Helicoidally Braided Stent With Platinum Alloy Even Strands
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Stents formed by helicoidally braiding strands made of materials like stainless steel, Co—Cr alloy, and Ni—Ti alloy are not visible under X-ray, making it difficult to confirm their implantation position, while using platinum alloy strands degrades the stent's extending performance, especially when their number is odd.
Innovation Solution
The stent is formed by helicoidally braiding strands with some even-numbered strands made of platinum-iridium alloy, ensuring two strands are used in the same winding direction to maintain even extension and visibility under X-ray.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If a platinum alloy material is used for stent strands to improve X-ray visibility, then the stent becomes visible under X-ray, but the extending performance deteriorates
Solution Approach 1:
The stent is divided into multiple strands, with only specific even-numbered strands made of platinum alloy material while other strands are made of different materials. This segmentation allows the stent to have both X-ray visible portions (platinum strands) and structurally sound portions (other materials), resolving the contradiction between visibility and extending performance.
Solution Approach 2:
Different portions of the stent have different material properties: even-numbered strands use platinum alloy material for X-ray visibility, while odd-numbered strands use other materials for structural integrity. This local differentiation of material quality allows simultaneous achievement of visibility and extending performance.
2Loss of information
If an odd number of platinum alloy strands is used to ensure X-ray visibility, then the stent becomes visible, but the extension evenness deteriorates
Solution Approach 1:
The patent deliberately creates an asymmetric distribution of platinum alloy strands by using only even-numbered strands (2, 4, 6, etc.) rather than all strands or an odd number of strands. This asymmetric configuration ensures even extension while maintaining visibility through the presence of platinum strands.
Solution Approach 2:
Instead of using all strands or an odd number of platinum alloy strands, the patent uses only the even-numbered strands (partial action). This partial application of platinum alloy material is sufficient for X-ray visibility while avoiding the extension problems associated with odd numbers or full application.
Data Source
AI summary
Some of strands of a stent are disposed using a strand made of a platinum alloy material. In the stent (10) formed by helicoidally braiding a plurality of strands, some even-numbered strands among the plurality of strands are disposed using a platinum alloy material.