Patent ID: 11877750
Assignee: COVIDIEN LP
Field: Medical technology (Instruments)
Classification: CPC A | IPC A

Claim 0:
1. A surgical stapling device comprising:
an elongate body having a distal portion and a proximal portion;
an anvil retainer extending from the distal portion of the elongate body;
a tool assembly supported on the distal portion of the elongate body, the tool assembly including an anvil assembly having an annular staple forming surface and a shell assembly having an annular staple cartridge, the anvil assembly coupled to the anvil retainer and being movable with the anvil retainer to move the tool assembly between an open position in which the annular staple forming surface of the anvil assembly is spaced from the annular staple cartridge of the shell assembly and a clamped position in which annular staple forming surface of the anvil assembly is in juxtaposed opposition to the annular staple cartridge of the shell assembly, the shell assembly further including a staple pusher and an annular knife that are movable in relation to the annular staple cartridge between retracted and advanced positions to eject staples from the annular staple cartridge and cut tissue; and
a handle assembly including a body portion, a manually operated approximation mechanism including a drive screw, and a motorized firing mechanism, the approximation mechanism coupled to the anvil retainer and manually operable to retract the anvil retainer into the shell assembly to move the tool assembly from the open position to the clamped position, the firing mechanism including a fire screw positioned about the drive screw and a motor that is activated to advance the fire screw longitudinally about the drive screw to move the staple pusher and the annular knife between their retracted and advanced positions, wherein the drive screw and the fire screw define axes that are coaxial.