Biostimulator Tether Release Mechanism for Jam-Resistant Torque Transfer
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Solution Overview
Problem
Existing biostimulator transport systems for leadless cardiac pacemakers are complex, expensive, and prone to jamming due to precise mechanical tolerances and uneven torque distribution, complicating delivery and release in limited anatomical spaces.
Innovation Solution
A biostimulator transport system with a locking tube and tether mechanism that allows for simple, reliable retention and release, featuring a locking end wider than the tether body to securely engage and evenly distribute torque, reducing the likelihood of jamming and requiring minimal length for torque transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing biostimulator transport systems use complex tether mechanisms with precise mechanical tolerances to achieve secure retention and release, then the attachment and detachment functions are improved, but the device complexity and manufacturing cost increase significantly
Solution Approach 1:
The tether mechanism is segmented into distinct functional components: a locking tube with internal features, a tether with specific end geometry, and an attachment feature with corresponding structures. This segmentation allows each component to perform its specific function independently, simplifying the overall design while maintaining reliability
Solution Approach 2:
The tether end features and attachment feature are designed to automatically engage and disengage through their geometric configurations. The locking tube and tether end features work together to provide self-aligning, self-locking functionality without requiring complex external mechanisms or precise mechanical tolerances
2Force
If existing torque transmission structures are used to bind the transport system to the biostimulator, then torque transmission is achieved, but the structures are prone to jamming due to misalignment and uneven torque distribution
Solution Approach 1:
The tether end features and attachment feature utilize asymmetric geometric configurations that provide natural alignment during engagement. The locking tube and tether end features are designed with specific asymmetric shapes that guide proper orientation, preventing misalignment and ensuring even torque distribution around the attachment feature
Solution Approach 2:
The design changes the geometric parameters of the tether end features and attachment feature to optimize torque distribution. By adjusting the shape, size, and orientation of these features, the system achieves uniform torque distribution that prevents jamming while maintaining effective torque transmission
3Length of moving object
If the overall length of torque transmission features is reduced to accommodate limited space in target anatomy, then the device profile is improved, but the torque transmission capability and reliability may be compromised
Solution Approach 1:
The tether mechanism utilizes a flexible tether design that can transmit torque effectively over a compact length. The tether's flexible construction allows it to maintain structural integrity and torque transmission capability while occupying minimal space within the transport system and target anatomy
Solution Approach 2:
The tether and attachment features are designed with composite structural characteristics, combining rigid elements for torque transmission with flexible elements for compact packaging. This composite approach enables effective torque transmission over reduced lengths while maintaining reliability
Data Source
AI summary
A biostimulator transport system includes a locking tube having a central lumen. The biostimulator transport system includes a tether extending through the central lumen. The tether includes a locking end coupled to a tether body. The locking end is wider than the tether body. Other embodiments are also described and claimed.