Bio-signal Measurement Substrate Segmentation for Force Isolation
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Solution Overview
Problem
Current wearable medical devices for measuring cardiovascular health, such as blood pressure, face challenges in accurately and efficiently capturing bio-signals and force data without interference, limiting their precision and user experience.
Innovation Solution
A bio-signal measurement apparatus comprising substrates at the same level, with an optical sensor and force sensor configuration, and a separation structure to prevent force transmission, allowing for simultaneous contact and accurate measurement of pulse wave signals and applied force, using a processor to estimate blood pressure based on measured data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If substrates are stacked to measure multiple bio-signals, then measurement functionality is improved, but force transmission between substrates interferes with measurement accuracy
Solution Approach 1:
The patent divides the substrate into multiple independent measurement layers (first substrate and second substrate) stacked in the thickness direction. Each substrate independently measures different bio-signals (optical sensor for pulse wave, force sensor for contact force). The separation structure physically segments the force transmission path, allowing each layer to function independently without mutual interference.
Solution Approach 2:
The separation structure acts as an intermediary element positioned between the first substrate and second substrate. It selectively transmits optical signals while blocking force transmission. This mediator allows the optical sensor in the first substrate to function without interference from force applied to the second substrate, resolving the measurement accuracy problem.
2Adaptability or versatility
If optical sensor and force sensor are integrated in stacked substrates, then comprehensive bio-signal measurement is improved, but force transmission causes measurement interference
Solution Approach 1:
The patent segments the sensing system into distinct functional layers: the first substrate contains the optical sensor for pulse wave measurement, while the second substrate contains the force sensor for contact force measurement. This spatial segmentation ensures that force applied to the second substrate does not transmit to the first substrate, maintaining measurement reliability for both sensors simultaneously.
Solution Approach 2:
The separation structure serves as a selective mediator that blocks mechanical force transmission between substrates while allowing optical signals to pass through. This ensures that the optical sensor measurements are not contaminated by force variations, and the force sensor measurements are not affected by optical measurement processes, thereby maintaining high measurement reliability.
3Productivity
If multiple substrates are stacked for simultaneous measurement, then measurement efficiency is improved, but force transmission between substrates creates measurement error
Solution Approach 1:
The patent implements a segmented multi-substrate architecture where the first substrate and second substrate are stacked but mechanically decoupled through the separation structure. This allows simultaneous independent measurement of pulse wave and contact force without force transmission errors, maintaining both measurement efficiency and accuracy.
Solution Approach 2:
The separation structure acts as a force-blocking intermediary between the stacked substrates. It enables the system to efficiently measure multiple bio-signals simultaneously by preventing force transmission from the second substrate to the first substrate, thereby eliminating measurement errors while maintaining high measurement efficiency.
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 configuration enhances the accuracy of blood pressure measurement by calculating contact pressure and analyzing pulse wave changes, improving user experience and measurement precision.
Implementation Method 1
an optical sensor provided in the first substrate... configured to emit a light
Implementation Method 2
measure a pulse wave signal of a user, by using the optical sensor
Implementation Method 3
a force sensor provided below the optical sensor... measure the force applied to the first substrate by the user
Data Source
AI summary
A bio-signal measurement apparatus may include a first substrate and a second substrate, an optical sensor mounted in the first substrate, a force sensor disposed on or below the first substrate, and a separation structure interposed between the first substrate and the second substrate so as to prevent transmission of a force between the first substrate and the second substrate. An upper surface of the first substrate and an upper surface of the second substrate may be provided at the same level.