An overview of nitinol medical applications

Duerig, T M; Pelton, Alan R.; Stöckel, D.

doi:10.1016/s0921-5093(99)00294-4

Cited by 1,448 publications

(806 citation statements)

References 12 publications

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“…Nowadays, shape memory alloys (SMA), and in particular nickel-titanium alloys (NiTi), are commonly used in biomedical applications (see among others [1][2][3][4][5][6][7]). The main attractive features of this class of materials are the capabilities of: (1) recovering the original shape after large deformations induced by mechanical load (pseudoelasticity) and (2) maintaining a deformed shape up to heat induced recovery of the original shape (shape memory effect).…”

Section: Introductionmentioning

confidence: 99%

Biomedical Applications of Shape Memory Alloys

Petrini

Migliavacca

2011

Journal of Metallurgy

456

200

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Shape memory alloys, and in particular NiTi alloys, are characterized by two unique behaviors, thermally or mechanically activated: the shape memory effect and pseudo-elastic effect. These behaviors, due to the peculiar crystallographic structure of the alloys, assure the recovery of the original shape even after large deformations and the maintenance of a constant applied force in correspondence of significant displacements. These properties, joined with good corrosion and bending resistance, biological and magnetic resonance compatibility, explain the large diffusion, in the last 20 years, of SMA in the production of biomedical devices, in particular for mini-invasive techniques. In this paper a detailed review of the main applications of NiTi alloys in dental, orthopedics, vascular, neurological, and surgical fields is presented. In particular for each device the main characteristics and the advantages of using SMA are discussed. Moreover, the paper underlines the opportunities and the room for new ideas able to enlarge the range of SMA applications. However, it is fundamental to remember that the complexity of the material and application requires a strict collaboration between clinicians, engineers, physicists and chemists for defining accurately the problem, finding the best solution in terms of device design and accordingly optimizing the NiTi alloy properties.

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Section: Introductionmentioning

confidence: 99%

Biomedical Applications of Shape Memory Alloys

Petrini

Migliavacca

2011

Journal of Metallurgy

456

200

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“…NITI shape memory alloys (SMAs) have been extensively applied in civil, [1][2][3] medical, [4][5][6][7][8] and aerospace [9][10][11] devices for their unique shape memory effect, pseudoelasticity, bio-compatibility, and corrosion resistance. [12][13][14][15][16][17][18] The characteristic transformation temperatures for the austenite-to-martensite phase transformation as well as the mechanical response can be modified to meet application requirements through (i) thermo-mechanical processing, [19][20][21] (ii) slight variation from the equi-atomic NiTi chemical composition, [22,23] or (iii) addition of alloying elements.…”

Section: Introductionmentioning

confidence: 99%

“…Depending on the thermo-mechanical processing, intermediate phase transformations may occur as well; one of the particular notes is the commonly observed R-phase transformation, which involves a slight distortion of the austenitic cubic B2 structure. [13] Precipitates, such as Ni 4 Ti 3 in austenitic (Ni-rich) NiTi alloys and Ti 2 Ni in martensitic (Ti-rich) NiTi alloys, play a significant role in the concentration of Ni in small localized regions, which change the phase transformation temperatures and mechanical properties. Although most dynamic investigations have been focused on austenitic NiTi alloys, [29][30][31][32][33][34][35][36][37][38][39] martensitic NiTi alloys also exhibit thermoelastic behavior and even better damping capacity, [40,41] due to the movement of twin interfaces.…”

Section: Introductionmentioning

confidence: 99%

Influence of Dynamic Compression on Phase Transformation of Martensitic NiTi Shape Memory Alloys

Qiu

Young

Nie

2015

Metall Mater Trans A

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Shape memory alloys (SMAs) exhibit high damping capacity in both austenitic and martensitic phases, due to either a stress-induced martensite phase transformation or a stress-induced martensite variant reorientation, making them ideal candidates for vibration suppression devices to protect structural components from damage due to external forces. In this study, both quasi-static and dynamic compression was conducted on a martensitic NiTi SMA using a mechanical loading frame and on a Kolsky compression bar, respectively, to examine the relationship between microstructure and phase transformation characteristics of martensitic NiTi SMAs. Both endothermic and exothermic peaks disappear completely after experiencing deformation at a strain rate of 10 3 s À1 and to a strain of about 10 pct. The phase transformation peaks reappear after the deformed specimens were annealed at 873 K (600°C) for 30 minutes. As compared to samples from quasi-static loading, where a large amount of twinning is observed with a small amount of grain distortion and fracture, samples from dynamic loading show much less twinning with a larger amount of grain distortion and fracture.

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“…Each of the two constitutive materials are well known for their typical behavior: NiTi exhibits superelasticity and shape memory behavior, and silicone rubber exhibits hyperelasticity allowing large deformations without permanent set. The use of NiTi was investigated for many applications during the last few years, especially in the medical field [4,5,6,7] due to its biocompatibility [8,9,10,11,12]. Also, similarly to SMA, elastomers are often considered to make composites [13,14].…”

Section: Introductionmentioning

confidence: 99%