A balloon catheter comprises a balloon, an inner shaft, an outer shaft and a transition shaft. The transition shaft has a proximal portion and a distal portion joined by a tapered portion. The proximal portion has a diameter greater than the distal portion. The proximal portion has a first end portion...http://www.google.es/patents/US6953470?utm_source=gb-gplus-sharePatente US6953470 - Catheter support
