Cameron R. Nott,Foster B. Stulen,Fergus P. Quigley,John E. Brady,Gregory A. Trees,Amrita S. Sawhney,Patrick J. Scoggins,Kristen G. Denzinger,Craig N. Faller,Madeleine C. Jayme,Alexander R. Cuti,Matthe
申请号：
US16144383
公开号：
US20190274706A1
申请日:
2018.09.27
申请国别(地区):
US
年份:
2019
代理人:
摘要：
Various aspects of a generator, ultrasonic device, and method for estimating and controlling a state of an end effector of an ultrasonic device are disclsoed. The ultrasonic device includes an electromechanical ultrasonic system defined by a predetermined resonant frequency, including an ultrasonic transducer coupled to an ultrasonic blade. A control circuit measures a complex impedance of an ultrasonic transducer, wherein the complex impedance is defined asThe control circuit receives a complex impedance measurement data point and compares the complex impedance measurement data point to a data point in a reference complex impedance characteristic pattern. The control circuit then classifies the complex impedance measurement data point based on a result of the comparison analysis and assigns a state or condition of the end effector based on the result of the comparison analysis. The control circuit estimates the state of the end effector of the ultrasonic device and controls the state of the end effector of the ultrasonic device based on the estimated state.
