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Magnetic bearing in blood pump systems

Huzlik R., Lapčik J.

Maszyny Elektryczne : zeszyty problemowe

2010

Nr 88

225-227

Since the eighties years of the last century, scientists of the Department of Electrical Machines, TUB with cooperation of Brno University Medical Faculty tried to developed a mechanical device to temporarily supplant heart action. During these years the first artificial heart (made from polyurethane) was implanted inside a goat and consequently inside a calf body. Blood pump development continued and devices became smaller, lighter and more acceptable. A number of plastic pumps of long life time were also developed. During nineties new political administration cut financial sources and imposed more restrictive rules to the medical devices standards, also leading to higher development costs. The extensive research program was in Medical Faculty reduced and consequently also in our department only to the electromechanical part of the artificial heart. In cooperation with the Victor Kaplan Department of Fluid Engineering we have continued in the field of mechatronic drive destined for centrifugal and whirling blood pump. Some of these mechatronic systems were manufactured and tested in laboratory conditions and published in the previous papers. The paper presented deals with the test experiences of the magnetic active bearings used in the mechatronic system of the total artificial heart and presents some new proposal and discussion in the different types of the magnetic passive bearings, which could be in some cases more suitable than magnetic active ones.

Mechanical circulatory support systems at Tokyo Medical and Dental University

Ohuchi K., Hoshi H., Watanabe N., Kido K., Yokoyama Y., Asama J., Shinshi T., Shimokohbe A., Yoshikawa M., Takatani M.

Biocybernetics and Biomedical Engineering

2007

Vol. 27, no. 1-2

161-167

This paper describes mechanical circulatory support devices (MCSD) which are under development at Tokyo Medical and Dental University in collaboration with Tokyo Institute of Technology. They include para-corporeal magnetic levitated (Mag-lev) centrifugal blood pump, implantable Mag-lev centrifugal blood pump, extra-corporeal pediatric centrifugal blood pump, and implantable pulsatile ventricular assist device (VAD) and totally replacement artificial heart system.

Stereoscopic particle image velocimetry for application in three-dimensional flow within a spiral vortex pulsatile blood pump

Yagi T., Yang W., Ishikawa D., Iwasaki K., Umezu M.

Biocybernetics and Biomedical Engineering

2006

Vol. 26, no. 2

53-62

There is currently no multidimensional flow diagnostic tool developed which is capable of elucidating 3D complex flow structures in pulsatile ventricular assist devices (VAD). According to recent clinical reports, most VAD may have a persistent risk of thromboembolism even in administration of systematic medical therapy. The present study, therefore, aims to demonstrate the applicability of Stereoscopic ParticIe Image Velocimetry (SPIV) for characterizing highly 3D complex flows within a pulsatile blood pump. SPIV measurements were carried out within a Spiral Vortex pulsatile blood pump (SV pump). In order to assess the measurement accuracy, the results were compared with those obtained with Laser Doppler Anemometry (LDA). In experiments, a full-scale Perspex model of the SV pump was employed. A Newtonian blood-analog fluid was used with the approximately same refractive index as the Perspex. A flow rate was set at 8.3 L/min (Re=2500) under steady conditions. SPIV measurements revealed 3D complex flow characteristics of a steady swirling flow generated within a conical housing. The flow, similar to a model of Rankine vortex, exhibited intricate natures in a three-dimensional manner, particularly in a core region at the swirling center and in the immediate downstream of inlet flow. In measurement comparisons, the results of SPIV measurements were in agreement with those from LDA. These results successfully demonstrated the viability as well as the efficacy of SPIV measurement in investigating 3D complex flows within the SV pump.