Evaluation of mesoporous silicon/polycaprolactone composites as ophthalmic implants

Area of Science:

• Biomaterials Science
• Ophthalmology
• Tissue Engineering

Background:

• Porous silicon (pSi) offers unique properties for biomedical applications.
• Biodegradable polymers like polycaprolactone (PCL) are suitable for implants.
• Combining pSi with PCL could create advanced ophthalmic scaffolds.

Purpose of the Study:

• To evaluate porous silicon (pSi) encapsulated in polycaprolactone (PCL) microfibers for ophthalmic applications.
• To assess cell attachment and in vivo biocompatibility of these novel composite materials.

Main Methods:

• Fabrication of PCL microfibers with pSi particles (6 and 20 wt.%) in two surface chemistries (hydride-terminated and oxidized).
• In vitro cell attachment assay using a human lens epithelial cell line (SRA 01/04).
• In vivo biocompatibility assessment via subconjunctival implantation in rats for 8 weeks.

Main Results:

• Significant attachment of epithelial cells to all tested pSi/PCL scaffolds within 24 hours.
• No visible infection, inflammation, or ocular surface erosion observed after 8 weeks of in vivo implantation.
• pSi particle concentration and surface chemistry did not impede cell attachment or biocompatibility.

Conclusions:

• Composite scaffolds of porous silicon (pSi) and polycaprolactone (PCL) are suitable for ophthalmic applications.
• These materials demonstrate excellent biocompatibility and promote epithelial cell attachment.
• The developed scaffolds show promise for tissue engineering and controlled release applications in ophthalmology.