The invention relates to a catheter (10, 11, 12) for introducing into a hollowhuman or animal organ. Said cathetercomprises a catheter tip (40, 41, 42) that protrudes forwards and a regionthat is encased by an expandable tubular hollow body (60,70) and that is situated behind the catheter tip (40, 41, 42). Said catheteris characterised in that a wire spiral (20, 21, 22) is locatedin the encased region. It can also be advantageous to provide a radiopaquering (100), in particular a platinum, gold or tungsten ring,on a hollow shaft (32) of the catheter, together with several rib-typeprojections (32.2...32.6) running around the hollow shaft (32)and projecting from the latter, in a region in front of and/or behind theradiopaque ring (100).
