Hydration State Indicator Using Semi-Permeable Membrane
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Solution Overview
Problem
Current methods for assessing hydration state, such as osmotic sensors, are invasive, costly, and not suitable for prolonged monitoring outside a clinical setting, as they require fluid samples and have limited operational lifetimes due to complex structures and electronic components.
Innovation Solution
A hydration state indicator with a watertight shell, semi-permeable membrane, and water-absorbent indicator layer that changes volume with water content, providing visual or electrical outputs, allowing for non-invasive, cost-effective, and prolonged monitoring of hydration state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a rigid structure is used for pressure sensing, then measurement precision is improved, but ease of operation deteriorates due to difficulty in achieving good seal against skin
Solution Approach 1:
The patent replaces the rigid pressure-sensing structure with a flexible membrane that can conform to the skin surface, achieving both good sealing and functional performance. The flexible membrane allows the device to adapt to skin contours while maintaining osmotic pressure sensing capability through volume changes.
2Measurement precision
If electronic components are used for readout, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent replaces electronic pressure transducers with a passive optical detection system. The osmotic pressure information is encoded in the volume changes of the membrane-bound reference chamber, which can be detected optically without requiring electronic components, thereby simplifying the device structure.
Solution Approach 2:
The patent creates a simplified model system - a membrane-bound reference chamber that replicates the osmotic behavior of biological cells. This model chamber provides a visual or optical copy of the osmotic state information without requiring complex electronic measurement systems.
3Measurement precision
If a semi-permeable membrane is used for osmotic sensing, then measurement precision is improved, but reliability deteriorates due to membrane failure after limited exposure time
Solution Approach 1:
The patent designs the device as a disposable unit with a limited-life membrane, optimized for short-term monitoring applications. The membrane is engineered to provide sufficient operational lifetime for the intended use case (e.g., acute monitoring), after which the entire device is discarded, eliminating the need for long-term durability.
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 continuous, non-invasive monitoring of hydration state, providing clear visual or electrical cues for dehydration or fluid overload, suitable for widespread use and extended periods, improving safety by detecting deviations from normal osmotic balance.
Implementation Method 1
a semi-permeable membrane configured to permit the passage of water molecules and to block the passage of molecules of at least one solute
Implementation Method 2
a water-absorbent indicator layer enclosed by the shell and the membrane; The volume of at least one part of the indicator layer is variable in dependence on the water content of the indicator layer
Data Source
AI summary
There is provided a hydration state indicator. The hydration state indicator comprises a watertight shell; a semi-permeable membrane configured to permit the passage of water molecules and to block the passage of molecules of at least one solute; a water-absorbent indicator layer enclosed by the shell and the membrane; and output means configured to provide an output. The water-absorbent indicator layer has a predetermined osmotic strength. The volume of at least one part of the indicator layer is variable in dependence on the water content of the indicator layer. The output is variable in dependence on the volume of the at least one part of the indicator layer.