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Syringe piston with check valve seal

  • US 8,574,201 B2
  • Filed: 12/17/2010
  • Issued: 11/05/2013
  • Est. Priority Date: 12/22/2009
  • Status: Active Grant
First Claim
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1. A fluid syringe comprising:

  • a syringe barrel comprising an interior wall and a sealed main fluid chamber;

    a syringe piston slidably coupled within the syringe barrel, the syringe piston comprising a piston seal forming an interference fluid seal against the interior wall; and

    a check valve seal coupled to the syringe piston and located between the piston seal and the main fluid chamber, the check valve seal forming an interference fluid seal against the interior wall when the syringe piston is unloaded, and the check valve seal disengaging the interior wall to allow gas flow from the main fluid chamber toward the piston seal when the syringe piston is loaded.

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