A percutaneous access device having at least one substantially rectilinear passageway that extends between the internal region of a living body and the region exterior of the body when the device is anchored therein. A second passageway intersects with the first so as to provide communication between...http://www.google.co.uk/patents/US4639247?utm_source=gb-gplus-sharePatent US4639247 - Percutaneous access device
