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Method and apparatus for measuring the aggregation of blood platelets or the coagulation of blood

  • US 4,780,418 A
  • Filed: 11/19/1986
  • Issued: 10/25/1988
  • Est. Priority Date: 11/19/1985
  • Status: Expired due to Term
First Claim
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1. A method for measuring the extent of aggregation of blood-platelets in blood or the extent of coagulation of blood comprising the steps of:

  • positioning a capillary tube, having first and second ends, adjacent a vessel containing a quantity of blood;

    positioning a syringe type arrangement comprising a cylinder and a piston adjacent said capillary tube, said first end of said capillary tube extending into said vessel and being in communication with the blood in the vessel and said second end of said capillary tube communicating with the cylinder of the syringe type arrangement;

    operating said piston to draw blood from the vessel into said capillary tube, thereby defining a pressure space between the piston and the blood in the capillary tube;

    moving the piston in a desired manner to thereby move the blood in the capillary tube in a desired manner;

    measuring the pressure in the pressure space;

    controlling the moving of said piston based on the pressure measurements to thereby control the pressure in said pressure space in a predetermined manner; and

    measuring the flow rate of the blood in the capillary tube as a measure of the extent of aggregation of blood-platelets in the blood in the capillary tube or the extent of coagulation of the blood in the capillary tube.

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