A coating for an orbital implant where the coating has an anterior portion
having a different, longer term bioabsorbability than a posterior
portion. This allows the implant to have a smooth surface for insertion
and to provide reduced irritation to neighboring tissues, to help prevent
exposure of the porous core of the implant, and to provide a stable
anchorment for extraocular muscles, but which also encourages rapid
fibrovascular ingrowth. The coating is marked with a visual indicator to
facilitate proper orientation. Shell materials are further selected to
allow for sterile packaging, the securing of therapeutic agents thereon,
and to provide adequately strong securing of the coating to the core.
Apertures are formed through the coating to enhance fluid flow to and
from the core, and to provide exposure of the surface of the core to
extraocular muscles, and for sutures. The apertures are sized and shaped
to reduce irritating surface contact with orbital tissues.
