Wave-Ring Absorbable Stent Structure for Thin-Wall Radial Support
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Solution Overview
Problem
Existing absorbable stents face challenges in achieving a balance between a short corrosion and absorption cycle and sufficient early radial supporting strength, with current materials and designs either being too slow to degrade or lacking mechanical properties.
Innovation Solution
An absorbable stent design featuring multiple turns of wave-shaped rings connected by connection units, with specific strut angles, lengths, and wall thicknesses, optimized to reduce matrix volume per unit vascular area while maintaining high radial supporting strength, achieved through precise pattern design and polishing techniques.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If the wall thickness of the stent is reduced to shorten the corrosion and absorption cycle, then the absorption time is improved, but the radial supporting strength deteriorates
Solution Approach 1:
The patent changes the geometric parameters of the stent structure, specifically optimizing the wave shape parameters (amplitude, wavelength, curvature radius) and strut configuration to achieve high radial supporting strength with reduced wall thickness. The matrix volume per unit vascular area is controlled within 4-40μm, which allows thin-wall construction while maintaining mechanical performance through optimized structural geometry.
Solution Approach 2:
The patent employs wave-shaped rings with optimized curvature radii (R1, R2, R3) to distribute stress more effectively. The curved wave structure provides better mechanical strength compared to straight or simple circular designs, enabling the stent to maintain radial supporting strength despite reduced wall thickness. The wave peaks and valleys create a more efficient load-bearing structure.
2Strength
If the stent wall thickness is increased to improve radial supporting strength, then the mechanical property is improved, but the profile diameter increases and delivery becomes difficult
Solution Approach 1:
The patent optimizes the geometric parameters of the wave structure to achieve high radial supporting strength with minimal wall thickness. By controlling the matrix volume per unit vascular area within 4-40μm and optimizing wave amplitude and wavelength, the stent maintains excellent mechanical properties while achieving a small profile diameter for easy delivery through catheters.
Solution Approach 2:
The patent successfully implements a thin-wall stent design with wall thickness optimized for both mechanical strength and deliverability. The thin-wall construction (controlled matrix volume) provides sufficient radial supporting strength while maintaining flexibility and small profile diameter, allowing the stent to be delivered through standard catheter systems and navigate complex vascular anatomy.
3Strength
If the stent wall thickness is increased to improve radial supporting strength, then the mechanical property is improved, but the bending property deteriorates and delivery becomes difficult
Solution Approach 1:
The patent optimizes the wave structure parameters including amplitude, wavelength, and curvature radius to achieve an optimal balance between radial supporting strength and bending flexibility. The controlled matrix volume (4-40μm) and wave geometry enable the stent to maintain high radial strength while preserving excellent bending properties for navigation through tortuous vessels and delivery through flexible catheter systems.
Data Source
AI summary
An absorbable stent includes an absorbable matrix. The matrix includes a number of wave-shaped rings connected by connection units and arranged in an axial direction. The wave-shaped ring includes a number of waves arranged in a circumferential direction. A peak, a valley and a support connecting the peak and the valley form the wave. Two adjacent wave-shaped rings and the connection unit form a closed side supporting unit. The matrix has a volume of 4 μm to 40 μm per unit blood vessel area. The absorbable stent has sufficient radial supporting strength of no less than 55 kPa for clinical applications. Moreover, the volume of the matrix per unit blood vessel area is less than volumes of existing stents. When the absorbable stent and existing stents are made of the same material, the absorbable stent has a shorter degradation and absorption cycle.