Design improvement of the Jellyfish valve for long-term use in artificial hearts

Kiyotaka Iwasaki, Mitsuo Umezu, K. Imachi, K. Iijima, T. Fujimoto

    Research output: Contribution to journalArticle

    8 Citations (Scopus)

    Abstract

    In a previous communication, we reported a leaflet fracture in a Jellyfish valve that was incorporated into a blood pump, after a 312-day animal implant duration. Subsequent finite element analysis revealed that the fracture location was consistent with an area of maximum strain concentration. Therefore, the aim of this study was to improve the durability in the light of these findings. Based on the engineering analysis results, a new valve seat having a concentric ring of 0.5-mm width, located at a radius of 7.0 mm, was designed and fabricated. Accelerated fatigue tests, conducted under the conditions recommended by ISO 5840, demonstrated that the durability of this new prototype was extended by a factor of 10, as compared to the original valve. Moreover, further finite element analysis indicated that the maximum equivalent elastic strain of the proposed new valve was reduced by 52.3% as compared to the original valve. Accordingly, it has been confirmed that the modified Jellyfish valve is suitable for use in long-term artificial hearts.

    Original languageEnglish
    Pages (from-to)463-469
    Number of pages7
    JournalInternational Journal of Artificial Organs
    Volume24
    Issue number7
    Publication statusPublished - 2001

    Fingerprint

    Artificial heart
    Artificial Heart
    Finite Element Analysis
    Durability
    Finite element method
    Fatigue
    Animals
    Blood
    Pumps
    Fatigue of materials
    Communication

    Keywords

    • Accelerated fatigue test
    • Artificial hearts
    • Durability
    • Finite element analysis
    • Fracture
    • Jellyfish valve
    • Mechanical strain
    • Polymer valve

    ASJC Scopus subject areas

    • Biophysics

    Cite this

    Design improvement of the Jellyfish valve for long-term use in artificial hearts. / Iwasaki, Kiyotaka; Umezu, Mitsuo; Imachi, K.; Iijima, K.; Fujimoto, T.

    In: International Journal of Artificial Organs, Vol. 24, No. 7, 2001, p. 463-469.

    Research output: Contribution to journalArticle

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