Numerical Study on the Effect of Miniaturized Impeller Diameter on Mechanical Performance in a Left Ventricular Assist Device

Authors

  • Muhammad Rashidi Abdul Kadir School of Mechanical Engineering, Faculty of Engineering, Universiti Teknologi Malaysia, 81310 Skudai, Johor, Malaysia
  • Mugabe Jean Paul Ministry of Health, Rwandan Government, Rwanda
  • Mohamad Ikhwan Kori School of Biomedical Engineering and Health Sciences, Faculty of Engineering, Universiti Teknologi Malaysia, 81310 Skudai, Johor, Malaysia
  • Kahar Osman IJN-UTM Cardiovascular Engineering Centre, Institute of Human Centered Engineering, Universiti Teknologi Malaysia, 81310 Skudai, Johor, Malaysia
  • Aizai Azan Abdul Rahim Institut Jantung Negara, Kuala Lumpur, 54100, Malaysia
  • Ahmad Zahran Md Khudzari IJN-UTM Cardiovascular Engineering Centre, Institute of Human Centered Engineering, Universiti Teknologi Malaysia, 81310 Skudai, Johor, Malaysia

DOI:

https://doi.org/10.37934/araset.28.2.2633

Keywords:

Computational Fluid Dynamics, Left Ventricular Assist Device, Miniaturized

Abstract

Heart failure continues to be a major global health problem causing significant health issues and deaths. Left Ventricular Assist Device (LVAD) was developed as an alternative to heart transplant to support the patients with severe end stage heart failure. Despite the current advancement of LVAD, constant improvements are always being made in making it smaller LVADs tailored for patients with smaller physiology while still maintaining the flow ventricular pump capability to the body. This study evaluated the effect of using a smaller sized LVAD using Computation Fluid Dynamics (CFD) and compared with the initial pump size at their respective designed rotating speed. Two model variants were studied, the initial design with 44.8mm diameter impeller (2000 rpm rotating speed) and the smaller 37.0 mm diameter impeller (2500 rpm rotating speed). These designs were compared by their key criteria mechanical performances particularly the produced pressure difference along a range of flowrate and the efficiency curve. At the required flowrate of 5 L/min, the smaller sized 37.0 mm impeller was able to deliver the flowrate at a slightly higher pressure difference of 114.60 mmHg as compared to the 44.8 mm impeller at 106.01 mmHg. In overall, both model variant produced similar pressure-flowrate curve with the 37.0 mm impeller performing marginally better at higher flowrates. Efficiency was able to be maintained at 49-60 percent despite being a smaller impeller at a faster rotating speed. Miniaturizing the LVAD has been numerically demonstrated to be feasible to produce the needed flow output at the required pressure difference without affect efficiency significantly . 

Author Biography

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

zahran@biomedical.utm.my

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Published

2022-10-17

How to Cite

Muhammad Rashidi Abdul Kadir, Mugabe Jean Paul, Mohamad Ikhwan Kori, Kahar Osman, Aizai Azan Abdul Rahim, & Md Khudzari, A. Z. (2022). Numerical Study on the Effect of Miniaturized Impeller Diameter on Mechanical Performance in a Left Ventricular Assist Device. Journal of Advanced Research in Applied Sciences and Engineering Technology, 28(2), 26–33. https://doi.org/10.37934/araset.28.2.2633

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