METHOD FOR MEASURING BLOOD VISCOSITY IN VEIN PUNCTURE Russian patent published in 2014 - IPC A61B5/22 G01N11/00 

FIELD: medicine.

SUBSTANCE: medical needle connected to a vacuum test tube is inserted into a blood vessel for measuring blood viscosity in the process of blood sampling from the blood vessel for blood analysis. A blood sampling procedure involves fast periodic vibrations generated at the needle entry inside the vein by multiple partial blood vessel compression by means of a vibrator and a low-frequency acoustic emitting device. That provides generating a time-version oscillating blood flow through the needle and a phase shift between the fast periodic pressure vibrations and pulsation of at least one of three parameters: the blood outflow rate from the needle into the vacuum test tube, the blood level in the vacuum test tube, and gas pressure in an empty portion of the vacuum test tube. The measuring procedure is performed by means of a low-frequency acoustic sensor connected to a phase indicator or a beam oscillograph. The measured frequency-related phase shifts are used to calculate blood viscocity.

EFFECT: accurate measurement of blood viscosity combined with reduced measuring time by an objective evaluation of actual blood viscosity using no additional information describing the blood flow volume and the tube length.

6 cl, 1 dwg