PROBLEM TO BE SOLVED: To continue exhibiting a high treatment ability by stably operating an ultrasonic vibrator despite the variations of resonance frequencies of the ultrasonic vibrator caused by loads to the ultrasonic vibrator.SOLUTION: There is provided an ultrasonic treatment apparatus 1, which comprises: an ultrasonic vibrator 4, a power supply unit 71 for outputting high-frequency drive power a transformer 73 which includes a primary winding connected to the power supply unit 71 and a secondary winding connected to the ultrasonic vibrator 4, and which supplies the drive power input from the power supply unit 71 to the primary winding to the ultrasonic vibrator 4 via the secondary winding a frequency detection unit 6 for detecting the frequency at which the impedance of the ultrasonic vibrator 4 is minimized in a predetermined frequency range including the no-load resonance frequency of the ultrasonic vibrator 4 and a control unit 83 for controlling the power supply unit 71 such that the frequency of the drive power matches the frequency detected by the frequency detection unit 6. In the ultrasonic treatment apparatus 1, the frequency detection unit 6 is connected to the ultrasonic vibrator 4 on the secondary winding side of the transformer 73.COPYRIGHT: (C)2015,JPO&INPIT【課題】超音波振動子への負荷による超音波振動子の共振周波数の変化にかかわらず、超音波振動子を安定的に発振させて高い処置能力を発揮し続ける。【解決手段】超音波振動子4と、高周波の駆動電力を出力する電力供給部71と、電力供給部71に接続された1次巻線と超音波振動子4に接続された2次巻線とを有し、電力供給部71から1次巻線に入力された駆動電力を2次巻線を介して超音波振動子4に供給するトランス73と、超音波振動子4の無負荷時の共振周波数を含む所定の周波数範囲において超音波振動子4のインピーダンスが最小となる周波数を検出する周波数検出部6と、駆動電力の周波数を周波数検出部6によって検出された周波数に一致させるように電力供給部71を制御する制御部83とを備え、周波数検出部6が、トランス73の2次巻線側において超音波振動子4に接続されている超音波治療装置1を提供する。【選択図】図2
