Shape-Memory In-Ear Biosensor for Gel-Free EEG Monitoring
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Solution Overview
Problem
Conventional polysomnography (PSG) devices are cumbersome, require multiple wired sensors, electrically conductive gel, and are limited to laboratory settings, making them costly, uncomfortable, and inefficient for monitoring sleep quality.
Innovation Solution
A shape-memory in-ear biosensor using a polymer earpiece with embedded electrodes that unfolds within the ear canal to establish a low-impedance connection without conductive gel, utilizing a shape-memory polymer that transitions from a programmed to a fixed state at body temperature, allowing for comfortable and effective detection of brainwaves.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional polysomnography devices are used with multiple wired sensors and conductive gel, then measurement precision is improved, but device complexity and ease of operation deteriorate
Solution Approach 1:
The patent combines multiple sensor functions (EEG, EOG, EMG) into a single integrated in-ear device. The earpiece structure integrates electrodes for detecting multiple physiological signals simultaneously, eliminating the need for separate wired sensors placed on different body parts. This merging approach maintains measurement precision while dramatically reducing device complexity.
Solution Approach 2:
The in-ear biosensor serves multiple functions: it detects EEG signals from brain activity, EOG signals from eye movements, and EMG signals from muscle contraction all through a single device. The universal design allows one sensor to replace the traditional multiple specialized sensors, improving ease of operation while maintaining comprehensive measurement capability.
2Measurement precision
If traditional PSG devices require professional installation and conductive gel, then measurement precision is improved, but ease of operation and adaptability deteriorate
Solution Approach 1:
The earpiece is designed to be self-adhering to the ear canal without requiring professional installation assistance. The flexible polymer material naturally conforms to the ear canal shape through its own elastic properties, eliminating the need for professional technicians to manually position and secure multiple sensors. This self-service capability dramatically simplifies operation while maintaining signal detection accuracy.
Solution Approach 2:
The patent removes the conductive gel requirement from the system entirely. Instead of using gel to enhance electrical contact between sensors and skin, the invention uses directly-contacting electrodes integrated into the earpiece that establish low-impedance connections through the ear canal's natural conductivity. This extraction of the gel component simplifies operation and eliminates the need for periodic reapplication while maintaining measurement precision.
3Measurement precision
If conventional polysomnography is limited to laboratory settings, then measurement precision is improved, but adaptability and ease of operation deteriorate
Solution Approach 1:
The earpiece is constructed from flexible polymer materials that can adapt to various ear canal shapes and sizes. This flexibility allows the device to be worn by patients in different positions and settings without requiring the controlled environment of a sleep laboratory. The thin, conformable structure maintains good electrical contact while enabling use in home, clinic, or other diverse environments, dramatically improving adaptability.
4Measurement precision
If multiple wired sensors are attached to the body, then measurement precision is improved, but device complexity and loss of time deteriorate
Solution Approach 1:
The patent merges multiple sensor functions into a single integrated earpiece device. Instead of attaching separate electrodes for EEG, EOG, and EMG measurements at different body locations, the invention combines all these sensing capabilities into one compact unit that contacts the ear canal. This merging dramatically reduces the time required for setup and installation while maintaining comprehensive physiological signal detection.
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 solution provides a low-cost, flexible, and comfortable device for efficient detection of EEG, EMG, and EOG signals, overcoming the limitations of traditional PSG systems by enabling home-based monitoring with high signal quality and reduced noise interference.
Implementation Method 1
The shape memory polymer that is encapsulated in the earpiece can be configured to have a programmed state and a fixed state and may transition from the programmed state to the fixed state when the temperature of the shape memory polymer is raised above the glass transition, or phase transition, temperature of the shape memory polymer.
Implementation Method 2
the glass transition, or phase transition, temperature of the shape memory polymer
Implementation Method 3
the set of flexible conductive electrodes are positioned near the neutral mechanical plane of the earpiece... creating a low impedance electrical connection between the set of flexible conductive electrodes and the surface of the ear canal
Data Source
AI summary
Systems and methods for a shape-memory in-ear biosensor for polysomnography and monitoring physiological signals are provided. Various embodiments include an earpiece made from a shape memory or temperature-dependent phase transition material embedded into polydimethylsiloxane elastomer body. The earpiece can use electrodes to detect physiological signals by making direct contact with a user's skin and without the use of electrically conductive gel. When heated above the glass transition temperature of the shape memory polymer, various embodiments of the biosensor may be folded. When cooled, the biosensor will maintain the folded shape. The folded biosensor may then be inserted into the ear canal of a user where, in response to heating by the user's body, it partially unfolds to conform to the shape of the ear canal.