CPC A61B 17/320068 (2013.01) [A61B 2017/0015 (2013.01); A61B 2017/00017 (2013.01); A61B 2017/00154 (2013.01)] | 18 Claims |
1. A method of controlling an ultrasonic surgical tool to reduce presence of a harmonic signal, the method comprising:
driving the ultrasonic surgical tool with a first drive signal, the ultrasonic surgical tool exhibiting a harmonic signal as a result of being driven with the first drive signal;
measuring a voltage across the ultrasonic surgical tool and a current through the ultrasonic surgical tool that relate to the first drive signal;
comparing the measured voltage to the measured current to acquire a characteristic of the harmonic signal resulting from driving the ultrasonic surgical tool with the first drive signal;
generating a cancellation signal based on the acquired characteristic of the harmonic signal;
combining the first drive signal and the cancellation signal to produce a second drive signal, the second drive signal being sinusoidal; and
driving the ultrasonic surgical tool with the second drive signal such that presence of the harmonic signal resulting from driving the ultrasonic surgical tool with the second drive signal is reduced relative to presence of the harmonic signal resulting from driving the ultrasonic surgical tool with the first drive signal.
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