A safety syringe includes two major components; a barrel and a plunger; a needle hub engaged with the barrel and a plunger slid ably received in the barrel to engage with the needle hub and to retract the needle hub into the barrel. A V-shape groove formed a thin membrane surround the needle hub. The...http://www.google.fr/patents/US6800067?utm_source=gb-gplus-shareBrevet US6800067 - Two-component safety syringe
