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Vented, aspirating syringe

  • US 4,448,206 A
  • Filed: 12/13/1982
  • Issued: 05/15/1984
  • Est. Priority Date: 08/17/1981
  • Status: Expired due to Term
First Claim
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1. A syringe assembly comprising:

  • a tubular body open at one end and being adapted to receive a hypodermic needle at the other end thereof;

    a plunger, one end of which is adapted for insertion into said tubular body through said open end, said plunger having a longitudinal passageway for air flow therethrough;

    means for forming a fluid-tight seal between the outside surface of said plunger and the inside surface of said tubular body;

    an air permeable filter member extending across said passageway adjacent said one end of said plunger;

    a handle movably connected to the plunger to move the plunger within said tubular body; and

    said handle and plunger having mutually interengaging means forming valve means extending across said passageway between said filter member and said open end of said tubular body for selectively permitting the passage of air through said passageway, said valve means including relatively movable parts on said handle and plunger.

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