Variable Zone Stent for Branch Vessel Perfusion and Aneurysm Exclusion
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Solution Overview
Problem
Conventional stent-grafts for treating intra-vascular diseases require custom fabrication and precise deployment to align side openings with branch vessels, making them expensive, time-consuming, and complex to implement, increasing the risk of procedural complications.
Innovation Solution
A variable zone high metal to vessel ratio stent with a proximal high metal to vessel ratio zone for fixation and sealing, a central low metal to vessel ratio zone for perfusion of branch vessels, and a distal high metal to vessel ratio zone for aneurysm exclusion, integrated into a single piece for simplified deployment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If custom side openings are fabricated to accommodate individual patient vessel structures, then the stent-graft can be precisely aligned with branch vessels, but the fabrication becomes expensive and time-consuming
Solution Approach 1:
The stent-graft incorporates zones with different metal-to-vessel ratios: high metal-to-vessel ratio zones for fixation and sealing, and low metal-to-vessel ratio zones for perfusion. This local differentiation allows the device to provide both secure anchoring and controlled blood flow to branch vessels through the same integrated structure, eliminating the need for custom side openings while maintaining precise alignment capabilities.
Solution Approach 2:
The variable zone stent-graft design provides multiple functions within a single device: proximal and distal high metal-to-vessel ratio zones provide fixation and sealing, while the central low metal-to-vessel ratio zone provides perfusion to branch vessels. This multi-functionality eliminates the need for separate custom-fabricated components and simplifies the deployment procedure.
2Manufacturing precision
If custom side openings are precisely aligned with branch vessels during deployment, then proper perfusion is achieved, but the procedure becomes complex and time-consuming
Solution Approach 1:
The invention merges the fixation function and perfusion function into a single integrated stent-graft structure. The high metal-to-vessel ratio zones provide fixation and sealing while the low metal-to-vessel ratio zone provides perfusion, eliminating the need for separate alignment procedures and reducing deployment complexity to a single operation.
Solution Approach 2:
The stent-graft utilizes parameter changes in metal-to-vessel ratio along its length to achieve different functions. By varying this parameter from high to low and back to high, the device automatically adapts to provide fixation, sealing, and perfusion without requiring complex deployment alignment procedures.
3Productivity
If a single integrated stent design is used, then deployment time and complexity are reduced, but the ability to provide both fixation and perfusion functions simultaneously is compromised
Solution Approach 1:
The single integrated stent-graft incorporates local quality variations through different metal-to-vessel ratio zones. The proximal and distal high metal-to-vessel ratio zones provide fixation and sealing functions, while the central low metal-to-vessel ratio zone provides perfusion function, allowing the device to perform multiple functions simultaneously within a unified structure that deploys in a single operation.
Data Source
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AI summary
A variable zone high metal to vessel ratio stent includes a proximal high metal to vessel ratio zone, a central low metal to vessel ratio zone, and a distal high metal to vessel ratio zone. The proximal high metal to vessel ratio zone is deployed with fixation and sealing to healthy tissue of a main vessel superior to branch vessels and an aneurysm. The central low metal to vessel ratio zone is deployed directly on ostai of the branch vessels. However, as the central low metal to vessel ratio zone is highly permeable, blood flows from the main vessel through the central low metal to vessel ratio zone and into branch vessels.