A kind of catheter include a main pipe,One drain side,One dispensing end and a bending fixing piece,The main pipe have a front end,One end,One exhaust chamber and an injecting cavity,The end has an opening and a bulge,The open communication exhaust chamber,The bulge is connected to the injecting cavity,The drain side connects the front end of the what main pipe,The drain side has an apocenosis passage,The apocenosis passage is connected to the opening via the exhaust chamber,The dispensing end connects the front end of the what main pipe,The dispensing end has an injection canal,The injection canal is connected to the bulge via the injecting cavity,One of what drain side outer surface is arranged in the bending fixing piece,The bending fixing piece to bend and keep what bending state,Constantly to block the apocenosis passage of the drain side.一種導尿管包含一主導管、一排液端、一注射端及一彎折固定件，該主導管具有一前端、一末端、一排液腔及一注射腔，該末端具有一開口及一膨脹部，該開口連通該排液腔，該膨脹部連通該注射腔，該排液端連接於該主導管之該前端，該排液端具有一排液通道，該排液通道經由該排液腔連通該開口，該注射端連接於該主導管之該前端，該注射端具有一注射通道，該注射通道經由該注射腔連通該膨脹部，該彎折固定件設置於該排液端之一外表面，該彎折固定件用以彎折並保持於彎折狀態，以持續地阻斷該排液端之該排液通道。
