In this paper we present a new compact and portable rehabilitation system. It's role is to provide therapeutic passive motions of the hand. The anatomical characteristics and the biomechanics of the wrist are emphasized. The target anatomical movements of the hand are flexion-extension and abduction-adduction. A comparative study of similar devices is presented. The principle of operation of chosen variant is given. Its design methodology is detailed. A functional prototype was developed and its functional parameters are presented.