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The bird Mark 8 time cycled servo ventilator.

D C Milburn, M J Banner, J M Civetta

    Critical Care Medicine
    |May 1, 1978
    PubMed
    Summary
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    A modified Bird Mark 8 ventilator offers inexpensive, high-pressure mechanical ventilation, including advanced intermittent mandatory ventilation (IMV) and positive end-expiratory pressure (PEEP) capabilities. This versatile, pneumatically powered system has proven reliable in over 100 patients.

    Area of Science:

    • Biomedical Engineering
    • Respiratory Therapy
    • Medical Device Innovation

    Background:

    • Commercial ventilators often lack the high peak pressure and specific therapy capabilities required for certain patient needs.
    • Existing equipment may not be suitable for transport or operating room use due to power requirements.

    Purpose of the Study:

    • To modify a Bird Mark 8 ventilator to provide inexpensive, high-peak pressure capabilities.
    • To enable delivery of advanced intermittent mandatory ventilation (IMV) and positive end-expiratory pressure (PEEP) therapy.
    • To create a versatile and reliable ventilatory support system suitable for various clinical settings.

    Main Methods:

    • Modification of a Bird Mark 8 ventilator using a time-cycled servo mechanism.
    • Integration of capabilities for adjustable IMV rates (1-60/min) and tidal volumes (0.1-2 L).

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  • Development of high inspiratory pressure generation (>200 torr) and PEEP capabilities (1-25 torr).

    • Main Results:

    • The modified ventilator achieved high peak inspiratory pressures and adjustable PEEP levels exceeding typical commercial offerings.
    • The system demonstrated versatility with variable IMV rates and tidal volumes.
    • The pneumatically powered design facilitates use in transport and operating rooms.
    • Modifications cost approximately $750.00.
    • Successful clinical application in over 100 patients.

    Conclusions:

    • An inexpensive, reliable, and versatile ventilatory support system with high peak pressure capabilities has been developed.
    • The modified Bird Mark 8 ventilator effectively delivers advanced IMV-PEEP therapy.
    • The system's pneumatic power source enhances its utility in diverse clinical environments.