Mechanical antithrombogenic properties by vibrational excitation of the impeller in a magnetically levitated centrifugal blood pump

2019 ◽  
Vol 43 (9) ◽  
pp. 849-859 ◽  
Author(s):  
Tomotaka Murashige ◽  
Wataru Hijikata
Keyword(s):  
Vibrational Excitation ◽  
Blood Pump ◽  
Centrifugal Blood Pump ◽  
Magnetically Levitated

Estimation of the radial force using a disturbance force observer for a magnetically levitated centrifugal blood pump

2009 ◽  
Vol 224 (7) ◽  
pp. 913-924 ◽  
Author(s):  
C N Pai ◽  
T Shinshi ◽  
A Shimokohbe
Keyword(s):  
Rotational Speed ◽  
Fluid Dynamic ◽  
Radial Force ◽  
Magnetic Bearing ◽  
Blood Pump ◽  
Working Fluid ◽  
Computational Fluid Dynamic Analysis ◽  
Centrifugal Blood Pump ◽  
Magnetically Levitated ◽  
Radial Thrust

Evaluation of the hydraulic forces in a magnetically levitated (maglev) centrifugal blood pump is important from the point of view of the magnetic bearing design. Direct measurement is difficult due to the absence of a rotor shaft, and computational fluid dynamic analysis demands considerable computational resource and time. To solve this problem, disturbance force observers were developed, using the radial controlled magnetic bearing of a centrifugal blood pump, to estimate the radial forces on the maglev impeller. In order to design the disturbance observer, the radial dynamic characteristics of a maglev impeller were evaluated under different working conditions. It was observed that the working fluid affects the additional mass and damping, while the rotational speed affects the damping and stiffness of the maglev system. Based on these results, disturbance force observers were designed and implemented. The designed disturbance force observers present a bandwidth of 45 Hz. In non-pulsatile conditions, the magnitude of the estimated radial thrust increases in proportion to the flowrate, and the rotational speed has little effect on the force direction. At 5 l/min against 100 mmHg, the estimated radial thrust is 0.95 N. In pulsatile conditions, this method was capable of estimating the pulsatile radial thrust with good response.

Dynamic Characteristics of a Magnetically Levitated Impeller in a Centrifugal Blood Pump

2007 ◽  
Vol 31 (4) ◽  
pp. 301-311 ◽  
Author(s):  
Junichi Asama ◽  
Tadahiko Shinshi ◽  
Hideo Hoshi ◽  
Setsuo Takatani ◽  
Akira Shimokohbe
Keyword(s):  
Dynamic Characteristics ◽  
Blood Pump ◽  
Centrifugal Blood Pump ◽  
Magnetically Levitated

MedTech Mag-Lev, Single-use, Extracorporeal Magnetically Levitated Centrifugal Blood Pump for Mid-term Circulatory Support

ASAIO Journal ◽  
2013 ◽  
Vol 59 (3) ◽  
pp. 246-252 ◽  
Author(s):  
Eiki Nagaoka ◽  
Tatsuki Fujiwara ◽  
Takashi Kitao ◽  
Daisuke Sakota ◽  
Tadahiko Shinshi ◽  
...  
Keyword(s):  
Blood Pump ◽  
Circulatory Support ◽  
Centrifugal Blood Pump ◽  
Single Use ◽  
Magnetically Levitated

IMPROVEMENT OF A MAGNETICALLY LEVITATED CENTRIFUGAL BLOOD PUMP

ASAIO Journal ◽  
2002 ◽  
Vol 48 (2) ◽  
pp. 135
Author(s):  
Hiroyuki Onuma ◽  
Toru Masurawa ◽  
Ken-ichl Matsuda ◽  
Yohji Okada
Keyword(s):  
Blood Pump ◽  
Centrifugal Blood Pump ◽  
Magnetically Levitated
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