Children mask Venturi
The venturi mask, also known as an air-entrainment mask, is a medical device to deliver a known oxygen concentration to patients on controlled oxygen therapy. Venturi masks are considered high-flow oxygen therapy devices. This is because venturi masks are able to provide total inspiratory flow at a specified FIO2 to patients therapy.
After gas is forced through the Venturi valve, the pressure drops suddenly due to the increase in area. The velocity or flow of the gas increases as a result, and air is entrained from either side of the valve. Venturi masks come with different sized colour coded valves. Each requires a certain gas flow to deliver the oxygen concentration stated. To change the oxygen concentration, you have to change the mask and flow. By delivering a constant mixture of oxygen and air at above the maximum inspiratory flow rate, changes in breathing do not affect the oxygen concentration delivered.
