Angled Yarn Orientation in Endoluminal Vascular Prosthesis
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Solution Overview
Problem
Conventional stent grafts with woven textile graft materials lack flexibility and are prone to instability due to the parallel orientation of warp and weft yarns, which affects their performance characteristics in vascular applications.
Innovation Solution
A method of forming an endoluminal prosthesis by cutting a flat sheet of woven material with warp and weft yarns interlaced at angles relative to the graft material's longitudinal axis, allowing the warp yarns to be disposed between 15 degrees and 75 degrees, or approximately 45 degrees, to enhance flexibility and resistance to radial pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional stent grafts use woven textile graft materials with parallel orientation of warp and weft yarns, then structural stability is achieved, but flexibility and adaptability are reduced
Solution Approach 1:
The patent applies asymmetry by orienting the warp yarns at an angle (e.g., 45 degrees) relative to the longitudinal axis of the prosthesis rather than parallel to it. This asymmetric orientation allows the graft material to deform more flexibly in response to radial pressure while maintaining structural integrity, resolving the contradiction between flexibility and stability.
2Reliability
If conventional stent grafts use woven textile graft materials with parallel yarn orientation, then ease of manufacture is maintained, but performance characteristics such as resistance to radial pressure are compromised
Solution Approach 1:
The patent changes the critical parameter of yarn orientation from parallel (0 degrees) to an angled configuration (e.g., 45 degrees) relative to the longitudinal axis. This parameter change enhances the graft's ability to resist radial pressure by allowing the woven structure to deform more effectively, while still being manufacturable using conventional weaving techniques.
3Adaptability or versatility
If conventional stent grafts use standard parallel yarn orientation, then device complexity is minimized, but flexibility and ability to deform without compromising seam integrity are reduced
Solution Approach 1:
The asymmetric orientation of warp yarns at an angle to the longitudinal axis enables the prosthesis to deform more effectively during balloon modeling and under radial pressure. The angled yarns allow the graft material to expand and contract more flexibly while maintaining seam integrity, achieving enhanced adaptability without significantly increasing device complexity.
Data Source
AI summary
A flat sheet of woven material includes warp yarns and weft yarns interlaced at substantially right angles to each other. A graft material is cut from the flat sheet of woven material such that the graft material includes a graft material longitudinal axis and the warp yarns are disposed at an angle relative to the graft material longitudinal axis. The warp yarns and weft yarns are not parallel to or perpendicular to the graft material longitudinal axis. The graft material is formed into the shape of an endoluminal prosthesis, such as by rolling opposing edges towards each other and securing the opposing edges to each other. The endoluminal prosthesis thus includes warp yarns disposed at an angle relative to the prosthesis longitudinal axis.