A nasal cannula is a medical device used to deliver supplemental oxygen to patients who have difficulty breathing. The cannula is a small, flexible tube that is inserted into the nostrils of the patient. It is commonly used in hospitals, nursing homes, and other medical settings.

Nasal cannulas are classified as low-flow oxygen delivery devices. They are designed to deliver oxygen at a rate of 1-6 liters per minute. The low-flow rate is intended to provide a constant flow of oxygen to the patient, without causing discomfort or irritation.

The use of a nasal cannula is relatively simple. The device is connected to an oxygen source, such as an oxygen tank or oxygen concentrator. The two prongs of the cannula are inserted into the nostrils, and the oxygen flow is adjusted to the prescribed level. Patients may wear the cannula for extended periods of time, as needed.

Overall, the nasal cannula is a safe and effective means of delivering supplemental oxygen to patients in need. It is a widely used medical device that has helped countless individuals breathe easier and live healthier lives.