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The monostrut strength.

V O Björk, D Lindblom, A Henze

    Scandinavian Journal of Thoracic and Cardiovascular Surgery
    |January 1, 1985
    PubMed
    Summary
    This summary is machine-generated.

    The monostrut Björk-Shiley (B-S) valve, made from a single piece of Haynes 25, ensures a stable fatigue endurance limit. This design prevents strut fractures under physiological and extreme conditions, enhancing valve safety.

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    Area of Science:

    • Biomaterials Engineering
    • Mechanical Engineering
    • Cardiovascular Devices

    Background:

    • The Björk-Shiley (B-S) valve historically used Haynes 25, with a fatigue endurance limit of 4900 kg/cm² (70000 psi).
    • Welded struts in earlier B-S valves exhibited fatigue limit variations due to incomplete welds and phase segregation, posing a risk.

    Purpose of the Study:

    • To introduce and evaluate the novel monostrut design for the Björk-Shiley valve.
    • To confirm the enhanced fatigue endurance and safety of the monostrut design compared to previous welded struts.

    Main Methods:

    • The monostrut valve is fabricated from a single piece of Haynes 25 using electrochemical machining.
    • Testing was conducted in a pulse duplicator simulating physiological conditions (120 pulses/min, 200 mmHg peak ventricular pressure).

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  • In-service tensile stresses on the 29 mm outflow strut were measured.

    • Main Results:

    • The monostrut design achieves a stable fatigue endurance limit of 4900 kg/cm² (70000 psi) due to its homogenous structure.
    • Maximum in-service tensile stresses were measured at 700 kg/cm² (9800 psi), indicating a sevenfold safety margin.
    • Struts demonstrated resistance to fracture under extreme experimental conditions and were safe under peak physiological conditions.

    Conclusions:

    • The monostrut design eliminates variations in fatigue endurance limit associated with welded struts.
    • The enhanced safety margin and fracture resistance of the monostrut valve significantly improve device reliability.
    • This design advancement ensures the integrity of Björk-Shiley valve struts under all physiological and extreme stress conditions.