Patent ID: 6193687
Filing Date: 2001-02-27
Classification: A61M

Abstract:
A safety hypodermic syringe comprising:a barrel defining a cylindrical inside receiving chamber;a needle assembly, said needle assembly comprising a hollow needle hub, and a needle cannula, said needle cannula having one end fastened to said needle hub;a female connector slidably fitting the cylindrical inside receiving chamber of said barrel, said female connector comprising a connector body and an elastic band, said connector body comprising a front needle hub support part fastened to said needle hub of said needle assembly, a rear male connector receiving part connected to said front needle hub support part, a front hole at a front side of said front needle hub support part, a rear retaining hole at a rear side of said rear male connector receiving part, and a chamber in communication between said front hole and said rear retaining hole, said rear male connector receiving part comprising a plurality of springy stop blocks radially moved to reduce/expand said rear retaining hole radially, said elastic band being mounted on said rear male connector receiving part;a plunger, said plunger comprising a stopper at a front side thereof, and a thumb rest at a rear side thereof; anda male connector installed in the front side of said plunger and protruded over a front side of said stopper, said male connector comprising a shank forwardly extended from said stopper, and a head fixedly connected to a front end of said shank, said head having a small front part and a big rear part greater than said small front part, said retaining hole having a cross-sectional area smaller than the cross-sectional area of the big rear part of said head when radially reduced by said stop blocks.