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Related Experiment Videos

Control strategy for rotary blood pumps.

K Ohuchi1, D Kikugawa, K Takahashi

  • 1Department of Artificial Organs, Institute of Biomaterials and Bioengineering, Kawasaki Medical College, Kurashiki, Japan.

Artificial Organs
|June 14, 2001
PubMed
Summary

This study presents a control strategy for centrifugal blood pumps used in ventricular support. It optimizes pump speed to match bodily demand, minimizing suction and assessing ventricular function for device weaning.

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Area of Science:

  • Biomedical Engineering
  • Cardiovascular Technology
  • Medical Device Control

Background:

  • Optimizing centrifugal blood pump speed is crucial for effective and safe long-term circulatory support.
  • Continuous monitoring of ventricular function aids in successful weaning from ventricular assist devices (VADs).

Purpose of the Study:

  • To develop and evaluate a control strategy for centrifugal blood pumps in ventricular support.
  • To determine optimal pump speed reflecting bodily demand and minimize adverse effects like suction.
  • To assess ventricular function for successful VAD weaning.

Main Methods:

  • Determined target pump speed using relationships between native heart rate, cardiac output, and pump output.
  • Fine-tuned pump speed by analyzing motor current waveform's power spectral density to detect suction.

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  • Assessed ventricular function via motor current waveform amplitude.
  • Implemented and tested the control system using a Digital Signal Processor (DSP) in mock loops and animal experiments.

    • Main Results:

    • The DSP-based control system performed effectively in mock circulatory loops and acute animal experiments.
    • Motor current analysis successfully identified suction effects in the ventricle (ratio > 0.2).
    • Motor current amplitude correlated well with ventricular pressure in animal studies.

    Conclusions:

    • The proposed control strategy effectively manages centrifugal blood pump speed for ventricular support.
    • Motor current analysis provides a reliable method for suction detection and ventricular function assessment.
    • This approach supports safe and effective VAD operation and patient weaning.