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Multiple tube perfusion sampler

  • US 5,505,721 A
  • Filed: 09/16/1993
  • Issued: 04/09/1996
  • Est. Priority Date: 09/16/1993
  • Status: Expired due to Fees
First Claim
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1. A multiple sample blood collection device comprising;

  • a. an elongated, generally cylindrical, blood sample tube holder having first and second ends, said first end including a plurality of apertures symmetrically disposed about the central axis of said tube holder and adapted to receive individual evacuated blood sample tubes;

    b. a venipuncture needle positioned in said second end coaxially positioned on said central axis of said holder, said venipuncture needle having a first end for insertion into the body from which blood is to be drawn and a second end positioned within said tube holder;

    c. a sample tube filling needle positioned within each of said apertures in said tube holder and having a first end for insertion into an evacuated sample tube and a second end for receiving blood from said venipuncture needle;

    d. an elastomeric nipple affixed to said sample tube holder and positioned over said first end of said sample tube filling needle to prevent flow of blood unless punctured by said first end of said sample tube filling needle when said first end is inserted into an evacuated sample tube;

    e. a manifold chamber connecting said second end of said venipuncture needle and said second ends of each of said sample tube filling needles;

    f. said manifold chamber comprising a central chamber portion symmetrically arranged with respect to said second end of said venipuncture needle and a plurality of sample tube filling passages branching therefrom in symmetrical relationship whereby laminar flow of blood is maintained during transfer of blood from second end of said venipuncture needle to said second end of said sample tube filling needle to minimize the damage to red blood cells during blood sample collection;

    g. a loader for multiple sample tubes, and a first end of said loader having a plurality of sample tube cavities therein, each said sample tube cavity being arranged for alignment with a corresponding one of said plurality of apertures in said blood sample tube holder;

    h. wherein said sample tube loader includes a second end, opposite said first end, for the application of force to move sample tubes held therein into said plurality of apertures and cause said first ends of said sample tube filling needles to puncture said elastomeric nipples and plugs in the open ends of sample tubes; and

    ,i. wherein said sample tube loader has a centrally positioned stop portion on said first end adapted to engage said sample tube holder and limit the distance to which said sample tubes may be inserted into said holder.

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