Oxygen Delivering System II: Venturi Mask and Transtracheal Oxygen

The venturi mask comprises a large tube with an oxygen inlet that narrows down, creating a pressure drop that pulls air through side ports. The mask can be adjusted to deliver the desired oxygen concentration.

The advantage of venturi masks is that they precisely control the oxygen concentration FiO2, ranging from 24% to 60%. They can also add humidity, allowing the patient to talk, although with a muffled voice.

The drawback is that they need to be removed for eating, which can be uncomfortable for the patient.

Alternatively, a transtracheal oxygen catheter is a small tube inserted into the trachea under local anesthesia. It is attached to the neck with an elastic strap and then connected to the oxygen source.

The advantages include improved patient mobility, comfort, appearance, and lower cost compared to other delivery systems. They do not interfere with talking or eating.

The drawbacks include oxygen concentration loss from a loose collar fit, frequent cleaning, and infection risk at the tracheostomy site.