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Safety syringe needle device with interchangeable and retractable needle platform

  • US 5,415,638 A
  • Filed: 09/30/1993
  • Issued: 05/16/1995
  • 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 the 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;

    (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, said connective surfaces comprising latching surfaces engageable with one another in response to axial movement of said plunger toward the distal end of said barrel to positively connect the plunger and adapter one with the other such that said plunger and said adapter are substantially permanently locked to one another against relative axial movement with said plunger advanced fully axially within said barrel and seated against said adapter in final position relative to said adapter; and

    (e) said latching surfaces including a second radial projection on said one of said adapter and said plunger, said radial projections being relatively located and engageable with one another to provide an initial resistance to advancement of said plunger toward said distal end when said plunger lies in an axial position short of said finally seated position relative to said adapter, said plunger carrying a bung formed of a compressible material, said bung being compressed within said barrel in response to movement of said plunger from said axial position short of said finally seated position toward said finally seated position.

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