Patent ID: 8206382

Claim:
A surgical apparatus comprising: a surgical instrument configured to treat a diseased part of a patient; an energy supply unit configured to supply energy, having a waveform configured to turn on and off, for driving the surgical instrument; a sensor configured to obtain information about states of the surgical instrument; an energy change detector configured to detect rising and falling of the waveform of the energy supplied to the surgical instrument as an energy change point; and a control unit configured to control the sensor to drive at positions other than the energy change point detected by the energy change detector, wherein positions other than the energy change point are ON or OFF periods of the energy, the control unit comprising: a frequency change unit configured to change the frequency of the waveform of the energy; a duty ratio change unit configured to change a duty ratio of the waveform of the energy; and a drive timing control unit which drives the sensor in either an ON or OFF period of a wave having the frequency changed by the frequency change unit and either an ON or OFF period of a wave having the duty ratio changed by the duty ratio change unit.