Fig. 3
From: Development of 3D-printed myoelectric hand orthosis for patients with spinal cord injury
Control mode change of the device according to sEMG signal. a Raw and RMS sEMG signal in each situation. Note that the sEMG of usual muscle movements, such as picking up objects and bringing them to oneself, rarely exceeds the preset value (for example, 80% of the maximal RMS value). Therefore, the orthosis was not activated in such contraction level. b When the RMS value of the sEMG signal exceeds the threshold value, the myoelectric orthosis activates and the hand is closed by the exoskeleton. If the signal exceeds the threshold again, then the orthosis turns back and the hand opens