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You should wash your cannula with soap and water at least twice a week, and replace it at least once a month. If you are sick with a cold or similar infection, you should replace your cannula immediately after feeling better.
Wear a cannula so that it causes a minimum of discomfort. The nasal cannula is a small piece of plastic tubing that is attached to a larger tube which, in turn, connects to the oxygen container. The cannula has two small prongs that are inserted into the nostrils. If the prongs are curved, they should point downward inside the nostrils.
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Why would you need to do that anyway? If you need the concentrated O2 that a mask provides, then a nasal cannula is not affective.
I've worked in hospitals and have always been taught that the nasal cannula should curve downwards. Cant give much justification as to why though..sorry!
Nasal Cannula
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Perforation of the nasal septum as a result of using a nasal cannula and non-humidified oxygen has been reported.
The nasal cannela was invented in the year 1949 by Wilfred jones. His employer patented it at that time and several different versions derive from the cannula contraption.
A nasal cannula is a devise used to deliver oxygen to a patient who needs respiratory help. The device consists of a tube with two prongs that are connected to the nostrils. Oxygen and air flow into these prongs into the nose.