Balloon catheter

Balloon catheter for exerting internal pressure on surrounding tissue of a mammalian duct or cavity in a section thereof having a substantially circular cylindrical configuration, comprising an elongate, rigid distal section and a flexible and elastic balloon accommodating said distal section which, together with said balloon is intended for insertion into said duct or cavity section, further comprising means for the supply of a pressure medium for the expansion of said balloon, the catheter further comprising an intermediate section and a proximal section for operating the device, characterized in that said distal and intermediate sections contain a central tube, whose distal part is provided with at least one outlet for said medium within said balloon, and whose intermediate part is surrounded by an axially displacable tube, onto whose distal end the proximal end of said balloon is attached, further characterized in that said balloon has an envelope which is constituted by at least one substantially gas- and liquid-impermeable and elastic internal layer and a restricting layer of limited radial expansion, said expansion being substantially independent of the axial length of said balloon, the catheter including means for axially interlocking said tubes to each other in a position corresponding to a desired length of said balloon.