Safety hypodermic needle and shielding cap assembly

Details Safety hypodermic needle and shielding cap assembly Safety hypodermic needle and shielding cap assembly

1992-11-25

1993-09-21

Yasko, John D.

Surgery

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

Treating material introduced into or removed from body...

604198, A61M 532

Patent

active

052464270

ABSTRACT:
A safety hypodermic needle and shielding cap assembly for a standard syringe whose fluid chamber is provided at its front end with a projecting nozzle coaxial with a coupling socket. The assembly includes a needle-supporting hub whose hollow base is coupled to the socket of the syringe, the nozzle then communicating with the needle. Encircling the hub and attached thereto is a resilient actuator collar defining an annular space within which is received the lower end of a helical spring surrounding the needle extending from the hub. The upper end of the spring is received in the cavity of a shielding cap having a center bore therein through which the needle is passable. The cap is tethered by opposing lines of unequal length to the collar. In the retracted mode of the assembly, the spring is compressed by the cap, which is provided with a pair of opposed lugs that are inserted in corresponding slots in the long sides of the collar, thereby latching the cap and exposing the needle, so that it can be injected into a patient. After the needle is withdrawn, the assembly is put in its operative mode by squeezing the collar at its short sides to disengage the lugs and release the cap which is carried by the expanding spring to a position covering the needle point, the tether lines of unequal length acting to cant the cap to offset its bore with respect to the needle point.

REFERENCES:
patent: 5013305 (1991-05-01), Opie et al.
patent: 5092851 (1992-03-01), Ragner

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