A catheter structure includes a main catheter body and a LED device. The main catheter body extends through a human ureter and the LED device including a plurality of LEDs is arranged on the main catheter body. When the LED device is turned on, lights of the LED device indicates a position of the main catheter body. In another embodiment, the catheter structure includes a main catheter body, a resilient conduit and a LED device. The resilient conduit is provided on the main catheter body and is operated to expand and shrink the main catheter body. An air-pumping device connects with the resilient conduit for generating an air-pressure difference therein. When the air-pumping device generates the air-pressure difference in the resilient conduit, the main catheter body is expanded and shrunk to indicate its position.一種導尿管構造包含一主管體及一LED裝置。該主管體用以穿入至一輸尿管,而該LED裝置設置於該主管體上,且該LED裝置包含數個LED單元。當該LED單元發出一光線時,該LED裝置之光線可顯示該輸尿管之位置。本發明另一實施例之該導尿管構造包含一主管體、一彈性輸氣管及一LED裝置。該彈性輸氣管設置於該主管體上,且該彈性輸氣管可彈性收縮。一輸氣裝置連接於該彈性輸氣管,且該輸氣裝置輸出一氣體壓力差至該彈性輸氣管。當該輸氣裝置輸出該氣體壓力差至該彈性輸氣管時,該彈性輸氣管產生彈性膨脹及收縮,以便顯示該輸尿管之位置。1‧‧‧主管體2‧‧‧LED裝置3‧‧‧控制單元5‧‧‧膀胱6‧‧‧輸尿管7‧‧‧腎臟
