US Patent 11786241 Surgical stapling device including a hydraulic staple formation mechanism

A shell assembly includes a shell housing defining a cavity, a plurality of staples, a staple cartridge supported on the shell housing, a pusher assembly positioned within the cavity of the shell housing, and a hydraulic piston configured to engage the pusher assembly to impart axial displacement to the pusher assembly and form a fluid tight seal against the shell housing. The staple cartridge defines slots that receive the plurality of staples. The pusher assembly includes a plurality of pushers arranged in an annular configuration to eject the plurality of staples from the staple cartridge. Supply of a fluid into the cavity of the shell housing advances the hydraulic piston, which, in turn, advances the pusher assembly to eject the plurality of staples from the staple cartridge.