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Predicting microstructure development during casting of drug-eluting coatings.

David M Saylor1, Jonathan E Guyer, Daniel Wheeler

  • 1Division of Chemistry and Materials Science, Office of Science and Engineering Laboratories, Center for Devices and Radiological Health, Food and Drug Administration, Silver Spring, MD 20993, USA. david.saylor@fda.hhs.gov

Acta Biomaterialia
|September 23, 2010
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Summary

A new model simulates microstructure development in drug-eluting coatings, revealing how manufacturing conditions impact drug release from medical devices.

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Area of Science:

  • Materials Science
  • Chemical Engineering
  • Biomedical Engineering

Background:

  • Drug-eluting coatings on medical devices are crucial for controlled drug delivery.
  • Microstructure development in these coatings significantly influences drug release kinetics and device performance.
  • Existing models may not fully capture the complex interplay between manufacturing processes and coating microstructure.

Purpose of the Study:

  • To develop a novel diffuse interface formulation for modeling microstructure evolution in drug-eluting coatings.
  • To establish quantitative relationships between process variables, coating microstructure, and drug release performance.
  • To provide a computational tool for optimizing the design and manufacturing of drug-eluting coatings.

Main Methods:

  • A time-dependent reference frame was used to derive computationally viable model equations.
  • The model was applied to evaluate the impact of solvent, coating thickness, and evaporation rate on microstructure.
  • The formulation was extended to model layered or multi-pass coating applications.

Main Results:

  • Manufacturing conditions, such as solvent choice and evaporation rate, can strongly influence coating microstructure and drug release.
  • The model demonstrates a nearly discontinuous effect of process modifications on microstructure.
  • The model successfully predicts microstructure development for both single and multi-pass coating processes.

Conclusions:

  • The developed diffuse interface model effectively predicts microstructure formation and its impact on drug release.
  • This tool reduces empiricism in material selection and process design for drug-eluting coatings.
  • The model facilitates tailored microstructure design for desired drug release profiles in medical devices.