The Japanese Journal of Rehabilitation Medicine
Online ISSN : 1880-778X
Print ISSN : 0034-351X
ISSN-L : 0034-351X
A DYNAMIC ANALYSIS OF THE FUNCTIONAL PROSTHETIC HANDS AND A VOLUNTARY OPENING AND CLOSING HAND (V. O. C. HAND)
Takashi SUTO
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JOURNAL FREE ACCESS

1981 Volume 18 Issue 6 Pages 335-345

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Abstract
Although usually we use voluntary opening hand or voluntary closing hand for the upper-limb prosthesis, many amputees have various problems about these functional hand components.
Concerning with 1) the traction force of control cable and finger tip distance at the opening, 2) the friction between a hausing and a wire cable, the series of mechanical dynamic analysis were performed in 11 functional hands.
As the results obtained by this analysis, the friction through the hand control system is increased in intensity by the spring-mechanism of the functional hands, so that precise finger movements become obviously more difficult.
Based on these facts, we have developed a voluntary opening and closing hand (V. O. C. hand) without spring-mechanism and used it clinically in 4 upper-limb high amputees, 4 above elbow and 3 below elbow amputees.
The V. O. C. hand is controlled with the movements of the shoulder joint in either affected or non-affected side.
It is an important advantage of the V. O. C. hand that it can be controlled even with weakened muscle power and the feedback-mechanism in the man-prosthetic system is developed effectively.
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© by The Japanese Association of Rehabilitation Medicine
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