The present invention relates to a urinary catheter, and more particularly, a hollow drainage tube (10) having a urine discharge passage for discharging urine formed at the center thereof and having a double tube structure； A urine inlet (11) formed with a plurality of penetrating ends of the drainage tube (10) to enter the bladder so that urine flows into the drainage tube (10)； A urine outlet 13 provided on the opposite side of the urine inlet 11 so that urine introduced into the urine inlet 11 is discharged through the drainage tube 10； A fluid inlet 14 provided at the front end of the catheter unit on one side of the urine discharge port 13 to enter the fluid through the fluid passage formed at the outer circumference of the drainage pipe of the double pipe structure； A balloon (balloon, 30) provided at the end outer periphery of the drainage tube so as to swell by the injection pressure of the fluid injected into the fluid inlet 14 so that the distal end of the drainage tube 10 located inside the bladder does not exit the urethra； Including, but when the external force is applied to force the catheter from the outside of the body in the expanded state of the balloon 30 is actuated by the contact pressure generated while contacting the urine outlet 40 or the pressing force according to the fluid movement inside the balloon The inflated balloon is expelled and the fluid is discharged so that the inflated state of the balloon is released to the outer periphery of the balloon 30 or the contact portion of the balloon 30 and the drainage tube 10 is formed in a configuration that is formed.본 발명은 요로 카테터에 관한 것으로, 더욱 상세하게는 소변을 배출시키기 위한 소변배출로가 중심부에 형성되어 이중관 구조로 이루어지는 중공형의 배액관(10)； 상기 배액관(10) 내부로 소변이 유입되도록 방광 내부로 진입하는 배액관(10)의 말단부에 복수개가 관통 형성된 소변유입구(11)； 상기 소변유입구(11)로 유입된 소변이 배액관(10)을 통과하여 배출되도록 상기 소변유입구(11)의 반대쪽에 구비되는 소변배출구(13)； 이중관 구조의 배액관 외주연에 형성된 유체통로를 통해 유체를 진입시키도록 상기 소변배출구(13)의 일측 카테터유닛의 선단부에 구비되는 유체주입구(14)； 방광 내부에 위치한 상기 배액관(10)의 말단부가 요도로 빠져 나가지 않도록 상기 유체주입구(14)로 주입
