Electrosurgical medical system and method
First Claim
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1. A method for controlling an electrosurgical tissue cutting electrode of a medical device comprising:
- providing the electrosurgical tissue cutting electrode having an arcuate electrode portion;
delivering energy from an RF generator to the electrosurgical tissue cutting electrode, the radiofrequency (RF) generator including an RF amplifier;
monitoring an electrical characteristic associated with the electrosurgical tissue cutting electrode; and
establishing a desired RF power output and a desired RF duty cycle at the RF generator by adjusting DC input voltage applied to an output stage of the RF amplifier based on the monitoring to effect tissue cutting by the arcuate electrode portion.
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Abstract
A method for controlling an electrosurgical electrode of a medical device includes providing an electrosurgical tissue cutting electrode having an arcuate electrode portion; delivering energy from an RF generator to the electrosurgical electrode, said RF generator including an RF amplifier; monitoring an electrical characteristic associated with said electrosurgical electrode; and establishing a desired RF power output and a desired RF duty cycle at said RF generator by adjusting DC input voltage applied to an output stage of said RF amplifier based on said monitoring to effect tissue cutting by the arcuate electrode portion.
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Citations
19 Claims
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1. A method for controlling an electrosurgical tissue cutting electrode of a medical device comprising:
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providing the electrosurgical tissue cutting electrode having an arcuate electrode portion; delivering energy from an RF generator to the electrosurgical tissue cutting electrode, the radiofrequency (RF) generator including an RF amplifier; monitoring an electrical characteristic associated with the electrosurgical tissue cutting electrode; and establishing a desired RF power output and a desired RF duty cycle at the RF generator by adjusting DC input voltage applied to an output stage of the RF amplifier based on the monitoring to effect tissue cutting by the arcuate electrode portion. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method for controlling an electrosurgical tissue cutting electrode of a medical device comprising:
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delivering energy from an RF generator to the electrosurgical tissue cutting electrode, the electrosurgical tissue cutting electrode having a length including an arcuate electrode portion to establish an arcuate electrode contact area with tissue to cut the tissue in an arcuate path; determining when the electrosurgical tissue cutting electrode has started cutting the tissue; and switching the energy from a start mode that provides a first RF power output and a first RF duty cycle, to a run mode having a second RF duty cycle and a second RF power output lower than the first RF power output and controlled by a control servo system, responsive to the determining. - View Dependent Claims (10, 11, 12, 13)
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14. A method for controlling an electrosurgical tissue cutting electrode, comprising:
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a. providing an RF generator to generate an RF signal having RF energy, the RF generator having a start mode with a first RF duty cycle and a first RF power output and a cutting mode with a second RF duty cycle and a second RF power output lower than the first RF power output; b. delivering the RF energy from the RF generator operating in the start mode to an electrosurgical tissue cutting electrode having an arcuate electrode portion; c. filtering the RF signal, which represents the RF energy delivered to the electrosurgical tissue cutting electrode, to provide a DC voltage; d. monitoring the DC voltage; e. switching the RF generator from the start mode to the cutting mode when the monitored DC voltage is detected to be at a level to form plasma on the electrosurgical tissue cutting electrode; f. delivering the RF energy to the electrosurgical tissue cutting electrode with the RF generator in the cutting mode; and g. moving the electrosurgical tissue cutting electrode to cut the tissue when the RF generator is in the cutting mode. - View Dependent Claims (15, 16, 17, 18, 19)
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Specification