Development of a magnetic fluid shaft seal for an axial-flow blood pump

被引:26
作者
Sekine, K
Mitamura, Y
Murabayashi, S
Nishimura, I
Yozu, R
Kim, DW
机构
[1] Hokkaido Univ, Grad Sch Engn, Dept Biomed Syst Engn, Div Syst & Informat Engn,Kita Ku, Sapporo, Hokkaido 0608628, Japan
[2] Keio Univ, Tokyo 108, Japan
[3] Soonchunhyang Univ, Asan, Chungnam, South Korea
关键词
axial-flow blood pump; magnetic fluid seal; sealing pressure; biocompatibility;
D O I
10.1046/j.1525-1594.2003.00035.x
中图分类号
R318 [生物医学工程];
学科分类号
0831 ;
摘要
A rotating impeller in a rotary blood pump requires a supporting system in blood, such as a pivot bearing or magnetic suspension. To solve potential problems such as abrasive wear and complexity of a supporting system, a magnetic fluid seal was developed for use in an axial-flow blood pump. Sealing pressures at motor speeds of up to 8,000 rpm were measured with the seal immersed in water or bovine blood. The sealing pressure was about 200 mm Hg in water and blood. The calculated theoretical sealing pressure was about 230 mm Hg. The seal remained perfect for 743 days in a static condition and for 180+ days (ongoing test) at a motor speed of 7,000 rpm. Results of measurement of cell growth activity indicated that the magnetic fluid has no negative cytological effects. The specially designed magnetic fluid shaft seal is useful for an axial-flow blood pump.
引用
收藏
页码:892 / 896
页数:5
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