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Numerical modelling and verification of Polish ventricular assist device

Milenin A., Kopernik M., Jurkojć D., Gawlikowski M., Rusin T., Darłak M., Kustosz R.

Acta of Bioengineering and Biomechanics

2012

Vol. 14, no. 3

49-57

The developed multiscale model of blood chamber of POLVAD (Polish ventricular assist device) was introduced. The tension test for polymer and digital image correlation (DIC) were performed for verification of the strains and displacements obtained in the numerical model of POLVAD_EXT. The numerical simulations were carried out in conditions given in the experiment to compare the results obtained on external surfaces of blood chamber of the POLVAD_EXT. The examined polymer applied in the POLVADs is sensitive to changes of temperature and this observation is considered in all prepared numerical models. The comparison of experimental and numerical results shows acceptable coincidence. There are some heterogeneous distributions of strains in experiment with respect to analysis of computed parameters. The comparison of two versions of blood chambers (POLVAD and POLVAD_EXT) in numerical analysis shows that POLVAD_EXT construction is better with respect to analysis of strain and stress. The maximum values of computed parameters are located in the regions between connectors on the internal surfaces of blood chambers of POLVAD.

Microscale analysis of strain-stress state for TiN nanocoating of POLVAD and POLVAD_EXT

Milenin A., Kopernik M.

Acta of Bioengineering and Biomechanics

2011

Vol. 13, no. 4

11-19

The main purpose of the research was to develop the micromodel of biocompatible titanium nitride nanocoating deposited on polymer by pulsed laser deposition method in blood chambers of Polish ventricular assist devices: POLVAD and POLVAD_EXT. The analysis of the parameters of micromodel crucial for the phenomenon of loss of cohesion occurring between coating and substrate was carried out as well. The micromodel takes into account residual stress, material model of nanocoating, stress resulting from blood pressure in chamber, the thickness of coating and wave parameters of nanocoating (wavelength and antinode). The investigation shows that thickness and residual stress are the most influential parameters. The phenomenon of the loss of cohesion will be observed more frequently for thicker coatings with higher residual stresses.