Electrosurgical generator
First Claim
1. A system for tissue ablation that includes a radiofrequency generator, a radiofrequency ablation electrode, and a controller;
- wherein the radiofrequency generator is configured to deliver a radiofrequency signal via the radiofrequency ablation electrode;
wherein the controller automatically produces a sequence of on periods and off periods;
wherein during each on period, the controller configures the signal level to heat tissue in order to increase the volume ablated tissue and to produce boiling in the tissue;
wherein during each off period, the controller configures the signal level to allow for cooling of heated tissue;
wherein the controller terminates an on period based in part on a measured indication of boiling in the tissue;
wherein after the signal is first configured to heat tissue in order to increase the volume ablated tissue, the controller configures both increases and decreases of the signal level delivered during on periods based in part on the duration of a present on period or of a previous on period.
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Accused Products
Abstract
This invention relates to high-frequency ablation of tissue in the body using a cooled high-frequency electrode connected to a high frequency generator including a computer graphic control system and an automatic controller for control the signal output from the generator, and adapted to display on a real time graphic display a measured parameter related to the ablation process and visually monitor the variation of the parameter of the signal output that is controlled by the controller during the ablation process. In one example, one or more measured parameters are displayed simultaneously to visually interpret the relation of their variation and values. In one example, the displayed one or more parameters can be taken from the list of measured voltage, current, power, impedance, electrode temperature, and tissue temperature related to the ablation process. The graphic display gives the clinician an instantaneous and intuitive feeling for the dynamics and stability of the ablation process for safety and control. This invention relates to monitoring and controlling multiple ground pads to optimally carry return currents during high-frequency tissue ablation, and to prevent of ground-pad skin burns. This invention relates to the use of ultrasound imaging intraoperatively during a tissue ablation procedure. This invention relates to the use of nerve stimulation and blocking during a tissue ablation procedure.
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Citations
28 Claims
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1. A system for tissue ablation that includes a radiofrequency generator, a radiofrequency ablation electrode, and a controller;
- wherein the radiofrequency generator is configured to deliver a radiofrequency signal via the radiofrequency ablation electrode;
wherein the controller automatically produces a sequence of on periods and off periods;
wherein during each on period, the controller configures the signal level to heat tissue in order to increase the volume ablated tissue and to produce boiling in the tissue;
wherein during each off period, the controller configures the signal level to allow for cooling of heated tissue;
wherein the controller terminates an on period based in part on a measured indication of boiling in the tissue;
wherein after the signal is first configured to heat tissue in order to increase the volume ablated tissue, the controller configures both increases and decreases of the signal level delivered during on periods based in part on the duration of a present on period or of a previous on period. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28)
- wherein the radiofrequency generator is configured to deliver a radiofrequency signal via the radiofrequency ablation electrode;
Specification