Blood Pressure Estimation via Acceleration Pulse Wave Differentiation
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Solution Overview
Problem
Existing blood pressure estimation methods using pulse wave measurement have low accuracy due to the lack of correlation between pulse rate and blood pressure, making it difficult to estimate blood pressure information with high precision.
Innovation Solution
A blood pressure estimation method that involves acquiring a photoplethysmographic signal from a peripheral blood vessel using a photoplethysmographic sensor, calculating a peripheral blood pressure index based on the steepness of the signal, and estimating blood pressure using the de time, a peak time difference between the d and e waves in an acceleration pulse wave signal obtained through second-order differentiation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If pulse rate is used to estimate blood pressure, then the measurement is simple and non-invasive, but the estimation accuracy is low due to weak correlation between pulse rate and blood pressure
Solution Approach 1:
The patent transforms the photoplethysmographic signal through mathematical operations (first-order differentiation to obtain velocity pulse wave, second-order differentiation to obtain acceleration pulse wave) to extract new parameters (rise time, peak time, area) that have stronger correlation with blood pressure than the original pulse rate
Solution Approach 2:
The patent introduces intermediate parameters (rise time, peak time, area of velocity and acceleration pulse waves) as mediators between the photoplethysmographic signal and blood pressure estimation, creating a more accurate estimation model
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This method provides a non-invasive means to estimate blood pressure with high accuracy by utilizing the strong correlation between the peripheral blood pressure index and de time with actual blood pressure values.
Implementation Method 1
acquiring a photoplethysmographic signal of a blood vessel of a periphery of a subject with a photoplethysmographic sensor
Data Source
AI summary
A blood pressure estimation method and a biological information measurement system for accurately estimating blood pressure information of a user in a non-invasive manner. A biological information measurement system executes acquiring a photoplethysmographic signal of a blood vessel of a periphery of a user who is a subject by a photoplethysmographic sensor, calculating a peripheral blood pressure index that is an index of a magnitude of a blood pressure of a capillary or an arteriole of the periphery based on a steepness of rising of the photoplethysmographic signal, and estimating a magnitude of a blood pressure of the user by using a de time and the peripheral blood pressure index. The de time is a peak time difference between a d wave and an e wave in an acceleration pulse wave signal obtained by performing second-order differentiation on the photoplethysmographic signal.