Patent ID: 6423033
Filing Date: 2002-07-23
Classification: A61M

Abstract:
A safety hypodermic syringe comprising:a barrel, said barrel having a front neck and an inside locating groove inside the front neck of said barrel; a needle holder fitted into the front neck of said barrel and holding a needle cannula outside said barrel, said needle holder comprising an annular outside locating flange forced into engagement with the annular inside locating groove of said barrel, an annular outside groove disposed around the periphery thereof, and a rubber seal ring mounted in the annular outside groove of said needle holder and stopped against an inside wall of the front neck of said barrel; a tubular plunger inserted into said barrel, said tubular plunger having a rubber stopper fixedly provided at a front side thereof, said rubber stopper having a center through hole; and a pull handle inserted into said tubular plunger, said pull handle comprising a front handle body, a rear handle body, a middle neck connected between said front handle body and said rear handle body, said middle neck being breakable upon bending of said rear handle body relative to said front handle body, for enabling said rear handle body to be separated from said front handle body, and a front neck axially forwardly extended from a front side of said front handle body remote from said rear handle body and press-fitted into the center through hole of said rubber stopper of said tubular plunger; and fastening means provided at the front neck of said pull handle and said needle holder for enabling said needle holder and said needle cannula to be secured to the front neck of said pull handle and moved with said pull handle backwardly to the inside of said tubular plunger in said barrel after the service of the safety hypodermic syringe.