In accordance with an aspect of the invention, a medical device (1) is provided, the device for example being implantable into a human or animal body or being an augmentation device for strengthening human or animal hard tissue for subsequent implantation of a separate implant. The device comprises a sheath element 11 suitable of being brought into contact, during a surgical operation, with live hard tissue and/or with hard tissue replacement material. The sheath element has a for example generally elongate shape and a longitudinal bore (13) defining a longitudinal opening reaching from a proximal end of the sheath element into a distal direction, and a plurality of holes (14) in a wall of the opening. Further, the device comprises a liquefiable element (21) that is insertable or inserted in the longitudinal opening and at least partly liquefiable by the impact of energy impinging from the proximal side so that liquefied material flows through the holes (14) in the wall and out of the longitudinal opening into structures of the hard tissue and/or hard tissue replacement material. The medical device also comprises a directing structure that is structured angularly with respect to a longitudinal axis of the longitudinal opening to direct different portions of the liquefiable material to different ones of the holes.
