A dilatation catheter having an outer tubular balloon portion with length-wise circumferential crimps having at either end transition portions with longitudinal crimps across the axis and an inner catheter is provided. The distal transition portion is fastened to the distal end of the inner catheter...http://www.google.co.uk/patents/US4896669?utm_source=gb-gplus-sharePatent US4896669 - Dilatation catheter
