EEG Electrode Headgear with Dual Non-Contact and Contact Modes
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Solution Overview
Problem
Conventional electroencephalography electrodes require contact with the scalp, causing discomfort and reduced measurement quality due to hair displacement and dehydration of contact gel.
Innovation Solution
Non-contact capacitive electrodes that utilize capacitive coupling with the scalp, where hair acts as a dielectric, combined with a dual electrode assembly featuring a dry electrode with contact pins for dense hair scenarios.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional contact electrodes are used to contact the scalp, then electrical signals can be recorded, but user comfort deteriorates due to hair displacement and contact gel dehydration
Solution Approach 1:
The patent replaces the mechanical contact system (electrodes pressing against the scalp through hair) with a capacitive coupling system. The electrode assembly includes a first electrode positioned away from the scalp and a second electrode in contact with the scalp, creating a capacitor that couples electrically to the scalp without direct mechanical contact. This substitution eliminates hair displacement and contact gel dehydration while maintaining signal recording capability.
2Ease of operation
If non-contact capacitive electrodes are used, then user comfort improves by eliminating direct scalp contact, but measurement precision deteriorates when hair is especially full or dense
Solution Approach 1:
The patent creates a dual-electrode assembly that can function in multiple modes: capacitive coupling mode for general use (providing comfort) and contact mode for dense hair scenarios. The second electrode can be positioned to contact the scalp when needed, allowing the same device to adapt to different hair densities and provide both comfort and measurement precision across various users.
3Measurement precision
If a comb-like electrode design is used for dense hair, then contact with the scalp is achieved, but device complexity increases
Solution Approach 1:
The patent segments the electrode system into distinct functional components: a first electrode for capacitive coupling, a second electrode for contact mode, and a housing with positioning mechanisms. This segmentation allows each component to perform its specific function independently, simplifying the overall design compared to a complex comb-like structure while maintaining the ability to achieve scalp contact when necessary.
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
Improves user comfort and measurement quality by eliminating direct scalp contact, maintaining effective signal capture through capacitive coupling and providing alternative contact methods for dense hair.
Implementation Method 1
The disclosed non-contact electrodes can overcome this problem through capacitive coupling with the scalp, with the hair acting as a dielectric
Implementation Method 2
capacitive coupling with the scalp, with the hair acting as a dielectric
Implementation Method 3
an electrochemical reaction takes place at the junction of the electrolyte and the metal of the electrode due to electrical transfer by oxidation and reduction reactions
Data Source
AI summary
An apparatus comprises a dual electrode assembly comprising: a non-contact electrode, a dry electrode having multiple contact pins, and a housing configured to enclose the dry electrode when the dry electrode is in a first position, and to expose the multiple contact pins outside the housing when the dry electrode is in a second position.