Abstract
Abstract Quantification of calculus fragmentation by Er:YAG laser light was experimentally discussed. Er:YAG laser light was delivered to reach a calculus or a model calculus underwater by using a sealed hollow optical fiber. Fragmentation efficiency was obtained for alumina ball used as a model of calculus when sealing caps with various focusing effect were used. Three types of human calculi were analyzed and their absorption properties at the wavelength of Er:YAG laser light were obtained. The relationship among the absorption property, constituents of calculus, and the fragmentation efficiency were also discussed. 1. Introduction In medical laser application for calculus fragmentation, a Ho:YAG laser that radiates at the wavelength of 2.1 µ m has been used as the energy source [1]. The Ho:YAG laser light can be delivered into the ureter by using a flexible silica fiber under the observation of an endoscope. Recently, it was reported [2, 3] that Er:YAG laser light with a wavelength of 2.94 µ m is appropriate for the application of calculus fragmentation, since it is more strongly absorbed in all types of calculi. However, a relatively
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