The present invention is a urinary catheter structure improvement, mainly comprising a urethral tube in the tube system of the urinary catheter, and the urinary tube is provided with a stop ring on the diameter of the proximal branch end, and a tube sleeve is placed On the urethral tube inside the stop ring, the sputum can be used to collect the middle urine when the tube clamp is loosened, and the urinary tube can be stabilized and not detached when the tube clamp is clamped.本創作係一種導尿管結構改良，主要該導尿管的管體係分歧設有一採尿管，且該採尿管於近分歧端的管徑上擴設有擋止環，俾令一管夾套置於擋止環內側的採尿管上，俾可在管夾鬆放採尿管時採集中段尿進行檢驗，並在管夾夾固採尿管時達到穩固不脫落的目的。
