FR2717370A1 - Intervertebral stabilising prosthesis for spinal reinforcement inserted during spinal surgery - Google Patents

Intervertebral stabilising prosthesis for spinal reinforcement inserted during spinal surgery Download PDF

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Publication number
FR2717370A1
FR2717370A1 FR9403189A FR9403189A FR2717370A1 FR 2717370 A1 FR2717370 A1 FR 2717370A1 FR 9403189 A FR9403189 A FR 9403189A FR 9403189 A FR9403189 A FR 9403189A FR 2717370 A1 FR2717370 A1 FR 2717370A1
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Prior art keywords
self
intervertebral
elastic
locking
intervertebral stabilization
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FR9403189A
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French (fr)
Inventor
Moreau Patrice
Elberg Jean-Francois
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Individual
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Individual
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Priority to FR9403189A priority Critical patent/FR2717370A1/en
Priority to EP95400558A priority patent/EP0677277A3/en
Publication of FR2717370A1 publication Critical patent/FR2717370A1/en
Pending legal-status Critical Current

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Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
    • A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
    • A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
    • A61B17/70—Spinal positioners or stabilisers ; Bone stabilisers comprising fluid filler in an implant
    • A61B17/7001—Screws or hooks combined with longitudinal elements which do not contact vertebrae
    • A61B17/7002—Longitudinal elements, e.g. rods
    • A61B17/7019—Longitudinal elements having flexible parts, or parts connected together, such that after implantation the elements can move relative to each other
    • A61B17/7026—Longitudinal elements having flexible parts, or parts connected together, such that after implantation the elements can move relative to each other with a part that is flexible due to its form
    • A61B17/7028—Longitudinal elements having flexible parts, or parts connected together, such that after implantation the elements can move relative to each other with a part that is flexible due to its form the flexible part being a coil spring
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
    • A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
    • A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
    • A61B17/70—Spinal positioners or stabilisers ; Bone stabilisers comprising fluid filler in an implant
    • A61B17/7001—Screws or hooks combined with longitudinal elements which do not contact vertebrae
    • A61B17/7002—Longitudinal elements, e.g. rods
    • A61B17/7004—Longitudinal elements, e.g. rods with a cross-section which varies along its length
    • A61B17/7007—Parts of the longitudinal elements, e.g. their ends, being specially adapted to fit around the screw or hook heads
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
    • A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
    • A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
    • A61B17/70—Spinal positioners or stabilisers ; Bone stabilisers comprising fluid filler in an implant
    • A61B17/7001—Screws or hooks combined with longitudinal elements which do not contact vertebrae
    • A61B17/7002—Longitudinal elements, e.g. rods
    • A61B17/7004—Longitudinal elements, e.g. rods with a cross-section which varies along its length
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
    • A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
    • A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
    • A61B17/70—Spinal positioners or stabilisers ; Bone stabilisers comprising fluid filler in an implant
    • A61B17/7001—Screws or hooks combined with longitudinal elements which do not contact vertebrae
    • A61B17/7002—Longitudinal elements, e.g. rods
    • A61B17/7014—Longitudinal elements, e.g. rods with means for adjusting the distance between two screws or hooks

Abstract

The prosthesis comprises a hollow cylinder (1) which is slotted radially and/or helically to give it a degree of axial elasticity. The sections (4) between the slots (3) are polygonal in configuration, preferably rectangular, and upper (2a) and lower (2b) parts of the cylinder are solid and bored into axially at both ends, to receive threaded end pieces (5,6). These end pieces are embedded in anchors (11,12) which are fixed beforehand into bones (9,10). The central, hollow part of the cylinder is filled with a visco-elastic shock absorber (15) which runs into the slots (15a), thus forming an elastic tightener with damper being micrometrically regulated which can be blocked by self-locking nuts (7,8).

Description

PROTHESE INTERVERTEBRALE DE STABILISATION INTERVERTEBRAL STABILIZATION PROSTHESIS

L'invention est du domaine des prothèses articulaires destinées à suppléer les déficiences de stabilisation dans les affections articulaires tout particulièrement intervertébrales dans lesquelles le disque en coopération avec les apophyses n'assure plus ses fonctions d'origine.The invention is in the field of joint prostheses intended to compensate for stabilization deficiencies in articular affections quite particularly intervertebral in which the disc in cooperation with the processes no longer performs its original functions.

Le cas limite type est une arthrodèse dans laquelle la mobilité entre deux ou plusieurs vertèbres est gênée ou supprime, ce qui implique la pose d'un pont rigide conduisant & moyen terme, a la destruction des disques sus et sous-jacents. The typical borderline case is an arthrodesis in which the mobility between two or more vertebrae is hampered or eliminated, which implies the installation of a rigid bridge leading to the medium term, the destruction of the above and underlying discs.

On connait de nombreux brevets relatifs à de tels systèmes et en particulier le brevet FR 2631540 permettant, par un jeu de plaques cintrées possédant des trous d'écartements différents, de bloquer les pédicules lombo-sacrés par des cannelures longitudinales.We know many patents relating to such systems and in particular the patent FR 2631540 allowing, by a set of curved plates having different spacing holes, to block the lumbosacral pedicles by longitudinal grooves.

Certains systèmes préconisent, tels les brevets FR 2681525,
FR2676911 et EP 346269, l'aménagement d'un amortisseur intervertébral.Some systems recommend, such as patents FR 2681525,
FR2676911 and EP 346269, the arrangement of an intervertebral shock absorber.

Une étude antérieure des demandeurs avait d'ailleurs mis en évidence le fait qu'avec la pose d'un ressort hélicoïdal inter apcphysaire vertébral postérieur, le comportement du rachis lombaire se trouvait mélioré en flexion-extension tout en conservant sa mobilité globale.An earlier study by the applicants had, moreover, highlighted the fact that with the placement of a posterior inter-apcphyseal helical spring, the behavior of the lumbar spine was improved in flexion-extension while retaining its overall mobility.

Une étude plus fine du phénomène intervertébral montre que l'analyse doit s'orienter vers un concept de choc mécanique, plus exact dans la raite transmis selon l'axe vertébral théorique et se répartissant selon trois points d'application ; le disque et les deux apophyses articulaires constituant ainsi l'assiette intervertébrale d'assise. A more detailed study of the intervertebral phenomenon shows that the analysis must be directed towards a concept of mechanical shock, more exact in the raie transmitted along the theoretical vertebral axis and distributed according to three points of application; the disc and the two articular processes thus constituting the intervertebral base of seat.

Le rôle d'un stabilisateur dans l'esprit de l'invention est d'absorber les chocs en lieu et place des systèmes défaillants tout en conservant l'assiette intervertébrale en considérant que le disque peut etre envisagé comme un amortisseur idéal alors que les ligaments interépineux jouent le rôle d'un système élastique.The role of a stabilizer in the spirit of the invention is to absorb shocks instead of faulty systems while maintaining the intervertebral base considering that the disc can be considered as an ideal shock absorber while the ligaments interspinous play the role of an elastic system.

On peut constater de la sorte que ni les moyens mettant en oeuvre des ressorts ni ceux utilisant des amortisseurs ne peuvent, pris isolément, donner satisfaction au problème posé.It can be seen that neither the means using springs nor those using shock absorbers can, taken in isolation, give satisfaction to the problem posed.

te diagramme forces-déformation d'un ressort est en effet représente par une droite selon laquelle les forces appliquées sont proportionnelles aux fleches tandis que celui d'un amortisseur est représenté par une courbe décroissante selon laquelle les forces appliquées sont sensiblement inversement proportionnelles aux flèches.The force-deformation diagram of a spring is in fact represented by a straight line according to which the applied forces are proportional to the arrows while that of a shock absorber is represented by a decreasing curve according to which the applied forces are substantially inversely proportional to the arrows.

Un ressort ne possède pas de propriétés élastiques isotropes ; il est anisotrope par définition et sa direction élastique est donnee sensiblement, au flambage près, par son axe géométrique.A spring does not have isotropic elastic properties; it is anisotropic by definition and its elastic direction is given substantially, except for buckling, by its geometric axis.

Un solide élastique tel qu'un élastomère par exemple est isotrope par définition et sa capacite élastique ne dépend que de sa capacité d'adaptation aux déformations omnidirectionnelles (solide HOOKEEN).An elastic solid such as an elastomer for example is isotropic by definition and its elastic capacity depends only on its capacity to adapt to omnidirectional deformations (HOOKEEN solid).

Lorsqu'un solide élastique est mis en oeuvre en tant qu amortisseur, ses propriétés sont en relation avec sa contention ce qui fait que e'il est contenu dans un volume donné, ses propriétés élastiques s'en trouvent modifiées. C'est le cas type d'un cylindre en caoutchouc ajusté dans un cylindre et sollicité en compression.When an elastic solid is used as a shock absorber, its properties are related to its compression, so that if it is contained in a given volume, its elastic properties are modified. This is the typical case of a rubber cylinder fitted in a cylinder and stressed in compression.

Ainsi donc, tout système élastique tel qu'avec ressort ou tout système d'amortissement quel qu'il soit, ne peut répondre isolément aux contraintes mécaniques posées au niveau d'une liaison intervertébrale pour la simple raison évoquée cidessus, a savoir que le disque est un amortisseur travaillant conjointement et univoquement avec ses éléments élastique.Thus, any elastic system such as with spring or any damping system whatsoever, cannot respond in isolation to the mechanical stresses posed at the level of an intervertebral connection for the simple reason mentioned above, namely that the disc is a shock absorber working jointly and uniquely with its elastic elements.

complémentaires environnants.complementary surrounding.

Pour cette raison, les systèmes antérieurs connus ne peuvent donner sastisfaction.For this reason, the known prior systems cannot give satisfaction.

L'invention propose une prothèse intervertébrale de stabilisation selon laquelle l'assiette de la liason intervertébrale tend å être conservée tout en permettant rassurer, A ladite liaison, ses fonctions originales d'amortissement et d'élasticité.The invention proposes an intervertebral stabilization prosthesis according to which the base of the intervertebral connection tends to be preserved while making it possible to reassure, at said connection, its original functions of damping and elasticity.

De plus la prothèse proposée est simple dans sa mise an oeuvre, de volume reduit et de réglage de positionnement aisé lors de l'intervention chirurgicale.In addition, the proposed prosthesis is simple in its implementation, of reduced volume and of easy positioning adjustment during the surgical intervention.

La suite du texte va en donner la description en référence aux dessins annexés selon lesquels la figure 1 est un schéma en perspective montrant une liaison intervertébrale type; les figures 2 et 3 sont des vues en coupes d'une liaison type
L4/L5 en configuratin de flexion et d'extension; la figure 4 représente des diagramme6 relatifs & des ressorts et amortisseurs; la figure 5 est une vue en perspective a grande échelle du dispositf selon l'invention dans lequel une partie a été arrachée.The rest of the text will give the description with reference to the appended drawings according to which FIG. 1 is a perspective diagram showing a typical intervertebral connection; Figures 2 and 3 are sectional views of a typical connection
L4 / L5 in flexion and extension configuration; FIG. 4 represents diagrams 6 relating to springs and dampers; Figure 5 is a large-scale perspective view of the device according to the invention in which a part has been broken away.

Sur la figure 1 représentant schématiquement en perspective une liaison intervertébrale type telle qu'entre les vertèbres L4 et
L5 par exemple,ou l'on reconnalt en partie supérieure L4 le corps cervical Cv, les apophyses transverses Atd (droite) et
Atg (gauche), les apophyses articulaires Aad (droite) et Aag (gauche), l'apophyse épineuse Ae et le disque Di est interposé entre les deux coups cervicaux CvL4 et CvL5.In FIG. 1 schematically showing in perspective a typical intervertebral connection such as between the L4 vertebrae and
L5 for example, where we recognize in the upper part L4 the cervical body Cv, the transverse processes Atd (right) and
Atg (left), the articular processes Aad (right) and Aag (left), the spinous process Ae and the disc Di is interposed between the two cervical strokes CvL4 and CvL5.

L'assiette du système est assurée par la mise en appui des corps cervicaux sur le disque qui joue le rôle damortisseur et l'assise est complétée par les deux apophyses articulaires pour lesquelles les ligaments associés, notament le ligament interepineux Le, assurent la fonction élastique de l'ensemble.The base of the system is ensured by the support of the cervical bodies on the disc which acts as a shock absorber and the seat is completed by the two articular processes for which the associated ligaments, notably the interspinous ligament Le, ensure the elastic function from the whole.

Le débattement du point virtuel v par lequel passe théoriquement et instantanément la force F résultant de la charge statique augmentée des chocs dynamiques, s'effectue dans un ellipsoïde E limité par les débattements possibles le long des axes x-x' y-y' et z-z et des rotations X-Y et Z autour de ces axes, en notant que tous ces déplacements sont anormaux lorsqu'ils restent permanents et que les rotations sont normales dans les limites adimissibles généralement d^^-minFes selon le tableau ci-après
Zones inclinaison
Concernées Flexion Extension latérale Rotation
Rachis cervical 60' 649 80 165'
Rachis dorsal 35 50 peu étendue 20'
Rachis lombaire 60' 45 limitée limitée
Le point virtuel v peut donc se situer instantanément dans lEellipsolde E, image des débattements possibles maximum et la force @ se décompose elle-même en trois forces fl, f2 et f3 dont les points d'appui sont, d'une part, le disque Di et d'autre part les assises des apophyses articulaires Aad et Aag et le triangle ainsi constitué réalise l'assiette du système intervertébral.The deflection of the virtual point v through which the force F theoretically and instantaneously passes, resulting from the static load increased by dynamic shocks, takes place in an ellipsoid E limited by the possible deflections along the axes xx 'yy' and zz and the rotations XY and Z around these axes, by noting that all these displacements are abnormal when they remain permanent and that the rotations are normal within the generally admissible limits d ^^ - minFes according to the table below
Tilt zones
Concerned Flexion Lateral extension Rotation
Cervical spine 60 '649 80 165'
Dorsal spine 35 50 sparse 20 '
Lumbar spine 60 '45 limited limited
The virtual point v can therefore be located instantaneously in the Eellipsolde E, image of the maximum possible deflections and the force @ decomposes itself into three forces fl, f2 and f3 whose support points are, on the one hand, the disc Di and on the other hand the bases of the articular processes Aad and Aag and the triangle thus constituted realizes the base of the intervertebral system.

La figure 2 montre schématiquement un défaut intervertebral en flexion frelon lequel le disque Di est sollicité vers la partie externe et la figure 3 montre un défaut inverse où le disque est cette foi6 sollicité vers la partie interne ; dans les deux cas présentés connus on constate que l'assiette convenable n'est pas conservée 60it par écrasement vers l'avant (figure 2) (flexion) soit par écrasement vers l'arrière (figure 3) (extension).FIG. 2 schematically shows an intervertebral defect in hornet flexion in which the disc Di is biased towards the external part and FIG. 3 shows a reverse defect where the disc is this faith6 biased towards the internal part; in the two known cases presented, it can be seen that the suitable trim is not retained 60it by crushing towards the front (FIG. 2) (bending) or by crushing towards the rear (FIG. 3) (extension).

La figure 4 montre des diagrammes relatifs aux fonctions mécaniques des différents dispositifs d'amortissement qui peuvent etre envisagés.FIG. 4 shows diagrams relating to the mechanical functions of the various damping devices which can be envisaged.

SWr cette figure, le diagramme A représente le cas d'un amortisseur idéal h accélération constante F # = forces appliquées - α = flèche) ; le diagramme B est representatif du ce d'un ressort classique où la force est proportionnelle a la @@@@@ @@ @@@@@@@@ @ montre un amortisseur type t"1 qu'a liquide visqueux sensiblement a accélération constante ; le diagramme C retenu dans le cadre de l'application de l'invention, résulte de la mise en oeuvre conjointe d'un ressort (8) avec un amortisseur (D) réalisant ainsi, au plus près, le cas type d'un amortisseur idéal. SWr this figure, diagram A represents the case of an ideal damper h constant acceleration F # = applied forces - α = arrow); diagram B is representative of that of a conventional spring where the force is proportional to the @@@@@ @@ @@@@@@@@@ @ shows a type t "1 damper that has viscous liquid substantially accelerating constant; the diagram C retained within the framework of the application of the invention, results from the joint implementation of a spring (8) with a damper (D) thus realizing, as closely as possible, the typical case of an ideal shock absorber.

La prothèse intervertébrale représentée dans son ensemble sur la figure 5, comporte un corps de révolution oblong creux 1, cylindrique sur la figure, qui est fendu radialement et/ou hélicoïdalement comme représenté sur cette figure, afin de le rcndre élastique axialement et les sections 4 entre fentes 3 présentent une conformation polygonale, telle que rectangulaire dans l'exemple, tandis que les parties 2a supérieure et 2b inferieure sont massives et taraudées axialement, pas droite pas A gauche, pour recevoir des chapes filetées 5 et 6 et la partie centrale creuse du corps 1 est remplie au repos d'un produit viscoélastique d'amortissement 15 flué en débordement interfentes 15a de telle sorte que l'ensemble ainsi réalisé constitue un tendeur élastique avec amortissement, a réglage micrométrique blocable par des écrous autofreinés 7 et 8 tandis que les chapes 5 et 6, & oeilletons sur la figure, viennent s'encastrer dans les moyens d'ancrage 11 et 12 fixés dans les parties osseuses 9 et 10, qui peuvent par ailleurs être un endroit apte quelconque de chaque vertèbre.The intervertebral prosthesis represented as a whole in FIG. 5, comprises a hollow oblong body of revolution 1, cylindrical in the figure, which is split radially and / or helically as shown in this figure, in order to make it resilient axially and the sections 4 between slots 3 have a polygonal conformation, such as rectangular in the example, while the upper parts 2a and lower 2b are massive and tapped axially, not straight not to the left, to receive threaded yokes 5 and 6 and the hollow central part of the body 1 is filled at rest with a viscoelastic damping product 15 flowed into interfering overflow 15a so that the assembly thus produced constitutes an elastic tensioner with damping, with micrometric adjustment lockable by self-locking nuts 7 and 8 while the yokes 5 and 6, & eyecups in the figure, are fitted into the anchoring means 11 and 12 fixed d in the bone parts 9 and 10, which may moreover be any suitable place for each vertebra.

Chaque moyen d'ancrage peut être quelconque, mais préférentiellement tel que représenté sur la figure 5, constitue de moyens d'ancrage li et 12 comportant d'un côté une vis taraudPue lia ou 12a bloquée dans les on 9 ou 10 et d'un autre côté, une partie filetée llb ou 12b recouvrant les oeilletons des chapes 5 ou 6 qui se trouvent encastrés par l'effet de blocage des écrous autofreinés 13 ou 14.Each anchoring means can be arbitrary, but preferably as shown in FIG. 5, constitutes anchoring means li and 12 comprising on one side a self-tapping screw lia or 12a blocked in the on 9 or 10 and a on the other hand, a threaded part llb or 12b covering the eyecups of the yokes 5 or 6 which are embedded by the locking effect of the self-locking nuts 13 or 14.

Bien évidemment l'aspect intérieur et extérieur du corps 1 est indifférent et c'est ainsi que, lorsque cet aspect extérieur est cylindrique selon la figure 5, des trous 2c sont menaces pour l'introduction de broches 16 permettant la mise en rotation ou l'immobilisation dudit corps 1 complétée par le blocage des écrous 7 et 8 également munis de trous Hans l'exemple présenté afin de permettre l'introduction desdites broches 16.Obviously the internal and external appearance of the body 1 is indifferent and this is how, when this external appearance is cylindrical according to FIG. 5, holes 2c are threatened for the introduction of pins 16 allowing the rotation or the immobilization of said body 1 completed by the locking of the nuts 7 and 8 also provided with holes Hans the example presented in order to allow the introduction of said pins 16.

On peut bien entendu envisager toute autre conformations extérieures telles que méplate, hExagonale... pour le corps 1 et/ou les écrous 7, 8.It is of course possible to envisage any other external conformation such as flat, hExagonal ... for the body 1 and / or the nuts 7, 8.

De même le corps 1 est rendu élastique axialement par des fentes qui peuvent être radiales et/ou hélicoldales en toute configuration et combinaison possibles, dans la mesure ou sont obtenus conjointement l'effet élastique recherché avec l'effet de rigidite souhaité. Likewise the body 1 is made axially elastic by slots which can be radial and / or helical in any possible configuration and combination, insofar as the desired elastic effect is obtained jointly with the desired stiffness effect.

Ces deux effets peuvent être préprogrammés par des moyens informatiques resultant par exemple d'examens radio ou RNN préalables et permettre ainsi la conformation informatisee des fentes au moyen d'un usinage adequat par commandes numériques ceci pouvant avoir une certaine incidence sur les colts de réalisation ou la rapidité d'execution.These two effects can be preprogrammed by computer means resulting for example from radio or RNN preliminary examinations and thus allow the computerized conformation of the slots by means of an adequate machining by numerical controls this being able to have a certain incidence on the colts of realization or the speed of execution.

Par ai1 leurs, la determination dimensionnelle du ressort constitué du corps 1 fendu, peut être aidée par les formulations en usage (normes...) telles que par exemple celle.Furthermore, the dimensional determination of the spring constituted by the split body 1 can be helped by the formulations in use (standards, etc.) such as, for example, that.

données dans l'ouvrage Les Ressorts Hélicoldaux, RPt Techno Nathan-Lavoisier", en particulier pour lu prise en compte des contraintes admissibles # pour le matériau constitutif utilisé.given in the book Les Ressorts Hélicoldaux, RPt Techno Nathan-Lavoisier ", in particular for taking into account the admissible constraints # for the constituent material used.

Enfin une gaine protectrice souple 17 peut etre disposez le long du corps 1 de manière A éviter des risques de projection de brisures du produit viscoélastique 15, dans la masse ligamentaire environnante.Finally, a flexible protective sheath 17 can be placed along the body 1 so as to avoid risks of projection of broken viscoelastic product 15, in the surrounding ligament mass.

La mise en oeuvre d'une telle prothèse intervertabrale permet de restaurer, dans une certaine mesure, leb débattements du point virtue; v a l'intérieur de l'ellipsoïde E et ce par sollicitation conjointe du rassort et du produit viscoelastique qui peut être un élastomère (par exemple) en notant que tous les materiaux utilisés sont biocompatibles comme relà est d'usage et que les dites prothèses peuvent etre disposées en nombres convenables notamment deux å deux entre chaque vertèbre aux lieux et emplacements convenables. The implementation of such an intervertebral prosthesis makes it possible to restore, to a certain extent, the deflections of the virtual point; goes inside the ellipsoid E and this by joint solicitation of the reassort and of the viscoelastic product which can be an elastomer (for example) by noting that all the materials used are biocompatible as is usual and that the said prostheses can be arranged in suitable numbers, in particular two by two between each vertebra at suitable places and locations.

Claims (4)

REVENDICATIONS 1) Prothèse intervertébrale de stabilisation caractérisée en ce qu'elle comporte un corps de révolution oblong creux 1 tel que cylindrique fendu radialement et/ou hélicoïdalement afin de le rendre élastique axialement et les sections 4 entre fentes 3 présentent une conformation polygonale de préférence rectangulaire, tandis que les parties supérieures 2a et inferieure 2b dudit corps 1 sont massives et taraudées axialement pas a droite-pas à gauche pour recevoir des chapes filetées 5 et 6 et la partie centrale creuse du corps 1 est remplie au repos d'un produit viscoélastique d'amortlssement 15 flué en débordement interfen-es 15a ; I'ensemble constituant ainsi un tendeur élastique b amortissements et réglage micrométrique blocable par des écrous autofreinés 7 et 8 alors que les chapes 5 et 6 viennent 'encastrer dans les moyens ancrage il et 12 préfixés dans les parties osseuses 9 et 10. CLAIMS 1) Intervertebral stabilization prosthesis characterized in that it comprises a hollow oblong body of revolution 1 such as cylindrical split radially and / or helically in order to make it elastic axially and the sections 4 between slots 3 have a polygonal conformation preferably rectangular , while the upper 2a and lower 2b parts of said body 1 are massive and axially tapped not to the right-not to the left to receive threaded yokes 5 and 6 and the hollow central part of the body 1 is filled at rest with a viscoelastic product damping 15 flowed overflow interfen-es 15a; The assembly thus constituting an elastic tensioner b damping and micrometric adjustment lockable by self-locking nuts 7 and 8 while the yokes 5 and 6 come to be embedded in the anchoring means il and 12 prefixed in the bone parts 9 and 10. 2) Prothèse intervertébrale de stabilisation selon la revendication 1 caractérisée en ce que chaque moyen d'ancrage 11 ou 12 comporte d'un côté, une vis taraudeuse lia ou 12a bloquée dans les os 9 ou 10 et d'un autre côté une partie filetée llb ou 12b recevant une chape 5 ou 6 qui se trouve encastrée par l'effet de blocage d'écrous autofreinés 13 ou 14.2) Intervertebral stabilization prosthesis according to claim 1 characterized in that each anchoring means 11 or 12 comprises on one side, a tapping screw 11a or 12a blocked in the bones 9 or 10 and on the other side a threaded part llb or 12b receiving a clevis 5 or 6 which is embedded by the locking effect of self-locking nuts 13 or 14. 3) Prothese intervertébrale de stabilisation selon l'une quelconque des revendications 1 ou 2 caractérisée en ce que, lorsque le corps 1 et les écrou. autofreinés 7 et 8 sont cylindriques, des trous de réglage, de positionnement et de blocage 2c, 7a, Sa sont ménagés sur l'extérieur et recevable d'une broche 16.3) Intervertebral stabilization prosthesis according to any one of claims 1 or 2 characterized in that, when the body 1 and the nuts. self-braking 7 and 8 are cylindrical, adjustment, positioning and locking holes 2c, 7a, Sa are provided on the outside and can be accommodated with a spindle 16. 4) Prothèse intervertébrale de stabilisation selon l'une quelconque des revendications 1 - 2 ou 3 caractérisée en ce que, lorsTIe le corps 1 et les écrous autofreinés 7 et 8 sont non cylindriques tel qu'hexagonaux par exemple, le réglage, le positionnement et le blocage seffectuent avec une clé plate ordinaire. 4) Intervertebral stabilization prosthesis according to any one of claims 1 - 2 or 3 characterized in that, when the body 1 and the self-locking nuts 7 and 8 are non-cylindrical such as hexagonal for example, adjustment, positioning and blocking is carried out with an ordinary flat key.
FR9403189A 1994-03-18 1994-03-18 Intervertebral stabilising prosthesis for spinal reinforcement inserted during spinal surgery Pending FR2717370A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
FR9403189A FR2717370A1 (en) 1994-03-18 1994-03-18 Intervertebral stabilising prosthesis for spinal reinforcement inserted during spinal surgery
EP95400558A EP0677277A3 (en) 1994-03-18 1995-03-15 Spinal prosthetic assembly.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR9403189A FR2717370A1 (en) 1994-03-18 1994-03-18 Intervertebral stabilising prosthesis for spinal reinforcement inserted during spinal surgery

Publications (1)

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FR2717370A1 true FR2717370A1 (en) 1995-09-22

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FR (1) FR2717370A1 (en)

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