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Safety syringe needle device with interchangeable and retractable needle platform

  • US 5,122,124 A
  • Filed: 10/03/1990
  • Issued: 06/16/1992
  • 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 needle end thereof and removable therefrom in response to rotation relative to the barrel, the adapter having a central fluid passage and adapted for removable coupling to a hollow needle;

    (c) a plunger axially movable in the hollow barrel; and

    (d) adapter engagement structure disposed at the needle end of the plunger and engageable with a mating connection engagement structure on the adapter, said structures being engageable to enable subsequent rotation of the adapter relative to the barrel in response to relative rotation of the plunger and barrel, after substantially full axial insertion of said plunger in said barrel engages the plunger and adapter one with the other, thus enabling the adapter and any attached needle to be removed from the end of the barrel and to be withdrawn into the interior of the barrel when the plunger is rotated in a given direction and the plunger is withdrawn from the needle end of the barrel,said plunger including a needle end portion and an opposite end portion, said opposite end portion including connection structure at its distal end sized and designed to cooperate with complementary connection structure included at the needle end of said barrel;

    said plunger further including intermediate structure for detachably connecting said needle end and opposite end portions;

    whereby said opposite end portion of the plunger can be detached, and connected to the needle end of the barrel when the plunger has been withdrawn from the needle end of the barrel whether or not a needle connected to said engagement mechanism extends from said barrel.

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