System for controlling a controllable stomach band (1) comprises a memory for memorizing the recorded pressure values and a device for processing the time curve for the received pressure values. An independent claim is also included for a method for controlling an implanted stomach band using the above system. Preferred Features: The system has a transfer device formed by a high frequency emitter and a receiving device formed by a high frequency receiver. A pressure sensor (7) formed by a piezoelectric sensor is also provided.
