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Related Experiment Videos

Tissue interaction with hydrogel sponges implanted in the rabbit cornea

G J Crawford1, I J Constable, T V Chirila

  • 1Lions Eye Institute, Perth, Australia.

Cornea
|July 1, 1993
PubMed
Summary

Poly(2-hydroxyethyl methacrylate) (PHEMA) hydrogel sponges show promise for composite keratoprosthesis. These biocompatible sponges integrate well with corneal tissue, allowing cellular invasion and vascularization for stable integration.

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Area of Science:

  • Ophthalmology
  • Biomaterials Science
  • Tissue Engineering

Background:

  • Composite keratoprostheses aim to restore vision by replacing damaged corneas.
  • Peripheral integration of artificial materials with host corneal tissue remains a challenge.
  • Poly(2-hydroxyethyl methacrylate) (PHEMA) hydrogel sponges have demonstrated potential for cellular infiltration.

Purpose of the Study:

  • To evaluate the biocompatibility and tissue integration of PHEMA hydrogel sponges in the rabbit cornea.
  • To assess the host tissue response to PHEMA sponges implanted in central and limbal corneal regions.
  • To determine the suitability of PHEMA sponges as peripheral materials for composite keratoprostheses.

Main Methods:

  • PHEMA hydrogel sponges (10-30 micron pore size), impregnated with collagen, were implanted in rabbit corneas.

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  • Clinical examination using slit-lamp biomicroscopy was performed up to 6 months post-implantation.
  • Histopathological analysis, including light and transmission electron microscopy, was conducted on excised implants at various time points.

    • Main Results:

    • PHEMA sponges were well-tolerated by corneal stromal and limbal tissues, with no capsule formation observed.
    • Corneal fibroblasts and capillaries successfully invaded the sponge's internal voids to all depths.
    • Invading cells remained viable and active throughout the 6-month follow-up period.

    Conclusions:

    • Hydrophilic PHEMA hydrogel sponges are biocompatible and promote cellular infiltration in the cornea.
    • These sponges facilitate robust integration with host corneal tissue, suggesting their potential as peripheral keratoprosthetic materials.
    • PHEMA sponges may offer a permanent and tight fusion between keratoprostheses and host tissue, improving long-term outcomes.