#$%^&*AU2013213673A120130822.pdf#####Abstract A vitrectomy probe comprising: a housing a cutter extending longitudinally from a first end of the housing, the cutter comprising: an outer cutting member coupled to the housing an inner cutting member slideable within the outer cutting member, the inner cutting member slideable between a retracted position and an extended position and an adjustable port, a size of the adjustable port defined by an edge of an opening formed in the outer cutting member and an end surface of the inner cutting member when the inner cutting member is in a fully retracted position: an oscillator operable to reciprocate the inner cutting member and a stroke limiter operable to limit the size of the adjustable port, the stroke limiter comprising: a piezoelectric element coupled to a lead screw, the piezoelectric motor adapted to position the lead screw within the housing to engage the inner cutting member at a selected position defining the fully retracted position of the inner cutting member.
