Patent ID: 8252012
Filing Date: 2012-08-28
Classification: A61B

Abstract:
1. A surgical instrument, comprising: a transducer configured to produce vibrations along a longitudinal axis at a predetermined frequency in response to a modulated drive signal; an end effector coupled to the transducer extending along the longitudinal axis, the end effector comprising a body having a proximal end and a distal end, the distal end is movable relative to the longitudinal axis by the vibrations produced by the transducer; and a multiplier-type modulator comprising a first input to receive a current set point signal and a second input to receive a modulation waveform, the multiplier-type modulator configured to generate a modulated drive signal by forming the product of the current set point signal and the modulation waveform, wherein the distal end of the end effector is movable in response to the vibrations produced by the transducer in response to the modulated drive signal.