FR2723841A1 - Lumbar vertebral disc prosthesis - Google Patents
Lumbar vertebral disc prosthesis Download PDFInfo
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- FR2723841A1 FR2723841A1 FR9410201A FR9410201A FR2723841A1 FR 2723841 A1 FR2723841 A1 FR 2723841A1 FR 9410201 A FR9410201 A FR 9410201A FR 9410201 A FR9410201 A FR 9410201A FR 2723841 A1 FR2723841 A1 FR 2723841A1
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- plates
- enclosure
- wall
- deformable
- capsules
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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
- A61F2/442—Intervertebral or spinal discs, e.g. resilient
-
- 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
- A61F2/441—Joints for the spine, e.g. vertebrae, spinal discs made of inflatable pockets or chambers filled with fluid, e.g. with hydrogel
-
- 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
- A61F2002/30235—Three-dimensional shapes cylindrical tubular, e.g. sleeves
-
- 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
- A61F2002/30563—Special structural features of bone or joint prostheses not otherwise provided for having elastic means or damping means, different from springs, e.g. including an elastomeric core or shock absorbers
-
- 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
- A61F2002/30581—Special structural features of bone or joint prostheses not otherwise provided for having a pocket filled with fluid, e.g. liquid
- A61F2002/30586—Special structural features of bone or joint prostheses not otherwise provided for having a pocket filled with fluid, e.g. liquid having two or more inflatable pockets or chambers
-
- 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
- A61F2002/448—Joints for the spine, e.g. vertebrae, spinal discs comprising multiple adjacent spinal implants within the same intervertebral space or within the same vertebra, e.g. comprising two adjacent spinal implants
-
- 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
- A61F2230/00—Geometry of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
- A61F2230/0063—Three-dimensional shapes
- A61F2230/0069—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
- A61F2310/00—Prostheses classified in A61F2/28 or A61F2/30 - A61F2/44 being constructed from or coated with a particular material
- A61F2310/00005—The prosthesis being constructed from a particular material
- A61F2310/00011—Metals or alloys
- A61F2310/00017—Iron- or Fe-based alloys, e.g. stainless steel
-
- 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
- A61F2310/00—Prostheses classified in A61F2/28 or A61F2/30 - A61F2/44 being constructed from or coated with a particular material
- A61F2310/00005—The prosthesis being constructed from a particular material
- A61F2310/00011—Metals or alloys
- A61F2310/00023—Titanium or titanium-based alloys, e.g. Ti-Ni alloys
-
- 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
- A61F2310/00—Prostheses classified in A61F2/28 or A61F2/30 - A61F2/44 being constructed from or coated with a particular material
- A61F2310/00005—The prosthesis being constructed from a particular material
- A61F2310/00011—Metals or alloys
- A61F2310/00029—Cobalt-based alloys, e.g. Co-Cr alloys or Vitallium
Landscapes
- Health & Medical Sciences (AREA)
- Engineering & Computer Science (AREA)
- Biomedical Technology (AREA)
- Orthopedic Medicine & Surgery (AREA)
- Neurology (AREA)
- Oral & Maxillofacial Surgery (AREA)
- Cardiology (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)
- Dispersion Chemistry (AREA)
- Chemical & Material Sciences (AREA)
- Prostheses (AREA)
Abstract
Description
PROTHESE DE DISQUE INTERVERTEBRAL
L'invention concerne un dispositif constituant une prothèse de disque intervertébral, plus particulièrement destinée à la zone lombaire de la colonne vertébrale du corps humain, le dispositif comportant deux capsules à volume variable.INTERVERTEBRAL DISK PROSTHESIS
The invention relates to a device constituting an intervertebral disc prosthesis, more particularly intended for the lumbar region of the spine of the human body, the device comprising two capsules with variable volume.
La dégénérescence des disques intervertébraux de la région lombaire de la colonne vertébrale du corps humain, en particulier entre les vertèbres L4-L5 et
L5-S1 peut conduire à des situations invalidantes nécessitant l'ablation du disque. II est alors nécessaire soit de bloquer le couple de vertèbres en cause pour interdire tout mouvement relatif (arthrodèse) soit de remplacer le disque par une prothèse.The degeneration of the intervertebral discs of the lumbar region of the spine of the human body, in particular between the L4-L5 vertebrae and
L5-S1 can lead to debilitating situations requiring ablation of the disc. It is then necessary either to block the couple of vertebrae in question to prevent any relative movement (arthrodesis) or to replace the disc with a prosthesis.
On connaît des dispositifs constituant des prothèses de disques intervertébraux, tel celui décrit dans le document EP0304305, composé de deux capsules cylindriques déformables en fibres composites inertes, les capsules renfermant un gel thixotropique et étant reliées chacune à un réservoir fermé par une membrane auto-obturable. Ces capsules indépendantes sont introduites vides ou partiellement remplies chacune dans un forage pratiqué sensiblement parallèlement aux plateaux vertébraux dans le disque détérioré laissé en place, le gel étant introduit ensuite dans chaque capsule à l'aide d'une seringue perforant la membrane de chaque réservoir. Les inconvénients de ce dispositif sont nombreux et nous en citerons quelques uns.Le disque intervertébral original étant perforé perd l'essentiel de ses caractéristiques de résistance, imposant aux capsules la totalité de la transmission des efforts, en particulier des efforts de compression dont divers essais et mesures ont montré qu'il atteignent et dépassent 350 daN dans la zone lombaire. Ces efforts induisent dans le gel des pressions supérieures à 100 b qui ne sont pas supportables par les membranes auto-obturables. Les capsules une fois en place fonctionnant à volume constant ne peuvent permettre qu'une faible amplitude du mouvement relatif des vertèbres adjacentes, très éloignée de l'amplitude normale.There are known devices constituting intervertebral disc prostheses, such as that described in document EP0304305, composed of two deformable cylindrical capsules made of inert composite fibers, the capsules containing a thixotropic gel and being each connected to a tank closed by a self-sealing membrane. . These independent capsules are introduced empty or partially filled each in a borehole practiced substantially parallel to the vertebral plates in the damaged disc left in place, the gel then being introduced into each capsule using a syringe perforating the membrane of each reservoir. The disadvantages of this device are numerous and we will cite a few of them. The original intervertebral disc being perforated loses most of its resistance characteristics, imposing on the capsules the entire transmission of forces, in particular compressive forces including various tests and measurements have shown that it reaches and exceeds 350 daN in the lumbar region. These efforts induce pressures in the gel greater than 100 b which cannot be supported by the self-sealing membranes. The capsules once in place operating at constant volume can only allow a small amplitude of the relative movement of the adjacent vertebrae, very far from the normal amplitude.
L'invention se propose de remédier à ces inconvénients en prévoyant un dispositif de prothèse de disque intervertébral, plus particulièrement destiné à la zone lombaire de la colonne vertébrale du corps humain, constitué de deux capsules déformables disposées dans l'espace intervertébral symétriquement par rapport au plan sagittal médian des vertèbres adjacentes, le volume des capsules pouvant être réduit pour faciliter l'introduction, caractérisé en ce que chaque capsule est constituée de deux plateaux rigides, parallèles en l'absence de contraintes extérieures, munis de moyens d'ancrage dans les vertèbres adjacentes et reliés par une enveloppe déformable de manière à constituer une enceinte étanche à volume variable, chaque enceinte étant remplie par un fluide à faible compressibilité.The invention proposes to remedy these drawbacks by providing an intervertebral disc prosthesis device, more particularly intended for the lumbar region of the spine of the human body, consisting of two deformable capsules placed in the intervertebral space symmetrically with respect to the sagittal median plane of the adjacent vertebrae, the volume of the capsules being able to be reduced to facilitate insertion, characterized in that each capsule is made up of two rigid plates, parallel in the absence of external constraints, provided with anchoring means in the adjacent vertebrae and connected by a deformable envelope so as to constitute a sealed enclosure with variable volume, each enclosure being filled with a fluid with low compressibility.
L'invention prévoit également que l'enveloppe déformable est constituée d'une double paroi, la paroi intérieure étant constituée par un soufflet à ondes multiples, la paroi extérieure étant constituée par un soufflet à une seule onde, la paroi intérieure et la paroi extérieure pouvant être constituées de matériaux différents.The invention also provides that the deformable envelope is made up of a double wall, the inside wall being made up of a multiple wave bellows, the outside wall being made up of a single wave bellows, the inside wall and the outside wall. can be made of different materials.
Une autre caractéristique de l'invention est que, pour chaque capsule, des moyens sont prévus pour limiter les déplacements relatifs des plateaux, ces moyens étant situés à l'intérieur de chaque enceinte étanche. Dans un forme possible de la réalisation, les moyens sont constitués pour un plateau par une protubérance de forme cylindrique à base circulaire coopérant avec un logement cylindrique à base circulaire de l'autre plateau, un jeu radial étant prévu pour permettre un débattement angulaire relatif et une variation de distance des plateaux. Dans une autre forme possible, les moyens sont constitués par une rotule raccordée à l'un des plateaux, cette rotule coopérant avec un logement cylindrique à base circulaire de l'autre plateau, un jeu étant prévu pour permettre une variation de distance des plateaux.Another characteristic of the invention is that, for each capsule, means are provided for limiting the relative displacements of the plates, these means being located inside each sealed enclosure. In a possible embodiment, the means are constituted for a plate by a cylindrical protuberance with circular base cooperating with a cylindrical housing with circular base of the other plate, a radial clearance being provided to allow relative angular movement and a variation in distance of the plates. In another possible form, the means consist of a ball joint connected to one of the plates, this ball cooperating with a cylindrical housing with circular base of the other plate, a clearance being provided to allow a variation in distance of the plates.
L'invention est également caractérisée en ce que l'un des deux plateaux constituant chaque capsule est muni de moyens pour remplir, vider et obturer l'enceinte. Dans une forme préférentielle, les moyens sont constitués par un conduit aménagé dans le volume du plateau, ce conduit débouchant à l'une de ses extrémités dans l'enceinte et à l'autre extrémité vers l'extérieur, cette dernière extrémité étant munie d'un bouchon, le conduit étant muni d'un clapet anti retour interdisant le reflux du fluide hors de l'enceinte, le clapet pouvant être neutralisé pour vider l'enceinte. The invention is also characterized in that one of the two plates constituting each capsule is provided with means for filling, emptying and closing the enclosure. In a preferred form, the means consist of a conduit arranged in the volume of the plate, this conduit opening at one of its ends in the enclosure and at the other end towards the outside, this latter end being provided with 'a plug, the duct being provided with a non-return valve preventing the back flow of the fluid out of the enclosure, the valve being able to be neutralized to empty the enclosure.
Une autre caractéristique de l'invention est que les enveloppes déformables sont raccordées par soudure ou par collage sur les plateaux.Another characteristic of the invention is that the deformable envelopes are connected by welding or by gluing on the plates.
L'invention est encore caractérisé en ce que le fluide à faible compressibilité est obtenu par le mélange d'un liquide et d'un gaz faiblement soluble dans le liquide.The invention is further characterized in that the fluid with low compressibility is obtained by mixing a liquid and a gas sparingly soluble in the liquid.
Enfin, I'invention prévoit que les deux capsules peuvent être reliées par l'intermédiaire de leurs plateaux, les deux plateaux possédant les conduits étant reliés rigidement ensembles, les deux plateaux sans conduit étant reliés rigidement ensembles, et que les conduits peuvent être réunis pour assurer l'intercommunication libre des deux enceintes.Finally, the invention provides that the two capsules can be connected by means of their trays, the two trays having the conduits being rigidly connected together, the two trays without conduits being rigidly connected together, and that the conduits can be joined together to ensure free intercommunication between the two speakers.
II est décrit ci-après en référence aux dessins annexés une forme préférentielle de l'invention. A preferred form of the invention is described below with reference to the accompanying drawings.
La figure 1 représente une capsule après coupe dans le plan transversal.Figure 1 shows a capsule after cutting in the transverse plane.
La figure 2 représente deux capsules comportant des plateaux reliés rigidement.FIG. 2 represents two capsules comprising plates rigidly connected.
En référence à la figure 1, I'ensemble d'une capsule 1 est constitué de deux plateaux 2 et 3 ayant la forme de disques à faces parallèles d'axe 4, munis de moyens d'ancrage connus en soi (non représentés) pour assurer la cohésion avec les plateaux vertébraux des vertèbres adjacentes et réunis par une enveloppe déformable 5 constituée de deux parois 5e et 5f de forme générale cylindrique à base circulaire d'axe 4 au moyen des collerettes 5a et 5b raccordées sur les plateaux constituant ainsi une enceinte étanche de volume 10. La déformation de l'enveloppe dans le sens préférentiel de la direction de l'axe 4 est obtenu de manière connue en soi par un formage en ondes 5c de la paroi intérieure et en une onde unique de la paroi extérieure. La géométrie de l'enveloppe ainsi obtenue autorise à la fois une variation de l'espace entre les plateaux 2, 3 et une variation angulaire entre ces mêmes plateaux qui peuvent alors supporter un non parallélisme. Les matériaux utilisés doivent évidemment être biocompatibles, tels les alliages inoxydables 316 LVM, les alliages titanevanadium-aluminium ou cobalt-chrome.With reference to FIG. 1, the whole of a capsule 1 consists of two plates 2 and 3 having the form of discs with parallel faces of axis 4, provided with anchoring means known per se (not shown) for ensuring cohesion with the vertebral plates of the adjacent vertebrae and joined by a deformable envelope 5 consisting of two walls 5e and 5f of generally cylindrical shape with circular base of axis 4 by means of the flanges 5a and 5b connected to the plates thus constituting an enclosure leaktight in volume 10. The deformation of the envelope in the preferred direction of the direction of the axis 4 is obtained in a manner known per se by forming the interior wall in waves 5c and in a single wave of the exterior wall. The geometry of the envelope thus obtained allows both a variation of the space between the plates 2, 3 and an angular variation between these same plates which can then support non-parallelism. The materials used must obviously be biocompatible, such as the 316 LVM stainless alloys, the titanevanadium-aluminum or cobalt-chrome alloys.
De manière à soulager l'enveloppe d'une contrainte de cisaillement transversal qui résulterait du déplacement relatif des plateaux parallèlement à leurs faces dans des direction opposées, le plateau 2 est muni d'une tige cylindrique 6 se terminant par une rotule 7 d'axe 4 dont le diamètre est supérieur au diamètre de la tige 6, la rotule 7 coopérant avec le logement cylindrique 8 d'axe 4 attenant au plateau 3. Ce dispositif anti cisaillement autorise une variation de la distance des plateaux 2 et 3 dont le minimum est imposé par le choix de la distance D entre la rotule 7 et le fond du logement 8. Il autorise également tout mouvement de rotation autour du centre 7a de la rotule 7. La conjugaison de ces mouvements permet d'accompagner le déplacement relatif des vertèbres adjacentes.Le dispositif anti cisaillement étant logé à l'intérieur de l'enceinte étanche 10, les particules qui résulteront de l'usure inévitable du dispositif ne peuvent pas être disséminées dans le corps. Dans une autre forme possible de l'invention, la rotule est remplacée par un corps cylindrique coopérant avec le logement 8 un jeu radial étant prévu entre le corps cylindrique et le logement pour autoriser les débattements angulaires entre les deux plateaux
Pour permettre à l'ensemble des deux capsules de supporter les efforts de compression qui tendent à rapprocher les deux vertèbres adjacentes et d'accompagner les écarts angulaires apparaissant entre les plateaux vertébraux, le volume 10 est rempli d'un fluide à faible compressibilité permettant de restituer la fonction d'absorption des chocs assurée par le disque intervertébral sain et de permettre une variation de distance entre les plateaux 2 et 3. Le taux de compressibilité est contrôlé par la proportion du mélange d'un liquide et d'un gaz non soluble dans le liquide.In order to relieve the envelope of a transverse shearing stress which would result from the relative displacement of the plates parallel to their faces in opposite directions, the plate 2 is provided with a cylindrical rod 6 ending in a ball joint 7 of axis 4, the diameter of which is greater than the diameter of the rod 6, the ball joint 7 cooperating with the cylindrical housing 8 of axis 4 adjoining the plate 3. This anti-shearing device allows a variation in the distance of the plates 2 and 3, the minimum of which is imposed by the choice of the distance D between the ball joint 7 and the bottom of the housing 8. It also allows any rotational movement around the center 7a of the ball joint 7. The combination of these movements makes it possible to accompany the relative displacement of the adjacent vertebrae The anti-shearing device being housed inside the sealed enclosure 10, the particles which will result from the inevitable wear of the device cannot be disseminated d in the body. In another possible form of the invention, the ball joint is replaced by a cylindrical body cooperating with the housing 8, a radial clearance being provided between the cylindrical body and the housing to allow angular deflections between the two plates
To allow all of the two capsules to withstand the compression forces which tend to bring the two adjacent vertebrae closer and to accompany the angular differences appearing between the vertebral plates, the volume 10 is filled with a fluid with low compressibility making it possible to restore the shock absorption function provided by the healthy intervertebral disc and allow a variation in distance between the plates 2 and 3. The compressibility rate is controlled by the proportion of the mixture of a liquid and an insoluble gas in the liquid.
Le plateau 2 comprend un conduit 9 dont l'extrémité débouchant sur l'extérieur est fermée par un bouchon 14. Le conduit 9 débouche dans le volume 10 par un orifice 11. Entre l'orifice 1 1 et le bouchon 14 est placé une bille 1 2 poussée par un ressort 13 sur un siège 12a, I'ensemble constituant un clapet anti retour interdisant au fluide contenu dans le volume 10 de s'évacuer lorsqu'on retire le bouchon 14. Un dispositif (non représenté) d'introduction ou d'évacuation du liquide ou du gaz contenu dans le volume 10 se fixe en lieu et place du bouchon 14 et comprend une protubérance écartant la bille 12 de son siège 12a, neutralisant ainsi la fonction anti retour.The plate 2 comprises a conduit 9, the end of which opens to the outside is closed by a plug 14. The conduit 9 opens into the volume 10 through an orifice 11. Between the orifice 1 1 and the plug 14 is placed a ball 1 2 pushed by a spring 13 on a seat 12a, the assembly constituting a non-return valve preventing the fluid contained in the volume 10 from being evacuated when the plug 14 is removed. A device (not shown) for introducing or evacuation of the liquid or gas contained in the volume 10 is fixed in place of the plug 14 and includes a protrusion separating the ball 12 from its seat 12a, thus neutralizing the anti-return function.
La figure 2 montre les deux capsules reliées rigidement par leurs plateaux homologues. La liaison peut être démontable par des moyens connus non représentés. Un conduit 1 7a réuni les deux conduits 1 7 et 1 7b assurant ainsi l'intercommunication des volumes 1 6 et 1 6a par l'intermédiaire des orifices 1 5 et 1 Sa. Après remplissage par le fluide faiblement compressible, la fonction amortisseur de choc est conservée alors que le débattement angulaire relatif des plateaux dans le sens transversal est augmenté par rapport à ce qui est obtenu avec deux capsules indépendantes.Figure 2 shows the two capsules rigidly connected by their counterparts. The connection can be dismantled by known means, not shown. A conduit 1 7a joins the two conduits 1 7 and 1 7b thus ensuring the intercommunication of the volumes 1 6 and 1 6a via the orifices 1 5 and 1 Sa. After filling with the weakly compressible fluid, the shock absorbing function is retained while the relative angular movement of the plates in the transverse direction is increased compared to what is obtained with two independent capsules.
Deux capsules, reliées ou non, sont mises en place entre les plateaux vertébraux de façon symétrique au plan sagittal médian des vertèbres. Pour faciliter cette introduction, le volume 10 est partiellement rempli de fluide faiblement compressible. Après mise en place, le complément de fluide est introduit, restituant ainsi l'espace intervertébrale et assurant l'ancrage des plateaux dans les vertèbres. La présence de la paroi extérieure 5e protège les tissus environnants des détériorations qui pourraient être provoquées par le rapprochement des ondes 5c au cours de la déformation de l'enveloppe 5 et des projections de fluide qui pourraient résulter d'une fuite dans la paroi intérieure.Two capsules, connected or not, are placed between the vertebral plates symmetrically to the median sagittal plane of the vertebrae. To facilitate this introduction, the volume 10 is partially filled with weakly compressible fluid. After placement, the additional fluid is introduced, thus restoring the intervertebral space and ensuring the anchoring of the plates in the vertebrae. The presence of the outer wall 5e protects the surrounding tissues from damage which could be caused by the bringing together of the waves 5c during the deformation of the envelope 5 and from the projections of fluid which could result from a leak in the inner wall.
La paroi intérieure assure la résistance aux pressions régnant dans le volume 10 en fonctionnement et est réalisée dans un matériau plus résistant que la paroi extérieure qui n'a qu'un rôle d'écran. The inner wall ensures resistance to the pressures prevailing in the volume 10 in operation and is made of a more resistant material than the outer wall which has only a screen role.
Claims (13)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR9410201A FR2723841B1 (en) | 1994-08-23 | 1994-08-23 | INTERVERTEBRAL DISK PROSTHESIS. |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR9410201A FR2723841B1 (en) | 1994-08-23 | 1994-08-23 | INTERVERTEBRAL DISK PROSTHESIS. |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| FR2723841A1 true FR2723841A1 (en) | 1996-03-01 |
| FR2723841B1 FR2723841B1 (en) | 1998-11-06 |
Family
ID=9466435
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| FR9410201A Expired - Lifetime FR2723841B1 (en) | 1994-08-23 | 1994-08-23 | INTERVERTEBRAL DISK PROSTHESIS. |
Country Status (1)
| Country | Link |
|---|---|
| FR (1) | FR2723841B1 (en) |
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Also Published As
| Publication number | Publication date |
|---|---|
| FR2723841B1 (en) | 1998-11-06 |
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