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Development and initial performance of a miniature axial flow blood pump using magnetic fluid shaft seal

  • Original Article
  • Artificial Heart (Basic)
  • Published:
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Abstract

In this study, we developed a new catheter-mounted micro-axial flow blood pump (MFBP) using a new miniature magnetic fluid shaft seal (MFSS). The prototype of the catheter-mounted MFBP had a maximum diameter of 8 mm and a length of 50 mm. The new MFSS composed a neodymium magnet ring, an iron ring, and a magnetic fluid particularly designed for the MFSS. The new MFSS had outer and inner diameters of 4.0 mm and 2.6 mm, respectively, and a length of 3.0 mm. The sealing pressure of the MFSS was calculated to be 432 mmHg using FEM (Finite Element Method) result; therefore, the MFSS had sufficient sealing pressure for the catheter-mounted MFBP. The friction loss of the MFSS included the friction owing to the viscosity of the magnetic fluid and the magnetic force between the iron ring and ring magnet. The total friction loss of the MFSS was 0.08–0.09 W in the pump operational speed range from 22,000 to 35,000 rpm. From the in vitro experimental results, the catheter-mounted MFBP using the MFSS had a pump output of 3 L/min. against a differential pressure of 60 mmHg, and the pump characteristics of the MFBP were almost the same as those of Impella 5.0.

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Acknowledgements

This study was supported by KAKENHI (Grant-in-Aid for Scientific Research-C (No. 19K12792)), and supported by research program of Institute of Development, Aging and Cancer, Tohoku University (No. 2021_23).

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Authors and Affiliations

  1. Graduate School of Biology, Tokai University, Minami-sawa 5-1-1-1, Minami-ku, Sapporo, 005-8601, Japan

    Eiji Okamoto

  2. Graduate School of Science and Engineering, Hirosaki University, Hirosaki, Japan

    Tetsuya Yano

  3. Research Division of Medical & Dental & Pharmacy, Tokushima University, Tokushima, Japan

    Kazumitsu Sekine

  4. Advanced Biomedical Research Center, Asahikawa Medical University, Asahikawa, Japan

    Yusuke Inoue

  5. Institute of Development Aging and Cancer, Tohoku University, Sendai, Japan

    Yusuke Inoue, Yasuyuki Shiraishi & Tomoyuki Yambe

  6. Emeritus Professor, Hokkaido University, Sapporo, Japan

    Yoshinori Mitamura

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  1. Eiji Okamoto
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  2. Tetsuya Yano
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  3. Kazumitsu Sekine
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  4. Yusuke Inoue
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  5. Yasuyuki Shiraishi
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  6. Tomoyuki Yambe
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  7. Yoshinori Mitamura
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Correspondence to Eiji Okamoto.

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Okamoto, E., Yano, T., Sekine, K. et al. Development and initial performance of a miniature axial flow blood pump using magnetic fluid shaft seal. J Artif Organs 26, 12–16 (2023). https://doi.org/10.1007/s10047-022-01330-7

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  • DOI: https://doi.org/10.1007/s10047-022-01330-7

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