Circular stapling device
AssigneeCovidien LP
InventorsYuandong Tan, Xiliang Zhang
Life of this patent
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Abstract
A circular stapling device includes a manually operated trigger (24) that is adapted to allow staple formation to occur prior to cutting of tissue during a single actuation of the firing trigger (24). The stapling device (10) minimizes stretching and movement of tissue during staple formation to improve staple formation. The stapling device (10) also reduces the amount of force required to move the firing trigger (24) through a firing stroke by separating the staple formation and tissue cutting functions of the stapling device (10) to reduce stress on a clinician's hand during actuation of the stapling device (10).
Claims20
A circular stapling device comprising:
- a handle assembly including a firing trigger;
- an elongate body supported by the handle assembly, the elongate body having a proximal portion and a distal portion;
- a shell assembly supported on the distal portion of the elongate body, the shell assembly including a shell housing defining a cavity, a staple cartridge supported on the shell housing, a pusher defining a longitudinal bore, a knife carrier movable within the longitudinal bore, and a knife supported on the knife carrier, the staple cartridge supporting a plurality of staples and the pusher being movable within the cavity of the shell housing from a retracted position to an advanced position to eject the plurality of staples from the staple cartridge;
- and
- an anvil assembly supported on the distal portion of the elongate body and being movable in relation to the shell assembly between open and clamped positions;
- wherein the knife carrier engages the pusher and is movable between a retracted position and an intermediate position to move the pusher from its retracted position to its advanced position and subsequently movable from its intermediate position to an advanced position independently of the pusher to advance the knife to cut tissue.
A shell assembly comprising:
- a shell housing defining a cavity;
- a staple cartridge supported on the shell housing, the staple cartridge supporting a plurality of staples;
- a pusher defining a longitudinal bore;
- a knife carrier movable within the longitudinal bore of the pusher;
- and
- a knife supported on the knife carrier;
- wherein the pusher is movable within the cavity of the shell housing from a retracted position to an advanced position to eject the plurality of staples from the staple cartridge, and the knife carrier engages the pusher and is movable between a retracted position and an intermediate position to move the pusher from its retracted position to its advanced position and subsequently movable from its intermediate position to an advanced position independently of the pusher to advance the knife to cut tissue.
A shell assembly comprising:
- a shell housing defining a cavity;
- a staple cartridge supported on the shell housing, the staple cartridge supporting a plurality of staples;
- a pusher defining a longitudinal bore, the pusher being movable within the cavity of the shell housing from a retracted position to an advanced position to eject the plurality of staples from the staple cartridge;
- a knife carrier movable within the longitudinal bore of the pusher;
- and
- a knife supported on the knife carrier;
- wherein the knife carrier is releasably coupled to the pusher and movable independently of the pusher to cut tissue after staple formation.
Dependencies are inferred from the claim text.