WO1997032533A1 - Spinal osteosynthesis device - Google Patents

Spinal osteosynthesis device Download PDF

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Publication number
WO1997032533A1
WO1997032533A1 PCT/FR1996/002074 FR9602074W WO9732533A1 WO 1997032533 A1 WO1997032533 A1 WO 1997032533A1 FR 9602074 W FR9602074 W FR 9602074W WO 9732533 A1 WO9732533 A1 WO 9732533A1
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WO
WIPO (PCT)
Prior art keywords
rod
spinal osteosynthesis
portions
frustoconical
diameter
Prior art date
Application number
PCT/FR1996/002074
Other languages
French (fr)
Inventor
Gilles Colnet
Original Assignee
Neurofix
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Neurofix filed Critical Neurofix
Priority to EP96943190A priority Critical patent/EP0884979A1/en
Priority to AU11992/97A priority patent/AU1199297A/en
Publication of WO1997032533A1 publication Critical patent/WO1997032533A1/en

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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
    • 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

Definitions

  • the invention relates to a device for spinal osteosynthesis.
  • more or less rigid rods are used for this purpose, the length of which depends on the height and the number of vertebrae to be fixed, said rods making it possible to connect vertebral anchoring systems, such as hooks , pedicle plates and screws, the latter being implanted in the pedicles of the vertebrae concerned.
  • the invention therefore proposes a simple spinal osteosynthesis device, using a rod with variable flexibility associated with vertebral anchoring systems, and the flexibility of which varies according to the place of fixation.
  • This variation in flexibility being obtained by a constant variation in the diameter of said rod at least at one of its portions. In this way a flexibility gradient is generated.
  • the principle of varying the diameter of the rod is known.
  • a segmental rod of different diameters has been described.
  • the rod according to the invention has, on the contrary, a constant and linear variation in its diameter, resulting in an increase in the resistance of said rod to rupture, by the elimination of any zones of weakness inherent in a sudden and discreet variation in the diameter, as described in these two documents.
  • the variation in diameter is not only continuous but linear, so that the general profile of the rod can be frustoconical, or even be constituted by an assembly of one or two truncated cones, with or without the intermediary of a cylindrical area.
  • the rod may have at least one flat, suitable for optimizing the blocking against rotation of the rod, and therefore improve the locking of the rod with the vertebral anchoring elements.
  • Figure 1 is a schematic representation seen from above of a first embodiment of the rod according to the invention, of which Figure 2 is a schematic perspective representation.
  • Figure 3 is a schematic representation seen from above of another embodiment of the invention.
  • Figure 4 is a schematic perspective representation of another embodiment of the invention.
  • Figure 5 is a schematic representation of the lumbar spine, provided with two rods according to the first embodiment of the invention.
  • FIG. 6 is a representation of the lumbosacral spine using rods in accordance with FIG. 3.
  • FIG. 7 is a schematic perspective representation of a variant of the rod of FIG. 1.
  • FIG. 8 is a schematic representation seen from above of a variant of the rod of FIG. 4.
  • This rod (1) typically made of metal or composite material, in particular by machining, has a symmetry of revolution. Although one piece, it in fact has two parts in the example described, symmetrical (2) and (3), each consisting of a truncated cone, the junction zone (6) of said parts (2) and (3) corresponding at their widest base and as a corollary, at the largest diameter P_.
  • the ends (4) and (5) of the rod (1) have a diameter d . less than D. .
  • d 3.5 mm
  • D 5 mm.
  • the variation in diameter from the junction zone (6) towards the ends (4) and (5) is constant, continuous and linear.
  • the generatrices of parts (2) and (3) are formed by straight lines.
  • FIG. 2 shows a perspective view illustrating these different characteristics.
  • Such a rod can be placed for example at the level of the lumbar spine as shown in FIG. 5.
  • These rods (1) are fixed at the level of the pedicles of lumbar vertebrae (9) (or dorsal in the in the case of mounting in the thoracic zone) by means of pedicle screws (10) or hooks, in a known manner.
  • the rod of FIGS. 1 and 2 also comprises a cylindrical junction zone (11), the diameter of which corresponds to the diameter D of the base (12) and (13) of the truncated cones constituting the parts ( 2) and (3) of the rod (1).
  • the rod while having a symmetry of revolution, is either only frustoconical and consists of a single part, or is constituted of two parts comprising a frustoconical part connected to a cylindrical part at its end of larger diameter P_.
  • One of the ends (7) corresponding to the base of the truncated cone has a larger diameter D_ than the other end (8) of diameter d.
  • Such a rod, the flexibility of which is greater at one end (8) than at the other end (7) is more particularly intended to be placed at the lumbosacral spine, such as shown in figure 6.
  • the end (7) with diameter D is always fixed by means of pedicle screws (10) or plates at the sacrum (14), the other end (8) being fixed at the lumbar vertebrae by means pedicle screws or hooks, the variation in flexibility of the rod making it possible to protect the disc adjacent to the last proximal vertebra fixed by the material.
  • the rod has over its entire length, a flat (15).
  • This flat does not alter the principle of variable flexibility of the rod, and it also makes it possible to optimize the locking of said rod at the level of the vertebral anchoring systems.
  • the virtual diameter of the rod also has a constant variation.

Abstract

A spinal osteosynthesis device including a rigid shaft (1) for interconnecting vertebral anchoring systems (10) adjacent to the spine, said shaft having at least one portion with a constantly and continuously varying diameter, whereby it has a flexibility gradient.

Description

DISPOSITIF POUR OSTEOSYNTHESE RACHIDIENNE.DEVICE FOR SPINAL OSTEOSYNTHESIS.
L'invention concerne un dispositif pour ostéosynthèse rachidienne.The invention relates to a device for spinal osteosynthesis.
De nombreuses pathologies du rachis nécessitent la mise en place d'implants, destinés soit à corriger des déformations, soit à stabiliser le rachis.Many spinal pathologies require the placement of implants, intended either to correct deformities or to stabilize the spine.
De manière connue, on utilise à cette fin des tiges plus ou moins rigides, généralement cylindriques, dont la longueur est fonction de la hauteur et du nombre des vertèbres à fixer, lesdites tiges permettant de relier des systèmes d'ancrage vertébral, tels que crochets, plaques et vis pédiculaires, ces dernières étant implantées dans les pédicules des vertèbres concernées.In known manner, more or less rigid rods, generally cylindrical, are used for this purpose, the length of which depends on the height and the number of vertebrae to be fixed, said rods making it possible to connect vertebral anchoring systems, such as hooks , pedicle plates and screws, the latter being implanted in the pedicles of the vertebrae concerned.
L'expérience montre que plus l'ostéosynthèse est longue, c'est à dire plus le nombre de vertèbres réunies est important, plus les contraintes aux extrémités du montage augmentent, aboutissant d'une part, à un risque de dégénérescence des disques intervertébraux immédiatement adjacents aux dernières vertèbres synthèsées, et d'autre part, à des risques de rupture ou d'arrachage du matériel concerné.Experience shows that the longer the osteosynthesis, that is to say the greater the number of vertebrae united, the more the stresses at the ends of the assembly increase, leading on the one hand to a risk of degeneration of the intervertebral discs immediately adjacent to the last synthesized vertebrae, and secondly, at risk of rupture or tearing of the material concerned.
Afin de s'affranchir de ces inconvénients, on a proposé d'augmenter la taille des implants. Cependant, une telle augmentation des composants des dispositifs d'ostéosynthèse peut induire des problèmes liés à l'encombrement ou à la rigidité de ces composants.In order to overcome these drawbacks, it has been proposed to increase the size of the implants. However, such an increase in the components of the osteosynthesis devices can induce problems linked to the size or the rigidity of these components.
Par ailleurs, on a également proposé de diminuer la taille des tiges pour limiter les contraintes. Ce type de montage ne permettant pas de fixer de façon suffisamment solide certains niveaux intermédiaires, oblige à mettre en place deux tiges de petit diamètre, afin d'augmenter la stabilité du montage. Dans d'autres cas, on a proposé de faire appel à des systèmes souples, typiquement constitués par une ligamentoplastie, du type de celle décrite dans le document EP-A-0 478 470. Cependant, si par l'utilisation de tels systèmes, on diminue de manière significative les problèmes de dégénérescence de , disques liés aux contraintes excessives exercées au niveau des extrémités du montage, ces ligamentoplasties permettent de ne traiter qu'une partie réduite des pathologies du rachis, ne nécessitant pas une immobilisation stricte des vertèbres concernées.Furthermore, it has also been proposed to reduce the size of the rods to limit the stresses. This type of assembly does not make it possible to fix certain intermediate levels in a sufficiently solid manner, obliges to install two rods of small diameter, in order to increase the stability of the assembly. In other cases, it has been proposed to use flexible systems, typically constituted by ligamentoplasty, of the type described in document EP-A-0 478 470. However, if by the use of such systems, the problems of degeneration of discs are significantly reduced, discs linked to the excessive stresses exerted at the ends of the assembly, these ligamentoplasties make it possible to treat only a reduced part of the pathologies of the spine, not requiring a strict immobilization of the vertebrae concerned.
Certains montages utilisant des plaques plus ou moins rigides associées à des ligaments au niveau de leurs extrémités ont également été exploités. Ces associations de systèmes sont coûteuses et s'avèrent d'une utilisation peu pratique, nécessitant la disponibilité de plusieurs types de matériels.Some arrangements using more or less rigid plates associated with ligaments at their ends have also been exploited. These combinations of systems are expensive and prove to be impractical to use, requiring the availability of several types of equipment.
Afin de pallier ces inconvénients, l'invention propose donc un dispositif d'ostéosynthèse rachidienne simple, mettant en oeuvre une tige à flexibilité variable associée à des systèmes d'ancrage vertébral, et dont la flexibilité varie en fonction du lieu de fixation. Cette variation de flexibilité étant obtenue par une variation constante du diamètre de ladite tige au moins au niveau de l'une de ses portions. On génère de la sorte un gradient de flexibilité.In order to overcome these drawbacks, the invention therefore proposes a simple spinal osteosynthesis device, using a rod with variable flexibility associated with vertebral anchoring systems, and the flexibility of which varies according to the place of fixation. This variation in flexibility being obtained by a constant variation in the diameter of said rod at least at one of its portions. In this way a flexibility gradient is generated.
Le principe d'une variation de diamètre de la tige est connu. On a par exemple décrit dans les document EP-A-0 612 507 et US-A-5 217 461, une tige segmentaire de différents diamètres. La tige selon l'invention présente au contraire une variation constante et linéaire de son diamètre, se traduisant par une augmentation de la résistance de ladite tige à la rupture, de par la suppression de toute zones de faiblesse inhérentes à une variation brutale et discrète du diamètre, telle que décrite dans ces deux documents. Comme déjà précisé, la variation du diamètre est non seulement continue mais linéaire, de sorte que le profil général de la tige peut être tronconique, voire être constitué par un assemblage d'un ou de deux troncs de cône, avec ou sans l'intermédiaire d'une zone cylindrique.The principle of varying the diameter of the rod is known. For example, in EP-A-0 612 507 and US-A-5 217 461, a segmental rod of different diameters has been described. The rod according to the invention has, on the contrary, a constant and linear variation in its diameter, resulting in an increase in the resistance of said rod to rupture, by the elimination of any zones of weakness inherent in a sudden and discreet variation in the diameter, as described in these two documents. As already specified, the variation in diameter is not only continuous but linear, so that the general profile of the rod can be frustoconical, or even be constituted by an assembly of one or two truncated cones, with or without the intermediary of a cylindrical area.
Par ailleurs, la tige peut présenter au moins un méplat, propre à optimiser le blocage contre la rotation de la tige, et partant, améliorer le verrouillage de la tige avec les éléments d'ancrage vertébral.Furthermore, the rod may have at least one flat, suitable for optimizing the blocking against rotation of the rod, and therefore improve the locking of the rod with the vertebral anchoring elements.
La manière dont l'invention peut être réalisée et les avantages qui en découlent ressortiront mieux des exemples de réalisation qui suivent donnés à titre indicatif et non limitatif à l'appui des figures annexées.The manner in which the invention can be implemented and the advantages which ensue therefrom will emerge more clearly from the following exemplary embodiments given by way of indication and without limitation in support of the attached figures.
La figure 1 est une représentation schématique vue du dessus d'une première forme de réalisation de la tige conforme à l'invention, dont la figure 2 est une représentation schématique en perspective.Figure 1 is a schematic representation seen from above of a first embodiment of the rod according to the invention, of which Figure 2 is a schematic perspective representation.
La figure 3 est une représentation schématique vue du dessus d'une autre forme de réalisation de l'invention.Figure 3 is a schematic representation seen from above of another embodiment of the invention.
La figure 4 est une représentation schématique en perspective d'une autre forme de réalisation de l'invention.Figure 4 is a schematic perspective representation of another embodiment of the invention.
La figure 5 est une représentation schématique du rachis lombaire, muni de deux tiges selon la première forme de réalisation de l'invention.Figure 5 is a schematic representation of the lumbar spine, provided with two rods according to the first embodiment of the invention.
La figure 6 est une représentation du rachis lombo-sacré mettant en oeuvre des tiges conformes à la figure 3.FIG. 6 is a representation of the lumbosacral spine using rods in accordance with FIG. 3.
La figure 7 est une représentation schématique en perspective d'une variante de la tige de la figure 1.FIG. 7 is a schematic perspective representation of a variant of the rod of FIG. 1.
La figure 8 est une représentation schématique vue du dessus d'une variante de la tige de la figure 4. On a représenté sur les figures 1 et 2 une première forme de réalisation de la tige conforme à l'invention. Cette tige (1), typiquement réalisée en métal ou en matériau composite, notamment par usinage, présente une symétrie de révolution. Bien que monobloc, elle présente en fait deux parties dans l'exemple décrit, symétriques (2) et (3), constituées chacune par un tronc de cône, la zone de jonction (6) desdites parties (2) et (3) correspondant à leur base la plus large et corollairement, au diamètre P_ le plus important.FIG. 8 is a schematic representation seen from above of a variant of the rod of FIG. 4. There is shown in Figures 1 and 2 a first embodiment of the rod according to the invention. This rod (1), typically made of metal or composite material, in particular by machining, has a symmetry of revolution. Although one piece, it in fact has two parts in the example described, symmetrical (2) and (3), each consisting of a truncated cone, the junction zone (6) of said parts (2) and (3) corresponding at their widest base and as a corollary, at the largest diameter P_.
Ainsi qu'on peut l'observer, les extrémités (4) et (5) de la tige (1) présentent un diamètre d. inférieur à D.. Par exemple, dans le cadre d'un montage trois niveaux, comportant une tige de longueur de 80 mm, d = 3,5 mm et D = 5 mm.As can be observed, the ends (4) and (5) of the rod (1) have a diameter d . less than D. . For example, in the context of a three-level assembly, comprising a rod with a length of 80 mm, d = 3.5 mm and D = 5 mm.
Ainsi qu'on peut l'observer, la variation de diamètre de la zone de jonction (6) vers les extrémités (4) et (5) est constante, continue et linéaire. En d'autres termes, les génératrices des parties (2) et (3) sont constituées par des droites.As can be observed, the variation in diameter from the junction zone (6) towards the ends (4) and (5) is constant, continuous and linear. In other words, the generatrices of parts (2) and (3) are formed by straight lines.
On s'affranchit de la sorte de toute variation brutale dudit diamètre, et partant de zones de moindre résistance susceptibles de présenter des risques de rupture.In this way, any brutal variation of said diameter is avoided, and starting from zones of weaker resistance likely to present risks of rupture.
On a représenté sur la figure 2 une vue en perspective illustrant ces différentes caractéristiques.FIG. 2 shows a perspective view illustrating these different characteristics.
Une telle tige peut être mise en place par exemple au niveau du rachis lombaire ainsi qu'on l'a représentée sur la figure 5. Ces tiges (1) sont fixées au niveau des pédicules de vertèbres lombaires (9) (ou dorsales dans le cas d'un montage en zone thoracique) au moyen de vis pédiculaires (10) ou de crochets, et ce, de manière connue. Dans l'exemple décrit, la tige des figures 1 et 2 comporte en outre une zone de jonction cylindrique (11 ), dont le diamètre correspond au diamètre D de la base (12) et (13) des troncs de cône constitutifs des parties (2) et (3) de la tige (1).Such a rod can be placed for example at the level of the lumbar spine as shown in FIG. 5. These rods (1) are fixed at the level of the pedicles of lumbar vertebrae (9) (or dorsal in the in the case of mounting in the thoracic zone) by means of pedicle screws (10) or hooks, in a known manner. In the example described, the rod of FIGS. 1 and 2 also comprises a cylindrical junction zone (11), the diameter of which corresponds to the diameter D of the base (12) and (13) of the truncated cones constituting the parts ( 2) and (3) of the rod (1).
De la sorte, de par la diminution du diamètre de la tige ainsi constituée en direction des extrémités, on aboutit au niveau des zones de points d'ancrage vertébral (10) des extrémités du montage à une augmentation locale de flexibilité, et de ce fait à une diminution de la rigidité. Ceci permet de réduire les contraintes exercées au niveau des vis pédiculaires les plus proximales et les plus distales, ainsi qu'au niveau des disques adjacents aux dernières vertèbres synthèsées, tout en obtenant une bonne stabilisation locale du rachis.In this way, due to the reduction in the diameter of the rod thus formed in the direction of the ends, there is obtained at the level of the vertebral anchor point areas (10) of the ends of the assembly, a local increase in flexibility, and therefore a decrease in rigidity. This makes it possible to reduce the stresses exerted at the level of the most proximal and the most distal pedicle screws, as well as at the level of the discs adjacent to the last synthesized vertebrae, while obtaining good local stabilization of the spine.
Par ailleurs, de par l'absence de discontinuité au niveau des variations du diamètre, on élimine l'occurence de tout point de rupture et partant, on augmente la stabilité dans le temps d'un tel dispositif d'ostéosyn thèse.In addition, by the absence of discontinuity at the level of the variations of the diameter, one eliminates the occurrence of any point of rupture and consequently, one increases the stability in time of such a device of osteosyn thesis.
On a représenté en liaison avec les figures 3, 4 et 6, une autre forme de réalisation de l'invention dans laquelle la tige, tout en présentant une symétrie de révolution, est soit uniquement tronconique et constituée d'une seule partie, soit constituée de deux parties comportant une partie tronconique raccordée à une partie cylindrique au niveau de son extrémité de plus grand diamètre P_. L'une des extrémités (7) correspondant à la base du tronc de cône présente un diamètre D_ plus important que l'autre extrémité (8) de diamètre d. Par exemple, dans le cadre d'un montage pour arthrodèse lombo-sacrée L4-S1, la tige présente une longueur de 80 mm, avec D = 5 mm et d = 3,5 mm. Une telle tige, dont la flexibilité est plus importante au niveau d'une extrémité (8) qu'au niveau de l'autre extrémité (7) est plus particulièrement destinée à être mise en place au niveau du rachis lombo - sacré, tel que représenté sur la figure 6.Is shown in connection with Figures 3, 4 and 6, another embodiment of the invention in which the rod, while having a symmetry of revolution, is either only frustoconical and consists of a single part, or is constituted of two parts comprising a frustoconical part connected to a cylindrical part at its end of larger diameter P_. One of the ends (7) corresponding to the base of the truncated cone has a larger diameter D_ than the other end (8) of diameter d. For example, in the context of a lumbosacral arthrodesis assembly L4-S1, the rod has a length of 80 mm, with D = 5 mm and d = 3.5 mm. Such a rod, the flexibility of which is greater at one end (8) than at the other end (7) is more particularly intended to be placed at the lumbosacral spine, such as shown in figure 6.
De fait, l'extrémité (7) à diamètre D est fixée toujours au moyen de vis pédiculaires (10) ou de plaques au niveau du sacrum (14), l'autre extrémité (8) étant fixée au niveau des vertèbres lombaires au moyen de vis pédiculaires ou de crochets, la variation de flexibilité de la tige permettant de protéger le disque adjacent à la dernière vertèbre proximale fixée par le matériel.In fact, the end (7) with diameter D is always fixed by means of pedicle screws (10) or plates at the sacrum (14), the other end (8) being fixed at the lumbar vertebrae by means pedicle screws or hooks, the variation in flexibility of the rod making it possible to protect the disc adjacent to the last proximal vertebra fixed by the material.
On a représenté en liaison avec les figures 7 et 8 une variante de l'invention, dans laquelle, la tige présente sur toute sa longueur, un méplat (15). Ce méplat n'altère en rien le principe de flexibilité variable de la tige, et il permet en outre d'optimiser le verrouillage de ladite tige au niveau des systèmes d'ancrage vertébral. Par ailleurs, le diamètre virtuel de la tige présente également une variation constante.There is shown in connection with Figures 7 and 8 a variant of the invention, in which, the rod has over its entire length, a flat (15). This flat does not alter the principle of variable flexibility of the rod, and it also makes it possible to optimize the locking of said rod at the level of the vertebral anchoring systems. Furthermore, the virtual diameter of the rod also has a constant variation.
il ressort de la présente invention un certain nombre d'avantages parmi lesquels on peut citer, outre une meilleure adaptation du dispositif d'ostéosynthèse rachidienne à la biomécanique du rachis, également une meilleure résistance dans le temps des matériels mis en oeuvre, de même qu'une diminution, voire une absence de dégénérescence des disques intervertébraux et leurs corollaires, les douleurs qu'elle engendre. It emerges from the present invention a number of advantages among which we can cite, in addition to a better adaptation of the spinal osteosynthesis device to the biomechanics of the spine, also better resistance over time of the materials used, as well as '' a decrease, even an absence of degeneration of the intervertebral discs and their corollaries, the pain it causes.

Claims

REVENDICATIONS
1 / Dispositif pour ostéosynthèse rachidienne comprenant une tige (1) rigide, destinée à relier des systèmes d'ancrage vertébral (10) mis en place au niveau du rachis, caractérisé en ce que la tige présente au moins une portion dont le diamètre varie de manière constante et continue, de telle sorte à présenter un gradient de flexibilité.1 / Device for spinal osteosynthesis comprising a rigid rod (1), intended to connect vertebral anchoring systems (10) set up at the level of the spine, characterized in that the rod has at least one portion whose diameter varies from constantly and continuously, so as to present a flexibility gradient.
2/ Dispositif pour ostéosynthèse rachidienne selon la revendication 1, caractérisé en ce que les portions de la tige (1) dont le diamètre varie de manière constante et continue représentent la plus grande partie de la longueur de la tige.2 / Device for spinal osteosynthesis according to claim 1, characterized in that the portions of the rod (1) whose diameter varies constantly and continuously represent the largest part of the length of the rod.
3/ Dispositif pour ostéosynthèse rachidienne selon l'une des revendications 1 et 2, caractérisé en ce que la tige (1) est de forme tronconique.3 / Device for spinal osteosynthesis according to one of claims 1 and 2, characterized in that the rod (1) is of frustoconical shape.
4/ Dispositif pour ostéosynthèse rachidienne selon l'une des revendications 1 et 2, caractérisé en ce que la tige est de forme bi- tronconique, ladite tige comprenant deux portions (2) et (3) raccordée au niveau de leur base (6) de plus grand diamètre.4 / Device for spinal osteosynthesis according to one of claims 1 and 2, characterized in that the rod is of bi-frustoconical shape, said rod comprising two portions (2) and (3) connected at their base (6) larger diameter.
5/ Dispositif pour ostéosynthèse rachidienne selon l'une des revendications 1 et 2, caractérisé en ce que la tige (1) comporte trois portions, respectivement deux portions tronconiques raccordées entre elles au moyen d'une portion cylindrique (11), les portions tronconiques étant raccordées à la portion cylindrique (11) au niveau de leur base de plus grand diamètre (12, 13). 6/ Dispositif pour ostéosynthèse rachidienne selon l'une des revendications 1 et 2, caractérisé en ce que la tige (1) comporte deux portions, respectivement un portion tronconique et une portion cylindrique, lesdites portions étant raccordées au niveau de la base de plus grand diamètre de la portion tronconique.5 / Device for spinal osteosynthesis according to one of claims 1 and 2, characterized in that the rod (1) has three portions, respectively two frustoconical portions connected together by means of a cylindrical portion (11), the frustoconical portions being connected to the cylindrical portion (11) at their larger diameter base (12, 13). 6 / Device for spinal osteosynthesis according to one of claims 1 and 2, characterized in that the rod (1) comprises two portions, respectively a frustoconical portion and a cylindrical portion, said portions being connected at the level of the base of larger diameter of the frustoconical portion.
7/ Dispositif pour ostéosynthèse rachidienne selon l'une des revendications 1 à 6, caractérisé en ce que la tige (1) présente sur toute sa longueur, au moins un méplat (15), destiné à optimiser le verrouillage de ladite tige au niveau des systèmes d'ancrage vertébral. 7 / Device for spinal osteosynthesis according to one of claims 1 to 6, characterized in that the rod (1) has over its entire length, at least one flat (15), intended to optimize the locking of said rod at the vertebral anchoring systems.
PCT/FR1996/002074 1996-03-05 1996-12-24 Spinal osteosynthesis device WO1997032533A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP96943190A EP0884979A1 (en) 1996-03-05 1996-12-24 Spinal osteosynthesis device
AU11992/97A AU1199297A (en) 1996-03-05 1996-12-24 Spinal osteosynthesis device

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9602994A FR2745707B1 (en) 1996-03-05 1996-03-05 SPINAL OSTEOSYNTHESIS DEVICE
FR96/02994 1996-03-05

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WO1997032533A1 true WO1997032533A1 (en) 1997-09-12

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AU (1) AU1199297A (en)
FR (1) FR2745707B1 (en)
WO (1) WO1997032533A1 (en)

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EP1613224A2 (en) * 2003-04-04 2006-01-11 Stephen Ritland Dynamic fixation device and method of use
WO2008039222A1 (en) * 2006-09-25 2008-04-03 Stryker Spine Rod inserter and rod with reduced diameter end
CH702636A1 (en) * 2010-02-04 2011-08-15 Spinesave Ag Point-symmetric plastic rod for surgical treatment of spinal column to dynamically stabilize spinal column, has two regions with different rigidities in longitudinal direction and connected with each other by adhesives, welds or combination
WO2012024807A1 (en) 2010-08-26 2012-03-01 Spinesave Ag Spinal implant set for the dynamic stabilization of the spine
US8657856B2 (en) 2009-08-28 2014-02-25 Pioneer Surgical Technology, Inc. Size transition spinal rod
US8690922B2 (en) 2002-05-08 2014-04-08 Stephen Ritland Dynamic fixation device and method of use
CN103892897A (en) * 2012-12-27 2014-07-02 藏磊 Internal fixation orthosis for growing stage scoliosis
US8845694B2 (en) 2005-07-19 2014-09-30 Warsaw Orthopedic, Inc. Rod extension for extending fusion construct
US8974499B2 (en) 2005-02-22 2015-03-10 Stryker Spine Apparatus and method for dynamic vertebral stabilization
US9017384B2 (en) 2008-05-13 2015-04-28 Stryker Spine Composite spinal rod
US9445846B2 (en) 2005-10-31 2016-09-20 Stryker European Holdings I, Llc System and method for dynamic vertebral stabilization
US10695097B2 (en) 2012-07-05 2020-06-30 Spinesave Ag Elastic rod having different degrees of stiffness for the surgical treatment of the spine

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DE50300788D1 (en) * 2002-05-21 2005-08-25 Spinelab Gmbh Wabern Elastic stabilization system for spinal columns
CA2522664A1 (en) * 2003-04-15 2004-10-28 Mathys Medizinaltechnik Ag Bone fixation device

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US8690922B2 (en) 2002-05-08 2014-04-08 Stephen Ritland Dynamic fixation device and method of use
US9918744B2 (en) 2002-05-08 2018-03-20 Stephen Ritland Dynamic fixation device and method of use
US9232967B2 (en) 2002-05-08 2016-01-12 Stephen Ritland Dynamic fixation device and method of use
EP1613224A4 (en) * 2003-04-04 2008-07-09 Stephen Ritland Dynamic fixation device and method of use
EP1613224A2 (en) * 2003-04-04 2006-01-11 Stephen Ritland Dynamic fixation device and method of use
US8974499B2 (en) 2005-02-22 2015-03-10 Stryker Spine Apparatus and method for dynamic vertebral stabilization
US9486244B2 (en) 2005-02-22 2016-11-08 Stryker European Holdings I, Llc Apparatus and method for dynamic vertebral stabilization
US9949762B2 (en) 2005-02-22 2018-04-24 Stryker European Holdings I, Llc Apparatus and method for dynamic vertebral stabilization
US8845694B2 (en) 2005-07-19 2014-09-30 Warsaw Orthopedic, Inc. Rod extension for extending fusion construct
US9445846B2 (en) 2005-10-31 2016-09-20 Stryker European Holdings I, Llc System and method for dynamic vertebral stabilization
US10004539B2 (en) 2005-10-31 2018-06-26 Stryker European Holdings I, Llc System and method for dynamic vertebral stabilization
US7686809B2 (en) 2006-09-25 2010-03-30 Stryker Spine Rod inserter and rod with reduced diameter end
EP2452645A1 (en) * 2006-09-25 2012-05-16 Stryker Spine Rod inserter and rod with reduced diameter end
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US10194948B2 (en) 2006-09-25 2019-02-05 Stryker European Holdings I, Llc Rod inserter and rod with reduced diameter end
US11134990B2 (en) 2006-09-25 2021-10-05 Stryker European Operations Holdings Llc Rod inserter and rod with reduced diameter end
US9017384B2 (en) 2008-05-13 2015-04-28 Stryker Spine Composite spinal rod
US8657856B2 (en) 2009-08-28 2014-02-25 Pioneer Surgical Technology, Inc. Size transition spinal rod
CH702636A1 (en) * 2010-02-04 2011-08-15 Spinesave Ag Point-symmetric plastic rod for surgical treatment of spinal column to dynamically stabilize spinal column, has two regions with different rigidities in longitudinal direction and connected with each other by adhesives, welds or combination
US9232964B2 (en) 2010-08-26 2016-01-12 Spinesave Ag Spinal implant set for the dynamic stabilization of the spine
WO2012024807A1 (en) 2010-08-26 2012-03-01 Spinesave Ag Spinal implant set for the dynamic stabilization of the spine
US10695097B2 (en) 2012-07-05 2020-06-30 Spinesave Ag Elastic rod having different degrees of stiffness for the surgical treatment of the spine
CN103892897A (en) * 2012-12-27 2014-07-02 藏磊 Internal fixation orthosis for growing stage scoliosis

Also Published As

Publication number Publication date
FR2745707B1 (en) 1998-04-30
AU1199297A (en) 1997-09-22
EP0884979A1 (en) 1998-12-23
FR2745707A1 (en) 1997-09-12

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