Multi-chamber safety syringe

Details Multi-chamber safety syringe Multi-chamber safety syringe

1990-08-10

1991-06-25

Yasko, John D.

Surgery

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

Treating material introduced into or removed from body...

604198, 604263, A61M 532

Patent

active

050263536

ABSTRACT:
A hypodermic syringe incorporating a post-injection safety sheath for enclosing the needle tip. The hypodermic syringe incorporates a central chamber and two slide chambers disposed on opposite sides of, and in parallel spaced relation to the central chamber. The central chamber is used to store fluid being injected into or withdrawn from the patient. The slide chambers enclose compressive apparatus for positioning the protective sheath. A helical compression spring is coaxially aligned within each of the slide chambers, each being coupled to the protective sheath. When the helical springs are positioned in the compressed state, the protective sheath is urged away from the distal end of the needle and maintained in position through a pair of release tabs extending through the walls of the slide chambers. When extended, the needle tip is closed within the protective sheath.

REFERENCES:
patent: 2722215 (1955-11-01), Dahlgren
patent: 4838869 (1989-06-01), Allard
patent: 4874382 (1989-10-01), Lindemann et al.

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