Stent Delivery Reconstraining Member for Precise Repositioning
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Solution Overview
Problem
Existing stent delivery systems face challenges in accurately deploying and repositioning stents due to their tendency to miss the target or shift during expansion, making it difficult to relocate or remove them once deployed.
Innovation Solution
Incorporating a stent reconstraining member secured to the deployment sheath and releasably attached to the stent, allowing for partial deployment, repositioning, and reconstraining of the stent within the sheath for precise placement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a stent is deployed using conventional delivery systems, then the stent can be expanded to treat the vessel, but the stent may miss the target or shift during expansion making it difficult to relocate
Solution Approach 1:
The patent applies the dynamics principle by making the delivery sheath foldable rather than rigid. The foldable sheath can transition between a compressed delivery configuration and an expanded deployment configuration, enabling the operator to partially deploy the stent, retract it if needed, and reposition it to the correct location before final deployment
Solution Approach 2:
The delivery system is segmented into multiple functional components: a foldable sheath, an inner shaft with bumper, and a stent loading region. This segmentation allows independent control of each component - the sheath can be selectively folded/unfolded, the bumper can engage/disengage from the stent, enabling precise control over stent deployment and repositioning
2Strength
If the stent is fully expanded, then it provides structural support, but it cannot be repositioned or removed
Solution Approach 1:
The patent applies partial action by allowing the stent to be partially expanded within the foldable sheath during delivery. The stent can be expanded to a first degree for positioning, then the sheath can be folded to compress and contain the stent for repositioning, and finally the stent can be fully expanded at the correct location. This partial expansion capability provides both structural support when needed and flexibility when repositioning is required
Data Source
AI summary
Stent delivery systems and methods for making and using stent delivery systems are disclosed. An example stent delivery system may include an inner shaft. A deployment sheath may be disposed about the inner shaft. A stent may be disposed between the inner shaft and the deployment sheath. A stent reconstraining member may be secured to an inner surface of the deployment sheath and releasably secured to the stent.