In-Ear Biometric Sensor Head Assembly with Light Guides
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Solution Overview
Problem
Traditional health monitors are bulky, uncomfortable, and struggle to isolate biometric signals from spurious signals during physical activity, such as heart rate signals from movement and environmental noise, limiting their effectiveness in monitoring physiological information.
Innovation Solution
A sensor head assembly designed to fit within the ear canal, featuring an optical source and detector with an audio driver, encapsulated in a hydrophobic material, and an ear gel with light guides to enhance optical coupling and reduce motion artifacts, allowing for accurate monitoring of physiological information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional health monitors are made bulky to accommodate sensors, then measurement capability is improved, but comfort and ease of wear during physical activity deteriorates
Solution Approach 1:
The patent transitions health monitoring from traditional wrist-worn form-factor to an in-ear canal form-factor. This dimensional change in placement allows the use of smaller components (miniaturized optical source, detector, and audio driver) while maintaining measurement capability through the ear canal's anatomical structure, thereby resolving the contradiction between measurement precision and comfort during physical activity.
2Measurement precision
If optical sensor output is increased to improve signal detection, then measurement precision is improved, but susceptibility to spurious signals from physical movement and environmental factors worsens
Solution Approach 1:
The patent introduces light guides as intermediary components that couple the optical source and detector to the ear canal tissue. These light guides improve optical coupling efficiency, allowing accurate biometric signal detection at lower optical power levels, thereby reducing the impact of spurious signals from physical movement and environmental interference while maintaining measurement precision.
3Measurement precision
If sensor is pushed firmly against the user to limit movement effects, then measurement precision is improved, but comfort and ease of wear deteriorates
Solution Approach 1:
By relocating the sensor from the wrist to the ear canal, the patent exploits the ear canal's anatomical constraints that naturally limit sensor movement relative to the tissue. This dimensional change in placement eliminates the need for firm pressure to prevent movement artifacts, thereby maintaining measurement precision while significantly improving comfort during wear.
4Ease of operation
If device is miniaturized for comfortable wear, then ease of operation is improved, but device complexity increases due to integration constraints
Solution Approach 1:
The patent merges multiple functions into a single integrated in-ear device: the optical source, optical detector, and audio driver are combined within the ear canal housing. This merging approach allows miniaturization for comfortable wear while managing device complexity through functional integration rather than separate components.
Solution Approach 2:
The in-ear device provides multi-functionality by simultaneously delivering audio output through the audio driver and monitoring biometric signals through the optical detector. This universal design consolidates multiple functions into one device, improving ease of operation through comfortable wear while managing complexity through shared housing and integrated component placement.
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 comfortable, effective means to isolate and monitor biometric signals, reducing noise interference and improving signal-to-noise ratio during physical activity.
Implementation Method 1
An optical source is secured to the body member at a first location
Implementation Method 2
an optical detector is secured to the body member at a second location different from the first location
Implementation Method 3
at least a portion of the audio driver, optical source and optical detector are encapsulated within a hydrophobic material
Implementation Method 4
a first light guide having opposite first and second ends is secured to the inner surface of the ear gel
Data Source
AI summary
A sensor head assembly includes a body member having an internal passage. An optical source is secured to the body member at a first location, and an optical detector is secured to the body member at a second location. An audio driver is secured to the body member. An ear gel configured to be inserted within an ear canal is attached to the body member and has at least a portion thereof transparent to one or more wavelengths of light. A first light guide is secured to an inner surface of the ear gel via a respective first end, and a second light guide is secured to the inner surface of the ear gel via a respective first end. A second end of the first light guide is in optical communication with the optical source, a second end of the second light guide is in optical communication with the optical detector.