The Iron Lung
An iron lung is a machine that enables a person to breathe when normal muscle control has been lost or the work of breathing exceeds the person's ability. It is a form of medical ventilator. Properly, it is called a negative pressure ventilator.
This Machine founded in the middle of 1900s, Used in manegment of victims of poliomyelitis to help them to survive.
"Will be discussed later"
As we know "or we will know", polio virus causes damage in the AHC "Anterior Hron Cells" which are responsible about motor movements of our muscles.
If the AHC of the Respiratofy muscles affected, the patients become unable to breathe
These mesirable patients were placed in these steel chambers to survive.
The iron lung "as we see in the above photo" is a a cylindrical steel drum. A door allowing the head and neck to remain free is then closed, forming a sealed, air-tight compartment enclosing the rest of the person's body. Pumps that control airflow periodically decrease and increase the air pressure within the chamber, and particularly, on the chest.