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In open-angle glaucoma, the iridocorneal angle remains open, but the trabecular meshwork becomes stiff, slowing down the outflow of aqueous humor. This causes a buildup of aqueous humor in the anterior chamber, leading to a sudden increase in intraocular pressure. The treatment for open-angle glaucoma focuses on reducing the elevated intraocular pressure by either decreasing the secretion of aqueous humor or increasing its outflow.
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Biodegradable material for glaucoma drainage devices - A pilot study in rabbits.

Simar Rajan Singh1, Surinder Singh Pandav1, Sushmita Kaushik1

  • 1Department of Ophthalmology, Postgraduate Institute of Medical Education and Research, Chandigarh, India.

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|May 21, 2024
PubMed
Summary

A novel biodegradable glaucoma drainage device (GDD) made of oxidized regenerated cellulose (ORC) elicited a foreign body reaction in rabbits. This response resolved, forming a loose mesh potentially beneficial for sustained intraocular pressure control.

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Area of Science:

  • Ophthalmology
  • Biomaterials Science
  • Tissue Engineering

Background:

  • Glaucoma drainage devices (GDDs) are crucial for managing intraocular pressure (IOP).
  • Conventional GDDs often develop dense fibrous capsules, potentially limiting their long-term efficacy.
  • Biodegradable materials offer a potential alternative for GDDs to modulate tissue response.

Purpose of the Study:

  • To evaluate the morphological and histological characteristics of the fibrous capsule surrounding a novel biodegradable GDD.
  • To compare the tissue response to a biodegradable GDD made of oxidized regenerated cellulose (ORC) with a silicone tube control.

Main Methods:

  • A prospective, interventional preclinical study was conducted in New Zealand white rabbits.
  • Biodegradable ORC-based GDDs were implanted, and tissue responses were analyzed at 1 and 3 months.
  • Histopathology (H&E, Masson's trichrome) and immunohistochemistry (α-SMA) were used to assess the bleb formation and cellular infiltration.

Main Results:

  • At 1 month, the ORC GDD induced a foreign body reaction with significant inflammatory cell infiltration.
  • By 3 months, the inflammatory response subsided, showing disorganized collagen deposition around the ORC GDD.
  • The silicone tube control exhibited well-organized collagen deposition and greater myofibroblast transformation compared to the ORC GDD.

Conclusions:

  • The tissue response to the biodegradable GDD differs from conventional non-biodegradable devices.
  • A diffuse, loose, vascularized mesh forms around the biodegradable GDD.
  • This unique tissue architecture may offer advantages for sustained IOP control in glaucoma management.