Removal of tissue
First Claim
Patent Images
1. A method comprising the steps of:
- connecting a handpiece having a fragmenting tip to a source of control signals through an interface circuit;
selecting the input impedance of the interface circuit to be placed in circuit between the source of control signals and the handpiece;
obtaining at least one control signal from the interface circuit;
inserting the fragmenting tip having fragmenting surfaces through an opening in the eye into the lens of an 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; 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;
said second value being different than the first value and being in the ultrasonic frequency range;
said at least one signal controlling the amplitude of reciprocal movement of the operative tip.
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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 tiop 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.
149 Citations
5 Claims
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1. A method comprising the steps of:
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connecting a handpiece having a fragmenting tip to a source of control signals through an interface circuit; selecting the input impedance of the interface circuit to be placed in circuit between the source of control signals and the handpiece; obtaining at least one control signal from the interface circuit; inserting the fragmenting tip having fragmenting surfaces through an opening in the eye into the lens of an 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; 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; said second value being different than the first value and being in the ultrasonic frequency range; said at least one signal controlling the amplitude of reciprocal movement of the operative tip. - View Dependent Claims (2, 3, 4, 5)
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Specification