Stent Graft Diameter Reduction Arrangement for Aortic Alignment
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Solution Overview
Problem
Current stent graft systems face challenges in conforming to the curvature of the aorta, leading to potential malposition and procedural failures, particularly in the thoracic aorta or aortic arch, due to the 'bird beak' configuration and difficulty in aligning and re-aligning the stent graft.
Innovation Solution
A diameter reduction arrangement using a strand section with immovably secured ends that forms double-stranded tails and loops to constrict the stent graft, allowing for controlled expansion and alignment, and a release mechanism like trigger wires to maintain the constricted configuration, preventing malposition and facilitating alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a stent graft is inserted into the aorta to treat aneurysms or ulcers, then the aortic wall can be reinforced and sealed, but the stent graft cannot conform to the curvature of the aorta, leading to malposition and procedural failures
Solution Approach 1:
The stent graft incorporates a diameter reduction arrangement with a strand section that can dynamically change the diameter of the proximal end. The strand section can be pulled to constrict the diameter or released to allow expansion, enabling the stent graft to adapt its shape during deployment to conform to the aortic curvature while maintaining structural support.
Solution Approach 2:
The invention changes the diameter parameter of the stent graft proximal end by using a可调 diameter reduction arrangement. By adjusting the constriction level of the strand section, the proximal end diameter can be modified to match the curvature requirements of the aorta, transforming a rigid structure into one with adjustable geometric parameters.
2Manufacturing precision
If the stent graft proximal end is constricted to conform to aortic curvature, then alignment is improved, but the device complexity increases due to the diameter reduction arrangement
Solution Approach 1:
The diameter reduction arrangement is segmented into distinct components: a strand section with first and second ends, attachment points on the stent graft, and a release mechanism. This segmentation allows each component to perform its specific function while keeping the overall design manageable and the components relatively simple in structure.
3Ease of operation
If a diameter reduction arrangement with movable strand section is used, then the stent graft can be aligned and re-aligned, but the structural stability may be compromised
Solution Approach 1:
The strand section is pre-attached to the stent graft at specific locations (first and second ends) before deployment. This preliminary attachment ensures that the structural integrity is maintained from the beginning, and the constriction action is performed in a controlled manner that does not compromise the overall stability of the stent graft structure.
Data Source
AI summary
A medical device system includes a tubular medical device and a diameter reducing arrangement. The tubular medical device comprises a tubular graft body having a proximal end and a distal end. The diameter reducing arrangement is configured for constricting the medical device, and includes a strand section having first and second ends and being immovably secured to the medical device at the first end and at the second end. The second end is a first circumferential distance from the first end by way of a path along the strand section In a constricted configuration of the medical device a first portion of the strand section extends back on itself to form a first double-stranded tail leading to a first loop, the first tail extending circumferentially against the graft body, constricting the medical device by the strand section restricting the first circumferential distance between the first and second ends of the strand section.