Removal of tissue
First Claim
Patent Images
1. A method comprising the steps of:
- inserting a fragmenting tip having fragmenting surfaces through an opening in an eye into a lens of the eye having a cataract and a capsular wall wherein the tip has at least one movable fragmenting surface;
moving the fragmenting surface in a first direction and in at least a second direction;
the step of moving the fragmenting surface in a first direction including the step of rotating the fragmenting surface at a first value of cycles per second sufficient to twist fibrous material until said fibrous material fails; and
the step of moving the fragmenting surface in a second direction including the step of reciprocating the fragmenting surface at a second value of cycles per second sufficient to cause cavitation of hydrated material;
said second value being different than the first value and being in the ultrasonic frequency range.
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Accused Products
Abstract
To reduce damage to surrounding tissue while fragmenting some tissue such as for example not damaging the capsular wall while removing the lens during cataract removal surgery or not damaging artery or vein walls during bypass surgery while freeing the artery or vein to be transplanted, an incision is made for the insertion of surface--a handpiece tip. The tip is rotated and reciprocated ultrasonically at the same time so that tissue is fragmented by the combined motion of a fragmenting surface perpendicular to the surface and at an angle to the surface many times during a single revolution or part of a revolution.
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Citations
11 Claims
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1. A method comprising the steps of:
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inserting a fragmenting tip having fragmenting surfaces through an opening in an eye into a lens of the eye having a cataract and a capsular wall wherein the tip has at least one movable fragmenting surface; moving the fragmenting surface in a first direction and in at least a second direction; the step of moving the fragmenting surface in a first direction including the step of rotating the fragmenting surface at a first value of cycles per second sufficient to twist fibrous material until said fibrous material fails; and the step of moving the fragmenting surface in a second direction including the step of reciprocating the fragmenting surface at a second value of cycles per second sufficient to cause cavitation of hydrated material; said second value being different than the first value and being in the ultrasonic frequency range. - View Dependent Claims (2, 3, 4, 5)
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6. An apparatus for removing tissue from a patient comprising:
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means for fragmenting and aspirating tissue having an operative tip; said means for fragmenting and aspirating tissue comprising means for repeatedly and cyclically moving the operative tip under the control of an electrical signal at a low power level in a first direction and in at least a second direction, wherein the number of cycles per unit time in the first direction is different than in the second direction; said operative tip having at least one fragmenting surface; the means for moving the fragmenting surface in a first direction including means for rotating the fragmenting surface at a speed sufficient to twist fibrous tissue to failure and; the means for moving the fragmenting surface in a second direction including means for reciprocating the fragmenting surface at an ultrasonic frequency sufficiently to cause cavitation. - View Dependent Claims (7, 8, 9, 10, 11)
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Specification