Capillary Microfluidic Electrode for Stable Biopotential Measurement
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Solution Overview
Problem
Existing electrode apparatuses for biopotential measurements face challenges in adhering well to the body and maintaining a stable electrolyte layer, which can lead to poor measurement accuracy and discomfort due to the use of adhesives and gel electrolytes that dry out.
Innovation Solution
The electrode apparatus comprises a substrate with a first microfluidic channel made of electrically conductive material, a second microfluidic channel exposed to the external environment for liquid absorption by capillary action, and conduits connecting the two channels, allowing for self-adhesion and continuous liquid supply without adhesives or gel electrolytes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If adhesives and gel electrolytes are used to make electrodes adhere to the body, then adhesion is improved, but comfort deteriorates and reliability worsens due to drying out
Solution Approach 1:
The electrode apparatus uses capillary channels that automatically absorb and transport electrolyte solution from the body surface to the electrode contact points through capillary action, eliminating the need for external adhesives and gel electrolytes that require manual application and maintenance
Solution Approach 2:
The patent replaces the mechanical adhesive bonding system with a capillary-driven fluid transport system, where microfluidic channels with specific surface properties automatically draw and deliver electrolyte solution to maintain reliable electrical contact without mechanical fastening
2Measurement precision
If gel electrolytes are used to enable biopotential measurements, then measurement capability is improved, but duration of action deteriorates as the gel dries out
Solution Approach 1:
The capillary channels continuously absorb fresh electrolyte solution from the body surface and transport it to the electrode contacts, ensuring an uninterrupted supply of conductive medium that maintains measurement quality over extended periods without drying out
Solution Approach 2:
The patent changes the physical state of the electrolyte from a pre-applied gel to a dynamically replenished liquid solution transported through capillary channels, transforming the system from a static electrolyte layer to a continuously refreshed conductive medium
3Strength
If adhesives are used to secure electrodes to the body, then adhesion is improved, but comfort deteriorates
Solution Approach 1:
The electrode apparatus achieves secure attachment through the capillary action mechanism that automatically draws electrolyte solution through microchannels, creating a self-bonding effect that eliminates the need for uncomfortable adhesive materials
Solution Approach 2:
The patent employs capillary channels with specific pore sizes and surface properties that enable automatic fluid absorption and transport, using the porous structure to create both mechanical attachment and functional electrolyte delivery without traditional adhesives
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
This solution enables a high-density, sustainable, and comfortable electrode interface for long-term biopotential measurements, maintaining low impedance and reducing noise, while eliminating the need for adhesives and gel electrolytes.
Implementation Method 1
the second microfluidic channel is exposed to the external environment and configured to absorb liquid by capillary action
Data Source
Figure 1
Figure 2A~3B
Figure 4A~5C
AI summary
An electrode apparatus comprising: a substrate, the substrate comprising: a first microfluidic channel; a second microfluidic channel; and at least one conduit extending between the first microfluidic channel and the second microfluidic channel; wherein the first microfluidic channel and the at least one conduit comprise electrically conductive material, and wherein the second microfluidic channel is exposed to the external environment and configured to absorb liquid by capillary action.