Pre-filled retractable needle injection ampoules

Details Pre-filled retractable needle injection ampoules Pre-filled retractable needle injection ampoules

2007-11-27

2007-11-27

DeSanto, Matthew (Department: 3763)

Surgery

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

Treating material introduced into or removed from body...

C604S195000

Reexamination Certificate

active

10724663

ABSTRACT:
Pre-filled injection ampoules for administering a readily-available dose of fluid medication, are provided with a retractable needle. The needle is held in a projecting configuration from a barrel against a rearward bias exerted on the needle by a spring located within a spring housing. A piston is positioned within the barrel for expelling the fluid medication therefrom. The piston is configured to release the needle after completion of an injection stroke and to receive the needle in an internal cavity. In alternative embodiments, a retractable-needle injection device includes a housing for receiving a pre-filled medication cartridge of the type having a slidable piston positioned therein. A stationary plunger is located within the housing for maintaining the piston at a fixed location as the cartridge is urged into the housing to administer an injection. After the end of an injection stroke, the cartridge is further urged into the housing to release a effectuate retraction.

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