Bioelectrode Protrusions for Scalp Contact in Dense Hair
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Solution Overview
Problem
Conventional biological electrodes with increased protrusions for electroencephalography struggle to maintain stable contact with the scalp, especially in subjects with dense hair, requiring excessive pressing that can cause discomfort.
Innovation Solution
A biological electrode design featuring electrode protrusions with a height of 6 to 15mm, arranged on the outer peripheral part of the electrode body, creating a central space to accommodate hair and ensuring stable contact without excessive pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the number of protrusions is increased to increase contact area with the scalp, then the contact area is improved, but the space for housing hair is reduced causing the electrode to float
Solution Approach 1:
The electrode surface is segmented into multiple protrusions that are distributed across the electrode body. Each protrusion makes contact with the scalp at different locations, while the spaces between protrusions accommodate hair. This segmentation allows the electrode to maintain contact stability without requiring excessive pressing force, even in subjects with dense hair.
2Reliability
If strong pressing force is applied to prevent floating and ensure contact, then contact stability is improved, but scalp discomfort increases
Solution Approach 1:
The electrode applies pressing force locally at multiple discrete protrusion points rather than distributing force uniformly across the entire electrode surface. This localized pressing approach ensures stable contact at each protrusion while minimizing overall pressure on the scalp, thereby reducing discomfort for the subject.
3Area of stationary object
If protrusions are densely arranged to maximize contact area, then contact area is improved, but the space for hair accommodation is reduced
Solution Approach 1:
The protrusions are arranged in a three-dimensional configuration with varying heights and spatial distributions. This dimensional arrangement creates vertical and horizontal spaces between protrusions that can accommodate hair of different volumes and densities, allowing the electrode to adapt to subjects with varying hair characteristics while maintaining scalp contact.
Data Source
Figure 1~2
Figure 3~4
AI summary
There is provided a biological electrode capable of realizing good contacting with a scalp of a subject for detection. The biological electrode includes an electrode member 20 in contact with a body of the subject, wherein the electrode member 20 has an electrode body 21 having a plate shape and a plurality of electrode protrusions 22 provided so as to protrude from the electrode protrusion forming surface 21b of the electrode body 21, and the plurality of electrode protrusions 22 are arranged on an outer peripheral part 29 of the electrode protrution forming surface 21b so as to avoid a central part 28 of the electrode protrusion forming surface 21b of the electrode body 21, and a protrusion height h of each electrode protrusion 22 from a proximal end thereof to a distal end thereof in a direction perpendicular to the electrode protrusion forming surface 21b is 6 to 15mm.