extended position to shield the piercing tip once the trocar has pierced the wall.
  • Means are included for preventing the shield from moving from the extended posi ⁇ tion toward the retracted position.
  • a trigger means is coupled to the preventing means and operable between a lock position in which the prevent- ing means is effective, and a release position for defeat ⁇ ing the preventing means and allowing the shield to move from the extended position toward the retracted position.
  • Means for defeating the trigger means is provided for re ⁇ activating the preventing means when the shield is returned from the retracted position to the extended posi ⁇ tion while the trigger means is maintained in the release position.
  • Fig. 1 is an isometric view of a preferred embodiment of the trocar assembly of the present invention.
  • Fig. 2 is an enlarged sectional view taken along line 2-2 in Fig. 1.
  • Figs. 3-6 are partial cross-sectional views taken from above in Fig. 2 illustrating operation of the latch mechanism of the embodiment of Fig. 1.
  • trocar assembly that is basically composed of two parts: a trocar subassembly 12 and a trocar tube subassembly 14.
  • the two subassemblies are interfitting, but designed to be separable from each other.
  • the basic elements of trocar subassembly 12 are a hollow housing forming a grip or head 16 composed of nesting halves 18 and 20; an obturator 22 having a piercing tip 24; a generally tubular obturator sleeve or shield 26; a spring 28 for biasing the shield; and a latching mechanism shown generally at 30.
  • Head 16 has a rounded rear wall 16a that fits comfortably into the palm of the hand and a generally rectangular front wall 16b.
  • Wall 16b has a shoulder 16c that defines a forward raised section shown generally at 16d.
  • the two halves 18 and 20 are generally symmetrical and snap fit together with four posts 18a extending transversely from the inner wall of half 18.
  • the head has a central axial chamber 32 for receiving the obturator and shield. Chamber 32 terminates in a generally triangular- shaped recess 34 (as viewed in Fig. 3) having a narrow neck 34a formed in the inner face of the rear wall into which a matingly formed rear end 22a of the obturator shaft fits to hold the obturator in head 16.
  • the front wall 16b has a circular opening 32a that is defined by a collar 16e and which opens into chamber 32.
  • spring 28 encircles the rear end o"f the obturator shaft with its ends seated against the inner face of the rear wall of the grip and the rear end wall of the shield.
  • the side face of head half 18 has an axially elongate opening 36.
  • Formed as part of the rear end of shield 26 is a protrusion or lip 26a which extends radi ⁇ ally from the shield in line with the joint between head halves 18 and 20.
  • Extending upwardly and rearwardly from the rear end of the shield is a position-indicating finger 26b which extends into opening 36 for indicating the posi ⁇ tion of the shield relative to the obturator.
  • a bore 38 Disposed in head half 20, generally opposite from the position of lip 26a is a bore 38. Extending through this bore for sliding movement relative to head 16 along an axis parallel with the longitudinal axis'of the shield and obturator is a trigger 40. Trigger 40 extends through raised section 16d with an exposed forward extending tip. The end of the trigger in chamber 32 is biased toward bore 38 by a spring 42 which extends between the end of the trigger and the rear wall of head 16 in head half 20. A rod section 40a is formed in the end of the trigger and extends toward the rear wall of chamber 32 and is sized to be received in spring 42 for aiding in holding the spring in alignment against the end of the trigger.
  • the trigger is further maintained in alignment relative to the chamber by a guide 20a positioned next to the side of the trigger and another guide 18b extending from the face of head half 18 adjacent opening 36 to the corresponding surface of the trigger.
  • the end of spring 42 disposed against the rear inner wall of head half 20 is held in position by a partial channel 20b in which it is seated and an arm 18c extending from head half 18 and seating against the spring end seated against the inner wall.
  • the side of the trigger adjacent to guide 20a has three generally planar sections.
  • a guide section 40b is disposed parallel with and adjacent guide 20a.
  • An inter ⁇ mediate section 40c is slightly recessed from section 40b, except for a ridge 40d disposed at the end of section 40c adjacent to the exposed tip of the trigger.
  • a further recessed end section 40e is also adjacent to the forward side of ridge 40d.
  • a leaf spring member 44 Opposite from trigger 40 in the portion of chamber 32 defined by head half 20 is a leaf spring member 44.
  • Member 44 has a general narrow V- shape with the base 44a of the "V" seated in a correspond ⁇ ingly V-shaped cavity 46 in head half 20.
  • One leg of the spring member is pressed against the side of chamber 32.
  • the end 44b of the other leg is free standing and disposed adjacent collar 16e where it seats in a. block position against lip 26a of the shield when the trigger is positioned in what is referred to as a lock position with the exposed trigger tip extended.
  • the leaf spring member thus is also referred to as a second biasing means for biasing end 44b in the block position.
  • End 44b is accord- ingly also referred to as a stop or means for preventing the shield from moving to the extended position.
  • Leaf spring member 44 has a bend 44c in it intermediate the V- base and end 44b. This bend puts the intermediate portion of the leaf spring member closer to trigger 40.
  • a portion or arm 44d, also referred to as link means, of member 44 extends toward trigger 40.
  • the distal end or tip 44e of arm 44d has a slight curve, with the curved portion seated on trigger side portion 40c and against ridge 40d with the trigger in the lock position and the shield in the extended position as shown in Fig. 3.
  • trocar tube subassembly 14 The basic elements of trocar tube subassembly 14 are: a main body 50 composed of two generally symmetrical halves 52 and 54 that are held together by appropriate fastening means; an axially elongate trocar tube 56; and a 'flap valve mechanism 58.
  • the rear end of body 50 has a rectangular recess 50a that mates with raised section 16d on the front end of the grip of the trocar subassembly when the two subassemblies are interfitted.
  • a front wall 50b of the body is curved to facilitate gripping the trocar with the fingers and has a circular opening 60 defined by a collar 50c in which the trocar tube is mounted.
  • the rear end of opening 60 expands into a circumferential groove 62 into which a collar 56a on the rear end of the trocar tube is seated to fix the tube within collar 50c.
  • a rear wall 50d of the body has a central circular opening 64 in which a rubber grommet 66 is seated.
  • Grom- et 66 has a central opening 68 coextensive with opening 64.
  • the obturator and shield are sized to pass through the central grommet opening with the grommet forming a seal around the shield.
  • Body 50 has an inner cavity 70 into which openings 60 and 64 open and in which flap valve mechanism 58 is mounted.
  • the flap valve mechanism includes a U-shaped flapper 72, a shaft 74 which traverses the cavity and on which the flapper is carried, a spring 76 disposed about one end of the shaft, and an actuating lever/indicator 78 carried on one end of the shaft exteriorly of the body.
  • the exterior of the body at the location of the indicator has a fan shaped recess 80 in which the indicator moves.
  • the flapper valve opens, allowing the obturator and sleeve to be fully inserted in trocar tube 56.
  • the indicator thus swings from a position indicating that opening 68 is sealed to a position indicating it is open.
  • a lower lip lining an edge of the recessed rear wall 50d has a nipple 82 extending inwardly.
  • the lower,outwardly facing edge adjacent raised portion 16d corresponding in position to the nipple has a slot 84 in which the nipple travels during normal use of the trocar assembly with the two subassemblies joined.
  • the trocar assembly operates and is used as follows. Prior to use, the trocar assembly will typically be in the assembled form shown in Figs. 1-3 with the raised rectangular section 16d fitting into recess 50a, and with the obturator and shield inserted through the opening in grommet 66, cavity 70, and the lumen of trocar tube 56.
  • the trocar shield is normally locked in its extended position as shown in Figs. 1-3 for safety purposes and for storage. In this position the piercing tip is shielded and cannot be damaged by inadvertent contact with other surfaces.
  • spring 28 biases shield 26 forwardly with lip 26a limiting the forward travel by contact against the inner surface of front wall 16b.
  • the bias of leaf spring member 44 keeps end 44b seated against lip 26a, preventing rearward movement of the shield.
  • head 16 is pressed toward main body 50 to the position shown in Fig. 4.
  • raised section 16d With the exposed tip of trigger 40 protruding, is inserted into recess portion 50a.
  • Rear wall 50d is forced against the tip of the trig ⁇ ger, causing the trigger to retract into chamber 32 to what is referred to as a release position.
  • This movement usually takes place when the shield and obturator tip are placed against an incision in the skin and pressure is exerted against the skin by pressing against head 16.
  • Pressure on the head of the trocar assembly concurrently shifts the trigger to the release position while applying force against the skin tissue. The tip enters the inci ⁇ sion and underlying tissue with continued pressure.
  • leaf spring member arm 44d As the trigger moves to the release position, end 44e of leaf spring member arm 44d is carried with it since ridge 40d prevents the end from sliding along the trigger side. This puts arm 44d in a more perpendicular alignment across chamber 32, forcing free end 44b laterally away from the shield, and therefore away from lip 26a, as shown in Fig. 4. With leaf spring member end 44b displaced from lip 26a, shield 26 is free to move rearwardly, exposing obturator tip 24. The force of the body cavity wall tis ⁇ sue on the shield forces it into the retracted position shown in Fig. 5.
  • the trocar subassembly may be withdrawn from the trocar tube subassembly once the cavity has been penetrated. In this operation, pressure is released from head 16.
  • Spring 42 is strong enough to push the sub- assemblies apart, thereby returning the trigger to the lock position shown in Fig. 3 with the leaf spring member arm end 44e back in place against trigger side section 40c.
  • the obturator and shield are slid out of trocar tube 56 and main body 50.
  • Spring 76 then forces flapper 72 against grommet 66, sealing opening 68. Air pressure within the body cavity is thus maintained.
  • body half 52 of body 50 is equipped with a stopcock port 82 into which the nozzle of a stopcock (not shown) is inserted.
  • the stopcock will normally be closed during the trocar insertion to maintain the gas pressure within the body cavity. If necessary, the stopcock may be used as a conduit for passing additional insufflating gas into the cavity.
  • surgical instruments may be inserted into the body cavity via the trocar tube sub- assembly to view internal tissues, perform operations thereon, or drain body fluids.
  • Indicator 78 may be used as a handle to manually open valve flapper 76 to facilitate such activities and also permit the removal of specimens and to deflate the cavity.

Landscapes

  • Health & Medical Sciences (AREA)
  • Surgery (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Biomedical Technology (AREA)
  • Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
  • Engineering & Computer Science (AREA)
  • Pathology (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Medical Informatics (AREA)
  • Molecular Biology (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Surgical Instruments (AREA)

Abstract

Un trocart (10) comprend un obturateur allongé (22) ayant une pointe de perçage (24) à son extrémité frontale, un tube allongé (56) dans lequel l'obturateur (22) est logé, et une protection tubulaire (26) montée concentriquement autour de l'obturateur (22) entre une position normalement étendue dans laquelle la pointe (24) de l'obturateur est recouverte et une position rétractée dans laquelle la pointe (24) de l'obturateur est exposée. Un ressort (28) agit sur la protection tubulaire (26), laquelle est forcée de prendre la position rétractée pour exposer la pointe de perçage (24) lorsque le trocart (10) est introduit au travers de la paroi de la cavité du corps et qu'il est sollicité par le ressort (28) pour prendre la position étendue et protéger la pointe de perçage (24) une fois que le trocart a percé la paroi. Une protrusion (26a) s'étend radialement depuis la protection tubulaire (26). Un élément de ressort à lame (44) possède une extrémité ancrée sur l'obturateur (22) et une seconde extrémité (44b) sollicitée pour être en contact avec la protrusion (26a) de manière à empêcher le mouvement de la protection tubulaire (26) de la position étendue vers la position rétractée lorsque l'élément (44) est en contact avec la protrusion (26a).
PCT/US1988/003710 1987-10-26 1988-10-21 Trocart avec verrou ameliore WO1989003661A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US07/133,013 US4830405A (en) 1987-03-17 1987-10-26 Method of validating data entered on a ticket and the like
US133,013 1987-10-26

Publications (1)

Publication Number Publication Date
WO1989003661A1 true WO1989003661A1 (fr) 1989-05-05

Family

ID=22456617

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1988/003710 WO1989003661A1 (fr) 1987-10-26 1988-10-21 Trocart avec verrou ameliore

Country Status (1)

Country Link
WO (1) WO1989003661A1 (fr)

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5066288A (en) * 1988-07-06 1991-11-19 Ethicon, Inc. Safety trocar
EP0474124A3 (en) * 1990-08-30 1992-03-18 Ethicon Inc. Safety mechanism for trocar
EP0511676A3 (en) * 1991-04-30 1993-01-13 United States Surgical Corporation Safety trocar
GB2258401A (en) * 1991-06-18 1993-02-10 Rocket Of London Ltd Lock device for use in a pneumoperitoneal needle
EP0546769A3 (en) * 1991-12-13 1993-12-22 Minnesota Mining & Mfg Locking insufflation needle
US5318585A (en) * 1990-10-05 1994-06-07 United States Surgical Corporation Safety trocar
US5318580A (en) * 1990-09-11 1994-06-07 Origin Medsystems, Inc. Retractable trocar
US5399167A (en) * 1988-07-06 1995-03-21 Ethicon, Inc. Safety trocar
US5441513A (en) * 1992-03-12 1995-08-15 United States Surgical Corporation Retracting tip trocar assembly
US5474539A (en) * 1991-02-07 1995-12-12 Origin Medsystems, Inc. Trocar with retracting tip
EP0673233A4 (fr) * 1992-11-30 1996-06-12 Neomedix Corp Appareil d'extraction du cristallin.
GB2297488A (en) * 1995-02-02 1996-08-07 Microsurgical Equipment Ltd Trocar obturator guard
WO2003041598A1 (fr) * 2001-11-13 2003-05-22 Neosurg Technologies Trocart equipe d'une soupape a clapet amelioree
US8048099B2 (en) 2006-05-27 2011-11-01 Aesculap Ag Surgical obturator
US8057502B2 (en) 2006-05-27 2011-11-15 Aesculap Ag Surgical obturator
US8105348B2 (en) 2006-12-14 2012-01-31 Aesculap Ag Surgical obturator

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4645030A (en) * 1983-03-24 1987-02-24 O&K Orenstein & Koppel Aktiengesellschaft Multi-function directional handle

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4645030A (en) * 1983-03-24 1987-02-24 O&K Orenstein & Koppel Aktiengesellschaft Multi-function directional handle

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of EP0383830A4 *

Cited By (24)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5066288A (en) * 1988-07-06 1991-11-19 Ethicon, Inc. Safety trocar
AU633413B2 (en) * 1988-07-06 1993-01-28 Ethicon Inc. Improved trocar with valve
US5399167A (en) * 1988-07-06 1995-03-21 Ethicon, Inc. Safety trocar
EP0474124A3 (en) * 1990-08-30 1992-03-18 Ethicon Inc. Safety mechanism for trocar
US5114407A (en) * 1990-08-30 1992-05-19 Ethicon, Inc. Safety mechanism for trocar
GR910100355A (el) * 1990-08-30 1992-08-31 Ethicon Inc Μηχανισμος ασφαλειας για τροκαρ.
US5318580A (en) * 1990-09-11 1994-06-07 Origin Medsystems, Inc. Retractable trocar
US5318585A (en) * 1990-10-05 1994-06-07 United States Surgical Corporation Safety trocar
US5474539A (en) * 1991-02-07 1995-12-12 Origin Medsystems, Inc. Trocar with retracting tip
US6497716B1 (en) 1991-04-30 2002-12-24 United States Surgical Corporation Safety trocar
EP0511676A3 (en) * 1991-04-30 1993-01-13 United States Surgical Corporation Safety trocar
US5486190A (en) * 1991-04-30 1996-01-23 United States Surgical Corporation Safety trocar
US5295993A (en) * 1991-04-30 1994-03-22 United States Surgical Corporation Safety trocar
US7169159B2 (en) 1991-04-30 2007-01-30 United States Surgical Corporation Safety trocar
GB2258401A (en) * 1991-06-18 1993-02-10 Rocket Of London Ltd Lock device for use in a pneumoperitoneal needle
US5374252A (en) * 1991-12-13 1994-12-20 Minnesota Mining And Manufacturing Company Locking pneumoneedle
EP0546769A3 (en) * 1991-12-13 1993-12-22 Minnesota Mining & Mfg Locking insufflation needle
US5441513A (en) * 1992-03-12 1995-08-15 United States Surgical Corporation Retracting tip trocar assembly
EP0673233A4 (fr) * 1992-11-30 1996-06-12 Neomedix Corp Appareil d'extraction du cristallin.
GB2297488A (en) * 1995-02-02 1996-08-07 Microsurgical Equipment Ltd Trocar obturator guard
WO2003041598A1 (fr) * 2001-11-13 2003-05-22 Neosurg Technologies Trocart equipe d'une soupape a clapet amelioree
US8048099B2 (en) 2006-05-27 2011-11-01 Aesculap Ag Surgical obturator
US8057502B2 (en) 2006-05-27 2011-11-15 Aesculap Ag Surgical obturator
US8105348B2 (en) 2006-12-14 2012-01-31 Aesculap Ag Surgical obturator

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