Textile Electrode Humidification via Porous Hydrogel and Permeable Barrier
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Solution Overview
Problem
Textile electrodes used for physiological measurements face challenges due to higher impedance compared to conventional electrodes, requiring adequate moisture for ionic conduction, which is often not maintained by perspiration alone, leading to inconsistent signal detection and limited long-term measurement capabilities.
Innovation Solution
A device with a first impermeable layer and a second permeable layer that controls water vapor transmission to maintain optimal moisture levels between the textile electrode and skin, allowing for continuous humidification and preventing evaporation, integrated into clothing for passive recharging during washing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a moisture retainer (sponge) is placed between the conductive layer and base layer to absorb and store liquid, then the moisture level between the electrode and skin is increased to improve conductivity, but the moisture level is not perfectly controlled and water may be released in liquid form heterogeneously, affecting measurement quality
Solution Approach 1:
The patent employs a porous hydrogel layer as the moisture retainer between the conductive layer and base layer. The hydrogel's porous structure enables controlled water absorption and retention, releasing moisture uniformly through capillary action rather than heterogeneous liquid release. This maintains stable conductivity while achieving precise moisture level control, resolving the contradiction between improving conductivity and maintaining manufacturing precision.
Solution Approach 2:
The patent creates a composite structure combining the conductive layer, porous hydrogel layer, and base layer. This composite material system integrates the water-absorbing properties of hydrogel with the conductive properties of the electrode layer, enabling both improved conductivity through controlled moisture retention and homogeneous moisture distribution, thereby resolving the contradiction between reliability and manufacturing precision.
2Reliability
If too much water is present in the moisture retainer, then conductivity is improved, but the link between the moisture retainer and conductive layer deteriorates, affecting the signal
Solution Approach 1:
The porous hydrogel layer provides controlled water retention through its capillary structure, preventing water accumulation that would cause link deterioration. The porous architecture allows the hydrogel to hold optimal moisture levels without excess water, maintaining both conductivity and link stability between the moisture retainer and conductive layer.
Solution Approach 2:
The patent changes the physical state and retention parameters of water by using hydrogel material with specific porosity and hydrophilic properties. This parameter change enables the moisture retainer to maintain optimal water content that improves conductivity while preventing water excess that would deteriorate the link, thus resolving the contradiction between reliability and stability.
3Measurement precision
If conventional gel is used to reduce impedance for easy signal measurement, then low electric signal variations can be easily measured, but the gel dries quickly in a few hours and complicates electrode handling, preventing long-term measurements
Solution Approach 1:
The patent changes the physical and chemical parameters of the moisture-retaining material by using porous hydrogel instead of conventional gel. The hydrogel's three-dimensional network structure and high water retention capacity allow it to maintain moisture levels for extended periods (days rather than hours), enabling long-term measurements while preserving the impedance-reducing and signal-detecting properties.
Solution Approach 2:
The patent develops a composite electrode structure integrating the conductive layer with a porous hydrogel base layer. This composite material combines the signal-detection capability of the conductive layer with the long-term moisture retention of hydrogel, achieving both precise measurement and extended measurement duration beyond the limitations of conventional gel.
4Reliability
If an impermeable layer is added to reduce evaporation of moisture in the moisture retainer, then moisture transmission is improved, but the liquid surplus between the water retainer and conductive surface and homogeneous vapour transmission are not solved
Solution Approach 1:
The patent uses a porous hydrogel layer as the moisture retainer that inherently controls evaporation through its capillary structure. The porous architecture allows uniform water vapor transmission throughout the material while preventing liquid water accumulation, eliminating the need for additional impermeable layers and achieving homogeneous transmission with improved moisture retention.
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
Ensures consistent electrical contact and high-quality signal detection over extended periods without user intervention, enabling long-term monitoring of physiological parameters without movement artifacts or discomfort.
Implementation Method 1
the second layer is permeable to liquid water in a direction extending inwards towards the material capable of absorbing and retaining water, and is impermeable to liquid water and permeable to water vapour in the opposite direction thereto
Implementation Method 2
a material capable of absorbing and retaining water
Implementation Method 3
the material capable of absorbing and retaining water is located between the first layer and the second layer
Data Source
AI summary
This invention relates to a device for humidifying a textile electrode (1) comprising a first layer (3); a second layer (5); and a material capable of absorbing and retaining water (4); wherein the material capable of absorbing and retaining water (4) is located between the first layer (3) and the second layer (5); the first layer (3) is impermeable to liquid water and water vapour; and the second layer (5) is permeable to liquid water in a direction extending inwards towards the material capable of absorbing and retaining water, and is impermeable to liquid water and permeable to water vapour in the opposite direction thereto. This invention further relates to a system comprising such a humidification device.