The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 15, 1992
Filed:
Oct. 16, 1990
Harald Eizenhoefer, Johannesberg, DE;
Dornier Medizin Technik, , DE;
Abstract
An arrangement for the comminution of concrements of various kinds in the body of living being, uses an underwater or submerged arc gap with spark discharge, and an electrical energizing circuitry for that arc gap, a plurality of electrode assemblies from which one is selected to be used in the equipment is connected to the energizing circuit; the electrode assemblies are basically similarly configured and each has an ohmic resistor which is connected directly in series with one of the electrodes, the resistance value for the resistors in the electrode assemblies of the plurality are different, and in each instance much lower than the resistance of the unignited gap, but of comparable magnitude with the resistance of a fully developed plasma channel in the gap following ignition by the energizing circuit.