The new multiscale finite element model of multilayer ventricular assist device

• Autorzy: Kopernik M. , Milenin A.

Warianty tytułu

PL

Nowy wieloskalowy model MES wielowarstwowej komory wspomagania pracy serca zbudowanej z poliuretanu i nanopo włoki TiN osadzonej metodą ablacji laserowej

• Języki publikacji: EN

Abstrakty

EN

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 designof 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 review 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.

PL

Komora wspomagania pracy serca jest sztucznym narządem, który jest wykorzystywany do leczenia chorób serca. Na świecie, jak i w Polsce, czynione są wysiłki zmierzające do opracowania takiego urządzenia, które jest biokompatybilne, trwałe, zużywa mało energii, pozwala na monitorowanie i nie wprowadza zamian w morfologii krwi. Niniejszy artykuł omawia rodzaje komór wspomagania pracy serca, łącznie z komorą wspomagania zaproponowaną w Polsce. Szczególnie nacisk jest położony na modelowanie numeryczne i komputerowe wspomaganie projektowania takiego sztucznego narządu. Ściany komory wspomagania pracy serca są pokryte nanopowłoką TiN za pomocą nowoczesnych technik (ablacja laserowa) w celu poprawy biokompatybilności. Nanopowłoką modyfikuje własności powierzchniowe takiego urządzenia. Własności mechaniczne nanopowłoki są określane w doświadczalnych nanotestach i za pomocą technik obrazowania nanostruktur. Jednakże, te testy podają średnie wartości własności i taka informacja nie jest wystarczająca dla zaawansowanego projektowania komory wspomagania pracy serca. Aby wyeliminować to ograniczenie, zastosowano modelowanie wieloskalowe. Opracowane rozwiązanie, które jest oparte na zastosowaniu i kombinacji metod takich jak: metoda elementów skończonych, podejście wieloskalowe i analiza odwrotna, zostało przedstawione w artykule. Te metody są pomocne przy przewidywaniu lokalizacji stref uszkodzenia w materiale komory wspomagania pracy serca i potem, aby analizować lokalne zachowanie nanopowłoki. Ponadto, jest możliwa identyfikacja parametrów modelu Teologicznego nanopowłoki i wprowadzenie naprężeń własnych do modeli.

Słowa kluczowe

EN

ventricular assist device (VAD); finite element method (FEM); nanocoating; titanium nitride (TiN); resentative volume element (RVE); polyurethane (PU); pulsed laser deposition (PLD)

• Wydawca: Wydawnictwa AGH
• Czasopismo: Computer Methods in Materials Science
• Rocznik: 2012
• Tom: Vol. 12, No. 1
• Strony: 20--36
• Opis fizyczny: Bibliogr. 54 poz., rys.

Twórcy

autor

Kopernik M.

autor

Milenin A.

• AGH University of Science and Technology, 30 - 059 Krakow, Poland,

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