| 摘要 |
<p>An electromagnetic induction type lithotrity apparatus, having a shock-wave source (10) utilizing electromagnetic induction to generate a shock-wave, and focusing means (20) to focus the shock-wave at a predetermined position (F2), for focusing and irradiating the shock-wave toward a stone (28) in the body of a patient (26) which is located at the predetermined position (F2), thereby pulverizing the stone, comprising, drive section (sending section) (1) for driving the shock-wave source by a voltage lower than that for generating the shock-wave so as to send a low-pressure wave lower in pressure than the shock-wave to the inside of the body, echo receiving section (2), including a piezoelectric film (15) arranged in front of the shock-wave source, for receiving a low-pressure echo reflected from the body, echo detecting section (3) for detecting the intensity of an echo, among the echoes received by the echo receiving section (2), reflected by a focal zone of the shock-wave, and control section (4) for comparing the intensity of the echo detected by the echo detecting section (3) with a predetermined value, sending a predetermined signal to the drive section (sending section) based on the comparison result, switching the drive voltage of the shock-wave source (10) to a high voltage sufficient for lithotrity, and generating a signal for driving the shock-wave source (10). <IMAGE></p> |
