Tissue expander with drug delivery capability

A method of making an expander and drug delivery device, the method comprising:

• forming an expansion cavity with a first membrane, wherein the first membrane is a non-permeable shell;
• mounting an expansion cavity port in communication with the expansion cavity, wherein the expansion cavity port provides access to the expansion cavity, and wherein the non-permeable shell is flexible such that the non-permeable shell inflates in response to insertion of a substance into the expansion cavity via the expansion cavity port;
• forming a drug cavity with a second membrane such that the drug cavity is adjacent to the expansion cavity;
• and
• mounting a drug cavity port in communication with the drug cavity, wherein the drug cavity port is sized to receive a therapeutic solution for delivery to a patient.