Inflatable Cuff Stent Graft for Aortic Sealing
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Solution Overview
Problem
Current stent graft systems for treating aortic aneurysms face challenges in achieving accurate placement and long-term sealing, particularly due to complex anatomy and varying vessel sizes, leading to potential endoleaks and increased procedural complexity.
Innovation Solution
A stent graft system comprising a single-lumen proximal graft with an inflatable fill structure and separate limb stent grafts, featuring a wide seal ring and customizable design elements such as suprarenal laser-cut stents and polytetrafluoroethylene (PTFE) components, which improves sealing accuracy and flexibility for various aneurysm sizes and shapes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a standard endoluminal graft is used for treating aortic aneurysms, then the procedure is simpler and recovery is faster, but accurate placement and long-term sealing are difficult to achieve due to complex anatomy and varying vessel sizes
Solution Approach 1:
The graft system is divided into multiple segments: a proximal graft component with seal ring, a distal graft component, and an inflatable cuff. These segments can be separately deployed and positioned to accommodate complex anatomical variations while maintaining sealing accuracy. The segmentation allows each component to be optimized for its specific function without increasing overall system complexity excessively.
Solution Approach 2:
The inflatable cuff provides dynamic adaptability to the graft system. By inflating the cuff after deployment, the system can adjust to varying vessel sizes and anatomical configurations in real-time, ensuring accurate placement and sealing. This dynamic feature allows the static graft structure to adapt to dynamic anatomical variations without requiring multiple pre-fabricated size options.
2Adaptability or versatility
If the graft is designed to accommodate varying vessel sizes and shapes, then sealing accuracy improves, but the device design becomes more complex
Solution Approach 1:
The graft system incorporates universal features that allow it to accommodate various anatomical configurations. The inflatable cuff can be adjusted to fit different vessel diameters and shapes, while the seal ring design provides universal sealing capability across different anatomical scenarios. This multi-functionality reduces the need for multiple specialized graft designs for different anatomical types.
Solution Approach 2:
The system utilizes parameter changes through inflation pressure and volume of the cuff to adapt to varying anatomical conditions. By changing the physical parameters of the cuff (pressure, volume), the graft can accommodate different vessel sizes and shapes without requiring complex mechanical adjustments or multiple design configurations. This simplifies the overall design while maintaining high adaptability.
3Reliability
If a seal component is added to improve sealing, then endoleaks are reduced, but the procedural time and complexity increase
Solution Approach 1:
The seal ring is pre-integrated into the proximal graft component during manufacturing, eliminating the need for separate seal component installation during the procedure. The inflatable cuff is also pre-attached to the graft system, ready for deployment. These preliminary actions reduce procedural time while maintaining reliable seal formation, as the sealing components are already in their correct positions and configurations before patient intervention begins.
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 system enhances placement accuracy, reduces procedural time, and minimizes endoleaks by providing a robust design with customizable features that accommodate varying anatomies, ensuring effective sealing and sac management.
Implementation Method 1
an inflatable fill structure that expands within the aorta
Data Source
AI summary
A stent graft system includes a first graft, a second graft, and a third graft. Each of the first graft, the second graft, and the third graft forms a single lumen. When deployed, the first graft, the second graft, and the third graft are coupled together within an aorta.