Synthetic Resin Mesh Stent for Peristaltic Tracking and Adhesion
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Solution Overview
Problem
Existing synthetic resin stents face challenges in achieving self-expandability, restorability, adherence to the gastrointestinal tract, and trackability to peristaltic movement, particularly due to difficulties in balancing the functions of the stent ends and central portion.
Innovation Solution
A synthetic resin stent design comprising a first stent body with a tubular mesh structure and a second stent covering its outer periphery, both deformable between reduced and expanded diameters, where the first stent body is formed by connecting polygonal annular portions and includes end flare portions, and the second stent has a denser mesh to enhance structural integrity and adherence.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a synthetic resin stent is manufactured in the same shape as a metal stent, then it can be produced with standard designs, but it fails to achieve required performance in self-expandability, restorability, adherence, and trackability
Solution Approach 1:
The stent is divided into multiple struts connected by joints, forming a expandable cage structure. This segmentation allows the stent to transition from a compressed delivery state to an expanded functional state, achieving self-expandability while maintaining manufacturability through modular construction
Solution Approach 2:
The stent incorporates movable joints that allow the structure to dynamically change shape between compressed and expanded states. This dynamic capability enables the stent to self-expand upon deployment while maintaining structural integrity, resolving the contradiction between standard manufacturing and performance requirements
2Strength
If the stent is designed with high self-expandability, then it can effectively dilate stenotic sites, but it becomes difficult to maintain trackability to peristaltic movement of the gastrointestinal tract
Solution Approach 1:
The stent is segmented into multiple struts and joints that can independently move, allowing the structure to expand radially for strength while maintaining longitudinal flexibility for trackability. The segmented design enables differential movement in different directions
Solution Approach 2:
Different portions of the stent have different structural properties - the struts provide radial strength for self-expandability, while the joints and connecting elements provide longitudinal flexibility for trackability. This local differentiation of mechanical properties resolves the contradiction between strength and adaptability
3Reliability
If the stent is designed with dense mesh structure, then it achieves better adherence to the gastrointestinal tract, but it becomes difficult to reduce the diameter for delivery
Solution Approach 1:
The stent employs a dynamic structure with movable joints that allows the mesh density to change during deployment. In the delivery state, the stent is compressed with reduced effective mesh density to fit the delivery catheter. Upon deployment, the joints unlock and the full mesh density is achieved for optimal adherence
Solution Approach 2:
The stent is designed to nest within itself during delivery, with the mesh structure collapsing into a compact configuration that fits within the delivery catheter. The nested configuration reduces the effective diameter while preserving the full mesh structure for adherence when expanded
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 achieves self-expandability, restorability, and trackability to peristaltic movement, ensuring stability and adherence to the gastrointestinal tract while maintaining structural strength and ease of delivery.
Implementation Method 1
a first stent including a first stent body formed of synthetic resin fiber into a tubular structure having a mesh, the first stent being deformable from a reduced diameter state to an expanded diameter state
Data Source
AI summary
A synthetic resin stent is able to demonstrate self-extensibility, restorability, adhesion to the digestive tract, and ability to follow peristaltic movement. The synthetic resin stent is provided with: a first stent that has a first stent body formed as a cylindrical mesh from fibers made of synthetic resin, and that can be deformed from a reduced-diameter state to an expanded-diameter state; and a second stent that is formed as a cylindrical mesh which is finer than that of the first stent body, is arranged so as to cover the outer periphery of the first stent body, and can be deformed from a reduced-diameter state to an expanded-diameter state.