Patent ID: 7824381
Filing Date: 2010-11-02
Classification: A61M

Abstract:
1. A safety disposable syringe comprising: (a) a barrel comprising front and rear open ends and defining a chamber therein and an axis, said barrel being formed with an inner shoulder adjacent to said front open end; (b) a plunger extending through said rear open end and into said chamber, and comprising a front end; (c) a piston mounted on said front end of said plunger and formed with a first engaging member; (d) a cannula; (e) a needle seat extending fittingly through said front open end of said barrel and comprising (f) an engaging flange extending radially and outwardly from said rear surface, and configured to abut against said inner shoulder of said barrel axially; wherein said rear seat portion defines a fluid passage comprising: (g) a second engaging member disposed on said rear surface, and axially aligned and engageable with said first engaging member; and (h) a sealing ring retained in said retaining groove and in sealing contact with said inner surface of said front open end of said barrel, wherein said radially extending section of said fluid passage has opposite ends, which are at the opposite sides of said central channel, and which extend outwardly through said outer surface of said rear seat portion of said needle seat respectively, said fluid passage having a pair of axially extending sections extending axially towards said front seat portion of said needle seat along said outer surface to communicate respectively with said opposite ends of said radially extending section and terminating at said partition region.