To provide a kidney catheter capable of preventing the distal end portion of a kidney catheter from escaping from the renal pelvic cavity of the kidney even if the suture is removed from the kidney catheter or without bending the distal end portion of the kidney catheter I will provide a.A kidney catheter (3) includes a kidney catheter body (11) and a positioning member (15). The positioning member includes a collar portion 15a and a tubular portion 15b that can be fixed to the kidney. The relative movement between the intermediate portion and the positioning member is restricted by the contact frictional force between the intermediate portion and the cylindrical portion 15 b of the positioning member when the positioning member is fitted to the intermediate portion 11 b of the kidney catheter main body. The maximum value of the frictional force that can control the relative movement is larger than the assumed maximum value of the external force which acts when the kidney catheter is indwelling in the kidney and causes relative movement and can be given only by the hand of a person Is set to a value smaller than the value of the external force.(FIG.【課題】縫合糸を腎臓カテーテルから取り除いても、また、腎臓カテーテルの先端部を屈曲形成しなくても、腎臓カテーテルの先端部が腎臓の腎盂腔内から抜け出ないようにすることができる腎臓カテーテルを提供する。【解決手段】腎臓カテーテル3は、腎臓カテーテル本体11と位置決め部材15を備える。位置決め部材は、腎臓に固定可能な鍔部15aと筒部15bを備える。腎臓カテーテル本体の中間部11bに位置決め部材が嵌合されたときの、中間部と位置決め部材の筒部15bとの接触摩擦力により中間部と位置決め部材との相対移動が規制される。相対移動を規制し得る摩擦力の最大値は、腎臓カテーテルが腎臓に留置されているときに作用して相対移動を生じさせる外力の想定最大値より大きく、かつ、人の手のみにより付与可能な外力の値より小さい値に設定されている。【選択図】図1
