Medical Application of NiTi Shape Memory Alloy in China

Chu, Y.; Dai, Keren; Zhu, Ming; Xu, Meiling

doi:10.4028/www.scientific.net/msf.327-328.55

Cited by 16 publications

(6 citation statements)

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“…15.23a. NiTi orthodontic archwire was first produced in batches and clinically used in China in the beginning of 1980s [128]. Due to its unique property--superelasticity--the wire exerts gentle and retentive force to teeth, which is superior to stainless steel wire.…”

Section: Medical Applicationsmentioning

confidence: 99%

Titanium and Titanium Alloy Applications in Medicine

Jackson

Kopač

Balažic

et al. 2016

Surgical Tools and Medical Devices

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Titanium is a transition metal. It is present in several minerals including rutile and ilmenite, which are well dispersed over the Earth's crust. Even though titanium is as strong as some steels, its density is only half of that of steel. Titanium is broadly used in a number of fields, including aerospace, power generation, automotive, chemical and petrochemical, sporting goods, dental and medical industries. The large variety of applications is due to its desirable properties, mainly the relative high strength combined with low density and enhanced corrosion resistance. This chapter discusses the applications of titanium and its alloys in the medical field. Metallurgical Aspects IntroductionAmong the metallic materials, titanium and its alloys are considered the most suitable materials in medical applications because they satisfy the property requirements better than any other competing materials, such as stainless steels, CrCo alloys, commercially pure (CP) Nb and CP Ta [1][2][3][4][5][6]. In terms of biomedical applications, the properties of interest are biocompatibility, corrosion behavior, mechanical behavior, ability to be processed, and availability [7][8][9].Titanium may be considered as being a relatively new engineering material. It was discovered much later than the other commonly used metals, its commercial application started in the late 1940s, mainly as structural material. Its usage as implant material began in the 1960s [10]. Despite the fact that titanium exhibits superior corrosion resistance and tissue acceptance when compared with stainless M.J. Jackson (&) Kansas State University, Salina, KS, USA e-mail: jacksonmj04@yahoo.com [11]. To overcome such restrictions, CP titanium was substituted by titanium alloys, particularly, the classic grade 5, i.e., Ti-6Al-4V alloy. The Ti-6Al-4V α + β-type alloy, the most worldwide utilized titanium alloy, was initially developed for aerospace applications [12,13]. Although this type of alloy is considered a good material for surgically implanted parts, recent studies have found that vanadium may react with the tissue of the human body [2]. In addition, aluminum may be related with neurological disorders and Alzheimer's disease [2]. To overcome the potential vanadium toxicity, two new vanadium-free α + β-type alloys were developed in the 1980s. Vanadium, a β-stabilizer element, was replaced by niobium and iron, leading to Ti-6Al-7Nb and Ti-5Al-2.5Fe (α + β)-type alloys [4,6,14]. While both alloys show mechanical and metallurgical behavior comparable to those of Ti-6Al-4V, a disadvantage is that they all contain aluminum in their compositions.In recent years, several studies have shown that the elastic behavior of α + β-type alloys is not fully suitable for orthopedic applications [15][16][17][18]. A number of studies suggest that unsatisfactory load transfer from the implant device to the neighboring bone may result in its degradation [9]. Also, numerical analyses of hip implants using finite element method indicate that the use of biomaterials wi...

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Section: Medical Applicationsmentioning

confidence: 99%

Titanium and Titanium Alloy Applications in Medicine

Jackson

Kopač

Balažic

et al. 2016

Surgical Tools and Medical Devices

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“…Therefore, their use in load-bearing applications seems more adequate than other metallic materials. Their ability to deliver a uniform compressive stress after the recovery of a prestrain upon heating could make them useful in applications such as staples for osteotomies, fracture repair (Chu et al 2000), internal fixators for long bone shafts, spinal correctors, vertebral spacers and anchoring of prostheses (Duerig et al 1996). Finally, the almost constant force they can produce over a very large displacement in their pseudo-elastic behaviour could be also beneficial for bone distraction devices.…”

Section: Metallic Materialsmentioning

confidence: 99%

Biomaterials in orthopaedics

Navarro

Michiardi

Castaño

et al. 2008

J. R. Soc. Interface.

1,289

730

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At present, strong requirements in orthopaedics are still to be met, both in bone and joint substitution and in the repair and regeneration of bone defects. In this framework, tremendous advances in the biomaterials field have been made in the last 50 years where materials intended for biomedical purposes have evolved through three different generations, namely first generation (bioinert materials), second generation (bioactive and biodegradable materials) and third generation (materials designed to stimulate specific responses at the molecular level). In this review, the evolution of different metals, ceramics and polymers most commonly used in orthopaedic applications is discussed, as well as the different approaches used to fulfil the challenges faced by this medical field.

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“…These superior properties make NiTi alloys one of the most commercially successful shape memory alloys used for nonvascular and vascular stents in biomedical applications and for the fixation of damaged bone. [1,2,3] However, as an intermetallic compound, it is rather brittle and rare accidents have been reported of broken NiTi parts in the human body. Therefore, the fracture behavior is a subject to be investigated in order to improve this alloy.…”

Section: Introductionmentioning

confidence: 99%

Investigation on the fracture behavior of shape memory alloy NiTi

Chen

Wang

Sun

2005

Metall Mater Trans A

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This work investigates the fracture behavior of shape memory alloy NiTi (50.7 at. pct Ni) at room temperature. Macroscopic mechanical tests, microscopic in situ observations of tensile fracture processes by scanning electron microscopy (SEM), and detailed analyses of fracture surfaces were carried out. The results reveal that specimens with different thicknesses show various shape memory effects and superelasticities. The main crack with a quasi-cleavage mode that combines cleavage with ductile tearing is initiated at the notch tip and is stress-control-propagated in line with the direction of the maximum normal stress. The microstructure has little effect on the direction of crack propagation, but coarser substructures show lower resistance to the crack propagation. In specimens with various types of notches, various notch acuities present different effects on the crack initiation and propagation and result in different fracture behaviors.

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Medical Application of NiTi Shape Memory Alloy in China

Cited by 16 publications

References 0 publications

Titanium and Titanium Alloy Applications in Medicine

Titanium and Titanium Alloy Applications in Medicine

Biomaterials in orthopaedics

Investigation on the fracture behavior of shape memory alloy NiTi

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