Stretch-Deforming Electrode for Stable Signals Under Large Strain
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Solution Overview
Problem
Wearable physiological sensing devices face issues with sensing electrodes that cannot withstand large stretching deformations due to limb movements, leading to cracks or fractures, which disrupt signal collection and accuracy.
Innovation Solution
A stretch-deforming electrode with specific resistance and length variations, allowing it to withstand large deformations while maintaining stable resistance within certain ranges, combined with a correction mechanism to adjust signal values when deformation exceeds a threshold.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the sensing electrode is made thin and short for wearable applications, then the device becomes more wearable and comfortable, but the electrode cannot withstand large stretching deformation and is prone to cracks or fractures
Solution Approach 1:
The patent changes the physical and chemical parameters of the electrode material by incorporating elastic fibers and conductive particles in specific ratios and arrangements. The elastic fiber content is controlled at 1-50 wt%, and conductive particle content at 1-20 wt%, creating a material that maintains electrical conductivity while exhibiting elastic deformation characteristics that prevent cracking during stretching.
Solution Approach 2:
The patent creates a composite electrode material combining elastic fibers (such as rubber or silicone) with conductive particles (such as metal particles or conductive polymers). This composite structure allows the electrode to withstand stretching deformation without fracturing, as the elastic matrix maintains structural integrity while the conductive particles preserve electrical functionality.
2Adaptability or versatility
If the electrode is stretched to accommodate limb movements, then the device adapts to user motion, but the resistance changes significantly causing signal noise and interruptions
Solution Approach 1:
The patent designs the electrode with specific resistance characteristics that change predictably with stretching. By controlling the elastic fiber and conductive particle composition, the resistance changes within a controlled range (0.01-10 ohms) during stretching, allowing the system to adapt to motion while maintaining measurable signal integrity through compensation algorithms.
Solution Approach 2:
The patent implements a feedback mechanism where the electrode resistance is continuously monitored during stretching. The system detects resistance changes caused by limb movement and applies compensation algorithms to correct the measured physiological signals, thereby maintaining measurement precision despite the stretching-induced resistance variations.
3Device complexity
If the electrode structure is simplified for wearable devices, then the device becomes more compact and wearable, but the electrode lacks the ability to withstand large deformations
Solution Approach 1:
The patent modifies the material parameters of a simple electrode structure by incorporating specific ratios of elastic fibers (1-50 wt%) and conductive particles (1-20 wt%). This allows a structurally simple electrode design to achieve enhanced deformation resistance through optimized material composition rather than complex structural design.
Solution Approach 2:
The patent employs a flexible thin-film electrode structure where the electrode material itself provides both structural simplicity and deformation resistance. The flexible substrate and thin-film construction allow the electrode to be compact and wearable while the elastic fiber-conductive particle composite material ensures it can withstand large deformations without requiring additional structural reinforcement.
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 electrode can withstand significant stretching without fracturing, ensuring accurate signal collection and enabling wider application of wearable sensing systems by correcting signal values when necessary.
Implementation Method 1
the stretching portion has a first stretching range and a second stretching range... the stretching portion includes a plurality of conductive particle structures... an average particle size of the conductive particle structures is between 0.5 nm and 100 μm
Implementation Method 2
the stretching portion includes a plurality of conductive particle structures... the stretching portion includes a plurality of conductive wire structures... an average wire diameter of the conductive wire structures is between 0.5 nm and 1 μm
Data Source
AI summary
A stretch-deforming electrode includes a stretching portion. The stretching portion has a first stretching range and a second stretching range, in which the stretching portion has a first length variation and a first resistance variation in the first stretching range and a second length variation and a second resistance variation in the second stretching range. The first resistance variation remains substantially unchanged when the first length variation changes, the second resistance variation changes when the second length variation changes. The second resistance variation is represented by R2, the second length variation is represented by L2, and R2=A×L2, in which A is a positive number between 0.05 and 2.