| 摘要 |
An electrosurgical system includes a generator (10) for generating radio frequency power, and an electrosurgical instrument (12) including at least three electrodes (2) (3) and (40). The generator includes a radio frequency output stage having at least a pair of RF output lines (60C), and a power supply (66) coupled to the output stage for supplying power to the output stage. A controller (72) is operable to limit the radio frequency output voltage developed across the output lines to at least a first predetermined threshold value to produce a cutting RF waveform, and a second threshold value to produce a coagulating RF waveform. In a combined mode, the controller (72) delivers both cutting and coagulating waveforms, either simultaneously or by alternating constantly between the first and second threshold values to form a blended signal. The system also includes means for feeding the waveform to the three or more electrodes such that the cutting RF waveform is delivered between a first pair (2, 3) of the electrodes, and the coagulating waveform is delivered between a second pair (3, 40) of the electrodes.
|
