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Single-use safety syringe

  • US 5,049,133 A
  • Filed: 01/23/1990
  • Issued: 09/17/1991
  • Est. Priority Date: 01/24/1989
  • Status: Expired due to Fees
First Claim
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1. A single-use safety syringe comprising:

  • a body for containing a fluid, said body having a projection and a chamber;

    a needle having a head end and a hollow core for receiving the fluid, said head end being positioned in said chamber below said projection when the syringe is in use;

    piston means positioned in said body above said needle for pushing the fluid into said needle when the syringe is in use;

    a spring coiled around said needle below said head end and positioned in contact with said head end and said body, said spring expanding after use of the syringe so that said needle is propelled into the upper end of said body above said projection; and

    a pressure hinge positioned on said projection having a plurality of teeth-shaped triggers, said piston means having at its lower end retention means engaging the inner wall of said chamber in the vicinity of said triggers, whereby said triggers both retain said head end below said projection to prevent expansion of said spring as the syringe is in use and bear against said retention means to prevent motion of said piston means after deformation of said triggers by said piston means and expansion of said spring.

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