Patent ID: 7156860

Claim:
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, means for the supply of a pressure medium for the expansion of said balloon, an intermediate section and a proximal section for operating the device wherein said distal and intermediate sections contain a central tube, a distal part of the central tube is provided with at least one outlet for said medium within said balloon, and an intermediate part of the central tube is surrounded by an axially displaceable tube, a distal end of the displaceable tube has the proximal end of said balloon attached, and 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, and means for axially interlocking said central and axially displaceable tubes to each other in a position corresponding to a desired length of said balloon.