Patent ID: 7815639

Claim:
A urological resectoscope comprising: a tubular, metallic external stem fitted with holes in its distal end zone, a tubular insulating element being affixed distally to said external stem, a tubular internal stem configured within said external stem and resting distally against said external stem in a sealing manner, and an electrode support longitudinally displaceable inside said internal stem and supporting a cutting loop in the region of the insulating element, wherein the inside space of the internal stem and the gap between the stems is proximally connected to liquid hookups, wherein the internal stem and the electrode support are connected to the outer stem in a manner allowing the internal stem and the electrode support to be proximally pulled out of the external stem, wherein the external stem and the insulating element are configured in a longitudinally mutually overlapping manner within an affixation zone, wherein the external stem bulges in the region directly proximal to the affixation zone in the form of a beveled transition increasing in width obliquely and distally to the wall thickness of the insulating element and wherein the thickness of the external stem varies in this region wherein the insulating element exhibits a wall thickness distally from the affixation zone larger than the wall thickness of the external stem, and wherein the inside diameter of the insulating element is the same as the inside diameter of the external stem.