FR2981261A1 - Intervertebral cage, has line arranged perpendicular to axis of stem of screw to plane of two branches, two bearing surfaces and spacing subjected to non-slip treatment e.g. shot-blasting treatment - Google Patents

Intervertebral cage, has line arranged perpendicular to axis of stem of screw to plane of two branches, two bearing surfaces and spacing subjected to non-slip treatment e.g. shot-blasting treatment Download PDF

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Publication number
FR2981261A1
FR2981261A1 FR1103139A FR1103139A FR2981261A1 FR 2981261 A1 FR2981261 A1 FR 2981261A1 FR 1103139 A FR1103139 A FR 1103139A FR 1103139 A FR1103139 A FR 1103139A FR 2981261 A1 FR2981261 A1 FR 2981261A1
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France
Prior art keywords
branches
spacer
cavities
axis
base
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Granted
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FR1103139A
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French (fr)
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FR2981261B1 (en
Inventor
Philippe Cottin
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Teijin Nakashima Medical Co Ltd
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Kisco International SARL
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Priority to FR1103139A priority Critical patent/FR2981261B1/en
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Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2/44—Joints for the spine, e.g. vertebrae, spinal discs
    • A61F2/4455—Joints for the spine, e.g. vertebrae, spinal discs for the fusion of spinal bodies, e.g. intervertebral fusion of adjacent spinal bodies, e.g. fusion cages
    • A61F2/447—Joints for the spine, e.g. vertebrae, spinal discs for the fusion of spinal bodies, e.g. intervertebral fusion of adjacent spinal bodies, e.g. fusion cages substantially parallelepipedal, e.g. having a rectangular or trapezoidal cross-section
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2002/30001—Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
    • A61F2002/30108—Shapes
    • A61F2002/3011—Cross-sections or two-dimensional shapes
    • A61F2002/30112—Rounded shapes, e.g. with rounded corners
    • A61F2002/30131—Rounded shapes, e.g. with rounded corners horseshoe- or crescent- or C-shaped or U-shaped
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2002/30001—Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
    • A61F2002/30108—Shapes
    • A61F2002/30199—Three-dimensional shapes
    • A61F2002/30224—Three-dimensional shapes cylindrical
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2002/30001—Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
    • A61F2002/30316—The prosthesis having different structural features at different locations within the same prosthesis; Connections between prosthetic parts; Special structural features of bone or joint prostheses not otherwise provided for
    • A61F2002/30329—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
    • A61F2002/30476—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements locked by an additional locking mechanism
    • A61F2002/30507—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements locked by an additional locking mechanism using a threaded locking member, e.g. a locking screw or a set screw
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2002/30001—Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
    • A61F2002/30316—The prosthesis having different structural features at different locations within the same prosthesis; Connections between prosthetic parts; Special structural features of bone or joint prostheses not otherwise provided for
    • A61F2002/30535—Special structural features of bone or joint prostheses not otherwise provided for
    • A61F2002/30537—Special structural features of bone or joint prostheses not otherwise provided for adjustable
    • A61F2002/30538—Special structural features of bone or joint prostheses not otherwise provided for adjustable for adjusting angular orientation
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2002/30001—Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
    • A61F2002/30316—The prosthesis having different structural features at different locations within the same prosthesis; Connections between prosthetic parts; Special structural features of bone or joint prostheses not otherwise provided for
    • A61F2002/30535—Special structural features of bone or joint prostheses not otherwise provided for
    • A61F2002/30579—Special structural features of bone or joint prostheses not otherwise provided for with mechanically expandable devices, e.g. fixation devices

Abstract

The cage has a U-shaped body (10) including two branches (11, 12) and a base (13). A set of cavities (16, 17) is formed, where distance separating two parallel free sides (16-1, 17-1) from the set of cavities is lower than width of a part of a spacing (30) with regard to a line (D). The line is arranged perpendicular to an axis (23) of a stem of a screw (22) to a plane of the branches, two bearing surfaces (14, 15) and the spacing subjected to a non-slip treatment e.g. shot-blasting treatment.

Description

PERFECTIONNEMENT A UNE CAGE INTERVERTEBRALE La présente invention concerne un implant dit "cage intersomatique" ou "cage intervertébrale", destiné à être implanté, généralement par voie postérieure, entre les corps vertébraux de deux vertèbres lombaires consécutives, à la place du disque déficient initialement présent entre les deux vertèbres. Une telle cage permet la fusion des corps vertébraux après discectomie, tout en conservant la distance intervertébrale. Il est déjà connu de telles cages, comme celles qui sont décrites et 10 illustrées dans le FR-A-2 715 293 et le FR-A-2 866 229. Une telle cage selon l'art antérieur est par exemple illustrée sur la figure 1 en annexe de la présente description. Elle comprend un corps en forme de U comportant de ce fait deux branches et une pièce de liaison reliant deux premières extrémités des branches, les faces respectivement 15 des deux branches situées aux secondes extrémités des deux branches et se faisant face l'une l'autre comportant chacune une surface d'appui délimitant un dièdre comprenant une petite base et une grande base, une vis comportant une tête en appui contre la pièce de liaison et une tige de vis définissant un axe longitudinal traversant librement la pièce de liaison et la 20 petite base et passant entre les deux branches, et une pièce d'écartement mobile en translation vissée sur la tige de vis, cette pièce d'écartement étant en contact glissant sur les deux surfaces d'appui. La structure de la cage selon le premier document antérieur cité ci-dessus est illustrée sur la figure 1, par la combinaison des traits continus et 25 interrompus, tandis que la cage selon le second document antérieur cité est illustrée sur cette figure 1 uniquement par la représentation en traits continus. L'homme du métier pourra facilement interpréter cette figure 1 en se reportant d'une part aux deux documents cités ci-dessus et d'autre part à la description donnée ci-après en regard de la figure 2. 30 Ces cages antérieures donnent satisfaction sur le plan médical, mais peuvent présenter un inconvénient, notamment lors d'une manoeuvre inadaptée au cours de leur mise en place. En effet, leur structure entraîne le risque relativement important que, lors de son dévissage, la pièce d'écartement mobile ne s'échappe par l'extrémité ouverte de la cage se trouvant entre les deux branches du U. L'invention a donc pour but de réaliser une cage lombaire perfectionnée par rapport à celles qui sont décrites dans les deux 5 documents référencés ci-dessus, pour tenter de limiter autant que possible cet inconvénient. Plus précisément, la présente invention concerne une cage intervertébrale comprenant un corps en forme de U comportant deux branches et une base reliant deux premières extrémités des branches, les 10 faces respectivement des deux branches situées aux secondes extrémités des deux dites branches et se faisant face l'une l'autre comportant chacune une surface d'appui, ces deux surfaces d'appui délimitant un dièdre comprenant une petite base et une grande base, une vis comportant une tête en appui contre la portion de base et une tige de vis définissant un axe 15 longitudinal traversant librement la base et passant entre les deux branches, une pièce d'écartement mobile en translation vissée sur la tige de vis, cette dite pièce d'écartement étant en contact glissant sur les deux surfaces d'appui, ledit dièdre ayant sa petite base tournée vers les premières extrémités des deux branches et sa grande base tournée vers les secondes 20 extrémités de ces deux branches, chacun des deux bords du dièdre correspondant à la grande base étant conformé en cavité concave dont la concavité est tournée vers les premières extrémités des deux branches, la surface concave de chacune des deux dites cavités ayant une forme sensiblement congruente de celle de la surface extérieure de ladite pièce 25 d'écartement, la distance séparant les deux bords libres parallèles des deux cavités étant inférieure à la largeur de la pièce d'écartement prise selon une droite perpendiculaire à l'axe de la tige de vis et au plan des deux branches, les deux couples de portions des deux surfaces d'appui et de la pièce d'écartement qui sont aptes à glisser les unes sur les autres sont soumises 30 à un traitement anti-glissement. D'autres caractéristiques et avantages de la présente invention apparaîtront à la lecture de la description suivante donnée en regard des dessins annexés dans lesquels: - la figure 1 est une vue longitudinale de côté d'une cage intervertébrale selon l'art antérieur le plus proche, et - la figure 2 est une vue longitudinale de côté d'un mode de réalisation de la cage intervertébrale selon l'invention. The present invention relates to an implant called "intervertebral cage" or "intervertebral cage" intended to be implanted, generally posteriorly, between the vertebral bodies of two consecutive lumbar vertebrae, in place of the deficient disc initially present. between the two vertebrae. Such a cage allows the fusion of the vertebral bodies after discectomy, while maintaining the intervertebral distance. Such cages are already known, such as those described and illustrated in FR-A-2 715 293 and FR-A-2 866 229. Such a cage according to the prior art is for example illustrated in FIG. 1 in the appendix of this description. It comprises a U-shaped body thus comprising two branches and a connecting piece connecting two first ends of the branches, the faces respectively 15 of the two branches located at the second ends of the two branches and facing each other each having a bearing surface defining a dihedron comprising a small base and a large base, a screw having a head bearing against the connecting piece and a screw rod defining a longitudinal axis freely traversing the connecting piece and the small base and passing between the two branches, and a spacer movable in translation screwed on the screw rod, this spacer being in sliding contact on the two bearing surfaces. The cage structure according to the first prior art document cited above is illustrated in FIG. 1 by the combination of continuous and interrupted lines, whereas the cage according to the aforementioned second prior art document is illustrated in this FIG. representation in continuous lines. Those skilled in the art will easily be able to interpret this FIG. 1 by referring, on the one hand, to the two documents cited above and, on the other hand, to the description given below with reference to FIG. on a medical level, but may present a disadvantage, especially during an unsuitable maneuver during their establishment. Indeed, their structure carries the relatively high risk that, during its unscrewing, the movable spacer does not escape through the open end of the cage between the two branches of the U. The invention therefore has aim to achieve an improved lumbar cage compared to those described in the two documents referenced above, to try to limit as much as possible this disadvantage. More specifically, the present invention relates to an intervertebral cage comprising a U-shaped body having two branches and a base connecting two first ends of the branches, the faces respectively of the two branches located at the second ends of said two branches and facing each other. each other having a bearing surface, these two bearing surfaces defining a dihedron comprising a small base and a large base, a screw having a head bearing against the base portion and a screw rod defining a longitudinal axis freely traversing the base and passing between the two branches, a spacer movable in translation screwed onto the screw rod, said spacer being in sliding contact on the two bearing surfaces, said dihedral having its small base facing the first ends of the two branches and its large base facing the second 20 ends of these two branches, each of the two edges of the dihedron corresponding to the large base being shaped concave cavity whose concavity is turned towards the first ends of the two branches, the concave surface of each of said two cavities having a shape substantially congruent with that of the outer surface of said spacer 25, the distance separating the two parallel free edges of the two cavities being less than the width of the spacer part taken along a straight line perpendicular to the axis of the screw rod and the plane of the two branches, the two pairs of portions of the two bearing surfaces and of the spacer which are able to slide on one another are subjected to an anti-slip treatment. Other features and advantages of the present invention will appear on reading the following description given with reference to the accompanying drawings, in which: FIG. 1 is a longitudinal side view of an intervertebral cage according to the closest prior art and FIG. 2 is a longitudinal side view of an embodiment of the intervertebral cage according to the invention.

Il est précisé que la figure 2 représente un mode de réalisation de l'objet selon l'invention, mais qu'il peut exister d'autres modes de réalisation qui répondent à la définition de cette invention. Il est en outre précisé que, lorsque, selon la définition de l'invention, l'objet de l'invention comporte "au moins un" élément ayant une fonction donnée, le mode de réalisation décrit peut comporter plusieurs de ces éléments. Réciproquement, si le mode de réalisation de l'objet selon l'invention tel qu'illustré comporte plusieurs éléments de fonction identique et si, dans la description, il n'est pas spécifié que l'objet selon cette invention doit obligatoirement comporter un nombre particulier de ces éléments, l'objet de l'invention pourra être défini comme comportant "au moins un" de ces éléments. Il est enfin précisé que lorsque, dans la présente description, une expression définit à elle seule, sans mention particulière spécifique la concernant, un ensemble de caractéristiques structurelles, ces caractéristiques peuvent être prises, pour la définition de l'objet de la protection demandée, quand cela est techniquement possible, soit séparément, soit en combinaison totale et/ou partielle. Il est en outre souligné que, s'il en était besoin pour l'homme du métier, les deux descriptions des deux documents antérieurs référencés ci-25 avant, doivent être considérées comme faisant partie intégrante de la description donnée ci-après. Ainsi précisé, en référence à la figure 2, la présente invention concerne une cage intervertébrale comprenant un corps 10 en forme de U comportant deux branches 11, 12 et une base 13 reliant deux premières 30 extrémités 11-1, 12-1 des branches, les faces respectivement des deux branches situées aux secondes extrémités 11-2, 12-2 des deux dites branches et se faisant face l'une l'autre comportant chacune une surface 2 9 8 1 2 6 1 4 d'appui 14, 15, ces deux surfaces d'appui délimitant un dièdre comprenant une petite base et une grande base. La cage comporte en outre une vis 20 comportant une tête 21 en appui contre la base 13 et une tige de vis 22 définissant un axe longitudinal 5 23 traversant librement la base 13 et passant entre les deux branches, et une pièce d'écartement 30 mobile en translation vissée sur la tige de vis 22, cette pièce d'écartement 30 étant en contact glissant sur les deux surfaces d'appui 14, 15. Selon une caractéristique importante de l'invention, le dièdre défini ci-10 dessus a sa petite base tournée vers les premières extrémités 11-1, 12-1 des deux branches 11, 12 et sa grande base tournée vers les secondes extrémités 11-2, 12-2 de ces deux branches. En outre, chacun des deux bords du dièdre correspondant à la grande base est conformé en cavité concave 16, 17 dont la concavité est 15 tournée vers les premières extrémités 11-1, 12-1 des deux branches 11, 12, et la surface concave de chacune de ces deux cavités a une forme sensiblement congruente de celle de la surface extérieure de la pièce d'écartement 30. De plus, la distance séparant les deux bords libres parallèles 16-1, 20 17-1 des deux cavités 16, 17 est inférieure à la largeur de la pièce d'écartement 30 prise selon une droite D perpendiculaire à l'axe 23 de la tige de vis 22 et au plan des deux branches 11, 12, et optionnellement au diamètre de la tige de vis 22. Pour éviter que, après implantation de la cage, la pièce d'écartement 25 30 revienne à sa position origine, les deux couples de portions des deux surfaces d'appui 14, 15 et de la pièce d'écartement 30 qui sont aptes à glisser les unes sur les autres sont soumises à un traitement antiglissement. A titre d'exemple préféré, le traitement anti-glissement est choisi 30 parmi les traitements suivants : grenaillage, microbillage, dépolissage, dépôt d'une couche de matériau rugueux. De façon préférentielle et avantageuse, les deux cavités concaves 16, 17 sont sensiblement définies sur une surface cylindrique de révolution dont l'axe de révolution est sensiblement situé sur l'axe longitudinal 23 de la tige de vis 22 et est sensiblement perpendiculaire à la droite D. De façon avantageuse, en conséquence de la caractéristique ci-dessus, la pièce d'écartement 30 est de forme cylindrique de révolution autour d'un axe de révolution sensiblement confondu avec l'axe de révolution des deux cavités 16, 17 quand cette pièce d'écartement 30 est située dans ces cavités et à leur contact. De façon également très préférentielle, la petite base du dièdre est légèrement supérieure à la section de la tige de vis 22. It is pointed out that FIG. 2 represents an embodiment of the object according to the invention, but that there may be other embodiments that meet the definition of this invention. It is furthermore specified that, when, according to the definition of the invention, the object of the invention comprises "at least one" element having a given function, the embodiment described may comprise several of these elements. Conversely, if the embodiment of the object according to the invention as illustrated has several elements of identical function and if, in the description, it is not specified that the object according to this invention must obligatorily comprise a number particular of these elements, the object of the invention may be defined as comprising "at least one" of these elements. Lastly, it is specified that when, in the present description, an expression defines, by itself, without a specific particular mention concerning it, a set of structural characteristics, these characteristics may be taken, for the definition of the object of the protection requested, when technically possible, either separately, or in full and / or partial combination. It is further pointed out that, if it were needed by those skilled in the art, the two descriptions of the two earlier documents referenced above should be considered as an integral part of the description given below. Thus, with reference to FIG. 2, the present invention relates to an intervertebral cage comprising a U-shaped body 10 comprising two branches 11, 12 and a base 13 connecting two first ends 11-1, 12-1 of the branches, the faces respectively of the two branches located at the second ends 11-2, 12-2 of the two said arms and facing each other each having a bearing surface 14, 15, these two bearing surfaces defining a dihedron comprising a small base and a large base. The cage further comprises a screw 20 comprising a head 21 bearing against the base 13 and a screw rod 22 defining a longitudinal axis 23 freely traversing the base 13 and passing between the two branches, and a moving spacer 30 in translation screwed on the screw rod 22, this spacer 30 being in sliding contact on the two bearing surfaces 14, 15. According to an important feature of the invention, the dihedron defined above has its small base turned towards the first ends 11-1, 12-1 of the two branches 11, 12 and its large base facing the second ends 11-2, 12-2 of these two branches. In addition, each of the two edges of the dihedral corresponding to the large base is shaped concave cavity 16, 17 whose concavity is turned towards the first ends 11-1, 12-1 of the two branches 11, 12, and the concave surface each of these two cavities has a shape substantially congruent with that of the outer surface of the spacer 30. In addition, the distance separating the two parallel free edges 16-1, 17-1 of the two cavities 16, 17 is less than the width of the spacer 30 taken along a line D perpendicular to the axis 23 of the screw shaft 22 and to the plane of the two branches 11, 12, and optionally to the diameter of the screw rod 22. To avoid that, after implantation of the cage, the spacer 25 30 returns to its original position, the two pairs of portions of the two bearing surfaces 14, 15 and the spacer 30 which are capable of sliding the ones on the others are subjected to a treatment antigl ! WARNING. As a preferred example, the anti-slip treatment is chosen from among the following treatments: shot peening, microbilling, etching, deposition of a layer of rough material. Preferably and advantageously, the two concave cavities 16, 17 are substantially defined on a cylindrical surface of revolution whose axis of revolution is substantially located on the longitudinal axis 23 of the screw rod 22 and is substantially perpendicular to the straight line. D. Advantageously, as a consequence of the above characteristic, the spacer 30 is of cylindrical shape of revolution about an axis of revolution substantially coincident with the axis of revolution of the two cavities 16, 17 when this spacer 30 is located in these cavities and in contact therewith. Also very preferentially, the small base of the dihedron is slightly greater than the section of the screw rod 22.

L'utilisation et l'implantation d'une telle cage selon l'invention ne sera pas décrite ici, car elles se déduisent sans aucune difficulté de la présente description faite ci-dessus et des deux descriptions des deux documents référencés au préambule. The use and implantation of such a cage according to the invention will not be described here, because they are deduced without any difficulty from the above description and two descriptions of the two documents referenced in the preamble.

Claims (6)

REVENDICATIONS1. Cage intervertébrale comprenant : - un corps (10) en forme de U comportant : * deux branches (11, 12) et * une base (13) reliant deux premières extrémités (11-1, 12-1) des branches, les faces respectivement des deux branches situées aux secondes extrémités (11-2, 12-2) des deux dites branches et se faisant face l'une l'autre comportant chacune une surface d'appui (14, 15), ces deux surfaces d'appui délimitant un dièdre comprenant une petite base et une grande base, - une vis (20) comportant une tête (21) en appui contre la base (13) et une tige de vis (22) définissant un axe longitudinal (23) traversant librement 15 base (13) et passant entre les deux branches, et - une pièce d'écartement (30) mobile en translation vissée sur la tige de vis (22), cette dite pièce d'écartement (30) étant en contact glissant sur les deux surfaces d'appui (14, 15), caractérisée en ce que 20 - ledit dièdre a sa petite base tournée vers les premières extrémités (11-1, 12-1) des deux branches (11, 12) et sa grande base tournée vers les secondes extrémités (11-2, 12-2) de ces deux branches, - chacun des deux bords du dièdre correspondant à la grande base est conformé en cavité concave (16, 17) dont la concavité est tournée vers 25 les premières extrémités (11-1, 12-1) des deux branches (11, 12), - chacune des deux dites cavités a une surface concave ayant une forme sensiblement congruente de celle de la surface extérieure de ladite pièce d'écartement (30), - la distance séparant les deux bords libres parallèles (16-1, 17-1) des 30 deux cavités (16, 17) est inférieure à la largeur de la pièce d'écartement (30) prise selon une droite (D) perpendiculaire à l'axe (23) de la tige de vis (22) et au plan des deux branches (11, 12), et- les deux couples de portions des deux surfaces d'appui (14, 15) et de la pièce d'écartement (30) qui sont aptes à glisser les unes sur les autres sont soumises à un traitement anti-glissement. REVENDICATIONS1. Intervertebral cage comprising: - a U-shaped body (10) comprising: * two branches (11, 12) and * a base (13) connecting two first ends (11-1, 12-1) of the branches, the faces respectively two branches located at the second ends (11-2, 12-2) of the two said arms and facing each other each having a bearing surface (14, 15), these two bearing surfaces defining a dihedron comprising a small base and a large base, - a screw (20) having a head (21) bearing against the base (13) and a screw rod (22) defining a longitudinal axis (23) freely traversing base (13) and passing between the two branches, and - a spacer (30) movable in translation screwed on the screw rod (22), said spacer (30) being in sliding contact on both surfaces bearing (14, 15), characterized in that 20 - said dihedron has its small base facing the first ends (11-1, 12-1) of both branches (11, 12) and its large base facing the second ends (11-2, 12-2) of these two branches, - each of the two edges of the dihedron corresponding to the large base is shaped concave cavity (16, 17 ) whose concavity is turned towards the first ends (11-1, 12-1) of the two branches (11, 12), - each of said two cavities has a concave surface having a shape substantially congruent with that of the outer surface of said spacer (30), the distance between the two parallel free edges (16-1, 17-1) of the two cavities (16, 17) is less than the width of the spacer (30). ) taken along a line (D) perpendicular to the axis (23) of the screw shaft (22) and the plane of the two branches (11, 12), and the two pairs of portions of the two bearing surfaces ( 14, 15) and the spacer (30) which are slidable on each other are subjected to anti-slip treatment. 2. Cage selon la revendication 1, caractérisée en ce que la distance séparant les deux bords libres parallèles (16-1, 17-1) des deux cavités (16, 17) est inférieure au diamètre de la tige de vis (22). 2. Cage according to claim 1, characterized in that the distance separating the two parallel free edges (16-1, 17-1) of the two cavities (16, 17) is smaller than the diameter of the screw rod (22). 3. Cage selon l'une des revendications 1 et 2, caractérisée en ce que les deux cavités concaves (16, 17) sont sensiblement définies sur une surface cylindrique de révolution dont l'axe de révolution est sensiblement situé sur l'axe longitudinal (23) de ladite tige de vis (22) et est sensiblement perpendiculaire à ladite droite (D). 3. Cage according to one of claims 1 and 2, characterized in that the two concave cavities (16, 17) are substantially defined on a cylindrical surface of revolution whose axis of revolution is substantially located on the longitudinal axis ( 23) of said screw rod (22) and is substantially perpendicular to said straight line (D). 4. Cage selon la revendication 3, caractérisée en ce que ladite pièce d'écartement (30) est de forme cylindrique de révolution autour d'un axe de révolution sensiblement confondu avec l'axe de révolution des deux cavités (16, 17) quand cette pièce d'écartement (30) est au contact de ces deux cavités. 4. Cage according to claim 3, characterized in that said spacer (30) is of cylindrical shape of revolution about an axis of revolution substantially coincident with the axis of revolution of the two cavities (16, 17) when this spacer (30) is in contact with these two cavities. 5. Cage selon l'une quelconque des revendications 1 à 4, caractérisée en ce que la petite base du dièdre est légèrement supérieure à la section de ladite tige de vis (22). 5. Cage according to any one of claims 1 to 4, characterized in that the small base of the dihedron is slightly greater than the section of said screw rod (22). 6. Cage selon l'une quelconque des revendications 1 à 5, caractérisée en ce que ledit traitement anti-glissement est choisi parmi les traitements suivants : grenaillage, microbillage, dépolissage, dépôt d'une couche de matériau rugueux. 6. Cage according to any one of claims 1 to 5, characterized in that said anti-slip treatment is selected from the following treatments: shot peening, microbilling, etching, deposition of a layer of rough material.
FR1103139A 2011-10-14 2011-10-14 IMPROVEMENT TO AN INTERVERTEBRAL CAGE Active FR2981261B1 (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9788971B1 (en) 2013-05-22 2017-10-17 Nuvasive, Inc. Expandable fusion implant and related methods
US9801734B1 (en) 2013-08-09 2017-10-31 Nuvasive, Inc. Lordotic expandable interbody implant
US10195053B2 (en) 2009-09-18 2019-02-05 Spinal Surgical Strategies, Llc Bone graft delivery system and method for using same
US10245159B1 (en) 2009-09-18 2019-04-02 Spinal Surgical Strategies, Llc Bone graft delivery system and method for using same
US10973656B2 (en) 2009-09-18 2021-04-13 Spinal Surgical Strategies, Inc. Bone graft delivery system and method for using same

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Publication number Priority date Publication date Assignee Title
FR2771282A1 (en) * 1997-11-25 1999-05-28 Jean Taylor Surgical support implant for spine
US6368351B1 (en) * 2001-03-27 2002-04-09 Bradley J. Glenn Intervertebral space implant for use in spinal fusion procedures
FR2866229A1 (en) * 2004-02-17 2005-08-19 Kiscomedica Lumbar cage for patient, has branches with front ends spaced angularly by unscrewing of screw and separation of spacing roller from head, where roller supports free front ends of branches against pressure exerted by vertebral body

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2771282A1 (en) * 1997-11-25 1999-05-28 Jean Taylor Surgical support implant for spine
US6368351B1 (en) * 2001-03-27 2002-04-09 Bradley J. Glenn Intervertebral space implant for use in spinal fusion procedures
FR2866229A1 (en) * 2004-02-17 2005-08-19 Kiscomedica Lumbar cage for patient, has branches with front ends spaced angularly by unscrewing of screw and separation of spacing roller from head, where roller supports free front ends of branches against pressure exerted by vertebral body

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10195053B2 (en) 2009-09-18 2019-02-05 Spinal Surgical Strategies, Llc Bone graft delivery system and method for using same
US10245159B1 (en) 2009-09-18 2019-04-02 Spinal Surgical Strategies, Llc Bone graft delivery system and method for using same
US10973656B2 (en) 2009-09-18 2021-04-13 Spinal Surgical Strategies, Inc. Bone graft delivery system and method for using same
US11660208B2 (en) 2009-09-18 2023-05-30 Spinal Surgical Strategies, Inc. Bone graft delivery system and method for using same
US9788971B1 (en) 2013-05-22 2017-10-17 Nuvasive, Inc. Expandable fusion implant and related methods
US10219915B1 (en) 2013-05-22 2019-03-05 Nuvasive, Inc. Expandable fusion implant and related methods
US9801734B1 (en) 2013-08-09 2017-10-31 Nuvasive, Inc. Lordotic expandable interbody implant
US10492924B2 (en) 2013-08-09 2019-12-03 Nuvasive, Inc. Lordotic expandable interbody implant
US11696836B2 (en) 2013-08-09 2023-07-11 Nuvasive, Inc. Lordotic expandable interbody implant

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