Recent advances in the gyro centrifugal ventricular assist device

Tadashi Nakazawa, Robert Benkowski, Kenzo Makinouchi, Yoshiyuki Takami, Satoshi Ohtsubo, Julie Glueck, Koji Kawahito, Akinori Sueoka, Helmut Schmallegger, Heinrich Schima, Ernst Wolner, Yukihiko Nosé

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)


The gyro pump was developed as an intermediate-term assist pump (C1E3) as well as a long-term centrifugal ventricular assist device (VAD). The antithrombogenic design concept of this pump was confirmed throughout three 1 month ex vivo studies. The normalized index of hemolysis (NIH) of this gyro C1E3 model was lower than that of the BP-80. In the next step, a miniaturized centrifugal blood pump (The Gyro permanently implantable model PI-601) has been developed for use as a permanently implantable device after design optimization. A special motor design of the magnet circuit was utilized in this system in collaboration with the University of Vienna. The priming volume of this pump is 20 ml. The overall size of the pump actuator package is 53 mm in height, 65 mm in diameter, 145 ml of displacement volume, and 305 g in weight. This pump can provide 5 L/min against 120 mm Hg total pressure head at 2,000 rpm. The NIH value of this pump was comparable to that of the BP-80. The gyro PI-601 model is suitable for a VAD. The expected life from the endurance study is approximately 8 years. The evolution from C1E3 to the PI-601 converts this pump to a totally implantable centrifugal pump. Recent technologic advances in continuous flow devices are likely to realize a miniaturized and economical totally implantable VAD.

Original languageEnglish
Pages (from-to)94-97
Number of pages4
JournalASAIO Journal
Issue number1
Publication statusPublished - 1998
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Biophysics
  • Bioengineering
  • Biomaterials
  • Biomedical Engineering


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