Single-use syringe with aspirating mechanism

Details Single-use syringe with aspirating mechanism Single-use syringe with aspirating mechanism

A - Human Necessities

61

M

A61M 5/315 (2006.01) A61M 5/50 (2006.01)

Patent

CA 2253973

This invention is a single-use syringe (10) having a rod-like plunger (14) and made with a plurality of frusto-conical or bead-like ratchet teeth (28). A radially resilient, spring locking clip (40) dangles on the ratchet portion of the plunger. The location of the clip determines the maximum dosage which can be administered by the syringe. Aspirating gaps (114) can be provided on the plunger rod to allow selective aspiration prior to loading and dispensing medication. In use, a first withdrawal of the plunger with respect to the barrel (12) allows, for aspiration, then medication can be drawn into the cavity of the barrel since the cam tooth (83) of the locking spring clip glides, by radial flexing, over the surface of the ratchet teeth and, yet, the locking spring is maintained in relative position along the barrel by outwardly directed contact points embedding into the interior sidewall of the barrel.

L'invention porte sur une seringue jetable (10) comprenant un piston en forme de tige (14) fait d'une suite de dents triangulaires (28) tronconiques ou perlées. Un coin de blocage à ressort (40) se balance librement sur la partie en dents de scie du piston. L'emplacement du coin détermine le dosage maximum pouvant être administré par la seringue. La tige du piston peut comporter des intervalles d'aspiration (113) pour permettre une aspiration sélective avant le chargement et l'injection du médicament. Lors de l'utilisation, un premier retrait du piston par rapport au cylindre (12) produit l'aspiration, le médicament peut alors pénétrer dans la cavité du cylindre car les dents (83) servant de cames du coin de blocage à ressort coulissent, par flexion radiale, sur la surface des dents de la crémaillère, et le ressort de blocage est maintenu en position relative le long du cylindre par des points de contact dirigés vers l'extérieur et s'engageant dans la paroi intérieure du cylindre.

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