Semi-suture Plastic Stent for Aortic Dissection
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Solution Overview
Problem
Current metal wire-covered stents for aortic dissection lack flexibility and radial support, leading to potential new dissection tears at the proximal end, particularly causing retrograde type A dissection, which is a significant complication in aortic dissection treatment.
Innovation Solution
A plastic covered stent with a tubular membrane and multiple annular stents sutured along the axial direction, featuring semi-suture zones that allow for bending flexibility and radial support, enabling the stent to maintain its shape and reduce pressure within the false lumen, promoting thrombosis and treating aortic dissection effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a metal wire-covered stent is used for aortic dissection, then radial support strength is improved, but flexibility is worsened, leading to potential new dissection tears at the proximal end
Solution Approach 1:
The stent is divided into multiple independent units (first stent unit, second stent unit, third stent unit) connected by flexible connections. Each unit can independently expand to provide radial support while the connections between units allow the stent to bend and adapt to the aortic curvature, resolving the contradiction between radial support strength and flexibility
Solution Approach 2:
The stent incorporates flexible membrane structures and thin film connections between stent units. These flexible elements allow the stent to bend and conform to the aortic geometry while the metal wire framework within each unit maintains radial support strength, preventing new dissection tears
2Reliability
If a covered stent is used to isolate blood and aortic dissection, then treatment effectiveness is improved, but the risk of new dissection tears at the proximal end increases due to poor plasticity
Solution Approach 1:
The stent is designed with dynamic flexibility, allowing it to adapt to the natural movement and curvature of the aorta. The flexible connections between stent units enable the stent to dynamically conform to aortic geometry changes, reducing stress concentrations that could cause new dissection tears while maintaining the isolation function
Solution Approach 2:
The stent structure incorporates varying degrees of flexibility across different segments. The first, second, and third stent units have different configurations to match the varying curvature requirements of the aorta, with flexible connections allowing parameter adjustment to prevent harmful stress concentrations
Data Source
Figure 1~2a
Figure 2b~4
Figure 5~6
AI summary
A plastic covered stent (100) for aortic dissection and an aortic dissection stent are disclosed. The plastic covered stent (100) for aortic dissection includes a tubular membrane (150) and multiple annular stents (110, 120, 130, 140) sequentially sutured on the membrane (150) along an axial direction. Part of the annular stents on the membrane (150) are semi-suture stents (130). Each semi-suture stent (130) has non-suture zones separable from the membrane (150). When the plastic covered stent is bent, the membrane (150) corresponding to the non-suture zones at an inner bending side of the plastic covered stent is separated from the semi-suture stents (130) and folded inwardly. The semi-suture stents (130) are distributed on a bending portion of the plastic covered stent (100) for aortic dissection after being implanted. The semi-suture stents (130) form at least two adjacent circles. For the plastic covered stent (100) for aortic dissection, when the covered stent (100) is bent, the non-suture zones of two adjacent annular stents (110, 120, 130, 140) located at the inner bending side can be stacked, and the membrane (150) at the non-suture zones is folded towards inside of the covered stent, thus maintaining the bending form of the covered stent (100).