Buttress attachment for circular stapling device

摘要

A circular stapling device includes a circular anvil assembly and a circular cartridge assembly. The anvil assembly includes a cap and head. The cap is movable relative to the head. The head supports a crush ring member that is movable into engagement with the cap to move the cap to an unapproximated position relative to the head to release a portion of an anvil buttress member supported between the anvil cap and the anvil head. The cartridge assembly includes a housing, a pusher member, a retaining ring member, and a fastener cartridge. The retaining ring member releasably secures a portion of a cartridge buttress member to one or both of the housing and the fastener cartridge. The retaining ring member releases the cartridge buttress member when the retaining ring member moves from a radially constricted condition to a radially expanded condition in response to a movement of the pusher member.

主权项

1. A circular stapling device, 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, the cartridge assembly including:
a housing;a pusher member supported within the housing and being movable between a first position and a second position;a retaining ring member supported on the housing and being configured and arranged to move between a radially constricted condition and a radially expanded condition in response to movement of the pusher member; anda fastener cartridge body supported on the housing and having a tissue engaging surface that extends to an annular edge; anda circular cartridge buttress member having a body portion and an extension portion, the body portion being supported on the tissue engaging surface of the fastener cartridge body, the extension portion extending from the body portion and over the annular edge of the tissue engaging surface, the retaining ring member securing the extension portion against at least one of the fastener cartridge body and the housing when in the radially constricted condition, the retaining ring member releasing the extension portion when the retaining ring member moves to the expanded condition in response to a movement of the pusher member from the first position to the second position so that the body portion of the cartridge buttress separates from the tissue engaging surface of the fastener cartridge body.