The new multiscale finite element model of multilayer ventricular assist device

Magdalena Kopernik , Andrzej Milenin

AGH University of Science and Technology, 30 – 059 Kraków, Poland.

DOI:

https://doi.org/10.7494/cmms.2012.1.0381

Abstract:

Ventricular assist device is an artificial organ, which is used to treat heart diseases. In the world, as well as in Poland, efforts are made towards the development of such a device that is biocompatible, durable, low energy consuming, allows monitoring and does not introduce changes to the blood morphology. The review paper discusses the types of ventricular assist devices (VADs), including VADs proposed in Poland. The particular emphasis is put on the numerical modelling and computer aided design of such an artificial organ. The walls of the ventricular assist device are covered with a nanocoating of TiN using modern techniques (Pulsed Laser Deposition) to improve the biocompatibility. The nanocoating modifies the surface properties of the device. Mechanical properties of nanocoating are determined in experimental nanotests and using imaging techniques of nanostructures. However, these tests give average values of properties and this information is not sufficient for advanced design of ventricular assist devices. To eliminate this constraint, the multiscale modelling is applied. Developed solution, which is based on application and combination of methods such as finite element method, multiscale approach and inverse analysis, is presented in the paper. These methods are helpful in prediction the location of failure zones in the material of the ventricular assist device and then to analyze the local behaviour of nanocoating. Furthermore, it is possible to identify the parameters of the rheological model of nanocoating and introduce the residual stresses into models.

Cite as:

Kopernik, M., & Milenin, A. (2012). The new multiscale finite element model of multilayer ventricular assist device. Computer Methods in Materials Science, 12(1), 20 – 36. https://doi.org/10.7494/cmms.2012.1.0381

Article (PDF):

Keywords:

Ventricular assist device (VAD), Finite element method (FEM), Nanocoating, Titanium nitride (TiN), Representative

References: