A biointerface membrane for an implantable device including a nonresorbable solid portion with a plurality of interconnected cavities therein adapted to support tissue ingrowth in vivo, and a bioactive agent incorporated into the biointerface membrane and adapted to modify the tissue response is provided....http://www.google.ca/patents/US20060204536?utm_source=gb-gplus-sharePatent US20060204536 - Biointerface membranes incorporating bioactive agents
