Flexible Polymer Electrodes for Ablation Catheters
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Solution Overview
Problem
Existing ablation catheters with metallic electrodes face challenges such as energy absorption, overheating, and signal loss due to their rigidity, which can lead to adverse effects on biological tissues and inefficient ablation procedures.
Innovation Solution
The use of flexible polymer electrodes at the distal end of the catheter allows for bending and navigation through body vessels while providing an ECG output signal, avoiding the issues associated with metallic electrodes by using conductive polymer materials that do not absorb ablation energy and maintain signal integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If metallic electrodes are used in ablation catheters, then ECG signal output is provided, but the electrodes absorb ablation energy and become hot causing adverse effects on biological tissues
Solution Approach 1:
The patent changes the material parameter of the electrodes from metallic to conductive polymer. This material substitution fundamentally alters the interaction with ablation energy - conductive polymers do not absorb microwave ablation energy like metals do, preventing overheating and tissue damage while maintaining ECG signal transmission capability
Solution Approach 2:
The patent employs composite material construction where conductive polymer materials are used to create electrodes that combine electrical conductivity with microwave transparency. The conductive polymer acts as a composite solution that provides the necessary electrical properties for ECG signals while being compatible with microwave ablation energy delivery
2Reliability
If metallic electrodes are used in ablation catheters, then ECG signal output is provided, but the electrodes separate from the catheter when bent resulting in inaccurate or lost signals
Solution Approach 1:
The patent changes the mechanical parameter of the electrodes from rigid (metallic) to flexible (conductive polymer). This flexibility allows the electrodes to bend with the catheter without separating, maintaining stable electrical contact and continuous ECG signal transmission during catheter manipulation
Solution Approach 2:
The patent uses flexible conductive polymer material that can be formed into thin film or coating structures on the catheter. This flexible construction allows the electrode to conform to catheter bending without separation, ensuring stable signal transmission throughout the procedure
3Reliability
If metallic electrodes are used in ablation catheters, then ECG signal output is provided, but the electrodes impede efficient delivery of energy and hinder ablation efficiency
Solution Approach 1:
The patent changes the electromagnetic parameter of the electrode material from metallic (high microwave absorption) to conductive polymer (microwave transparent). This allows ablation energy to pass through the electrode material efficiently without being absorbed or scattered, improving energy delivery to the target tissue and enhancing ablation efficiency
Solution Approach 2:
The patent converts the previously harmful property of metal electrodes (microwave absorption) into a beneficial situation by using conductive polymer that is transparent to microwave energy. The electrode material that once caused energy loss and inefficiency now allows full energy transmission, turning a disadvantage into an advantage for ablation efficiency
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 flexible polymer electrodes enable safe and efficient delivery of energy during ablation procedures by preventing overheating and maintaining accurate signal transmission, reducing the risk of complications and improving procedural efficiency.
Implementation Method 1
electrodes of a flexible conductive material such as a conductive polymer at its distal end for providing an output signal
Implementation Method 2
flexible polymer material which can bend readily with the distal end portion of the catheter as it is shaped or bent
Data Source
Figure 1A~2B
Figure 3A~3B
Figure 4~5
AI summary
A radio frequency (RF) ablation catheter has a flexible distal end portion so that it can be deflected to position an antenna disposed in the distal end portion adjacent a tissue site to be treated. At least one electrical conductor is coupled to the antenna and extends through the catheter to the proximal end of the catheter to a connector at the proximal end of the catheter for connection to a power supply for the RF antenna. At least one electrode is disposed at the distal end portion of the catheter and electrically coupled to the proximal end connector for connection to a monitor. The electrode is of a flexible, electrically conductive material such as conductive polymer material. The electrode may be an electrocardiogram (ECG) electrode.