To provide a biocompatible membrane composite capable of providing an environment capable of mitigating or controlling a
foreign body reaction.SOLUTION: The membrane composite includes a conformable layer and a vascularizing layer. A reinforcing component can optionally be included to provide support to the biocompatible membrane composite invivo and prevent
distortion of the membrane composite. The relief layer may be coupled or attached to the implantable device and / or the
cell system. The biocompatible membrane composite can be used as a
surface layer for implantable devices or
cell systems that require vascularization for function but require protection from a host immune response, such as the formation of
foreign body giant cells. The biocompatible membrane composite can partially or completely cover the exterior of the implantable device or
cell system. The relief layer is positioned between the implantable device or
bioactive scaffold and the vascularizing layer.SELECTED DRAWING: Figure 7