A medical device (1), comprising a sheath element (11) suitable for contact, during a surgical operation, with a living hard tissue and / or with a hard tissue replacement material, in which the element of sheath has a longitudinal hole defining a longitudinal opening (13) extending from a proximal end of the sheath element to a distal direction, and a plurality of holes (14) in a wall of the opening, in which the device it further comprises a liquefiable element (21) that is insertable or inserted into the longitudinal opening and is at least partially liquefiable by the impact of incident energy from the proximal side so that the liquefied material flows through the holes in the wall and outside the longitudinal opening into the structures of the hard tissue and / or the hard tissue replacement material, characterized in that the medical device further comprises: - a first surface d e distal stop, against which a distal end of the liquefiable element can be pressed during the liquefaction, in which the first distal stop surface is in a first position, and - an insertion element (8) comprising a second surface of distal stop, in which the insertion element can be inserted from a side proximal to the interior of the longitudinal opening and is shaped to be stopped in a position where the second distal stop surface is in a second position, different from the first position.Un dispositivo (1) médico, que comprende un elemento (11) de vaina adecuado para ser puesto en contacto, durante una operación quirúrgica, con un tejido duro vivo y/o con un material de sustitución de tejido duro, en el que el elemento de vaina tiene un agujero longitudinal que define una abertura (13) longitudinal que se extiende desde un extremo proximal del elemento de vaina a una dirección distal, y una pluralidad de orificios (14) en una pared de la abertura, en el que el dispositivo comprende además un elemento (21) licuable que es insertable o es insertado en la abertura longitudinal y es al
