Patent ID: 7300417

Claim:
A syringe for mounting to an injector for injecting fluids into an animal subject, said syringe comprising: a cylindrical barrel; a plunger snugly slidable in said cylindrical barrel, said plunger having a rearwardly facing drive ram engaging coupling element thereon in the shape of a rearwardly facing extension, wherein said rearwardly facing extension is knurled at least along the portion of said extension adapted to be within an area enveloped by a coupling mechanism, said coupling mechanism including at least one pivotally movable member having a face that engages at least a portion of the knurled portion of said extension, said knurls being a series of ridges or grooves that are not adapted to interlockingly engage with said coupling mechanism, and said rearwardly facing extension does not extend outside of said cylindrical barrel in at least one position of said plunger; and a discharge tip in fluid communication with a forward end of said cylindrical barrel.