Dry EEG Electrode Structure for Hair-Resistant Scalp Contact
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Solution Overview
Problem
Existing EEG devices face challenges with signal reliability due to hair impedance, require gel application for conductivity, have limited durability, and are uncomfortable for prolonged use, necessitating technical assistance and aesthetic constraints.
Innovation Solution
Active dry electrodes with convex sensor blades and coil springs for improved scalp contact, integrated electronic circuits for amplification and filtering, and a design that allows easy setup and removal without assistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional EEG electrode with metal contact surface is used, then electrical contact is established, but skin irritation and allergies occur due to direct contact with skin
Solution Approach 1:
The patent introduces an elastic body as an intermediary between the metal contact surface and the skin. This elastic body acts as a mediator that transmits electrical signals while preventing direct contact between the metal electrode and the skin, thereby eliminating skin irritation and allergies while maintaining reliable electrical contact.
Solution Approach 2:
The electrode is divided into distinct functional segments: a metal contact surface for electrical conduction, an elastic body for skin contact and signal transmission, and a housing for structural support. This segmentation allows each component to perform its specific function optimally without the negative effects of direct metal-skin contact.
2Ease of manufacture
If the electrode structure is simplified, then manufacturing cost decreases, but protection against sweat and sebum infiltration becomes insufficient
Solution Approach 1:
The patent merges multiple protective functions into a single integrated housing structure. The housing simultaneously provides mechanical protection, seals against sweat and sebum infiltration, and supports the elastic body and metal contact surface. This integration achieves robust protection without significantly increasing manufacturing complexity.
3Ease of operation
If the electrode is made compact, then comfort during wear increases, but the structure becomes more complex requiring additional components
Solution Approach 1:
The electrode employs a nested structure where the metal contact surface is embedded within the elastic body, which in turn is housed within the housing. This nesting arrangement achieves a compact form factor that enhances comfort during wear while efficiently organizing components to minimize overall structural complexity.
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
Provides stable signal capture, enhanced user comfort, and ease of use, while maintaining signal quality and design flexibility.
Implementation Method 1
an elastic body made of a silicone rubber composition, wherein the silicone rubber composition has a Shore A hardness of 20 to 80
Data Source
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Figure 2A~2B
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AI summary
There is provided a sensor for an electroencephalographic (EEC) device for measuring electrical signals generated by the neuronal activity of a subject. The sensor has at least one blade-like contact surface and the contact surface has a curved profile adapted for user comfort and electrical contact.