DEVICE FOR MEASURING SKIN BLOOD FLOW Russian patent published in 2016 - IPC A61B5/26 

FIELD: medicine.

SUBSTANCE: invention refers to medical equipment and is intended for measuring skin blood flow on the basis of the method of laser Doppler flowmetry. Device comprises primary source of laser radiation, primary radiation transportation system, secondary radiation receiving system and two channels of the signal electronic processing. Primary radiation transportation system comprises two optical fibers and a model simulating the optical properties of living biological tissue without blood. Secondary radiation receiving system comprises two optical fibers. Circuit of each channel comprises serially connected photodetector, filter of high frequencies, amplifier and an analog divider. Signal processing circuit on each channel additionally includes a low pass filter with a cutoff frequency of 2 Hz, connected in parallel with the photodetector and the second input of analog divider. Device also includes a differential amplifier, inputs of which are connected to analog outputs of the two channels dividers, and the output - with the scheme for calculating the index of perfusion.

EFFECT: improved accuracy of received frequency microcirculation rhythms is achieved due to a removal from signal of spurious spectra in differential stage and elimination of subtraction of in-phase correlated useful signals at differential amplifier.

1 cl, 7 dwg