Patent ID: 6402721
Filing Date: 2002-06-11
Classification: A61M

Abstract:
A safety hypodermic syringe comprising:a needle assembly, said needle assembly comprising a needle cannula, a hollow needle hub having a front side holding said needle cannula and a rear side providing-with coupling means; a barrel defining a cylindrical inside receiving chamber, said barrel comprising a finger flange at a rear side thereof; and a plunger assembly, said plunger assembly comprising a stopper holder having a front side and a rear side, a stopper covered on the periphery of said stopper holder, and a plunger connected to the rear side of said stopper holder, said stopper holder comprising first coupling means disposed at the front side thereof and adapted to engage the coupling means of said needle hub for enabling said needle assembly to be pulled backwards with said plunger assembly and received inside said barrel, and a second coupling means disposed at the rear side thereof, said plunger comprises coupling means disposed at a front side thereof and coupled to the second coupling means of said stopper holder for enabling said stopper holder, said stopper and said needle assembly to be moved with said plunger upon back stroke of said plunger and said plunger to be disconnected from said stopper holder and removed from said barrel after said needle assembly has been received inside said barrel.