Bending fatigue and spring back properties of implant rods made of β-type titanium alloy for spinal fixture

Kengo Narita, Mitsuo Niinomi, Masaaki Nakai, Toshikazu Akahori, Harumi Tsutsumi, Kazuya Oribe

研究成果: Conference contribution

6 被引用数 (Scopus)

抄録

Implanting a spinal fixture using metallic rods is one of the effective treatments for spinal diseases. Because cyclic bending stress is loaded on the implant rods when patients move their upper bodies in daily life, bending fatigue properties are important for the implant rod. Further, the implant rods are bended plastically into a curved shape of spine by hand in a surgical operation. In that case, keeping shape is important, namely bending spring back properties are important factors. On the other hand, a biomedical β-type titanium alloy, Ti-29Nb-13Ta-4.6Zr (mass %) alloy (TNTZ), has been developed by the authors. Currently, this alloy are investigated to be applied to the above mentioned implant rod practically. Therefore, four-point bending fatigue and three point-bending spring back properties of TNTZ subjected various heat treatments were examined in this study. TNTZ rods were subjected to solution treatment, and then some of them were subjected to aging treatment at 673 K or 723 K for 259.2 ks, followed by water quenching. Then, four-point bending fatigue and three-point bending spring back tests were carried out on TNTZ rods subjected to the various heat treatments mentioned above. The bending fatigue strength at 2.5 million cycles in the high cycle fatigue region are not much different among any TNTZ rod. However, the bending fatigue strength of the Ti-6Al-4V ELI (Ti64) rod exceeds the fatigue strengths of every TNTZ rods in both low and high cycle fatigue regions. On the other hand, the lower spring back, which is a favorable property, was obtained for some TNTZ rod than Ti64 rod.

本文言語English
ホスト出版物のタイトルTHERMEC 2009 Supplement
ページ400-404
ページ数5
DOI
出版ステータスPublished - 2010
外部発表はい
イベント6th International Conference on Processing and Manufacturing of Advanced Materials - THERMEC'2009 - Berlin, Germany
継続期間: 2009 8 252009 8 29

出版物シリーズ

名前Advanced Materials Research
89-91
ISSN(印刷版)1022-6680

Other

Other6th International Conference on Processing and Manufacturing of Advanced Materials - THERMEC'2009
CountryGermany
CityBerlin
Period09/8/2509/8/29

ASJC Scopus subject areas

  • Engineering(all)

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