The potential of biocompatible metallic stents and preventing restenosis

Kathuria, Y.P.

doi:10.1016/j.msea.2005.11.007

Cited by 46 publications

(39 citation statements)

References 20 publications

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“…The EDM surface corrosion resistance has encountered little interest [19][20][21][22][23] despite of its importance for many applications of metallic components manufactured by this process and used in more or less aggressive environments typically in aerospace, nuclear power plant and biomedical dental implant industries [1][2][3][24][25][26][27][28]. Furthermore, the available data on the corrosion resistance of finished surface by EDM is incomplete and sometimes controversial to provide any meaningful conclusion.…”

Section: Introductionmentioning

confidence: 99%

“…Kathuria et al [28] reveal, on the basis of accumulation of wear debris around the implant, the existence of real risks of emission of toxic elements in the human body in the form of Cr 6+ , Mo 6+ , Fe 3+ , Co 2+ and Ni 2+ ions, by corrosion in vitro physiological fluid of AISI316L SS used for fabrication of expansion cardiovascular stents by micro EDM or by laser beam. This suggests the need of understanding and assessment of the white layer role on the localised corrosion resistance of AISI316L SS, proposed by this study.…”

Section: Introductionmentioning

confidence: 99%

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Effect of electro discharge machining (EDM) on the AISI316L SS white layer microstructure and corrosion resistance

Sidhom

Ghanem

Amadou

et al. 2012

Int J Adv Manuf Technol

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is an open access repository that collects the work of Arts et Métiers ParisTech researchers and makes it freely available over the web where possible. Abstract The localised corrosion resistance of austenitic stainless steels is strongly influenced by the quality of finished surface. EDM machining induces substantial changes by the high thermal gradients generated by electric sparks. Experimental techniques such as roughness measurement, scanning electron microscopy (SEM), energy dispersive microanalysis (EDX) and X-ray diffraction technique, reveal microgeometrical, microstructural, chemical and mechanical changes. These changes lead to white and heat-affected layers with a depth less than 100 μm. The white layer is a melted material characterised by dendritic structure and constituted by austenite, chromium carbide and ε-carbide. The heat-affected layer is characterised by very large grain size comparatively to the bulk material. Electrochemical test coupled with metallographic examinations using SEM reveals a weakening of the resistance to pitting and intergranular corrosion comparatively to diamond polished surface. This weakening is correlated to differences in structure and chemical composition of white layer. Susceptibility to stress corrosion cracking has been attributed to the field of tensile residual stresses resulting from thermal effects. The removal of the white layer material by polishing or wire brushing restores the corrosion resistance of the AISI316L SS.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect of electro discharge machining (EDM) on the AISI316L SS white layer microstructure and corrosion resistance

Sidhom

Ghanem

Amadou

et al. 2012

Int J Adv Manuf Technol

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“…Computer aided tools were used to evaluate the stent material's performance and to predict the stent's long-term fatigue life. Three steps are taken into account for designing a (1167) better stent implant, that satises the material requirements in this research: (1) a fatigue test environment is developed and a fatigue testing for a stent is realized in laboratory environment, (2) distribution of Von Mises stress [5] and maximum values, for simulation of the stent material fatigue, were investigated by FEA model, developed to compare stress-strain of nitinol stent, (3) metal fatigue quantitative study of the Goodman diagram, recommended by the FDA for stent analysis [6,7]. Equation of the Goodman diagram is given in the text below to quantify the interaction of mean and alternating stresses on the fatigue life of a material.…”

Section: Methodsmentioning

confidence: 99%

“…1. The maximum strain recovery after plastic deformation is 8.5% [5]. The applied radial and outward forces of expanding stent wire and the interaction with the blood vessel are depicted in Fig.…”

Section: Introductionmentioning

confidence: 99%

A Research on Nitinol Alloy Material Fatigue Behavior Analysis of Cardiovascular Stent in Medical Engineering

Karaçalı¹

2015

Acta Phys. Pol. A

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Biocompatible cardiovascular stents are small cylindrical support structures introduced into the stenosed arteries to reopen the lumen and to restore blood ow in treating heart disease, which have revolutionized interventional cardiology. Cardiovascular stent designers are confronted with two basic requirements, such as an innite life and the thinnest wires. Pulsatile pressure, repetitive mechanical forces, within the coronary artery may result in stent fatigue and fracture after stent implantation, particularly in patients with complex coronary disease. This research describes the simulation analysis of cardiovascular stents, to provide designers with estimates of their in vivo structural behavior and fatigue properties. Stent material failure or device fatigue remains major concern for stent manufactures and researchers. The objective of this research was to simulate the mechanical behavior of the stent using nite element method. A nite element analysis (FEA) of cardiovascular stent under fatigue cyclic loading conditions is presented. Commercial software was employed to study the fatigue performance of nitinol alloy materials in new stent systems. The eects of deployment, and static cyclic pressure loading on cardiovascular stent fatigue life were simulated and analyzed for nitinol alloy material. The investigation results displayed a signicant correlation between material combinations, stent loading, and fatigue behavior.

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“…Among the treatments available, the ion implantation technique is one of the commonly used to improve wear and corrosion resistance of stents. For example, is proved that N+ ion implantation with 1016 ions/cm 2 improve the corrosion resistance of stainless steel [40]. Another treatment currently used in surface modifications is electropolishing, where the wire surface is oxidized by a single of a mixed acidic electrolyte [41].…”

Section: Stainless Steelmentioning

confidence: 99%

Mechanical properties of stent–graft materials

Santos

Rodrigues

Figueiredo³

et al. 2012

Proceedings of the Institution of Mechanical Engineers, Part L:

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An aneurysm is a localized blood-filled dilatation of an artery whose consequences can be deadly. One of its current treatments is endovascular aneurysm repair (EVAR), a minimally invasive procedure in which an endoprosthesis, called a stentgraft, is placed transluminally to prevent wall rupture. 2Early stent-grafts were custom designed for the patient through the assembling of off-the-shelf components by the operating surgeon. However, nowadays, stentgrafts have become a commercial product. The existing endoprostheses differ in several aspects, such as shape design and materials, but they have in common a metallic scaffold with a polymeric covering membrane. This paper aims to gather relevant information for those who wish to understand the principles of stent-grafts and even to develop new devices. Hence, a stent-graft classification based on different characteristics is presented, and the significant features of an ideal device are pointed out. Additionally, the materials currently in use to fabricate this type of prosthesis are reviewed and new materials are suggested.

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The potential of biocompatible metallic stents and preventing restenosis

Cited by 46 publications

References 20 publications

Effect of electro discharge machining (EDM) on the AISI316L SS white layer microstructure and corrosion resistance

Effect of electro discharge machining (EDM) on the AISI316L SS white layer microstructure and corrosion resistance

A Research on Nitinol Alloy Material Fatigue Behavior Analysis of Cardiovascular Stent in Medical Engineering

Mechanical properties of stent–graft materials

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