A device intended for implantation to develop tissue (skin) coverage by intermittent expansion, which can be remotely controlled by the patient or physician, prior to the placement of a permanent breast implant. Expansion is achieved by electronic release of gas [e.g., carbon dioxide (CO2)] from a pressurized container within the device. It typically consists of an outer silicone shell, an inner gas barrier, a reservoir of gas with valve, and electronics. It is intended to remain in situ until desired expansion is achieved, when it is replaced with the breast implant. This is a single-use device.