A needle guard assembly for a syringe adapted to receive a hypodermic needle assembly. The guard assembly includes a needle guard that is slidably mounted on a needle-supporting hub. The needle guard may be moved from a latched position wherein the needle is fully protected by the guard to a position...http://www.google.fr/patents/US6190361?utm_source=gb-gplus-shareBrevet US6190361 - Selectively lockable needle guard
