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Disposable syringe

  • US 5,496,285 A
  • Filed: 11/18/1994
  • Issued: 03/05/1996
  • Est. Priority Date: 11/19/1993
  • Status: Expired due to Fees
First Claim
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1. A disposable syringe for administering liquid medicinal agents;

  • comprising;

    a hollow cylinder having proximal and distal ends, said hollow cylinder being configured to receive a liquid;

    an injection needle located at the proximal end of the hollow cylinder;

    a piston made from a thermoplastically processable rubber mixture and being delimited in the proximal direction by a radially deflectable peripheral sealing lip, said piston being provided with a recess radially inside the sealing lip; and

    a piston rod, said piston being located at one end of the piston rod, said piston rod and said piston being configured to be slidable within the hollow cylinder so that the piston can be displaced by the piston rod within the hollow cylinder towards the injection needle at the proximal end of the cylinder;

    wherein the peripheral sealing lip on the piston contacts the hollow cylinder and is configured to be radially deformed so as to reduce the recess when driven by the piston rod towards the proximal end of the hollow cylinder.

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