SYSTEM AND METHOD FOR NON-CUFF DETERMINATION OF BLOOD PRESSURE Russian patent published in 2021 - IPC A61B5/28 A61B5/295 

FIELD: medicine; diagnostics.

SUBSTANCE: electrocardiogram (hereinafter – ECG) of a user is obtained. ECG is processed, and at least one R-peak is determined. ECG processing includes the processing of cardiocycles to reduce artificial distortions of a typical cardiocycle by performing following steps. An ECG signal is filtered with a digital filter. Localization of R-teeth is carried out by the Pan-Tompkins algorithm. A time window corresponding to the cardiocycle is cut out, and the cardiocycle is centered relatively to the average cardiocycle to align an isoelectric line of the electrocardio-signal without losing information about amplitude parameters of the cardiocycle. A temporary averaged cardiocycle is built by an ensemble of all cardiocycles. Self-similarity of all cardiocycles is monitored by comparing them with the temporary averaged cardiocycle, and, if a discrepancy is detected, the current cardiocycle is removed from the averaging sample. Then, averaging is carried out by the ensemble of cardiocycles that have passed the control, forming an averaged cardiocycle consisting of quality-acceptable cardiocycles that have not been subjected to additional distortions. A photoplethysmogram (hereinafter – PPG) of a user is obtained, and PPG is processed. At the same time, PPG data is filtered. A PPG wave is split into pulse waves using wavelet transform that uses visual signs, while elementary waves hidden in the PPG wave give bursts on the wavelet transform of the initial PPG. Marking of at least one pulse wave is carried out. At least one pulse wave model is built. At least one PPG feature is extracted. After that, at least one R-peak and at least one PPG feature are transferred to a regression model, and blood pressure is determined.

EFFECT: method allows one to increase the accuracy of the non-cuff determination of blood pressure by obtaining and processing an electrocardiogram, as well as by obtaining and processing a photoplethysmogram (PPG).

16 cl, 19 dwg