Vascular Stent Segmented Design for Aortic Arch Stability
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Solution Overview
Problem
Current stent systems face higher risks during aortic surgeries due to the complexity of the aortic arch's anatomical structure and hemodynamics, with traditional stents causing secondary splits and instability, which complicates the treatment of aortic diseases.
Innovation Solution
A vascular stent with a tubular structure composed of ring-shaped units, featuring a covered segment with a membrane, an exposed segment woven by metal wire with keel-wires for enhanced torsion and mesh holes, designed to fit the aortic arch without obstructing branch arteries, ensuring secure fixation and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional stent systems are used in aortic arch surgery, then the stent can be implanted to treat aortic diseases, but the risk of vascular damage increases due to the complexity of the aortic arch anatomy and hemodynamics
Solution Approach 1:
The stent is divided into three functional segments: a covered segment for sealing aortic lesions, an exposed segment for conforming to the aortic arch, and a transition segment connecting them. This segmentation allows each part to perform its specific function optimally, reducing overall risk
Solution Approach 2:
Different segments of the stent have different structural properties: the covered segment provides sealing, the exposed segment provides conformability with mesh holes for blood flow, and the transition segment provides gradual adaptation. This local differentiation addresses the complex anatomical requirements of different aortic regions
2Ease of operation
If traditional stents are implanted into highly-bent aortic vessels, then the stent can be deployed, but secondary distal or proximal splits are caused
Solution Approach 1:
The exposed segment is designed with a braided wire mesh structure that allows dynamic adaptation to the aortic arch's curvature and movement, enabling the stent to conform to bent vessels without causing secondary splits
Solution Approach 2:
The stent incorporates a keel-wire that creates a pre-curved shape matching the aortic arch's natural curvature, allowing the stent to align with the bent vessel anatomy and reduce mechanical stress that could cause splitting
3Productivity
If the exposed segment is made with a braiding process to form mesh holes, then blood flow communication is facilitated, but the structural integrity may be compromised
Solution Approach 1:
The exposed segment combines braided metal wires forming a mesh structure that provides both porosity for blood flow and sufficient mechanical strength, achieving a balance between flow communication and structural integrity
Solution Approach 2:
The transition segment acts as an intermediary between the covered segment and the exposed mesh segment, gradually changing the structural properties to maintain overall stent integrity while enabling blood flow through the mesh portion
Data Source
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AI summary
The present application disclosed a vascular stent (100), which includes: a stent body (110) including a plurality of ring-shaped units (112) arranged at intervals and a connecting portion connecting all the ring-shaped units (112) into a tubular structure, wherein the tubular structure comprises a first covered segment (120) and a second covered segment (130) that are provided with membrane, and an exposed segment (140) configured for engaging the first covered segment (120) and the second covered segment(130). The vascular stent (100) is reliable in installation, which is beneficial to reduce pre-operation and post-operation adjustment work. The stent system can realize the reliable installation of the vascular stent (100), which is beneficial to improve the quality of the operation and reduce the operation time.