Abstract: The fragmentation response of urinary and ureteral calculi via a single flexible UV quartz/quartz fiber with 320 $mu@m core diameter has been studied in-vitro using a Q- switched solid-sate alexandrite laser system running simultaneously at two wavelengths in the Blue (380 nm) and Near-IR (760 nm) spectral region with continuously adjustable pulse energy ratios of both laser radiations. It was found that the fragmentation quality - compared to a dye laser system with 1.2 $mu@sec pulse duration at 504 nm - is significantly better and faster, and strongly depends on the stone surface color, the acoustic impedance of the exterior/interior stone structure and the energy ratio of the Blue and Near-IR laser beams.!11
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