Methods for securing strand ends and the resulting devices
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Solution Overview
Problem
Existing self-expanding stents with strands face challenges in securely fastening the ends of wires, particularly in maintaining alignment and stability during expansion and contraction, which affects their efficacy in anatomical structures.
Innovation Solution
The use of coupling structures made from nickel-titanium, which are laser-welded to the strand ends, providing a secure and stable connection that maintains alignment and allows for self-expansion, with the number and positioning of these structures corresponding to the number of strands, ensuring consistent strand bends and secure welds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If coupling structures are laser-welded to strand ends to secure alignment, then stability and alignment are improved, but device complexity increases
Solution Approach 1:
The device is divided into distinct functional components: the self-expanding stent body and separate coupling structures for securing strand ends. This segmentation allows each component to be optimized independently - the stent for its self-expanding properties and the coupling structures for secure welding and alignment maintenance.
Solution Approach 2:
Coupling structures serve as intermediary elements between the strand ends and the stent body. These coupling structures facilitate the connection by providing a secure welding surface and maintaining proper alignment, acting as a mediator that resolves the complexity of directly welding strands to the stent.
2Reliability
If multiple coupling structures are used corresponding to the number of strands, then reliability of connection is improved, but manufacturing complexity increases
Solution Approach 1:
The coupling structures are designed as universal components that can be applied to multiple strands with consistent geometry and material properties. This universality allows for standardized manufacturing processes and simplifies production, as the same coupling structure design can be replicated across all strands rather than requiring custom solutions for each.
Solution Approach 2:
The patent specifies precise parameter ranges for the coupling structures, including length as a percentage of device length and material composition (nickel-titanium). By defining these parameters within specific ranges, the patent enables consistent manufacturing while ensuring reliable performance across different device sizes and configurations.
3Strength
If laser welding is used to secure coupling structures, then strength of connection is improved, but manufacturing precision requirements increase
Solution Approach 1:
The coupling structures are pre-positioned on the strand ends before welding, with preliminary alignment features that guide the welding process. This preliminary action ensures proper positioning is achieved before the welding operation begins, reducing the precision demands on the welding process itself while still achieving strong, reliable connections.
Solution Approach 2:
The patent replaces traditional mechanical fastening methods with laser welding to secure the coupling structures. This substitution provides stronger, more permanent connections while the coupling structure design incorporates features that facilitate precise laser welding, such as appropriate material composition (nickel-titanium) and geometric configurations.
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
This solution enhances the stability and self-expansion capabilities of the stents, ensuring consistent performance and secure fixation within anatomical structures by effectively managing strand alignment and interaction.
Implementation Method 1
coupling structures made from nickel-titanium, which are laser-welded to the strand ends
Data Source
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AI summary
Methods for securing strand ends of devices configured for insertion into an anatomical structure, and the resulting devices.