Apparatus and methods are provided for accessing body lumens and/or for delivering instruments into body lumens, e.g., vessels within a patient's vasculature. A flexible sheath is provided that is expandable from a contracted condition to an enlarged condition wherein the sheath at least partially defines...http://www.google.de/patents/US7762995?utm_source=gb-gplus-sharePatent US7762995 - Expandable guide sheath and apparatus and methods using such sheaths
