F Wondrazek

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Experiments on the endoscopic destruction of kidney stones by neodymium-YAG laser, either thermically or mechanically, are being carried out with various results. The thermal destruction is clinically not feasible, and the risk of damaging neighboring tissue is inevitable. The direct generation of shock waves with pulsed Q-switch systems seems to represent(More)
An in vitro study was performed to test the ablative potential of a fiber-transmitted pulsed holmium laser (2.1 microns) applied to normal vascular wall, lipomatous plaques, and calcified plaques. Different fluences per pulse of 42, 80, 205, and 315 J/cm2 were used. Ablation of normal tissue and lipomatous plaques was achieved with all power settings.(More)
For laser-induced shockwave lithotripsy, the electromagnetic energy of a laser light pulse is converted intracorporeally into the acoustic energy of a shockwave. The lithotriptor is based on a specially developed, Q-switched Nd:YAG laser whose high power light pulses (70 mJ, 25 nsec) are coupled into a flexible quartz fiber with a core diameter of 600 mum.(More)
The problem of suitable energy transfer and conversion for intraureteral lithotripsy has not yet been solved satisfactorily. Laser-induced shockwave lithotripsy (LISL) appears to be a very promising solution to this problem. We report on initial clinical experience using a Q-switched Nd:YAG laser generating a shockwave on the metallic surface of an(More)
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