High frequency power source
First Claim
1. A method for controlling electrosurgical tissue cutting at a patient'"'"'s site, comprising:
- a. providing an electrosurgical cutting tool having a tissue cutting electrode with a distal tip and an exposed conductive length proximal to the distal tip that is configured to contact tissue;
b. providing a return electrode in contact with the patient'"'"'s tissue remote from the patient'"'"'s site;
c. providing an electrosurgical RF power generator in an electrical conductive relationship with the tissue cutting electrode and the return electrode;
d. contacting tissue with the exposed conductive length of the tissue cutting electrode;
e. generating RF energy as a waveform within the electrosurgical RF power generator and gating the RF energy to generate gated RF energy having a duty cycle of less than 100%;
f. delivering the gated RF energy from the electrosurgical RF power generator to the tissue cutting electrode so as to pass an electrical current from the exposed conductive length of the tissue cutting electrode to tissue in contact with the exposed conductive length of the tissue cutting electrode to form a steam layer between the tissue cutting electrode and the tissue by tissue desiccation and generate a conductive plasma along the exposed conductive length, and with the onset of the steam layer continued desiccation and cutting of the tissue is effected; and
g. regulating the electrosurgical RF power generator to maintain a voltage present at the tissue cutting electrode above a level needed to maintain formation of the steam layer by adjusting a gain of a voltage controlled amplifier in the electrosurgical RF power generator based at least in part on a voltage present at the electrosurgical cutting tool as well as a DC potential generated across a tool/tissue boundary of the electrosurgical cutting tool and the tissue.
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Accused Products
Abstract
A high frequency electrosurgical power generator configured to produce electrical power at a frequency of about 1 to about 14 MHz and preferably having an essentially sinusoidal waveform with a voltage level up to 1,000 Vrms, and a current level up to 5 Amps. The output of the high frequency electrosurgical power generator is connected to an electrosurgical tool configured to receive the voltage and current produced by the electrosurgical power generator and deliver the voltage and current to an electrosurgical site. The output of the electrosurgical generator preferably is an essentially sinusoid waveform with a frequency between about 3 MHz and about 8 MHz, up to about 700 volts rms, up to about 2 amps, with a total power of up to 1,000 watts.
62 Citations
7 Claims
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1. A method for controlling electrosurgical tissue cutting at a patient'"'"'s site, comprising:
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a. providing an electrosurgical cutting tool having a tissue cutting electrode with a distal tip and an exposed conductive length proximal to the distal tip that is configured to contact tissue; b. providing a return electrode in contact with the patient'"'"'s tissue remote from the patient'"'"'s site; c. providing an electrosurgical RF power generator in an electrical conductive relationship with the tissue cutting electrode and the return electrode; d. contacting tissue with the exposed conductive length of the tissue cutting electrode; e. generating RF energy as a waveform within the electrosurgical RF power generator and gating the RF energy to generate gated RF energy having a duty cycle of less than 100%; f. delivering the gated RF energy from the electrosurgical RF power generator to the tissue cutting electrode so as to pass an electrical current from the exposed conductive length of the tissue cutting electrode to tissue in contact with the exposed conductive length of the tissue cutting electrode to form a steam layer between the tissue cutting electrode and the tissue by tissue desiccation and generate a conductive plasma along the exposed conductive length, and with the onset of the steam layer continued desiccation and cutting of the tissue is effected; and g. regulating the electrosurgical RF power generator to maintain a voltage present at the tissue cutting electrode above a level needed to maintain formation of the steam layer by adjusting a gain of a voltage controlled amplifier in the electrosurgical RF power generator based at least in part on a voltage present at the electrosurgical cutting tool as well as a DC potential generated across a tool/tissue boundary of the electrosurgical cutting tool and the tissue. - View Dependent Claims (2, 3, 4, 5)
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6. A method for controlling an electrosurgical RF power generator for performing electrosurgical tissue cutting at a patient'"'"'s site, comprising:
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a. directly contacting tissue at the patient'"'"'s site with an exposed conductive length of a tissue cutting electrode while a return electrode is in contact with the patient'"'"'s tissue at a location that is remote from the patient'"'"'s site, each of the tissue cutting electrode and the return electrode being in electrical communication with the electrosurgical RF power generator; b. generating RF energy as a waveform within the electrosurgical RF power generator and gating the RF energy to generate gated RF energy; c. delivering the gated RF energy from the electrosurgical RF power generator to the tissue cutting electrode so as to pass an electrical current from the exposed conductive length of the tissue cutting electrode to tissue in contact with the exposed conductive length of the tissue cutting electrode to form a steam layer between the tissue cutting electrode and the tissue by tissue desiccation and generate a conductive plasma along the exposed conductive length, and with the onset of the steam layer continued desiccation and cutting of the tissue is effected; and d. regulating the electrosurgical RF power generator to maintain formation of the steam layer by adjusting a gain of a voltage controlled amplifier in the electrosurgical RF power generator based at least in part on a DC potential generated across a tool/tissue boundary of the electrosurgical cutting tool and the tissue at the patient'"'"'s site.
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7. A method for controlling an electrosurgical RF power generator for performing electrosurgical tissue cutting at a surgical site on a patient, comprising:
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a. contacting tissue at the surgical site with an exposed conductive length of a tissue cutting electrode while a return electrode is in contact with the patient'"'"'s tissue at a location that is remote from the surgical site, each of the tissue cutting electrode and the return electrode being in electrical communication with the electrosurgical RF power generator; b. generating RF energy as a waveform within the electrosurgical RF power generator and gating the RF energy to generate gated RF energy; c. delivering the gated RF energy from the electrosurgical RF power generator to the tissue cutting electrode so as to pass an electrical current from the exposed conductive length of the tissue cutting electrode to tissue in contact with the exposed conductive length of the tissue cutting electrode to form a steam layer between the tissue cutting electrode and the tissue by tissue desiccation and generate a conductive plasma along the exposed conductive length, and with the onset of the steam layer continued desiccation and cutting of the tissue is effected; and d. regulating the electrosurgical RF power generator to maintain formation of the steam layer by adjusting a gain of a voltage controlled amplifier in the electrosurgical RF power generator based at least in part on a DC potential generated across a tool/tissue boundary of the electrosurgical cutting tool and the tissue at the patient'"'"'s site.
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Specification