Automated fabrication of polyurethane heart valves

K. Uchiyama, N. Fujisawa, Y. Shimazaki, M. Ranawake, T. Fujimoto, Mitsuo Umezu

    Research output: Contribution to journalArticle

    3 Citations (Scopus)

    Abstract

    We have developed an automated 'Arm Robot' Fabrication System (ARFS) to make the leaflets of a polyurethane (PU) valve for use in ventricular assist devices (VAD). Preliminary testing using the ARFS resulted in a 27% success rate of the valves fabricated, as compared to 50% for the hand made valves. To gain a better understanding of the deviations in thickness of the leaflet, we measured it at a 135 different points using a Miniature moire measuring system. Of the ARFS made valves, the max. deviation between the three leaflets was at 25μm. and 47μm. for the hand made valves, while the leaflet itself became thicker towards the base. This result indicated a much more even thickness distribution in the ARFS made valves. From valve fatigue testing and using the FEM (finite element method) it was evident a thickness of approximately 300μm. at the base of the leaflet is necessary to achieve long term durability. Although problems remain the ARFS, as the thickness of the valve is better controlled using this system, it is reasonable to assume parameters of valve performance including durability, leakage and pressure drop are also better controlled.

    Original languageEnglish
    Pages (from-to)124-129
    Number of pages6
    JournalJapanese Journal of Artificial Organs
    Volume23
    Issue number1
    Publication statusPublished - 1994

    Fingerprint

    Polyurethanes
    Heart Valves
    Arm
    Hand
    Heart-Assist Devices
    Fatigue
    Pressure

    ASJC Scopus subject areas

    • Biophysics

    Cite this

    Uchiyama, K., Fujisawa, N., Shimazaki, Y., Ranawake, M., Fujimoto, T., & Umezu, M. (1994). Automated fabrication of polyurethane heart valves. Japanese Journal of Artificial Organs, 23(1), 124-129.

    Automated fabrication of polyurethane heart valves. / Uchiyama, K.; Fujisawa, N.; Shimazaki, Y.; Ranawake, M.; Fujimoto, T.; Umezu, Mitsuo.

    In: Japanese Journal of Artificial Organs, Vol. 23, No. 1, 1994, p. 124-129.

    Research output: Contribution to journalArticle

    Uchiyama, K, Fujisawa, N, Shimazaki, Y, Ranawake, M, Fujimoto, T & Umezu, M 1994, 'Automated fabrication of polyurethane heart valves', Japanese Journal of Artificial Organs, vol. 23, no. 1, pp. 124-129.
    Uchiyama K, Fujisawa N, Shimazaki Y, Ranawake M, Fujimoto T, Umezu M. Automated fabrication of polyurethane heart valves. Japanese Journal of Artificial Organs. 1994;23(1):124-129.
    Uchiyama, K. ; Fujisawa, N. ; Shimazaki, Y. ; Ranawake, M. ; Fujimoto, T. ; Umezu, Mitsuo. / Automated fabrication of polyurethane heart valves. In: Japanese Journal of Artificial Organs. 1994 ; Vol. 23, No. 1. pp. 124-129.
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