A medical Ventilator is a machine that helps your lungs work. It can be a lifesaving machine if you have a condition that makes it hard for you to breathe properly or when you can’t breathe on your own at all. A ventilator helps to push air in and out of your lungs so your body can get the oxygen it needs. You may wear a fitted mask to help get oxygen from the ventilator into your lungs. Or, if your condition is more serious, a breathing tube may be inserted down your throat to supply your lungs with oxygen. Ventilators are most often used in hospital settings. A doctor or a respiratory therapist will control how much oxygen is pushed into your lungs by the ventilator.