Pivoting Fenestration for Dynamic Vessel Geometry
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Solution Overview
Problem
Existing endoluminal prostheses often struggle to accommodate branch vessels during surgical interventions for aneurysms or weakened vascular structures, as they may block or hinder blood flow due to insufficient accommodation for dynamic vessel geometry, requiring customization that is not always feasible.
Innovation Solution
The development of an endoluminal prosthesis with pivotable fenestrations that can adjust to accommodate branch vessels by allowing the branch vessel stent or stent-graft to pivot into various orientations, ensuring proper sealing and blood flow, using a design with an inner perimeter, a band of flexible material, and an outer perimeter that can move independently from the surface plane of the prosthesis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a prosthesis is designed with fixed fenestrations to accommodate branch vessels, then the prosthesis structure is simple and manufacturing is easier, but the prosthesis cannot adapt to dynamic vessel geometry and may block blood flow
Solution Approach 1:
The fenestration is designed with a pivoting mechanism that allows it to rotate between a first position for blood flow and a second position for sealing. This dynamic structure enables the same prosthesis to adapt to different vessel geometries and operational requirements without requiring multiple customized devices, thereby resolving the contradiction between adaptability and structural simplicity.
2Reliability
If the prosthesis is customized for each patient anatomy, then the fit and sealing are optimized, but the manufacturing complexity and time increase significantly
Solution Approach 1:
The prosthesis incorporates a universal pivoting fenestration design that can accommodate various patient anatomies and vessel configurations through a single standardized structure. The pivoting mechanism allows the fenestration to adapt to different angles and positions, eliminating the need for custom manufacturing for each patient while maintaining reliable sealing effectiveness.
3Ease of operation
If the fenestration is made fixed in position, then the prosthesis deployment is simpler and faster, but the branch vessel sealing may be compromised due to geometry changes
Solution Approach 1:
The fenestration incorporates a pivoting mechanism that allows it to rotate between a first position (for blood flow during deployment) and a second position (for sealing against the branch vessel). This dynamic capability maintains deployment simplicity while ensuring reliable sealing, as the fenestration can reposition itself to match the actual vessel geometry after deployment.
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
This solution allows for a standardized prosthesis that can adapt to various patient anatomies, reducing the need for customization and ensuring effective sealing and blood flow through branch vessels, even in cases with dynamic geometry changes.
Implementation Method 1
The band of material extending from the surface of the prosthesis is sufficiently flexible to permit the fenestration to move such that a branch stent disposed in the fenestration may be oriented upwardly, downwardly, laterally, diagonally and the like
Data Source
AI summary
The present disclosure relates to an endoluminal prosthesis, such as a stent graft that includes one or more fenestrations to accommodate endovascular disease, such as an aneurysm in cases where one or more side branches is involved. In one aspect, the prosthesis includes fenestrations that are pivotable to accommodate the dynamic geometry of the aortic branches. In another aspect, the pivotable fenestrations include a first perimeter, a band of flexible material attached and surrounding the first perimeter, and a second perimeter attached to and surrounding the band of flexible material. The first perimeter, band of flexible material, and second perimeter have a geometric shape.