System and method for controlling an ultrasonic tool

Disclosed herein is a console for controlling an ultrasonic surgical tool to reduce presence of a ) harmonic signal, the console comprising: a controller configured to: drive the ultrasonic surgical tool with a first drive signal; acquire characteristics of the harmonic signal in the ultrasonic surgical tool resulting from driving the ultrasonic surgical tool with the first drive signal; generate a cancellation signal based on the acquired characteristics of the harmonic signal; combine the cancellation signal with the first drive signal to produce a second drive signal; drive the ultrasonic surgical tool with the second drive signal; compare the presence of the harmonic signal within a current of the ultrasonic surgical tool resulting from driving the ultrasonic surgical tool with the second drive signal to a predetermined threshold; and based on the comparison, generate and drive the ultrasonic surgical tool with a third drive signal that reduces the presence of the harmonic signal within the current of the ultrasonic surgical tool relative to the presence of the harmonic signal within the current of the ultrasonic surgical tool resulting from driving the ultrasonic surgical tool with the second drive signal.