Catheter Deflection Load Limiter for Tissue Safety
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Solution Overview
Problem
Existing catheter ablation systems lack a reliable mechanism to ensure consistent and controlled force application of electrodes to cardiac tissue during ablation procedures, which can lead to ineffective ablation or tissue damage.
Innovation Solution
The catheter assembly incorporates a deflection drive assembly with a load limiter mechanism, allowing for controlled deflection of the catheter tip and limiting the deflection force to prevent tissue damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the catheter tip is deflected to apply force to cardiac tissue, then ablation efficacy is improved, but tissue damage may occur due to excessive force
Solution Approach 1:
The patent implements a load limiter mechanism that dynamically controls the deflection force parameter of the catheter. The mechanism includes a spring-loaded detent system that allows the catheter tip to deflect and apply force to cardiac tissue for effective ablation, while automatically limiting the maximum force to prevent tissue damage. The spring constant and detent spacing are designed to provide sufficient force for ablation efficacy while establishing a safety threshold that prevents excessive force application.
2Manufacturing precision
If a deflection mechanism is added to control catheter tip position, then ablation precision is improved, but device complexity increases
Solution Approach 1:
The deflection mechanism is segmented into distinct functional components: a flexible catheter shaft that allows controlled bending, a load limiter assembly with spring and detent elements, and a control wire system. This segmentation enables each component to perform its specific function independently while simplifying the overall design. The modular approach allows the complex deflection control to be achieved through simple, well-defined mechanical elements rather than a monolithic complex mechanism.
Solution Approach 2:
The patent introduces a spring-loaded detent mechanism as an intermediary element between the operator's manual deflection input and the catheter tip position. This intermediary automatically limits the force transmission while allowing precise positional control, thereby reducing the complexity of direct force control and simplifying the interface between operator input and catheter response.
3Ease of operation
If manual deflection control is used, then ease of operation is maintained, but force control precision deteriorates
Solution Approach 1:
The load limiter mechanism is designed to be self-regulating, automatically controlling the force applied to cardiac tissue without requiring active feedback control by the operator. The spring-loaded detent system inherently limits the maximum force to a predetermined safe value while allowing full manual deflection control for positioning. This self-service approach maintains ease of operation while ensuring force control precision through passive mechanical constraints.
Data Source
AI summary
An apparatus includes a handle, a catheter, extending distally from the handle, an end effector extending distally from the catheter, a deflection assembly, and a load limiting assembly. The deflection assembly is configured to deflect the end effector away from a longitudinal axis of the catheter. The deflection assembly includes an input member and a translating assembly. The input member is configured to drive the translating assembly to deflect the end effector away from the longitudinal axis. The load limiting assembly is configured to decouple the input member from the translating assembly at a predetermined load such that the input member is inhibited from driving the translating assembly when the input member is decoupled by the load limiting assembly.