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Syringe shielding assembly

  • US 5,106,379 A
  • Filed: 04/09/1991
  • Issued: 04/21/1992
  • Est. Priority Date: 04/09/1991
  • Status: Expired due to Fees
First Claim
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1. A syringe comprising:

  • (a) a cylindrical syringe barrel having a interior chamber;

    said barrel having a needle secured at a front end and a plunger slidingly received within the interior chamber;

    (b) a boss extending radially outward from said cylindrical syringe barrel;

    (c) a sheath slidingly positioned on said cylindrical syringe barrel and movable between a retracted needle exposing position and an extended needle surrounding position;

    said sheath having a slot therein to receive said boss;

    said slot including a longitudinal portion extending parallel to an axis of the syringe barrel and a laterally extending portion extending laterally with respect to said cylindrical syringe barrel and joined to said longitudinal portion;

    (d) a spring biasingly urging said sheath towards the extended needle encircling position;

    said spring being secured to said cylindrical syringe barrel and said sheath such that said spring biasingly rotates said boss into said laterally extending portion of said slot as said sheath is advanced to said extended needle surrounding position such that when said boss is positioned in said laterally extending portion of said slot said sheath may not be retracted due solely to axial forces acting on said sheath; and

    (e) restraining means for selectively restraining said sheath in said retracted needle exposing position;

    (f) release means for selectively releasing said sheath from said restraining means so as to allow said spring to advance said sheath to said extended needle surrounding position.

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