Platinum-Iridium Coated Medical Electrode for Low-Impedance Adhesion
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Solution Overview
Problem
Existing electrical conductors, particularly medical electrodes, face challenges with high impedance, low charge storage capacity, and poor long-term stability, especially at lower frequencies, due to the lack of a suitable coating layer and adhesion issues with conductive polymers.
Innovation Solution
The use of a substrate with a first layer comprising a platinum-iridium alloy with an iridium content of at least 30% by weight, combined with a second layer of conductive polymer, improves adhesion and reduces impedance, while maintaining mechanical strength and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a substrate is coated with an electrically conductive polymer to improve electrical properties, then impedance is reduced and charge storage capacity is improved, but adhesion becomes problematic and sections of the polymer detach from the substrate
Solution Approach 1:
The patent introduces an intermediary layer between the substrate and the conductive polymer coating. This intermediate layer serves as a mediator that enhances the bonding interface, allowing the conductive polymer to adhere firmly to the substrate while maintaining its electrical functionality. The intermediary layer resolves the adhesion problem by creating a compatible interface between the two materials.
Solution Approach 2:
The patent employs a composite structure consisting of multiple layers with different material properties. By combining the substrate, an intermediate layer, and the conductive polymer coating into a composite system, the invention leverages the advantages of each material while mitigating their individual weaknesses, particularly the adhesion issues between substrate and polymer.
2Strength
If the substrate is laser-structured to improve adhesion of the conductive polymer, then adhesion is enhanced, but the impedance remains too high and charge storage capacity remains too low
Solution Approach 1:
The patent modifies the parameters of the substrate surface through controlled laser structuring, creating specific surface characteristics that enhance polymer adhesion. By adjusting laser parameters such as power, pulse duration, and scanning speed, the invention optimizes the surface morphology to achieve both strong adhesion and maintained electrical properties.
Solution Approach 2:
The laser structuring creates local variations in surface properties, with different regions having distinct characteristics that favor polymer adhesion. This local modification allows the substrate to exhibit enhanced adhesion in contact with the polymer while preserving the bulk electrical properties of the substrate material.
3Reliability
If a coating layer is added to reduce impedance and improve charge storage capacity, then electrical properties are improved, but the device complexity increases
Solution Approach 1:
The patent divides the coating system into multiple functional layers, each with a specific role. The substrate provides mechanical support and baseline electrical properties, while the conductive polymer coating provides enhanced charge storage capacity. This segmentation allows each layer to be optimized independently for its specific function.
Solution Approach 2:
The conductive polymer coating serves multiple functions simultaneously: it reduces impedance, increases charge storage capacity, and provides a biocompatible surface. By combining multiple functions into a single coating layer, the invention improves electrical properties without proportionally increasing device complexity.
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
This configuration results in electrical conductors with significantly reduced impedance, increased charge storage capacity, improved mechanical robustness, and enhanced long-term stability, addressing the limitations of previous technologies.
Implementation Method 1
adhesion of the electrically conductive polymer to the substrate is difficult to achieve
Implementation Method 2
the electrical conductor should have a very low impedance
Data Source
AI summary
An electrical conductor, in particular a medical electrode, comprising a substrate having a surface on which is arranged a first layer that comprises a platinum-iridium alloy and a second layer that comprises a conductive polymer and is arranged on the first layer. The invention further relates to a method for manufacturing such an electrical conductor, in particular for manufacturing a medical electrode.