Which oxygen delivery device typically uses a reservoir bag filled with oxygen?

• A. Nasal Cannula
• B. Simple Mask
• C. Non-Rebreather Mask
• D. Oxygen Concentrator

Answer: (C)

The non-rebreather mask is designed specifically for delivering high concentrations of oxygen. This device typically features a reservoir bag that fills with oxygen, providing a source of supplemental oxygen for the patient. The purpose of the reservoir bag is to ensure that a sufficient amount of oxygen is available for inhalation, allowing the patient to breathe in pure oxygen while minimizing the intake of ambient air. The mask has one-way valves that prevent the exhaled air from re-entering the bag, enabling the patient to receive nearly 100% oxygen during inhalation.

In contrast, the other devices mentioned do not utilize a reservoir bag. The nasal cannula delivers oxygen directly into the nostrils but allows room air to mix with the oxygen. The simple mask, while it covers the mouth and nose, does not have a reservoir bag and delivers a lower concentration of oxygen compared to the non-rebreather mask. An oxygen concentrator serves to extract oxygen from ambient air and does not involve a mask or reservoir bag; it provides a continuous flow of oxygen but not in the concentrated manner that a non-rebreather mask does. Thus, the non-rebreather mask is characterized by its use of a reservoir bag, making it the correct answer.