Patent ID: 9724118
Date: 2017-08-08
CPC Classifications: A61B,F04C

Claim:
1. A method of driving an end effector coupled to an ultrasonic drive system of an ultrasonic surgical instrument, the method comprising: receiving a trigger signal; in response to the trigger signal, providing a first drive signal to the ultrasonic drive system to drive the end effector at a first power level; maintaining the first drive signal for a first period; at an end of the first period, providing a second drive signal to the ultrasonic drive system to drive the end effector at a second power level less than the first power level; after modifying the drive signal to the second power level, deactivating the ultrasonic surgical instrument; after deactivating the ultrasonic surgical instrument, receiving a second trigger signal; determining that a rest time has not passed since the deactivating of the ultrasonic surgical instrument; and re-activating the ultrasonic surgical instrument by generating a third drive signal at a power level less than the first power level.