Abstract: In a device for fixing subcutaneous catheters connected predominantly to a so-called open, or partially implantable system, in which a catheter is connected to a venous port, a peridural space, or other parts of a human body, the catheter is situated outside a subcutaneous pocket and introduced into a relative subcutaneous tunnel. The device includes a disc or a cylinder, which is introduced in said subcutaneous pocket and which features, made therein, at least three tubular through cavities, first, second and third, respectively. The three tubular cavities do not intersect. The catheter is introduced into the three tubular cavities.