RF generator system for surgical vessel sealing
First Claim
1. A method of providing power to an electrosurgical instrument comprising:
- generating a non-sinusoidal driving voltage having a substantially constant driving frequency;
providing the non-sinusoidal driving voltage to a series LC circuit having a resonant frequency of substantially twice the substantially constant driving frequency;
generating a quasi-sinusoidal current in the series LC circuit from the non-sinusoidal driving voltage; and
providing the quasi-sinusoidal current to an electrical output, wherein the electrical output has a maximum threshold voltage of about 75 Volts, and a maximum threshold current of about 1.8 amperes, and wherein the electrical output is configured for coupling to an electrical input of a bipolar tissue-sealing surgical instrument.
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Accused Products
Abstract
Systems, methods, and apparatus for providing power to an electrosurgical instrument. In particular, a power supply is disclosed in which non-sinusoidal (e.g., pulsed) constant frequency voltage having a variable amplitude is passed to an LC circuit to produce a quasi-sinusoidal current in the LC circuit. The constant driving frequency can be one half the resonant frequency of the LC circuit allowing the LC circuit to operate as an impedance, and thus limit current spikes and arcing. The frequency and phasing of the driving voltage also enables the LC circuit to discharge energy back into a power provider of the power supply so that energy does not build up in the LC circuit. These features result in less severe current spikes and arcing, as well as reduced cutoff times.
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Citations
21 Claims
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1. A method of providing power to an electrosurgical instrument comprising:
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generating a non-sinusoidal driving voltage having a substantially constant driving frequency; providing the non-sinusoidal driving voltage to a series LC circuit having a resonant frequency of substantially twice the substantially constant driving frequency; generating a quasi-sinusoidal current in the series LC circuit from the non-sinusoidal driving voltage; and providing the quasi-sinusoidal current to an electrical output, wherein the electrical output has a maximum threshold voltage of about 75 Volts, and a maximum threshold current of about 1.8 amperes, and wherein the electrical output is configured for coupling to an electrical input of a bipolar tissue-sealing surgical instrument. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A power supply for an electrosurgical instrument comprising:
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a power provider configured to provide a non-sinusoidal voltage at a substantially constant driving frequency and a variable amplitude; a series LC circuit configured to receive the non-sinusoidal voltage and provide a quasi-sinusoidal current, and wherein the resonant frequency of the series LC circuit is substantially twice that of the substantially constant driving frequency; and an electrical output configured to provide the quasi-sinusoidal current to a bipolar tissue-sealing electrosurgical instrument;
whereinthe series LC circuit is further configured to present an impedance to the quasi-sinusoidal current in the series LC circuit that limits current spikes and voltage transient spikes during load fluctuations. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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Specification