Patent ID: 7252648

Claim:
A ultrasound puncture system comprising: a handpiece which accommodates an ultrasound vibrator as ultrasound wave generating means; a puncturing probe having a pointed distal end portion that punctures a biological wall and penetrates through said biological wall by transmitting ultrasound waves to said biological wall which is to be punctured; an outer cover tube which covers the probe and is detachably attached to the handpiece, said outer cover tube having a distal end portion that punctures said biological wall as the handpiece punctures said biological wall, and penetrates through said biological wall as the handpiece penetrates trough said biological wall; an ultrasound power source unit for supplying energy for driving the ultrasound vibrator; termination means installed in the ultrasound power source unit for terminating the energy supply to the ultrasound vibrator; impedance detection means installed in the ultrasound power source unit for detecting the puncture state when the probe punctures the biological wall; electric current detection means for detecting the electric current component of the energy supplied to the ultrasound vibrator; voltage detection means for detecting the voltage component of the energy; operation means for deriving the impedance from the detection results of the electric current and voltage detection means; and decision means for deciding that the probe has penetrated the biological wall based on the results of the operation means.