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Safety syringe

  • US 6,156,013 A
  • Filed: 11/04/1998
  • Issued: 12/05/2000
  • Est. Priority Date: 11/04/1998
  • Status: Expired due to Term
First Claim
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1. A safety syringe assembly, comprising:

  • an elongated, generally cylindrical barrel having a hollow interior forming a hollow nozzle located at a distal end of said barrel and opening into the interior of said barrel,a plunger slidably mounted in said barrel and having a longitudinal open channel;

    a needle;

    a needle holder mounting said needle at a distal end thereof and slidably mounted in said longitudinal open channel of said plunger for movement between an advanced position in which said needle on the distal end of said needle holder projects from a distal end of said nozzle, and a retracted position in which said needle is retracted within said barrel;

    a compression spring mounted inside of said barrel and means supporting a distal end portion of said spring against expansion;

    said spring urging said needle holder toward its retracted position; and

    a latch arrangement having a closed position in which said needle holder is latched relative to said barrel to hold said needle holder in its advanced position against the urging of said spring, and an open position in which said needle holder is unlatched relative to said barrel to allow said spring to expand in a proximal direction to move said needle holder to its retracted position;

    said latch arrangement including a radially projecting arm on one of said needle holder and said barrel by which the needle holder is directly or indirectly engaged with the barrel, at least when in its closed position.

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