Simplified spring load mechanism for delivering shaft force of a surgical instrument

摘要

A connection mechanism and manufacturing method for a surgical instrument includes an inner shaft member (4800) that extends at least partially through an elongated shaft member of the instrument and defines proximal and distal ends and is selectively movable in a longitudinal direction with respect to the elongated shaft member and includes at least one aperture (4811) that extends partially along the longitudinal direction and disposed distally from the proximal end. The inner shaft member enables a drive collar member (4840) to slide on the inner shaft member (4800) and reciprocate along the longitudinal direction. A drive collar stop member (4841) slides on the inner shaft member (4800) and moves along the longitudinal direction. The drive collar stop member (4841) then moves in a direction relative to the longitudinal axis to engage the aperture (4811) and limit further longitudinal motion of the drive collar member. An inner shaft stop member limits movement of the inner shaft.