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An Innovative Solvent-Responsive Coiling-Expanding Stent.

Shuo Shi1, Miao Cui2, Fengxin Sun3

  • 1Department of Biomedical Engineering, City University of Hong Kong, Hong Kong S.A.R, 999077, China.

Advanced Materials (Deerfield Beach, Fla.)
|July 5, 2021
PubMed
Summary

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This summary is machine-generated.

A novel two-way shape-memory cellulose vascular stent was developed. This biocompatible stent, made from bilayer shape-memory films (BSMFs), offers adjustable shape recovery using mild solutions for potential coronary artery disease treatment.

Area of Science:

  • Biomaterials Science
  • Materials Engineering
  • Cardiovascular Research

Background:

  • Coronary artery disease (CAD) is a leading global cause of mortality.
  • Current stent treatments, while effective, lack ideal properties like non-toxicity and optimal mechanical support.
  • There is a critical need for advanced vascular stents with improved characteristics.

Purpose of the Study:

  • To construct and evaluate a novel two-way shape-memory cellulose vascular stent.
  • To investigate the shape-memory characteristics, mechanical properties, and biocompatibility of the developed stent.
  • To assess the potential of this stent for treating coronary artery disease.

Main Methods:

  • Fabrication of bilayer two-way shape-memory films (BSMFs) from cellulose.
Keywords:
actuatorscelluloseshape memorysmart materialsstents

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  • Systematic investigation using ex vivo experiments, molecular simulation, and theoretical modeling.
  • Evaluation of shape-memory recovery triggered by mild solutions (water, alcohol).
  • Assessment of cell toxicity via live/dead cell viability assays.
  • Testing of mechanical properties and biocompatibility in ex vivo models.

    • Main Results:

    • The developed BSMFs exhibit two-way shape-memory properties, adjustable with mild solutions.
    • The vascular stent demonstrated superb biocompatibility and non-toxicity in cell viability assays.
    • Ex vivo experiments confirmed the stent's ability to support the left main coronary artery, expanding its cross-section twofold.
    • The stent maintained the artery in an open state post-implantation.

    Conclusions:

    • The novel bilayer two-way shape-memory cellulose vascular stent shows significant promise as an artificial vascular graft.
    • Effective and scalable production of BSMFs can contribute to advancements in biomaterials science.
    • This technology holds potential for practical applications in treating cardiovascular diseases like coronary artery disease.