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PEG-Based Hydrogel Coatings: Design Tools for Biomedical Applications.

Megan Wancura1, Abbey Nkansah2, Andrew Robinson2

  • 1Department of Chemistry, The University of Texas at Austin, Austin, TX, 78712, USA.

Annals of Biomedical Engineering
|February 11, 2023
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Summary

Polyethylene glycol (PEG)-based hydrogel coatings prevent device issues from biological responses. This study compares two methods, offering a design toolbox for antifouling medical device coatings.

Keywords:
Hydrogel coatingsPhotoinitiationPoly(ethylene glycol) hydrogelsRedox initiation

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Area of Science:

  • Biomaterials Science
  • Polymer Chemistry
  • Medical Device Engineering

Background:

  • Undesired biological responses to medical devices cause failure, hindering clinical translation.
  • Polyethylene glycol (PEG)-based hydrogel coatings offer antifouling properties to mitigate bacterial infection, thrombosis, and foreign body reactions.
  • Applying hydrogel coatings requires careful material factor consideration for diverse substrates.

Purpose of the Study:

  • To systematically investigate and compare two hydrogel coating methods: photoinitiated and diffusion-mediated, redox-initiated.
  • To analyze the impact of coating method, substrate, and composition on hydrogel coating thickness.
  • To understand structure-property relationships for designing effective hydrogel coatings for medical devices.

Main Methods:

  • Investigated traditional photoinitiated hydrogel coatings.
  • Developed and examined diffusion-mediated, redox-initiated hydrogel coatings.
  • Systematically varied method, substrate, and compositional parameters to assess coating thickness.

Main Results:

  • Presented the effects of method, substrate, and composition on hydrogel coating thickness.
  • Identified the necessity of investigating cure rate and macromer viscosity for redox-initiated coatings with high molecular weight macromers.
  • Established structure-property relationships for hydrogel coating design.

Conclusions:

  • Hydrogel coatings, particularly PEG-based ones, are crucial for improving medical device performance by reducing biological interactions.
  • Two distinct coating methods were evaluated, providing insights into their suitability for different applications.
  • The findings offer a practical framework for tailoring hydrogel coatings to specific medical devices, enhancing their biocompatibility and efficacy.