Stent Graft Roughened Surface Adhesion
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Solution Overview
Problem
Existing stent grafts face challenges in achieving improved flexibility and reduced delivery profile while ensuring secure adhesion of the covering material to the base stent, which is crucial for effective implantation.
Innovation Solution
The stent graft features a base stent with a roughened surface that is partially penetrated by the covering material, forming a positive fit and enhancing adhesion. The covering material is applied either on the inside or outside of the base stent, reducing the cross-sectional area and improving flexibility and delivery profile.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the outer covering layer is reduced in thickness or arranged as a helix ribbon band, then the flexibility and delivery profile of the stent graft are improved, but the adhesion of the covering material to the base stent becomes insufficient
Solution Approach 1:
The base stent surface is roughened to create a porous/irregular topology that allows the covering material to penetrate and interlock mechanically. This porous surface structure provides anchoring points for the covering material while maintaining overall thinness and flexibility of the stent graft construction.
Solution Approach 2:
The invention combines the base stent structure with the covering material in a composite construction where the two materials work together. The roughened surface of the base stent integrates with the covering material to form a unified structure that achieves both adhesion and flexibility.
2Strength
If the covering layer is provided both on the inside and outside of the base stent, then the structural integrity is improved, but wear, fretting and fatigue occur at the junction
Solution Approach 1:
The invention extracts the covering material from one side only (either inner or outer surface) rather than applying it to both sides. This eliminates the junction between inner and outer covering layers, thereby removing the source of wear, fretting, and fatigue that would occur at such junctions.
3Reliability
If the covering material is securely attached to the base stent, then the reliability of the stent graft is improved, but the flexibility and delivery profile are reduced
Solution Approach 1:
The roughened porous surface provides secure attachment through mechanical interlocking while maintaining material efficiency. The covering material penetrates into the porous surface structure, creating strong adhesion without requiring thick layers that would compromise flexibility and delivery profile.
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 configuration enhances the adhesion of the covering material to the base stent, improves the flexibility of the stent graft, and reduces its delivery profile, making it more suitable for implantation in tortuous vessels with reduced vessel trauma.
Implementation Method 1
The base stent has a roughened surface that is at least partially penetrated by the covering material so as to form a positive fit
Data Source
Figure 1~2
AI summary
The present invention relates to a stent graft, comprising: a base stent having a first and a second longitudinal end, a lumen extending longitudinally through the base stent, a covering material provided so as to line the base stent, the base stent having a roughened surface that is at least partially penetrated by the covering material so as to form a positive fit.