An implantable access device for intravenous delivery and/or withdrawal of fluids is described herein. The access device includes a septum which is movably supported within a housing of the access device from a retracted, low profile position to an extended, high profile position to facilitate easy identification...http://www.google.de/patents/US7981094?utm_source=gb-gplus-sharePatent US7981094 - Two position septum for implantable vascular access device
