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200 in vitro shots were performed with an EDAP LT 01 system in order to test the sensitivity of the various urinary stones to lithotrity and to study the action of the various shot parameters. All calculi do not have an equally favorable reaction to lithotrity. The deciding factor is neither their hardness, nor their chemical composition, nor their crystallizing shape, but rather the architecture ruling the arrangement of the crystallins forms in the calculus. The most important shot parameter is the power of the system, which conditions its efficiency. However, the shooting method, and more specifically the setting of the shot rate, allows adjusting the shots according to the desired results. The lithotriters will only be improved, ie. made more effective and less traumatic, if these experiments are continued.
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