Brush Electrode With Capillary Electrolyte for Hairy Skin
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Solution Overview
Problem
Existing electrodes for detecting or applying electrical signals to the skin face challenges in efficiently conducting electrical signals due to the inefficient conversion of electron-based conduction at the skin-electrode interface, often requiring conductive media like gels or saline solutions, which can be messy and impractical, especially on hairy regions.
Innovation Solution
A brush electrode design featuring strand electrodes extending from a base, each tipped with an electrolyte to facilitate ionic conduction, clustered with gaps and held by staples or ferrules, allowing for capillary retention of electrolyte without the need for extensive skin preparation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conductive media like gels or saline solutions are used at the skin-electrode interface, then electrical conduction is facilitated, but the interface becomes messy and impractical, especially on hairy regions
Solution Approach 1:
The patent employs a porous conductive polymer material that can absorb and retain electrolyte within its porous structure. This allows the electrode to maintain ionic conduction capability without requiring external conductive gels or saline solutions, thereby solving the messiness issue while preserving electrical conduction efficiency on hairy skin surfaces.
Solution Approach 2:
The electrode combines conductive polymer material with electrolyte to create a composite structure. The conductive polymer provides both structural integrity and ionic conduction pathways, eliminating the need for separate conductive media applications and improving ease of operation on challenging skin surfaces.
2Reliability
If traditional electrodes are pressed onto the skin, then contact is established, but the interface is not an efficient conductor of electrical signals due to electron-ion conduction mismatch
Solution Approach 1:
The conductive polymer material acts as an intermediary at the skin-electrode interface, facilitating charge conversion between electronic conduction (in the electrode) and ionic conduction (in the skin and electrolyte). This mediator enables efficient electrical signal transmission by bridging the conduction mechanism mismatch between electrons in the electrode and ions in the physiological environment.
3Reliability
If conductive gel is applied to the skin, then electrical conduction improves, but extensive skin preparation and cleaning are required
Solution Approach 1:
The electrode is designed to be self-sufficient by incorporating the conductive polymer material that inherently contains or absorbs electrolyte. This eliminates the need for separate conductive gel application and subsequent skin cleaning steps, as the electrode itself provides the necessary ionic conduction medium through its porous structure.
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 efficient ionic conduction on hairy skin surfaces without the need for conductive gels, maintaining precision and reducing skin wetting, while accommodating various skin contours and providing flexible or rigid contact as needed.
Implementation Method 1
the plurality of strand electrodes are configured to hold the electrolyte by capillary forces
Data Source
AI summary
A brush electrode includes an electrode base that is connectable to an external device that is configured to generate an electrical signal or receive an electrical signal. A plurality of strand electrodes extend outward from the electrode base. A distal end of each strand electrode is configured to contact a skin surface. The strand electrodes are configured to hold an electrolyte to facilitate ionic conduction of the electrical signal to or from the skin surface.