Method for the operation of a high frequency ablation apparatus and apparatus for the high frequency tissue ablation
First Claim
1. Method of operating a radiofrequency ablation instrument comprising a radiofrequency energy source having a plurality of regulatable outputs, with a plurality of electrodes being connectable to its outputs, at least one regulatable DC voltage source and at least one switching stare connected to the DC voltage source, the method comprising controlling for the generation of the radiofrequency output voltage, at the or each switching stage by a periodic switching signal, and regulating the voltage transmitted from the DC voltage source for the regulation of the voltage delivered by the radiofrequency energy source, detecting for each output a respective power value and/or current value representative of the power and/or the current transmitted by the radiofrequency energy source;
- regulating a voltage transmitted from the radiofrequency energy source in dependence on the detected power value and/or current value such that the latter corresponds substantially to a predetermined power value and/or current value; and
maintaining a predetermined phase relationship in each case between the currents or between the voltages at the outputs of the radiofrequency energy source.
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Accused Products
Abstract
A method is described for the operation of a radiofrequency ablation instrument comprising a radiofrequency energy source having a plurality of regulatable outputs, with a plurality of electrodes being connectable to its outputs. A respective power value and/or current value representative of the power and/or the current transmitted by the radiofrequency energy source is detected for each output. The voltage delivered from the radiofrequency energy source is regulated in dependence on the detected power value and/or current value in such a way that the latter corresponds substantially to a predetermined power value and/or current value. A predetermined phrase relationship is in each case maintained between the currents or between the voltages at the outputs of the radiofrequency energy source. Furthermore, a corresponding apparatus is described.
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Citations
22 Claims
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1. Method of operating a radiofrequency ablation instrument comprising a radiofrequency energy source having a plurality of regulatable outputs, with a plurality of electrodes being connectable to its outputs, at least one regulatable DC voltage source and at least one switching stare connected to the DC voltage source, the method comprising controlling for the generation of the radiofrequency output voltage, at the or each switching stage by a periodic switching signal, and regulating the voltage transmitted from the DC voltage source for the regulation of the voltage delivered by the radiofrequency energy source, detecting for each output a respective power value and/or current value representative of the power and/or the current transmitted by the radiofrequency energy source;
regulating a voltage transmitted from the radiofrequency energy source in dependence on the detected power value and/or current value such that the latter corresponds substantially to a predetermined power value and/or current value; and
maintaining a predetermined phase relationship in each case between the currents or between the voltages at the outputs of the radiofrequency energy source.- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
- 11. Apparatus for the high frequency ablation of tissue comprising a radiofrequency energy source having a plurality of regulatable outputs, with a plurality of electrodes being connectable to its outputs, at least one regulatable DC voltage source, at least one switching stage connected to the DC voltage source and a cycle generator which transmits a periodic switching signal, for controlling the switching stage, at least one measurement element for detecting power values and/or current values representative of the power and/or current delivered at the respective outputs, at least one regulating element connected to the measurement element for the regulation of the voltage delivered by the radiofrequency energy source in dependence on the detected power value and/or current value applied to an actual value input of the regulating element, and on a preset power value and/or current value applied to a desired value input of the regulating element, and a phase controller for maintaining a predetermined phase relationship in each case between the currents or between the voltages at the outputs of the radiofrequency energy source.
Specification