Electrosurgical apparatus
First Claim
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1. Electrosurgical apparatus comprising:
- an electrosurgical generator having a generator output coupled to an electrical load which includes an electrosurgical electrode unit, andat least one coupling conductor which connects the electrode unit to the generator output,wherein the generator has a resonant output network determining an operating frequency, andwherein the resonant output network has an in-line output inductor connected in series with the coupling conductor, andwherein the load is capacitive, the capacitance of the load and the output inductor together forming a series resonant output circuit having a resonant frequency which is higher than the operating frequency of the generator yet is not higher than twice the said operating frequency.
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Abstract
In electrosurgical apparatus for tissue desiccation and cutting, an electrosurgical generator has a series-connected output inductor which forms a series resonant circuit with the capacitance of the generator load, the load including an electrode unit and a cable coupled to the generator output. The series resonant frequency is typically 1.5 f where f is the operating frequency of the generator. A capacitor may be included, coupled between the conductors which connect bipolar electrodes to the generator, to increase the load capacitance. The effect of these measures is to boost the output voltage available for electrosurgical treatment, especially for tissue cutting.
1879 Citations
14 Claims
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1. Electrosurgical apparatus comprising:
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an electrosurgical generator having a generator output coupled to an electrical load which includes an electrosurgical electrode unit, and at least one coupling conductor which connects the electrode unit to the generator output, wherein the generator has a resonant output network determining an operating frequency, and wherein the resonant output network has an in-line output inductor connected in series with the coupling conductor, and wherein the load is capacitive, the capacitance of the load and the output inductor together forming a series resonant output circuit having a resonant frequency which is higher than the operating frequency of the generator yet is not higher than twice the said operating frequency. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. An electrosurgical generator having a power supply and a waveform shaping network for generating high frequency electrical power for surgical operations, the electrosurgical generator further comprising:
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an output stage having a parallel resonant output circuit forming part of a resonant output network determining an operating frequency of the generator, an output terminal for connection to an electrode unit by means of a coupling conductor, and, connected in series between the resonant output circuit and the terminal, an inductor for forming a series resonant circuit with a capacitive load when connected to the terminal, the series resonant circuit tuned to a frequency higher than the operating frequency yet not higher than twice the operating frequency. - View Dependent Claims (12, 13)
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14. An electrosurgical instrument comprising a bipolar electrode unit having inherent capacitance;
- and a handpiece mounting the electrode unit;
the handpiece including a pair of power supply conductors for delivering electrosurgical radio frequency power from a generator to the electrodes of the electrode unit, and a capacitor connected across the conductors to supplement the inherent capacitance of the electrode unit and the power supply conductors.
- and a handpiece mounting the electrode unit;
Specification