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Related Experiment Videos

A tensor-based measure for estimating blood damage.

Dhruv Arora1, Marek Behr, Matteo Pasquali

  • 1Department of Mechanical Engineering and Materials Science, Rice University, Houston, TX, USA.

Artificial Organs
|October 27, 2004
PubMed
Summary
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Implantable ventricular assist devices face blood damage challenges. A new computational model shows rapidly fluctuating shear stress may reduce blood cell damage in continuous-flow pumps, offering design insights.

Area of Science:

  • Biomedical Engineering
  • Cardiovascular Devices
  • Fluid Dynamics

Background:

  • Implantable ventricular assist devices (VADs) are crucial for heart failure treatment.
  • Current VADs, especially continuous-flow pumps, face challenges with blood damage due to shear stress.
  • Traditional methods for assessing blood damage in VADs are limited.

Purpose of the Study:

  • To propose a novel tensor-based blood damage model for computational fluid dynamics (CFD) analysis.
  • To accurately predict blood cell damage in complex flow fields within VADs.
  • To inform the design of VADs with reduced hemoloysis.

Main Methods:

  • Developed a tensor-based blood damage model for CFD.
  • Modeled blood cells as deforming droplets.

Related Experiment Videos

  • Tracked cell deformation along computed flow pathlines.
  • Correlated model predictions with steady shear flow experimental data.

    • Main Results:

    • The model estimates time- and space-dependent strain on individual blood cells.
    • Blood cells in rapidly fluctuating shear flow can withstand high stress for short durations.
    • Significant deformation and hemolysis may be avoided in such conditions.

    Conclusions:

    • The proposed CFD model provides a more detailed assessment of blood damage.
    • Rapidly fluctuating shear flow in VADs might not cause significant blood cell damage.
    • This finding has implications for designing improved continuous-flow VADs, like the Gyro blood pump.