Abstract: The screw (1) comprises an end formed by a dog point (2) having a plane transverse surface (3) and a cylindrical lateral surface (4) connected to the plane surface (3) by a rounded annular radius (5), it also comprises a threaded part (6) contiguous with the dog point (2) in which a self-tapping zone (8) is made which terminates at the base of the dog point (2), a smooth cylindrical part (9) being moreover arranged between its threaded part (6) and its head (11). The smooth part (9) is connected to the head (11) by an inclined plane zone (12). The rounded dog point (2) makes it possible to hold back without harming any mucosa or aponeurosis situated behind a bone through which the screw passes. The smooth parts (9 and 12) avoid damage to the skin of the patient. This screw is intended to be positioned very precisely and to remain anchored in the patient for the whole time necessary for the planned investigations, which avoids repeated piercing of the cranium or of any bone at each examination.

Abstract: This implant comprises a body (1) consisting of a smooth head (2) and of a cylindrical rod (3) threaded over the whole of its length, and whose end (13) is rounded, straight longitudinal grooves moreover being made starting from the rounded end (13) over part of the length of the threaded rod (3), and one or several diametral transverse holes (15) being formed at the halfway point or a lower point of the body (1) of the implant; these features permit a more intimate immobilization of the implant with the osseous elements in the bone socket (alveolus), and they contribute to limiting the compression of the bone and therefore oppose its becoming brittle through demineralization; the undestroyed osseous debris is collected in the grooves (14) and in the hole (15), which thus permits an ossification and a transvascularization the implant, the hole (15) moreover limiting the dehiscence of the bone from its smooth head (2).

Abstract: An implant comprises a part intended for osseous anchoring and a body for fixation on a rod. The body has a channel opening out at a rear part of the body, delimiting two lateral branches and open on each side of the body so as to be able to receive the rod. The implant also comprises a threaded plug adapted so as to be able to be screwed in tappings formed on the inside walls of the two lateral branches in order to lock the rod in translation and in rotation. The implant includes a small plate for connection between the plug and the rod, which small plate is provided with a mechanism for fixing it to the branches of the body.

Abstract: An osteosynthesis spinal device comprises two rods (1, 2), anterior and posterior rods, respectively. Plates (4) for fixation of the anterior rod (1) to the extreme vertebral bodies, for example T12 and L3, have an arched surface corresponding to the anterolateral anatomy of the vertebral bodies. The plates (4) are equipped with screws (14) for locking the rod (1) and screws (5) of the cancellous bone type. Screws (3) ensure the osseous anchoring of the posterior rod (2) and bars (6) for transverse connection of the rods (1 and 2) constitute with the rods, a rigid frame assembly. The anterior rod (1) reinforces the stability and the rigidity of the assembly and is advantageously embedded in a furrow (30) made in the vertebral bodies which is subsequently covered with the periostrum.

Abstract: This implant has in combination a pair of clamps (2) provided with spikes (3) and with screws (5) for fixing to two corresponding vertebrae (V2, V4) and notches (23) to support the tips of the blades of a pair of distraction forceps, a rigid plate (6) for interconnecting the two clamps (2) and whose ends are pierced with orifices (17) in which may engage threaded pieces (12) of the camps (2) and whose length (L) corresponds to the distance between the posterior orifices (9) of the clamps (2) after distraction of the vertebrae, and lastly nuts (7) for rigidly connecting together the plate (6) and the clamps (2). This implant has, in particular, the advantage of permitting distraction by the forceps bearing against the clamps instead of against the vertebrae, which was not possible with the previously known plates; in addition, it is compact while at the same time being sufficiently solid, and thus prevents any risk of rubbing against the aorta.

Abstract: The invention relates to a device for supporting the rachis comprising at least one pin and at least two anchoring members attached thereto. According to the invention, said device is characterized in that the pin is of constant cross-section throughout its length and presents a rough surface, and in that the anchoring members are provided with pressure means cooperating with said pin. The invention finds applications in the straightening and/or support of a rachis, especially in preparation for an arthrodesis.