Braided Stent Expansion Rings Radial Force
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Solution Overview
Problem
Existing self-expanding braided stents face challenges in neurovascular procedures due to low radial expansion forces, stent migration, and difficulty in accurate placement, especially in tiny vessels like those in the brain, where they struggle to provide selective reinforcement and minimize trauma to the blood vessel.
Innovation Solution
A braided stent system with expansion rings at both ends, formed from interconnected elongate members, which impart outward radial forces to the braid, allowing for secure attachment and increased radial expansion, facilitating accurate deployment and minimizing trauma to the vessel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If single wire braided stents are used, then lower crimp profiles and lower tracking forces are achieved, but radial expansion forces are very low resulting in stent migration and difficulty in accurate placement
Solution Approach 1:
The patent combines multiple structural elements (braided wire framework, expansion rings, and elongate members) into a unified stent system. The expansion rings with elongate members are integrated with the braided stent structure to collectively provide enhanced radial expansion force while maintaining the flexibility and low profile characteristics of the original braided design.
Solution Approach 2:
The stent is divided into functional segments: the braided wire framework provides flexibility and low profile, while separate expansion rings with elongate members provide concentrated radial expansion force at specific locations. This segmentation allows each component to optimize its function without compromising the others.
2Adaptability or versatility
If self-expanding braided stents are used in neurovascular procedures, then the stent can be deployed in tiny vessels, but the low radial expansion forces cause stent migration and difficulty in accurate placement
Solution Approach 1:
The patent applies different structural qualities to different parts of the stent system. The braided framework maintains uniform flexibility throughout for navigation through tiny vessels, while localized expansion rings with elongate members provide concentrated radial force at specific segments to ensure stability and prevent migration in the neurovascular environment.
3Reliability
If conventional stents are used to reinforce artery walls, then restenosis is prevented, but trauma or risk of rupture to the blood vessel increases
Solution Approach 1:
The stent system employs dynamic expansion through the elongate members that can progressively exert radial force on the vessel wall. This dynamic mechanism allows the stent to adapt to the vessel's elasticity and gradually reinforce the artery wall without causing sudden trauma or rupture, while still effectively preventing restenosis.
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
The enhanced radial expansion force and secure attachment mechanism improve the accuracy and effectiveness of stent deployment in neurovascular treatments, reducing the risk of stent migration and vessel trauma.
Implementation Method 1
Each expansion ring can include a frame that imparts an outwardly expanding radial force to the braid
Data Source
AI summary
An endovascular self-expanding stent system that can include a braid with a proximal end, a distal end, and a lumen formed therebetween. The braid can be formed from one or more wires woven to comprise interstices. A first expansion ring can be connected to the proximal end of the braid. A second expansion ring can be connected to the distal end of the braid. Each expansion ring can include a frame that imparts an outwardly expanding radial force to the braid. The frame can include a plurality of elongate members interconnected by one or more intersections.