Deflectable EP Catheter Fixed Loop Mapping
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Solution Overview
Problem
Existing electrophysiology (EP) catheters face challenges in efficiently accessing and mapping the complex anatomy of the heart, particularly the pulmonary veins, due to limited deflection capabilities and interference from far-field effects in electrocardiogram signals.
Innovation Solution
The development of EP catheters with a distal portion featuring a single shallow helical fixed-diameter loop and an offset shaft-to-loop axis, allowing for 180-degree deflection in a small space, equipped with 10 or 20 electrodes in a bipolar configuration to reduce far-field effects and enhance mapping capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a traditional EP catheter with limited deflection capability is used, then the catheter structure is simple and easy to manufacture, but the ability to access complex cardiac anatomy such as pulmonary veins is limited
Solution Approach 1:
The catheter is divided into distinct segments: a rigid proximal shaft for stability, a flexible intermediate section for navigation, and a deflectable distal loop for positioning. This segmentation allows each portion to be optimized for its specific function while maintaining overall catheter performance
Solution Approach 2:
The catheter incorporates dynamic deflection capabilities through movable components including a deflection wire that can be actuated to change the loop orientation, and a flexible braid construction that allows controlled bending while maintaining structural integrity
2Measurement precision
If a single shallow helical fixed-diameter loop with 180-degree deflection capability is implemented, then the mapping precision in difficult-to-reach areas is improved, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
The distal loop is pre-formed into a specific shallow helical configuration with fixed diameter during manufacturing, establishing the optimal geometry for pulmonary vein mapping before the catheter is used clinically. This pre-forming simplifies the manufacturing process compared to creating complex adjustable mechanisms
Solution Approach 2:
The catheter design specifies particular geometric parameters for the loop (shallow helical shape, fixed diameter, 180-degree deflection range) that are optimized for cardiac mapping. These parameters are carefully selected to balance mapping precision with manufacturability
3Measurement precision
If bipolar electrode configuration is used to reduce far-field effects, then the diagnostic accuracy is improved, but the device complexity increases due to additional electrodes and wiring
Solution Approach 1:
Multiple bipolar electrode pairs are integrated into a single catheter shaft, with each pair consisting of two electrodes that function together as a differential sensing element. This merging approach reduces far-field interference by measuring potential differences between closely spaced electrodes rather than relying on a single electrode
Data Source
AI summary
An EP catheter includes a tubular body having a proximal region, a neck region, and a distal portion predisposed into a single shallow helical fixed-diameter loop configuration and including a plurality of diagnostic electrodes. In deflectable catheter forms, at least one activation wire extends through at least a portion of the proximal region of the catheter body and is adapted to deflect the up to approximately 180 degrees relative to the proximal region. The catheter can be operated manually by a clinician or via a clinician-surrogate such as a computer processor-controlled surgical system. In addition, a variety of localization, visualization, and/or orientation-specific elements can be incorporated into the devices described, depicted, and claimed herein (e.g., metallic coil members, active impedance emitting or receiving electrodes, fluoroscopically opaque materials, and the like).