Abstract
We developed an upper-limb motion-assist device for high cervical spinal cord injury, which makes it possible for a patient to move a paralyzed arm in the intended way by using residual functions of the neck and head. This device consists of an upper-limb motion-assist mechanism, a control system, and a sensor that measures the motion of the head. The upper limb is always supported in various postures by the same force as gravity exerts, due to the elastic force of the spring, and this device can be adjusted for upper limbs of different weights. The three-dimensional position of the wrist and the pronosupination motion are assisted by 4 DC motors controlled by a PC. For self-motion control, an acceleration sensor and switches are applied to detect head motion. This device can assist with upper-limb motions, such as are required to eat independently, in response to the head movements of the users.
