Types of Ventilator

Positive Pressure Ventilators
Gas blown into lungs
All Current Itu and Theatre Ventilators
Unphysiological but practical
Negative Pressure Ventilators
“Iron Lung”
Cuirass (breastplate) ventilators
Physiological but impractical


Origins of mechanical ventilation


Negative-pressure ventilators (“iron lungs”)
Non-invasive ventilation first used in Boston Children’s Hospital in 1928
Used extensively during polio outbreaks in 1940s – 1950s
Positive-pressure ventilators
Invasive ventilation first used at Massachusetts General Hospital in 1955
Now the modern standard of mechanical ventilation
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