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Plunger for syringe

  • US 6,129,712 A
  • Filed: 06/10/1999
  • Issued: 10/10/2000
  • Est. Priority Date: 11/05/1998
  • Status: Expired due to Term
First Claim
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1. A plunger for a syringe including a piston which is slidably inserted into a barrel and a rod connected to said piston, comprising:

  • a female thread formed at the center of said piston; and

    a male thread which is screw-engaged into the female thread of the piston;

    wherein the axial length T of the crest of the female thread and the root of the male thread which engages with the female thread is greater than the axial length t of the root of the female thread and the crest of the male thread.

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