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In vitro hemodynamic analysis of flexible artificial ventricles.

K B Chandran1, C S Lee, T Shipkowitz

  • 1Department of Biomedical Engineering, University of Iowa, Iowa City 52242.

Artificial Organs
|October 1, 1991
PubMed
Summary

A flexible total artificial heart shows promising hemodynamic characteristics compared to rigid models. This research suggests it

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Area of Science:

  • Biomedical Engineering
  • Cardiovascular Research
  • Fluid Dynamics

Background:

  • Total artificial hearts (TAHs) are critical for end-stage heart failure.
  • Comparing rigid and flexible TAH designs is essential for improving hemocompatibility.
  • Existing TAHs present challenges in implantation and long-term function.

Purpose of the Study:

  • To compare the fluid dynamic performance of a rigid TAH versus a flexible TAH.
  • To evaluate hemodynamic characteristics including pressure and flow dynamics.
  • To assess the potential of a flexible TAH as a bridge to transplant.

Main Methods:

  • In vitro fluid dynamic study using a mock circulatory system.
  • Measurement of ventricular chamber pressure and flow rates using electromagnetic probes.
  • Flow visualization to analyze fluid motion within the artificial ventricles.

Main Results:

  • Flexible TAH exhibited vortical motion and smoother washout but also flow disturbances.
  • The rate of pressure increase (dP/dt) was lower in the flexible ventricle.
  • Comparable flows and heart rates were maintained between the rigid and flexible designs.

Conclusions:

  • The flexible TAH demonstrates viable hemodynamic performance.
  • Potential advantages include ease of implantation and cost-effectiveness.
  • The flexible TAH is a promising alternative for bridging patients to heart transplantation.