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Surgical anastomosis stapling instrument with flexible support shaft and anvil adjusting mechanism

  • US 5,609,285 A
  • Filed: 04/06/1995
  • Issued: 03/11/1997
  • Est. Priority Date: 02/07/1992
  • Status: Expired due to Term
First Claim
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1. A stapling head assembly for a circular anastomosis stapling instrument for applying a circular array of staples to tissue, comprising:

  • a staple holder for receiving a plurality of surgical staples arranged in a circular array;

    an anvil for clamping the tissue against said staple holder and forming the staples;

    an annular knife for cutting the tissue clamped between said anvil and said staple holder;

    a driver assembly including a knife driver for advancing said annular knife to cut the tissue and a staple driver for advancing the staples from said staple holder into the tissue and against said anvil; and

    said driver assembly having a first stage of operation in which said staple driver and said knife driver are engaged and advanced together to drive the staples into the tissue, a second stage of operation in which the staple driver is disengaged from said knife driver when the tissue is cut, and a third stage of operation occurring after said second stage in which said staple driver engages with said knife driver to form the staples against said anvil.

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