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.

Abstract: A hypodermic syringe provided with a safety hypodermic needle and shield assembly to obviate the danger of a handler thereof being accidentally pricked by the point of the needle after it has been injected in a patient and then withdrawn, the withdrawn needle possibly being contaminated with infectious microorganisms. The assembly includes a needle-supporting hub receivable in a socket formed at the front end of a fluid chamber in a standard syringe provided with a projecting nozzle which is inserted in the hollow base of the hub to communicate with the needle. Anchored on top of the hub which serves as a pedestal therefor and surrounding the needle is a helical spring, the convolutions in the upper section of the spring forming a cone and terminating in a sheild through whose center passes the axis of the helix. The normal length of the spring is such as to place the shield in the protective mode of the assembly in front of the needle point to prevent human contact therewith.

Abstract: A hypodermic syringe provided with a safety hypodermic needle and shield assembly to obviate the danger of a handler thereof being accidentally pricked by the point of the needle after it has been injected in a patient and then withdrawn, the withdrawn needle possibly being contaminated with infectious microorganisms. The assembly includes a needle-supporting hub receivable in a socket formed at the front end of a fluid chamber having a projecting nozzle which is inserted in the hub to communicate with the needle. Integral with the hub is a cup-like pedestal on which is anchored a compressible helical spring that surrounds the needle and terminates in a shield having a bore therein to permit the needle to pass therethrough, the normal length of the spring being such as to place the shield just above the point of the needle.