Braided Stent with Alternating Wire Cross-Sections for Radial Strength
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Solution Overview
Problem
Existing stents face challenges in achieving a small compressed configuration while maintaining sufficient radial strength for body lumen support, and existing delivery systems struggle to accommodate stents with high radial strength due to difficulties in compression and potential bulging during delivery.
Innovation Solution
A stent with a braided wire body formed from alternating wires of different cross-sectional areas, combined with a delivery catheter system featuring a retractable sheath, inner catheter member, and anchor member with protrusions, allows for a reduced unexpanded profile and enhanced radial strength, enabling effective deployment through smaller catheters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a stent is made with higher radial strength to support the body lumen, then the radial strength is improved, but the stent becomes more difficult to compress into a small diameter for delivery
Solution Approach 1:
The stent is segmented into multiple struts of different thicknesses (first struts and second struts) arranged in an alternating pattern. This segmentation allows different regions of the stent to have different mechanical properties, enabling the overall structure to achieve high radial strength while maintaining compressibility for delivery.
2Strength
If a stent is made stiffer to maintain radial strength, then the radial strength is improved, but the stent can cause an undesirable bulge in the delivery system
Solution Approach 1:
The stent employs local quality by varying the thickness of individual struts rather than using a uniform thickness throughout. Thinner struts reduce the overall profile and prevent bulging during delivery, while thicker struts provide localized radial strength where needed to support the body lumen.
3Ease of operation
If a stent is compressed to a smaller diameter for easier delivery, then the ease of delivery is improved, but the radial strength may be compromised
Solution Approach 1:
The stent design allows for dynamic behavior during delivery and deployment. The alternating thick and thin struts enable the stent to be compressed to a small diameter for delivery, then dynamically expand to its full radial strength configuration once deployed in the body lumen, providing both ease of delivery and adequate support.
Data Source
Figure 1
Figure 2
Figure 3A~3B
AI summary
A stent has a braided wire body formed from at least a first wire and a second wire. The first wire has a first cross-sectional area and the second wire has a second cross-sectional area different from the first cross-sectional area. The proximal end of the braided wire body has a plurality of peaks, the peaks including first peaks and first loop ends. The first loop ends alternate circumferentially with the first peaks and the first loop ends extend proximally beyond the first peaks.