FR3029770A1 - INTERVERTEBRAL CAGE - Google Patents
INTERVERTEBRAL CAGE Download PDFInfo
- Publication number
- FR3029770A1 FR3029770A1 FR1402839A FR1402839A FR3029770A1 FR 3029770 A1 FR3029770 A1 FR 3029770A1 FR 1402839 A FR1402839 A FR 1402839A FR 1402839 A FR1402839 A FR 1402839A FR 3029770 A1 FR3029770 A1 FR 3029770A1
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- branch
- intervertebral cage
- cage according
- come
- branches
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- Granted
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- 210000000988 bone and bone Anatomy 0.000 claims description 4
- 230000000295 complement effect Effects 0.000 claims description 2
- 239000000316 bone substitute Substances 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 208000014674 injury Diseases 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 230000008733 trauma Effects 0.000 description 1
Classifications
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- 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
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- 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
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- 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
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- A61F2002/30001—Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
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- A61F2002/30004—Material related properties of the prosthesis or of a coating on the prosthesis the prosthesis being made from materials having different values of a given property at different locations within the same prosthesis
- A61F2002/30014—Material related properties of the prosthesis or of a coating on the prosthesis the prosthesis being made from materials having different values of a given property at different locations within the same prosthesis differing in elasticity, stiffness or compressibility
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- 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
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- 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
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- 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
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- 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
- A61F2002/30331—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements made by longitudinally pushing a protrusion into a complementarily-shaped recess, e.g. held by friction fit
- A61F2002/30362—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements made by longitudinally pushing a protrusion into a complementarily-shaped recess, e.g. held by friction fit with possibility of relative movement between the protrusion and the recess
- A61F2002/30364—Rotation about the common longitudinal axis
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
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- 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
- A61F2002/30481—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements locked by an additional locking mechanism using a locking clip
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- A—HUMAN NECESSITIES
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- 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
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- 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
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- 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
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- A—HUMAN NECESSITIES
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- 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
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Landscapes
- Health & Medical Sciences (AREA)
- Engineering & Computer Science (AREA)
- Biomedical Technology (AREA)
- Neurology (AREA)
- Orthopedic Medicine & Surgery (AREA)
- Cardiology (AREA)
- Oral & Maxillofacial Surgery (AREA)
- Transplantation (AREA)
- Heart & Thoracic Surgery (AREA)
- Vascular Medicine (AREA)
- Life Sciences & Earth Sciences (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Prostheses (AREA)
Abstract
La présente invention concerne les cages intervertébrales aptes à être interposées entre les deux corps vertébraux Cv1, Cv2 de deux vertèbres consécutives. La cage selon l'invention est essentiellement caractérisée par le fait qu'elle est constituée d'une plaque courbe 10 comportant une première et une seconde branches 12, 14 aptes à venir au contact respectivement des deux corps vertébraux, et une paroi de liaison 16 relativement élastique reliant les deux branches sensiblement en une de leurs extrémités respectives 18, 20, des premiers moyens 21 pour fixer un point 23 de la première branche 12, dit "premier point", au corps vertébral Cv1 avec lequel elle est destinée à venir en contact, et des seconds moyens 22 pour fixer un point 24 de la seconde branche 14, dit "second point", à l'autre des deux corps vertébraux Cv2 avec lequel elle est destinée à venir en contact.The present invention relates to the intervertebral cages adapted to be interposed between the two vertebral bodies Cv1, Cv2 of two consecutive vertebrae. The cage according to the invention is essentially characterized in that it consists of a curved plate 10 having first and second branches 12, 14 adapted to come into contact respectively with the two vertebral bodies, and a connecting wall 16 relatively elastic connecting the two branches substantially at one of their respective ends 18, 20, first means 21 for fixing a point 23 of the first branch 12, said "first point", the vertebral body Cv1 with which it is intended to come into contact, and second means 22 for fixing a point 24 of the second branch 14, said "second point" to the other of the two vertebral bodies Cv2 with which it is intended to come into contact.
Description
1 CAGE INTERVERTÉBRALE La présente invention concerne les cages intervertébrales aptes à être interposées entre les corps vertébraux respectivement de deux 5 vertèbres consécutives en remplacement ou en complément du disque vertébral. On connaît déjà des cages intervertébrales, par exemple celles qui sont décrites dans les brevets FR-2930423 et EP-2638880 au nom du Demandeur.The present invention relates to intervertebral cages adapted to be interposed between the vertebral bodies respectively of two consecutive vertebrae replacing or complementing the vertebral disc. Intervertebral cages are already known, for example those described in patents FR-2930423 and EP-2638880 in the name of the Applicant.
10 D'une façon générale, une telle cage est constituée d'un élément solide, rigide et de moyens pour le solidariser avec les deux corps vertébraux. Ce type de cage donne généralement satisfaction, mais peut présenter un inconvénient dû à sa rigidité. En effet, à cause de sa rigidité, 15 les disques intervertébraux situés entre les corps vertébraux des vertèbres à proximité et/ou au voisinage des deux vertèbres séparées par cette cage risquent de subir des efforts plus importants que ceux auxquels ils devraient être normalement soumis. A la longue, ces disques originaux collatéraux peuvent être le siège 20 de déformations ou dégradations entraînant de nouvelles douleurs pour le patient sur lequel a été implantée la cage. Aussi, la présente invention a-t-elle pour but de réaliser une cage intervertébrale qui pallie en grande partie l'inconvénient mentionné ci-dessus.In general, such a cage consists of a solid, rigid element and means for securing it to the two vertebral bodies. This type of cage generally gives satisfaction, but may have a disadvantage due to its rigidity. Indeed, because of its rigidity, the intervertebral discs located between the vertebral bodies of the vertebrae in proximity and / or in the vicinity of the two vertebrae separated by this cage may experience greater efforts than those to which they should normally be subjected. In the long run, these collateral originals may be the seat of deformations or degradations causing new pain for the patient on whom the cage has been implanted. Also, the present invention aims to achieve an intervertebral cage which largely overcomes the disadvantage mentioned above.
25 Plus précisément, la présente invention a pour objet une cage intervertébrale apte à être interposée entre les deux corps vertébraux de deux vertèbres consécutives, caractérisée par le fait qu'elle est constituée : - d'une plaque courbe comportant une première et une seconde branches aptes à venir au contact respectivement des deux corps 30 vertébraux, et une paroi de liaison relativement élastique reliant les deux branches sensiblement en une de leurs extrémités respectives, 3029770 - des premiers moyens pour fixer un point de la première branche, dit "premier point", au corps vertébral avec lequel elle est destinée à venir en contact, et - des seconds moyens pour fixer un point de la seconde branche, dit "second point", à l'autre des deux corps vertébraux avec lequel elle est destinée à venir en contact. D'autres caractéristiques et avantages de la présente invention apparaîtront au cours de la description suivante donnée en regard des dessins annexés à titre illustratif mais nullement limitatif, dans lesquels : Les figures 1-1 et 1-2 représentent deux schémas de principe de réalisation de la cage selon l'invention apte à être interposée entre les deux corps vertébraux de deux vertèbres consécutives en remplacement ou en complément du disque vertébral, En accord spécifiquement avec la représentation schématique selon la figure 1-1 : Les figures 2 à 5 représentent différentes vues d'un premier mode de réalisation de la cage selon l'invention, - Les figures 6 à 9 représentent différentes vues d'un deuxième mode de réalisation de la cage selon l'invention, Les figures 10 à 12 représentent trois vues d'un troisième mode de réalisation de la cage selon l'invention, les figures 10 et 11 étant des vues en perspective, la figure 12 étant une vue partielle de dessus en coupe, et Là figure 13 représente, en perspective, un élément constitutif de la cage selon l'invention, en l'occurrence une lame avec son embase, apte à entrer dans la constitution des trois modes de réalisation illustrés sur les figures 2 à 12. Il est tout d'abord précisé que, sur les figures, les mêmes références désignent les mêmes éléments, quelle que soit la figure sur laquelle elles apparaissent et quelle que soit la forme de représentation de ces éléments. De même, si des éléments ne sont pas spécifiquement référencés sur l'une des figures, leurs références peuvent être aisément retrouvées en se reportant à une autre figure.More specifically, the subject of the present invention is an intervertebral cage adapted to be interposed between the two vertebral bodies of two consecutive vertebrae, characterized in that it consists of: a curved plate comprising a first and a second limb adapted to come into contact respectively with the two vertebral bodies, and a relatively elastic connecting wall connecting the two branches substantially at one of their respective ends, 3029770 - first means for fixing a point of the first branch, said "first point" , to the vertebral body with which it is intended to come into contact, and - second means for fixing a point of the second branch, called "second point", to the other of the two vertebral bodies with which it is intended to come into contact. contact. Other features and advantages of the present invention will become apparent from the following description given with reference to the accompanying drawings, by way of illustration but in no way limiting, in which: FIGS. 1-1 and 1-2 show two schematic diagrams of the embodiment of the cage according to the invention adapted to be interposed between the two vertebral bodies of two consecutive vertebrae replacing or complementing the vertebral disc, in agreement specifically with the schematic representation according to Figure 1-1: Figures 2 to 5 represent different views of a first embodiment of the cage according to the invention, - Figures 6 to 9 show different views of a second embodiment of the cage according to the invention, Figures 10 to 12 show three views of a third embodiment of the cage according to the invention, Figures 10 and 11 being perspective views, Figure 12 being a partial view of sectional view, and Figure 13 represents, in perspective, a constituent element of the cage according to the invention, in this case a blade with its base, adapted to enter the constitution of the three embodiments illustrated in Figures 2 to 12. It is first of all specified that, in the figures, the same references designate the same elements, whatever the figure on which they appear and whatever the form of representation of these elements. Similarly, if elements are not specifically referenced in one of the figures, their references can be easily found by referring to another figure.
3029770 3 Il est aussi précisé que les figures représentent un certain nombre de modes de réalisation de l'objet selon l'invention, mais qu'il peut en exister d'autres qui répondent à la définition de cette invention. Il est en outre précisé que, lorsque, selon la définition de l'invention, 5 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 10 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 15 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 enfin précisé que, dans la présente description, si l'adverbe 20 "sensiblement" est associé à un qualificatif d'un moyen donné, ce qualificatif doit être compris au sens strict ou approché. Il est bien précisé que par "cage" au sens de la présente invention, on comprend un élément destiné à être interposé entre deux vertèbres, comme une cage intervertébrale proprement dite selon la terminologie habituelles 25 des Praticiens, mais aussi un disque intervertébral, une prothèse discale pour des indications particulières où l'on souhaite limiter l'amplitude des mouvements des vertèbres les unes par rapport aux autres, d'une façon générale tout élément apte à restituer totalement ou partiellement la hauteur originelle entre les deux vertèbres pour quelque raison que ce soit.It is also stated that the figures represent a number of embodiments of the object according to the invention, but that there may be others 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 comprises 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 particular number of these elements, the object of the invention may be defined as comprising "at least one" of these elements. Lastly, it is pointed out that when, in the present description, an expression alone defines, without any particular specific reference to it, a set of structural characteristics, these characteristics may be taken for the definition of the object of the protection sought. when technically possible, either separately or in full and / or partial combination. Finally, it is specified that, in the present description, if the adverb 20 "substantially" is associated with a qualifier of a given means, this qualifier must be understood in the strict sense or approached. It is clearly stated that "cage" within the meaning of the present invention comprises an element intended to be interposed between two vertebrae, such as an intervertebral cage proper according to the usual terminology of the Practitioners, but also an intervertebral disc, a prosthesis discale for particular indications where it is desired to limit the amplitude of the movements of the vertebrae with respect to each other, in a general manner any element capable of restoring totally or partially the original height between the two vertebrae for some reason that this is.
30 En référence plus particulièrement aux figures 1-1 et 1-2, la présente invention concerne une cage intervertébrale telle que définie ci-dessus, apte à être interposée entre les deux' corps vertébraux Cv1, Cv2 de deux vertèbres consécutives.With particular reference to Figures 1-1 and 1-2, the present invention relates to an intervertebral cage as defined above, adapted to be interposed between the two vertebral bodies Cv1, Cv2 of two consecutive vertebrae.
3029770 Cette cage est constituée d'une plaque courbe 10 comportant une première et une seconde branches 12, 14 aptes à venir au contact respectivement des deux corps vertébraux, et une paroi de liaison 16 relativement élastique reliant les deux branches sensiblement en une de 5 leurs extrémités respectives 18, 20. Une telle plaque courbe peut être réalisée de différentes façons, par exemple par usinage, par formage, en une seule pièce ou par assemblage de plusieurs pièces. La cage comporte en outre des premiers moyens 21 pour fixer un 10 point 23 de la première branche 12, dit "premier point", au corps vertébral Cv1 avec lequel elle est destinée à venir en contact, et des seconds moyens 22 pour fixer un point 24 de la seconde branche 14, dit "second point", à l'autre des deux corps vertébraux Cv2 avec lequel elle est destinée à venir en contact.This cage consists of a curved plate 10 having first and second branches 12, 14 adapted to come into contact with the two vertebral bodies respectively, and a relatively elastic connecting wall 16 connecting the two branches substantially in one of their respective ends 18, 20. Such a curved plate can be made in different ways, for example by machining, by forming, in one piece or by assembly of several parts. The cage further comprises first means 21 for fixing a point 23 of the first branch 12, called "first point", to the vertebral body Cv1 with which it is intended to come into contact, and second means 22 for fixing a point 24 of the second branch 14, said "second point" to the other of the two vertebral bodies Cv2 with which it is intended to come into contact.
15 La plaque courbe 10 peut se présenter sous différentes formes, par exemple selon l'une des deux formes suivantes : en U, en Z, mais préférentiellement en U comme illustré sur les figures 1-1 et 2 à 12. Selon une réalisation très préférentielle, les moyens 21, 22 pour fixer un point 23, 24 d'au moins l'une des branches 12, 14 au corps vertébral 20 avec lequel elle est destinée à venir en contact sont constitués par une lame 31, 32 ayant une extrémité coupante apte à pénétrer dans un milieu osseux, et des moyens pour monter la lame en rotation par rapport à la branche, de façon qu'elle soit apte à prendre deux positions, à savoir une première position (Fig. 4, 5, 10, 11 et 12) dans laquelle la lame est entièrement 25 comprise dans le volume délimité par la surface enveloppant extérieurement les deux branches 12, 14, et une seconde position (Fig. 2, 3, 6, 7, 8 et 9) dans laquelle, après sa rotation à partir de la première position, au moins une partie de l'extrémité coupante de la lame émerge de cette surface enveloppante, en précisant que cette lame peut avoir différentes formes, 30 droites, courbes, recourbées, etc. De façon tout à fait avantageuse, les moyens pour monter la lame en rotation par rapport à la branche 'comportent une embase cylindrique 34 (Fig. 13) solidaire de l'extrémité de la lame 31, 32 opposée à son extrémité 3029770 5 coupante, un orifice 36 réalisé dans la branche 12, 14, (Fig. 8, 9, 10 et 12), cet orifice ayant une section complémentaire de la section transversale de l'embase cylindrique de façon que l'embase soit apte à pivoter dans l'orifice, et des moyens 35 pour lier l'embase 34 en rotation avec la branche sans 5 possibilité de translation. De façon préférentielle d'un point de vue industriel, les moyens 35 pour lier l'embase 34 en rotation avec la branche comportent (figures 12 et 13) au moins une gorge circulaire 38 réalisée dans la paroi latérale de l'embase 34, au moins une percée traversante 39, 40 réalisée dans la 10 branche selon une direction sensiblement orthogonale à l'axe de l'orifice 36, cette percée étant réalisée de façon qu'elle intercepte cet orifice 36 et que son axe passe sensiblement par la gorge 38 quand l'embase 34 est enfichée dans l'orifice, et une broche 42 enfichée dans la percée traversante en passant par la gorge 38.The curved plate 10 may be in various forms, for example according to one of the following two forms: in U, in Z, but preferably in U as illustrated in FIGS. 1-1 and 2 to 12. According to one embodiment, Preferably, the means 21, 22 for fixing a point 23, 24 of at least one of the branches 12, 14 to the vertebral body 20 with which it is intended to come into contact are constituted by a blade 31, 32 having one end cutter adapted to penetrate into a bone medium, and means for mounting the blade in rotation with respect to the branch, so that it is able to take two positions, namely a first position (FIG 4, 5, 10, 11 and 12) in which the blade is wholly within the volume delimited by the outer wrapping surface of the two legs 12, 14, and a second position (Fig. 2, 3, 6, 7, 8 and 9) in which, after its rotation from the first position, at least a portion of the cutting end of the blade emerges from this enveloping surface, specifying that this blade can have different shapes, straight, curved, curved, etc. Advantageously, the means for mounting the blade in rotation relative to the limb 'comprise a cylindrical base 34 (FIG 13) integral with the end of the blade 31, 32 opposite its cutting end 3029770 5, an orifice 36 made in the branch 12, 14, (FIG 8, 9, 10 and 12), this orifice having a complementary section of the cross section of the cylindrical base so that the base is pivotable in the orifice, and means 35 for linking the base 34 in rotation with the branch without the possibility of translation. Preferably, from an industrial point of view, the means 35 for linking the base 34 in rotation with the branch comprise (FIGS. 12 and 13) at least one circular groove 38 made in the lateral wall of the base 34, minus one throughthrough 39, 40 made in the branch in a direction substantially orthogonal to the axis of the orifice 36, this breakthrough being made so that it intercepts this orifice 36 and that its axis passes substantially through the groove 38 when the base 34 is plugged into the orifice, and a pin 42 plugged into the through hole through the groove 38.
15 Bien que la plaque courbe 10 puisse avoir différentes formes, selon une réalisation avantageuse, elle présente une forme sensiblement en U, figure 1-1, et l'orifice 36 est alors réalisé dans la branche 12, 14 de façon qu'il débouche sur la tranche 12-1, 14-1 de cette branche correspondant à une extrémité libre du U. Quand la cage comporte deux orifices 36, un 20 réalisé dans chaque branche dans le cas où la cage comporte des moyens pour fixer les deux branches respectivement aux deux corps vertébraux, il est encore plus avantageux que ces deux orifices débouchent tous les deux sur un même côté de la cage, comme plus particulièrement visible sur la figure 10.Although the curved plate 10 may have different shapes, according to an advantageous embodiment, it has a shape substantially U-shaped, Figure 1-1, and the orifice 36 is then made in the branch 12, 14 so that it opens on the edge 12-1, 14-1 of this branch corresponding to a free end of the U. When the cage comprises two orifices 36, a 20 formed in each branch in the case where the cage comprises means for securing the two branches respectively to the two vertebral bodies, it is even more advantageous that these two openings both open on the same side of the cage, as more particularly visible in Figure 10.
25 Il est évident que, du fait de l'élasticité de la paroi de liaison 16, les extrémités libres des deux branches correspondant aux extrémités libres de la forme en U vont pouvoir se rapprocher, par exemple par pivotement et/ou translation sous l'action d'efforts imposés à aux deux vertèbres et aux vertèbres collatérales.It is obvious that, due to the elasticity of the connecting wall 16, the free ends of the two branches corresponding to the free ends of the U-shape will be able to approach, for example by pivoting and / or translation under the action of forces imposed on the two vertebrae and the collateral vertebrae.
30 Il est donc préférable que la cage comporte en outre des moyens de butée 50 pour limiter le rapprochement des deux branches 12, 14 l'une par rapport à l'autre.It is therefore preferable that the cage further comprises abutment means 50 to limit the approximation of the two branches 12, 14 relative to each other.
3029770 6 Selon une réalisation préférentielle, ces moyens de butée 50 quand la plaque courbe présente une forme sensiblement en U, sont constitués par une butée 51 solidaire sensiblement de l'extrémité libre d'une des deux branches 12, 14 et une contre butée 52 solidaire de l'autre branche 14, 12, 5 la butée et la contre butée étant agencées de façon que, lorsque les extrémités libres respectivement des deux branches se rapprochent l'une de l'autre, la butée et la contre butée soient aptes à venir au contact l'une de l'autre. Ce rapprochement peut être limité à une valeur prédéterminée, notamment pour ne pas mettre en danger la santé du patient dans lequel 10 serait implantée une telle cage. Selon une réalisation possible, figures 6 à 12, la butée 51 est constituée par un bossage 54 réalisé sur une branche et la contre butée 52 est constituée par l'autre branche qui est réalisée de façon que son extrémité libre 56 soit sensiblement au moins au même niveau, pris dans un 15 plan sensiblement perpendiculaire au plan général des branches, que le bossage. En outre, pour favoriser l'accrochage d'au moins l'une des branches avec le corps vertébral osseux (de préférence des deux branches avec les deux corps vertébraux), il est préférable que cette au moins une branche 20 comporte une cavité borgne 60 ouverte sur sa face qui est apte à venir en contact avec un corps vertébral, de façon qu'il puisse être logé dans cette cavité un greffon ou substitut osseux qui pourra de ce fait reposer sur son fond 61 qui est une partie amincie de la branche dans laquelle est réalisée la cavité, pouf éviter que le greffon ne vienne se positionner entre les deux 25 branches, au risque d'entraîner leur solidification l'une à l'autre et de faire ainsi perdre à la cage selon l'invention tous ses avantages. Comme illustré et plus particulièrement visible sur la figure 11, la paroi de liaison 16 est amincie pour lui conférer sa relative élasticité. En outre, pour pouvoir faire pivoter la ou les lames 31, 32, l'embase 30 34 de chaque lame comporte un trou axial 70 à section transversale polygonale, pour être apte à recevoir un outil, par exemple du type tournevis six-pans ou analogue, de façon à faire passer la ou les lames de leur première position à leur seconde position comme décrit ci-avant.According to a preferred embodiment, these abutment means 50 when the curved plate has a substantially U-shaped shape, consist of an abutment 51 substantially integral with the free end of one of the two branches 12, 14 and a counter-abutment 52. integral with the other limb 14, 12, 5 the abutment and the abutment being arranged so that, when the free ends of the two limbs respectively approach each other, the abutment and the abutment are adapted to come into contact with each other. This approximation may be limited to a predetermined value, especially not to endanger the health of the patient in which 10 such a cage would be implanted. According to one possible embodiment, FIGS. 6 to 12, the stop 51 is formed by a boss 54 made on one limb and the abutment 52 is constituted by the other limb which is made so that its free end 56 is substantially at least same level, taken in a plane substantially perpendicular to the general plane of the branches, that the boss. In addition, to promote the attachment of at least one of the branches with the bone vertebral body (preferably of the two branches with the two vertebral bodies), it is preferable that this at least one branch 20 comprises a blind cavity 60 open on its face which is adapted to come into contact with a vertebral body, so that it can be housed in this cavity a graft or bone substitute which can thus rest on its bottom 61 which is a thinned part of the branch in which the cavity is made, in order to prevent the graft from coming into position between the two branches, at the risk of causing them to solidify to one another and thus to cause the cage according to the invention to lose all its advantages. As illustrated and more particularly visible in Figure 11, the connecting wall 16 is thinned to give it its relative elasticity. In addition, in order to be able to pivot the blade or blades 31, 32, the base 34 of each blade has an axial hole 70 with a polygonal cross section, to be able to receive a tool, for example of the six-piece screwdriver type or analogous, so as to move the blade or blades from their first position to their second position as described above.
3029770 7 Bien entendu, comme dans les cages de l'art antérieur, les faces des branches destinées à venir au contact des corps vertébraux osseux peuvent, comme illustré sur les figures 6 à 11, comporter des picots, ou analogues pour favoriser l'accrochage de chaque branche avec le corps 5 vertébral. La cage telle que décrite ci-dessus, pincée entre deux vertèbres consécutives, présente une certaine flexibilité qui permet d'éviter l'apparition, sur les étages de vertèbres adjacentes, du traumatisme qui pouvait se produire avec les cages rigides de l'art antérieur. 10Of course, as in the cages of the prior art, the faces of the branches intended to come into contact with the vertebral bone bodies may, as illustrated in FIGS. 6 to 11, comprise pins, or the like, to promote the snagging. of each branch with the vertebral body. The cage as described above, pinched between two consecutive vertebrae, has a certain flexibility which makes it possible to avoid the appearance, on the stages of adjacent vertebrae, of the trauma that could occur with the rigid cages of the prior art. . 10
Claims (12)
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FR1402839A FR3029770B1 (en) | 2014-12-12 | 2014-12-12 | INTERVERTEBRAL CAGE |
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Cited By (2)
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FR3136959A1 (en) * | 2022-06-28 | 2023-12-29 | Hassan Razian | Intervertebral cage |
FR3136960A1 (en) * | 2022-06-28 | 2023-12-29 | Hassan Razian | Intervertebral cage |
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WO2009129605A1 (en) * | 2008-04-22 | 2009-10-29 | Kinetic Spine Technologies Inc. | Artificial intervertebral spacer |
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FR3136959A1 (en) * | 2022-06-28 | 2023-12-29 | Hassan Razian | Intervertebral cage |
FR3136960A1 (en) * | 2022-06-28 | 2023-12-29 | Hassan Razian | Intervertebral cage |
EP4299039A1 (en) | 2022-06-28 | 2024-01-03 | Hassan Razian | Intervertebral cage |
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