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Syringe device having a vented piston

  • US 5,865,803 A
  • Filed: 05/19/1997
  • Issued: 02/02/1999
  • Est. Priority Date: 05/19/1997
  • Status: Expired due to Term
First Claim
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1. A syringe device for dispensing a material, comprising:

  • a hollow syringe barrel having an open first end and an open second end;

    a piston assembly positionable within said hollow syringe barrel, said piston assembly being capable of reciprocal movement within said hollow syringe barrel between a fully advanced position and a fully retracted position, said piston assembly including a first O-ring having an air pervious gap disposed therein, wherein said piston assembly contacts said hollow syringe barrel and forms a seal against said hollow syringe barrel that is substantially impervious to the material but is not impervious to the flow of air.

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