Vascular Stent with Protruding Section for Aneurysm Stabilization
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Solution Overview
Problem
Current implantable devices for treating aneurysms lack effective solutions for stabilizing embolic material within the aneurysm while ensuring unobstructed blood flow to efferent vessels, particularly at bifurcations, where aneurysms can rupture and cause serious health consequences.
Innovation Solution
A vascular stent design with a proximal, distal, and protruding section, where the protruding section expands to abut the aneurysm ostium, providing scaffolding to inhibit dislodgment of objects and allowing perfusion to efferent vessels, with a strut pattern and material configuration that allows for self-expansion and varying cross-sectional dimensions to accommodate the aneurysm's shape.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a stent is designed to anchor in afferent and efferent vessels at a bifurcation, then the stent can stabilize the vascular structure and prevent aneurysm rupture, but the stent may obstruct blood flow to efferent vessels
Solution Approach 1:
The stent is divided into multiple sections: a proximal section for anchoring in the afferent vessel, a distal section for anchoring in efferent vessels, and an intermediate section connecting them. This segmentation allows each section to perform its specific function while maintaining overall structural integrity and blood flow patency.
Solution Approach 2:
Different sections of the stent have different structural characteristics optimized for their specific locations. The proximal section has a configuration optimized for anchoring in the afferent vessel, while the distal section has configurations optimized for efferent vessels, allowing localized adaptation to maintain blood flow while providing stabilization.
2Ease of manufacture
If the stent uses a uniform strut pattern throughout, then manufacturing is simplified, but the stent cannot accommodate the varying anatomical requirements at different locations
Solution Approach 1:
The stent is constructed with multiple sections that can have different strut patterns, densities, and geometries. This allows each section to be optimized for its specific anatomical location while still being manufactured as an integrated structure using techniques such as selective laser melting or other additive manufacturing processes.
Solution Approach 2:
The stent incorporates varying strut patterns in different sections: denser patterns in areas requiring higher mechanical support and more open patterns in areas requiring enhanced blood flow. This local differentiation allows the stent to accommodate varying anatomical requirements while maintaining manufacturability through modern fabrication techniques.
3Adaptability or versatility
If the stent is designed with expandable sections, then the stent can adapt to the aneurysm's shape and size, but the device complexity increases
Solution Approach 1:
The stent incorporates expandable sections that can transition from a compressed delivery configuration to an expanded deployed configuration. This dynamic capability allows the stent to adapt to the three-dimensional geometry of the aneurysm and surrounding vasculature, providing customized support where needed while maintaining a simple delivery profile.
Solution Approach 2:
The stent is designed to be delivered in a compressed, nested configuration within a catheter, then expanded to its functional three-dimensional shape at the target site. This nesting approach allows a complex three-dimensional structure to be delivered through a simple catheter, reducing device complexity during delivery while maintaining adaptability at the implantation site.
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 stent effectively stabilizes embolic material within the aneurysm, reduces the risk of rupture, and maintains unobstructed blood flow to efferent vessels, thereby preventing serious health consequences associated with aneurysm rupture.
Implementation Method 1
the protruding section (i) being configured to abut an ostium of the aneurysm when the protruding section is positioned at the bifurcation, (ii) defining an intermediate lumen in fluid communication with the proximal and distal lumens
Implementation Method 2
the proximal, distal and protruding sections are expandable from a compressed configuration to an expanded configuration
Implementation Method 3
at least one of the proximal, distal, and protruding sections is self-expandable
Implementation Method 4
defining an intermediate lumen in fluid communication with the proximal and distal lumens
Data Source
AI summary
Described herein are flexible implantable devices or stents that can conform to the shape of vessels of the neurovasculature. In some embodiments, the devices can direct blood flow within a vessel away from an aneurysm or limit blood flow to the aneurysm. In some embodiments, a vascular remodeling device includes a first section and a protruding section. During deployment, the device expands from a compressed configuration to an expanded configuration. The first section anchors the device in an afferent vessel and/or in an efferent vessel of a bifurcation and the protruding section is positioned in the junction of the bifurcation having an aneurysm and across the neck of the aneurysm or at least partially within the aneurysm.