Nasal cannulas are used to supply low-flow oxygen directly into the nostrils. They are commonly used in pulmonology OPDs, wards, and ICUs. Ideal for patients requiring long-term oxygen support. Used in chronic respiratory diseases like COPD. Lightweight and comfortable for extended use. Allows patients to eat and talk during therapy. Disposable cannulas reduce infection risk. Compatible with oxygen concentrators and cylinders. Available in adult and pediatric sizes. A basic but critical respiratory disposable.