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Electro and Magneto-Electropolished Surface Micro-Patterning on Binary and Ternary Nitinol.

Dharam Persaud-Sharma¹, Norman Munroe, Anthony McGoron

¹Florida International University, Department of Biomedical Engineering, 10555 W. Flagler Street, Miami, FL 33199, USA.

Trends in Biomaterials & Artificial Organs

|July 4, 2012

Summary

This summary is machine-generated.

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Surface treatments on Nitinol alloys, including Electropolished (EP) and Magneto-Electropolished (MEP), impact roughness and morphology. These micro-patterns may enhance cellular adhesion for improved endovascular stent performance.

Area of Science:

Biomaterials Science
Surface Engineering
Medical Device Technology

Background:

Nitinol (Nickel-Titanium) alloys are crucial for endovascular stents due to their superelasticity.
Surface properties significantly influence stent performance, affecting cellular interactions and biocompatibility.
Optimizing surface treatments is key to reducing complications like in-stent restenosis.

Purpose of the Study:

To analyze the surface roughness of non-commercial Nitinol alloys with Electropolished (EP) and Magneto-Electropolished (MEP) treatments.
To compare the surface characteristics of treated Nitinol alloys with commercially available stents.
To investigate the potential of surface micro-patterning for enhancing stent endothelialization and reducing restenosis.

Main Methods:

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Atomic Force Microscopy (AFM) was used to measure Root-Mean-Square (RMS), Average Roughness (Ra), and Surface Area (SA).

Surface analysis was conducted across various dimensional scales, from nanometers to micrometers.

Scanning Electron Microscopy (SEM) and Energy Dispersive Spectroscopy (EDS) were employed to examine surface morphology and elemental composition.

Main Results:

Nitinol with Tantalum (NiTi-Ta 10 wt%) and EP treatment showed the highest roughness.
Nitinol with Copper (NiTi-Cu 10 wt%) exhibited the lowest roughness at a 115 × 115 micrometer scale.
SEM/EDS revealed unique morphologies and aggregation of ternary elements (Cr, Cu) at grain boundaries in treated and untreated alloys.

Conclusions:

Surface treatments like EP and MEP create distinct micro-patterns on Nitinol alloys.
These surface modifications have the potential to improve cellular adhesion and endothelialization.
Optimized surface micro-patterning may lead to improved hemodynamic flow, reduced corrosion, and lower rates of in-stent restenosis.