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  • Functional wrist-hand upper-limb orthoses designed to grasp and release objects using a ratchet mechanism and power external to the wrist or hand. These orthoses typically consist of prefabricated devices, including a semi-rigid cuff or sleeve fixed at the forearm with one or more straps, soft pads or bands fixed on the hand, and an adjustable ratchet mechanical joint that permits closing the hand in several discrete positions and making it possible to pinch objects. Ratchet mechanism functional orthoses are operated by power external to the wrist and/or hand muscles (e.g., using the other arm, pressing with the chin), providing support, supplementing, and/or augmenting the hand 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.
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