METHOD AND DEVICE FOR MEASURING HEART RATE WITH SUPPRESSION OF MOTION ARTIFACTS Russian patent published in 2022 - IPC A61B5/245 A61B5/295 A61B5/1455 

FIELD: heart rate measurement.

SUBSTANCE: group of inventions relates to methods and devices for measuring heart rate, as well as to wearable heart rate measuring devices containing such measuring devices. The heart rate measuring device contains a light source, photodetectors, a conversion unit and a computing unit. The photodetectors in each pair of photodetectors are connected counter-parallel. The light source and photodetectors form a balanced optical circuit. The conversion unit contains a transimpedance amplifier (TIA) and an ADC. At the same time, a part of the body is illuminated with coherent light. The light scattered by the tissues of the body area and blood particles is detected. The frequency component of motion artifacts in the analog difference signal of the photocurrent is eliminated by subtracting the analog signal of the photocurrent detected by one photodetector from a pair of photodetectors from the analog signal of the photocurrent detected by another photodetector from a pair of photodetectors. The analog difference signal of the photocurrent is converted by TIA into an analog voltage difference signal. An analog voltage difference signal is converted by ADC into a digital difference signal. The envelope of the digital difference signal is computed. The heart rate is calculated from the peaks of the calculated envelope of the digital difference signal.

EFFECT: present invention enables to simplify the design and reduce the size of the device, which does not require rigid fixation on the human body, is achieved due to the absence of sensors measuring the movement of the measuring device relative to the part of the body on which it is fixed, which also simplifies signal processing, since there is no need to process motion sensor signals to eliminate motion artifacts. The present invention enables to calculate the heart rate.

11 cl, 13 dwg