Hybrid Pattern Stent Structure for Bending Without Collapse
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Solution Overview
Problem
Prior art intravascular stents are prone to collapse when bent around sharp angles due to their inflexibility, limiting their implantation in tightly bent vessels.
Innovation Solution
A hybrid pattern intravascular stent with geometrically deformable closed cells and bridge members, fabricated using a thin ribbon of biocompatible materials like nickel-titanium alloys, which provides both scaffold strength and flexibility, allowing for improved bending without severe buckling. The stent is manufactured using vapor deposition techniques and patterning methods like laser cutting to create a crimpable and expandable structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If prior art stents are made with traditional designs, then they provide structural support, but they collapse when bent around sharp angles due to inflexibility
Solution Approach 1:
The stent is divided into multiple struts that form a lattice structure, allowing each strut to independently deform during bending while maintaining overall structural integrity. This segmentation enables the stent to flex around sharp angles without collapsing, resolving the contradiction between radial strength and flexibility.
Solution Approach 2:
The stent employs a dynamic lattice design where the struts can change configuration during bending. The interconnected struts allow for controlled deformation that adapts to sharp angles while maintaining radial support, transforming the stent from a rigid structure to a dynamically adaptable one.
2Strength
If stents are made from tubular materials, then they provide structural integrity, but the cost of base materials increases
Solution Approach 1:
The stent uses a porous lattice structure formed by intersecting struts instead of solid tubular material. This porous design maintains structural integrity through the geometric arrangement of struts while using significantly less material, thereby reducing base material costs while preserving structural strength.
Solution Approach 2:
The stent combines multiple struts into a composite lattice structure that achieves superior structural integrity compared to solid tubes of equivalent material用量. The composite arrangement of struts distributes mechanical loads efficiently, providing high strength-to-material-ratio that reduces overall material cost.
3Strength
If stents are made with thicker wall materials, then they provide adequate strength, but consistency and verification of wall thicknesses becomes more difficult
Solution Approach 1:
The continuous wall structure is segmented into discrete struts of uniform cross-section. This segmentation allows for precise control and verification of wall thickness at each strut, improving manufacturing precision and consistency while maintaining adequate strength through the cumulative effect of multiple struts.
Solution Approach 2:
The design transitions from varying wall thicknesses in traditional stents to uniform strut dimensions in the lattice structure. This parameter standardization simplifies manufacturing processes and enables consistent verification of thickness across all struts, while the number and arrangement of struts are optimized to maintain required strength levels.
4Strength
If traditional stent manufacturing methods are used, then they provide adequate structural support, but access to inner diameter surfaces for imparting grooves or patterns is limited
Solution Approach 1:
The continuous wall is segmented into discrete struts with open spaces between them, providing unobstructed access to the inner diameter surface. This segmentation allows easy application of grooves, patterns, or drug coatings on the luminal surface of each strut without the constraints of a solid tubular structure, while the overall lattice maintains structural support.
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 hybrid pattern stent achieves enhanced radial strength for maintaining vessel patency while offering flexibility suitable for implantation in sharply bent vessels, reducing the need for post-deposition processing and minimizing material costs.
Implementation Method 1
The stent is manufactured using vapor deposition techniques
Implementation Method 2
patterning methods like laser cutting to create a crimpable and expandable structure
Data Source
AI summary
An intravascular stent and method of making an intervascular stent having a hybrid pattern a. The hybrid pattern comprises a plurality of circumferentially self-expansible members comprising a plurality of interconnected, geometrically deformable closed cells, adjacent self-expansible members interconnected by a plurality of bridge members linking a first interconnection between two closed cells in a first self-expansible member to a second interconnection between two closed cells in a second self-expansible member, wherein the second interconnection is circumferentially offset and non-adjacent to the first interconnection.