Bioresorbable V-Shaped Stent Structure for Higher Radial Force
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Solution Overview
Problem
Existing stents made of relatively soft materials face challenges in achieving high radial erection force, particularly when used in pathologically altered hollow organs, and often require surgical removal or cause biocompatibility issues due to non-bioresorbable materials.
Innovation Solution
A stent design featuring V-shaped support sections with web angles of 90° to 150°, made from a bioresorbable zinc alloy, which includes zinc, silver, and optionally titanium, allowing for high radial eruption force and flexibility, and optionally omitting longitudinal connectors in vessel branching areas to facilitate expansion and reduce material mass.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If conventional coronary stents with web angles of 60° to 80° are used, then the stent structure is simpler and easier to manufacture, but the radial erection force is insufficient especially when made of relatively soft materials
Solution Approach 1:
The patent applies parameter changes by modifying the web angle parameter from the conventional 60°-80° range to 90°-150°. This parameter change in the geometric configuration of the V-shaped support section directly increases the radial erection force generated by the stent, especially when made of relatively soft materials, while maintaining structural feasibility
2Reliability
If non-bioresorbable materials are used to provide structural support, then the stent maintains strength indefinitely, but biocompatibility issues arise and surgical removal is required
Solution Approach 1:
The patent applies parameter changes by transitioning from non-bioresorbable materials to bioresorbable materials with controlled degradation parameters. The material is designed to maintain structural integrity and provide radial support during the critical healing period, then gradually degrade and be absorbed by the body, eliminating the need for surgical removal and avoiding long-term biocompatibility issues
Solution Approach 2:
The patent employs a bioresorbable stent that serves its function temporarily during the healing process and then degrades naturally in the body. This disposable approach eliminates the need for permanent implantation and subsequent surgical removal, reducing long-term health risks associated with foreign body presence
3Strength
If longitudinal connectors are included in vessel branching areas, then the stent structure is more complete and structurally sound, but expansion is hindered and material mass is increased
Solution Approach 1:
The patent applies local quality by differentiating the stent structure in vessel branching areas from the rest of the stent. Longitudinal connectors are omitted specifically in vessel branching areas to facilitate expansion and reduce material mass, while maintaining structural integrity in other critical regions. This localized modification optimizes performance for specific anatomical conditions
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 high radial erection force and flexibility, minimizes biocompatibility issues by being bioresorbable, and simplifies expansion in vessel branches, reducing the risk of thrombosis and eliminating the need for surgical removal.
Implementation Method 1
The V-shape of the support section can be formed by two legs. The legs can be part of the rim elements. The web angle refers specifically to the angle formed or defined by the two legs of the V-shaped support section.
Implementation Method 2
the stent does not remain in the body indefinitely or require surgical removal. Instead, the material dissolves in the body after a few months and is absorbed and completely excreted via natural metabolic processes.
Data Source
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AI summary
The invention relates to a stent for transluminal implantation into hollow organs, in particular into blood vessels, ureters, oesophagi, colon, duodenum or bile ducts, comprising a substantially tubular body which extends in an axial direction and can be changed from a compressed state wtih a first cross-sectional diameter to an expanded state with an enlarged second cross-sectional diameter. The stent comprises a plurality of cells which are defined by web-like edge elements formed by the tubular body, the edge elements comprising at least one support strut running annularly about the axial direction. The stent is characterised in that the support strut has at least one V-shaped support portion which comprises a web angle from 90° to 150° when the stent has the second cross-sectional diameter.