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Finite element shape optimization for biodegradable magnesium alloy stents.

W Wu¹, L Petrini, D Gastaldi

¹Department of Structural Engineering, Politecnico di Milano, Milan, Italy.

Annals of Biomedical Engineering

|May 7, 2010

Summary

Optimized biodegradable magnesium alloy stents (MAS) show improved safety and scaffolding, potentially extending degradation time. This design advancement addresses lumen loss in current permanent stent platforms.

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Area of Science:

Biomaterials Engineering
Medical Device Design
Computational Mechanics

Background:

Permanent stent platforms in drug-eluting stents cause long-term adverse events.
Existing biodegradable magnesium alloy stents (MAS) exhibit significant lumen loss due to short degradation times.

Purpose of the Study:

To propose a novel design concept for MAS using shape optimization.
To enhance the performance and longevity of biodegradable stents.

Main Methods:

Finite element analysis (FEA) and a morphing procedure were used for shape optimization of 2D stent models.
Four magnesium alloys (AZ80, AZ31, ZM21, WE43) were evaluated.
3D FEA was employed to compare optimized designs with existing MAS.

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Main Results:

The optimized WE43 alloy stent demonstrated a 48% increase in strut width.
Improved safety properties were observed, with a 29% decrease in maximum principal stress and a 14% decrease in maximum principal strain.
Scaffolding ability increased by 24% compared to existing MAS.

Conclusions:

The optimized MAS design, particularly with WE43 alloy, offers enhanced safety, scaffolding, and potentially longer degradation times.
The applied shape optimization methodology is a practical approach for developing advanced biodegradable stent designs.