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Hypodermic syringe

  • US 4,254,768 A
  • Filed: 09/14/1979
  • Issued: 03/10/1981
  • Est. Priority Date: 09/14/1979
  • Status: Expired due to Term
First Claim
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1. A multiple barrel hypodermic syringe, comprising:

  • a lower barrel having an outlet port for a hypodermic needle;

    an upper barrel providing a removable hypodermic plunger at its upper end and a displaceable or frangible bottom seal at its lower end, the upper barrel being adapted to contain liquids or solids therein, the upper and lower barrels being sealed from each other solely by means of the bottom seal;

    the upper and lower barrels being sized for sliding engagement along their respective outer and inner peripheries;

    one or more grooves defining vent slots which connect the lower barrel interior solely to atmosphere, the vent grooves extending along a barrel periphery to permit gas, air and moisture to escape solely to atmosphere when the barrels are partly engaged, the vent slots being occluded to seal the lower barrel and its contents from the atmosphere, when the two barrels are substantially engaged;

    the upper and lower barrels being adapted to contain a liquid or solid, whereby disengagement of the barrels and hypodermic plunger enables separate removal and replacement of material from its respective barrel, without contamination of material in adjacent barrels.

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