Three-Layer Electrode for Soft Tissue Measurement
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Solution Overview
Problem
Flexible electronic components face damage to their conductive layers when extended and contracted, particularly when measuring soft materials in motion, such as cardiomyocytes, due to insufficient flexibility and surface conformability.
Innovation Solution
A three-layer structure for the electrode part, comprising a core material with a low Young's modulus, a relaxation layer with a higher Young's modulus, and a conductive layer, where the core material is made of polyurethane or silicon rubber, the relaxation layer is parylene, and the conductive layer is gold or platinum, preventing damage during extension and contraction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a conductive layer is patterned on a flexible fiber net for measurement, then measurement capability is achieved, but the conductive layer becomes damaged when the soft material is in motion
Solution Approach 1:
The patent applies composite materials by creating a three-layer structure consisting of a core material (soft polymer), a relaxation layer (intermediate modulus material), and a conductive layer. This composite structure allows the soft core to conform to moving soft tissues while the relaxation layer buffers mechanical stress, preventing damage to the conductive layer and maintaining both measurement capability and structural integrity
Solution Approach 2:
The patent applies local quality by giving different mechanical properties to different layers of the fiber structure. The core material has low Young's modulus for flexibility and conformability, while the relaxation layer has higher Young's modulus to provide structural support and stress distribution. This localized differentiation of material properties allows the electrode to simultaneously achieve softness for motion compatibility and strength for conductive layer protection
2Adaptability or versatility
If the fiber net is made very soft (Young's modulus of several kPa) to conform to soft tissues, then surface conformability is improved, but the conductive layer becomes susceptible to damage during extension and contraction
Solution Approach 1:
The patent uses composite materials to create a multi-layer fiber structure where the core material provides softness for surface conformability while the relaxation layer with higher Young's modulus provides mechanical strength. This composite approach allows the electrode to adapt to soft tissue surfaces without compromising the durability of the conductive layer during dynamic movement
Solution Approach 2:
The relaxation layer acts as a cushioning layer positioned between the soft core material and the conductive layer. This beforehand cushioning structure absorbs and distributes mechanical stress before it reaches the conductive layer, preventing damage during extension and contraction while maintaining the soft surface conformability needed for adapting to tissue surfaces
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 effectively prevents damage to the conductive layer, allowing for accurate measurement of soft, moving objects by alleviating stress between the core and conductive layers, ensuring reliable data collection without hindering the object's movement.
Implementation Method 1
a relaxation layer which covers at least a part of a surface of the core material and contains a material which has a higher Young's modulus than a material which forms the core material
Data Source
AI summary
This fiber net includes a fiber net having an electrode part, in which a fiber constituting the electrode part includes a core material, a relaxation layer which covers at least a part of a surface of the core material and contains a material having a higher Young's modulus than a material forming the core material, and a conductive layer which covers a surface of the relaxation layer on a side opposite to the core material side.