SYSTEMS AND METHODS FOR CALCULATING TISSUE IMPEDANCE IN ELECTROSURGERY

摘要

An electrosurgical generator and associated methods determine a real part of the impedance of treated tissue. The electrosurgical generator includes an output stage, a plurality of sensors, and a controller that controls the output stage. The controller includes a signal processor that determines an RMS voltage, an RMS current, an average power, and a real part of the impedance of the treated tissue based on measured voltage and current by using a plurality of averaging filters. The controller controls the output stage to generate electrosurgical energy based on at least the determined real part of the impedance.

主权项

1. An electrosurgical generator comprising:
an output stage coupled to an electrical energy source and configured to generate radio frequency (RF) electrosurgical energy; a plurality of sensors configured to sense a voltage waveform and a current waveform of the electrosurgical energy; and a controller coupled to the output stage and the plurality of sensors, the controller including:
a signal processor configured to determine a Root Mean Square (RMS) voltage, an RMS current, an average power, and a real part of an impedance based on the sensed voltage waveform and the sensed current waveform using a plurality of averaging filters; andan output controller configured to generate a control signal to control the output stage based on at least one of the RMS voltage, the RMS current, the average power, and the real part of the impedance.