Abstract: The invention relates to an implantable system (10) comprising a first device (20), called a centralization device, which is able to be fixed in a fixation position to a wall of the stomach of a patient, the centralization device (20) being received in the stomach when the centralization device (20) is in the fixation position, and at least one second device (25). The implantable system (10) is characterized in that the centralization device (20) comprises a controller (45), an electrical supply (55) and an emitter/receiver (60) to permit communication between the centralization device (20) and the second device (25) when the second device (25) is in a functioning position, the second device (25) being situated outside the body of the patient when the second device (25) is in the functioning position.