Disclosed is a balloon on a distal portion of a balloon angioplasty catheter. The section of the balloon onto which a stent can be mounted has a central segment that is substantially cylindrical in shape that is centered between two segments each having the shape of a sector of a prolate spheroid. This...http://www.google.co.uk/patents/US6221043?utm_source=gb-gplus-sharePatent US6221043 - Stent delivery catheter with enhanced balloon shape
