Hybrid Braided Stent Structure for Plaque Coverage and Positioning
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Solution Overview
Problem
Existing carotid artery stents face issues of low safety due to plaque fragmentation and inaccurate positioning, with cutting stents causing plaque breakage and braided stents having mismatched expansion rates leading to ineffective plaque coverage and downstream fragment flow.
Innovation Solution
A hybrid braided stent with a single-layer structure formed by interweaving filaments of varying end areas, combining fine and coarse filaments to provide uniform plaque stress and accurate positioning, while preventing downstream plaque fragments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a double-layer braided stent structure with outer braided stent and inner metal mesh is used, then plaque coverage is improved, but positioning accuracy deteriorates due to different expansion rates
Solution Approach 1:
The patent merges the outer braided stent and inner metal mesh into a single integrated braided structure where both layers are formed simultaneously from the same delivery system. This single-layer braided design with dual functionality eliminates the positioning accuracy problems caused by differential expansion rates while maintaining effective plaque coverage through the combined mesh structure.
Solution Approach 2:
The single-layer braided stent performs multiple functions simultaneously: the outer braided portion provides radial support and structural integrity, while the inner metal mesh portion provides plaque coverage and fragmentation prevention. This multi-functional design eliminates the need for separate components that would require independent positioning.
2Ease of operation
If cutting stent with open-loop structure is used, then ease of deployment is improved, but safety deteriorates due to plaque fragmentation
Solution Approach 1:
The patent combines the easy deployment characteristics of open-loop cutting stents with the safety features of closed-loop structures by creating a braided design that maintains mesh integrity during expansion. The interwoven filament structure prevents plaque fragmentation while allowing smooth deployment through the delivery system.
Data Source
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AI summary
A hybrid braided stent includes a stent body (20). The stent body (20) is a single-layer structure. The stent body (20) is a tubular structure formed by interweaving a plurality of filaments. The end areas of at least two of the plurality of filaments are different.