Electrical generator and system
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Abstract
An electrosurgical system includes a generator for generating radio frequency power, and an electrosurgical instrument including at least three electrodes and. The generator includes a radio frequency output stage having at least a pair of RF output lines, and a power supply coupled to the output stage for supplying power to the output stage. A controller 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 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 of the electrodes, and the coagulating waveform is delivered between a second pair of the electrodes.
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Citations
29 Claims
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1. -20. (canceled)
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21. An electrosurgical system including a generator for generating radio frequency power, and an electrosurgical instrument including at least two electrodes, the generator comprising:
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(i) a radio frequency output stage having two or more output connections, each in electrical connection with a respective one of the at least two electrodes, (ii) a power supply coupled to the output stage for supplying power to the output stage, (iii) a controller operable to limit the radio frequency output voltage developed across the output connections to at least a first predetermined threshold value for cutting or vaporisation and a second threshold value for coagulation and, in a blend mode, to alternate constantly between the first and second threshold values, and (iv) adjustment means, operable by a user of the electrosurgical system, for varying the ratio of the blend mode so as to vary the part of the blend signal that is limited to the first threshold value for cutting or vaporisation, as compared with the part of the blend signal that is limited to the second threshold value for coagulation. - View Dependent Claims (22, 23)
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24. An electrosurgical system including a generator for generating radio frequency power and an electrosurgical instrument including at least two electrodes, the generator comprising:
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a radio frequency output stage having a plurality of output connections, each output connections being in electrical connection with a respective one of the at least two electrodes, a power supply coupled to the output stage for supplying radio frequency power to the output stage, a controller operable to limit the radio frequency output voltage developed across the output connections to at least a first predetermined threshold value for cutting or vaporisation and a second threshold value for coagulation and, in a blend mode, to alternate constantly between the first and second threshold values, and a switching circuit comprising;
three or more output connections, a switching device for feeding the radio frequency output voltage to the three or more output connections, such that, in the blend mode, the cutting RF waveforms is delivered between a first pair of the three or more electrodes, and the coagulating RF waveform is delivered between a second pair of the electrodes, and an adjustment device for adjusting the timing of the switching device to alter the ratio between a first part of the blended RF signal that is a cutting signal and a second part of the blended RF signal that is a coagulating signal. - View Dependent Claims (25, 26)
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27. An electrosurgical system including a generator for generating radio frequency power and an electrosurgical instrument including a cutting g electrode and first and second coagulation electrodes, the generator comprising:
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an output stage having first, second and third output connections, the first output connection being connected to the cutting electrode of the electrosurgical instrument, and the second and third output connections being connected to the first and second coagulation electrodes of the electrosurgical instrument, a power supply coupled to the output stage for supplying radio frequency power to the output stage, a controller operable to limit radio frequency output voltage developed across the output connections to a first predetermined threshold value for cutting or vaporisation and a second threshold value for coagulation and, in a blend mode, to alternate constantly between the first and second threshold values, and a switching device for supplying the radio frequency cutting signal between the cutting electrode and one of the coagulating electrodes when the switching device is in a first state, and for supplying the radio frequency coagulating voltage between the two coagulation electrodes when the switching device is in a second state, and an adjustment device for adjusting the timing of the switching device to alter the ratio between a first part of the blended RF signal that is a cutting signal and a second part of the blended RF signal that is a coagulating signal. - View Dependent Claims (28)
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29. An electrosurgical system including a generator for generating radio frequency power, and an electrosurgical instrument including three or more electrodes, the generator comprising:
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means for supplying radio frequency power, means for outputting the radio frequency output power, the output means having a plurality of output connections, each in electrical connection with a respective one of the three or more electrodes, means for limiting radio frequency output voltage developed across the output connections to at least a first predetermined threshold value for cutting or vaporisation and a second threshold value for coagulation and, in a blend mode, to alternate constantly between the first and second threshold values, switching means for delivering the radio frequency output voltage to the plurality of output connections, such that, in the blend mode, the cutting RF waveforms is delivered between a first pair of the plurality of three or more electrodes, and the coagulating RF waveform is delivered between a second pair of the electrodes, and adjustment means, operable by a user of the electrosurgical system, for varying the ratio of the blend mode so as to vary the part of the blend signal that is limited to the first threshold value for cutting or vaporisation, as compared with the part of the blend signal that is limited to the second threshold value for coagulation.
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Specification