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Destruction of urinary calculi using laser beams. Experimental principles and in vitro studies

Destruction of urinary calculi using laser beams. Experimental principles and in vitro studies

Der Urologe. Ausg. a 23(3): 181-184

Despite recent therapeutic advances, urinary stone disease is still a main problem in urology. We investigated lithotrypsy of urinary calculi by the use of a Neodymium-YAG-laser. Application of laser power up to 88 W with a continuous wave laser and with a high power pulsed laser (220 microseconds/24,5 mJ to 10 ms/20 J) only lead to melting or burning of the stones. Irradiation with a Q-switched laser (12 ns/13,6 mJ) beam resulted in a burst of stone parts without complete fragmentation of the calculus, whereas the use of a Q-switched laser (12 ns/13,6 mJ) with an optomechanical coupler generated stress waves, which disintegrated stones into small parts. All experiments have been carried out in vitro. A possible technical application of the methods in vivo is discussed.

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Accession: 042765238

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PMID: 6539994

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