Magnetically suspended centrifugal blood pump with a radial magnetic driver. 2005

Hideo Hoshi, and Kiroyuki Katakoa, and Katsuhiro Ohuchi, and Jun-ichi Asama, and Tadahiko Shinshi, and Akira Shimokohbe, and Setsuo Takatani
Department of Artificial Organs, Institute of Biomaterials and Bioengineering, Tokyo Medical and Dental University, Tokyo, Japan.

A new magnetic bearing has been designed to achieve a low electronic power requirement and high stiffness. The magnetic bearing consists of 1) radial passive forces between the permanent magnet ring mounted inside the impeller rotor and the electromagnet core materials in the pump casing and 2) radial active forces generated by the electromagnets using the two gap sensor signals. The magnetic bearing was assembled into a centrifugal rotary blood pump (CRBP) driven with a radial, magnetic coupled driver. The impeller vane shape was designed based upon the computational fluid dynamic simulation. The diameter and height of the CRBP were 75 mm and 50 mm, respectively. The magnetic bearing system required the power of 1.0-1.4 W. The radial impeller movement was controlled to within +/- 10 microm. High stiffness in the noncontrolled axes, Z, phi, and theta, was obtained by the passive magnetic forces. The pump flow of 5 L/min against 100 mm Hg head pressure was obtained at 1,800 rpm with the electrical to hydraulic efficiency being greater than 15%. The Normalized Index of Hemolysis (NIH) of the magnetic bearing CRBP was one fifth of the BioPump BP-80 and one half of the NIKKISO HPM-15 after 4 hours. The newly designed magnetic bearing with two degrees of freedom control in combination with optimized impeller vane was successful in achieving an excellent hemolytic performance in comparison with the clinical centrifugal blood pumps.

UI MeSH Term Description Entries
D008280 Magnetics The study of MAGNETIC PHENOMENA. Magnetic
D001783 Blood Flow Velocity A value equal to the total volume flow divided by the cross-sectional area of the vascular bed. Blood Flow Velocities,Flow Velocities, Blood,Flow Velocity, Blood,Velocities, Blood Flow,Velocity, Blood Flow
D002498 Centrifugation Process of using a rotating machine to generate centrifugal force to separate substances of different densities, remove moisture, or simulate gravitational effects. It employs a large motor-driven apparatus with a long arm, at the end of which human and animal subjects, biological specimens, or equipment can be revolved and rotated at various speeds to study gravitational effects. (From Websters, 10th ed; McGraw-Hill Dictionary of Scientific and Technical Terms, 4th ed)
D004867 Equipment Design Methods and patterns of fabricating machines and related hardware. Design, Equipment,Device Design,Medical Device Design,Design, Medical Device,Designs, Medical Device,Device Design, Medical,Device Designs, Medical,Medical Device Designs,Design, Device,Designs, Device,Designs, Equipment,Device Designs,Equipment Designs
D005069 Evaluation Studies as Topic Works about studies that determine the effectiveness or value of processes, personnel, and equipment, or the material on conducting such studies. Critique,Evaluation Indexes,Evaluation Methodology,Evaluation Report,Evaluation Research,Methodology, Evaluation,Pre-Post Tests,Qualitative Evaluation,Quantitative Evaluation,Theoretical Effectiveness,Use-Effectiveness,Critiques,Effectiveness, Theoretical,Evaluation Methodologies,Evaluation Reports,Evaluation, Qualitative,Evaluation, Quantitative,Evaluations, Qualitative,Evaluations, Quantitative,Indexes, Evaluation,Methodologies, Evaluation,Pre Post Tests,Pre-Post Test,Qualitative Evaluations,Quantitative Evaluations,Report, Evaluation,Reports, Evaluation,Research, Evaluation,Test, Pre-Post,Tests, Pre-Post,Use Effectiveness
D006353 Heart-Assist Devices Small pumps, often implantable, designed for temporarily assisting the heart, usually the LEFT VENTRICLE, to pump blood. They consist of a pumping chamber and a power source, which may be partially or totally external to the body and activated by electromagnetic motors. Artificial Ventricle,Heart Assist Device,Heart Ventricle, Artificial,Pumps, Heart-Assist,Vascular-Assist Device,Vascular-Assist Devices,Ventricle-Assist Device,Ventricular Assist Device,Artificial Heart Ventricle,Artificial Heart Ventricles,Artificial Ventricles,Assist Device, Heart,Assist Device, Ventricular,Assist Devices, Heart,Assist Devices, Ventricular,Device, Heart Assist,Device, Heart-Assist,Device, Vascular-Assist,Device, Ventricle-Assist,Device, Ventricular Assist,Devices, Heart Assist,Devices, Heart-Assist,Devices, Vascular-Assist,Devices, Ventricle-Assist,Devices, Ventricular Assist,Heart Assist Devices,Heart Ventricles, Artificial,Heart-Assist Device,Heart-Assist Pump,Heart-Assist Pumps,Pump, Heart-Assist,Pumps, Heart Assist,Vascular Assist Device,Vascular Assist Devices,Ventricle Assist Device,Ventricle, Artificial,Ventricle, Artificial Heart,Ventricle-Assist Devices,Ventricles, Artificial,Ventricles, Artificial Heart,Ventricular Assist Devices
D006801 Humans Members of the species Homo sapiens. Homo sapiens,Man (Taxonomy),Human,Man, Modern,Modern Man
D001698 Biomedical Engineering Application of principles and practices of engineering science to biomedical research and health care. Clinical Engineering,Engineering, Clinical,Engineering, Biomedical

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