Conductive Member Cyclic Dimethylpolysiloxane Control
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Solution Overview
Problem
Conductive members containing silicone rubber and a conductive agent with high levels of cyclic dimethylpolysiloxane exhibit excessively high volume resistivity, hindering precise biosignal measurement.
Innovation Solution
A conductive member with a total content of cyclic dimethylpolysiloxane having 3 to 24 silicon atoms of 5000 ppm or less is developed, utilizing a combination of silicone rubber and a conductive agent, such as carbon black, to reduce volume resistivity while maintaining flexibility and biological safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the total content of cyclic dimethylpolysiloxane having 3 to 24 silicon atoms is more than 5000 ppm, then the conductive member contains silicone rubber and conductive agent, but the volume resistivity becomes excessively high
Solution Approach 1:
The patent applies parameter changes by precisely controlling the content of cyclic dimethylpolysiloxane (specifically D3 to D24 compounds) to 5000 ppm or less. This quantitative parameter control resolves the contradiction by reducing the harmful polysiloxane content that causes high volume resistivity, while maintaining the beneficial properties of silicone rubber such as flexibility and biological safety. The specific threshold of 5000 ppm represents an optimized parameter that balances conductivity and material properties.
Solution Approach 2:
The patent employs composite materials by combining silicone rubber with conductive agents (such as carbon black, metal particles, or conductive polymers) in a controlled formulation. This composite approach allows the material to simultaneously achieve low volume resistivity through the conductive agent while maintaining the inherent advantages of silicone rubber (flexibility, biocompatibility). The composite structure enables both materials to contribute their strengths without the cyclic dimethylpolysiloxane content interfering with electrical conductivity.
2Ease of manufacture
If the total content of cyclic dimethylpolysiloxane having 3 to 24 silicon atoms is more than 5000 ppm, then the conductive member is formed, but precise biosignal measurement is hindered
Solution Approach 1:
The patent resolves this contradiction by establishing a critical parameter threshold of 5000 ppm for cyclic dimethylpolysiloxane content. By controlling this parameter at or below the threshold, the material maintains both manufacturability and biosignal measurement precision. The parameter optimization ensures that the conductive member can be successfully formed while avoiding the excessive volume resistivity that would interfere with precise biosignal detection.
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 lowers the volume resistivity of the conductive member, enhancing the precision of biosignal measurements and maintaining the necessary flexibility and biological safety for bioelectrode applications.
Implementation Method 1
a conductive member containing silicone rubber and a conductive agent wherein a total content of cyclic dimethylpolysiloxane having 3 to 24 silicon atoms is 5000 ppm or less
Data Source
AI summary
A conductive member contains silicone rubber and a conductive agent. The total content of cyclic dimethylpolysiloxane having 3 to 24 silicon atoms in the conductive member is 5000 ppm or less.