In vitro hydrodynamics of four bileaflet valves in mitral position

Z. G. Feng, Mitsuo Umezu, T. Fujimoto, T. Tsukahara, M. Nurishi, D. Kawaguchi

    Research output: Contribution to journalArticle

    2 Citations (Scopus)

    Abstract

    Hydrodynamics of St. Jude Medical, Carbomedics, Advancing The Standard, and On-X bileaflet valves with an annular diameter of 25 mm were obtained using an in-vitro test system. Steady flow studies demonstrated different pressure drops due to differences in valve design, particularly the geometric orifice diameter and the opening angle. The On-X valve produced the least pressure drop, whereas the Carbomedics valve had the greatest pressure drop. In pulsatile flow experiments, the On-X and St. Jude Medical valves consistently produced the lowest mean positive pressure gradients, while the Carbomedics valve had the highest gradients. In spite of its parallel leaflets design, the On-X valve showed a closing volume as small as that of Carbomedics valve. The results indicate that a larger orifice diameter and greater opening angle can significantly reduce transvalvular pressure loss. This study also demonstrated that attempts to improve the hydrodynamic efficacy of the On-X valve were successful in reducing the pressure gradient as well as maintaining a low closing volume.

    Original languageEnglish
    Pages (from-to)3-10
    Number of pages8
    JournalAsian Cardiovascular and Thoracic Annals
    Volume8
    Issue number1
    Publication statusPublished - 2000

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    Hydrodynamics
    Mitral Valve
    Pressure
    Closing Volume
    Pulsatile Flow
    In Vitro Techniques

    ASJC Scopus subject areas

    • Cardiology and Cardiovascular Medicine

    Cite this

    Feng, Z. G., Umezu, M., Fujimoto, T., Tsukahara, T., Nurishi, M., & Kawaguchi, D. (2000). In vitro hydrodynamics of four bileaflet valves in mitral position. Asian Cardiovascular and Thoracic Annals, 8(1), 3-10.

    In vitro hydrodynamics of four bileaflet valves in mitral position. / Feng, Z. G.; Umezu, Mitsuo; Fujimoto, T.; Tsukahara, T.; Nurishi, M.; Kawaguchi, D.

    In: Asian Cardiovascular and Thoracic Annals, Vol. 8, No. 1, 2000, p. 3-10.

    Research output: Contribution to journalArticle

    Feng, ZG, Umezu, M, Fujimoto, T, Tsukahara, T, Nurishi, M & Kawaguchi, D 2000, 'In vitro hydrodynamics of four bileaflet valves in mitral position', Asian Cardiovascular and Thoracic Annals, vol. 8, no. 1, pp. 3-10.
    Feng ZG, Umezu M, Fujimoto T, Tsukahara T, Nurishi M, Kawaguchi D. In vitro hydrodynamics of four bileaflet valves in mitral position. Asian Cardiovascular and Thoracic Annals. 2000;8(1):3-10.
    Feng, Z. G. ; Umezu, Mitsuo ; Fujimoto, T. ; Tsukahara, T. ; Nurishi, M. ; Kawaguchi, D. / In vitro hydrodynamics of four bileaflet valves in mitral position. In: Asian Cardiovascular and Thoracic Annals. 2000 ; Vol. 8, No. 1. pp. 3-10.
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    AU - Nurishi, M.

    AU - Kawaguchi, D.

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