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The Ejector Flowmeter and Its Clinical Application
Author(s) -
Jørgensen S.
Publication year - 1974
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.1399-6576.1974.tb00696.x
Subject(s) - injector , flow measurement , nozzle , medicine , compressed air , tube (container) , anesthesia , mechanics , mechanical engineering , engineering , physics
The ejector flowmeter is designed for the quantitative removal of excess anaesthetic gases. By passing compressed air or gas at 2.0‐3.5 kg/cm 2 pressure through a narrow injector nozzle across the upper end of an ordinary flowmeter tube, a sufficient vacuum is created in the flowmeter to obtain an adjustable removal of gas through the flowmeter; for instance, an anaesthetic gas mixture. The driving gas conveys the anaesthetic gas mixture through a narrow antistatic rubber tube to the nearest ventilation channel or along the floor or ceiling into fresh air through an opening in an outer wall. The ejector flowmeter may be mounted on any anaesthetic machine, being independent of national standard dimensions. It can be attached to all current anaesthetic circuits, including those with an anaesthesia ventilator. The float secures visual control of proper flowmeter function. The evacuation capacity is adjustable up to 15 1/min, and the full capacity is 20‐25 1/min. The consumption of driving gas is about 6 1/min. This elimination of gas involves no explosion risk.