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One-shot syringe

  • US 5,380,285 A
  • Filed: 12/02/1993
  • Issued: 01/10/1995
  • Est. Priority Date: 06/10/1992
  • Status: Expired due to Fees
First Claim
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1. In a disposable syringe having a hollow cylindrical barrel closed at one end, a plunger having a length longer than said barrel mounted in said barrel for reciprocation, said plunger having a handle on its end extending from the barrel and a piston mounted on the opposite end of said plunger received in said barrel and a hypodermic needle mounted in said closed end of said barrel being in communication with the interior of said barrel, the improvement comprising:

  • a tapered section formed in said barrel adjacent to its closed end which has a decreasing diameters from its central section to its closed end; and

    disabling means associated with said piston end of said plunger operable to prevent re-use of said syringe once said disabling means has commenced traversing said tapered portion of said barrel, said disabling means including a collapsible piston core operable to be diminished in diameter by the tapered portion as the piston traverses said tapered portion of the barrel whereby said piston will not thereafter seal with the internal bore of said barrel if said piston is thereafter extracted from said tapered portion.

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