A collapsible nasal ejecting catheter, made of thermoplastic elastomer or other soft and elastic material, can be operated by the patients to insert into their nasal cavity and nasopharynx. The catheter includes a catheter body and a connector. The catheter has a flat closed distal end, a transitional segment starting from the closed end to a circular appearance, a normal segment having a circular appearance, and an open end on the opposite side of the flat closed end. There are multiple side-holes near the closed end. This catheter, when adapted to a connector and further connected to a syringe, can eject multiple strong thin spouts within the nasal cavity and nasopharynx for cleansing mucus and crust. The maximum width of the transitional segment is not less than 1 mm, and the minimum wall thickness of the catheter is not larger than 0.45 mm. Due to the flat closed distal end and transitional segment of the catheter body and its flexibility, the catheter with a larger outer diameter can be smoothly inserted into the slit-like space, reaching a deep depth to produce a better flushing efficiency, and also avoiding accidental entry into the sinus.
