This paper presents the design of a passive leg orthosis for gait correction of human subjects. During normal walk, the joints of a human leg, namely, the hip, knee, and ankle satisfy certain functional relationships. During post stroke and other neural disorders, the gait deviates substantially from this normal gait. Hence, there is a need to design rehabilitation machines for gait training. Our design targets the sagittal plane motion of the leg, i.e., it considers the hip and knee flexion and extension motions. The paper describes the details of the cam design and results of a demonstration prototype.

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