Structural Design And Numerical Simulation Of An Implantable Axial Blood Pump: OAJBS Publishers
Structural Design And
Numerical Simulation Of An Implantable Axial Blood Pump by Huachun Wu* in Open
Access Journal of Biomedical Science (OAJBS)
The aim of this research is to design an
efficient implantable blood pump to support the blood circulation and reduce
the shear stress related blood damage. Axial blood pumps have been evidenced
and acknowledged in recent years because of their small size. In this study, an
axial blood pump which can be easily implanted in the human body has been
designed and studied. The computational fluid dynamics (CFD) analysis was
performed to improve the structural design and the fluid dynamics aspects of
the implantable axial blood pump. Based on established numerical methods and
hydrodynamic performance testing facilities, the distributions of flow
streamline, shear stress, velocity and pressure of the axial blood pump were
obtained using the commercial software (ANSYS Fluent, version 12.1.2). The relationship
between the rotational speed and shear stress was investigated at several
rotational speeds (5,000- 9,000rpm). Also, the pump characteristic curves of
the flow rate against the pressure head under different rotating speeds have
been performed. The results show that the implantable axial blood pump could
produce 5L/min of blood at 100mmHg through the outlet when rotating at about
6,570rpm; the rotational speed has a direct correlation with pressure drop and
shear stress; the scalar shear stresses were less than 360Pa. All of these
simulation findings are encouraging and demonstrate progress toward achieving
an implantable axial blood pump design. In comparison with existing models for
VADs, it is confirmed that the shear stresses are decreased by a little
increasing in the pump diameter. These will reduce the blood exposure to shear
stress significantly and consequently lower the blood damage.
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