The needle connector is made with a shielded connector which is slotted to slide over an arm of a Y-site connector. A needle within the shielded connector is able to pierce a rubber stopper or seal in the end of the Y-site connector. A rotatable ring on the shielded connector has a cam surface at the...http://www.google.de/patents/US4998713?utm_source=gb-gplus-sharePatent US4998713 - Needle connector
