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Portable Emergency Ventilators: Sensitivity to Environment
Author(s) -
Dahlgren B.E.,
Engdahl O.,
Nilsson H.
Publication year - 1981
Publication title -
acta anaesthesiologica scandinavica
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.738
H-Index - 107
eISSN - 1399-6576
pISSN - 0001-5172
DOI - 10.1111/j.1399-6576.1981.tb01604.x
Subject(s) - medicine , sensitivity (control systems) , shock (circulatory) , vibration , mechanical ventilator , pulmonary function testing , anesthesia , acoustics , mechanical ventilation , physics , engineering , electronic engineering
The function in various types of climate of three ventilators which are commercially available in Sweden: Motivus®, Pneupac® 2 and Logic 07®, was tested as well as their sensitivity to vibration. The ventilators functioned in subzero temperatures only if the driving gas had a low humidity content. They also required an increased driving gas pressure. Only Logic 07 would function below — 20°C In a hot climate there were no functional disturbances. Motivus and Pneupac 2 had few resonance frequencies during the vibration tests. Logic 07 had a very marked resonance frequency at 60 Hz, as well as in other ranges, which disturbed the ventilatory function since the vibration affected the ventilatory frequency regulator. All three ventilators functioned without any complaints after being subjected to vibration tests for at least 15 min at the observed resonance frequencies, or to shock tests. The results suggest that a thorough scrutiny should be carried out of the function of compact ventilators in various environments.