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Proceedings Paper

Load bearing and stiffness tailored NiTi implants produced by additive manufacturing: a simulation study
Author(s): Rasool Rahmanian; Narges Shayesteh Moghaddam; Christoph Haberland; David Dean; Michael Miller; Mohammad Elahinia
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Paper Abstract

Common metals for stable long-term implants (e.g. stainless steel, Titanium and Titanium alloys) are much stiffer than spongy cancellous and even stiffer than cortical bone. When bone and implant are loaded this stiffness mismatch results in stress shielding and as a consequence, degradation of surrounding bony structure can lead to disassociation of the implant. Due to its lower stiffness and high reversible deformability, which is associated with the superelastic behavior, NiTi is an attractive biomaterial for load bearing implants. However, the stiffness of austenitic Nitinol is closer to that of bone but still too high. Additive manufacturing provides, in addition to the fabrication of patient specific implants, the ability to solve the stiffness mismatch by adding engineered porosity to the implant. This in turn allows for the design of different stiffness profiles in one implant tailored to the physiological load conditions. This work covers a fundamental approach to bring this vision to reality. At first modeling of the mechanical behavior of different scaffold designs are presented as a proof of concept of stiffness tailoring. Based on these results different Nitinol scaffolds can be produced by additive manufacturing.

Paper Details

Date Published: 20 March 2014
PDF: 8 pages
Proc. SPIE 9058, Behavior and Mechanics of Multifunctional Materials and Composites 2014, 905814 (20 March 2014); doi: 10.1117/12.2048948
Show Author Affiliations
Rasool Rahmanian, The Univ. of Toledo (United States)
Narges Shayesteh Moghaddam, The Univ. of Toledo (United States)
Christoph Haberland, The Univ. of Toledo (United States)
David Dean, The Ohio State Univ. (United States)
Michael Miller, The Ohio State Univ. (United States)
Mohammad Elahinia, The Univ. of Toledo (United States)


Published in SPIE Proceedings Vol. 9058:
Behavior and Mechanics of Multifunctional Materials and Composites 2014
Nakhiah C. Goulbourne; Hani E. Naguib, Editor(s)

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