Early ICU Ventilators
An overview of the early generations of ICU ventilators from the 1950s – 1979.
The ventilator provided a constant stroke volume up to 3600 mL directly to an uncuffed tracheostomy tube. It was the first ventilator to incorporate a humidifier
The respirator was recommended for use with uncuffed trach tubes.
Intermittent mandatory ventilation was introduced in the 1970s almost a decade after the MA-1 was released. Therapists adapted the MA-1 to allow IMV through "home-made" modifications as shown here.
The MA-1, PEEP valve, spirometer, condensation trap and cascade humidifier are shown.