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Air-noncontact type blood sampling assembly

  • US 3,930,492 A
  • Filed: 08/21/1974
  • Issued: 01/06/1976
  • Est. Priority Date: 08/21/1974
  • Status: Expired due to Term
First Claim
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1. An air-noncontact type blood sampling assembly for collecting arterial blood directly from an arterial blood vessel through a needle without entrainment of ambient air which comprises in combination:

  • A. a sampling container for containing arterial blood including;

    a. a tubular body having forward and rearward open ends and having a small circumferential rib adjacent the forward end,b. a needle-pierceable elastomeric stopper hermetically inserted into and sealing the forward end opening section of said tubular body, the partial circumferences of the stopper and the forward end section of said tubular body including said rib being covered with a sealing member hermetically sealing the stopper to said tubular body,c. a columnar gasket disposed within said tubular body and having means for slidable, air tight movement in said tubular body due to arterial blood pressure, wherein said means includes a first circumferential projection near its forward end and a second circumferential projection spaced apart therefrom, the outer diameter of the two projections being slightly larger than the inner diameter of said tubular body thereby the gasket may slidably air-tightly move in said tubular body due to arterial blood pressure, the forward end plane of the gasket in its most forward position within the tubular body, the inner wall of said tubular body and rear end plane of said stopper defining a space having a capacity equivalent to a predetermined amount of blood anticoagulant,d. blood anticoagulant in an amount slightly larger than said predetermined amount contained in said tubular body between said stopper and said gasket; and

    e. a plunger fixedly secured to said gasket;

    B. a cylindrical transparent holder having an open rear end and a restricted forward end comprising a threaded hole, embracing said sampling container, the inner diameter of said holder being slightly larger than the outer diameter of said tubular body of said sampling container, and;

    C. a needle having a forward end portion and a rearward end portion integrally joined by an intermediate portion, piercing ends on said forward and rearward portions, a hub on said intermediate portion, said hub being screwed into said threaded hole in said holder, said rearward portion being of such length that at least the blade plane of the piercing end of said rearward portion will protrude from the rear end of said stopper when the sampling container is moved to its most forward position within said holder.

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