Stent Surface Topography for Orientation-Independent Cell Migration

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Solution Overview

Problem

Existing intravascular stents face challenges in promoting rapid endothelial cell migration onto their surface due to smooth surfaces that are not optimally oriented with blood flow, leading to potential thrombosis and restenosis, and continuous topographical features that lose orientation with varying vessel conditions.

Innovation Solution

Implementing a noncontiguous pattern of topographical features on the stent surface that allows endothelial cell migration in multiple directions, regardless of the stent's final positioning, using methods like photolithography or chemical etching to create patterns such as grooves, dots, or other shapes that enhance cell migration and adherence.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If a smooth surface is used on the stent, then manufacturing is easier and the surface is easier to produce, but endothelial cell migration is slowed down leading to increased thrombosis risk

Engineering Contradiction:

Improvesurface productionVSAvoidthrombosis prevention

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

The stent surface is modified with local topographical features (grooves, ridges, or patterns) that create specific microenvironments to guide endothelial cell migration. These localized structural variations provide directional cues for cell movement while maintaining overall surface smoothness for manufacturability, resolving the contradiction between ease of production and thrombosis prevention.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

Asymmetric topographical patterns are introduced to the stent surface to create directional guidance for endothelial cells. The asymmetric features (such as unidirectional grooves or angled ridges) promote cell migration in the desired direction along the vessel wall, improving thrombosis prevention without significantly complicating the manufacturing process.

Inventive Principle:

Principle #4Asymmetry

2Reliability

If continuous topographical features are used on the stent, then cell migration guidance is improved, but the features lose proper orientation when vessel conditions vary

Engineering Contradiction:

Improvecell migration guidanceVSAvoidorientation with varying vessel conditions

Core Design Contradiction:

ReliabilityVSAdaptability or versatility

Solution Approach 1:

The continuous topographical features are segmented into discrete, distributed elements arranged in a pattern across the stent surface. This segmentation allows each feature to independently guide cell migration locally, while the overall pattern maintains effectiveness across varying vessel conditions and stent orientations, resolving the contradiction between migration guidance and adaptability.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The topographical pattern design incorporates multi-directional or radially symmetric elements that can guide endothelial cell migration effectively regardless of the stent's final orientation in the vessel. This universal design approach ensures consistent cell migration guidance functionality under varying physiological conditions, addressing both reliability and adaptability requirements.

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Reliability

If topographical features are added to the stent surface, then endothelial cell migration is accelerated, but the device complexity increases

Engineering Contradiction:

Improveendothelial cell migration rateVSAvoidsurface structure

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

Complex mechanical machining processes are replaced with photochemical etching methods to create topographical features on the stent surface. This substitution allows for precise pattern formation with simpler manufacturing steps, accelerating endothelial cell migration while minimizing the increase in device complexity and manufacturing difficulty.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

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

Accelerates endothelial cell coverage and adherence, reducing thrombosis risk and enhancing stent patency by ensuring cell migration aligns with blood flow direction, even with varying implant conditions.

Implementation Method 1

using methods like photolithography or chemical etching to create patterns such as grooves, dots, or other shapes

Methodology Applied

Scientific EffectPhotolithography: Photopolymerisation

Implementation Method 2

using methods like photolithography or chemical etching to create patterns such as grooves, dots, or other shapes

Methodology Applied

Scientific EffectChemical etching: Ablation

Data Source

PatentUS12558210B2Method of making topographical features and patterns on a surface of a medical device

Publication Date: 2026.02.24 VACTRONIX SCIENTIFIC LLC

AI summary

Methods of forming topographical features on an article, for example on a medical devices that has a surface configured to promote the migration of cells onto the surface of the medical device. In particular, the resulting surface of the medical device has a noncontiguous pattern of topographical features formed therein or thereon.