Method and apparatus for disintegration of urinary concretions

An apparatus for disintegration of urinary concretions comprising:

• a catheter for insertion into the ureter;
• a bushing having an axial bore coaxially mounted on one end of said catheter, having an inwardly projecting annular lip, said lip defining an axial bore smaller than the axial bore of said bushing and being provided with longitudinal through ducts extending through said lip for the supply of liquid to the region of the concretion;
• an operating element within said catheter adapted to act upon the concretion and provided with a bearing surface adjacent said lip having a cross section larger than the axial bore defined by said lip, said bearing surface interacting with said lip inside said bushing for restriction of axial movement of said operating element from said bushing;
• and
• a coupling member supporting said operating element on one end, means connected to said coupling member on the opposite end for transmitting power to said operating element via said coupling member to activate it, said coupling member being coaxially disposed in said catheter;
• and
• wherein said bushing and the lip thereof are shaped and sized to permit alternate mounting of a milling cutter and a discharge arrester to be used as said operating element.