A device for positioning a prosthetic device comprising: two patient sensors (111,112) to be connected to a patient for sensing an input from the patient, wherein the input from the patient is a contraction or expansion of a patient's muscle; a control system in communication with the patient sensors (111,112); a motor drive in communication with the control system and connected to the prosthetic device, the prosthetic device being a hand comprising a palm, a thumb, fingers other than the thumb; and an angle sensor for sensing an angle position of the thumb comparative to the palm and emitting a signal based on the angle position of the thumb, wherein the control system is adapted to operate the motor drive to move the fingers by manipulating the motor drive based upon inputs received from the patient sensors (111,112) and the signal emitted by the angle sensor, characterized in that the motor drive is adapted to move the fingers towards the palm when the angle position of the thumb is extended furthest from the palm; and/or the control system is adapted to suspend use of the index finger and the motor drive is adapted to move the remaining fingers towards the palm, when the angle position of the thumb is extended approximately thirty degrees away from the palm; and/or; the control system is adapted to activate use of the thumb and index finger and to suspend use of the remaining fingers, when the angle position of the thumb is extended approximately sixty degrees away from the palm; and/or the motor drive is adapted to extend all of the fingers away from the palm when the angle position of the thumb is closest to the palm. two patient sensors (111,112) to be connected to a patient for sensing an input from the patient, wherein the input from the patient is a contraction or expansion of a patient's muscle; a control system in communication with the patient sensors (111,112); a motor drive in communication with the control system and connected to the prosthetic device, the prosthetic device being a hand comprising a palm, a thumb, fingers other than the thumb; and an angle sensor for sensing an angle position of the thumb comparative to the palm and emitting a signal based on the angle position of the thumb, wherein the control system is adapted to operate the motor drive to move the fingers by manipulating the motor drive based upon inputs received from the patient sensors (111,112) and the signal emitted by the angle sensor, characterized in that the motor drive is adapted to move the fingers towards the palm when the angle position of the thumb is extended furthest from the palm; and/or the control system is adapted to suspend use of the index finger and the motor drive is adapted to move the remaining fingers towards the palm, when the angle position of the thumb is extended approximately thirty degrees away from the palm; and/or; the control system is adapted to activate use of the thumb and index finger and to suspend use of the remaining fingers, when the angle position of the thumb is extended approximately sixty degrees away from the palm; and/or the motor drive is adapted to extend all of the fingers away from the palm when the angle position of the thumb is closest to the palm.