Adjustable catheter

The utility model discloses a catheter capable of being regulated and controlled. The adjustable catheter comprises an outer sheath tube and an inner catheter arranged in the outer sheath tube in a penetrating mode, the initial end and the tail end of the inner catheter are provided with an imbedding part and an operation part respectively, the diameter of a port of the imbedding part is larger than the pipe diameter of the inner catheter, and the imbedding part can stretch out of the initial end of the outer sheath tube to be opened. And the operation part extends out of the tail end of the outer sheath tube. When the adjustable catheter disclosed by the utility model is used, a guide wire can be firstly penetrated into the inner catheter, then the outer sheath tube is placed into an operation area of a patient in an operation, the end openings of the placement parts of the inner catheter and the X inner catheter are pushed to be opened at the initial end of the outer sheath tube, and the guide wire is pushe