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Wrist-hand upper-limb orthoses designed to make possible and/or improve the functional activities of the wrist joint and hand during common daily activities using a mechanism that is triggered or propelled by the user. These orthoses typically consist of prefabricated devices, including a mechanism that permits closing the hand in several discrete positions making possible to pinch objects. Wrist-hand functional orthoses are operated by power external to the wrist and/or hand muscles (e.g., using the other arm). They provide support, supplement, and/or augment the limb functions. They are used for daily activities such as feeding, grooming, and writing by patients with paralysis or severe weakness of the hand and wrist muscles. Dedicated functional wrist-hand orthoses that use ratchet mechanisms or are driven by transmitting power from the wrist extensor muscles to the fingers (i.e., wrist driven) are available, and electrically powered orthoses are also available.
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