A frequency modulated ultrasonic therapeutic apparatus for bone fractures and a method for generating frequency modulated ultrasonic waves are revealed. The frequency modulated ultrasonic therapeutic apparatus includes a control interface, a control unit, a waveform generator circuit and a transducer. The control interface is used to set a plurality of parameters. The control unit coupled to the control interface generates a control signal according to those parameters. The waveform generator circuit is coupled to the control unit and is generating a waveform signal according to the control signal. The transducer converts the waveform signal and produces an ultrasonic wave. The present invention provides different parameters for modulating a frequency of ultrasonic waves. Ultrasonic waves with different frequencies are used to treat bone fractures during the bone healing process of living animals. Thus the fracture healing is speeded up and the recovery time is reduced.本發明係有關於一種用於促進骨折癒合之變頻超音波刺激,其設備包含一控制介面、一控制單元、一波形產生電路與一換能器,控制介面設定複數參數,控制單元耦接控制介面,並依據該些參數產生一控制訊號,波形產生電路耦接控制單元,依據控制訊號產生一波形訊號,換能器轉換波形訊號以產生一超音波,本發明在活體之骨折復原過程,提供不同參數,以依據不同參數而調整超音波之一頻率,用於在活體之骨折復原過程使用不同頻率之超音波治療該骨折。如此,可加速骨折之癒合速度與縮短復原時間。11‧‧‧控制介面13‧‧‧控制單元15‧‧‧顯示單元16‧‧‧波形產生電路161‧‧‧第一振盪器163‧‧‧第二振盪器165‧‧‧調節器167‧‧‧放大器19‧‧‧換能器
