Floating Ear EEG Electrodes for Gel-Free Stable Signal Capture
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Solution Overview
Problem
Existing EEG recording systems are invasive, require surgery for electrode placement, provide localized brain activity readings, require conductive gel for improved signal quality, and are uncomfortable or inefficient in capturing biologically-relevant information due to imperfect contact and reduced conductivity.
Innovation Solution
An in-ear and around-the-ear electroencephalography system with floating electrodes that utilize conductive wires or cables conforming to the ear canal shape, allowing for improved contact and signal capture, and an expandable loop around the ear for comprehensive brain activity readings without the need for conductive gel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If traditional EEG electrodes are positioned in proximity with the reference electrode, then the device structure is simplified, but the measurement precision is limited to localized brain activity only
Solution Approach 1:
The patent transitions from a single-ear localized measurement to a bilateral ear canal configuration, adding spatial dimensionality. By placing electrodes in both ear canals, the system captures brain activity from multiple spatial locations, transforming a one-point measurement into a multi-point distributed measurement system that covers extensive brain regions.
Solution Approach 2:
The patent divides the EEG measurement system into multiple independent electrode units positioned in left and right ear canals. Each electrode acts as an independent measurement point, and their combined data provides comprehensive brain activity coverage. This segmentation allows the system to overcome the limitation of single-location measurement while maintaining relatively simple individual electrode structures.
2Reliability
If conductive gel is applied to improve signal quality, then the electrical conductivity is enhanced, but the device complexity and user convenience deteriorate due to gel application requirements
Solution Approach 1:
The patent changes the physical state of the conductive interface from liquid gel to solid conductive material integrated into the electrode structure. By incorporating conductive materials directly into the electrode design, the system maintains high electrical conductivity while eliminating the need for separate gel application, thereby improving ease of operation without sacrificing signal quality.
Solution Approach 2:
The electrodes are designed with built-in conductive properties, allowing them to self-generate the necessary conductive interface without requiring external gel application. The conductive material is integrated into the electrode structure itself, enabling the device to prepare its own conductive interface automatically upon insertion, thus eliminating manual gel application steps.
3Reliability
If invasive surgical implantation is used to position electrodes, then the contact reliability is improved, but the ease of operation and patient comfort worsen significantly
Solution Approach 1:
The patent replaces the surgical mechanical implantation system with a non-invasive insertion system. Instead of requiring surgical incisions and subcutaneous positioning, the electrodes are designed to be inserted through the ear canal opening, using the natural ear canal pathway. This mechanical substitution eliminates surgical intervention while maintaining stable electrode-skin contact through the conformable ear canal fit.
Solution Approach 2:
The ear canal serves as a natural intermediary pathway that facilitates electrode placement without surgical intervention. By utilizing the pre-existing ear canal structure as a guide and positioning medium, the system achieves reliable electrode contact with the skin while avoiding invasive procedures. The ear canal geometry naturally guides and secures the electrode in the optimal position.
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
Provides non-invasive, comfortable, and efficient capture of bioelectric signals with improved signal quality and comprehensive brain activity readings by ensuring consistent contact through the use of floating electrodes and expandable loops.
Implementation Method 1
The floating electrode comprises a plurality of floating conductive wires... in communication with a signal processor
Implementation Method 2
The inner portion is made of a squeezable yet resilient bio-compatible material... The electrode is adapted to move when squeezed between the biological canal and an outskirt of a portion of the insert
Data Source
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AI summary
A system for reading bioelectrical signals from the skin of a user is provided. The system comprises a plug for inserting in an ear having an inner portion to be inserted into the ear, an outer portion and an inner floating electrode comprising a floating conductive wire, the floating conductive wire being attached to the inner portion of the plug, disposed over the outskirt of the outer portion and communicating with the signal processor. The system further comprises an outer floating electrode for reading a signal from skin around the ear, the floating electrode comprising a floating conductive portion connected to the plug and communicating with the signal processor, a resilient portion adapted to expand and retract the floating conductive portion and a non-conductive linking portion attached to the floating conductive portion. The floating, resilient and non-conductive linking portions form an expandable loop around the ear from the plug.