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Non-reusable syringe assembly

  • US 5,059,179 A
  • Filed: 05/15/1989
  • Issued: 10/22/1991
  • Est. Priority Date: 05/15/1989
  • Status: Expired due to Fees
First Claim
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1. In a syringe having an elongated, generally cylindrical barrel with a hollow interior and a hypodermic needle at one end of said barrel in sealed communication through an opening with the hollow interior of said barrel, the improvement comprising:

  • a plunger sized for disposition in tight-fitting engagement with the interior of said barrel for axial movement between said one end and an opposite end thereof;

    a plunger shaft extending axially through the interior of said barrel including means releasably connecting said shaft to said plunger whereby relative rotation of said shaft with respect to said plunger in one direction will cause disconnection of said shaft from said plunger, said releasable connecting means defined by male and female complementary threaded end portions between said plunger and said shaft; and

    means permanently affixed to said opposite end of said barrel for imparting rotation to said shaft in response to axial movement of said shaft through said barrel.

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