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Related Experiment Videos

Blood flow in a continuous flow ventricular assist device.

P E Allaire1, H G Wood, R S Awad

  • 1Mechanical, Aerospace and Nuclear Engineering Department, University of Virginia, Charlottesville 22903, USA.

Artificial Organs
|August 27, 1999
PubMed
Summary

Numerical analysis of the continuous flow ventricular assist device (CFVAD3) reveals pressure differential significantly impacts flow more than impeller rotation. Optimal speed is 2,200-2,400 rpm for efficient pumping.

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Area of Science:

  • Biomedical Engineering
  • Fluid Dynamics
  • Medical Device Design

Background:

  • Continuous flow ventricular assist devices (CFVADs) are crucial for managing heart failure.
  • Understanding the fluid dynamics within CFVADs is essential for optimizing their performance and patient outcomes.
  • The CFVAD3 is a specific model requiring detailed analysis of its operational parameters.

Purpose of the Study:

  • To numerically predict shear stresses, flow rates, and velocity profiles in the CFVAD3.
  • To investigate the influence of rotational speed, pressure gradients, and clearances on CFVAD3 performance.
  • To determine optimal operating parameters for the CFVAD3.

Main Methods:

  • A numerical analysis was conducted using FLOW3D software.

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  • The CFVAD3 was modeled as a rotating disk over a stationary disk.
  • Various clearances, rotational speeds, and pressure gradients were simulated.

    • Main Results:

    • The pressure differential was found to have a greater effect on flow than the impeller's Ekman layer rotation.
    • Predicted shear stresses correlated with observed changes in volume flow rates and velocity profiles.
    • Velocity fields were successfully generated, illustrating flow characteristics.

    Conclusions:

    • The pressure differential is the dominant factor influencing flow in the CFVAD3.
    • An optimal operating speed for the CFVAD3 is between 2,200 and 2,400 rpm.
    • The choice of speed within this range depends on the specific pump efficiency requirements.