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Laser induced shock wave ureteral lithotripsy using q switched neodymium yag laser



Laser induced shock wave ureteral lithotripsy using q switched neodymium yag laser



Journal of Endourology 4(2): 169-174



Laser-induced shock wave generation with a high-intensity Q-switched Nd:YAG laser depends on a laser-induced breakdown in a liquid with formation of an oscillating plasma bubble and cavitational effects. No thermal lesions in porcine urothelium so treated could be found. A new multifunctional laser for shock wave creation (20-nsec pulse duration) for urinary calculi and a free-running mode with millisecond pulses for biliary stones and coagulation of tissue has been developed for use with 320-, 400-, and 600-.mu.m quartz fibers. In 118 patients with 120 calculi treated with laser-induced shock wave lithotripsy (LISL), complete fragmentation of 114 stones was obtained. In the remaining six calculi, laser distintegration was too slow. The slow. The efficacy of LISL can be augmented with highly dilute metallic solutions (iron-III dextran or magnesium chloride) by a self-focusing effect on the laser beam. With small (320-400 .mu.m) quartz fibers, however, these solutions are not necessary for destruction of hard stones, as the laser focus is minimized.

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Accession: 007506129

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