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The pulsatile impeller pump for left ventricular assist

S S Wang1, S H Chu, N K Chou

  • 1Department of Surgery, National Taiwan University, Taipei.

Artificial Organs
|December 1, 1996
PubMed
Summary
This summary is machine-generated.

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A novel motor-driven pulsatile implantable impeller pump was developed to overcome hemolysis issues in traditional devices. This new pump demonstrated competent pulsatile function with minimal blood damage and organ dysfunction in calf models.

Area of Science:

  • Biomedical Engineering
  • Cardiovascular Surgery

Background:

  • Traditional centrifugal pumps cause severe hemolysis, limiting their use for long-term cardiac support.
  • Developing implantable pumps with pulsatile flow is crucial for advanced heart failure treatment.

Purpose of the Study:

  • To develop and evaluate a motor-driven pulsatile implantable impeller pump designed to minimize blood damage.
  • To assess the efficacy and safety of this novel pump in a large animal model.

Main Methods:

  • A pulsatile impeller pump was designed with optimized vane geometry and driven by a square waveform voltage for speed modulation.
  • The device was implanted in nine calves (80-100 kg) to support the left ventricle via connection to the left atrium and descending aorta.
  • Post-implantation monitoring included hemodynamic measurements, organ function assessment, and blood analysis for hemolysis and thrombosis markers.

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Main Results:

  • The pump achieved competent pulsatile flow, supporting 40-50% of cardiac output in calves for up to 54 days.
  • No significant liver or renal dysfunction was observed during the study period.
  • While hemoglobin and hematocrit decreased due to bleeding, free hemoglobin levels remained stable, indicating minimal hemolysis.

Conclusions:

  • The developed motor-driven pulsatile impeller pump shows promise as a safe and effective device for long-term cardiac support.
  • The design effectively reduces blood damage and organ dysfunction compared to traditional pumps.
  • Further research is warranted to optimize the device for clinical application in heart failure patients.