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Disposable hypodermic syringe with needle safe feature

  • US 5,267,962 A
  • Filed: 06/10/1992
  • Issued: 12/07/1993
  • Est. Priority Date: 06/10/1992
  • Status: Expired due to Fees
First Claim
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1. An improved syringe comprising:

  • a hollow cylindrical barrel;

    a plunger having a length longer than said barrel mounted in said barrel for reciprocation, said plunger having a handle on the distal end of said plunger extending from the barrel and a piston mounted on the opposite end of said plunger in said barrel;

    a hollow sleeve having a closed end slidably mounted in one end of said barrel with its closed end at the needle end, said sleeve having an cylindrical interior which has an internal diameter smaller than the internal diameter of said barrel;

    a the hypodermic needle mounted in the closed end of said sleeve to externally project therefrom and having communication with its interior; and

    stop means associated with the piston end of said plunger operable to prevent withdrawal of said piston end of the plunger from said sleeve when said stop means enters said sleeve whereby withdrawing said plunger from said barrel after its piston end has entered said sleeve will pull said sleeve and its attached needle into said barrel encasing the needle and thereby preventing persons from thereafter being "pricked" by the sharp end of the needle after said syringe is used.

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