Patent ID: 8545529

Claim:
A vitrectomy probe comprising: a housing; a cutter extending 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 first chamber formed in the housing, the first chamber comprising a first chamber portion and a second chamber portion; a pneumatic pressure applied to the second chamber portion; a moveable element longitudinally moveable relative to the inner cutting member within the first chamber in response to the pneumatic pressure within the second chamber portion, the moveable element adapted to be positioned within the housing to engage the inner cutting member at a selected position defining the retracted position of the inner cutting member; and an orifice in communication with the second chamber portion and an exterior of the housing.