Partly Projected Double-Walled Stent With Inclined Ridges
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Solution Overview
Problem
Existing stents may not be securely maintained in a conduit within the human body due to external forces or pressures, leading to potential displacement from their original position.
Innovation Solution
A double-walled stent design featuring a body with crossed wires forming a mesh pattern and protrusions with inclined ridges on its outer surface, which provide resistance to external forces and a cover to prevent lesion penetration, ensuring secure placement and preventing re-stenosis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional single-walled stent is used, then the manufacturing process is simple, but the stent cannot be securely maintained in the conduit due to external forces or pressures
Solution Approach 1:
The stent is divided into two separate walls (inner wall and outer wall) that are coupled together. Each wall can be manufactured and positioned independently, then joined to form a dual-walled structure that provides enhanced securing capability through multiple attachment points and distributed mechanical interlocking along the longitudinal direction.
Solution Approach 2:
The inner wall is positioned inside the outer wall, creating a nested configuration where the two walls are coupled together. This nested structure allows the stent to maintain its shape and resist external forces while providing a secure fit within the conduit through the interaction between the inner and outer walls.
2Strength
If protrusions are added to the stent body, then resistance to external forces is improved, but the manufacturing complexity increases
Solution Approach 1:
The protrusions are integrated into the dual-walled structure by forming them as part of the coupling mechanism between the inner and outer walls. This merging of the protrusion function with the wall coupling structure allows the protrusions to provide mechanical strength and resistance to external forces while being manufactured as an integrated component, reducing overall manufacturing complexity.
3Reliability
If the stent is designed to be secure against displacement, then reliability is improved, but the device complexity increases due to additional structural elements
Solution Approach 1:
The inner and outer walls are designed with pre-formed coupling structures and protrusions that are prepared during manufacturing. When the stent is deployed, these pre-configured elements automatically engage with each other and the conduit wall, providing immediate position stability without requiring additional active components or complex deployment mechanisms.
Data Source
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AI summary
Disclosed is a partly projected double-walled stent. Provided is a technique for allowing a stent to be easily secured in a conduit in a human body by a protrusion coupled to a body. According to the stent, first and second ridges of the protrusion are crossed and projected to be inclined in opposite directions, and thus the partly projected double-walled stent is rigidly secured in the conduit in the human body without being displaced in the left and right directions by an external force. Also, the number of protrusions can be adjusted according to circumstances so as to simplify a manufacturing process and reduce manufacturing costs. Further, a cover coupled to the body prevents a lesion portion from penetrating into the partly projected double-walled stent, thus preventing re-stenosis caused by the lesion portion.