Neckband Pulse Transit Measurement With Posture Compensation
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Solution Overview
Problem
Existing pulse wave transit time measurement technologies suffer from measurement instability due to changes in user posture, leading to errors and inconsistent results, particularly when measuring over extended periods like during sleep.
Innovation Solution
A pulse wave transit time measurement device with an electrocardiographic electrode and pulse wave sensor positioned at the neck's midline, combined with a posture detection system, to stabilize measurements by reducing posture-related fluctuations and enabling continuous, accurate calculations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If pulse wave measurement is performed using conventional methods, then measurement can be conducted, but measurement stability deteriorates when user posture changes
Solution Approach 1:
The patent applies parameter changes by utilizing acceleration sensor data to detect posture changes and dynamically adjusting or compensating for these changes in the pulse wave transit time calculation. This allows the system to maintain measurement stability despite variations in user posture during continuous monitoring.
2Duration of action of moving object
If continuous measurement over extended periods is performed, then more data is obtained, but measurement accuracy deteriorates due to posture changes
Solution Approach 1:
The system implements feedback by continuously monitoring acceleration sensor data to detect posture changes, then using this information to compensate for their effects on pulse wave transit time measurements. This feedback mechanism enables accurate continuous measurement over extended periods despite posture variations.
3Device complexity
If measurement is performed without posture compensation, then device complexity is reduced, but measurement reliability deteriorates
Solution Approach 1:
The patent applies universality by integrating multi-functional capabilities into the wearable device: the acceleration sensor serves both for basic motion tracking and for posture-based compensation of pulse wave measurements. This multi-functionality approach maintains measurement reliability without significantly increasing device complexity.
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
The device ensures stable and continuous measurement of pulse wave transit time even with changes in posture, enhancing the accuracy of blood pressure estimation by correcting for posture-related variations.
Implementation Method 1
an R wave peak timing of an electrocardiographic wave detected by an electrocardiographic electrode
Implementation Method 2
a pulse wave signal detected by a pulse wave sensor positioned in contact with a neck of the user
Data Source
AI summary
A pulse wave transit time measurement device includes a neck band, a pair of electrocardiographic electrodes detecting an electrocardiographic signal, a photoplethysmographic sensor detecting a pulse wave signal, and a pulse wave transit time calculator calculating a pulse wave transit time based on a peak time difference between the electrocardiographic signal detected by the electrocardiographic electrodes and the pulse wave signal detected by the photoplethysmographic sensor. The photoplethysmographic sensor is positioned in or substantially in a central region of the neck band at a location at which the photoplethysmographic sensor is in contact with a neck of a user at or near a midline of the neck on the backside when the neck band is worn around the neck of the user.