Electrosurgical generator and system
First Claim
1. An electrosurgical system comprising:
- an electrosurgical generator for generating radio frequency (RF) power at a generator operating frequency, andan electrosurgical instrument coupled to the generator,the generator comprising a single source of RF power with a multiple-phase RF output stage having at least three outputs for coupling to respective electrodes of the electrosurgical instrument for delivering RF power to the electrodes, the configuration of the output stage being such that respective continuous RF output voltage waveforms are simultaneously delivered across respective pairs of said three generator outputs at the operating frequency, each such waveform being phase-displaced between 10°
-170°
with respect to the waveforms delivered across the respective other pairs of the three outputs,the electrosurgical instrument comprising at least three treatment electrodes, each treatment electrode being coupled to a respective one of the generator outputs for receiving RF power from the output stage of the generator, andthe generator being constructed and arranged, such that the magnitude of the RF output voltage waveforms delivered to at least first and second pairs of said generator outputs being sufficient to allow simultaneous tissue cutting and coagulation at the respective treatment electrodes connected to the first and second pairs of said generator outputs when the system is used for tissue treatment.
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Accused Products
Abstract
An electrosurgical system has an electrosurgical generator with a multiple-phase RF output stage coupled to a multiple-electrode electrosurgical instrument. The instrument has three treatment electrodes each of which is coupled to a respective generator output driven from, for instance, a three-phase output transformer. Continuous RF output voltage waveforms are simultaneously delivered to respective generator outputs at the operating frequency, each waveform being phase-displaced with respect to the other waveforms. The magnitude of the RF output voltage waveform delivered to at least one of the generator outputs is sufficient to cause tissue vaporization at the respective treatment electrodes when the system is used for tissue treatment. Also disclosed is an electrosurgical generator in which the output transformer has windings forming at least three phases, the transformer core being constructed to provide at least three magnetic circuits each of which is inductively linked to the windings of at least two of the three phases.
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Citations
27 Claims
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1. An electrosurgical system comprising:
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an electrosurgical generator for generating radio frequency (RF) power at a generator operating frequency, and an electrosurgical instrument coupled to the generator, the generator comprising a single source of RF power with a multiple-phase RF output stage having at least three outputs for coupling to respective electrodes of the electrosurgical instrument for delivering RF power to the electrodes, the configuration of the output stage being such that respective continuous RF output voltage waveforms are simultaneously delivered across respective pairs of said three generator outputs at the operating frequency, each such waveform being phase-displaced between 10°
-170°
with respect to the waveforms delivered across the respective other pairs of the three outputs,the electrosurgical instrument comprising at least three treatment electrodes, each treatment electrode being coupled to a respective one of the generator outputs for receiving RF power from the output stage of the generator, and the generator being constructed and arranged, such that the magnitude of the RF output voltage waveforms delivered to at least first and second pairs of said generator outputs being sufficient to allow simultaneous tissue cutting and coagulation at the respective treatment electrodes connected to the first and second pairs of said generator outputs when the system is used for tissue treatment. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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22. An electrosurgical generator for generating radio frequency (RF) power at a generator operating frequency, the generator comprising:
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a single source of RF power with a multiple-phase RF output stage having at least three outputs for coupling to respective electrodes of an electrosurgical instrument for delivering RF power to the electrodes, the configuration of the output stage being such that respective RF output voltage waveforms are simultaneously delivered across each pair of the said three outputs at the operating frequency, each such waveform being phase-displaced between 10°
-170°
with respect to the waveforms delivered across the respective other pairs of the three outputs, the RF output voltage waveforms delivered to at least first and second pairs of said three outputs allowing simultaneous tissue cutting and coagulation at respective electrodes connected to the first and second pairs of said three outputs, when the electrosurgical instrument is used for tissue treatment;the output stage comprising a multiple-phase output transformer which has windings forming at least three phases and a transformer core including at least one ferrite core member; and the transformer being constructed to provide at least three magnetic circuits, each magnetic circuit being inductively linked to the windings of at least two of the three phases. - View Dependent Claims (23, 24, 25)
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26. An electrosurgical generator for generating radio frequency (RF) power at a generator operating frequency, the generator comprising:
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a single source of RF power with a multiple-phase RF output stage having at least three outputs for coupling to respective electrodes of an electrosurgical instrument for delivering RF power to the electrodes, the configuration of the output stage being such that respective RF output voltage waveforms are simultaneously delivered across each pair of said three outputs at the operating frequency, each such waveform being phase-displaced between 10°
-170°
with respect to the waveforms delivered across the respective other pairs of the three outputs, the RF output voltage waveforms delivered to at least first and second pairs of said three outputs allowing simultaneous tissue cutting and coagulation at respective electrodes connected to the first and second pairs of said three outputs, when the electrosurgical instrument is used for tissue treatment,the output stage comprising;
a multiple-phase output transformer, each phase having a primary winding and a secondary winding, the phases being magnetically linked; and
a drive circuit coupled to the primary windings for feeding time-varying mutually phase-displaced drive currents to the primary windings, andthe transformer comprising a core which includes a monolithic ferrite core member having at least three limbs each carrying at least one winding, and an interconnecting bridge magnetically connecting the limbs, said three limbs being of substantially equal cross-section.
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27. An electrosurgical generator for generating radio frequency (RF) power at a generator operating frequency, the generator comprising:
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a single source of RF power with a multiple-phase RF output stage having at least three outputs for coupling to respective electrodes of an electrosurgical instrument for delivering RF power to the electrodes, the configuration of the output stage being such that continuous RF output voltage waveforms are simultaneously delivered across respective pairs of said three outputs at the operating frequency, each such waveform being phase-displaced between 10°
-170°
with respect to the waveforms delivered across the respective other pairs of the three outputs, the RF output voltage waveforms delivered to at least first and second pairs of said three outputs allowing simultaneous tissue cutting and coagulation at respective electrodes connected to the first and second pairs of said three outputs, when the electrosurgical instrument is used for tissue treatment,the output stage comprising;
a multiple-phase output transformer, each phase having a primary winding and a secondary winding, the phases being magnetically linked; and
a drive circuit coupled to the primary windings for feeding time-varying mutually phase-displaced drive currents to the primary windings, andthe transformer core comprising three independent magnetic circuits, each carrying the windings of two phases, the windings of each phase being wound around two of the three independent magnetic circuits.
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Specification