Woven Stent Locking Structure to Prevent Positional Deviation
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Solution Overview
Problem
Conventional self-expanding stents face issues with decreased strength and durability due to non-entwined wire configurations and movement of locking portions, leading to potential positional deviation and increased risk of bleeding or perforation.
Innovation Solution
A stent design featuring a tubular portion and locking portions with linear bodies that protrude outward upon expansion, where the linear bodies pass through entwined portions to provide anchor support, reducing stress concentration and preventing movement, while maintaining strength and durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If locking portions are provided by intentionally not entwining a wire in a part of the stent, then the anchor function is improved, but the strength and durability of the tubular portion decrease
Solution Approach 1:
The stent is divided into distinct functional zones: entwined portions for structural strength and non-entwined locking portions for anchor function. This segmentation allows each region to optimize its specific purpose while maintaining overall integrity.
Solution Approach 2:
Different regions of the stent have different wire configurations - some areas are entwined to provide strength, while other areas are intentionally left non-entwined to provide locking/anchor function. This local differentiation resolves the contradiction by assigning specific properties to specific locations.
2Reliability
If locking portions are provided by not entwining wire, then the anchor function is improved, but the movement of locking portions increases leading to decreased durability
Solution Approach 1:
The locking portion is merged with the tubular portion through continuous wire construction, where the locking portion is formed by bending the wire at specific locations. This integration ensures that the locking portion moves as a unified structure with the tubular portion, preventing independent movement and maintaining stability.
3Ease of operation
If the stent is expanded to achieve proper placement, then the lumen securing function is improved, but the stress concentration on body wall increases
Solution Approach 1:
The stent utilizes a flexible wire construction that can be compressed for delivery and then expands to the desired diameter. The flexible nature of the wire mesh allows gradual expansion and conforms to the body wall, distributing stress more evenly rather than creating concentrated stress points.
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 design effectively suppresses positional deviation, reduces stress concentration, and minimizes bleeding or perforation risks by utilizing a woven wire structure with protruding linear bodies that enhance anchor functionality and accommodate a resin cover for improved stability and ease of removal.
Implementation Method 1
The self-expanding stent is a stent that contracts in the radial direction due to elasticity when a compressive force is applied, and expands in the radial direction when the compressive force is released.
Implementation Method 2
The locking portion is configured to protrude to the outside of the tubular portion when the tubular portion is expanded
Data Source
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AI summary
A stent includes a tubular portion and a locking portion. The tubular portion is formed by weaving a wire, has a plurality of entwined portions at each of which the wire intersects with itself in a hook shape and is entwined with itself, and is configured to be expandable. The locking portion is configured to protrude to the outside of the tubular portion when the tubular portion is expanded. The locking portion has a first linear body that passes through a first hole formed in a first entwined portion that is one of the plurality of entwined portions.