Methods and apparatus for percutaneously accessing an implanted port using an access tube which is periodically introduced to the implanted port. The apparatus is preferably an implantable port having a pressure-responsive valve element. It has been found that repeated passage of the access tube through...http://www.google.de/patents/US20050209573?utm_source=gb-gplus-sharePatent US20050209573 - Method and apparatus for percutaneously accessing a pressure activated implanted port
