Means and method of blood viscosity determination

A - Human Necessities – 61 – B

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A61B 5/02 (2006.01) A61B 5/15 (2006.01) G01N 11/00 (2006.01) G01N 11/06 (2006.01) G01N 33/48 (2006.01)

Patent

CA 1055727

ABSTRACT OF THE DISCLOSURE An apparatus and method of determining blood viscosity of blood in the body is disclosed. Venous pressure in a body vein is maintained at a constant pres- sure, blood is then withdrawn from the vein at a constant pressure for a period of time and the volume of blood with- drawn is determined to obtain an indication of blood vis- cosity when in the body. The time period may be constant and the blood volume is then inversely proportional to body blood viscosity. In another embodiment a predetermined volume of blood is withdrawn and the time period is mea- sured which is directly proportional to blood viscosity in the body. The diagnostic apparatus comprises a hollow needle, a means for withdrawing and collecting blood from the vein through the hollow needle, a negative pressure measuring de- vice such as a vacuum gauge for effectively measuring the negative pressure used to withdraw the blood and a timing device. The in vivo blood viscosity thus measured is directly proportional to the time required to withdraw a predetermined volume of blood and inversely proportional to the volume of blood withdrawn during a fixed time interval.

250899

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