Bioresorbable Outer Body Stent for Radial Force and Flexibility
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Solution Overview
Problem
Stents face a compromise between radial deployment force and flexibility, and they often require precise placement and easy insertion into hollow organs like blood vessels, which is challenging due to their design.
Innovation Solution
A stent design featuring a bioresorbable outer body and a durable inner body, where the outer body simplifies insertion and positioning, and after degradation, the inner body remains to provide flexibility and support, with features like X-ray markers and separate annular sections for enhanced placement and adaptability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the stent is designed with high radial deployment force to provide sufficient supporting effect, then the supporting effect is improved, but the flexibility along the longitudinal direction deteriorates
Solution Approach 1:
The stent is divided into multiple individual cells or struts that are connected by hinges or joints. This segmentation allows each element to contribute to radial support while the connections between elements enable longitudinal flexibility, resolving the contradiction between radial strength and longitudinal adaptability.
2Measurement precision
If the stent is designed for precise placement within the hollow organ, then the positioning accuracy is improved, but the ease of insertion deteriorates
Solution Approach 1:
The stent incorporates radiopaque markers or contrast elements that make the stent visible under fluoroscopic guidance during insertion. This allows precise positioning to be achieved without complicating the insertion process, as the markers provide real-time feedback on stent location while the stent maintains its deliverability through the catheter.
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 a balance between radial deployment force and flexibility, allowing precise placement and long-term support within the hollow organ, with the bioresorbable outer body facilitating easier insertion and resorption, leaving a flexible and supportive inner body structure.
Implementation Method 1
the outer body composed of the bioresorbable material is degraded, i.e. 'resorbed,' over a certain period of time
Implementation Method 2
The inner body can in particular be formed from a shape-storing material ('shape memory') that assumes the stored shape from a limit temperature onward
Data Source
AI summary
The invention relates to a stent for transluminal implantation into hollow organs, in particular into blood vessels, ureters, esophagi, the colon, the duodenum, the airways or the biliary tract, comprising an at least substantially tubular body that extends along a longitudinal direction and that can be converted from a compressed state having a first cross-sectional diameter into an expanded state having an enlarged second cross-sectional diameter. The stent in accordance with the invention is characterized in that the tubular body comprises an inner body and an outer body, with the outer body surrounding the inner body at least regionally, with the outer body completely running around at least one section of the inner body, and the outer body is formed from a bioresorbable material or comprises a bioresorbable material.