Safety shield system for a plastic syringe

摘要

A medical device for delivering a medicament to a patient includes a syringe assembly having a barrel defining a reservoir for the medicament, a needle coupled to the forward end of the barrel, and a plunger having a stopper positioned in the reservoir. The plunger is movable within the reservoir to urge the medicament to be expelled from the reservoir. An outer shield having a forward end and a rear end is movable on the barrel from a first position to a second position in which the forward tip of the needle is positioned between the forward and rear ends of the outer shield. An urging member is connected to the outer shield. The plunger interacts with the outer shield to charge the urging member when the needle cannula is inserted into the patient for moving the front of the outer shield toward the second position when the needle is removed from the patient.