An implantation tool (2) for implanting a totally implantable device (1) in the body of a human or animal, comprising an axially hollow needle (13) connected to a supply conduit (16) for a fluid injectable from said needle (13) for the creation of a tissue swelling (4), into which said device (1) is introducible, a longitudinal containment body (6) having inside it an axial cavity along which the needle (13) is slidingly guided, and a pulling element (11) disengageably engaged to said containment body (6) for drawing and releasing said device (1) in said tissue swelling (4).
