Systems and methods for arc detection and drag adjustment

摘要

Controlling a level of electrosurgical energy provided to tissue based on detected arcing patterns or impedance changes. The drag force imposed on an electrode or blade of an electrosurgical instrument may be controlled by adjusting the level of electrosurgical energy based on the arcing patterns or impedance changes. The arcing patterns or impedance changes may be detected by sensing and analyzing voltage and/or current waveforms of the electrosurgical energy The current and/or voltage waveform analysis may involve calculating impedance based on the voltage and current waveforms and calculating changes in impedance over time. The waveform analysis may involve detecting harmonic distortion using FFTs, DFTs, Goertzel filters, polyphase demodulation techniques, and/or bandpass filters. The waveform analysis may involve determining a normalized difference or the average phase difference between the voltage and current waveforms.

主权项

1. A method of controlling electrosurgical energy provided by an electrode of an electrosurgical instrument to tissue:
delivering the electrosurgical energy to the electrode of the electrosurgical instrument; sensing arcing patterns between the electrode and the tissue; determining drag based on the arcing patterns; and controlling a level of the electrosurgical energy delivered to the electrode based on the drag and a predetermined drag value.