Multi-Wavelength Pulse Wave Sensor for Bio-Information Estimation
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Solution Overview
Problem
The aging of body tissues and long-term exposure to high glucose concentrations lead to glycated proteins in blood vessels, reducing elasticity and increasing cardiovascular disease risk, for which existing methods lack effective non-invasive and accurate estimation techniques.
Innovation Solution
A bio-information estimating apparatus and method using a pulse wave sensor that measures multi-wavelength pulse wave signals at different pressures to calculate intensity ratios and apply predefined functions, such as logarithmic or linear combinations, to estimate bio-information like skin tissue aging and biological age, guiding users through varying contact pressures to obtain accurate measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multi-wavelength pulse wave signals are measured at different pressures, then measurement precision of bio-information is improved, but device complexity increases due to requiring pressure control mechanisms and multiple wavelength detection
Solution Approach 1:
The patent segments the measurement process into multiple discrete pressure levels (first pressure and second pressure), where the sensor part measures pulse wave signals at each pressure level separately. This segmentation allows accurate comparison of signal changes across pressures while keeping each individual measurement simple and manageable, resolving the contradiction between measurement precision and device complexity.
Solution Approach 2:
The patent changes the pressure parameter applied to the sensor part between measurements, comparing pulse wave signals at different pressure levels. By varying this physical parameter (pressure) rather than increasing sensor complexity, the system achieves more accurate bio-information estimation through pressure-dependent signal analysis without requiring complex multi-sensor arrays.
2Ease of operation
If contact pressure guidance is provided to users, then ease of operation is improved, but loss of time increases due to additional guidance steps and user instructions
Solution Approach 1:
The processor provides contact pressure guidance to users before and during the measurement process, instructing users on how to apply appropriate pressure to the sensor part. This preliminary guidance ensures users understand the correct operation, reducing measurement errors and the need for retries, thereby improving ease of operation while minimizing time loss through clear, concise instructions.
Solution Approach 2:
The system provides feedback to users regarding contact pressure through the processor, guiding users to adjust their pressure application based on real-time or pre-established criteria. This feedback mechanism helps users achieve optimal measurement conditions more quickly, improving ease of operation without significantly extending the measurement time.
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 non-invasive estimation of skin tissue aging and biological age by analyzing changes in multi-wavelength pulse wave signals under different pressures, providing a reliable prediction of cardiovascular disease risk and guiding users in maintaining optimal contact pressures for accurate readings.
Implementation Method 1
a detector configured to detector light scattered or reflected from the object
Implementation Method 2
a detector configured to detector light scattered or reflected from the object
Implementation Method 3
a light source configured to emit light of multiple wavelengths onto the object
Data Source
AI summary
An apparatus for estimating bio-information based on pulse wave signals of multiple wavelengths is disclosed. The bio-information estimating apparatus may include: a sensor part comprising a pulse wave sensor configured to measure a multi-wavelength pulse wave signal at a first point in time when a first pressure is applied from an object to the sensor part and at a second point in time when a second pressure is applied from the object to the sensor part; and a processor configured to estimate bio-information based on a difference between the multi-wavelength pulse wave signal measured at the first pressure and the multi-wavelength pulse wave signal measured at the second pressure.