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Combination and method for mixing the contents of a blood collection tube and thereafter removing the mixing element

  • US 4,214,874 A
  • Filed: 02/08/1979
  • Issued: 07/29/1980
  • Est. Priority Date: 02/08/1979
  • Status: Expired due to Term
First Claim
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1. A method for mixing blood with anticoagulant in a collection tube and thereafter safely removing the mixing element therefrom, said method involving the preliminary steps of drawing blood into a collection tube containing anticoagulant, introducing a magnetic element into said tube, sealing the ends of the tube, and thereafter moving a magnet back and forth along the outside of the tube to shift the magnetic element within the tube and thereby mix the blood and anticoagulant together, wherein the improvement comprisesutilizing an elongated tubular resilient cap as the means for sealing at least one end of said tube, said cap providing an elongated cavity having a mouth portion sealingly and removably receiving an end of said tube and having a main cavity portion extending beyond said tube, moving said magnet to shift said element into said cavity of said cap after said blood and anticoagulant have been mixed in said tube, and thereafter removing and discarding said cap with the blood-coated magnetic element captured therein.

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