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SYRINGE

  • US 3,662,753 A
  • Filed: 05/25/1970
  • Issued: 05/16/1972
  • Est. Priority Date: 05/25/1970
  • Status: Expired due to Term
First Claim
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1. A syringe assembly capable of normally retaining two substances separated and of subsequently allowing mixing thereof, comprising:

  • an elongated barrel having a discharge end for cooperation with a syringe needle means, and a plunger inlet end;

    a plunger having a plunger head in said barrel and a plunger shaft extending through said plunger inlet end and to a position externally of said barrel to enable said plunger head to be shifted along said barrel;

    said barrel having at least two portions of differing diameters extending along its length, the larger being toward said plunger inlet end and the smaller toward said discharge end;

    said plunger head having releasable seal means operative to form a seal with respect to said barrel when said plunger head is shifted in said barrel toward said discharge end, to release the seal when said plunger head is shifted away from said discharge end and into said larger diameter portion, allowing passage of one substance therepast for mixing of the substances, and to form a seal with respect to said barrel when said plunger head is shifted in said barrel toWard said discharge end to discharge the mixed substances.

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