Layered Catheter Irrigation Tube for Static Noise Dissipation
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Solution Overview
Problem
Catheter ablation procedures face issues with static electricity buildup in irrigation tubes, leading to noise interference in RF systems, which affects EP mapping and ablation efficacy.
Innovation Solution
The use of irrigation tubes with multiple material layers, including a conductive outer coating layer made of PEDOT:PSS and a wear-resistant layer, to dissipate static charges and reduce noise, while maintaining flexibility and transparency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a single-material irrigation tube is used, then the tube is simple to manufacture, but static electricity builds up causing noise interference
Solution Approach 1:
The irrigation tube is constructed with multiple material layers: an inner layer (e.g., PVC) providing flexibility and biocompatibility, an intermediate layer (e.g., polyurethane) providing durability, and an outer conductive layer (e.g., metal braid or conductive polymer) that dissipates static electricity. This composite structure resolves the contradiction by combining materials with complementary properties to eliminate static buildup while maintaining manufacturability through established multi-layer extrusion or coating processes.
Solution Approach 2:
A conductive intermediate layer is introduced between the insulating inner tube material and the external environment. This intermediate conductive layer acts as a mediator that provides a controlled path for static charge dissipation, preventing charge accumulation that would otherwise cause noise interference in RF systems, while the inner insulating layers maintain their original simple structure for fluid delivery.
2Object-affected harmful factors
If a conductive outer coating layer is added to dissipate static charges, then noise interference is reduced, but the tube structure becomes more complex
Solution Approach 1:
The conductive anti-static feature is implemented as a thin outer coating or surface layer rather than a thick structural component. This thin-film approach provides the necessary electrostatic dissipation functionality while minimizing added complexity and maintaining the tube's flexibility. The coating can be applied through conventional methods such as electrostatic spraying, dip coating, or extrusion, integrating the anti-static function without significantly complicating the manufacturing process.
3Object-affected harmful factors
If multiple material layers are used in the irrigation tube, then static electricity is dissipated effectively, but manufacturing precision requirements increase
Solution Approach 1:
The multi-layer tube is constructed by sequentially forming distinct material layers, each with a specific function (inner layer for fluid contact, intermediate layer for structural support, outer conductive layer for static dissipation). This segmentation allows each layer to be optimized and controlled independently during manufacturing, with thicknesses and material properties tailored to specific requirements, thereby managing precision requirements through functional decomposition rather than requiring perfect uniformity across a single complex material.
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 effectively minimizes static electricity buildup and noise interference, enhancing the accuracy of EP mapping and the effectiveness of RF ablation by preventing static charges from localizing and allowing for better fluid visibility.
Implementation Method 1
The outer coating layer being formed of a polymeric compound including a first polymer or ionomer configured to carry a positive electric charge and a second polymer or ionomer configured to carry a negative electric charge
Data Source
AI summary
An apparatus includes a catheter having a flexible outer sheath and a flexible irrigation tube. The flexible outer sheath defines a first lumen. The flexible irrigation tube is positioned inside the first lumen and includes an inner layer and an outer coating layer. The inner layer is formed of a synthetic polymer compound and has a uniform cross-section with a hollow interior defining a second lumen. The outer coating layer is disposed around the inner layer. The outer coating layer is formed of a polymeric compound and includes first and second isomers. The first isomer is configured to carry a positive electric charge and the second isomer is configured to carry a negative electric charge.