Patent ID: 6139546
Filing Date: 2000-10-31
Classification: A61B,Y10S

Abstract:
A method for controlling power delivery in an electro-surgical instrument including a plurality of channels for delivery of an energy to a surgical site, and the method for controlling power comprising the acts of:measuring in a first time interval, the impedance of each of said channels, and each channel sequentially isolated from others of the channels to determine impedance;generating in a second time interval for each of the channels a signal proportional to an actual power in each of the channels, and the signal proportional to the actual power derived from a product of low frequency signals proportional to current and voltage of each of the channels and the low frequency signals derived from high frequency signals corresponding to a current and a voltage on each of the channels; andadjusting in the second time interval, power levels of the channels to minimize a difference between a measured value of a control parameter and a target value of the control parameter, to deliver the energy to the surgical site.