Stent Anti-Migration Design Using Suture-Connected Outer Rings
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Solution Overview
Problem
Conventional stents with anti-migration features face challenges in securely holding their position within the human body due to manufacturing limitations and inefficiencies, leading to potential damage during insertion and removal, as well as incomplete anti-migration effects.
Innovation Solution
A stent with a double structure, comprising a cylindrical stent formed by interweaving superelastic shape memory alloy wires and an outer stent with a predetermined angle and suture-connected design, allowing for displacement and transformation to securely hold onto the inner surface of the lumen, preventing migration and deviation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an expanded part is added to at least one end of the hollow stent body to prevent migration, then the anti-migration effect is improved, but the manufacturing complexity increases and the stent cannot be securely held due to manufacturing limitations
Solution Approach 1:
The stent is divided into multiple functional segments: a cylindrical hollow stent body for maintaining lumen patency, and separate anti-migration bent parts formed by extending wires at specific positions on the outer circumference. This segmentation allows each component to perform its specific function independently while simplifying manufacturing compared to creating complex expanded ends.
Solution Approach 2:
Instead of modifying the entire stent structure with expanded ends, the invention applies anti-migration features locally at specific positions on the outer circumference through bent parts. This localized approach achieves the anti-migration effect where needed without complicating the overall manufacturing process.
2Reliability
If an anti-migration bent part is formed by extending a wire to slantingly protrude upward at multiple positions on the outer circumference, then the stent is held on the inner surface of the lumen, but the production efficiency decreases and the stent volume increases
Solution Approach 1:
The anti-migration bent parts are integrated into the existing wire structure of the hollow stent body during the same manufacturing process. The wires that form the diamond-shaped spaces are extended and bent to create the anti-migration features, merging the structural function and anti-migration function into a single unified component without requiring separate production steps.
3Reliability
If an anti-migration bent part is formed by extending a wire to slantingly protrude upward, then the stent is held on the inner surface of the lumen, but the stent cannot be easily removed and may prick the inner surface of the lumen
Solution Approach 1:
The anti-migration bent parts are designed with asymmetric geometry that provides optimal engagement with the lumen inner surface during insertion and positioning. The bent parts slant in a direction that facilitates secure holding during the procedure while allowing controlled removal without pricking the lumen, as the asymmetric shape permits withdrawal along the insertion path without lateral displacement.
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
The stent effectively prevents migration and secure positioning within the lumen, ensuring stable placement and easy removal without causing damage to the inner surface, addressing the limitations of existing stent designs.
Implementation Method 1
a cylindrical stent formed by interweaving superelastic shape memory alloy wires diagonally such that the wires alternately cross over and under each other
Implementation Method 2
the stent manufactured by interweaving superelastic shape memory alloy wires is configured to have a double structure
Data Source
AI summary
A stent is effective for anti-migration after operation of a lumen, and a first outer stent or a second outer stent is used to be integral to a cylindrical stent and an upper end part of each of the first outer stent or the second outer stent is connected to the cylindrical stent by sutures to have a space part between the cylindrical start, the first outer stent, and the second outer stent. The space part is provided such that the first outer stent or the second outer stent is freely moved or transformed by an external force, and a displacement part caused by the movement or a transformation part caused by the transformation further presses or moves into a lesion part or an inner surface of the lumen to be securely held thereon, whereby the stent is effectively prevented from deviating from the lesion part.