Stretchable Electrode Pad Structure for Stable Skin Impedance
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Solution Overview
Problem
Existing living body sensors face challenges in maintaining low impedance between electrodes and the skin surface over time due to gaps forming between the electrode and the skin, leading to increased impedance and noise in biometric signal measurements.
Innovation Solution
An electrode pad with a first conductive layer having an elongation at break of 50% to 600% and a second conductive layer containing 0.1% to 40% by mass of metal chloride, ensuring low impedance and stable adhesion to the skin, reducing polarization voltage and facilitating effective charge transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional electrode structure is used with holes in the attachment surface, then the electrode can be attached to the skin, but gaps form between the electrode and skin leading to increased impedance
Solution Approach 1:
The patent changes the physical parameters of the electrode by specifying an elongation at break of 50% to 600% for the first conductive layer and controlling the metal chloride content (0.1% to 40% by mass) in the second conductive layer. These parameter changes enable the electrode to maintain low impedance by allowing sufficient deformation to conform to skin surface irregularities while preventing gap formation.
Solution Approach 2:
The patent employs a composite electrode structure consisting of a first conductive layer (with specific elongation properties) and a second conductive layer (containing metal chloride). This composite material approach combines the advantages of both layers: the first layer provides flexibility and followability to skin deformation, while the second layer ensures conductivity and low impedance, resolving the contradiction between maintaining contact and preventing gap formation.
2Adaptability or versatility
If the electrode is made more flexible to follow skin motion, then followability improves, but structural integrity and stable contact may be compromised
Solution Approach 1:
The patent optimizes the elongation at break parameter of the first conductive layer within the range of 50% to 600%. This parameter change allows the electrode to achieve sufficient flexibility to follow skin motion and conform to surface irregularities while maintaining adequate structural integrity to prevent deformation and ensure stable contact during use.
Solution Approach 2:
The composite structure of two conductive layers with different functional properties resolves the contradiction between flexibility and strength. The first conductive layer provides the necessary flexibility and elongation for followability, while the second conductive layer containing metal chloride provides structural support and maintains electrical conductivity, ensuring both adaptability and structural integrity.
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 pad maintains low impedance and reduces noise in biometric signal measurements, enabling stable and accurate acquisition of biometric information over extended periods with improved followability to skin motion and irregularities.
Implementation Method 1
the first conductive layer has an elongation at break of 50% to 600%
Implementation Method 2
the second conductive layer contains 0.1% by mass to 40% by mass of a metal chloride
Data Source
AI summary
An electrode pad includes a first conductive layer, and a second conductive layer provided on one surface of the first conductive layer, wherein the first conductive layer has an elongation at break of 50% to 600%, and wherein the second conductive layer contains 0.1% by mass to 40% by mass of a metal chloride.