Endoluminal Prosthesis Folded Section Slit Valve Access
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Solution Overview
Problem
Current endoluminal prostheses face challenges in accessing and sealing blind vessels, such as the internal iliac artery, during minimally invasive procedures, due to the lack of practical entry points, which complicates the deployment of endovascular stent grafts and can lead to leaks.
Innovation Solution
The endoluminal prosthesis features a folded section with a slit valve arrangement positioned between stent apices on its exterior surface, allowing access to the lumen while preventing leaks, and is joined to the graft using sutures, enabling deployment into blind vessels by creating a contiguous stent graft structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a conventional endoluminal prosthesis is deployed without a valve arrangement, then the deployment process is simpler, but access to blind vessels is impossible and leaks cannot be prevented
Solution Approach 1:
The prosthesis is divided into multiple sections including a folded section with a valve arrangement. This segmentation allows the valve to be positioned specifically in the folded section where it can seal against the graft, enabling access to blind vessels while maintaining overall system functionality.
Solution Approach 2:
The valve arrangement acts as an intermediary component between the folded section and the graft. It provides a controlled interface that allows catheters to pass through while preventing leaks, serving as a mediator that reconciles the need for access with the need for sealing.
2Reliability
If the folded section is joined to the graft without a valve arrangement, then the structure is simpler, but leaks into the prosthesis cannot be prevented
Solution Approach 1:
The valve arrangement is pre-positioned in the folded section before final deployment. This preliminary placement ensures that the valve is correctly positioned to seal against the graft, preventing leaks from occurring during the deployment process and ensuring reliable sealing.
Solution Approach 2:
The folded section, which creates a potential weakness point in the structure, is converted into a beneficial feature by positioning the valve arrangement within it. The fold creates a natural sealing zone that, when combined with the valve, transforms a potential leak path into a controlled access point that prevents leaks.
3Adaptability or versatility
If the prosthesis is deployed without a folded section and valve arrangement, then the device structure is simpler, but endoluminal devices cannot be introduced into previously inaccessible vessels
Solution Approach 1:
The folded section with valve arrangement serves multiple functions: it provides access to blind vessels, prevents leaks, and maintains the structural integrity of the prosthesis. This multi-functional design allows a single component to address multiple requirements, enhancing versatility without proportionally increasing complexity.
Solution Approach 2:
The folded section introduces a dimensional change by creating a folded configuration within the prosthesis structure. This fold creates a new spatial dimension that allows the valve to be positioned at a specific location, enabling access to vessels that would otherwise be inaccessible from the linear prosthesis structure.
Data Source
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AI summary
The present embodiments provide a stent graft having a tubular configuration defining a lumen therethrough, the stent graft having a proximal section and a distal section. A folded section is positioned between the proximal section and the distal section. The folded section includes a first fold directed toward the distal end and engaged with the proximal section and a second fold directed toward the proximal end and engaged with the distal section. A valve arrangement is positioned in at least one of the first and second folds providing access from an exterior of the graft to the interior of the stent graft for insertion of an additional device.