Triggering circuit

Details Triggering circuit Triggering circuit

1986-09-29

1987-09-15

Recla, Henry J.

Surgery

Truss

Pad

A61B 1700

Patent

active

046932470

ABSTRACT:
Apparatus is provided for the extracorporeal disintegration of kidney stones and the like. An ellipsoidal reflector has a spark gap positioned at one focus point of the ellipsoid, and the reflector is positioned so that the kidney stone being disintegrated is at the second focus point. The reflector is filled with water so that when a spark is generated through the spark gap, a shock wave is generated through which is focused through the water and through body tissues on the kidney stone. Both an electrocardiogram apparatus and an ultrasound pick-up apparatus are coupled to a spark triggering circuit controlling the pulse generator so that a spark or pulse can be generated only during ventricular contraction, thereby avoiding any possibility of inducing fibrillation of the heart.

REFERENCES:
patent: 4595019 (1986-06-01), Shene et al.
patent: 4620545 (1986-11-01), Shene et al.

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