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At present the world is moving into the aging society. Upper limb muscle atrophy makes the
majority of elder people unable to achieve functions of smooth reachings. To solve this problem，
a spring-string device is designed and can make the elbow joint flexing against the gravity by use
of the principle of tapeline's springback, which can assist the movement of elbow joint, improve
the elderly health and increase their self-confidence of returning to family and society.
Hubei University Of Technology