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Retractable needle hypodermic syringe system

  • US 4,994,034 A
  • Filed: 07/11/1989
  • Issued: 02/19/1991
  • Est. Priority Date: 07/11/1989
  • Status: Expired due to Term
First Claim
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1. A hypodermic syringe system, comprising:

  • (a) a syringe barrel;

    (b) a syringe plunger including a frangible end sealing an interior cavity, said syringe plunger sized to be received within and slide through said syringe barrel;

    (c) an injection needle; and

    (d) a spring holding means associated with and held by said syringe barrel, for holding said injection needle and selectively retracting said injection needle into said interior cavity of said syringe plunger when said syringe plunger abuts against and moves beyond a portion of said syringe barrel, causing breakage of said frangible end, and allowing said frangible end of said syringe plunger to separate, wherein said spring holding means, comprising;

    a holder for holding said injection needle; and

    a spring means for exerting an expansive force between said holder and said spring holding means, wherein said spring holding means selectively holds said holder and said spring means therebetween while allowing said injection needle to extend through said spring holding means in an assembled condition wherein said holder has a lip, said spring holding means has extending resilient fingers with interior and inferiorly positioned hooks to retain said lip of said holder in an assembled condition wherein, said frangible end of said syringe plunger has an engaging and complementing surface which abuts up against said hooks of said extending resilient fingers, spreading said extending resilient fingers radially outwardly to release said lip against the expansive force of said spring means when said syringe plunger moves beyond said portion of said syringe barrel.

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