Patent ID: 7546781
Filing Date: 2009-06-16
Classification: A61B

Abstract:
1. An ultrasonic operation apparatus, comprising: a hand piece accommodating an ultrasonic transducer for generating ultrasonic vibrations; a probe which is removably connected to said hand piece and to which the ultrasonic vibrations are conveyed, the probe being connectable to and disconnectable from the hand piece; a drive signal generating unit for generating a first drive signal that drives the ultrasonic transducer, and a second drive signal, an output level of the second drive signal being different from an output level of the first drive signal, and the drive signal generating unit being operable for outputting the first and second drive signals to the ultrasonic transducer; an output detecting unit for detecting an output current and an output voltage of the second drive signal to the ultrasonic transducer; and a controlling unit which controls operations of said drive signal generating unit based on a phase difference between the output voltage and the output current of the second drive signal for making a judgment on a running state of said probe or said hand piece by determining whether or not a second resonance frequency can be detected within a predetermined range, the second resonance frequency being a frequency at which the phase difference between the output voltage and the output current of the second drive signal becomes almost zero, wherein the controlling unit detects whether the probe and the hand piece are connected and makes the judgment when detecting that the probe and the hand piece are connected.