Patent ID: 11864756
Assignee: CILAG GMBH INTERNATIONAL
Field: Medical technology (Instruments)
Classification: CPC A | IPC A  F

Claim 19:
20. A surgical instrument, comprising:
a surgical end effector comprising a firing member configured to be actuated longitudinally;
an upper chain-drive assembly coupled to a top portion of said firing member;
a lower chain-drive assembly coupled to a bottom portion of said firing member; and
a rotary drive member comprising a helical drive feature formed on a circumference thereof, wherein said helical drive feature operably interfaces with said upper chain-drive assembly and said lower chain-drive assembly on opposing ends of said helical drive feature to thereby maintain a gap between said upper and lower chain-drive assemblies and to cause said upper chain-drive assembly to apply an upper drive motion to said firing member and said lower chain-drive assembly to apply a lower drive motion to said firing member to move said firing member between a starting position and an ending position within said surgical end effector.