Isolation of gas in hydraulic spark gap shock wave generator

Details Isolation of gas in hydraulic spark gap shock wave generator Isolation of gas in hydraulic spark gap shock wave generator

1986-11-07

1987-12-29

Thaler, Michael H.

Surgery

Truss

Pad

367147, 128 24A, A61B 1722

Patent

active

047153768

ABSTRACT:
Apparatus for generating shock waves for destruction of kidney stones comprises an upwardly opening ellipsoidal reflector. A resilient diaphragm closes the otherwise open end of the reflector, and the reflector is filled with water or other suitable liquid. A spark gap is provided in the reflector at the first focus point thereof, and the reflector is positioned relative to a human body such that the diaphragm presses against the body and the second focus point of the ellipsoid lies precisely on a kidney stone to be destroyed. Electronic apparatus is provided for causing a repeating spark across the gap to generate a series of shock waves which are focused by the ellipsoidal reflector to concentrate on a kidney stone. Gas is released by the sparks, and either a small tube surrounds the spark gap, or a diaphragm immediately overlies the spark gap to isolate water adjacent the spark gap from most of the water in the reflector. The isolated water is constantly recirculated to flush away gas.

REFERENCES:
patent: 3970076 (1976-07-01), Hepp et al.
patent: 4630607 (1986-12-01), Duinker et al.

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