Figure 1: Special basic instruments set of the UMP. (a) Working metal sheath and its obturator. (b) Spatial location of the fine tube, obturator, guide wire and laser fiber, and water jet out from inner fine tube. (c) Mininephroscope assembled with a 3.5 Fr telescope and a 6 Fr demountable telescope (inner) sheath. The 3.5 Fr telescope passes through the central channel. Irrigation connection and laser fiber are each attached to one side port. Optics is connected to a zoom ocular and light adapter. (d) Water jet flush out some larger stone debris (<3 mm) and blood clots through the working sheath after rapid removal of the endoscope.