論文

査読有り 筆頭著者
2016年6月

Effect of impeller geometry on lift-off characteristics and rotational attitude in a monopivot centrifugal blood pump

ARTIFICIAL ORGANS
  • Masahiro Nishida
  • ,
  • Kento Nakayama
  • ,
  • Daisuke Sakota
  • ,
  • Ryo Kosaka
  • ,
  • Osamu Maruyama
  • ,
  • Yasuo Kawaguchi
  • ,
  • Katsuyuki Kuwana
  • ,
  • Takashi Yamane

40
6
開始ページ
E89
終了ページ
E101
記述言語
英語
掲載種別
研究論文(学術雑誌)
DOI
10.1111/aor.12697
出版者・発行元
WILEY-BLACKWELL

The effect of the flow path geometry of the impeller on the lift-off and tilt of the rotational axis of the impeller against the hydrodynamic force was investigated in a centrifugal blood pump with an impeller supported by a single-contact pivot bearing. Four types of impeller were compared: the FR model with the flow path having both front and rear cutouts on the tip, the F model with the flow path having only a front cutout, the R model with only a rear cutout, and the N model with a straight flow path. First, the axial thrust and the movement about the pivot point, which was loaded on the surface of the impeller, were calculated using computational fluid dynamics (CFD) analysis. Next, the lift-off point and the tilt of the rotational axis of the impeller were measured experimentally. The CFD analysis showed that the axial thrust increased gently in the FR and R models as the flow rate increased, whereas it increased drastically in the F and N models. This difference in axial thrust was likely from the higher pressure caused by the smaller circumferential velocity in the gap between the top surface of the impeller and the casing in the FR and R models than in the F and N models, which was caused by the rear cutout. These results corresponded with the experimental results showing that the impellers lifted off in the F and N models as the flow rate increased, whereas it did not in the FR and R models. Conversely, the movement about the pivot point increased in the direction opposite the side with the pump outlet as the flow rate increased. However, the tilt of the rotational axis of the impeller, which oriented away from the pump outlet, was less than 0.8 degrees in any model under any conditions, and was considered to negligibly affect the rotational attitude of the impeller. These results confirm that a rear cutout prevents lift-off of the impeller caused by a decrease in the axial thrust.


リンク情報
DOI
https://doi.org/10.1111/aor.12697
Web of Science
https://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=JSTA_CEL&SrcApp=J_Gate_JST&DestLinkType=FullRecord&KeyUT=WOS:000378542100001&DestApp=WOS_CPL
URL
http://orcid.org/0000-0001-8075-2269
ID情報
  • DOI : 10.1111/aor.12697
  • ISSN : 0160-564X
  • eISSN : 1525-1594
  • ORCIDのPut Code : 46043613
  • Web of Science ID : WOS:000378542100001

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