Patent Document ID: 9700343
Application ID: 14929971
Patent Flag: 1

Claim One:
1. A method of driving an end effector coupled to an ultrasonic drive system of a surgical instrument, the method comprising: providing, by a generator configured to drive the surgical instrument, a first electrical signal to an ultrasonic transducer acoustically coupled to the end effector; detecting, by the generator, that an impedance of the ultrasonic transducer exceeds a threshold impedance; storing, by the generator, a first local resonant frequency of the first electrical signal as a baseline resonant frequency; monitoring, by the generator, the first electrical signal against a first set of logic conditions comprising a first logic condition and a second logic condition, wherein the first logic condition is defined by a difference between a second local resonant frequency of the first electrical signal and the baseline resonant frequency that is greater than a baseline deviation threshold; determining, by the generator, that the first logic condition is met; and triggering, by the generator, a first response.