Multi-lumen Stent Graft Segmentation for Endoleak Prevention
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Solution Overview
Problem
Current stent grafts for treating aortic aneurysms and dissections are prone to endoleaks and displacement, complicating surgical procedures and reducing their adaptability for various vascular conditions.
Innovation Solution
A multi-lumen stent graft design featuring a tubular main body stent with separate lumens and a connection stent graft that can be fitted and connected to accommodate different branch vessel configurations, reducing the risk of endoleaks and improving surgical simplicity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional stent grafts are used for aortic aneurysm treatment, then the procedure is simpler, but the risk of endoleaks and displacement increases
Solution Approach 1:
The stent graft is divided into multiple segments including a main body stent with separate lumens for different vessels and connection stents that can be independently positioned. This segmentation allows each component to be optimized for its specific function, improving overall reliability while managing complexity through modular design
Solution Approach 2:
The design employs nested structures where connection stents are positioned within or adjacent to the main body stent lumens, creating a hierarchical arrangement. The separation coverings and internal structures are nested within the overall stent framework, allowing compact deployment while maintaining functional independence of each component
2Adaptability or versatility
If custom stent configurations are created for different branch vessels, then adaptability to individual anatomy improves, but surgical complexity and time increase
Solution Approach 1:
The main body stent is designed with multiple lumens that can accommodate different branch vessels (carotid, subclavian, etc.), making a single device capable of addressing multiple anatomical variations. The connection stents can be selectively positioned in different lumens based on patient anatomy, providing universal adaptability without requiring completely custom designs for each case
Solution Approach 2:
The stent graft system incorporates dynamic positioning capabilities where connection stents can be selectively deployed in different lumens and configurations based on the patient's specific anatomy. The separation coverings can be adjusted to create different lumen configurations, allowing the device to adapt dynamically to various vascular arrangements during the procedure
3Reliability
If multiple stents are deployed simultaneously for branch vessel coverage, then complete vascular coverage is achieved, but interference between stents causes blood flow disturbance
Solution Approach 1:
The vascular coverage is segmented into separate lumens, each dedicated to a specific branch vessel. This spatial segmentation prevents interference between stents by providing dedicated pathways for each vessel, ensuring complete coverage while eliminating blood flow disturbance caused by stent interaction
Solution Approach 2:
The design transitions from a single-plane stent deployment to a multi-dimensional lumen structure. By creating separate spatial dimensions (lumens) for different branch vessels, the system achieves complete vascular coverage while preventing harmful interactions through dimensional separation
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 multi-lumen stent graft design enhances surgical precision and adaptability, reducing the risk of complications and improving outcomes for patients with aortic arch aneurysms and dissections by allowing for tailored fitment to individual vascular anatomy.
Implementation Method 1
Due to the elastic force of the metal wire stent, it is automatically restored to a straight tube and is closely attached to the inner wall of the aorta
Data Source
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AI summary
A multi-lumen stent graft including a tubular main body stent graft and a tubular connection stent graft; the main body stent graft includes a tubular main body stent; the main body stent includes a tubular main body covering and a main body support frame fixed on a wall of the main body covering; a main lumen and at least one sub lumen are separated axially by a separation covering within the main body stent; in a released state, a proximal end of the connection stent graft and the main lumen at a distal end of the tubular main body stent graft are fitted and connected together. The multi-lumen stent graft is not prone to endoleaks and displacement, which can simplify surgical operations, reduce the difficulty and risk of surgery, and has a wide range of applications.