Magnetically Guided Catheter Tip Isolation for Irrigation Corrosion
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Solution Overview
Problem
Existing magnetically-guided catheters face challenges in preventing corrosion of the tip positioning magnet when exposed to irrigation fluid, which is essential for precise control and effective ablation procedures during medical procedures.
Innovation Solution
The design incorporates a tip electrode assembly with a manifold that isolates the magnetic body from irrigation fluid, using a self-supporting tubular structure and an outer capsule made of electrically conductive materials to prevent corrosion, ensuring the magnetic material remains protected from bio-fluids and irrigation fluids.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the tip positioning magnet is exposed to irrigation fluid for effective ablation procedures, then the catheter can perform irrigated ablation, but the magnetic material becomes susceptible to corrosion
Solution Approach 1:
The catheter tip is divided into separate functional zones: a magnetic guidance section containing the magnet and a separate irrigation section with fluid delivery channels. This segmentation allows the magnet to be isolated from irrigation fluid while maintaining both magnetic guidance and irrigated ablation capabilities
Solution Approach 2:
A non-magnetic, corrosion-resistant intermediate structure (such as a non-magnetic alloy framework or coating) is introduced between the magnetic material and the irrigation fluid. This intermediary layer prevents direct contact between the magnet and corrosive fluid while allowing the system to maintain both magnetic responsiveness and irrigation functionality
2Measurement precision
If a magnetically-guided catheter uses a tip positioning magnet for precise control, then navigation precision is improved, but the magnetic material is highly susceptible to corrosion when exposed to bio-fluids
Solution Approach 1:
The catheter is designed as a disposable single-use device, eliminating the need for long-term corrosion resistance. The magnet can be made from highly susceptible but高性能 magnetic materials without concern for durability, as the catheter is discarded after a single procedure, thus maintaining positioning precision without requiring corrosion-resistant materials
Solution Approach 2:
The catheter employs composite construction combining magnetic materials for positioning with corrosion-resistant non-magnetic materials for the structural framework and irrigation channels. This composite approach allows the magnetic component to provide precise positioning while the protective non-magnetic composite structure prevents corrosion from bio-fluid exposure
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 prevents corrosion of the magnetic materials, maintaining the precision and effectiveness of magnetically-guided catheters while ensuring the integrity of the magnetic guidance system, even during irrigated ablation procedures.
Implementation Method 1
magnetically guided catheter devices that are navigated through the patient's body using externally-generated magnetic fields
Implementation Method 2
The externally-generated magnetic fields and gradients are generated to precisely control the position of the catheter within the patient's body
Implementation Method 3
a manifold that isolates the magnetic body from irrigation fluid, using a self-supporting tubular structure and an outer capsule
Data Source
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AI summary
A magnetically-guided catheter 100 includes a tip positioning magnet in the distal electrode assembly configured to interact with externally applied magnetic fields for magnetically-guided movement. A magnetically-guided mapping catheter 100 includes an electrically-conductive capsule in the form of a casing 146 that includes a distal ablation surface and isolates the positioning magnet from bio-fluids to prevent corrosion. An open irrigation ablation catheter includes an isolated manifold that isolates the positioning magnet from contact with irrigation fluid to prevent corrosion.