FR2711909A1 - Device for straightening and bracing a spinal column - Google Patents

Device for straightening and bracing a spinal column Download PDF

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Publication number
FR2711909A1
FR2711909A1 FR9313223A FR9313223A FR2711909A1 FR 2711909 A1 FR2711909 A1 FR 2711909A1 FR 9313223 A FR9313223 A FR 9313223A FR 9313223 A FR9313223 A FR 9313223A FR 2711909 A1 FR2711909 A1 FR 2711909A1
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France
Prior art keywords
rod
branches
washer
nut
threaded
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Granted
Application number
FR9313223A
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French (fr)
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FR2711909B1 (en
Inventor
Chauvin Jean-Luc
Attali David
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Individual
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Individual
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Priority to FR9313223A priority Critical patent/FR2711909B1/en
Publication of FR2711909A1 publication Critical patent/FR2711909A1/en
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Expired - Fee Related 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
    • A61B17/7032—Screws or hooks with U-shaped head or back through which longitudinal rods pass
    • 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
    • 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
    • A61B17/7005—Parts of the longitudinal elements, e.g. their ends, being specially adapted to fit in the screw or hook heads

Abstract

It comprises a body (3b) of a screw (3) whose lateral branches (3c and 3d) are threaded internally (3h) and externally (3g) in order to immobilise a threaded connecting rod (4) by way of a threaded washer (5) surrounding the said branches and cooperating with the threads of the rod (4), a nut (6) designed to be screwed on the outside of the said branches (3c) and (3d) in order to tighten the said washer on the rod (4), and a conical plug (7) which is screwed between the said branches in order to spread them apart and to immobilise, on the one hand, the nut (7) in terms of rotation and, on the other hand, the rod (4) in terms of translation and in terms of rotation about its axis.

Description

La présente invention concerne un dispositif pour le redressement et l'étaiement d'un rachis présentant une déviation anormale. The present invention relates to a device for the straightening and shoring of a spine having an abnormal deviation.

Le redressement et l'étaiement d'un rachis sont deux opérations nécessaires en cas de fractures de vertèbres ou en cas de déviation de la colonne vertébrale résultant, par exemple, d'une scoliose ou d'une cyphose. The rectification and shoring of a spine are two operations necessary in the event of vertebral fractures or in the event of deviation of the spine resulting, for example, from scoliosis or kyphosis.

On connaît des dispositifs de ce genre qui ont fait l'objet depuis un certain nombre d'années de diverses réalisations. Devices of this type are known which have been the subject of various embodiments for a number of years.

En effet, il existe des dispositifs qui consistent à fixer des implants vissés de chaque côté de la courbure du rachis et à relier ceux-ci par au moins deux tiges parallèles aux épines dorsales pour servir d'étais. Les tiges sont introduites longitudinalement dans des rainures ménagées dans la tête des vis formant le corps des implants. Indeed, there are devices which consist in fixing implants screwed on each side of the curvature of the spine and in connecting these by at least two rods parallel to the backbones to serve as props. The rods are introduced longitudinally into grooves made in the head of the screws forming the body of the implants.

Les tiges sont bloquées dans le fond des rainures au moyen d'un écrou à filetage conique qui permet de rapprocher par déformation chaque côté de la rainure en direction du centre du corps.The rods are locked in the bottom of the grooves by means of a nut with conical thread which allows to bring together by deformation each side of the groove towards the center of the body.

D'autres dispositifs consistent en ce que les implants vissés comportent un corps pourvu d'un canal débouchant délimité latéralement par deux branches verticales et filetées extérieurement pour recevoir une tige de liaison. Ce dispositif comprend un capuchon taraudé adapté pour etre vissé sur les branches latérales afin de positionner la tige sur les implants vissés. Une vis pointeau est vissée dans un alésage taraudé ménagé dans le capuchon de manière que sa pointe vienne immobiliser la tige. Other devices consist in that the screwed implants comprise a body provided with an opening channel delimited laterally by two vertical branches and externally threaded to receive a connecting rod. This device includes a threaded cap adapted to be screwed onto the lateral branches in order to position the rod on the screwed implants. A needle screw is screwed into a threaded bore formed in the cap so that its point comes to immobilize the rod.

Les différents dispositifs de redressement et d'étaiement du rachis décrits précédemment ne permettent pas un blocage parfait en translation et en rotation de la tige de liaison par rapport aux implants vissés. En effet, dans le premier dispositif, le serrage est obtenu par le rapprochement des branches latérales de la rainure, ce qui n'empêche pas le coulissement et la rotation de la tige lors d'efforts extérieurs importants. Dans le second dispositif ci-dessus décrit, le serrage est réalisé à l'aide d'une vis-pointeau qui risque de s'endommager rapidement sous des efforts importants du fait de la faible zone d'appui sur la tige. The various devices for straightening and shoring the spine described above do not allow perfect locking in translation and in rotation of the connecting rod relative to the screwed implants. In fact, in the first device, the tightening is obtained by bringing the lateral branches of the groove closer together, which does not prevent the rod from sliding and rotating during significant external forces. In the second device described above, the tightening is carried out using a needle screw which risks being damaged quickly under significant forces due to the small bearing area on the rod.

C'est à ces inconvénients qu'entend plus particulièrement remédier la présente invention. It is these drawbacks that the present invention intends to remedy more particularly.

Le dispositif suivant la présente invention comporte au moins une vis comprenant dans sa partie supérieure deux branches latérales filetées intérieurement et extérieurement délimitant un canal ouvert pour la mise en place d'une tige de liaison filetée qui est immobilisée en translation et en rotation par l'intermédiaire d'une rondelle entourant les branches pour venir coopérer avec le filet de la tige, d'un écrou adapté pour être vissé sur l'extérieur des branches afin de serrer la rondelle sur ladite tige et d'un bouchon conique qui est vissé entre les branches pour les écarter et bloquer l'écrou. The device according to the present invention comprises at least one screw comprising in its upper part two lateral branches internally and externally threaded delimiting an open channel for the establishment of a threaded connecting rod which is immobilized in translation and in rotation by the intermediate a washer surrounding the branches to come to cooperate with the thread of the rod, a nut adapted to be screwed on the outside of the branches in order to tighten the washer on said rod and a conical plug which is screwed between the branches to spread them apart and lock the nut.

Le dessin annexé, donné à titre d'exemple, permettra de mieux comprendre l'invention, les caractéristiques qu'elle présente et les avantages qu'elle est susceptible de procurer :
Fig. 1 est une vue en perspective montrant le dispositif de redressement et d'étaiement du rachis suivant la présente invention.The appended drawing, given by way of example, will allow a better understanding of the invention, the characteristics which it presents and the advantages which it is capable of providing:
Fig. 1 is a perspective view showing the device for straightening and shoring the spine according to the present invention.

Fig. 2 est une vue en perspective éclatée illustrant les différents éléments composant le dispositif de redressement et d'étaiement. Fig. 2 is an exploded perspective view illustrating the various elements making up the straightening and shoring device.

Fig. 3 et 4 sont des coupes représentant les différents éléments du dispositif d'étaiement et de redressement assemblés pour l'immobilisation de la tige de liaison. Fig. 3 and 4 are sections representing the various elements of the shoring and straightening device assembled for immobilizing the connecting rod.

On a représenté en fig. 1 un dispositif 1 de redressement et d'étaiement d'un rachis 2. Ce dernier est généralement associé à deux dispositifs identiques placés parallèlement et de chaque côté de ses épines dorsales 2a. Chaque dispositif 1 comporte des systèmes d'ancrage sur les apophyses latérales 2b de chaque vertèbre 2c et une tige de liaison 4 en vue de soulager les disques intervertébraux 2d. Dans d'autres cas, le dispositif 1 peut être utilisé pour corriger les déformations du rachis 2 comme par exemple les cyphoses ou les scolioses. There is shown in fig. 1 a device 1 for straightening and shoring up a spine 2. The latter is generally associated with two identical devices placed in parallel and on each side of its backbones 2a. Each device 1 comprises anchoring systems on the lateral processes 2b of each vertebra 2c and a connecting rod 4 in order to relieve the intervertebral discs 2d. In other cases, the device 1 can be used to correct deformations of the spine 2, such as kyphosis or scoliosis.

Comme montré en fig. 2, le dispositif 1 comprend d'abord des vis d'ancrage 3 à filet auto-taraudant 3a surmonté d'un corps 3b formant la tête de chaque vis. Le corps 3b comprend deux branches 3c et 3d en portion de cercle qui délimitent entre elles un canal transversal 3e ouvert de part et d'autre du corps 3b et perpendiculairement à L'axe principal de la vis 3. As shown in fig. 2, the device 1 first comprises anchor screws 3 with self-tapping thread 3a surmounted by a body 3b forming the head of each screw. The body 3b comprises two branches 3c and 3d in a portion of a circle which delimit between them a transverse channel 3e open on either side of the body 3b and perpendicular to the main axis of the screw 3.

Le fond du canal 3e présente un profil en portion de cercle 3f prévu pour recevoir une tige cylindrique filetée 4. Chaque branche latérale 3c et 3d comporte des filetages extérieur 39 et intérieur 3h qui coopèrent respectivement avec les moyens de retenue pour le blocage de la tige de liaison 4 sur la vis 3. The bottom of the channel 3e has a profile in a portion of a circle 3f designed to receive a threaded cylindrical rod 4. Each lateral branch 3c and 3d has external threads 39 and internal 3h which cooperate respectively with the retaining means for blocking the rod 4 on the screw 3.

Le dispositif 1 de redressement et d'étaiement comporte pour chaque vis 3 une rondelle 5 dont l'alésage interne 5a est d'un diamètre légèrement supérieur à celui des branches latérales 3c et 3d. La rondelle 5 est pourvue de deux encoches filetées 5b et 5c qui sont alignées suivant le même axe diamétral de manière à être parallèles à L'axe de la tige de liaison 4. Les encoches 5b et 5c présentent un profil en portion de cercle dont le rayon est identique à celui de la tige 4. Les encoches 5b et 5c comportent respectivement un filetage identique dont le pas est semblable à celui de la tige de Liai son 4. The straightening and shoring device 1 comprises for each screw 3 a washer 5 whose internal bore 5a is of a diameter slightly greater than that of the lateral branches 3c and 3d. The washer 5 is provided with two threaded notches 5b and 5c which are aligned along the same diametrical axis so as to be parallel to the axis of the connecting rod 4. The notches 5b and 5c have a profile in a portion of a circle whose radius is identical to that of rod 4. The notches 5b and 5c respectively have an identical thread whose pitch is similar to that of the rod of Liai son 4.

Les moyens de retenue de la tige 4 sur la vis 3 consistent d'une part en un écrou 6 adapté pour venir se visser sur le filet extérieur 39 des branches latérales 3g et 3c du corps 3b et d'autre part en un bouchon conique fiLeté 7 qui coopère avec le filetage intérieur 3h desdites branches. Le bouchon 7 comporte une empreinte 7a à six pans creux pour son entrainement en rotation au moyen d'une clé mâle à six pans. The means for retaining the rod 4 on the screw 3 consist on the one hand of a nut 6 adapted to be screwed onto the external thread 39 of the lateral branches 3g and 3c of the body 3b and on the other hand of a threaded conical plug 7 which cooperates with the internal thread 3h of said branches. The plug 7 has an imprint 7a with a hexagon socket for its rotational drive by means of a hexagon socket key.

En fig. 2 et 3, on a représenté le dispositif 1 en position montée et on remarque que L'écrou 6 permet d'immobiliser la rondelle 5 sur la tige de liai son 4, tandis que le bouchon 7 de par sa forme conique vient immobiliser d'une part l'écrou 6 en rotation et d'autre part la tige 4 en translation et en rotation autour de son axe. Lorsque les moyens de retenue sont complètement serrés, on remarque que le bouchon conique 7 vient affleurer le bord supérieur de l'écrou 6 afin d'éviter tout risque d'accrochage avec des éléments extérieurs. In fig. 2 and 3, the device 1 has been shown in the mounted position and it is noted that the nut 6 makes it possible to immobilize the washer 5 on the rod of its link 4, while the plug 7, by virtue of its conical shape, immobilizes on the one hand the nut 6 in rotation and on the other hand the rod 4 in translation and in rotation about its axis. When the retaining means are fully tightened, it is noted that the conical plug 7 comes flush with the upper edge of the nut 6 in order to avoid any risk of catching on with external elements.

En outre, il peut être prévu un capuchon 8 qui vient recouvrir l'ensemble composé de l'écrou 6 et de la rondelle 5 pour protéger les filets 39 et 3h des branches latérales 3c et 3g des éléments extérieurs tels que la chair. Les encoches filetées 5b et 5c permettent à l'opérateur de réaliser un réglage parfait de la tige filetée 4, entre deux points d'ancrage. In addition, a cap 8 can be provided which covers the assembly composed of the nut 6 and the washer 5 to protect the threads 39 and 3h from the lateral branches 3c and 3g from external elements such as the flesh. The threaded notches 5b and 5c allow the operator to make a perfect adjustment of the threaded rod 4, between two anchoring points.

De plus, la vis 3 est percée en son milieu à la manière connue d'un trou débouchant 3i qui permet de guider ladite vis lors de sa mise en place dans les apophyses 2b de chacune des vertèbres 2c correspondantes. In addition, the screw 3 is pierced in the middle in the known manner with a through hole 3i which allows said screw to be guided during its positioning in the processes 2b of each of the corresponding vertebrae 2c.

Il doit d'ailleurs être entendu que la description qui précède n'a été donnée qu'à titre d'exemple et qu'elle ne limite nullement le domaine de l'invention dont on ne sortirait pas en remplaçant les détails d'exécution décrits par tous autres équivalents.  It should moreover be understood that the foregoing description has been given only by way of example and that it in no way limits the field of the invention from which one would not depart by replacing the execution details described by all other equivalents.

Claims (3)

R E V E N D I C A T I O N S REVENDICATIONSR E V E N D I C A T I O N S CLAIMS 1. Dispositif pour le redressement et l'étaiement d'un rachis comprenant des vis d'ancrage pourvues d'un corps formé de deux branches latérales délimitant un canal ouvert de part et d'autre dudit corps pour le passage d'une tige de liaison qui est immobilisée par un écrou, caractérisé en ce que les branches latérales (3c, 3d) du corps (3b) sont filetées intérieurement (3t) et extérieurement (39) pour immobiliser une tige de liaison filetée (4) par l'intermédiaire d'une rondelle filetée (5) entourant lesdites branches et coopérant avec les filets de la tige (4), d'un écrou (6) adapté pour être vissé sur l'extérieur des branches (3c) et (3d) afin de serrer ladite rondelle sur la tige (4) et d'un bouchon conique (7) qui est vissé entre lesdites branches pour les écarter et immobiliser d'une part L'écrou (6) en rotation et d'autre part la tige (4) en translation et en rotation autour de son axe. 1. Device for straightening and shoring a spine comprising anchor screws provided with a body formed by two lateral branches delimiting an open channel on either side of said body for the passage of a rod of connection which is immobilized by a nut, characterized in that the lateral branches (3c, 3d) of the body (3b) are internally threaded (3t) and externally (39) to immobilize a threaded connection rod (4) via a threaded washer (5) surrounding said branches and cooperating with the threads of the rod (4), a nut (6) adapted to be screwed onto the outside of the branches (3c) and (3d) in order to tighten said washer on the rod (4) and a conical plug (7) which is screwed between said branches to move them apart and immobilize on the one hand the nut (6) in rotation and on the other hand the rod (4) in translation and in rotation around its axis. 2. Dispositif suivant la revendication 1, caractérisé en ce que La rondelle (5) comporte deux encoches opposées (5b, 5c) comportant respectivement des filets qui coopèrent avec celui de la tige (4) pour permettre un réglage parfait de celle-ci entre deux points d'ancrage. 2. Device according to claim 1, characterized in that the washer (5) comprises two opposite notches (5b, 5c) respectively comprising threads which cooperate with that of the rod (4) to allow perfect adjustment of the latter between two anchor points. 3. Dispositif suivant la revendication 1, caractérisé en ce que le bouchon (6) et la rondelle (5) sont recouverts d'un capuchon (8) pour éviter aux éléments extérieurs tels que de la chair de pénétrer dans les filets (39 et 3h) des branches latérales (3c et 3d) de la vis.  3. Device according to claim 1, characterized in that the plug (6) and the washer (5) are covered with a cap (8) to prevent external elements such as flesh from entering the threads (39 and 3h) lateral branches (3c and 3d) of the screw.
FR9313223A 1993-11-02 1993-11-02 Device for straightening and shoring up a spine. Expired - Fee Related FR2711909B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR9313223A FR2711909B1 (en) 1993-11-02 1993-11-02 Device for straightening and shoring up a spine.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR9313223A FR2711909B1 (en) 1993-11-02 1993-11-02 Device for straightening and shoring up a spine.

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FR2711909A1 true FR2711909A1 (en) 1995-05-12
FR2711909B1 FR2711909B1 (en) 1996-02-09

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1996031167A1 (en) * 1995-04-05 1996-10-10 Chauvin Jean Luc Device for straightening and supporting a backbone
WO1998041159A1 (en) 1997-03-18 1998-09-24 Scient'x Implant for osteosynthesis device and tool for setting such implant
WO1999000065A1 (en) 1997-06-27 1999-01-07 David Attali Adjustable fixing device for straightening and supporting the back bone
WO2006089237A1 (en) * 2005-02-18 2006-08-24 Warsaw Orthopedic, Inc. Implants and methods for positioning same in surgical approaches to the spine
EP1808141A1 (en) * 2006-01-11 2007-07-18 BIEDERMANN MOTECH GmbH Bone anchoring assembly
CN100376219C (en) * 1998-07-06 2008-03-26 株式会社率高 Spine fixing apparatus
US8465526B2 (en) 2007-04-30 2013-06-18 Globus Medical, Inc. Flexible spine stabilization system

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2624720A1 (en) * 1987-12-21 1989-06-23 Fabrication Materiel Orthopedi Implant for osteosynthesis device, in particular for the spine
EP0348272A1 (en) * 1988-06-24 1989-12-27 Societe De Fabrication De Materiel Orthopedique Implant for a spiral osteosynthesis device, especially in traumatology
WO1991001691A1 (en) * 1989-07-26 1991-02-21 J.B.S. S.A. Device for straightening, securing, compressing and elongating the spinal column
EP0465158A2 (en) * 1990-07-04 1992-01-08 Seyed Mohammad Hossein Mehdian Apparatus for use in the treatment of spinal disorders

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2624720A1 (en) * 1987-12-21 1989-06-23 Fabrication Materiel Orthopedi Implant for osteosynthesis device, in particular for the spine
EP0348272A1 (en) * 1988-06-24 1989-12-27 Societe De Fabrication De Materiel Orthopedique Implant for a spiral osteosynthesis device, especially in traumatology
WO1991001691A1 (en) * 1989-07-26 1991-02-21 J.B.S. S.A. Device for straightening, securing, compressing and elongating the spinal column
EP0465158A2 (en) * 1990-07-04 1992-01-08 Seyed Mohammad Hossein Mehdian Apparatus for use in the treatment of spinal disorders

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1996031167A1 (en) * 1995-04-05 1996-10-10 Chauvin Jean Luc Device for straightening and supporting a backbone
WO1998041159A1 (en) 1997-03-18 1998-09-24 Scient'x Implant for osteosynthesis device and tool for setting such implant
WO1999000065A1 (en) 1997-06-27 1999-01-07 David Attali Adjustable fixing device for straightening and supporting the back bone
CN100376219C (en) * 1998-07-06 2008-03-26 株式会社率高 Spine fixing apparatus
WO2006089237A1 (en) * 2005-02-18 2006-08-24 Warsaw Orthopedic, Inc. Implants and methods for positioning same in surgical approaches to the spine
JP2008529748A (en) * 2005-02-18 2008-08-07 ウォーソー・オーソペディック・インコーポレーテッド Implant and method for positioning an implant in a spine with a surgical approach
US7559929B2 (en) 2005-02-18 2009-07-14 Warsaw Orthopedic, Inc. Implants and methods for positioning same in surgical approaches to the spine
EP1808141A1 (en) * 2006-01-11 2007-07-18 BIEDERMANN MOTECH GmbH Bone anchoring assembly
EP2025295A1 (en) * 2006-01-11 2009-02-18 BIEDERMANN MOTECH GmbH Bone anchoring assembly
US8465526B2 (en) 2007-04-30 2013-06-18 Globus Medical, Inc. Flexible spine stabilization system

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Publication number Publication date
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