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Related Experiment Videos

Roller screw electric motor ventricular assist device.

W E Richenbacher, W E Pae, J A Magovern

    ASAIO Transactions
    |July 1, 1986
    PubMed
    Summary

    A new roller screw electric ventricular assist device (VAD) is lighter, easier to make, and shows durable performance in vivo. This VAD pumps blood efficiently with minimal hemolysis and stable pressure.

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    Area of Science:

    • Biomedical Engineering
    • Medical Devices
    • Cardiovascular Technology

    Background:

    • Current ventricular assist devices (VADs) face challenges in manufacturing complexity, weight, and long-term durability.
    • The drum cam VAD model presented limitations that necessitated further development in VAD technology.

    Purpose of the Study:

    • To introduce and evaluate a novel roller screw electric VAD.
    • To assess the manufacturability, weight, efficiency, hemocompatibility, and in vivo durability of the new VAD design.

    Main Methods:

    • Manufacturing process analysis comparing the roller screw electric VAD to the drum cam model.
    • Performance testing to determine power requirements, flow rates, and hemolysis levels.
    • In vivo testing of the motor drive for durability over extended periods.
    • Analysis of compliance chamber volume variations and pressure dynamics.
    • Investigation of compliance chamber volume loss attributed to gas transport.

    Main Results:

    • The roller screw electric VAD is easier to manufacture and 25% lighter than the drum cam model.
    • The device operates at 12-15 W, delivering 6-8 L/min with minimal hemolysis.
    • The motor drive demonstrated in vivo functionality for up to 93 days with no measurable wear.
    • Compliance chamber volume varied by 100 cc during VAD function, with pressure variations below 15 mmHg.
    • A daily compliance chamber volume loss of 2-5 cc was observed, attributed to gas transport through the SPU (single-use plastic).

    Conclusions:

    • The roller screw electric VAD offers significant advantages in manufacturability and weight.
    • The device exhibits promising hemocompatibility, efficiency, and durability for VAD applications.
    • The design incorporates features like a subcutaneous sampling port for system access and monitoring.

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