METHOD AND DEVICE FOR MEASURING BLOOD CIRCULATION VELOCITY Russian patent published in 2005 - IPC

FIELD: medicine; medical engineering.

SUBSTANCE: method involves applying ultrasonic Doppler echolocation techniques for scanning blood circulation at selected area of cardiovascular system, determining blood circulation velocity vector projections and calculating blood circulation speed. Echolocation is carried out by using at least three non-complanar probing ultrasonic rays set at angles relative to selected area of cardiovascular system in the range of 0-±80°. Selected blood circulation area orientation angles are measured relative to scanning ultrasonic rays and Doppler frequency shifts in each measuring channel are determined. Blood circulation speed is calculated as where ω_0i is the radiation frequency of ultrasonic oscillation in ray I, Δω_i is the Doppler frequency shifts in measuring channel i, V is the ultrasonic wave propagation speed in the medium, ϑ_k is the blood circulation speed in selected area, ϑ_ki is the blood circulation velocity projection to scanning ray i, a,b,c,h,k,n₁₁,n₁₂,n₁₃ are the coefficients depending on ultrasonic rays orientation. The device has measuring unit having ultrasonic transducers and electronic unit having switch, high frequency oscillator, calculating unit, indication and control unit. The measuring unit is manufactured as bracelet which segments are connected to each other by means of adjustable hinges and has gages for measuring lateral segment orientation angles relative to the central segment and gages for measuring ultrasonic transducer orientation angles relative to the i-th segment where i = 1,2,3, connected to calculating unit, switch, indication and control unit connected to high frequency oscillator, ultrasonic transducers of the measuring unit are connected via the switch to the high frequency oscillator.

EFFECT: high accuracy of measurements; wide range of functional applications.

2 cl, 2 dwg