Variable-Porosity Stent Orientation for Aneurysm Flow Diversion
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Solution Overview
Problem
Existing flow diversion stents have a uniform porosity profile that can negatively affect blood flow in regions where diversion is not necessary, leading to complications in nearby branch arteries.
Innovation Solution
A stent with a variable porosity profile, allowing for selective orientation of low porosity flow diversion sections and high porosity sections, enabling customizable delivery to address specific vascular conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a uniform low porosity profile is used throughout the stent, then flow diversion into the aneurysm is improved, but blood flow into adjacent branch arteries is reduced causing complications
Solution Approach 1:
The stent implements different porosity characteristics in different longitudinal sections. The proximal section has a first porosity profile optimized for flow diversion into the aneurysm, while the distal section has a second porosity profile that maintains adequate blood flow to branch arteries. This local differentiation allows each section to perform its specific function without compromising the other.
Solution Approach 2:
The stent is divided into distinct functional segments along its length. The proximal portion serves as the flow diversion interface for aneurysm treatment, while the distal portion serves as a transition zone that preserves normal blood flow to adjacent vessels. This segmentation enables independent optimization of each region's porosity characteristics.
2Ease of manufacture
If a constant porosity profile is maintained across the entire stent length, then manufacturing simplicity is improved, but adaptability to different vascular regions is reduced
Solution Approach 1:
The stent incorporates longitudinally varying porosity profiles with distinct sections having different porosity characteristics. The proximal section features a first porosity profile for effective flow diversion, while the distal section features a second porosity profile for maintaining normal blood flow, allowing customization to specific vascular anatomies and pathologies.
3Device complexity
If the stent is delivered in a fixed configuration, then delivery mechanism simplicity is improved, but the ability to optimize flow diversion orientation is reduced
Solution Approach 1:
The stent delivery system allows for dynamic reorientation of the stent along its longitudinal axis during deployment. The ability to rotate or reposition the stent enables the operator to align the low porosity flow diversion section with the aneurysm neck while the high porosity section covers adjacent branch arteries, optimizing treatment effectiveness for the specific vascular anatomy.
Data Source
AI summary
A vascular prosthesis (e.g., stent), and packaging and delivery system to selectively deliver a vascular prosthesis are described. In some embodiments, the vascular prosthesis utilizes a low porosity and high porosity section, and the packaging and delivery system allows the prosthesis to be delivered such that the position of the low porosity and high porosity sections of the prosthesis can vary.