A closed system, spikeless, positive-flow valve device includes a body defining an internal cavity. At the proximal end of the body is an opening which is preferably sufficiently large to receive an ANSI standard tip of a medical implement. The valve includes a plastic, resilient silicon seal which fills...http://www.google.fr/patents/US6932795?utm_source=gb-gplus-shareBrevet US6932795 - Positive flow valve
