Stent Strut Bending Strength for Uniform Vessel Adherence
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Solution Overview
Problem
Stents formed by connecting loop stents with struts often experience uneven bending due to differences in bending strength between the struts and the stent main wires, leading to non-uniform shape maintenance and poor adherence to curved blood vessel walls.
Innovation Solution
The stent design features loop stents connected via struts with a bending strength greater than the stent main wires, ensuring uniform bending across the stent, achieved by using materials like austenitic stainless steel with varying processing rates to match the bending strengths of the struts and stent main wires.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the same material is used for both struts and stent main wires, then the manufacturing process is simplified, but the bending strength becomes insufficient in struts causing non-uniform bending
Solution Approach 1:
The patent applies different materials to different parts of the stent structure. Specifically, the struts are made from a first material with higher bending strength, while the loop stents are made from a second material. This local differentiation ensures that the struts have sufficient bending strength to maintain the stent's shape during deployment and application, while the loop stents provide flexibility for conforming to vessel geometry.
2Stability of the object's composition
If struts have high bending strength, then the stent maintains its shape well, but the struts do not bend uniformly with the loop stents when applied to curved surfaces
Solution Approach 1:
The patent carefully controls the bending strength parameter of the strut material to be higher than that of the stent main wire material, but not excessively so. This parameter optimization ensures that the struts have sufficient strength to prevent collapse while maintaining the ability to bend uniformly with the loop stents when applied to curved blood vessel surfaces, achieving both shape stability and conformability.
3Adaptability or versatility
If the stent is made more flexible to conform to curved surfaces, then the adherence to blood vessel walls improves, but the ability to maintain stent shape during deployment decreases
Solution Approach 1:
The patent implements local quality differentiation by using a first material for struts with higher bending strength and a second material for loop stents with lower bending strength. This allows the loop stents to be more flexible and conformable to curved vessel surfaces, while the struts provide the necessary structural support to maintain the overall stent shape during deployment and prevent collapse.
Data Source
AI summary
A stent including a plurality of loop stents connected by struts so that it bends uniformly as a whole.A stent A including a plurality of loop stents 2 connected by a plurality of struts 3, the loop stents 2 each formed of a stent main wire 1 folded into a zigzag shape and joined at its ends, wherein the bending strength of each strut 3 is larger than the bending strength of the stent main wire 1.