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Phlebotomy needle assembly

  • US 4,280,496 A
  • Filed: 02/16/1979
  • Issued: 07/28/1981
  • Est. Priority Date: 02/16/1979
  • Status: Expired due to Term
First Claim
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1. In a phlebotomy needle assembly through which whole blood is drawn through a cannula and mixed with an anticoagulant, and including a cannula extending from a hub;

  • a blood-anticoagulant mixing device including an upper portion comprising an anticoagulant solution inlet for coupling to a source of anticoagulant and a blood-anticoagulant mixture outlet for coupling to outlet tubing, and an elongated member extending downwardly from said anticoagulant inlet said elongated member defining a bore that is coaxial with said anticoagulant inlet;

    a lower portion comprising a housing for surrounding said elongated member and a blood inlet for coupling to said hub, said inlet extending downwardly from said housing;

    said upper portion and said lower portion being initially separable;

    said mixture outlet being offset with respect to said inlets;

    said blood inlet defining a mixing chamber whereby the anticoagulant solution fed into the anticoagulant inlet enters directly into the mixing chamber to mix with the whole blood, said mixing chamber comprising the volume defined by said blood inlet and located below said elongated member;

    a passage defined by said mixing device and communicating with said mixing chamber and said mixing outlet for providing an outlet flow path through said mixing device for the blood-anticoagulant mixture; and

    a radially extending flange extending from said upper portion and a radially extending flange extending from said lower portion, and means connecting the bottom of said upper flange portion to the top of said lower flange portion.

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