EEG Optode Positioning Cap with Semirigid Telescopic Structures
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Solution Overview
Problem
Existing methods for positioning EEG scalp electrodes and optodes according to the 10-20 pattern are time-consuming and prone to failure, especially when subjects are physically active, as simple elastomeric caps fail to maintain accurate and stable positioning.
Innovation Solution
A cap with semirigid telescopic structures and an elastomeric tensioning system that ensures accurate and stable placement of electrodes and optodes, maintaining even spacing and contact with the scalp during activity, using semirigid links and a tensioning elastic to secure the devices firmly in place.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If individual electrodes are attached with collodion adhesive, then electrode placement can be achieved, but the process is very time consuming and failure prone
Solution Approach 1:
The cap divides the electrode attachment process into pre-positioned slots on the cap body, allowing multiple electrodes to be attached simultaneously rather than individually. The cap itself is segmented into sections that can be independently positioned on the scalp.
Solution Approach 2:
Electrodes are pre-attached to the cap before application to the subject's head. The cap is prepared in advance with all electrodes in their correct 10-20 pattern positions, eliminating the need for time-consuming individual attachment during the procedure.
2Reliability
If a simple elastomeric cap is used, then the device is simple to manufacture, but it fails to hold optodes and electrodes in proper positions and orientations during physical activity
Solution Approach 1:
The cap combines soft elastomeric material for comfort with localized rigid or semi-rigid structures at electrode and optode positions. These stiffening elements provide stable positioning points while the rest of the cap remains flexible to conform to the head shape.
Solution Approach 2:
The cap integrates multiple materials with different properties: elastomeric base material for flexibility and comfort, combined with rigid or semi-rigid components for structural support and positioning accuracy. This composite construction provides both stability during activity and comfort during wear.
3Manufacturing precision
If electrodes are attached individually according to the 10-20 pattern, then accurate positioning can be achieved, but the technique is very time consuming
Solution Approach 1:
The cap serves multiple functions: it positions multiple electrodes simultaneously, maintains the 10-20 pattern spacing, provides mechanical support, and ensures consistent orientation. This multi-functional design eliminates the need for separate positioning operations for each electrode.
Solution Approach 2:
The cap's structure inherently maintains the correct 10-20 pattern spacing through its pre-fabricated geometry. The cap self-positions on the head using anatomical landmarks, and the electrodes self-align to their correct positions through the cap's pre-configured slots and attachments.
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
This solution allows for repeatable and reliable data collection in both electroencephalography and functional neuroimaging, enabling studies on physically active subjects without the need for fMRI, providing improved stability and accuracy over traditional methods.
Implementation Method 1
The cap has semirigid telescopic structures that stiffen it to provide accurate electrode and optode spacing, and stability during subject activity
Implementation Method 2
A prior technique for positioning scalp electrodes is to fabricate an elastomeric cap and attach electrodes to the cap
Implementation Method 3
passing infrared light into the skull from one or more transmit optodes, and receiving that light at one or more receive optodes
Implementation Method 4
measuring differences in attenuation at the two or more wavelengths along paths between optodes
Implementation Method 5
The electroencephalograph can provide information regarding electrical activity in the brain
Data Source
AI summary
An electroencephalographic electrode and optode positioning device has the form of a cap suitable for placement on a subject's head. The cap has semirigid telescopic structures that stiffen it to provide accurate electrode and optode spacing, and stability during subject activity. The cap is intended for use in functional neuroimaging and, although its materials are compatible with fMRI, is usable without fMRI to permit study of physically as well as mentally active subjects.