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Circular stapling device including buttress release mechanism

  • US 9,782,173 B2
  • Filed: 02/21/2014
  • Issued: 10/10/2017
  • Est. Priority Date: 03/07/2013
  • Status: Active Grant
First Claim
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1. A circular stapler comprising:

  • a handle assembly;

    an elongate body that extends from the handle assembly;

    a cartridge assembly mounted on a distal end portion of the elongate body and being movable relative to the distal end portion of the elongate body between a first position and a second position, the cartridge assembly being positioned adjacent to the distal end portion of the elongate body in the first position and spaced from the distal end portion of the elongate body in the second position, the cartridge assembly including a tissue engaging surface that extends to an annular edge;

    a cartridge buttress member having a body portion and an extension portion that extends from the body portion of the cartridge buttress member so that when the cartridge assembly is disposed in the first position, the body portion is supported on the tissue engaging surface of the cartridge assembly and the extension portion extends over the annular edge of the tissue engaging surface so that the extension portion is secured between the elongate body and the cartridge assembly to maintain the buttress member supported on the cartridge assembly; and

    a spring assembly secured between the cartridge assembly and the distal end portion of the elongate body, the spring assembly adapted to pull the cartridge assembly toward the distal end portion of the elongate body to maintain the cartridge assembly in close approximation with the distal end portion of the elongate body when the cartridge assembly is disposed in the first position, the spring assembly including at least one spring that provides a spring force sufficient to trap the extension portion of the cartridge buttress member between the elongate body and the cartridge assembly when the cartridge assembly is disposed in the first position, the at least one spring being movable with the cartridge assembly to release the extension portion of the cartridge buttress member from between the elongate body and the cartridge assembly when the cartridge assembly is moved toward the second position.

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