Wearable Hydration Monitoring via Multi-Wavelength Optical Sensing
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Solution Overview
Problem
Existing methods for monitoring hydration levels in humans, such as smartwatches and wearable devices, fail to accurately compare liquid intake and loss, provide individualized recommendations based on physical activity and physiological characteristics, and do not monitor the effectiveness of these recommendations.
Innovation Solution
A method and device that utilize sensors on a smartwatch or similar wearable to estimate net water intake and loss, calculate daily water requirements based on individual data, and provide personalized recommendations for optimal water intake, including warnings for dehydration or overhydration, by using machine learning algorithms and data from inertial, optical, and temperature sensors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional methods (isotope dilution, urine/saliva testing, skin turgor observation) are used to estimate hydration, then measurement precision is improved, but ease of operation deteriorates and device complexity increases
Solution Approach 1:
The patent replaces complex laboratory-based mechanical/chemical measurement systems (isotope dilution, urine analysis) with optical sensing technology. The sensor system uses light absorption measurements at multiple wavelengths to detect hydration levels, eliminating the need for complex lab equipment and procedures while maintaining measurement accuracy and enabling portable, user-friendly operation.
2Measurement precision
If electromagnetic radiation transmission method is used to assess hydration, then measurement precision is improved, but individual recommendations are not provided
Solution Approach 1:
The patent implements a feedback mechanism where the sensor system not only measures hydration levels with high precision but also processes this data to generate and provide personalized recommendations to users. The system continuously monitors hydration status and delivers actionable guidance tailored to individual needs, closing the loop between measurement and practical application.
3Ease of operation
If galvanic skin response measurements are used for hydration monitoring, then ease of operation is improved, but individual recommendations are not provided and monitoring completeness deteriorates
Solution Approach 1:
The patent creates a multi-functional sensor system that performs multiple hydration assessment functions simultaneously. The device combines galvanic skin response measurement with optical sensing and other detection methods to provide comprehensive hydration monitoring while maintaining ease of operation. This universal approach allows the single wearable device to deliver complete hydration information and personalized recommendations.
4Measurement precision
If optical radiation transmission through body part is used, then measurement precision is improved, but adaptability to different user conditions deteriorates
Solution Approach 1:
The patent employs parameter changes by measuring light absorption at multiple different wavelengths rather than a single wavelength. This multi-wavelength approach allows the system to compensate for variations in individual user characteristics such as skin tone, tissue composition, and anatomical differences. By analyzing absorption patterns across the spectrum, the system adapts to different users while maintaining high measurement precision.
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 solution provides accurate and timely individualized recommendations for water intake, preventing dehydration and overhydration, and is independent of user action, offering continuous monitoring and updating of hydration balance without restricting daily activities.
Implementation Method 1
The output intensities and absorption coefficients of radiation by the human body are measured for each of these wavelengths. The slope of the absorption curve described by the Beer-Lambert law depends on the relative water content in the human body part where the measurement is made.
Implementation Method 2
The slope of the absorption curve described by the Beer-Lambert law depends on the relative water content in the human body part where the measurement is made.
Implementation Method 3
Another method described in U.S. Pat. application pub. no. 2016/374588 A1 is related to monitoring body hydration levels based on galvanic skin response measurements acquired by a wearable electronic device.
Data Source
AI summary
A method for monitoring hydration of a living body of a user includes: obtaining an individual physiological data of the user; obtaining a sensor data associated with the living body of the user; determining, based on the sensor data, an estimated net amount of water intake of the living body and an estimated physical activity level of the living body; calculating daily water requirements for the living body based on the individual physiological data and the estimated physical activity level; comparing the calculated daily water requirements for the living body with the estimated net amount of the water intake of the living body; and providing at least one individual recommendation based on a result of the comparing, the at least one individual recommendation being associated with a recommended amount of water for the user to take.