Dual-Angle Mesh Stent Structure to Reduce Deployment Shortening
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Solution Overview
Problem
Conventional stents experience a shortening phenomenon during deployment in lumens, leading to improper seating at lesion sites and reduced functionality, due to their dense mesh structure with large longitudinal and small circumferential intersection angles, which complicates deployment and may result in recurring stenosis.
Innovation Solution
A stent with a mesh structure featuring A-type diamond patterns in the central portion and B-type diamond patterns in the end portions, where the central portion has a larger intersection angle (90 degrees) for expansion force and the end portions have a smaller angle (54 degrees) to minimize shortening and maintain expansion force, is manufactured using a jig with differently arranged pins.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If a stent is manufactured with a dense mesh structure having a large longitudinal intersection angle and a small circumferential intersection angle to secure expansion force, then expansion force is improved, but a shortening phenomenon occurs during deployment
Solution Approach 1:
The stent employs different mesh structures in different regions: the central portion (where expansion force is needed) has a first mesh structure with larger intersection angles, while the end portions (where shortening occurs) have a second mesh structure with smaller intersection angles. This local differentiation allows the central portion to provide expansion force while the end portions minimize shortening phenomenon.
2Reliability
If a stent is manufactured with a dense mesh structure to maintain performance, then expandability and stability are improved, but adaptability to lumen bending is reduced
Solution Approach 1:
The stent employs different mesh structures in different regions: the central portion (where expansion force is needed) has a first mesh structure with larger intersection angles, while the end portions (where shortening occurs) have a second mesh structure with smaller intersection angles. This local differentiation allows the central portion to provide expansion force while the end portions minimize shortening phenomenon.
3Force
If the intersection angle in the longitudinal direction is increased to secure expansion force, then expansion force is improved, but the shortening phenomenon is exacerbated
Solution Approach 1:
The stent employs different mesh structures in different regions: the central portion (where expansion force is needed) has a first mesh structure with larger intersection angles, while the end portions (where shortening occurs) have a second mesh structure with smaller intersection angles. This local differentiation allows the central portion to provide expansion force while the end portions minimize shortening phenomenon.
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
This design reduces the shortening phenomenon, allows for precise seating at lesion sites, minimizes contact movement, and ensures smooth blood or food flow by maintaining expansion force and flexibility, thereby facilitating effective stent deployment and reducing the risk of lesion damage.
Implementation Method 1
a stent is a cylindrical mesh structure and has an autonomous elastic force so as to contract when an external force is applied and to expand when the external force is removed
Data Source
Figure 1(A)~1(B)
Figure 2
Figure 3
AI summary
A stent and a method for manufacturing the stent are disclosed. A stent according to an embodiment of the present invention is manufactured by using a jig having a cylindrical body on which a plurality of pins (P) are arranged in the circumferential direction (X) and the lengthwise direction (Y). The stent has a cylindrical structure, in which a wire member forms a zigzag pattern woven in the circumferential direction (X) with a predetermined width through the pins on the jig and a plurality of zigzag patterns formed in the circumferential direction (X), intersecting with one another, are arranged in the lengthwise direction with predetermined intervals (W) therebetween, forming a mesh structure with a rhombus pattern. The cylindrical structure has a dual-pattern structure, in which a first crossing angle of an A-type rhombus pattern formed at the central portion in the lengthwise direction (Y) is greater than a second crossing angle of a B-type rhombus pattern formed at opposite end portions of the structure in the lengthwise direction (Y).