Effect of Compliance of Surface Pitting Erosion of a Mechanical Heart Valve.

DOI 3 Citations 8 References

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  • 機械弁の表面壊食に及ぼすコンプライアンスの影響に関する検討

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Abstract

Since the discovery, in the 1980 s, of erosion-pit-induced fractures in implanted mechanical heart valves, cavitation on the surface of mechanical heart valves has been widely studied as a possible cause of pitting. We previously performed accelerated fatigue tests on artificial valves and found that both the number and diameter of pits were increased by compliance of a vessel wall near the valve. In this study, we measured pressure waveforms near a valve and closing velocities of a disk, which were placed in a holder with and without compliance. It was found that negative peak pressure near the valve with compliance was smaller than that of the rigid holder, but that the duration of the low pressure was longer. It was also found that the closing velocity of the disk increased and that cavitation erosion was enhanced in the rigid valve holders. These results suggest that disk closing velocity during the closing phase has significant effects on pitting erosion.

Journal

  • Jinko Zoki

    Jinko Zoki 28 (2), 436-441, 1999

    JAPANESE SOCIETY FOR ARTIFICIAL ORGANS

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