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Controlled ventilation using the Lack circuit with an injector device.

N D Hopkinson, M J Harrison

    Acta Anaesthesiologica Scandinavica
    |August 1, 1984
    PubMed
    Summary
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    This study introduces a novel breathing system for controlled ventilation, effectively maintaining target end-tidal carbon dioxide levels in patients during surgery. The system demonstrated no rebreathing in lung models and clinical trials.

    Area of Science:

    • Anesthesiology
    • Respiratory Physiology
    • Medical Device Engineering

    Background:

    • Controlled ventilation is crucial in anesthesia.
    • Existing breathing systems may have limitations in precise gas delivery and rebreathing prevention.
    • Injector devices offer potential for improved control in respiratory circuits.

    Purpose of the Study:

    • To evaluate a novel Lack breathing system incorporating an injector device for controlled ventilation.
    • To assess the system's efficacy in preventing rebreathing.
    • To determine the system's ability to maintain target end-tidal carbon dioxide levels in surgical patients.

    Main Methods:

    • The Lack breathing system with an injector device was tested on two model lungs.
    • Oxygen was delivered via the injector device, positioned between the Lack circuit and catheter mount.

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  • Nitrous oxide was supplied from the anesthetic machine.
  • The system was subsequently studied in ten patients undergoing surgery.

    • Main Results:

    • Satisfactory tidal volumes were achieved in lung model testing.
    • No rebreathing was detected at fresh gas flow rates of approximately 4 L/min.
    • An end-tidal carbon dioxide concentration of 5-6% was successfully maintained in surgical patients.

    Conclusions:

    • The Lack breathing system with an injector device is effective for controlled ventilation.
    • The system prevents rebreathing and allows for maintenance of target end-tidal carbon dioxide levels.
    • This system shows promise for use during general anesthesia.