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Total Artificial Heart Computational Fluid Dynamics: Modeling of Stator Bore Design Effects on Journal-Bearing

Maryam Khelghatibana1, Mark S Goodin2, Michael Yaksh3

  • 1From the SimuTech Group, Montreal, Quebec, Canada.

ASAIO Journal (American Society for Artificial Internal Organs : 1992)
|August 12, 2021
PubMed

Insights

Optimizing the stator-bearing bore radius in the Cleveland Clinic's continuous-flow total artificial heart (CFTAH) reduces rotor power and blood residence time while increasing flow. This enhances hydraulic performance for improved artificial heart function.

Area of Science:

  • Biomedical Engineering
  • Fluid Dynamics
  • Medical Devices

Background:

  • The Cleveland Clinic continuous-flow total artificial heart (CFTAH) utilizes magnetic and hydrodynamic forces for rotor suspension.
  • The journal-bearing blood passage is critical for hydraulic performance and requires optimization.

Purpose of the Study:

  • To investigate the effect of stator-bearing bore radius on the journal-bearing hydraulic performance of the CFTAH.
  • To identify design modifications for improved CFTAH bearing performance within geometric constraints.

Main Methods:

  • Electromagnetic force calculations using ANSYS EMAG.
  • Computational fluid dynamics (CFD) simulations with ANSYS CFX, modeling blood as a non-Newtonian fluid.
  • Transient, moving mesh approach to determine the force-balanced rotor position.

Main Results:

  • Increasing stator bore radius decreased rotor power, stator wall average shear stress, and blood residence time.
  • Increasing stator bore radius increased the net blood flow rate through the journal bearing.
  • A new bearing design was selected based on simulation results, showing improved performance over the baseline.

Conclusions:

  • Stator-bearing bore radius is a key parameter for optimizing CFTAH hydraulic performance.
  • The selected new bearing design demonstrates potential for enhanced artificial heart function.
  • Further in vitro and in vivo testing will validate the performance of the improved CFTAH-bearing design.

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