1954 Mueller Morch Piston Respirator
Dr. Ernst Tier Morch, a Danish physician, developed a piston respirator during WWII in Denmark. After he relocated to the USA following WWII, he continued work on his ventilator designs. V. Mueller Company of Chicago began manufacture of the Morch respirator in 1954. The unit was designed to fit under a hospital bed. The unit was introduced when the polio epidemic in the United States was still at its peak and provided an alternative to iron lungs.
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