Dual-chamber safety syringe

Details Dual-chamber safety syringe Dual-chamber safety syringe

1990-05-29

1991-08-06

Rosenbaum, C. Fred

Surgery

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

Treating material introduced into or removed from body...

A61M 532

Patent

active

050374028

ABSTRACT:
A hypodermic syringe incorporating a post-injection safety sheath for enclosing the sharpened needle tip. The hypodermic syringe incorporates parallel main and sheath chambers, the main chamber being to store fluid being injected or withdrawn, the parallel sheath chamber positioning the protective sheath. An axially aligned slot is disposed in the wall of the protective needle sheath and is aligned in communication with the ingress of the arcuate needle. A helical compression spring is coaxially aligned within the sheath chamber against the needle sheath biasing the sheath to enclosure the needle tip. When compressed, the needle sheath is withdrawn from the needle tip held in place through a detachable tab extending through the chamber wall.

REFERENCES:
patent: 3822701 (1974-07-01), Cloyd
patent: 4573976 (1986-03-01), Sampson et al.
patent: 4723943 (1988-02-01), Spencer
patent: 4850961 (1989-07-01), Wanderer et al.
patent: 4915696 (1990-04-01), Feimer
patent: 4932947 (1990-06-01), Cardwell
patent: 4946447 (1990-08-01), Hardcastle et al.
patent: 4978344 (1990-12-01), Dombrowski et al.
patent: 4982842 (1991-01-01), Hollister

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