In vitro hydrodynamic characteristics among three bileaflet valves in the mitral position

Zhonggang Feng, Mitsuo Umezu, Tetsuo Fujimoto, Toshiya Tsukahara, Masakazu Nurishi, Daisuke Kawaguchi

    Research output: Contribution to journalArticle

    20 Citations (Scopus)

    Abstract

    The non-fully open phenomenon of the advancing standard medical bileaflet heart valves (the ATS valve) are frequently observed in clinical cases, even though there is no problem with their hemodynamic function. The movement of the leaflets was affected easily by the transvalvular flow because of the unique open pivot design of the ATS valve. In this paper, a comparative in vitro hydrodynamic test was conducted among 3 different types of bileaflet valves, and the effect of different shapes of downstream conduits, which induce different transvalvular flow, on hydrodynamic performance was studied. Three bileaflet valves, the ATS valve, CarboMedics valve (CM), and St. Jude Medical valve (SJM), with an annulus diameter of 29 mm for the mitral position were chosen throughout our experiments. First, pressure drops across the valves under steady flow were measured. Then, the valves were tested at the mitral position with our pneumatically driven pulsatile pump. In this pulsatile flow study, 2 different conduits (straight shape and abrupt enlargement shape) were in turn incorporated at the downstream portion of the mitral valve. A high-speed video camera was employed to observe leaflet movements. In a steady-flow test, the ATS and the SJM produced the same pressure drop, but the CM recorded a higher value. In the pulsatile study, it was observed that the ATS leaflets did not open fully in the mitral position when the downstream conduit with an abrupt enlargement shape was incorporated. However, the CM and the SJM always indicated a fully open movement regardless of the shape of downstream conduits. When the straight downstream conduit was incorporated, the ATS produced a similar pressure drop to that of the SJM, which coincided with the steady test results. When the enlargement conduit was incorporated, however, the ATS presented the lowest pressure drop despite the non-fully open movement. The conduit shape at the valve downstream had a significant influence on the closing volume. These findings indicate that the conduit shape at the valve outlet can affect the hydrodynamic characteristics of bileaflet valves.

    Original languageEnglish
    Pages (from-to)346-354
    Number of pages9
    JournalArtificial Organs
    Volume24
    Issue number5
    DOIs
    Publication statusPublished - 2000

    Fingerprint

    Hydrodynamics
    Mitral Valve
    Pressure drop
    Pressure
    Steady flow
    Closing Volume
    Pulsatile Flow
    Pulsatile flow
    High speed cameras
    Heart Valves
    Hemodynamics
    Video cameras
    Pumps
    In Vitro Techniques
    Experiments

    Keywords

    • Bileaflet valve
    • Influence of conduit shape
    • Leaflet movement
    • Mitral position

    ASJC Scopus subject areas

    • Biophysics

    Cite this

    In vitro hydrodynamic characteristics among three bileaflet valves in the mitral position. / Feng, Zhonggang; Umezu, Mitsuo; Fujimoto, Tetsuo; Tsukahara, Toshiya; Nurishi, Masakazu; Kawaguchi, Daisuke.

    In: Artificial Organs, Vol. 24, No. 5, 2000, p. 346-354.

    Research output: Contribution to journalArticle

    Feng, Zhonggang ; Umezu, Mitsuo ; Fujimoto, Tetsuo ; Tsukahara, Toshiya ; Nurishi, Masakazu ; Kawaguchi, Daisuke. / In vitro hydrodynamic characteristics among three bileaflet valves in the mitral position. In: Artificial Organs. 2000 ; Vol. 24, No. 5. pp. 346-354.
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