Abstract: The invention relates to an activation tool (1) for a bone expansion apparatus (3), the bone expansion apparatus (3) being a distraction plate apparatus (3), the activation tool (1) comprising a magnetic element (130) solidly attached to a rotation shaft (120) of the activation tool (1), the magnetic element (130) being configured to interact coaxially with a distant magnetic element (310) borne by the bone expansion apparatus (3), the activation tool (1) being characterised in that it further comprises an electric motor (110) configured to cause the rotation shaft (120) to rotate, and a control module (140) controlling the rotation of the rotation shaft (120). The invention also relates to an assembly of a bone expansion apparatus (3) and of such an activation tool (1), in which the bone expansion apparatus (3) is a distraction plate apparatus (3).

Abstract: The invention relates to a plate distractor, particularly a maxillofacial plate distractor, comprising a first (12) and a second (14) fixing plate, a threaded pin (24) mounted in a freely rotatable and translatably fixed manner in relation to the first fixing plate (14), a screwed tube (26) fixed to the second fixing plate (12), a permanent magnet (20) extending in a main direction, which is magnetised transversely to the main direction and mounted in the plate distractor (10) such that the rotation of the magnet (20) on itself, about an axis of rotation (D) parallel to the main axis, causes a relative rotation of the threaded pin (24) in relation to the screwed tube (26), the magnet (20) being arranged close to one of the ends of the plate distractor (10).

Abstract: The invention relates to a plate distractor, particularly a maxillofacial plate distractor, comprising a first (12) and a second (14) fixing plate, a threaded pin (24) mounted in a freely rotatable and translatably fixed manner in relation to the first fixing plate (14), a screwed tube (26) fixed to the second fixing plate (12), a permanent magnet (20) extending in a main direction, which is magnetised transversely to the main direction and mounted in the plate distractor (10) such that the rotation of the magnet (20) on itself, about an axis of rotation (D) parallel to the main axis, causes a relative rotation of the threaded pin (24) in relation to the screwed tube (26), the magnet (20) being arranged close to one of the ends of the plate distractor (10).