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Safety syringe needle device with interchangeable and retractable needle platform

  • US 5,462,531 A
  • Filed: 12/21/1994
  • Issued: 10/31/1995
  • Est. Priority Date: 12/14/1988
  • Status: Expired due to Term
First Claim
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1. A syringe comprising:

  • (a) a hollow, axially elongated barrel;

    (b) an adapter carried by said barrel adjacent a distal end thereof and removable therefrom in response to rotation relative to said barrel, the adapter carrying a needle and providing fluid communication with the interior of said hollow barrel;

    (c) a plunger axially movable in said barrel; and

    (d) adapter engagement structure disposed at the distal end of the plunger and engageable with a mating connection engagement structure on the adapter, said structures having respective drive and connective engagement surfaces, said drive surfaces being engageable with one another in response to axial movement of said plunger toward the distal end of said barrel and jointly movable upon engagement to enable rotation of the adapter relative to the barrel in response to relative rotation of the plunger and barrel to cause the adapter to part from the distal end of the barrel, said connective surfaces being engageable with one another to connect the plunger and adapter one with the other and enable said adapter, when parted from the end of the barrel in response to joint rotation of said adapter and said plunger relative to said barrel, to be withdrawn with the needle into the interior of the barrel in response to joint axial movement of said plunger and said adapter in a direction away from the distal end of the barrel.

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