Importance

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Abstract

An invasive lithotripter includes a pair of electrodes having rectangular cross sections, and having flat faces of rectangular configuration confronting one another. An insulating member is interposed between the electrodes and spaces them apart a predetermined distance. The insulating member at its forward edge is relieved to provide portions of the electrode flat faces exposed and confronting one another to permit an electrical spark to jump between the exposed portions of the electrode faces. The relieved portion comprises a reflector having a focus point. The portions of the electrodes facing one another across the relieved area are provided with protuberances aligned with the focus point. A spark across the exposed portions of the faces of the electrodes in an aqueous medium generates a shockwave that is focused by the reflector. A shield surrounds and extends beyond the electrode and the insulating member to inhibit radial propagation of shockwave energy while enhancing axial propagation thereof.

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First Claim