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Automated blood analysis system

  • US 3,910,256 A
  • Filed: 07/22/1974
  • Issued: 10/07/1975
  • Est. Priority Date: 12/29/1972
  • Status: Expired due to Term
First Claim
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1. A method of timing of blood withdrawal and examination system connected to a patient via a catheter, comprising the steps of:

  • filling the system with at least one biologically inert fluid;

    calibrating the system;

    withdrawing blood, upon command, from the patient through the catheter into the system in fluid-to-fluid contact with the inert fluid;

    sensing the inert fluid/blood interface at a blood examination site;

    automatically and instantaneously discontinuing the withdrawal step when the sensing step occurs;

    applying pressure to the inert fluid to push substantially all of the blood out of the system through the catheter and back into the patient.

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