The<unk>  <unk>  is a device used to deliver supplemental oxygen or increased airflow to a patient or person in need of respiratory help. This device consists of a lightweight tube which on one end splits into two prongs which are placed in the nostrils and from which a mixture of air and oxygen flows. The other end of the tube is connected to an oxygen supply such as a portable oxygen generator, or a wall connection in a hospital via a flowmeter. The<unk>  is generally attached to the patient by way of the tube hooking around the patient's ears or by an elastic headband. The earliest, and most widely used form of adult<unk>  carries 1–3 litres of oxygen per minute.<unk> e with smaller prongs intended for infant or neonatal use can carry less than one litre per minute. Flow rates of up to 60 litres of air/oxygen per minute can be delivered through wider bore humidified<unk> . The<unk>  was invented by Wilfred Jones and patented in 1949 by his employer, BOC.
Nasal cannula
Venturi mask
Surgical mask
Nasal spray
Pocket mask
N95 respirator
Oxygen mask
Gas mask