This paper presents a semi active orthosis designed for recovering the mobility on a paralyzed hand because of a fifth cervical injury, C5. The orthosis is based on a six bar mechanism and a circular slide, using the hand as a part of the mechanism. Other similar devices were developed around the world, nevertheless this design is independent of an actuator, and can be used with or without one. As a result, the mechanism and tests with the user are presented; the user of the mechanism can hold different objects with his hand using the orthosis.

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