Surface Treatments of Nearly Equiatomic NiTi Alloy (Nitinol) for Surgical Implants

Kwok, Dixon T. K.; Schulz, Martin; Hu, Tao; Chu, Chenglin; Chu, Paul K.

doi:10.5772/13212

Cited by 3 publications

(1 citation statement)

References 34 publications

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“…Nevertheless, a special processing or functionalization of the TiNi surface is required to eliminate the infectious complications during implantation, since the native material has no pronounced antibacterial effect [7,8]. In addition, when TiNi implant is operated in the corrosive-dynamic conditions of a biological environment, a gradual release of nickel cations can occur, causing toxic or allergic reactions [1][2][3]7,9]. This process can be prevented through the covering of TiNi surface by materials with high corrosion resistance, among which noble metals (Pt, Ir, Au) are of particular interest.…”

Section: Introductionmentioning

confidence: 99%

MOCVD of Noble Metal Film Materials for Medical Implants: Microstructure and Biocompatibility of Ir and Au/Ir Coatings on TiNi

et al. 2021

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Noble metals such as Ir, Pt, Au are promising as coatings for metal medical implants to improve biocompatibility and corrosion resistance. Moreover, these coatings can be used as a basis for the further formation of bimetallic hetero-structures with enhanced antibacterial properties. In this work, we develop an approach to obtain such coatings by metal-organic chemical vapor deposition (MOCVD). We have been focused on the formation of Ir coating with developed morphology and subsequent discrete Au coating onto the titanium nickelide (TiNi) implant material. Iridium was deposited in an oxidizing atmosphere from the volatile precursor [Ir(cod)(acac)] (cod = cyclooctadiene-1,5, acac = acetylacetonate-anion). The effects of the deposition temperature (290–350 °C) and amount of introduced oxygen on the composition (Ir, Ir + IrO2) and microstructure of the samples were studied. Hetero-metallic Au/Ir coatings were obtained using [(CH3)2Au(thd)] precursor (thd = dpm = dipivaloylmethanate-anion) at a deposition temperature of 240 °C in the presence of oxygen. To assess the biocompatibility, the toxicity of Ir/TiNi, Au/Ir/TiNi, and uncoated TiNi in relation to human embryonic stem cell line Man-1 was examined after 1, 3, and 5 days of incubation. The results obtained were explained based on the coating microstructures.

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Section: Introductionmentioning

confidence: 99%

MOCVD of Noble Metal Film Materials for Medical Implants: Microstructure and Biocompatibility of Ir and Au/Ir Coatings on TiNi

et al. 2021

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A review on surface modification of NiTinol for biomedical applications

Billah,

Aquib,

Dey

2024

J Mater Sci

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Structure and properties of surface layer of TiNi alloy subjected to ion-plasma- and ultrasonic treatment

Rubanik,

Bahrets,

Rubanik

et al. 2024

Vescì Akademìì navuk Belarusì. Seryâ fizika-tehničnyh navuk

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The paper presents the results of research on morphology, elemental composition, microhardness, corrosion properties of the surface layer of TiNi alloy subjected to ion-plasma (vacuum-arc method) deposition of TiN coating and ultrasonic treatment (UT) with different number of passes (n). The SEM method showed that ultrasonic treatment provides a significant reduction in the amount of the droplet phase on the TiN coating surface. The surface discontinuity of TiN coating at local points was observed with an increase in the number of passes during ultrasonic treatment. The effect of combined processing methods on the microhardness of TiNi sample was studied. It was shown that the synergistic effect can be observed for two hardening methods. The combined strengthening method increased the microhardness of TiNi alloy (1.6 GPa in the as-received state): due to the deposition of a TiN coating – up to 10.9 GPa, due to subsequently ultrasonic treatment – up to 14.5–18.4 GPa depending on the number of passes. For UT + TiN scheme, it was shown that the open circuit potential Ecorr was about –250 mV which is practically independent of the number of passes and determined by the potential value of TiN coating. For TiN + UT scheme, it was found that with an increase in the number of passes, the value of Ecorr shifts towards more negative values approaching the open circuit potential value of the TiNi sample in the as-received state (–350 mV). The analysis of Scanning Vibrating Electrode Technique (SVET) results showed high electrochemical compatibility of substrate (TiNi) and coating (TiN) materials in a chloride environment with minimal current density fluctuations for the samples subjected to UT + TiN and TiN + UT (n = 1). The proposed method for TiNi alloy treatment according to TiN + UT scheme (n = 1) promotes an improvement of surface morphology and corrosion resistance.

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Surface Treatments of Nearly Equiatomic NiTi Alloy (Nitinol) for Surgical Implants

Cited by 3 publications

References 34 publications

MOCVD of Noble Metal Film Materials for Medical Implants: Microstructure and Biocompatibility of Ir and Au/Ir Coatings on TiNi

MOCVD of Noble Metal Film Materials for Medical Implants: Microstructure and Biocompatibility of Ir and Au/Ir Coatings on TiNi

A review on surface modification of NiTinol for biomedical applications

Structure and properties of surface layer of TiNi alloy subjected to ion-plasma- and ultrasonic treatment

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