METHOD FOR DETERMINING BLOOD VISCOSITY FACTOR WITH USE OF CAPILLARIES Russian patent published in 2014 - IPC G01N11/00 

FIELD: medicine.

SUBSTANCE: method for determining a blood viscosity factor with the use of capillaries involves recording reference blood position in these capillaries at the specified times determined by a formula determining a blood viscosity value (the viscosity factor) through the derived reference values. The reference blood distances covered in the capillary by the specified successive times are recorded with vein puncture. Two sets of measurements are taken with the use for each set of measurements of a various, yet known underpressure generated at the outlet end of the capillary by connecting to evacuated test tubes with the required inside pressure; the reference blood distances covered in the capillary at the successive moments of time equal for both sets of measurements are processed according to formula $$\eta =\frac{R^2}{4}\left({\left(p_{\exp }\right)}_1-{\left(p_{\exp }\right)}_2\right)\cdot \frac{t_i}{{\left(l^2\left(t_i\right)\right)}_2-{\left(l^2\left(t_i\right)\right)}_1},$$ wherein η is the blood viscosity factor, R is an inner capillary radius, (p_exp ) ₁ is the pressure in the first evacuated test tube for the first set of measurements, (p_exp)₂ is the pressure in the second evacuated test tube for the second set of measurements, t_i are the moments of time (the same for both sets of measurements) when the blood flows in the capillary, whereat the blood distance is measured, (l²(t_i))₁ is the squared blood distances covered in the capillary by the moments of time t_i in the first set of measurements, (l²(t_i))₂ is the squared blood distances covered in the capillary by the moments of time t_i in the second set of measurements.

EFFECT: higher accuracy and reduced time for measuring, as well as its simplification.

4 cl, 1 dwg