Ultrasonic surgical tool capable of vibrating in plural modes and a drive system that induces non-linear vibrations in the tool tip

摘要

#$%^&*AU2020213394A120200827.pdf#####ABSTRACT An assembly for vibrating a tip of an ultrasonic handpiece, the handpiece having a driver to which an AC drive signal is applied to vibrate the tip, the tip being designed to vibrate in plural vibratory modes, the assembly including: an assembly for generating a variable AC drive signal that is applied to the driver of the handpiece; an assembly for measuring a voltage of the drive signal applied across the handpiece; an assembly for measuring a current through the handpiece; and a processor configured to: for each vibratory mode of the tip, adjust a frequency characteristic ("first frequency characteristic") for the vibratory mode based on the measured drive signal voltage and the measured current through the handpiece, the frequency characteristics as adjusted for at least two of the vibratory modes being different from each other; and based on the frequency characteristic as adjusted ("second frequency characteristic") for each of the vibratory modes, determine a structure of a waveform for the drive signal and assert a command based on the structure of the waveform to the assembly that generates the drive signal so as to cause the assembly to generate a drive signal that contains a component for each of the vibratory modes, each component being based on the second frequency characteristic determined for the vibratory mode.1113 LU + WUJ J _j zD Eo+