Nitinol stent design – understanding axial buckling

McGrath, Donnacha J.; O’Brien, Barry; Bruzzi, Mark; McHugh, Peter E.

doi:10.1016/j.jmbbm.2014.08.029

Cited by 36 publications

(21 citation statements)

References 29 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…9. Similar simulated bench testing may be found in [22] and [35] applied to balloon expandable coronary stents, and in [23] to self-expanding tracheobronchial stents.…”

Section: Virtual Radial Compression-expansion Testsupporting

confidence: 55%

See 1 more Smart Citation

A methodology for the customized design of colonic stents based on a parametric model

Puértolas

Navallas

Herrera

et al. 2017

Journal of the Mechanical Behavior of Biomedical Materials

View full text Add to dashboard Cite

The choice of necessary stent properties depends mainly on the length of the stenosis and degree of occlusion. So a stent design with variable radial stiffness along its longitudinal axis would be a good option. The design proposed corresponds to a tube-based stent with closed diamond-shaped cells made from a NiTi alloy. By acting independently on different geometric factors, variable geometries can be obtained with different radial force reactions. A design adjustment according to specific requirements, in order to get a better fit to ill-duct and reduces complications, is possible. A parametric analysis using finite element has been conducted to determine the influence of slot length, number of circumferential slots, tube thickness and shape-factor on stent mechanical behavior, which allow eliminating the need for extensive experimental work and knowing and quantifying the influence of those factors. The results of finite element simulations have been used, by means of least-squares fit techniques, to obtain analytical expressions for the main mechanical characteristics of the stent (Chronic Expansive Radial Force and Radial Compression Resistance) in terms of the different geometrical factors. This allows the stent geometry to be customized without launching an iterative and costly process of modeling and simulation for each case.

show abstract

“…9. Similar simulated bench testing may be found in [22] and [35] applied to balloon expandable coronary stents, and in [23] to self-expanding tracheobronchial stents.…”

Section: Virtual Radial Compression-expansion Testsupporting

confidence: 55%

“…Finite element analysis is commonly used in contrasting the main mechanical parameters (radial and axial strength, flexibility, etc.) of different stents [22][23][24][25][26].…”

Section: Introductionmentioning

confidence: 99%

A methodology for the customized design of colonic stents based on a parametric model

Puértolas

Navallas

Herrera

et al. 2017

Journal of the Mechanical Behavior of Biomedical Materials

View full text Add to dashboard Cite

show abstract

“…Since our analysis was carried out in cylindrical coordinate system( r , θ , z ) where, rotational DOF were constrained on the stent as a whole unit to allow only a radially inward deformation, mimicking stent crimping. For all our simulations, contact between the pipe and the stent was modelled with frictionless tangential and hard normal contact . The contact algorithm applied the master surface priority to the inner surface of the crimper while the stent outer surface was set as the slave surface.…”

Section: Methodsmentioning

confidence: 99%

“…For all our simulations, contact between the pipe and the stent was modelled with frictionless tangential and hard normal contact. 43,48 The contact algorithm applied the master surface priority to the inner surface of the crimper while the stent outer surface was set as the slave surface. A penalty interaction property was used to enforce impermeable boundaries.…”

Section: Finite Element Analysismentioning

confidence: 99%

Feasibility of using bulk metallic glass for self-expandable stent applications

Kumar

Jafary-Zadeh

Tavakoli

et al. 2016

J. Biomed. Mater. Res.

View full text Add to dashboard Cite

Self-expandable stents are widely used to restore blood flow in a diseased artery segment by keeping the artery open after angioplasty. Despite the prevalent use of conventional crystalline metallic alloys, for example, nitinol, to construct self-expandable stents, new biomaterials such as bulk metallic glasses (BMGs) are being actively pursued to improve stent performance. Here, we conducted a series of analyses including finite element analysis and molecular dynamics simulations to investigate the feasibility of using a prototypical Zr-based BMG for self-expandable stent applications. We model stent crimping of several designs for different percutaneous applications. Our results indicate that BMG-based stents with diamond-shaped crowns suffer from severe localization of plastic deformation and abrupt failure during crimping. As a possible solution, we further illustrate that such abrupt failure could be avoided in BMG-based stents without diamond shape crowns. This work would open a new horizon for a quest toward exploiting superior mechanical and functional properties of metallic glasses to design future stents. © 2016 Wiley Periodicals, Inc. J Biomed Mater Res Part B: Appl Biomater, 105B: 1874-1882, 2017.

show abstract

“…Other biomedical applications of nitinol include blood clot filters and stents in cardiovascular treatments. These alloys change their shape upon phase transformation and so they can be used as blood clot filters and as stents in cardiovascular treatments [49][50][51].…”

Section: Applications Of Nitinol In Stentmentioning

confidence: 99%

Brief Overview on Nitinol as Biomaterial

Wadood

2016

Advances in Materials Science and Engineering

111

View full text Add to dashboard Cite

Shape memory alloys remember their shape due to thermoelastic martensitic phase transformation. These alloys have advantages in terms of large recoverable strain and these alloys can exert continuous force during use. Equiatomic NiTi, also known as nitinol, has a great potential for use as a biomaterial as compared to other conventional materials due to its shape memory and superelastic properties. In this paper, an overview of recent research and development related to NiTi based shape memory alloys is presented. Applications and uses of NiTi based shape memory alloys as biomaterials are discussed. Biocompatibility issues of nitinol and researchers’ approach to overcome this problem are also briefly discussed.

show abstract

Nitinol stent design – understanding axial buckling

Cited by 36 publications

References 29 publications

A methodology for the customized design of colonic stents based on a parametric model

A methodology for the customized design of colonic stents based on a parametric model

Feasibility of using bulk metallic glass for self-expandable stent applications

Brief Overview on Nitinol as Biomaterial

Contact Info

Product

Resources

About