Patent ID: 6616640
Filing Date: 2003-09-09
Classification: A61M

Abstract:
A syringe, comprising:a hollow barrel having an open end portion, a needle mounting portion, and a tubular needle hub extending from said needle mounting portion to provide a needle passageway therethrough; a hollow needle having a tissue penetrating end and a tip end thereof affixed with a cylindrical tip head, wherein said tip head of said hollow needle is disposed in said needle mounting portion with said tissue penetrating end penetrating through said needle passageway; a mounting seat integrally affixed within said needle mounting portion of said hollow barrel for securely mounting said tip head of said hollow needle in position; a hollow plunger adapted to travel through said hollow barrel, said hollow plunger having an outer closed end and an inner end inserted in said hollow barrel through said open end portion of said hollow barrel; a needle retraction arrangement received in said hollow barrel for retracting said hollow needle into said hollow plunger; and a plunger anti-detachment mechanism, comprising: at least a locking stopper radially extended on said hollow barrel; and at least a resilient arm, having a locking latch outwardly extended therefrom, radially extended from said hollow plunger wherein said resilient arm is adapted to move from an unlocked position to a locked position, wherein at said unlocked position, said locking latch of said resilient arm is moved away from said locking stopper such that said hollow plunger is capable of freely traveling through said hollow barrel in a coaxially movable manner, and that at said locked position, said hollow needle is retracted in said hollow plunger and said locking latch of said resilient arm is extended to said locking stopper so as to block an axial movement of said hollow plunger with respect to said hollow barrel, so that said hollow plunger is interlocked with said hollow barrel to retain said hollow needle in said hollow plunger.