A fusion device for the fusion of a joint of a human or animal patient, in which the joint is a synovial joint comprising two articular surfaces and an opening between them, the fusion device comprising: at least two anchoring parts ( 1) and at least one stabilization part (2), in which the fusion device has a total depth (D) parallel to the direction of implantation (I), the total depth extending from a proximal face (4) to a distal end of the fusion device, a total width (W) and a thickness profile (T1 and T2) perpendicular to the direction of implantation (I), in which the anchoring parts (1) and the stabilization part (2 ) are arranged alternately along the width (W) by the fact that the stabilization part (2) is arranged between the anchoring parts (1), and in which the part (s) anchor have a thickness (T1) that is greater than the thickness (T2) of the stabilization part (s), wherein at least one anchoring part (1) comprises a liquefiable thermoplastic material that is disposed on a surface of the anchoring part (1) or inside a sheath perforated (52) constituting a part of the anchoring part (1), wherein said surface of the anchoring part (1) or said perforated sheath (52) is arranged in the fusion device to be in contact with the bone tissue in the implant, and in which the two anchor parts are two pin-shaped anchor parts (1), in which the depth of the anchor parts (1) is greater than the depth of the part of stabilization (2), and in which, distally, the anchoring parts and the stabilization part together form a concave device contour that delimits an osteoconduction zone (3).Un dispositivo de fusión para la fusión de una articulación de un paciente humano o animal, en el que la articulación es una articulación sinovial que comprende dos superficies articulares y una abertura entre ellas, comprendiendo el dispositivo de fusión: al menos dos partes de anclaje (1) y al menos una parte de estabilización (2), en el que el dispositivo de fusión tiene una profundi
