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Related Experiment Videos

Characterization and optimization of the flow pattern inside a diaphragm blood pump based on flow visualization

M Nakata1, T Masuzawa, E Tatsumi

  • 1National Cardiovascular Center Research Institute, Osuita, Ibaraki University, Hitachi, Japan.

ASAIO Journal (American Society for Artificial Internal Organs : 1992)
|November 6, 1998
PubMed
Summary

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Optimizing blood pump flow patterns using laser light and paint erosion methods enhances antithrombogenicity. A consistent circular flow pattern at the blood chamber

Area of Science:

  • Biomedical Engineering
  • Fluid Dynamics
  • Cardiovascular Devices

Background:

  • Improving antithrombogenicity in artificial heart systems is crucial for patient outcomes.
  • Understanding internal blood flow dynamics within diaphragm blood pumps is essential for optimization.
  • Existing methods for assessing blood pump washout effects have limitations.

Purpose of the Study:

  • To investigate the relationship between internal flow patterns and washout effect in an electrohydraulic total artificial heart's diaphragm blood pump.
  • To determine optimal flow configurations for enhanced antithrombogenicity.
  • To evaluate the efficacy of combined flow visualization techniques for characterizing pump performance.

Main Methods:

  • Utilized laser light sheet visualization with polyethylene tracers to analyze main flow characteristics.

Related Experiment Videos

  • Employed a novel paint erosion method to quantify wall shear flow and estimate washout effect.
  • Systematically varied inflow and outflow valve orientations (17 patterns) to assess their impact on flow dynamics.

    • Main Results:

    • A single, consistent circular flow pattern observed via laser light sheet visualization correlated with a low paint residual ratio, indicating effective washout.
    • The optimal washout effect, characterized by the lowest paint residual ratio, occurred when the circular flow's center aligned with the blood chamber's geometric center.
    • Combined use of laser light sheet and paint erosion methods effectively characterized internal pump flow patterns.

    Conclusions:

    • Flow patterns within the diaphragm blood pump can be comprehensively characterized using a combination of laser light sheet and paint erosion techniques.
    • A distinct circular flow pattern is significant for achieving superior washout within the blood pump.
    • Optimizing flow patterns, particularly by establishing central circular flow, can enhance the antithrombogenicity of artificial heart systems.