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The Baylor total artificial heart. Flow visualization studies

Y Orime1, S Takatani, K Tasai

  • 1Department of Surgery, Baylor College of Medicine, Houston, Texas 77030, USA.

ASAIO Journal (American Society for Artificial Internal Organs : 1992)
|July 1, 1994
PubMed
Summary
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Modifying the Baylor total artificial heart (TAH) inflow valve angle improved leaflet closure and reduced vortex formation. This enhancement optimized flow patterns and washout within the pumping chamber for better TAH performance.

Area of Science:

  • Biomedical Engineering
  • Cardiovascular Devices
  • Fluid Dynamics

Background:

  • Total artificial hearts (TAHs) are crucial for end-stage heart failure.
  • Optimizing TAH hemodynamics is essential to prevent complications like thrombus formation.
  • Understanding inflow valve dynamics is key to improving TAH function.

Purpose of the Study:

  • To analyze left-sided Baylor TAH flow patterns.
  • To evaluate the impact of inflow valve angle on flow dynamics.
  • To identify design modifications for improved TAH performance.

Main Methods:

  • Flow visualization studies using laser light on transparent TAH models.
  • Segmental scanning of housing to record flow patterns and velocities.
  • Comparison of modified (20-degree inflow valve angle) and unmodified TAH models.

Related Experiment Videos

  • Synchronization of camera shutter with pusher-plate movement for accurate data capture.

    • Main Results:

    • Modified inflow valve angle demonstrated improved leaflet closure characteristics.
    • Reduced vortex formation at the inflow port, mitigating thrombus formation risk.
    • Enhanced washout throughout the pumping chamber during the diastolic phase.
    • Validated global flow patterns and local flow velocities.

    Conclusions:

    • A 20-degree modification to the Baylor TAH inflow valve angle significantly improves hemodynamic performance.
    • The study presents a simple, inexpensive flow visualization technique applicable to various blood pumps.
    • Optimized flow patterns can lead to reduced complications and improved patient outcomes with TAHs.