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Evaluation of floating impeller phenomena in a Gyro centrifugal pump

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Title: Evaluation of floating impeller phenomena in a Gyro centrifugal pump
Authors: Nishimura, Ikuya Browse this author →KAKEN DB
Ichikawa, S. Browse this author
Mikami, M. Browse this author
Ishitoya, H. Browse this author
Motomura, T. Browse this author
Kawamura, M. Browse this author
Linneweber, J. Browse this author
Glueck, J. Browse this author
Shinohara, T. Browse this author
Nose, Y. Browse this author
Keywords: Free impeller Gyro pump
pivot bearing
impeller floating phenomenon
magnet coupling distance
the dynamic RPM suspension
Issue Date: 2013
Publisher: IOS Press
Journal Title: Bio-Medical Materials and Engineering
Volume: 23
Issue: 1-2
Start Page: 49
End Page: 55
Publisher DOI: 10.3233/BME-120731
Abstract: The Gyro centrifugal pump developed as a totally implantable artificial heart was designed with a free impeller, in which the rotational shaft (male bearing) of the impeller was completely separated from the female bearing. For this type of pump, it is very important to keep the proper magnet balance (impeller-magnet and actuator-magnet) in order to prevent thrombus formation and/or bearing wear. When the magnet balance is not proper, the impeller is jerked down into the bottom bearing. On the other hand, if magnet balance is proper, the impeller lifted off the bottom of the pump housing within a certain range of pumping conditions. In this study, this floating phenomenon was investigated in detail. The floating phenomenon was proved by observation of the impeller behavior using a transparent acrylic pump. The impeller floating phenomenon was mapped on a pump performance curve. The impeller floating phenomenon is affected by the magnet-magnet coupling distance and rotational speed of the impeller. In order to keep the proper magnet balance and to maintain the impeller floating phenomenon at the driving condition of right and left pump, the magnet-magnet coupling distance was altered by a spacer which was installed between the pump and actuator. It became clear that the same pump could handle different conditions (right and left ventricular assist), by just changing the thickness of the spacer. When magnet balance is proper, the floating impeller phenomenon occurs automatically in response to the impeller rev. It is called "the dynamic RPM suspension".
Type: article (author version)
Appears in Collections:情報科学院・情報科学研究院 (Graduate School of Information Science and Technology / Faculty of Information Science and Technology) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 西村 生哉

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