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Lithium-Induced Optimization Mechanism for an Ultrathin-Strut Biodegradable Zn-Based Vascular Scaffold.

Hongtao Yang1,2, Dawei Jin3, Jiancun Rao4

  • 1Beijing Advanced Innovation Center for Materials Genome Engineering & School of Materials Science and Engineering, Peking University, Beijing, 100871, P. R. China.

Advanced Materials (Deerfield Beach, Fla.)
|March 15, 2023
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Summary

Researchers developed ultrathin-strut biodegradable zinc scaffolds by adding lithium. These novel scaffolds demonstrate enhanced strength and modified biodegradation, potentially overcoming limitations in next-generation stent technology.

Keywords:
Zn-Li alloysbiodegradation mechanismsbiological effectsmechanical performanceultrathin-strut scaffolds

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Area of Science:

  • Biomaterials Science
  • Materials Engineering
  • Cardiovascular Research

Background:

  • Thin-strut stents reduce in-stent restenosis and thrombosis.
  • Current biodegradable stents have thick struts, limiting advancements.
  • Ultrathin-strut designs (≤70 µm) are crucial for durable stents.

Purpose of the Study:

  • To engineer an ultrathin-strut (65 µm) biodegradable zinc (Zn) scaffold using microalloying with lithium (Li).
  • To modify biodegradation behavior and enhance biofunction of Zn scaffolds.
  • To address the limitations of current biodegradable stent platforms.

Main Methods:

  • Fabrication of an ultrafine-grained Zn-Li scaffold with nanoscale Li-containing phases.
  • Characterization of scaffold radial strength and strut thickness compared to pure Zn.
  • Analysis of biodegradation products and microenvironment changes (pH, buffering).
  • Evaluation of endothelial and smooth muscle cell responses in porcine coronary arteries.

Main Results:

  • The Zn-Li scaffold achieved twice the radial strength with 40% thinner struts (65 µm) than pure Zn.
  • Lithium addition altered biodegradation, creating a stabilized alkaline microenvironment via Li₂CO₃.
  • Co-release of Zn²⁺ and Li⁺ ions promoted endothelialization and limited intimal hyperplasia.

Conclusions:

  • Microalloying Zn with Li enables ultrathin-strut biodegradable scaffolds with superior mechanical properties and biofunction.
  • Modified biodegradation and ion co-release offer a promising strategy for next-generation cardiovascular stents.
  • This approach may overcome the limitations hindering the development of advanced biodegradable scaffolds.