Brain Wave Electrode Protrusion Spacing to Avoid Hair Follicles
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Solution Overview
Problem
Existing brain wave detection electrodes with protrusion portions often fail to maintain contact with the scalp due to tips being placed on hair follicles, leading to unstable brain wave acquisition.
Innovation Solution
A brain wave detection electrode with pyramid-shaped protrusion portions arranged in a square lattice or equilateral triangle configuration, where the distance between adjacent protrusions is optimized to avoid hair follicles, ensuring reliable contact with the scalp.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple protrusion portions with electrode portions at tips are provided, then the electrode can detect brain waves, but the tips may be placed on hair follicles causing loss of contact surface with scalp
Solution Approach 1:
The patent changes the geometric parameters of the protrusion portions by specifying precise distance relationships between adjacent protrusions using mathematical expressions involving hair follicle diameter and spacing. This parameter optimization ensures that the electrode tips fall in interfollicular regions rather than on hair follicles, resolving the contact stability issue caused by hair interference
Solution Approach 2:
The patent performs preliminary design and calculation of the protrusion arrangement pattern before manufacturing, using the mathematical expressions to pre-determine optimal spacing and positioning. This preliminary action prevents the hair follicle contact problem from occurring in the first place, rather than attempting to correct it after electrode placement
2Area of stationary object
If protrusion portions are arranged closely to increase coverage, then more scalp areas can be monitored, but the distance between protrusions decreases increasing likelihood of hair follicle contact
Solution Approach 1:
The patent establishes optimal parameter ranges for protrusion spacing that balance coverage area and contact stability. The mathematical expressions define minimum distances that prevent hair follicle contact while maximizing the number of protrusions within available scalp area, achieving both broad coverage and reliable contact
Data Source
AI summary
Provided is a brain wave detection electrode (50) which is brought into contact with a scalp of a subject to detect brain waves, the brain wave detection electrode including a base portion (51), a plurality of pyramid-shaped protrusion portions (60) protruding from the base portion (51), and an electrode portion provided in the protrusion portion (60), in which a distance D1 between protrusion portions (60) most adjacent to each other among the plurality of protrusion portions (60) satisfies the following expression (1).D1<L(m2+n2)1/2-d or D1>L(m2+n2)1/2+d(1)m and n: an integer of 0 or more, in which either m or n is 1 or more,L: a distance between centers of hair follicles in the scalp of the subject, andd: a diameter of the hair follicle in the scalp of the subject