Vitrectomy probe with adjustable cutter port size
First Claim
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1. 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.
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Abstract
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. Some implementations disclosed herein include a piezoelectric element operable to adjust a position of a stroke limiter to define a size of the cutter port.
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Citations
15 Claims
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1. A vitrectomy probe comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A vitrectomy probe comprising:
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a housing defining a first pneumatic chamber and a second pneumatic chamber; 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 comprising; a cutting edge, the inner cutting member moveable within the outer cutting member 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 the cutting edge of the inner cutting member when the inner cutting member is in a fully retracted position; a first diaphragm dividing the first pneumatic chamber into a first chamber portion and a second chamber portion, the first diaphragm coupled to the inner cutting member and operable to reciprocate the inner cutting member within the outer cutting member in response to application of a pneumatic pressure to opposing sides of the first diaphragm; a second diaphragm dividing the second pneumatic chamber in to a third pneumatic chamber and a fourth pneumatic chamber; an orifice formed in a wall of the housing and providing fluid communication between the third chamber portion and an exterior of the housing; a stroke limiter operable to limit the size of the adjustable port, the stroke limiter comprising; a moveable member coupled to and moveable with the second diaphragm in response to the pneumatic pressure applied to the third chamber portion, the moveable member moveable within the housing to a selected position in which the moveable member contacts the inner cutting member to define the retracted position of the inner cutting member. - View Dependent Claims (10, 11, 12, 13, 14, 15)
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Specification