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Disposable Magnetically Levitated Centrifugal Blood Pump: Design and In Vitro Performance
Author(s) -
Hoshi Hideo,
Asama Junichi,
Shinshi Tadahiko,
Ohuchi Katsuhiro,
Nakamura Makoto,
Mizuno Tomohiro,
Arai Hirokuni,
Shimokohbe Akira,
Takatani Setsuo
Publication year - 2005
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 - 10.1111/j.1525-1594.2005.29087.x
Subject(s) - magnetic bearing , impeller , rotor (electric) , centrifugal pump , rotodynamic pump , materials science , head (geology) , stator , magnetic levitation , suspension (topology) , electromagnetic suspension , maglev , bearing (navigation) , screw pump , progressive cavity pump , variable displacement pump , mechanical engineering , magnet , reciprocating pump , engineering , physics , electrical engineering , mathematics , geomorphology , astronomy , homotopy , pure mathematics , geology
A magnetically levitated (MagLev) centrifugal blood pump (CBP) with a disposable pump head has been designed to realize a safe, easy‐to‐handle, reliable, and low‐cost extracorporeal blood pump system. It consisted of a radial magnetic‐coupled driver with a magnetic bearing having a two‐degree freedom control and a disposable pump head unit with a priming volume of 24 mL. The easy on–off disposable pump head unit was made into a three‐piece system consisting of the top and bottom housings, and the impeller‐rotor assembly. The size and weight of the disposable pump unit were 75 mm × 45 mm and 100 g, respectively. Because the structure of the pump head unit is easily attachable and removable, the gap between the electromagnets of the stator and the target material in the rotor increased to 1.8 mm in comparison to the original integrated bearing system of 1.0 mm. The pump performance, power requirements, and controllability of the magnetic bearing revealed that from 1400 to 2400 rpm, the pump performance remained fairly unchanged. The amplitudes of the X‐ and Y‐axis rotor oscillation increased to ± 24 µm. The axial displacement of the rotor, 0.4 mm, toward the top housing was also observed at the pump rpm between 1400 and 2400. The axial and rotational stiffness of the bearing were 15.9 N/mm and 4.4 Nm/rad, respectively. The MagLev power was within 0.7 Watts. This study demonstrated the feasibility of a disposable, magnetically suspended CBP as the safe, reliable, easy‐to‐handle, low‐cost extracorporeal circulation support device.