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Evaluation of floating impeller phenomena in a Gyro centrifugal pump
| 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) |
| URI: | http://hdl.handle.net/2115/52652 |
| 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)
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Submitter: 西村 生哉
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