Fig. 2

Patient’s active force as a function of the distance from the rotation axis. The curves represent the patient’s active force required to activate the LeMMS as a function of the distance from the rotation axis for different finger weights (respectively 0.6, 0.8, 1.0, 1.2 N). These values were synthetically selected from a realistic range of finger weights. When the patient’s active force is negative, then the switch remains always activated. In our case, to allow activation, the finger needs to be moved toward the rotation axis. In other words, independently of the finger weight, a small activation force of the LeMMS can be easily found by sliding the finger over the device surface