Surgery – Truss – Pad
Patent
1977-10-19
1980-03-04
Michell, Robert W.
Surgery
Truss
Pad
128421, A61B 1700
Patent
active
041911890
ABSTRACT:
An instrument for disintegrating calculi in the urinary tract by hydraulic impacts formed by electrical discharges in the liquid medium surrounding the calculi wherein the electrical discharges are provided by a spark discharge circuit employing a high voltage, vacuum type or gas filled relay controlled by a pulse generator. Capacitors charge lithotrites to form the electrical discharge. The capacitors are discharged through circuits employing the high voltage relay. Specifically, the relay switches the lithotriptor electrodes directly across a charged capacitor thereby producing a spark discharge across the electrodes. The spark discharge repetition rate and its intensity are controlled by circuit parameters.
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patent: 3699389 (1972-10-01), Holsinger
patent: 3794841 (1974-02-01), Cosentino et al.
patent: 3902499 (1975-09-01), Shene
patent: 4027674 (1977-06-01), Tessler et al.
patent: 4123673 (1978-10-01), Gonser
Basic Electronics for Engineers & Scientists, by Russell E. Lueg and Erwin A. Reinhard, Intext Educational Pub., 1972.
Michell Robert W.
Shedd C. W.
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