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Portable emergency ventilators. Sensitivity to environment

B E Dahlgren, O Engdahl, H Nilsson

    Acta Anaesthesiologica Scandinavica
    |February 1, 1981
    PubMed
    Summary
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    Commercial ventilators (Motivus, Pneupac 2, Logic 07) showed varied performance in extreme climates and vibration. Logic 07 performed best in cold, but all ventilators require scrutiny for diverse environmental use.

    Area of Science:

    • Mechanical Engineering
    • Environmental Science
    • Medical Devices

    Background:

    • Commercial ventilators are crucial for patient respiratory support.
    • Understanding their performance in diverse environmental conditions is vital for reliable operation.
    • Previous research has not comprehensively evaluated compact ventilator function across various climates and vibration exposures.

    Purpose of the Study:

    • To assess the functional performance of three commercially available ventilators (Motivus, Pneupac 2, Logic 07) in different climatic conditions (cold and hot).
    • To evaluate the sensitivity of these ventilators to mechanical vibration and shock.
    • To determine the suitability of these ventilators for use in varied environmental settings.

    Main Methods:

    • Testing of three ventilator models (Motivus, Pneupac 2, Logic 07) in simulated subzero and hot climates.

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  • Assessment of ventilator function under varying driving gas humidity and pressure.
  • Exposure of ventilators to vibration tests, including resonance frequencies and shock tests.
  • Monitoring of ventilatory function and frequency regulator response during vibration exposure.

    • Main Results:

    • Ventilator function in subzero temperatures required low humidity driving gas and increased pressure; only Logic 07 operated below -20°C.
    • No functional disturbances were observed in hot climate conditions.
    • Motivus and Pneupac 2 exhibited few resonance frequencies; Logic 07 had a significant resonance at 60 Hz affecting ventilatory frequency regulation.
    • All ventilators withstood prolonged vibration and shock tests without functional complaints.

    Conclusions:

    • Compact ventilators exhibit performance limitations in extreme cold, necessitating specific operational adjustments.
    • Vibration can significantly impact the function of certain ventilators, particularly affecting their frequency regulation mechanisms.
    • Despite initial challenges with vibration, all tested ventilators demonstrated resilience after exposure, suggesting a need for thorough environmental performance scrutiny before deployment.