Deflectable Catheter Control for Leadless Pacemaker Retrieval
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Solution Overview
Problem
Current systems for delivering and retrieving leadless pacemakers face challenges in precise manipulation, leading to potential damage to the device, cardiac tissue, and the venous system due to insufficient control and precision during implantation and retrieval processes.
Innovation Solution
A catheter-based system with a handle that includes a deflectable section, pull wire, and a brake assembly, allowing for controlled deflection and rotation of the catheter, along with retrieval features like snare and sheath systems, to facilitate precise manipulation and retrieval of leadless pacemakers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a catheter-based system is used for delivering and retrieving leadless pacemakers, then the ability to access the heart through the venous system is improved, but the risk of damage to the venous system, cardiac tissue, and device increases due to insufficient control and precision
Solution Approach 1:
The catheter incorporates a deflectable section that can be dynamically adjusted during the procedure. The handle includes a deflection lever coupled to a pull wire that runs through the catheter shaft, allowing the operator to actively deflect the catheter tip to navigate blood vessels and position the pacemaker with precision, thereby reducing damage risk while maintaining ease of access
Solution Approach 2:
The catheter system includes a brake assembly that can be actuated to increase resistance to rotation of the handle. This parameter change allows the operator to control the rotational speed and precision when manipulating the catheter, particularly during critical moments of device deployment and retrieval, reducing the risk of tissue damage while preserving operational ease
2Manufacturing precision
If the catheter is made more manipulative with additional control features, then the precision of delivery and retrieval is improved, but the device complexity increases
Solution Approach 1:
The catheter is divided into distinct functional sections: a shaft, a deflectable section with its own control mechanism, and a handle with independent control features including a brake assembly. This segmentation allows each component to perform its specific function with optimized simplicity, achieving high manipulation precision without requiring the entire system to be overly complex
Solution Approach 2:
The handle serves multiple functions: it provides mechanical support for the catheter, houses the deflection lever for controlling the deflectable section, and incorporates the brake assembly for controlling rotation. This multi-functionality consolidates control features into a single component, improving manipulation precision while minimizing the addition of separate complex subsystems
Data Source
AI summary
Catheter-based delivery systems for delivery and retrieval of a leadless pacemaker include features to facilitate improved manipulation of the catheter and improved capture and docking functionality of leadless pacemakers. Such functionality includes mechanisms directed to deflecting and locking a deflectable catheter, maintaining tension on a retrieval feature, protection from anti-rotation, and improved docking cap and drive gear assemblies.