An exoskeleton is a mechatronic system which has the goal of to ensure an extra strength when muscles of humans are affected and don’t achieve the driving force necessary. As structural exoskeleton are used orthotics and the prostheses. The orthosis is a medical device which is applied at the level of a body segment in the goal of prevention or correction the gap that segment. The prosthesis is a medical device which makes part of the biomechatronics field and which deals with the substitution a segment of the human body. In this paper it illustrate how to design a structural exoskeleton.

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Powered robotic exoskeletons used to assist in human locomotion require a lot of energy. The Walking Assist Machine Using Crutches (WAMC) is such an exoskeleton used to assist paraplegic people in walking. It uses telescopic links driven by linear actuators with electro motors and people wearing the device move crutches themselves. An evaluation was done to see if the implementation of springs could lead to a reduction in required motor energy. A computer simulation calculating the movement of such a configuration with springs indeed showed a reduction in required motor energy and also effected in a higher walking speed. The user had to spend more effort to swing the crutches.

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