SYRINGE HAVING A RETRACTABLE NEEDLE

摘要

A medical device (10) for delivering a medicament to a patient. The device includes a syringe barrel (24) with a plunger having a hollow front end and a stopper (30) positioned over the plunger front end to seal the plunger front end. The stopper is movably inserted in the barrel to expel medicament in the barrel. A needle cannula (25) is fixed to a needle cannula hub (34) and is movable between an initial position in which the forward tip of the needle cannula is exposed and a retracted position in which the forward tip is contained within the medical device . A plug seal (50) releasably secures the needle cannula hub to an end of the barrel, and a hub adapter secures the plug seal to the barrel end. A cutter positioned an the plunger pierces the stopper when the stopper is pressed against the plug seal to open the hollow front end of the plunger. The plunger also engages the plug seal to allow the needle cannula hub to move, via an urging member, to the retracted position through the front end of the plunger.