METHOD AND SYSTEM FOR ADJUSTING SOURCE IMPEDANCE AND MAXIMIZING OUTPUT BY RF GENERATOR

摘要

An electrosurgical system includes an electrosurgical probe connected to a control console, wherein the probe is capable of coagulating and ablating tissue depending on a selected operating mode. Before operating the system, probe-specific data stored in a memory device associated with the probe is read by a processing device in the console. The data includes source impedance values specific to a coagulation or cutting mode of operation. A constant duty cycle value for a modulated cutting mode also is provided. Depending on the operating mode selected, an RF generator adjusted to have a predetermined source impedance value provides a voltage value to the probe. During the duty-cycled mode, the RF generator generates an instantaneous voltage value output for a duty cycle portion that is less than 100% of a time period, which value is no less than a maximum continuous average voltage value for the electrosurgical probe.

主权项

1. Method of controlling source impedance of an RF generator in a control console for an electrosurgical system including an electrosurgical RF probe, the control console being in communication with a memory device associated with the RF probe, the method comprising the steps of:
connecting the electrosurgical RF probe to the control console having the RF generator, the memory device associated with the RF probe providing probe-specific data stored in the memory device to a processing device in the control console, the probe data comprising at least a first source impedance value corresponding to a coagulation operating mode for the RF probe and a second source impedance value corresponding to a cutting operating mode for the RF probe; selecting the coagulation operating mode or the cutting operating mode, the processing device operating so that the source impedance of the RF generator has a source impedance value corresponding to the first source impedance value when the coagulation operating mode is selected by an operator and so that the source impedance of the RF generator has the second source impedance value when the cutting operating mode is selected by an operator; and operating the RF probe to coagulate or cut tissue at a surgical site.