Coaxial Lattice Stent for Aneurysm Treatment
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional stents for treating aneurysms have complex braided structures that increase stiffness, reduce flexibility, and make it difficult to deliver them into small vessels, leading to potential rupture or dislocation, and they impede blood flow in a way that can cause further damage to the aneurysm wall.
Innovation Solution
A medical device with a tubular body featuring separate coaxial lattice structures connected at punctiform points, allowing relative movement and reducing the cross-sectional diameter in the compressed state, enhancing crimpability and flexibility while maintaining position, and influencing blood flow to prevent aneurysm rupture.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the stent uses a complex braided structure with interwoven wire layers to treat aneurysms, then the fine mesh improves aneurysm treatment effectiveness, but the cross-sectional diameter in compressed state increases making delivery into small vessels difficult
Solution Approach 1:
The stent wall is segmented into multiple independent lattice layers (first lattice layer, second lattice layer, etc.) that are not interwoven but arranged coaxially. Each layer maintains its structural integrity independently while collectively providing the required fine mesh for aneurysm treatment. This segmentation allows the stent to achieve the desired fine mesh structure without the space-consuming interweaving of traditional braided designs, thereby reducing the compressed cross-sectional diameter for easier delivery into small vessels.
Solution Approach 2:
The multiple lattice layers are nested coaxially one inside another, with each layer positioned within the circumference of the previous layer. This nesting arrangement allows the stent to maintain a compact cross-sectional profile when compressed for delivery, while still providing the fine mesh structure needed for effective aneurysm treatment. The nested configuration minimizes the overall cross-sectional diameter compared to interwoven braided structures.
2Reliability
If the stent uses a complex braided structure with interwoven wire layers, then the fine mesh improves aneurysm treatment effectiveness, but the flexibility of the stent decreases
Solution Approach 1:
The stent structure is divided into multiple independent lattice layers that can move relative to each other. This segmentation allows each layer to flex and deform independently in response to vessel curvature and movement, thereby maintaining or even enhancing overall stent flexibility compared to rigid interwoven braided structures. The independent layers can adapt to vessel geometry changes without the constraint of fixed interweaving patterns.
Solution Approach 2:
The lattice layers are connected by punctiform connections rather than continuous interweaving, allowing dynamic relative movement between layers. This dynamic structure enables the stent to adapt flexibly to vessel curvature and physiological movements while maintaining the fine mesh structure required for effective aneurysm treatment. The punctiform connections permit the layers to slide and adjust relative positions, enhancing overall flexibility.
3Reliability
If the stent uses a complex braided structure with interwoven wire layers, then the fine mesh improves aneurysm treatment effectiveness, but the device complexity increases
Solution Approach 1:
The complex braided structure is replaced by segmented independent lattice layers. Instead of continuously interweaving wires across multiple layers, each layer is constructed as a separate lattice structure with its own pattern. This segmentation simplifies the manufacturing process and structural analysis while maintaining the fine mesh characteristics necessary for effective aneurysm treatment. The independent layers can be manufactured separately and then assembled, reducing overall device complexity.
Solution Approach 2:
Each lattice layer can have locally optimized properties, with different mesh sizes, wire diameters, or patterns in different sections of the stent. This local quality approach allows customization of the stent structure to match specific aneurysm characteristics and vessel geometries without requiring a uniformly complex braided structure throughout. The punctiform connections between layers provide localized coupling while allowing independent optimization of each layer's local properties.
Data Source
AI summary
A medical device, having a body that is tubular at least in some sections. The body can be transferred from a compressed state into an expanded state and has a circumferential wall having at least one first lattice structure and one second lattice structure. The first lattice structure and the second lattice structure form separate layers of the circumferential wall, which are arranged coaxially one inside the other and connected to each other at least at points in such a way that the first lattice structure and the second lattice structure can be moved relative to each other at least in some sections. A system having such a device is also disclosed.