Patent ID: 8196796
Filing Date: 2012-06-12
Classification: A61B

Abstract:
1. A surgical instrument comprising: an end effector having a selectively reciprocatable implement movably supported therein, said implement being selectively advanceable in a distal direction upon application of a rotary actuation motion thereto and retractable in a proximal direction upon application of a rotary retraction motion thereto; an elongate shaft assembly coupled to said end effector and including a rotatable drive shaft operably engaged with said reciprocatable implement for transmitting said rotary actuation motion and rotary retraction motion thereto, said rotatable drive shaft including a first gear and a second gear; and a firing drive comprising: interfacing with said first gear to apply said rotary actuation motion thereto when activated; and operably engaged with said second gear to apply said rotary retraction motion thereto when said first rotary drive member is deactivated and said second rotary drive member is activated.