Body powered hand prostheses require high physical user effort. This is caused by the stiffness of the cosmetic covering, or cosmetic glove. This paper aims to present a new concept of a mechanism for the compensation of the nonlinear stiffness of body powered hand prostheses by using static balancers with a nonlinear behavior. This concept is based on a cooperative action of snap-through behavior in multiple bi-stable spring mechanisms to create the nonlinear balancing force. To demonstrate the efficiency of the concept, an optimized design for a case study of a child-size hand prosthesis is also presented. A pattern search method was applied for the optimization. As a result, the calculated stiffness and thereby the operating effort was reduced by 96%. It can be concluded from the conceptual and numerical results that the presented concept provides a highly efficient solution to the discussed problem.
Stiffness Compensation Mechanism for Body Powered Hand Prostheses with Cosmetic Covering
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Tolou, N., Smit, G., Nikooyan, A. A., Plettenburg, D. H., and Herder, J. L. (March 13, 2012). "Stiffness Compensation Mechanism for Body Powered Hand Prostheses with Cosmetic Covering." ASME. J. Med. Devices. March 2012; 6(1): 011004. https://doi.org/10.1115/1.4005781
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