Retractable needle hypodermic syringe system

Details Retractable needle hypodermic syringe system Retractable needle hypodermic syringe system

1989-07-11

1991-02-19

Pellegrino, Stephen C.

Surgery

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

Treating material introduced into or removed from body...

604198, A61M 524

Patent

active

049940341

ABSTRACT:
A hypodermic injection system with a retractable needle wherein the needle retracts within the interior cavity of a syringe plunger, so that the needle is safely and confinedly held within the plunger for ease of handling and transport, while remaining safely therein. A cylindrical spring housing has resilient fingers which can capture a coiled spring which biasly holds a needle holder against the retaining force of the resilient fingers. The plunger has a frangible end, which, when engaging the resilient fingers under a pre-determined amount of force, dissociate while remaining inwardly-tapered shoulders spread the resilient fingers, allowing the coiled spring to eject the needle and its holder into the interior cavity of the syringe plunger.

REFERENCES:
patent: 3046985 (1962-07-01), Saenz
patent: 3306290 (1967-02-01), Weltman
patent: 4747831 (1988-01-01), Kulli

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