Patent ID: 7914489

Claim:
A spring clip for attachment to ratchet teeth of a basically cylindrical plunger of a single-use syringe with said plunger moveable within a barrel of the syringe, the plunger of said syringe moving upwardly and downwardly within the barrel of the syringe, said spring clip locking said plunger so that it is a single use syringe, said spring clip comprising opposed outwardly extending sections having spaced apart contact points to bear into the inner wall of said barrel, and a smooth, rounded arch-like structure connected between said spaced apart contact points, wherein said spring clip comprises a back section and an upwardly extending tab extending therefrom, with the lower clip edge of said spring clip being coplanar around the entire lower periphery of said spring clip, further comprising a tab member extending inwardly from said back section and a complementary notch formed at only one location on said plunger such that said tab of said spring clip connects to said plunger at only said one location along the barrel provided with said notch, said one location comprising a preset location, wherein said preset location along said plunger provides a predetermined volume in said barrel for allowing medicine to be pre-loaded in the syringe be no more than a predetermined amount.