Endovascular Stent Gate Joining Liner for Leakage Control
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Solution Overview
Problem
Current endovascular stent grafts face challenges in securely joining implants to the gate structure, particularly in regions with vessel bifurcations, leading to potential leakage and reduced structural integrity, especially when dealing with aneurysms in the thoracic aorta and its branches.
Innovation Solution
The use of a joining liner with a bunched or crumpled state that is radially expanded by the implant to form a joint, providing a seal and increased strength without significantly reducing the lumen volume, and utilizing materials like woven polyester terephthalate or polytetrafluoroethylene for the liner and graft, with joints formed by stitching, sutures, or melted/solidified mixtures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a traditional joining method is used to connect the implant to the gate, then the structural integrity may be maintained, but leakage risks increase and the sealing performance deteriorates
Solution Approach 1:
The joining liner acts as an intermediary component between the implant and the gate structure. It is joined to the internal surface of the gate and receives the implant, creating a sealed interface that prevents leakage while distributing mechanical stresses. The liner material (woven polyester terephthalate or polytetrafluoroethylene) provides both sealing and structural functions that neither the implant nor gate can achieve alone.
Solution Approach 2:
The joining liner is implemented as a flexible thin-walled structure that can deform to accommodate the expansion of the implant from compressed to expanded state. This flexibility allows the liner to conform to the gate surface and create effective seals, while the material properties (woven polyester terephthalate or polytetrafluoroethylene) provide sufficient strength to maintain structural integrity under physiological conditions.
2Reliability
If the joining liner is made from expensive material, then the sealing and structural integrity improve, but the manufacturing cost increases
Solution Approach 1:
The joining liner uses specialized materials (woven polyester terephthalate or polytetrafluoroethylene) only at the critical gate interface where sealing and structural integrity are most needed. The liner is joined to the internal surface of the gate at specific locations, providing enhanced reliability only where required rather than throughout the entire implant structure, thus optimizing the balance between performance and cost.
3Reliability
If the implant is expanded to exert radial force on the joining liner, then the sealing performance improves, but the lumen volume may be reduced
Solution Approach 1:
The joining liner is designed as a thin-walled flexible structure that can deform under radial force from the expanded implant without significantly reducing the internal lumen volume. The liner material (woven polyester terephthalate or polytetrafluoroethylene) and its configuration allow it to conform to the implant shape while maintaining adequate blood flow passage, achieving sealing without excessive lumen compromise.
Data Source
AI summary
An endovascular stent graft. The endovascular stent graft includes a body including a gate having an internal surface, a joining liner joined to the internal surface of the gate with a joint and having a bunched state and a crumpled state, and an implant at least partially disposed within the joining liner and having a radially compressed state and a radially expanded state. The implant in the radially expanded state exerts a radial force on the joining liner to maintain the joining liner in the crumpled state.