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Related Experiment Videos

Ventricular assist device volume compensation using a two phase fluid.

T C Lamson1, D B Geselowitz, J M Tarbell

  • 1Bioengineering Program, Pennsylvania State University, University Park 16802.

ASAIO Transactions
|July 1, 1990
PubMed
Summary
This summary is machine-generated.

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A new two-phase fluid (TPF) volume compensation chamber (VCC) reduces pressure fluctuations in electric ventricular assist devices (VADs). While effective, temperature fluctuations impact VAD power consumption, potentially requiring thermal regulation.

Area of Science:

  • Biomedical Engineering
  • Fluid Dynamics
  • Medical Devices

Background:

  • Electric ventricular assist devices (VADs) can experience pressure fluctuations.
  • Current flexible compliance chambers have limitations, including fibrous ingrowth and material permeability.

Purpose of the Study:

  • To develop and evaluate a two-phase fluid (TPF) volume compensation chamber (VCC) for electric VADs.
  • To assess the performance of the TPF VCC in reducing pressure fluctuations and its impact on VAD function.

Main Methods:

  • A TPF VCC utilizing Freon as a working fluid was designed and tested.
  • Experiments involved attaching the VCC to an electric VAD within a mock circulatory system.
  • Performance was evaluated across a temperature range of 6 degrees C.

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Main Results:

  • The TPF VCC effectively reduced pressure fluctuations in the electric VAD.
  • VAD flow output remained stable despite Freon's temperature sensitivity over a 6 degrees C range.
  • A decrease in VCC temperature by 6 degrees C led to a 95 mmHg drop in system pressure, increasing power consumption.

Conclusions:

  • The TPF VCC offers advantages over traditional chambers, including rigid walls and lower diaphragm permeability.
  • The system shows promise for VADs, as flow output is not significantly compromised by typical body temperature variations.
  • Increased power consumption at lower temperatures necessitates consideration of temperature control systems for optimal VAD operation.