Surgery – Truss – Pad
Patent
1991-05-30
1993-06-01
Smith, Ruth S.
Surgery
Truss
Pad
128 24EL, A61B 1722
Patent
active
052150917
ABSTRACT:
A lithotrity apparatus of this invention sends a low-pressure wave into a body continuously, at an interval shorter than an irradiating interval predetermined as an irradiating rate of an impulse from an impulse source. The low-pressure wave serves to discriminate coincidence and non-coincidence of a position of a focal point and that of a stone. When the intensity of the impulse received by a piezocrystal is at a predetermined threshold or higher, it is determined that the focal point coincides with the stone, and an impulse is radiated. Radiation of the impulse and a low-pressure wave is stopped during a time period corresponding to the predetermined radiation interval starting from the moment of impulse radiation. More specifically, the apparatus uses a piezocrystal as the impulse source. The piezocrystal is driven by a pulse generator and and a low-power supply when a low-pressure wave of a interval shorter than the predetermined irradiating interval is generated. The echo of the low-pressure wave is received. When a comparing circuit determines that the echo intensity is a threshold or more, the piezocrystal is switched to a high-power supply and is driven by a high-power pulse, thereby radiating an impulse. At this time, driving of the piezocrystal by the high-power source is kept stopped by an echo rate counter for a time interval corresponding to a predetermined irradiating interval, that is, until a subsequent cycle. Also, the pulse generator is stopped to sending a low-pressure wave by a switching operation of a switch. The apparatus operates in the above manner and is practiced by the above constituent elements.
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Kabushiki Kaisha Toshiba
Smith Ruth S.
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