Vitrectomy probe with adjustable cutter port size
First Claim
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1. 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 element 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.
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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. For example, one example vitrectomy probe includes a piezoelectric element adapted to adjust 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.
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Citations
20 Claims
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1. A vitrectomy probe comprising:
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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 element 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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A vitrectomy probe comprising:
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a housing; a cutter extending from a first end of the housing, the cutter comprising; a hollow outer cutting member coupled to the housing, the outer cutting member comprising an open end and a closed end; a hollow inner cutting member slideable within the outer cutting member, the inner cutting member comprising open opposing ends and a first cutting surface at a first end thereof; and an opening formed in the outer cutting member proximate an end thereof, the opening having a second cutting surface cooperative with the first cutting member to dissect materials that enter the opening, the opening and the first cutting surface defining a port, a size of the port defined by a location of the first cutting surface relative to the opening when the inner cutting member is in a fully retracted position; a pneumatic chamber formed in the housing; a diaphragm coupled to the inner cutting member and divides the pneumatic chamber into a first chamber portion and a second chamber portion, the first chamber portion in fluid communication with a first passageway and the second chamber portion in fluid communication with a second passageway, the first passageway and the second passageway adapted to transmit a first pneumatic pressure to the first chamber portion and the second chamber portion, respectively, in an alternating sequence to oscillate the diaphragm and the inner cutting member between the fully retracted position and the fully extended position; a piezoelectric element coupled to a lead screw, the piezoelectric element adapted to position the lead screw within the housing to engage the inner cutting member at a selected position defining the fully retracted position. - View Dependent Claims (13, 14, 15, 16, 17)
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18. A system comprising:
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a vitrectomy probe comprising; a housing; a cutter extending from a first end of the housing, the cutter comprising; a hollow outer cutting member coupled to the housing, the outer cutting member comprising an open end and a closed end; a hollow inner cutting member slideable within the outer cutting member, the inner cutting member comprising open opposing ends and a first cutting surface at a first end thereof; and an opening formed in the outer cutting member proximate an end thereof, the opening having a second cutting surface cooperative with the first cutting member to dissect materials that enter the opening, the opening and the first cutting surface defining a port, a size of the port defined by a location of the first cutting surface relative to the opening when the inner cutting member is in a fully retracted position; a piezoelectric element coupled to a lead screw, the piezoelectric element adapted to position the lead screw within the housing responsive to an electrical signal to engage the inner cutting member at a selected position defining the fully retracted position. an oscillator coupled to the inner cutting member and adapted to oscillate the inner cutting member between the fully retracted position and the fully extended position; a surgical console coupled to the vitrectomy probe, the console adapted to supply the electrical signal to the piezoelectric element of the vitrectomy probe based on a user input; and an input device coupled to the console, the input device adapted to receive the user input and cause the console to alter the electrical signal supplied to the piezoelectric element of the vitrectomy probe thereby altering the size of the port of the cutter. - View Dependent Claims (19, 20)
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Specification