Synthetic Resin Stent Radial Strength via Segmentation
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Solution Overview
Problem
Biodegradable synthetic resin stents face challenges in providing sufficient resistance to radial pressure while maintaining a thin fiber diameter, making it difficult to store them in delivery systems for placement in stenosis portions without compromising strength.
Innovation Solution
A synthetic resin stent design featuring a cylinder formed by thin fibers with a diameter enlarging mechanism and a restricting mechanism, utilizing string-like members that expand and lock the stent in an enlarged diameter state, ensuring resistance to radial pressure without requiring thick fibers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the fibers are made thick to provide sufficient resistance to radial pressure, then the strength is improved, but the stent becomes difficult to store in a thin tube-shaped delivery system
Solution Approach 1:
The stent is divided into multiple struts connected by connection portions, allowing the structure to achieve high radial strength through geometric configuration rather than fiber thickness. The segmented design enables compact storage while maintaining structural integrity when deployed
Solution Approach 2:
The stent utilizes three-dimensional spatial configuration with struts arranged in specific patterns (e.g., quadrilateral cross-sections, diamond patterns) to achieve radial strength without requiring thick fibers. The dimensional arrangement of thin fibers creates structural strength equivalent to or greater than thick fibers would provide
2Ease of operation
If the stent is kept in a reduced diameter state for storage and delivery, then the ease of storage is improved, but the resistance to radial pressure is insufficient when placed in the stenosis portion
Solution Approach 1:
The stent is designed to dynamically transition between a compressed low-profile state for delivery and an expanded high-strength state for support. The connection portions allow the struts to flex and reconfigure, enabling the stent to achieve sufficient radial strength only when deployed in the expanded configuration
Solution Approach 2:
The stent is pre-configured with specific geometric patterns and connection structures that will automatically provide radial strength once expanded. The design incorporates pre-stressed geometries and reinforcement patterns that activate upon deployment, ensuring sufficient strength is available when needed in the expanded state
Data Source
Figure 1A~1B
Figure 2
Figure 3A~3B
AI summary
Provided is a synthetic resin stent that has resistance to pressure externally applied from the radial direction while in an enlarged diameter state even when the synthetic resin fibers are thin. The synthetic resin stent 1 comprises: a stent main section 2 that is formed by synthetic resin fibers 20 into a cylinder and that can deform from a reduced diameter state to an enlarged diameter state; and a restricting mechanism 4 that keeps the stent main section 2 in the enlarged diameter state by restricting the stent main section 2 from reducing in diameter when in the enlarged diameter state. The synthetic resin stent 1 preferably further comprises a diameter enlarging mechanism 3 that is connected to the stent main section 2 and that deforms the stent main section 2 from a reduced diameter state to an enlarged diameter state.