Vitrectomy probe with adjustable cutter port size

摘要

Vitrectomy probes and system related thereto are disclosed herein. The disclosure describes various example vitrectomy probes having an adjustable cutting port size. Various example features are described for adjusting the size of the cutting port. Further, the disclosure provides examples for adjusting the size of the cutter port while the vitrectomy probe is in operation.

主权项

1. A vitrectomy probe comprising:
a housing; a chamber formed in the housing; a cutter extending longitudinally from a first end of the housing, the cutter comprising:
an outer cutting member coupled to the housing;an interior assembly comprising an inner cutting member slideable within the outer cutting member, the interior assembly slideable between a retracted position and an extended position; andan 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; a motor operable to reciprocate the interior assembly; an arrangement comprising:
a piston disposed in the chamber and moveably therein, the piston comprising a first geared surface; anda first gear operably engaged with the first geared surface of the piston and rotatable in a first rotational direction in response to movement of the piston in a first direction and rotatable in a second rotational direction in response to movement of the piston in a second direction opposite the first direction; a stroke limiter threadably engaged with the housing and configured to engage one of an end of the interior assembly or a surface of the motor to define the size of the adjustable port, the stroke limiter moveable in a third direction to decrease a size of the adjustable port and moveably in a fourth direction opposite the third direction to increase a size of the adjustable port, the stroke limiter comprising a geared surface operably engaged with the first gear, the stroke limiter moveable in the third direction in response to a movement of the piston in the first direction and moveable in the fourth direction in response to a movement of the piston in the second direction.