Development of myoelectric hand with sensory feedback system

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The purpose of this study was to develop a new myoelectric hand with sensory feedback system and to evaluate the usefulness of the sensory feedback system.1. Decision of an information transmission method of sensory feedback systemThe sensory feedback system developed in this study transmittedan information about prasping force of myoelectrictric hand to its user with vibrotactile stimulus. The modulation method adopted an amplitude modulation and the stimulating position was the central part on the inner side of upper arm yielding to being contained inside a socket of a front arm artificial hand.2. Decision of vibrotactile stimulus frequency.It is necessary to choose themost sensitive frequency for thevibrotactile stimulus frequency. We presented vibrotactile stimulus with the range of frequency from 1 to 700 Hz to the upper arm of three health men. For each frequency, we measured the smallest amplitude of stimulation which the subjects could sense. Threshold for vibrotactile stimulus showed low at the frequency of 250-350 Hz. However with this frequency, a vibration sound occurs and displeases a myoelectric hand user. Therefore we adopted 10 Hz for the stimulation frequency because the stimulation with this frequency shows the lowest threshold for vibrotactile stimulus in the range less than audible frequency.3. Production of myoelectric hand with sensory feedback systemAn electronic control circuit for the myoelectrichand was miniaturized in order to be carried during daily life.Object grasping experimentUsefulness of the sensory feedback system was shown by the experiment, where a healthy subject was grasping soft objects with the myoelectric hand.