In-Ear Hearing Aid PPG Sensors for Low-Noise Measurements
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Solution Overview
Problem
The challenge of integrating biometrical sensors into hearing aids, particularly in-ear styles, is exacerbated by the limited space in the ear canal, which affects signal quality due to insufficient skin contact and interference from ambient conditions, leading to degraded signal integrity and increased device size.
Innovation Solution
Optimizing sensor positioning within the ear canal by using focused optical media in PPG sensors and flexible, gel-based domes with conductive particles to enhance signal quality and reduce power consumption while maintaining mechanical freedom and user comfort.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If biometrical sensors are integrated into in-ear hearing aids, then health monitoring capabilities are improved, but device size increases and signal quality degrades
Solution Approach 1:
The patent combines multiple functions (hearing aid and biometrical sensing) into a single integrated device. The sensor electronics are merged with the hearing aid components, allowing health monitoring capabilities to be added without requiring a separate device, thus avoiding the volume increase that would result from adding a separate sensing device.
Solution Approach 2:
The hearing aid device is designed to perform multiple functions: audio processing and biometrical signal acquisition. By making the device universal, it eliminates the need for separate specialized devices, maintaining compact size while adding health monitoring capabilities through integrated sensors that share the same physical space and power supply.
2Measurement precision
If sensors are placed close to skin for robust contact, then signal quality improves, but device complexity increases
Solution Approach 1:
The patent introduces a flexible dome as an intermediary element between the sensor electronics and the skin. This dome provides the necessary mechanical compliance to ensure robust skin contact for high-quality signals, while the sensor array and signal processing electronics handle the complexity of maintaining consistent contact and processing the resulting signals.
Solution Approach 2:
The system employs dynamic adaptation through multiple sensors and signal processing algorithms that adjust to varying contact conditions. The flexible dome dynamically conforms to ear canal geometry, and the electronic system dynamically processes signals from multiple contact points, reducing the need for overly complex mechanical contact mechanisms.
3Measurement precision
If multiple sensors are added to improve biometrical measurements, then measurement accuracy improves, but device complexity and power consumption increase
Solution Approach 1:
The patent uses an array of sensors (excessive action) to ensure that sufficient biometrical signals can be obtained from at least one sensor among multiple sensors. This approach improves measurement accuracy by having redundant sensing capabilities, while the system is designed to process only the necessary signals, managing power consumption by activating and processing data from the minimum required sensors.
4Measurement precision
If sensors are positioned in the ear canal for biometrical signals, then signal acquisition improves, but ambient interference increases
Solution Approach 1:
The system uses feedback through multiple sensors and signal processing to distinguish between desired biometrical signals and ambient interference. By monitoring signals from multiple contact points and analyzing patterns, the system can identify and filter out ambient noise while maintaining accurate acquisition of physiological signals from the ear canal 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
Improves signal quality and reduces power consumption in biometrical measurements by minimizing noise and skin contact interference, allowing for more efficient data collection and user comfort in hearing aids.
Implementation Method 1
Optimizing sensor positioning within the ear canal by using focused optical media in PPG sensors
Data Source
AI summary
A hearing aid having one or more biometrical sensors, where the hearing aid comprises at least one microphone configured to receive a sound of the surroundings, a signal processor configured to process the sound received from the microphone and a speaker unit configuration configured to emit the processed sound into the ear of a user, wherein one or more sensors is positioned substantially in the ear together with at least a part of the hearing aid, wherein the one or more sensors is configured as biometrical sensors configured for recording health data of a hearing aid user.