Low-Profile Stent Graft Attachment for Small-Diameter Delivery
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Solution Overview
Problem
Existing endovascular stent graft systems face challenges in achieving a small enough profile for safe and reliable deployment due to the presence of a full metal ring at one end, making it difficult to compress and deploy through tortuous anatomy.
Innovation Solution
The use of a reduced size attachment flap with discrete ring members and securement tethers or hooks allows for secure attachment of the stent to the graft without a full attachment ring, enabling compression to a diameter of 9 to 15 French, facilitating safe and accurate implantation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a full metal ring is used at one end of the graft to secure the stent, then securement of the stent to the graft end is achieved, but the stent graft cannot be compressed to a small size for delivery
Solution Approach 1:
The attachment ring is divided into discrete segments or points of attachment rather than a continuous full ring. This segmentation allows the structure to be compressed to a smaller diameter for delivery while maintaining securement capability at the discrete attachment points, resolving the contradiction between strength and compressed size.
Solution Approach 2:
The invention extracts or removes portions of the traditional full attachment ring, retaining only the essential attachment points needed for securement. This extraction reduces the overall size and compression difficulty while preserving the necessary functional capability to attach the stent to the graft end.
2Reliability
If a full attachment ring is used to secure the stent, then reliable securement is achieved, but the profile remains too large for safe and reliable deployment through tortuous anatomy
Solution Approach 1:
The attachment ring is segmented into discrete points or segments that can be compressed together, reducing the overall profile size to fit through tortuous anatomy while maintaining reliable securement at each discrete attachment point.
Solution Approach 2:
The attachment structure is designed to be dynamically compressible, allowing it to reduce its profile size during delivery through tortuous vessels and then expand or maintain its securement function upon deployment, achieving both small profile and reliable securement.
3Strength
If traditional stent graft systems with full rings are used, then secure attachment is achieved, but compression to small diameter for delivery is difficult
Solution Approach 1:
By segmenting the attachment ring into discrete points or segments, the structure becomes easier to compress to a small diameter for delivery while maintaining attachment strength at the discrete securement points, resolving the contradiction between attachment strength and compression ease.
Solution Approach 2:
The attachment structure utilizes flexible materials or thin film constructions that can be easily compressed and deformed during delivery, then maintain their attachment function upon deployment, improving compression ease while preserving attachment strength.
Data Source
AI summary
A tubular prosthetic device for implantation into a body lumen includes a first part including a tubular lumen and a second part including an attachment member. The second part is secured to the first part via various configurations, where the device is capable of being reduced to a diameter less than the diameter of traditional devices, for ease of use during implantation.Methods of using the device are also provided.