Lumen Stent Radial Deformability for Endoleak Prevention
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Solution Overview
Problem
Luminal stent grafts with high radial rigidity may fail to securely attach to varying lumen walls, leading to type-I endoleaks due to individual anatomical differences and calcified plaques, which can result in continuous blood flow into dissection or aneurysm cavities, potentially causing their enlargement and rupture.
Innovation Solution
A luminal stent graft design featuring a first tubular body with a second tubular body sleeved outside, where the second tubular body has a greater radial deformability and supporting structure, allowing it to conform to the lumen wall and seal gaps, using a waveform ring-like or meshed structure with adjustable radial length and width to prevent endoleaks without additional sealing materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the radial supporting force of the stent graft is increased to prevent falling off, then the fixation reliability is improved, but the rigidity increases causing poor adaptability to varying lumen wall shapes
Solution Approach 1:
The stent graft is divided into multiple radial supporting structures distributed along its length, with each structure having adjustable radial length. This segmentation allows different portions to independently adapt to local anatomical variations while collectively providing sufficient fixation force.
Solution Approach 2:
The radial supporting structures have non-uniform radial lengths, with longer structures positioned at locations requiring greater support (such as areas with calcified plaques or irregular wall shapes). This local variation in support strength allows the stent to maintain both high fixation reliability and adaptability to varying lumen geometries.
2Adaptability or versatility
If multiple stent grafts are used cooperatively to open main body and branch blood vessels, then the functional versatility is improved, but the radial supporting force distribution becomes uneven causing clearance formation
Solution Approach 1:
The radial supporting structures are designed with adjustable radial lengths that can be dynamically configured based on the specific anatomical requirements of each vessel segment. This dynamic adaptability allows the stent graft to maintain optimal contact pressure with the lumen wall regardless of whether it is used alone or in combination with other stent grafts for branch vessel开通.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The design effectively prevents type-I endoleaks by allowing blood to fill and occlude clearance spaces, ensuring secure attachment and unblocked blood flow, thereby enhancing the success rate of endovascular graft exclusion procedures.
Implementation Method 1
the radial deformability of the second radial supporting structure is greater than that of the first radial supporting structure
Data Source
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AI summary
A lumen stent (2, 42, 43, 44, 45) comprises a first tube body (21, 421, 431, 441, 451) and a second tube body (22, 422, 432, 442, 452). The second tube body (22, 422, 432, 442, 452) is sleeved outside the first tube body (21, 421, 431, 441, 451) and has at least one end in hermetic connection with the outer surface of the first tube body (21, 421, 431, 441, 451). The second tube body (22, 422, 432, 442, 452) comprises a thin film body (222) that covers at least part of the first tube body (21, 421, 431, 441,451) and a second radial supporting structure (221) that is disposed in a maximum radius-length region (L) of the thin film body (222) and surrounds the maximum radius-length region (L). The second radial supporting structure (221) has radius supporting property. After the implantation of the lumen stent (2, 42, 43, 44, 45), a semi-enclosed gap (20) can be formed between the first tube body (21, 421, 431, 441, 451) and the second tube body (22, 422, 432, 442, 452), or a semi-enclosed gap (20) can be formed between the second tube body (22, 422, 432, 442, 452) and a tube wall (12), so that blood flowing into the gap (20) can serve as filling material to block off a type I endoleak channel and prevent blood from flowing into a tumor body or an interlayer position.