Computational studies of shape memory alloy behavior in biomedical applications.

BACKGROUND Nowadays, shape memory alloys (SMAs) and in particular Ni-Ti alloys are commonly used in bioengineering applications as they join important qualities as resistance to corrosion, biocompatibility, fatigue resistance, MR compatibility, kink resistance with two unique thermo-mechanical behaviors: the shape memory effect and the pseudoelastic effect. They allow Ni-Ti devices to undergo large mechanically induced deformations and then to recover the original shape by thermal loading or simply by mechanical unloading. METHOD OF APPROACH A numerical model is developed to catch the most significant SMA macroscopic thermo-mechanical properties and is implemented into a commercial finite element code to simulate the behavior of biomedical devices. RESULTS The comparison between experimental and numerical response of an intravascular coronary stent allows to verify the model suitability to describe pseudo-elasticity. The numerical study of a spinal vertebrae spacer where the effects of different geometries and material characteristic temperatures are investigated, allows to verify the model suitability to describe shape memory effect. CONCLUSION the results presented show the importance of computational studies in designing and optimizing new biomedical devices.

[1]  M. Tabrizian,et al.  Nitinol versus stainless steel stents: acute thrombogenicity study in an ex vivo porcine model. , 2002, Biomaterials.

[2]  J. Ryhänen.  Biocompatibility evaluation of nickel-titanium shape memory metal alloy , 1999 .

[3]  Christian Miehe,et al.  A multi-variant martensitic phase transformation model: formulation and numerical implementation , 2001 .

[4]  Christian Licht,et al.  Thermomechanical couplings and pseudoelasticity of shape memory alloys , 1998 .

[5]  B. Ransil,et al.  Comparative evaluation of clinically available inferior vena cava filters with an in vitro physiologic simulation of the vena cava. , 1993, Radiology.

[6]  F. Auricchio,et al.  Stainless and shape memory alloy coronary stents: a computational study on the interaction with the vascular wall , 2004, Biomechanics and modeling in mechanobiology.

[7]  T. W. Duerig,et al.  Engineering Aspects of Shape Memory Alloys , 1990 .

[8]  K P Walsh,et al.  The Amplatzer septal occluder , 2000, Cardiology in the Young.

[9]  E. Sacco,et al.  Thermo-mechanical modelling of a superelastic shape-memory wire under cyclic stretching–bending loadings , 2001 .

[10]  K. Johnston,et al.  In vitro hemodynamic evaluation of a Simon nitinol vena cava filter: possible explanation of IVC occlusion. , 2001, Journal of vascular and interventional radiology : JVIR.

[11]  Y. Han,et al.  Creation of an intra‐atrial communication with a new Amplatzer shunt prosthesis: Preliminary results in a swine model , 2002, Catheterization and cardiovascular interventions : official journal of the Society for Cardiac Angiography & Interventions.

[12]  C. M. Wayman.  Shape memory and related phenomena , 1992 .

[13]  C. Barras,et al.  Nitinol - its use in vascular surgery and other applications. , 2000, European journal of vascular and endovascular surgery : the official journal of the European Society for Vascular Surgery.

[14]  Shanglian Huang,et al.  A comprehensive description for shape memory alloys with a two-phase constitutive model , 2001 .

[15]  F. Auricchio,et al.  A three‐dimensional model describing stress‐temperature induced solid phase transformations: solution algorithm and boundary value problems , 2004 .

[16]  D. Lagoudas,et al.  Numerical implementation of a shape memory alloy thermomechanical constitutive model using return mapping algorithms , 2000 .

[17]  R. Virmani,et al.  Progressive vascular remodeling and reduced neointimal formation after placement of a thermoelastic self-expanding nitinol stent in an experimental model. , 1998, Catheterization and cardiovascular diagnosis.

[18]  Ferdinando Auricchio,et al.  Shape-memory alloys: macromodelling and numerical simulations of the superelastic behavior , 1997 .

[19]  K. M. Liew,et al.  Multi-dimensional superelastic behavior of shape memory alloys via nonlinear finite element method , 2002 .

[20]  R. Clayman,et al.  Hydrophilic guide wire technique to facilitate organ entrapment using a laparoscopic sack during laparoscopy. , 2002, The Journal of urology.

[21]  C. M. Wayman,et al.  Shape-Memory Materials , 2018 .

[22]  G. Tytgat,et al.  Results of the New Nitinol Self-Expandable Stents for Distal Biliary Strictures , 1995, Endoscopy.

[23]  Saibal Mukhopadhyay,et al.  Self- and balloon-expandable stent implantation for severe native coarctation of aorta in adults. , 2003, American heart journal.

[24]  E. Stein,et al.  Elastoplastic materials with martensitic phase transition and twinning at finite strains: Numerical solution with the finite element method , 1999 .

[25]  R B Ashman,et al.  A Preliminary Investigation of Shape Memory Alloys in the Surgical Correction of Scoliosis , 1993, Spine.

[26]  R. Clayman.  Nitinol stone retrieval-assisted ureteroscopic management of lower pole renal calculi. , 2002, The Journal of urology.

[27]  H. Uehata,et al.  Initial and 6-month results of biodegradable poly-l-lactic acid coronary stents in humans. , 2000, Circulation.

[28]  L. Schetky.  Shape-memory alloys , 1979 .

[29]  K. Dai,et al.  Treatment of intra-articular fractures with shape memory compression staples. , 1993, Injury.

[30]  L. Yahia,et al.  Preliminary investigation of the effects of surface treatments on biological response to shape memory NiTi stents. , 1999, Journal of biomedical materials research.

[31]  Dimitris C. Lagoudas,et al.  On thermomechanics and transformation surfaces of polycrystalline NiTi shape memory alloy material , 2000 .

[32]  P. Y. Manach,et al.  Shear and tensile thermomechanical behavior of near equiatomic NiTi alloy , 1997 .

[33]  J. Ryhänen,et al.  Stabilization of acute, complete acromioclavicular joint dislocations with a new C hook implant. , 2003, Journal of shoulder and elbow surgery.

[34]  R. Langer,et al.  Biodegradable, Elastic Shape-Memory Polymers for Potential Biomedical Applications , 2002, Science.

[35]  B. Katzen,et al.  In vitro evaluation of a retrievable low-profile nitinol vena cava filter. , 2003, Journal of vascular and interventional radiology : JVIR.

[36]  E. N. Mamiya,et al.  Three-dimensional model for solids undergoing stress-induced phase transformations , 1998 .

[37]  A. Nachemson.  The Load on Lumbar Disks in Different Positions of the Body , 1966, Clinical orthopaedics and related research.

[38]  A. Veldhuizen,et al.  Scoliosis correction with shape-memory metal: results of an experimental study , 2002, European Spine Journal.

[39]  M. Wagner,et al.  Development of a polymer stent with shape memory effect as a drug delivery system , 2003, Journal of materials science. Materials in medicine.

[40]  Ho-Young Song,et al.  Use of a newly designed multifunctional coil catheter for stent placement in the upper gastrointestinal tract. , 2004, Journal of vascular and interventional radiology : JVIR.

[41]  Etienne Patoor,et al.  Micromechanical Modelling of Superelasticity in Shape Memory Alloys , 1996 .