Patent ID: 7621888
Filing Date: 2009-11-24
Classification: A61M

Abstract:
1. A safety syringe device comprising: a barrel, said barrel comprising a fluid chamber, a front wall, a race, and a tubular neck being integrally formed, said tubular neck extending forwardly and perpendicularly from said front wall, said tubular neck defining a fluid passage in communication with said fluid chamber, a race forwardly and perpendicularly extending from said front wall and being a cylindrical wall extending around said tubular neck, a spiral tear groove formed on said front wall adjacent to said race, said front wall is removably connected to adjoining ends of said race and said fluid chamber by said spiral tear groove, and an annular retaining rib extending around an inside wall of said tubular neck adjacent to said front wall; a needle assembly, said needle assembly comprising a hub fitted onto said tubular neck of said barrel and a needle cannula forwardly extending from said hub; a plunger, said plunger comprising a head at a front side of a shank thereof, a front extension rod axially forwardly extending from said head, a conical front tip, and a first neck axially connected between said front extension rod and said conical front tip; a flexible stopper fitting the diameter of said fluid chamber of said barrel, said stopper having a longitudinal open chamber axially extending to a rear side thereof and a front center through hole forwardly extending from said longitudinal open chamber to a front side thereof for the passing of the front extension rod of said plunger; and a flexible support ring sleeved onto said tubular neck and stopped against an exterior surface of said front wall of said barrel and located between said tubular neck and said race of said barrel and located between said race of said barrel and said front wall of said barrel; wherein when pushed said plunger moves forward after the service of the syringe device, said spiral tear groove is broken to separate said front wall from said barrel enabling the broken front wall and said needle assembly to be pulled with said plunger to an interior of said barrel upon a return stroke of said plunger at this time, wherein the spiral tear groove begins at a central point and coils increasingly outwards from the central point, wherein said flexible support ring is located between said spiral tear groove and said race and said flexible support ring preventing said spiral tear groove from breaking due to a movement of said needle assembly when said needle assembly is sleeved onto said tubular neck, wherein said plunger has a stopper holder located between said head and said conical front tip of said plunger and having a parachute-like front skirt and a parachute-like rear skirt spaced apart and located around an exterior periphery of said front extension rod for holding said stopper, said parachute-like front skirt is located between said first neck and said parachute-like rear skirt; said stopper has an inside annular flange formed in the rear side of said longitudinal open chamber opposite said front center through hole; wherein said parachute-like front skirt and said parachute-like rear skirt are moveable between a first position and a second position relative to said plunger, when said parachute-like front skirt and said parachute-like rear skirt are located in the first position, said inside annular flange of said stopper is located between said parachute-like front skirt and said parachute-like rear skirt of said stopper holder of said plunger and said front center through hole of said stopper is located between said parachute-like front skirt and said first neck of said plunger, wherein when said parachute-like front skirt and said parachute-like rear skirt are located in the second position, parachute-like front skirt and said parachute-like rear skirt of said stopper holder of said plunger are located between said inside annular flange of said stopper and said front center through hole of said stopper.