Modular EEG Headset with Adjustable Bands and Common Mode Rejection
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Solution Overview
Problem
Conventional EEG systems face challenges with high impedance and noise interference, discomfort due to inadequate electrode placement, and limited adaptability to different head sizes, leading to suboptimal signal quality and user experience.
Innovation Solution
A modularly adjustable headset with optimized electrode design and placement mechanisms, including independently adjustable bands and low-impedance electrode interfaces, to enhance comfort and noise reduction while improving signal quality by averaging readings over multiple electrodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional EEG electrodes are used, then electrical activity can be measured, but high impedance and noise interference occur
Solution Approach 1:
The patent combines multiple electrodes (at least three electrodes including first, second, and third electrodes) to form a common mode rejection circuit. This merging of multiple measurement points allows the system to distinguish between common-mode noise and differential EEG signals, thereby reducing noise interference while maintaining measurement precision.
Solution Approach 2:
The patent converts the harmful effect of common-mode noise into a measurable parameter by using it as a reference signal in the common mode rejection circuit. By measuring and subtracting the common-mode component, the system transforms noise from an obstacle into a useful reference for signal purification.
2Adaptability or versatility
If fixed electrode placement is used, then device structure is simple, but adaptability to different head sizes is limited
Solution Approach 1:
The patent implements adjustable headband structures that can be dynamically reconfigured to accommodate different head sizes and shapes. The headband includes adjustable segments and flexible components that allow dynamic adaptation to various user anatomies, enhancing versatility without excessive complexity.
Solution Approach 2:
The headband is divided into multiple adjustable segments and sections that can be independently configured. This segmentation allows the device to adapt to different head sizes by adjusting individual segments, maintaining structural simplicity while achieving high adaptability.
3Reliability
If standard electrode pressure is applied, then electrode contact is maintained, but user comfort is reduced
Solution Approach 1:
The patent applies different pressure characteristics to different regions of the headband and electrode contacts. Certain areas are designed with enhanced compliance and softness to maintain reliable electrode contact, while other areas are optimized for comfort with reduced pressure. This localized differentiation allows the system to maintain contact reliability without compromising overall user comfort.
Data Source
AI summary
Example devices are disclosed herein that include a first elongated band coupled to a first housing to be located on a first side of a head of a subject and a second housing to be located near a second side of the head of the subject, the first elongated band comprising a first set of electrodes. The example device also includes a second elongated band coupled to the first housing and to the second housing, the second elongated band comprising a second set of electrodes. In addition, the device includes a third elongated band coupled to the first housing and to the second housing, the third elongated band comprising a third set of electrodes.