A<unk>  (NPV) is a type of mechanical<unk>  that stimulates an ill person's breathing by periodically applying<unk>  air<unk>  to their body to expand and contract the chest cavity.
Negative pressure ventilator
Mechanical ventilation
Artificial ventilation
Elastomeric respirator
Pressure support ventilation
Positive airway pressure
Non-invasive ventilation
Airway pressure release ventilation