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Theoretical and experimental studies for an orthopedic staple made up Nitinol

D. TARNITA1,* , D. BOLCU1, C. BERCEANU1, FL. CISMARU1

Affiliation

  1. University of Craiova, Faculty of Mechanics, Department of Applied Mechanics

Abstract

Super-elastic NiTi has become a very important biomaterial, successfully used for technical and design issues relating to the miniaturization of medical devices and the increasing trend for less invasive and less traumatic procedures. In this paper, we present the elasticity matrix, the decomposition of the elasticity matrix, the eigenvalues and the eigenvectors for the crystallographic phases of Nitinol: trigonal, cubic, monoclinic and orthorhombic. In order to determine the variation law for the compression force developed by the Nitinol orthopaedic staple as function of temperature and, also, to validate the compression potential of the staple through constant pressure at the temperature of the human body, we made an experimental study, using an experimental stand. Using the video capture SIMI Motion software, the kinematical parameters of the both extremities of the staple were obtained. The analytical variation in time of the compression force exerted by the Nitinol staple is also obtained. The data acquired through this methods can be used to corroborate the experimental kinematical parameters with kinematical parameters obtained using various analytical or computer aided simulations in order to confirm a certain mechanical model..

Keywords

Nitinol, crystallographic phases, spectral decomposition, experimental studies, orthopedic staple.

Submitted at: Sept. 20, 2010
Accepted at: Nov. 19, 2010

Citation

D. TARNITA, D. BOLCU, C. BERCEANU, FL. CISMARU, Theoretical and experimental studies for an orthopedic staple made up Nitinol, Journal of Optoelectronics and Advanced Materials Vol. 12, Iss. 11, pp. 2323-2332 (2010)