Dry Electrode Structure for Gel-Free Skin Conductivity
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Solution Overview
Problem
Existing electrodes for measuring biopotential require hydrogel to hydrate the stratum corneum, which is prone to water loss, necessitating expensive packaging and labor-intensive manufacturing processes, limiting their widespread use.
Innovation Solution
The development of dry electrodes using microreplicated ceramic particles with conductive metal coatings, integrated into a sheet article with a supporting layer, allowing for economical mass production and effective skin penetration without hydrogel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If hydrogel is used to hydrate the stratum corneum, then electrical conductivity is improved, but water loss occurs requiring expensive packaging and labor-intensive manufacturing
Solution Approach 1:
The patent extracts and eliminates the hydrogel component from the electrode system, replacing it with dry conductive particles that achieve electrical conductivity through direct skin contact without requiring water-based gels. This removes the source of water loss and eliminates the need for expensive packaging and labor-intensive manufacturing processes.
Solution Approach 2:
The patent changes the physical state of the conductive medium from liquid hydrogel to solid conductive particles. The particles are applied in a dry state and maintain conductivity through their material properties and direct contact with the skin, fundamentally altering the parameter of physical state from liquid to solid.
2Reliability
If hydrogel is used to hydrate the stratum corneum, then electrical conductivity is improved, but packaging costs and manufacturing labor increase
Solution Approach 1:
The patent employs disposable dry electrode patches that are inexpensive to manufacture and use. The conductive particles are applied in a simple, low-cost formulation that does not require expensive packaging materials, making the electrodes economically viable for widespread use.
3Ease of manufacture
If dry electrodes are used without hydrogel, then manufacturing cost is reduced, but skin penetration capability must be maintained
Solution Approach 1:
The patent uses composite conductive particles that combine multiple materials with complementary properties. These particles have inherent skin-penetration capabilities through their material composition and morphology, allowing them to effectively contact the skin and maintain electrical conductivity without requiring hydrogel assistance.
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 a cost-effective and reliable method for manufacturing dry electrodes that maintain electrical conductivity by penetrating the stratum corneum, overcoming the limitations of hydrogel-based electrodes.
Implementation Method 1
The electrodes for these types of physiological tests function as a transducer by transforming the electric potential or biopotentials within the body into an electric voltage that can be measured by conventional measurement and recording devices.
Data Source
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AI summary
Dry electrodes are electrodes for attachment to human skin without skin preparation or the use of electrolyte gels. The electrode includes a substrate, electrically conductive particles with at least one point, in contact with the substrate, a supporting layer that envelopes the electrically conductive particles with points that protrude from the supporting layer, and an electrical connector. Some electrodes have an electrically conductive substrate, other electrodes have an electrically conductive supporting layer.