Stent With Segmented Connection Groups For Stability And Flexibility
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Solution Overview
Problem
Existing stents face challenges in achieving both configurational stability against compressive, tensile, and torsional forces while maintaining flexibility in the twisting direction, leading to irregular deformations such as bending or crushing when exposed to external forces.
Innovation Solution
A stent design featuring multiple tubular divided bodies connected by connection groups with multiple connection sections arranged at equal intervals in the circumferential direction, allowing for stability against axial and circumferential forces while ensuring flexibility in the twisting direction through strategically placed connection groups that are positioned away from each other across at least one turning portion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If many connection sections are arranged at equal intervals on both sides of each linear section, then configurational stability against compressive, tensile and torsional forces is achieved, but flexibility in the twisting direction becomes insufficient
Solution Approach 1:
The connection sections are segmented into multiple connection groups arranged at different positions. Specifically, first connection groups are arranged at first positions and second connection groups are arranged at second positions that are different from the first positions in the circumferential direction. This segmentation allows different regions to have different connection densities, providing both stability and twisting flexibility.
Solution Approach 2:
Different regions of the stent are given different connection characteristics. The first connection groups provide stability in specific regions while the second connection groups, positioned differently in the circumferential direction, provide flexibility in other regions. This local differentiation resolves the contradiction between overall stability and localized twisting flexibility.
2Adaptability or versatility
If the number of connection sections is decreased to enhance flexibility in the twisting direction, then configurational stability becomes insufficient due to reduced stiffness in the axial direction
Solution Approach 1:
Rather than uniformly decreasing connection sections, the invention segments them into first and second connection groups positioned at different circumferential locations. This allows selective reduction of connections in specific regions while maintaining connections in other regions, preserving both flexibility and stability.
Solution Approach 2:
The stent structure implements local quality by having different connection densities at different positions. First connection groups maintain stiffness where stability is needed, while second connection groups are positioned to allow flexibility where twisting adaptation is needed, preventing overall instability.
Data Source
AI summary
Provided is a stent having a novel structure, the stem simultaneously having both the stability of shape against the action of external force, such as compression force, tensile force, or torsional force, and high flexibility in the direction of twisting of the stem. Connection groups are provided at three or more positions set at circumferentially equally-spaced intervals, the connection groups each including connection sections which are disposed circumferentially close to each other between axially adjacent tubular divided bodies. The connection groups on both sides axially of each of the tubular divided bodies are provided at positions circumferentially offset from each other while at least one turning portion is present between the connection groups.