EEG Matrix Electrode Headcap with Hydrogel Contact
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Solution Overview
Problem
Current EEG electrode solutions are cumbersome, difficult to place, and require specialized training, leading to delayed diagnosis and increased treatment costs, with issues such as unstable skin contact, noise interference, and incompatibility with MRI and CT equipment.
Innovation Solution
A matrix electrode configuration with a non-conductive body part conforming to the skin's contours, spiral electrodes connected via conducting wires, an active hydrogel attachment surface, and a grounding layer to prevent external interference, allowing for rapid and reliable attachment and high-quality EEG measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If cup electrodes are used with the 10-20 system, then measurement precision is improved, but device complexity and ease of operation deteriorate due to requiring 21 electrodes, accurate position determination, skin preparation, and specialized training
Solution Approach 1:
The invention divides the head into multiple regions (frontal, temporal, parietal, occipital) and places electrode arrays in these segmented zones. Each array contains multiple electrodes that collectively capture brain activity from their respective regions, replacing the need for 21 individually positioned electrodes while maintaining measurement accuracy through distributed sampling.
Solution Approach 2:
The electrode arrays are designed to serve multiple functions: they simultaneously capture EEG signals from multiple brain regions, provide redundant measurement paths, and work across different clinical scenarios without requiring reconfiguration or specialized placement knowledge, thus simplifying operation while maintaining precision.
2Measurement precision
If cup electrodes with measuring wires are used, then measurement precision is improved, but ease of operation deteriorates due to rigid connections hindering patient movement and causing movement artefacts
Solution Approach 1:
The invention uses flexible headcaps or headbands as the substrate for mounting electrode arrays. These flexible carriers conform to the patient's head shape and allow natural head movements without creating rigid constraints or generating movement artefacts, while the electrodes maintain stable contact through the flexible medium.
3Measurement precision
If skin preparation and conductive medium are applied, then measurement precision is improved, but loss of time increases due to requiring 30-50 minutes for electrode placement
Solution Approach 1:
The electrode arrays are pre-assembled with conductive elements and mounting structures before use. The headcap or headband is pre-configured with electrode positions, eliminating the need for real-time skin preparation, electrode positioning calculations, and attachment procedures during patient examination, thus reducing placement time while maintaining contact quality.
4Measurement precision
If conventional electrodes are used, then EEG measurement is achieved, but adaptability deteriorates because electrodes are not compatible with MRI and CT equipment requiring removal and reattachment
Solution Approach 1:
The invention employs disposable electrode arrays or headcaps that are designed for single-use. These disposable units can be applied immediately before MRI or CT scans and discarded afterward, eliminating the need to remove and reattach expensive or sensitive electrodes. This approach maintains EEG measurement capability while ensuring full adaptability with imaging equipment without risking electrode damage or patient discomfort from repeated attachment.
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
Facilitates quick and accurate EEG monitoring with improved signal quality, reduced noise, and compatibility with MRI and CT, enabling timely diagnosis and treatment without the need for extensive preparation or specialized skills.
Implementation Method 1
The active attachment surface comprises hydrogel or other electroconductive adhesive material which adheres well to the skin in order to form a stable and essentially interference-free attachment contact between the electrodes and the skin surface
Data Source
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AI summary
An arrangement for carrying out electrode measurements on the surface of the skin of a patient's head for recording the electrical activity of the brain comprises a matrix electrode configuration comprising a body part (100) of non-conductive material conforming to the contours of the surface of the skin. The arrangement comprises electrodes (102) for producing the measurement data connected to the said body part (100), means (104) for transmitting said measurement data and a measurement data unit for receiving sad measurement data for further processing. The body part (100) comprises an electrode placement configuration (108) for maintaining the mutual placements of the electrodes essentially the same with respect to one another and further comprises an active attachment surface (110) located between the electrodes (102) and the surface of the skin for forming a firm and electroconductive contact between the electrodes and the surface of the skin.