The present invention relates to a circulation conduits, wherein managing (1) crush zone (2,3) and slot (4). After through stone (8), circulation closure is to form a cage structure, with unusual quality, clamps (7,2) flat around stone (8) and the degree to the protection slided on stone is significantly increased in this way. Meanwhile mucus is removed by flat region (2) from a sizable surface area of stone (8), the mobility of the stone in ureter becomes more convenient. With the extractor of known cage type on the contrary, circulation according to the present invention, as its shape as a result, being inserted into and using a smaller injury danger to ureter.It removes stoneimage
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