Design: The non-rebreather bag consists of a mask that covers the patient's nose and mouth, along with a reservoir bag attached to the mask. The mask is typically made of soft, flexible materials and has an adjustable strap to secure it in place.

The reservoir bag is made of transparent material and is used to temporarily store oxygen.

One-Way Valve: The non-rebreather mask has a one-way valve and an attached oxygen source, such as an oxygen cylinder or wall outlet. The one-way valve allows oxygen to flow from the source into the mask and reservoir bag, but prevents the patient from inhaling exhaled air or room air.

Oxygen Delivery: When the patient inhales, the one-way valve opens, allowing oxygen from the reservoir bag to be inhaled. During exhalation, the valve closes, preventing the patient from rebreathing exhaled air. This helps ensure that the patient receives a high concentration of oxygen with each breath.

Adjustable Oxygen Flow: The oxygen flow rate can be adjusted based on the patient's oxygen requirements and prescribed therapy. The flow rate is typically set at a level that ensures the reservoir bag remains inflated during inhalation.

Safety Considerations: Healthcare professionals closely monitor the patient's oxygen saturation levels and adjust the oxygen flow rate as needed. The non-rebreather bag should be properly fitted and positioned on the patient's face to ensure effective oxygen delivery and minimize the risk of oxygen leakage.