FIELD : medicine.SUBSTANCE : group of inventions relates to medical equipment, in particular, to a device for protecting an injury on the body of a living creature or a medical appliance applied to the body of a living creature, for example protecting against dirt and water. Medical device suitable for liquid proof shielding of a catheter application area on the body of a living creature comprises a base element and a top element. Base element has a deformable first side such that the base element is tightly placeable on a body area near the catheter application area, and a second side opposite the first side. Top element has a deformable first side connectable with the second side of the base element. One of the base element or the top element is an element comprising a slit for holding a catheter tube or infusion line and the other element comprises a protrusion for closing the slit and for forming a feedthrough for the catheter when the elements are connected. First portion of the element forming the slit and the protrusion are made of a first material and shaped for tightly fitting the catheter when it is in position. Element forming the slit or the protrusion comprises a second portion formed from a second material. Second material is more soft and deformable than the first material. Second portion is adjacent the first portion and is arranged so as to form a further liquid sealing element for the catheter. Use of said medical device for liquid proof shielding of a catheter application area on the body of a living creature. Use of said medical device for fixing the catheter on the body of a living creature.EFFECT : group of inventions provides improved tightness of the catheter application.20 cl, 17 dwg