Portable EEG with Flexible Active Electrodes for Comfortable Signal Capture
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Solution Overview
Problem
Existing EEG devices face challenges in ensuring reliable signal capture due to low electrical potential variations, require technical assistance for electrode placement, are uncomfortable for prolonged use, and lack discreetness for consumer applications.
Innovation Solution
A portable device with flexible support and integrated electronic circuits, using active dry electrodes with conductive blades and a housing that forms a means of attachment to a garment, ensuring ease of use, comfort, and discreetness while maintaining signal quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If gel electrodes are used to ensure good conductivity, then signal quality is improved, but device complexity and ease of operation deteriorate due to requiring technical assistance for placement and verification
Solution Approach 1:
The patent employs disposable dry electrodes that eliminate the need for gel application and technical assistance. These single-use electrodes are pre-configured with conductive materials that provide reliable signal quality without requiring placement verification by technicians, thus resolving the contradiction between signal quality and ease of operation.
Solution Approach 2:
The dry electrodes are designed to be self-adhering to the scalp through mechanical attachment structures integrated into the headgear. The electrodes automatically establish electrical contact without requiring manual gel application or technical verification, enabling users to perform electrode placement themselves while maintaining signal quality.
2Reliability
If pins are used to exert significant pressure to reach the scalp, then contact quality is improved, but comfort deteriorates for prolonged use
Solution Approach 1:
The patent uses soft, flexible conductive elements at the electrode-contact points that are specifically designed to conform to the scalp surface. These localized soft contact points provide adequate electrical contact quality while distributing pressure to prevent discomfort during prolonged use, resolving the contradiction between contact quality and comfort.
Solution Approach 2:
The electrodes incorporate flexible conductive films or blades that can bend and adapt to the contours of the scalp. This flexibility allows the electrodes to maintain reliable electrical contact without requiring significant pressure, thereby ensuring comfort for prolonged wear while preserving contact quality.
3Adaptability or versatility
If multiple distinct adjustable parts are used in headgear, then adaptability is improved, but device complexity and ease of operation worsen
Solution Approach 1:
The patent integrates the adjustment mechanism directly into the headgear structure itself, combining what would traditionally be separate adjustable components (straps, clips, positioning elements) into a unified elastic headband system. This merging reduces the number of distinct parts while maintaining adaptability to different head sizes and shapes.
Solution Approach 2:
The headgear employs elastic and flexible materials that dynamically adapt to the user's head shape and size. The elastic bands automatically adjust to fit different head circumferences without requiring manual adjustment of multiple components, simplifying the device while preserving adaptability across various users.
4Reliability
If sensors are positioned to ensure sufficient gripping force, then signal capture is improved, but comfort deteriorates due to localized points of strong pressure
Solution Approach 1:
The patent positions sensors at specific locations on the headgear that naturally contact prominent areas of the skull during normal head movements. These localized sensor positions require minimal gripping force to maintain contact while avoiding areas that would create uncomfortable pressure points, thus resolving the contradiction between signal capture and comfort.
Solution Approach 2:
The headgear is designed with curved surfaces and rounded sensor housings that conform to the spherical shape of the skull. This curvature allows sensors to maintain contact with the scalp through the natural contour of the head rather than requiring strong gripping force, improving comfort while preserving signal capture quality.
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
The device provides excellent signal quality, ease of use, and comfort, making it suitable for consumer applications and research, including ambulatory clinical diagnostics and animal studies.
Implementation Method 1
Surface electroencephalography makes it possible to measure the diffuse electrical potential variations on the surface of the skull
Implementation Method 2
At least some of these arms are elastic or have spring functions which allow the head to be gripped while adapting to its contour, with a sufficient force to ensure the necessary contact of the sensors with the scalp
Data Source
AI summary
According to one aspect, the present description relates to a portable device (10) for acquiring electroencephalographic (EEG) signals emitted by a user. The portable device comprises a flexible support (11) intended to fit a localized region of the skull of the user and a set of sensors (13) of electrical signals generated by the neuronal activity of the user, arranged on said support (11) so as to form contacts with the scalp when the device is worn by the user. For each sensor, an electronic circuit for filtering and amplifying electrical signals detected by said sensor is incorporated in the flexible support (11) and forms, with said sensor, an active electrode. The portable device also comprises a housing (12) comprising an electronic system for processing signals from said electronic filtering and amplification circuits, said housing being linked mechanically to the flexible support to form, with said support, a means of attachment to a garment or accessory intended to be worn by the user.