An input command controller (A) provides logic function selection signals and proportional signals. The signals are generated by movement of a ball member (12) and socket member (14) relative to two orthogonal axes. When the joystick is implanted, a transmitter (50) transmits the signals to a patient...http://www.google.es/patents/US5769875?utm_source=gb-gplus-sharePatente US5769875 - Functional neuromusclar stimulation system
