Disclosed is an expandable percutaneous sheath, for introduction into the body while in a first, low cross-sectional area configuration, and subsequent expansion to a second, enlarged cross-sectional configuration. The sheath is maintained in the first, low cross-sectional configuration by a tubular...http://www.google.co.uk/patents/US20060200188?utm_source=gb-gplus-sharePatent US20060200188 - Expandable percutaneous sheath
