Patent ID: 7744593
Filing Date: 2010-06-29
Classification: A61B

Abstract:
1. A high-frequency power supply device comprising: a high-frequency power generation unit for outputting a high-frequency voltage and supplying, via a treatment tool for performing a treatment on a biological tissue, a high-frequency current based on the high-frequency voltage to the biological tissue; a phase detection unit for detecting respective phases of the high-frequency voltage and the high-frequency current outputted from the high-frequency power generation unit; an impedance calculation unit for calculating the impedance of the biological tissue on the basis of the voltage magnitude of the high-frequency voltage outputted from the high-frequency power generation unit and the current magnitude of the high-frequency current outputted from the high-frequency power generation unit; a phase difference calculation unit for calculating the phase difference between the high-frequency voltage and the high-frequency current outputted from the high-frequency power generation unit on the basis of the respective phases detected by the phase detection unit; and a control unit for performing a control on the high-frequency power generation unit to output a high-frequency voltage and a high-frequency current having a predetermined waveform on the basis of at least one of the impedance and the phase difference and the output state of an instruction signal outputted from an operation instruction unit which can output the instruction signal for causing the high-frequency power supply device to supply the biological tissue with the high-frequency current, wherein immediately after the output of the instruction signal, the control unit further performs a first control on the high-frequency power generation unit to output a high-frequency voltage and a high-frequency current having a first waveform, and when the instruction signal continues to be outputted, and upon detection that the phase difference has increased from 0°, the control unit further performs, subsequent to the first control, a second control on the high-frequency power generation unit to output a high-frequency voltage and a high-frequency current having a second waveform with a lower crest factor than that of the first waveform.