Numerical Study of a Left Ventricular Assist Device (LVAD) With Different Blade Heights and Tip Clearances

  • Muhammad Rashidi Abdul Kadir Faculty of Biosciences & Medical Engineering, Universiti Teknologi Malaysia
  • Mohammad Azim Abdul Aziz Faculty of Biosciences & Medical Engineering, Universiti Teknologi Malaysia
  • Mohammad Hasbullah Padzillah Faculty of Mechanical Engineering, Universiti Teknologi Malaysia, 81310 Skudai, Johor, Malaysia UTM-Centre for Low Carbon Transport (Locartic), Institute of Vehicle System and Engineering, Universiti Teknologi Malaysia, 81310 Skudai, Johor, Malaysia
  • Mohamad Nor Harun Faculty of Mechanical Engineering, Universiti Teknologi Malaysia, 81310 Skudai, Johor, Malaysia Sports Innovation Technology Centre, Institute of Human Centered Engineering, Universiti Teknologi Malaysia, 81310 Skudai, Johor, Malaysia
  • Kahar Osman Faculty of Biosciences and Medical Engineering, Universiti Teknologi Malaysia, 81310 Skudai, Johor, Malaysia IJN-UTM Cardiovascular Engineering Centre, Institute of Human Centered Engineering, Universiti Teknologi Malaysia, 81310 Skudai, Johor, Malaysia
  • Aizai Azan Abdul Rahim Institut Jantung Negara, 50400, Kuala Lumpur
  • Mohamed Ezani Abdul Taib Institut Jantung Negara, 50400, Kuala Lumpur
  • Ahmad Zahran Md Khudzari Faculty of Biosciences and Medical Engineering, Universiti Teknologi Malaysia, 81310 Skudai, Johor, Malaysia IJN-UTM Cardiovascular Engineering Centre, Institute of Human Centered Engineering, Universiti Teknologi Malaysia, 81310 Skudai, Johor, Malaysia
Keywords: Left Ventricular Assist Device, Blade height, Blade tip clearance, Haemolysis.

Abstract

One treatment modality for heart failure is to employ a mechanical heart assist device to increase blood flow to peripheral organs. There are various kinds of axial and centrifugal type mechanical pumps available for implantation depending on patient condition. Axial pumps are smaller in size comparatively, although centrifugal pumps have the advantages of lower rotational speed as well as better maintaining any native blood flow pulsatility. This work presents the results of the numerical study of the centrifugal blood pump configured as a Left Ventricular Assist Device (LVAD). The pump design utilized standard industrial centrifugal pump design principles but applied to smaller sized blood pumps. Flow characteristics are modelled using 3-dimensional steady state models operating at design speed of 2000 rpm using Newtonian blood properties for the fluid. Two design parameters of the pump are studied, the impeller blade height and tip clearance resulting in nine model variants. Analysis includes the hydrodynamic performance of the pump and the flow characteristics in the pump. A haemolysis prediction model quantifying red blood cell stress from exposure time and shear stress was used for quantitative predictions of haemolysis within the blood pump. Blood damage estimation was calculated along each path-line and averaged to a single value. By using a ranked selection method, the model with the 15 mm blade height and 800 µm tip clearance was selected as the preferred configuration with Haemolysis Index of 0.01 mmHg, efficiency of 58% at 104 mmHg outlet pressure.

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Author Biography

Ahmad Zahran Md Khudzari, Faculty of Biosciences and Medical Engineering, Universiti Teknologi Malaysia, 81310 Skudai, Johor, Malaysia IJN-UTM Cardiovascular Engineering Centre, Institute of Human Centered Engineering, Universiti Teknologi Malaysia, 81310 Skudai, Johor, Malaysia

Director,

IJN-UTM Cardiovascular Engineering Centre, Institute of Human Centered Engineering, UTM

Senior Lecturer,

Clinical Science Department, Faculty of Biosciences & Medical Engineering, Universiti Teknologi Malaysia

Published
03-09-2018
How to Cite
Abdul Kadir, M. R., Abdul Aziz, M. A., Padzillah, M. H., Harun, M. N., Osman, K., Abdul Rahim, A. A., Abdul Taib, M. E., & Md Khudzari, A. Z. (2018). Numerical Study of a Left Ventricular Assist Device (LVAD) With Different Blade Heights and Tip Clearances. International Journal of Integrated Engineering, 10(4). Retrieved from https://publisher.uthm.edu.my/ojs/index.php/ijie/article/view/2300
Section
Articles