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BLOOD COAGULATION DETECTION METHOD AND APPARATUS

  • US 3,699,437 A
  • Filed: 08/21/1969
  • Issued: 10/17/1972
  • Est. Priority Date: 09/27/1968
  • Status: Expired due to Term
First Claim
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1. The method of detecting coagulation of a fluid sample comprising the steps of:

  • placing the sample in electrical circuit with a source of electrical energy;

    causing said energy to pass principally through portions of said sample adjacent its periphery whereby changes in electrical impedance of said sample which are indicative of coagulation will take place over a period of time, said changes in electrical impedance being in the nature of lowering to a minimum and thereafter beginning to rise from said minimum upon coagulation of said sample;

    monitoring said electrical impedance and determining from said monitoring the rate of lowering of said impedance; and

    terminating said step of monitoring prior to said electrical impedance reaching said minimum whereupon the time of coagulation may be predicted from said determination of said rate of lowering of said impedance.

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