Sleep-Stage Blood Pressure Sensing With Motion-Gated Measurement
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Solution Overview
Problem
Existing electronic devices face challenges in accurately measuring nighttime blood pressure due to user movement and sleep disturbances, leading to increased power consumption and unreliable data acquisition.
Innovation Solution
An electronic device equipped with sensors to detect movement and sleep stages, allowing for precise acquisition of biometric information during designated sleep periods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If continuous blood pressure measurement is performed during sleep, then nighttime blood pressure data can be acquired, but power consumption increases
Solution Approach 1:
The patent implements periodic measurement cycles with multiple phases: initial blood pressure measurement, sleep stage determination, movement detection, and conditional subsequent measurements. The system periodically checks sleep continuity and movement conditions before acquiring blood pressure data, rather than continuously measuring without interruption. This periodic approach with strategic measurement points reduces overall power consumption while ensuring adequate nighttime blood pressure data collection.
Solution Approach 2:
The system performs preliminary actions before blood pressure measurement including determining sleep stage, detecting movement, and verifying sleep continuity. These preliminary checks are conducted first to determine whether subsequent blood pressure measurement should proceed, preventing unnecessary power consumption from measurements taken during inappropriate conditions such as movement or non-sleep states.
2Reliability
If blood pressure measurement is performed during sleep, then nighttime blood pressure data can be acquired, but user sleep is disturbed
Solution Approach 1:
The system uses periodic measurement cycles with strategic timing, conducting blood pressure measurements only at appropriate intervals during confirmed sleep periods. By checking sleep stage and movement conditions periodically before each measurement, the system minimizes the frequency and timing of measurements that could disturb sleep, while still accumulating sufficient nighttime blood pressure data over the measurement period.
Solution Approach 2:
The system performs preliminary verification of sleep continuity and absence of movement before initiating blood pressure measurement. This preliminary check ensures measurements are taken only when the user is in a stable sleep state, avoiding disturbances that would occur during movement or transitions. The system determines sleep stage and checks movement conditions first, then proceeds with measurement only if conditions are appropriate.
3Productivity
If blood pressure measurement is performed during movement, then measurement coverage is increased, but measurement accuracy decreases
Solution Approach 1:
The system performs preliminary movement detection using acceleration sensors before conducting blood pressure measurement. By checking for movement artifacts and determining movement state first, the system can identify and exclude measurements taken during movement, ensuring that only measurements from stable conditions are used for nighttime blood pressure data, thus maintaining high measurement accuracy.
Solution Approach 2:
The system uses feedback from movement detection and sleep stage determination to control subsequent blood pressure measurement timing. When movement is detected or sleep stage changes occur, the system adjusts measurement timing accordingly, pausing or canceling measurements during inappropriate conditions. This feedback mechanism ensures measurement accuracy by preventing measurements during movement while maintaining adequate measurement coverage over time.
4Measurement precision
If multiple sensors are used to detect sleep stage and movement, then measurement accuracy is improved, but device complexity increases
Solution Approach 1:
The patent employs sensors with multiple functions: acceleration sensors serve both as motion detectors for movement detection and as inputs for sleep stage determination algorithms. The optical sensors used for blood pressure measurement also contribute to sleep stage analysis through photoplethysmogram signal analysis. This multi-functionality approach improves measurement precision through multiple data sources while minimizing device complexity by avoiding dedicated separate sensors for each function.
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
Enables accurate measurement of nighttime blood pressure by filtering data based on user stability and sleep stage, reducing power consumption and improving data reliability.
Implementation Method 1
a first sensor configured to detect a movement of the electronic device
Implementation Method 2
a second sensor configured to measure a biosignal of a user wearing the electronic device
Data Source
AI summary
An electronic device is provided including a first and second sensors, memory storing instructions, and at least one processor. The instructions, when executed by the at least one processor, cause the electronic device to, based on identifying that a user is in a sleep state, detect a movement of the electronic device via the first sensor, based on a magnitude of the movement being less than or equal to a threshold, acquire, based on a biosignal acquired via the second sensor, biometric information of the user, acquire a time period corresponding to a designated sleep stage among sleep stages of the sleep state, and identifying, among the acquired biometric information, biometric information acquired during a third time period, the third time period being an overlapping time period between a first time period during which the biometric information is acquired and a second time period corresponding to the designated sleep stage.