Elastic Finger-Worn Sensor Structure for Stable Optical Fit
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Solution Overview
Problem
Existing finger-worn sensing devices face challenges in stably fitting to fingers of different thicknesses, improving user comfort, and maintaining stable signal quality during long-term wear.
Innovation Solution
A finger-worn sensing device with a semi-enclosed elastic structure featuring overlapping elastic bands that form an annular space, allowing for self-adaptive fit to different finger sizes, enhancing wearing stability and comfort, and improving measurement accuracy through a tighter fit with the light sensor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conventional finger-worn sensing device is used, then the device structure is simple, but it cannot stably fit to fingers of different thicknesses
Solution Approach 1:
The patent employs elastic bands instead of rigid structures, allowing the device to dynamically adapt to different finger circumferences. The elastic material enables the device to stretch and conform to various finger sizes while maintaining a secure fit, resolving the contradiction between adaptability and structural simplicity.
Solution Approach 2:
The patent changes the physical parameter of the device structure by using elastic material with specific elasticity properties. This allows the device to change its dimensional parameters (circumference, shape) to match different finger sizes, achieving adaptability without significantly increasing structural complexity.
2Reliability
If a conventional finger-worn sensing device is used, then the device is easy to wear, but the wearing comfort is poor during long-term use
Solution Approach 1:
The patent uses elastic bands as flexible elements that can deform and adapt to the finger's shape and movements. This flexibility provides both secure attachment (reliability) and comfort during long-term wear, as the soft elastic material does not irritate the skin while maintaining stable contact with the sensing surfaces.
3Measurement precision
If a conventional finger-worn sensing device is used, then the device structure is simple, but the signal quality becomes unstable during long-term wearing
Solution Approach 1:
The elastic bands provide dynamic adaptation that maintains stable contact between the light emitter, light receiver, and finger tissue during movement and over time. This stable contact ensures consistent optical path and signal quality, achieving improved measurement precision through the elastic mechanism without requiring complex stabilization systems.
4Measurement precision
If a conventional finger-worn sensing device is used, then the device is simple to design, but it cannot provide a tighter fit between the finger and the light sensor
Solution Approach 1:
The elastic bands are pre-configured with appropriate tension to automatically apply consistent pressure when the device is put on the finger. This preliminary elastic force ensures that the light emitter and receiver maintain tight, stable contact with the finger tissue from the moment of wearing, improving measurement accuracy without requiring additional adjustment mechanisms or complex structures.
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 improved wearing stability and comfort by adapting to various finger sizes, ensuring a secure fit and accurate blood oxygen level measurements over time.
Implementation Method 1
a sensing device is just put on the user's finger, and the user's blood oxygen level can be detected by the light sensor in the sensing device
Implementation Method 2
the user's blood oxygen level can be detected by the light sensor in the sensing device
Implementation Method 3
a finger-worn structure, which users can wear for a long time to monitor their blood oxygen level... a semi-enclosed elastic finger-worn structure... the elasticity of the elastic bands
Data Source
AI summary
A finger-worn sensing device includes a measurement-device body and a finger-worn structure. The finger-worn structure includes a carrying base on which the measurement-device body can be detachably mounted. The finger-worn structure also includes a first elastic band and a second elastic band, which extend from opposite sides of the carrying base and which overlap each other under the carrying base to form an annular space for the user's finger. The first elastic band has a first free end. The second elastic band has a second free end. The first free end is closer to the annular space than the second free end. A light emitter and a light receiver are located on the inner walls of the first and second elastic bands, respectively. The light emitter and the light receiver are arranged opposite each other so that they can optically sense physiological readings from the finger.