2010 Design of Medical Devices Conference Abstracts

Stiffness Compensation in Hand Prostheses With Cosmetic Coverings Using Statically Balanced Mechanisms PUBLIC ACCESS

[+] Author and Article Information
Nima Tolou, Gerwin Smit, Ali Asadi Nikooyan, Dick Plettenburg, Just Herder

Delft University of Technology

J. Med. Devices 4(2), 027527 (Aug 10, 2010) (1 page) doi:10.1115/1.3443321 History: Published August 10, 2010


Although hand prostheses with a cosmetic covering are commercially available for disabled people, the operating effort due to the stiffness of the mechanism is high. This results in high power requirements. This paper aims to present a new concept of mechanisms for the compensation of the nonlinear stiffness of hand prostheses by using statically balanced mechanisms with a nonlinear behavior. This concept was based on a combination of stability phases of snap-through buckling in bistable 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-sized 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.

Copyright © 2010 by American Society of Mechanical Engineers
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