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Development of a Magnetic Fluid Shaft Seal for an Axial‐Flow Blood Pump
Author(s) -
Sekine Kazumitsu,
Mitamura Yoshinori,
Murabayashi Shun,
Nishimura Ikuya,
Yozu Ryouhei,
Kim DongWook
Publication year - 2003
Publication title -
artificial organs
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.684
H-Index - 76
eISSN - 1525-1594
pISSN - 0160-564X
DOI - 10.1046/j.1525-1594.2003.00035.x
Subject(s) - impeller , seal (emblem) , abrasive , axial compressor , blood flow , suspension (topology) , materials science , centrifugal pump , mechanical engineering , magnetic bearing , biomedical engineering , gas compressor , mechanics , composite material , engineering , medicine , physics , magnet , mathematics , art , homotopy , pure mathematics , visual arts
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.