A resiliently flexible body vessel or body cavity dilator that tapers toward one end and a transition zone that decreases in flexibility along the dilator away from the one end. The dilator can comprise a dilator arranged to be slid over a guidewire for use in the placement of an intraluminal graft bridging...http://www.google.es/patents/US6106540?utm_source=gb-gplus-sharePatente US6106540 - Dilator and introducer assembly
