Electrosurgical generator and system
First Claim
1. An electrosurgical generator for supplying power to an electrosurgical instrument, the generator comprising:
- a radio frequency output stage having at least a pair of electrosurgical output connections for the delivery of radio frequency power to the instrument and a radio frequency switching device for delivering the radio frequency power to the output connections, and control circuitry operable to limit the radio frequency peak output voltage developed across the output connections to at least a first predetermined threshold value for coagulation and second predetermined threshold value for cutting or vaporization and, in a blend mode of the generator, to alternate constantly between said first and second threshold values, and to activate the radio frequency switching device when the radio frequency peak output voltage has reached the first predetermined threshold value during coagulation or the second predetermined threshold value during cutting or vaporization, and thereby, to reduce the delivered output power, said first and second threshold values, and, thus, the peak output voltages for coagulation and cutting or vaporization, being different from one another.
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Accused Products
Abstract
An electrosurgical system including an electrode assembly having two electrodes for use immersed in an electrically conductive fluid has a generator with control circuitry for rapidly reducing the delivered radio frequency output power by at least 50% within at most a few cycles of the peak radio frequency output voltage reaching a predetermined threshold limit. In this way, tissue coagulation can be performed in, for example, saline without significant steam generation. The same peak voltage limitation technique is used in a tissue vaporization or cutting mode to limit the size of the steam pocket at the electrodes and to avoid electrode burning. In a blended mode, the output voltage is alternately limited to a value appropriate for coagulation and a value appropriate for cutting or vaporization.
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Citations
8 Claims
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1. An electrosurgical generator for supplying power to an electrosurgical instrument, the generator comprising:
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a radio frequency output stage having at least a pair of electrosurgical output connections for the delivery of radio frequency power to the instrument and a radio frequency switching device for delivering the radio frequency power to the output connections, and control circuitry operable to limit the radio frequency peak output voltage developed across the output connections to at least a first predetermined threshold value for coagulation and second predetermined threshold value for cutting or vaporization and, in a blend mode of the generator, to alternate constantly between said first and second threshold values, and to activate the radio frequency switching device when the radio frequency peak output voltage has reached the first predetermined threshold value during coagulation or the second predetermined threshold value during cutting or vaporization, and thereby, to reduce the delivered output power, said first and second threshold values, and, thus, the peak output voltages for coagulation and cutting or vaporization, being different from one another. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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Specification