DEVICE FOR INTERACTIVE ASSESSMENT OF HUMAN CARDIOVASCULAR STATUS BASED ON DISTANT PHOTOPLETHYSMOGRAPHY Russian patent published in 2021 - IPC A61B5/295 A61B5/1455 H04L5/14 H04L27/20 H04L27/22 H04L27/28 

FIELD: medicine.

SUBSTANCE: invention relates to medical equipment. Device for interactive evaluation of human cardiovascular system based on distant photoplethysmography (PPG) comprises an optoelectronic detector of a pulse wave of blood flow in a finger of a patient with two light-emitting diodes and a photodiode connected to an operational amplifier, an analog-to-digital converter (ADC) and an electronic unit for processing an electrical signal, as well as a computer-equipped control panel. Housing of the detector is designed so that to enable attachment on a phalanx of a patient's finger. Control panel is supplemented with radio transmitter operating at frequency ω₁, and tuned to frequency radio receiver ω₂. In housing of optoelectronic detector there arranged is miniature radio receiver tuned to frequency ω₁, and a miniature radio transmitter operating at frequency ω₂. Radio transmitter on the control panel is in form of a phase manipulator, a carrier frequency generator, a power amplifier and a transmitting antenna connected in series to the output of the personal computer. Miniature radio receiver in optoelectronic detector housing is made in form of series-connected receiving antenna, high-frequency amplifier, first multiplier, low-pass filter, narrow-band filter, second multiplier, high-frequency amplifier, low-pass filter and low-frequency amplifier. Miniature radio transmitter in the housing of the optoelectronic detector is in form of a series-connected to the output ADC phase manipulator, a carrier frequency generator, a power amplifier and a transmitting antenna. Radio receiver on control panel is made in form of series-connected receiving antenna, high-frequency amplifier, first multiplier, low-pass filter, narrow-band filter, a second multiplier, a high-frequency amplifier, a low-pass filter and a low-frequency amplifier, the output of which is connected to the input of an electrical signal processing unit which is part of a personal computer of the control panel.

EFFECT: higher reliability and reliability of PPG research by using duplex radio communication between control panel and optoelectronic detector using two frequencies and complex signals with phase manipulation.

1 cl, 4 dwg, 1 tbl