A - Human Necessities – 61 – M
Patent
A - Human Necessities
61
M
128/88
A61M 5/32 (2006.01)
Patent
CA 1042298
ABSTRACT A sealed hypodermic syringe comprising a cylindrical syringe body having a discharge opening at one end with a sealing mem- brane extending across the opening. A ferrule is disposed on the syringe body adjacent the discharge opening, the ferrule carrying a double-pointed needle and hub assembly arranged for longitudinal movement between an advanced position wherein the inner end of the needle is spaced from the sealing membrane, and a retracted position wherein the inner end pierces the membrane and communicates with fluid contained within the syringebody. A spring biases the needle to its retracted position, and a cover having a hollow bore houses the protruding portion of the needle. Press-fitted into the bore of the cover is an in- sert ring having locking shoulders which cooperate with ears the needle hub assembly to retain the needle in its advanced position against the action of the spring prior to the first use of the syringe. To ready the syringe for use the cover is turned slightly. This releases the advanced needle whereupon the action of the spring instantly snaps it to the retracted position. The inner end of the needle thereby pierces the sealing membrane and communicates with the syringe chamber, enabling discharge therefrom to be effected. Once the cover has been removed and the needle has snapped to its retracted, operative position, the cover can no longer be replaced and retained to house the needle. Thus, prior use of the syringe will be indicated. The advantage of the present invention over prior device of this type is that there is minimized any tendency toward binding between the ears of the needle hub and the locking shoulders on the cover. In Addition, rotation of the cover through one-quarter turn completely releases the needle hub and readies the syringe for use.
195825
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