Multi-Wearable PPG Blood Pressure Measurement with PWV Correction
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Solution Overview
Problem
Existing methods for measuring blood pressure using wearable devices are inconvenient and may not provide precise results due to changes in a user's blood vessel state over time, necessitating periodic recalibration with a blood pressure monitor.
Innovation Solution
A method involving multiple wearable devices that cooperate to measure blood pressure by calculating a correction value using pulse wave analysis (PWA) based on photoplethysmogram (PPG) signals, determining pulse wave velocity (PWV), and obtaining vascular characteristics to correct the measured blood pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If blood pressure is measured using a single wearable device with PPG signal, then the measurement can be performed continuously and conveniently, but the measurement precision deteriorates due to changes in blood vessel state over time
Solution Approach 1:
The patent combines data from multiple wearable devices worn at different body positions to perform collaborative blood pressure measurement. By merging PPG signals from multiple devices and using pulse wave analysis, the system achieves both continuous convenient monitoring and improved measurement precision through multi-point vascular characteristic assessment
Solution Approach 2:
The patent uses pulse wave velocity (PWV) as a key parameter that changes with blood vessel state. By calculating PWV from PPG signals and using it to determine vascular characteristics, the system adapts to changes in blood vessel state over time, thereby maintaining measurement precision without requiring frequent recalibration
2Measurement precision
If blood pressure measurement is performed using multiple wearable devices collaboratively, then the measurement precision is improved through vascular characteristic analysis, but the device complexity increases
Solution Approach 1:
The patent makes each wearable device multi-functional by enabling it to not only perform its primary function but also to contribute PPG signals for collaborative blood pressure measurement. The central electronic device coordinates multiple devices and performs comprehensive analysis, allowing the system to achieve high precision without requiring each individual device to be overly complex
3Measurement precision
If periodic recalibration with blood pressure monitor is performed to correct PPG-based blood pressure, then the measurement precision is improved, but the ease of operation deteriorates due to frequent manual intervention
Solution Approach 1:
The patent implements self-service by enabling the system to automatically perform recalibration using data from multiple wearable devices without requiring manual intervention with a traditional blood pressure monitor. The collaborative measurement system continuously updates vascular characteristics and corrects blood pressure readings automatically, maintaining precision while preserving user convenience
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 approach allows for more precise blood pressure measurement without the need for frequent recalibration, enhancing user convenience and accuracy.
Implementation Method 1
an electronic device (e.g., a wearable device) may obtain a photoplethysmogram (PPG) signal through an optical sensor (e.g., a photoplethysmogram (PPG) sensor)
Data Source
AI summary
An electronic device according to an embodiment may include communication circuitry and at least one processor. The at least one processor may be configured to receive a first PPG signal obtained by a first wearable device from the first wearable device via the communication circuitry and receive a second PPG signal from a second wearable device. The first wearable device may be worn on a first position of a user and the second wearable device may be worn on a second position of the user. The at least one processor may be configured to obtain a pulse transit time (PTT) taken for a pulse wave to be transferred from the first position to the second position, based on the first PPG signal and the second PPG signal. The at least one processor may be configured to obtain a distance between the first wearable device and the second wearable device. The at least one processor may be configured to obtain a pulse wave velocity (PWV) at which the pulse wave is transferred, based on the distance and the PTT. The at least one processor may be configured to obtain a first blood pressure by using a pulse wave analysis (PWA) method, based on the first PPG signal and/or the second PPG signal. The at least one processor may be configured to obtain a vascular characteristic value related to a characteristic of a blood vessel, based on the PWV and the first blood pressure. The at least one processor may be configured to obtain a blood pressure correction value for correcting a second blood pressure to be obtained, based on the vascular characteristic value.