Lithotrity apparatus having a missed-shot preventive function

Details Lithotrity apparatus having a missed-shot preventive function Lithotrity apparatus having a missed-shot preventive function

1991-05-30

1993-09-14

Smith, Ruth S.

Surgery

Truss

Pad

128 24EL, A61B 1722

Patent

active

052439852

ABSTRACT:
An electromagnetic induction type lithotrity apparatus, having a shock-wave source utilizing electromagnetic induction to generate a shock-wave, and focusing means to focus the shock-wave at a predetermined position, for focusing and irradiating the shock-wave toward a stone in the body of a patient which is located at the predetermined position, thereby pulverizing the stone. The apparatus comprising a drive section (sending section) 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, an echo receiving section, including a piezoelectric film arranged in front of the shock-wave source, for receiving a low-pressure echo reflected from the body, an echo detecting section for detecting the intensity of an echo, among the echoes received by the echo receiving section, reflected by a focal zone of the shock-wave, and a control section for comparing the intensity of the echo detected by the echo detecting section 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 to a high voltage sufficient for lithotrity, and generating a signal for driving the shock-wave source.

REFERENCES:
patent: 4634917 (1987-01-01), Dvorsky et al.
patent: 4771787 (1988-09-01), Wurster et al.
patent: 4803995 (1989-02-01), Ishida et al.
patent: 4986259 (1991-01-01), Aida et al.
patent: 5009232 (1991-04-01), Hassler et al.
patent: 5076277 (1991-12-01), Iwama et al.
patent: 5078143 (1992-01-01), Okazaki et al.

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