Multibranch Stent Graft Deployment via Pre-cannulated Fenestrations
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Solution Overview
Problem
Current endovascular repair procedures for aneurysms, particularly those involving vascular bifurcations, face challenges in accurately deploying stent grafts due to the complexity of anatomical passages and the need for modular components, which can complicate the surgical process and increase risks for patients.
Innovation Solution
The development of a multibranch stent graft system with side branch portals and a method for deployment that involves advancing a main guidewire, catheter, and sheaths to facilitate precise placement and expansion of the stent graft within the vascular lumen, allowing for independent deployment of side branch bodies and the use of embolic filters for emboli protection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a modular stent graft with separate main body and branch components is used, then the ease of deployment is improved, but the device complexity increases
Solution Approach 1:
The stent graft is divided into separate modular components including a main body stent and branch stents that can be deployed independently. The main body stent includes fenestrations that receive branch stents, allowing sequential deployment while maintaining structural integrity. This segmentation enables easier deployment in complex anatomies while the integrated fenestration design controls the overall device complexity.
Solution Approach 2:
The branch stents are designed to be nested within the fenestrations of the main body stent. The delivery system allows the branch stents to be positioned and deployed through the fenestrations of the main body stent, creating a nested configuration that simplifies the deployment process while managing device complexity through hierarchical structuring.
2Adaptability or versatility
If the stent graft is deployed in a vascular bifurcation, then the adaptability to anatomical variations is improved, but the manufacturing precision requirements increase
Solution Approach 1:
The bifurcated stent graft is constructed as separate modular components (main body stent and branch stents) that can be independently manufactured with standard precision tolerances. The main body stent includes pre-formed fenestrations that guide branch stent placement, allowing anatomical adaptation through modular assembly rather than requiring single-piece manufacturing of complex bifurcated geometries.
Solution Approach 2:
The main body stent features localized fenestrations with specific geometries tailored to match the intended branch vessel anatomy. These fenestrations are precisely positioned and sized to accommodate specific branch stent designs, providing local customization for anatomical adaptation while maintaining standard manufacturing precision for the overall device components.
3Ease of operation
If pre-cannulated portals are used for side branch access, then the ease of operation is improved, but the device complexity increases
Solution Approach 1:
The side branch portals are pre-cannulated during the stent graft manufacturing process, with guide wires or catheters预先 positioned through the fenestrations. This preliminary action eliminates the need for complex real-time navigation during deployment, as the access paths are already established. The pre-cannulated structure provides simple, intuitive guidance for branch stent delivery while the modular design keeps overall device complexity manageable.
Data Source
AI summary
A method of deploying a multibranch stent graft at a target site having a main lumen and a first branch lumen is provided. The method includes advancing a catheter including a main body having a first portion and a second portion, the main body defining a first portal being pre-cannulated with a first guide member, partially deploying the first portion of the main body, advancing a first sheath along the first guide member through the first portal, advancing a first articulatable wire through the first sheath, positioning the first articulatable wire into a first branch lumen of the target site, partially deploying the second portion of the main body, fully deploying the first portion and the second portion of the main body, advancing a first side branch body along the first articulatable wire into the first branch lumen, and deploying the first side branch body in the first branch lumen.