A method and device for assembling a multi-phase implant for insertion into a patient defect site that spans more than one tissue type. The assembly device comprises a base and cover portion for constructing a two-phase implant separated by a membrane. A repeating intermediate portion that connects the base and cover can be used to construct implants with more than two phases, with each phase separated by a membrane. The invention is also for multi-phase implants, wherein adjacent phases are separated by a membrane. In an embodiment, the implant phases are selectively loaded with a bioactive agent selected to promote tissue repair in the tissue surrounding each phase.
