High-frequency generator for performing high-frequency surgery having adjustable power limitation, and method for controlling the power limitation
First Claim
1. High-frequency generator with adjustable limitation of the effective output power for HF surgical cutting of human or animal tissue, comprising:
- a device for finding the mean value of the effective output power of the HF generator,a comparison device for comparing the mean value thus found for the effective output power with a specified maximal mean value of the effective output power of the HF generator,a modulation device for modulating the output voltage of the HF generator with a modulation signal comprising pulses, such that a control device for controlling the modulation device alters the duration of the pulses in the modulation signal and/or the duration of the intervals between the pulses, in order to keep constant the peak value of the output voltage or the intensity of an arc that is formed between an electrode connected to the HF generator and the tissue, whenever the mean value found for the effective output power is greater than the maximal mean value of the effective output power.
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Accused Products
Abstract
The invention relates to an HF generator and to a method for limiting the output effective power of the HF generator, especially for performing HF surgical cutting and coagulation of human or animal tissue. According to the invention, the output voltage and the HF output current of the HF generator are detected by at least two detector devices, the peak values and the effective values of the HF output voltage and of the output current as well as the mean value of the output effective power of the HF generator are determined by an evaluation device, and the calculated mean value is compared to a defined maximum mean value of the output effective power of the HF generator by a comparison device. Afterwards, a modulation device modulates the HF output voltage using a pulse-shaped modulation signal. A control device controls the modulation device in such a manner that the pulse duration of the pulse-shaped modulation signal and/or the pulse duration between the pulse-shaped modulation signals is modified in order to keep the peak value of the output voltage constant when the calculated mean value of the output effective power is greater than the maximum mean value of the output effective power. Alternatively, the HF generator is equipped with a sensor for evaluating the intensity of electric arcs between an electrode connected to the HF generator and the tissue.
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Citations
22 Claims
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1. High-frequency generator with adjustable limitation of the effective output power for HF surgical cutting of human or animal tissue, comprising:
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a device for finding the mean value of the effective output power of the HF generator, a comparison device for comparing the mean value thus found for the effective output power with a specified maximal mean value of the effective output power of the HF generator, a modulation device for modulating the output voltage of the HF generator with a modulation signal comprising pulses, such that a control device for controlling the modulation device alters the duration of the pulses in the modulation signal and/or the duration of the intervals between the pulses, in order to keep constant the peak value of the output voltage or the intensity of an arc that is formed between an electrode connected to the HF generator and the tissue, whenever the mean value found for the effective output power is greater than the maximal mean value of the effective output power. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. Method for limiting the effective output power of a high-frequency (HF) generator for HF surgical cutting and coagulation of human or animal tissue, comprising:
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finding the mean value of the effective output power of the HF generator by means of a specially designed device, comparing the mean value found for the effective output power with a specified maximal mean value of the effective output power of the HF generator by means of a comparison device, modulating the output voltage of the HF generator with a modulation signal comprising pulses, by means of a modulation device, and controlling the modulation device—
by means of a control device in such a way that the duration of the pulses in the modulation signal and/or the duration of the intervals between the pulses are/is altered in order to keep constant the peak value of the output voltage and hence the intensity of an arc that is formed between an electrode connected to the HF generator and the tissue, whenever the mean value found for the effective output power is greater than the maximal mean value of the effective output power. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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Specification