| 摘要 |
<p>A surgical instrument includes a hand piece (4) including a probe (25) to be supplied with a high frequency current, a high frequency drive circuit (3) for supplying a high frequency current to the probe (4) and an ultrasonic transducer (12) rigidly secured to the probe (25) to provide an ultrasonic vibration. The ultrasonic transducer drive circuit (2) adjusts the current being supplied to the ultrasonic transducer (12) and controls the amplitude of oscillations of the ultrasonic transducer (12) according to the impedance value detected at the high frequency drive circuit (3).</p> |
