Load bearing and stiffness tailored NiTi implants produced by additive manufacturing: a simulation study

Rasool Rahmanian; Narges Shayesteh Moghaddam; Christoph Haberland; David Dean; Michael Miller; Mohammad Elahinia

doi:10.1117/12.2048948

20 March 2014 Load bearing and stiffness tailored NiTi implants produced by additive manufacturing: a simulation study

Rasool Rahmanian, Narges Shayesteh Moghaddam, Christoph Haberland, David Dean, Michael Miller, Mohammad Elahinia

Proceedings Volume 9058, Behavior and Mechanics of Multifunctional Materials and Composites 2014; 905814 (2014) https://doi.org/10.1117/12.2048948
Event: SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring, 2014, San Diego, California, United States

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.

Citation Download Citation

Rasool Rahmanian, Narges Shayesteh Moghaddam, Christoph Haberland, David Dean, Michael Miller, and Mohammad Elahinia "Load bearing and stiffness tailored NiTi implants produced by additive manufacturing: a simulation study", Proc. SPIE 9058, Behavior and Mechanics of Multifunctional Materials and Composites 2014, 905814 (20 March 2014); https://doi.org/10.1117/12.2048948

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available