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Viscosity01:17

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In Vitro Thrombosis Test for Ventricular Assist Devices
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Measuring real-time blood viscosity with a ventricular assist device.

Wataru Hijikata1, Takuro Maruyama1, Yuki Suzumori2

  • 11 School of Engineering, Tokyo Institute of Technology, Tokyo, Japan.

Proceedings of the Institution of Mechanical Engineers. Part H, Journal of Engineering in Medicine
|March 22, 2019
PubMed
Summary

This study adapted a ventricular assist device (VAD) to measure blood viscosity, eliminating the need for separate viscometers in artificial hearts. The VAD

Keywords:
Artificial organscardiovascular system mechanicshemodynamicsintelligent sensingmechanical circulatory supportmechatronics in medicinemonitoringnon-Newtonian lubricantssensors/sensor applications

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Area of Science:

  • Biomedical Engineering
  • Cardiovascular Technology
  • Fluid Dynamics

Background:

  • Ventricular assist devices (VADs) are crucial for blood circulation in artificial hearts.
  • Measuring blood parameters like viscosity is essential but requires additional devices.
  • Integrating measurement capabilities into existing VADs is desirable to minimize invasiveness.

Purpose of the Study:

  • To adapt a VAD for intrinsic blood viscosity measurement.
  • To eliminate the need for separate viscometers in artificial heart systems.
  • To validate the accuracy of VAD-based viscosity measurements.

Main Methods:

  • Radial vibration excitation of the VAD impeller using its magnetic levitation system.
  • Simultaneous exposure of blood to low (≈100/s) and high (>10,000/s) shear rates.
  • Determination of the dominant shear rate influencing apparent viscosity measurements.

Main Results:

  • The VAD-based viscosity measurements showed good agreement with a reference concentric cylindrical viscometer.
  • The mean absolute deviation was 0.12 mPa·s for porcine blood samples.
  • The method accurately measured blood viscosity across a range of 2.32 to 2.75 mPa·s.

Conclusions:

  • A VAD can be effectively adapted to measure blood viscosity.
  • This integrated approach reduces complexity and invasiveness in artificial heart systems.
  • The proposed method offers a reliable alternative for in-situ blood viscosity monitoring.