Patent ID: 6203518
Filing Date: 2001-03-20
Classification: A61B,A61F

Abstract:
An apparatus for removing tissue from a patient comprising: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 repeatedly and cyclically moving the operative tip including means for rotating the fragmenting surface and means for reciprocating the fragmenting surface at an ultrasonic frequency;an interface circuit; andsaid interface circuit including means adapted to be connecting to any one of a plurality of sources of control signals, means for substantially matching the input impedance of said interface circuit to the output impedance of said any one of a plurality of control signals and means for generating at least one control signal from the any one of a source of control signals to control at least one of an ultrasonic driven and a rotational driver;the size of excursions of the tip in said second direction being controlled by at least one of said at least one control signals.