Implantable Lead Body Cross-Section for Flexural Fatigue Reduction
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Solution Overview
Problem
Medical electrical leads used in cardiac rhythm management systems face challenges with conductor flexural fatigue and failure due to external forces and natural patient movement, leading to deformation and potential damage of conductors within the lead body lumens.
Innovation Solution
The lead body configuration includes a support portion with a specific thickness and geometry, such as a semi-straight portion or elliptical cross-section, to reduce flexural fatigue by providing structural support and minimizing deformation of lumens during bending, thereby protecting the conductors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the lead body is made highly flexible to accommodate natural patient movement, then ease of operation is improved, but conductor flexural fatigue and failure increase
Solution Approach 1:
The lead body is divided into multiple lumens (coil lumen, cable lumens) separated by a support portion. This segmentation allows each lumen to be independently positioned and protected, reducing the transmission of flexural forces to the conductors while maintaining overall lead flexibility.
Solution Approach 2:
The support portion is positioned specifically between the coil lumen and cable lumens to provide localized structural support. This local reinforcement reduces flexural fatigue in critical areas without compromising the overall flexibility of the lead body needed for patient movement.
2Ease of operation
If the lead body is constructed with minimized profile, then ease of operation is improved, but structural support for conductors is reduced
Solution Approach 1:
Rather than uniformly thickening the entire lead body, the support portion is strategically positioned only where needed between the coil lumen and cable lumens. This provides localized structural support to protect conductors while maintaining a minimized overall profile for ease of operation.
Solution Approach 2:
The support portion extends longitudinally within the lead body, utilizing the longitudinal dimension to provide structural support without increasing the radial profile. This allows the lead to maintain a minimized cross-sectional profile while still providing adequate conductor protection.
3Reliability
If the support portion thickness is increased to reduce flexural fatigue, then reliability is improved, but device complexity increases
Solution Approach 1:
The lead body is segmented into distinct functional regions (coil lumen, support portion, cable lumens) with the support portion having a specific thickness configured to reduce flexural fatigue. This segmentation allows for optimized conductor protection without requiring complex overall lead body design.
Data Source
AI summary
Medical lead body configurations that reduce conductor flexural fatigue. The various lead body embodiments include a support section and can also include other features such as a semi-straight portion of a lumen or semi-straight sides that optimize the reduction in conductor flexural fatigue.