Wearable Motion Sensor Wearing Status Detection via Respiration Correlation
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Solution Overview
Problem
Existing wearable motion sensors often provide inaccurate activity monitoring when detached from the user, leading to incorrect health assessments due to independent sensor signals lacking plausibility checks, which can result in misclassification of activities and incorrect health state conclusions.
Innovation Solution
A system and method that determines the wearing status of a wearable motion sensor by correlating motion signals with respiration signals, using spectral analysis and correlation techniques to ensure accurate detection of sensor attachment, and adapts processing based on the wearing status to provide reliable health and activity metrics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the telemetry device is taken off the user's body and placed on a nightstand or IV-pole, then the device can remain close to the user, but the device no longer follows the user's motion accurately leading to misclassification of activities
Solution Approach 1:
The patent introduces an intermediary verification mechanism using a second sensor signal (such as respiration, heart rate, or skin conductance) to mediate between the motion sensor data and the final activity classification. This intermediary check allows the system to distinguish between genuine user activity and artifact motion from off-body device placement, resolving the contradiction between convenient device placement and accurate activity detection
2Adaptability or versatility
If the device is hung on an IV-pole and the user walks with it, then the device remains accessible, but the device does not make walking motions leading to incorrect sedentary classification
Solution Approach 1:
The patent implements feedback by continuously monitoring secondary physiological parameters (respiration, heart rate, skin conductance) that provide real-time verification of whether the device is being worn. This feedback loop allows the system to adjust its interpretation of motion data dynamically, maintaining reliability even when the device is used in flexible configurations like hanging on an IV-pole
3Device complexity
If only motion sensor data is used to determine activity, then the system is simple, but the system produces unreliable health assessments when the device is not worn
Solution Approach 1:
The patent merges multiple sensor types (motion sensors with secondary physiological sensors) into a unified monitoring system. By combining data from different sensor modalities, the system achieves robust activity detection that remains accurate whether the device is worn or not, resolving the contradiction between system simplicity and assessment accuracy
Data Source
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AI summary
The present invention relates to a device, system and method for determining a wearing status of a wearable motion sensor to be worn by a user. The device comprises a sensor input configured to obtain a motion signal from the wearable motion sensor and a respiration signal from a respiration sensor; a processor configured to determine a correlation between the motion signal and the respiration signal for one or more time periods, and to determine a wearing status of the wearable motion sensor for the one or more time periods based on the determined correlation, and an output configured to output the wearing status.