A - Human Necessities – 61 – B
Patent
A - Human Necessities
61
B
331/19, 317/3, 3
A61B 17/22 (2006.01) A61N 1/06 (2006.01)
Patent
CA 1039815
ABSTRACT OF THE DISCLOSURE This invention relates to an instruments for disintegrat- ing calculi in the urinary tract by hydraulic impacts formed by electrical discharges in the liquid medium surrounding the calculi. Instruments employing this general principle are well known and they usually consist of a lithothrite having tow electrodes, and a pulse forming network connected to the electrodes to provide electrical energy for forming discharge between the lithotrite electrodes. In the lines connecting the pulse forming network to the lithotrites, the prior art instruments include spark gaps. These gaps have the disadvantages of being temperature and humidity dependent and of providing a great deal of service and maintenance problems. In accordance with the invention the spark gaps are replaced by solid state switch devices such as thyristors. The switching devices are controlled by a solid state pulse generator, and the repetition rate and intensity of the electrical discharges can be varied by varying the repetition rate and pulse duration of the pulse generator.
218416
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