A protective storage capsule is disclosed for a nasal cannula. The protective storage capsule may be used in conjunction with a nasal cannula assembly. The protective storage capsule includes a housing adapted to receive the nasal cannula and a cap to cover and protect the nasal cannula from dirt and debris when not being worn by a patient. The protective storage capsule slides along one or more of the support tubes of the nasal cannula assembly. The surfaces of the protective storage capsule may be treated with an antimicrobial film or be infused with antimicrobial nanoparticles.
