Safety syringe

Details Safety syringe Safety syringe

2007-12-26

2009-11-03

Lucchesi, Nicholas D (Department: 3763)

Surgery

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

Treating material introduced into or removed from body...

C604S200000, C604S203000

Reexamination Certificate

active

07611489

ABSTRACT:
A safety syringe includes a barrel which has a hollow passage inside and is coupled with a barrel cover. A push rod has a distal end coupled with a rubber ring to form a close contact with the hollow passage in a slidable manner. A driving module has an inner detent member, a piston seat and a piston rubber ring held in the barrel cover. The push rod is movable forwards to push the inner detent member and the piston rubber ring of the driving module forwards to make a cut surface at one end of the push rod to hit one end of a first stem of the needle mount to be broken and separated so that continuous moving forward of the push rod causes instant release of air pressure inside to retract the needle mount in a holding chamber of the push rod to safely hold a needle after injection.

REFERENCES:
patent: 4331146 (1982-05-01), Brignola

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