Retractable needle system

Details Retractable needle system Retractable needle system

1991-02-15

1993-02-23

Rosenbaum, C. Fred

Surgery

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

Treating material introduced into or removed from body...

604198, 604232, A61M 524

Patent

active

051885999

ABSTRACT:
A hypodermic injection system (7) with a retractable needle (9) wherein the needle (9) retracts within an interior cavity (71) of a syringe plunger (59), such that the needle (9) is confinedly held within the plunger (59). A cylindrical spring housing (21) has resilient fingers (23) which captures a spring (15) biasly holding a needle holder (11) against the retaining force of resilient fingers (23). The plunger (59) has a frangible end (65), which dissociates when the outwardly tapered shoulders (68) spread the resilient fingers (23), allowing the coiled spring (15) to eject the needle (9) and its holder (11) into the interior cavity (71) of the syringe plunger (59). A body fluid sampling embodiment employs the same functional elements except the plunger (59") is shorter and contains a linking needle (137) that communicates with a vacuum container (147). The container allows fluid sampling and provides the structure to release the spring (15") retracting the needle (9").

REFERENCES:
patent: 2752918 (1956-07-01), Uytenbogaart
patent: 4841985 (1989-06-01), Wanamaker
patent: 5019044 (1991-05-01), Tsao
patent: 5049133 (1991-09-01), Villen Pascual
patent: 5053010 (1991-10-01), McGary et al.
patent: 5064419 (1991-11-01), Gaarde

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