Syringe having a retractable needle

Details Syringe having a retractable needle Syringe having a retractable needle

2004-01-20

2009-10-20

Sirmons, Kevin C (Department: 3767)

Surgery

Means for introducing or removing material from body for...

Treating material introduced into or removed from body...

C604S195000, C604S187000, C604S198000

Reexamination Certificate

active

07604613

ABSTRACT:
A medical device for delivering a medicament to a patient. The device includes a syringe barrel with a plunger having a hollow front end and a stopper 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 is fixed to a needle cannula hub 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 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 on 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.

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