The present invention provides devices, systems, methods and kits for endoscopically accessing a body cavity and providing a directed pathway toward a target tissue within the cavity. The directed pathway is provided by an access sheath which is positioned in a desired configuration, generally directed...http://www.google.es/patents/US20040044350?utm_source=gb-gplus-sharePatente US20040044350 - Steerable access sheath and methods of use
