Cartridge assembly for a surgical stapling instrument

• US 4,700,703 A
• Filed: 03/27/1986
• Issued: 10/20/1987
• Est. Priority Date: 03/27/1986
• Status: Expired due to Fees

• Current Assignee: Semion Resnick
• Original Assignee: Semion Resnick
• Inventors: Goldman, Jacob, Resnick, Semion
• Primary Examiner(s): Thaler, Michael H.
• Application Number:
  US06/844,949
• Time in Patent Office: 572 Days
• Field of Search: 128/334 R, 128/334 C, 128/305, 227/DIG. 1, 227/19, 227/155
• US Class Current: 227/176.1
• CPC Class Codes: A61B 17/115 Staplers for performing anastomosis in a single operation
• CPC Class Codes: A61B 17/1155 Circular staplers comprising a plurality of staples
• CPC Class Codes: A61B 2017/00862 elastic or resilient for sutures A61B2017/0618

Abstract

A disposable cartridge assembly for a surgical stapling instrument wherein an anvil carrying component comprises constituent anvil elements articulated with respect to each other and presenting an annular anvil surface. A biasing element is provided for biassing the elements into a retracted position wherein the anvil surface has a first diameter. A locking element is provided for releasable interengagement with the anvil elements so as to maintain them in an expanded position against the biassing force wherein the anvil surface has a second larger diameter and so as to lock said elements against relative displacement, the arrangement being such that upon disengagement of the locking element from the anvil elements, the latter are displaced under the biassing force into the retracted position.

Claims

1. In a disposable cartridge assembly for a surgical stapling instrument, an anvil carrying component comprising constituent anvil segments, each segment being integrally secured at one end thereof to a central hub portion by a relatively flexible linkage and being formed, at an opposite end thereof with a component anvil surface so as to form together a composite anvil surface, each anvil segment being formed, adjacent said opposite end with a slot which together form a groove, said segments being flexibly displaceable between a retracted and an expanded position;

a compression band tightly fitted around said segments for biasing said segments into said retracted position wherein said composite anvil surface has a first diameter, and a locking ring adapted to fit into said groove so as to maintain said segments in their expanded position wherein said composite anvil surface has a second larger diameter, said ring being formed with a succession of tooth-like projections adapted to project into the spaces between the segments so as to prevent movement of the segments with respect to each other and being formed of a semi-rigid plastics material such that it can be penetrated by an instrument scalpel knife edge which is thereafter frictionally gripped by the ring material, the arrangement being such that upon displacement of said instrument scalpel gripped by said ring material away from said anvil carrying component said locking ring is disengaged from said anvil segments and the latter are displaced under said biasing force into said retracted position.

2. An anvil carrying component according to claim 1 and furthermore comprising a bored anvil base member to which an instrument adjusting rod is adapted to be coupled, said base member being articulated to said anvil hub portion so as to permit for relative rotational displacement between them.

3. In a disposable cartridge assembly for a surgical stapling instrument, an anvil carrying component comprising constituent anvil segments, each segment being integrally secured at one end thereof to a central hub portion by a relatively flexible linkage and being formed, at an opposite end thereof with a component anvil surface so as to form together a composite anvil surface, each anvil segment being formed, adjacent said opposite end with a slot which together form a groove, said segments being flexibly displaceable between a retracted and an expanded position;

a compression band tightly fitted around said segments for biasing said segments into said retracted position wherein said composite anvil surface has a first diameter, and a locking ring adapted to fit into said groove so as to maintain said segments in their expanded position wherein said composite anvil surface has a second larger diameter, said ring being formed with a succession of tooth-like projections adapted to project into the spaces between the segments so as to prevent movement of the segments with respect to each other, a bored anvil base member to which an instrument adjusting rod is adapted to be coupled, said base member being articulated to said anvil hub portion so as to permit for relative rotational displacement between them, said hub portion being formed with a circular bead which is adapted to be snap-fitted into a corresponding groove formed in an adjacent surface in said base member so as to allow for said relative rotational displacement, the arrangement being such that upon disengagement of said locking ring from said anvil segments, the latter are displaced under said biasing force into said retracted position.

4. An anvil carrying component according to claim 3 wherein said ring is formed of a semi-rigid plastics material such that it can be penetrated by the instrument scalpel knife edge which is thereafter frictionally gripped by the ring material.