Patent ID: 6800067
Filing Date: 2004-10-05
Classification: A61M

Abstract:
A safety syringe having a barrel, a needle hub engaged with said barrel and a plunger slidably received in the barrel to engage with the needle hub so as to retract the needle hub into the barrel, wherein the improvement comprise:a. a V-shaped groove formed at a thin membrane surrounding the needle hub, wherein the V-shaped groove separates the needle hub and the barrel into an inner periphery of the barrel and an outer periphery of the hub, wherein the inner periphery of the barrel is thicker than the thin membrane; b. a plurality of pyramidal blocks extended from the outer periphery of the hub facing outward to the barrel; and, c. a plurality of triangular cutouts with a V-shaped groove edge defined in the inner periphery of the barrel respectively corresponding to one of the plurality of pyramidal blocks.