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Proposal of hemodynamically improved design of an axial flow blood pump for LVAD

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Abstract

Left ventricular assist devices (LVAD) emerges as an effective clinical device providing life-saving support to heart patients. The design of blood pump of an LVAD involves incredible accuracy and thorough understanding of hemodynamics to mimic the functionality of a healthy ventricle. This work studies hemodynamics around an LVAD and proposes an improved model of axial blood pump for cardiac circulation without any hemolysis complications through numerical investigations. A three-dimensional study on different versions of the impeller with three curved blades (pump I) and spiral blade (pump II) is carried out by utilizing computational fluid dynamics software ANSYS-CFX at a range of rotational speeds and flow rates. The non-Newtonian blood flow through pump is modeled by using Bird-Carreau model. To capture the change in the flow field near the rotating blade, a transient blade row model was employed. The proposal of spiral blade impeller was found to be more compatible as per the hemolytic performance. It considerably reduces the blood damage to two times lesser value than that by pump I and also improves the quality blood flow field. The spiral blade provides a guiding path to the blood particle and avoids mixing of different bloodstreams, thus reducing the eddy losses.

The graphical abstract shows the performance enhancement of the axial blood pump. The model proposed by Peng et al. (Comput Methods Biomech Biomed Engin 17(7):723–727, 2014) has been upgraded to two new versions by redesigning its impeller. Proposed design (pump II) shows improvement in pressure distribution (a) and reduction in hemolysis (in the case of pump II) index (b).

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Funding

This research work was supported by the Ministry of Human Resource Development (MHRD) and Indian Council of Medical Research (ICMR) under the IMPRINT scheme (award number 3-18/2015-TSI).

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Authors and Affiliations

  1. Mechanical and Industrial Engineering Department, IIT Roorkee, Roorkee, Uttarakhand, 247667, India

    Vikas Kannojiya & Arup Kumar Das

  2. Department of Mechanical Engineering, IIT Kharagpur, Kharagpur, West Bengal, India

    Prasanta Kumar Das

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  1. Vikas Kannojiya
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  2. Arup Kumar Das
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Correspondence to Arup Kumar Das.

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Kannojiya, V., Das, A.K. & Das, P.K. Proposal of hemodynamically improved design of an axial flow blood pump for LVAD. Med Biol Eng Comput 58, 401–418 (2020). https://doi.org/10.1007/s11517-019-02097-5

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  • DOI: https://doi.org/10.1007/s11517-019-02097-5

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