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Hypodermic needle assembly

  • US 5,643,222 A
  • Filed: 06/23/1995
  • Issued: 07/01/1997
  • Est. Priority Date: 08/23/1993
  • Status: Expired due to Term
First Claim
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1. A needle-syringe assembly, comprising:

  • an elongated, generally cylindrical barrel forming a hollow nozzle located at the distal end of said barrel and opening into the interior of said barrel;

    a plunger slidably mounted in said barrel and forming a longitudinal cavity;

    a needle holder carrying a hollow needle on the distal end thereof, said needle holder being slidably mounted in said longitudinal cavity of said plunger, said needle holder including a lateral arm extending laterally through said plunger cavity to said barrel; and

    guide means forming a spiral guide surface extending along a proximal end portion of said barrel for engaging the lateral arm of the needle holder and retracting the needle holder within the barrel in response to relative rotational movement between the barrel and the needle holder.

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