The iron lung, also known as the Drinker respirator, is a monumental achievement in medical history. Developed in 1928 by American industrial hygienist Philip Drinker and his colleague Louis Agassiz Shaw at Harvard University, the device served as the first reliable mechanical life-support system, sustaining the lives of thousands of patients during the polio epidemics of the early to mid-20th century.

The Role of the Vacuum Cleaner

A striking detail in the history of this innovation is its humble origin. While attempting to design a machine to resuscitate victims of industrial accidents—such as gas poisoning or electrocution—Drinker sought an effective way to create artificial respiration. According to historical accounts, his early prototype was built using a wooden box and a simple motor-driven pump mechanism fashioned from two salvaged vacuum cleaner motors. These motors were used to drive a bellows system that created the necessary pressure changes, proving that even mundane household technology could be repurposed for life-saving medical advancement.

How the Iron Lung Saved Lives

The iron lung functioned through a process known as external negative pressure ventilation.

Science Museum

• Mechanism: A patient with respiratory paralysis—a common, life-threatening symptom of polio—was sealed into an airtight metal chamber with only their head exposed. The vacuum cleaner-powered bellows would rhythmically withdraw air from the chamber, creating a partial vacuum (negative pressure). YouTube+ 1
• Respiratory Support: This drop in pressure inside the tank forced the patient’s chest to expand, which in turn drew air into the lungs. When the bellows reversed the pressure, the chest would deflate, allowing for exhalation. Science Museum
• Impact: By automating the breathing process, the machine provided immediate relief to patients who were otherwise suffocating due to the paralysis of their diaphragm and chest muscles. YouTube

The machine was first successfully used at Boston Children’s Hospital in 1928, where it famously saved an eight-year-old girl on the brink of death. For the next three decades, until the arrival of the Salk and Sabin vaccines and the development of modern positive-pressure ventilators, the iron lung was a standard fixture in hospital wards worldwide. It not only saved thousands of lives but also established the foundations of modern critical care medicine, proving that machines could effectively take over the most vital human functions.

This video provides a clear visual explanation of how the iron lung’s pressure-based mechanism effectively mimicked human breathing to save lives.