FR2715825A1 - Self-aligning rod for spinal osteosynthesis apparatus - Google Patents

Self-aligning rod for spinal osteosynthesis apparatus Download PDF

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Publication number
FR2715825A1
FR2715825A1 FR9401662A FR9401662A FR2715825A1 FR 2715825 A1 FR2715825 A1 FR 2715825A1 FR 9401662 A FR9401662 A FR 9401662A FR 9401662 A FR9401662 A FR 9401662A FR 2715825 A1 FR2715825 A1 FR 2715825A1
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FR
France
Prior art keywords
self
cable
connecting rod
stop
elements
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Pending
Application number
FR9401662A
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French (fr)
Inventor
Fournet-Fayard Jacques
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Soprane SA
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Soprane SA
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Filing date
Publication date
Application filed by Soprane SA filed Critical Soprane SA
Priority to FR9401662A priority Critical patent/FR2715825A1/en
Publication of FR2715825A1 publication Critical patent/FR2715825A1/en
Pending legal-status Critical Current

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Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
    • A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
    • A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
    • A61B17/70—Spinal positioners or stabilisers ; Bone stabilisers comprising fluid filler in an implant
    • A61B17/7001—Screws or hooks combined with longitudinal elements which do not contact vertebrae
    • A61B17/7002—Longitudinal elements, e.g. rods
    • A61B17/7011—Longitudinal element being non-straight, e.g. curved, angled or branched
    • A61B17/7013—Longitudinal element being non-straight, e.g. curved, angled or branched the shape of the element being adjustable before use
    • 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

Abstract

The rod (3) is made from a series of identical components (4) which are articulated relative to one another and lockable. Each component comprises a cylindrical body with a central channel (4b) through it, having a spherical portion (4c) at one end and a truncated conical recess (4d) at the other, shaped to receive the spherical tip of an adjacent component. The cylindrical components are locked together to form a rigid body by means of an inner cable (5a) with a fixed tip (5b) at one end and a threaded tip (5c) at the other designed to receive a bush (5f) with a spherical surface and a locking nut.

Description

La présente invention a trait à une tige de liaison auto-cintrable pour fixateur de rachis et plus particulièrement pour l'ostéosynthèse de la région lombo-sacrée. The present invention relates to a self-bending connecting rod for spine fixator and more particularly for osteosynthesis of the lumbosacral region.

On utilise couramment pour les ostéosynthèses de rachis lombo-sacré des fixateurs comprenant des vis pédiculaires ancrées dans chaque vertèbre à réunir et des tiges métalliques permettant la liaison entre chaque vertèbre ou chaque vis. Il se trouve que les vis pédiculaires, du fait de la lordose lombaire et de l'écartement pédiculaire variable du haut en bas du rachis lombaire, ne sont jamais parfaitement alignees. Fixers comprising lumbar-sacral spine osteosyntheses are commonly used for fixation comprising pedicle screws anchored in each vertebra to be joined and metal rods allowing the connection between each vertebra or each screw. It turns out that the pedicle screws, due to the lumbar lordosis and the variable pedicle spacing from top to bottom of the lumbar spine, are never perfectly aligned.

Cette variation entre chaque vis pédiculaire oblige le chirurgien à cintrer la tige de liaison afin d'assurer un bon contact avec les moyens de serrage prévus sur les vis pédiculaires.This variation between each pedicle screw forces the surgeon to bend the connecting rod in order to ensure good contact with the clamping means provided on the pedicle screws.

On remarque que la courbure a obtenir est irrégulière et complexe, rendant le cintrage manuel de la tige de liaison difficile et fastidieux. We note that the curvature to obtain is irregular and complex, making manual bending of the connecting rod difficult and tedious.

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 but de l'invention est de réunir les vis pédiculaires à l'aide d'une tige initialement souple du fait de sa constitution et permettant une connexion facile, tandis qu'elle n'est rendue rigide que secondairement lorsque celle-ci est mise en place sur toutes les vis pédiculaires. The object of the invention is to bring together the pedicle screws using an initially flexible rod due to its constitution and allowing easy connection, while it is only made rigid secondarily when the latter is put in place on all pedicle screws.

La tige auto-cintrable suivant la présente invention comprend une pluralité d'éléments identiques articulés entre eux et des moyens de serrage disposés suivant l'axe principal de ladite tige en vue du blocage desdits éléments entre eux de manière à rigidifier la tige. The self-bending rod according to the present invention comprises a plurality of identical elements hinged together and clamping means arranged along the main axis of said rod in order to block said elements together so as to stiffen the rod.

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 et 2 sont des vues montrant la mise en place de la tige auto-cintrable suivant l'invention dans la région lombo-sacrée à l'aide de vis pédiculaires connues en soi.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 and 2 are views showing the positioning of the self-bending rod according to the invention in the lumbosacral region using pedicle screws known per se.

Fig. 3 est une vue en perspective éclatée illustrant les différents éléments identiques et les moyens de serrage de la tige auto-cintrable. Fig. 3 is an exploded perspective view illustrating the different identical elements and the means for tightening the self-bending rod.

Fig. 4 est une coupe représentant la tige auto-cintrable en position rigidifiée. Fig. 4 is a section showing the self-bending rod in the stiffened position.

Fig. 5 est une vue de détail montrant la liaison entre chaque élément identique constituant la tige de liaison. Fig. 5 is a detail view showing the connection between each identical element constituting the connecting rod.

Fig. 6 est une coupe illustrant une variante des moyens de serrage axial pour la mise en compression de la tige auto-cintrable. Fig. 6 is a section illustrating a variant of the axial clamping means for compressing the self-bending rod.

On a représenté en fig. 1 et 2 la partie lombo-sacrée d'une colonne vertébrale 1 dont les vertèbres lombaires la et le sacrum lb sont réunis par l'intermédiaire d'un fixateur 2 en vue de soulager par exemple les disques 1c. Le fixateur 2 est constitué d'un certain nombre de vis pédiculaires 2a connues en soi ancrées de part et d'autre des apophyses épineuses ld de chaque vertèbre la et plus particuliérement dans les pédicules le. Les vis pédiculaires 2a sont reliées les unes aux autres par une tige auto-cintrable 3 qui est retenue sur ces dernières par des moyens de serrage connus en soi. There is shown in fig. 1 and 2 the lumbosacral part of a vertebral column 1, the lumbar vertebrae 1a and the sacrum 1b are joined together by means of a fixator 2 with a view to relieving, for example, the discs 1c. The fixator 2 consists of a number of pedicle screws 2a known per se anchored on either side of the spinous processes ld of each vertebra la and more particularly in the pedicles le. The pedicle screws 2a are connected to each other by a self-bending rod 3 which is retained on the latter by clamping means known per se.

En fig. 3 à 5, on a montré la tige auto-cintrable 3 qui est constituée d'une pluralité d'éléments identiques 4 articulés les uns par rapport aux autres et retenus par des moyens de serrage axial 5. In fig. 3 to 5, the self-bending rod 3 is shown which is made up of a plurality of identical elements 4 articulated with respect to each other and retained by axial clamping means 5.

Chaque élément 4 comporte un corps cylindrique 4a percé en son milieu d'un alésage débouchant 4b. L'extrémité 4c du corps cylindrique 4a présente un profil en portion de sphère, tandis que l'autre extrémité 4d est en forme de tronc de cône dont la base la moins large est dirigée à l'intérieur du corps 4a. L'inclinaison du tronc de cône de l'extrémité 4g de chaque élément 4 présente un angle suffisant pour recevoir l'ex trémité 4c en portion de sphère des éléments suivants 4 afin que chaque élément puisse pivoter l'un par rapport à l'autre. Each element 4 comprises a cylindrical body 4a pierced in the middle with a through bore 4b. The end 4c of the cylindrical body 4a has a profile in the form of a portion of a sphere, while the other end 4d is in the form of a truncated cone, the narrower base of which is directed inside the body 4a. The inclination of the truncated cone of the end 4g of each element 4 has a sufficient angle to receive the end 4c in portion of a sphere of the following elements 4 so that each element can pivot relative to each other .

Les moyens de serrage 5 sont constitués plus particulièrement d'un câble Sa dont l'une des extrémités est solidaire d'une butee cylindrique 5b tandis que l'autre comporte une partie filetée 5c afin de recevoir un écrou de serrage 5g. La butée cylindrique 5b est prévue d'un diamètre extérieur équivalent à celui du corps 4a des éléments 4. La butée cylindrique 5b comporte du côté de l'ancrage du câble 5a un profil en tronc de cône 5e dont la base la moins large est dirigée à l'intérieur et en direction du milieu de ladite butée. L'inclinaison du tronc de cône 5e est équivalente à celle prévue aux extrémités 4g de chaque élément 4 afin de recevoir la portion de sphère 4c du premier élément 4 de la tige 3. The clamping means 5 consist more particularly of a cable Sa, one of the ends of which is integral with a cylindrical stop 5b while the other has a threaded part 5c in order to receive a clamping nut 5g. The cylindrical stop 5b is provided with an outside diameter equivalent to that of the body 4a of the elements 4. The cylindrical stop 5b comprises on the side of the cable anchoring 5a a truncated cone profile 5e whose narrower base is directed inside and towards the middle of said stop. The inclination of the truncated cone 5e is equivalent to that provided at the ends 4g of each element 4 in order to receive the portion of sphere 4c of the first element 4 of the rod 3.

La tige de liaison auto-cintrable 3 est composée de plusieurs éléments 4 qui sont enfilés sur le câble 5a du moyen de serrage 5, de manière que ledit câble traverse chacun des alésages 4b desdits éléments 4. The self-bending connecting rod 3 is composed of several elements 4 which are threaded on the cable 5a of the clamping means 5, so that said cable passes through each of the bores 4b of said elements 4.

Du côté de la partie filetée 5c du câble Sa et entre l'écrou Sd et le dernier élément 4 de la tige auto-cintrable 3 est prévue une butée d'appui 5f percée en son milieu d'un trou 59 pour le passage dudit câble. La butée 59 comporte une extrémité 5 en portion de sphère de diamètre équivalent à celui prévu du côté des extrémités 4c de chaque élément 4 de maniére à coopérer avec l'extrémité 4g en portion de cône du dernier élément 4 de la tige 3. On the side of the threaded part 5c of the cable Sa and between the nut Sd and the last element 4 of the self-bending rod 3 is provided a support stop 5f pierced in the middle of a hole 59 for the passage of said cable . The abutment 59 has one end 5 in the portion of a sphere of diameter equivalent to that provided on the side of the ends 4c of each element 4 so as to cooperate with the end 4g in the cone portion of the last element 4 of the rod 3.

L'autre extrémité 51 de la butée 5f est prévue plane pour constituer une surface d'appui perpendiculaire à l'axe du câble 5a pour l'écrou de serrage Sd.  The other end 51 of the stop 5f is provided flat to form a bearing surface perpendicular to the axis of the cable 5a for the tightening nut Sd.

En fig. 5, on a montré la liaison entre chaque élément 4 et plus particulièrement l'état de surface des extrémités 4c et 4g qui sont prévues rugueuses afin d'améliorer le contact pour éviter toute mobilité entre lesdits éléments après la mise en tension du câble 5a des moyens de serrage 5. In fig. 5, we have shown the connection between each element 4 and more particularly the surface condition of the ends 4c and 4g which are provided rough in order to improve the contact to avoid any mobility between said elements after the tensioning of the cable 5a of the clamping means 5.

En fig. 6, on a montré une variante de mise en tension du câble 5a permettant l'immobilisation des éléments 4 dans leur position définitive. La variante consiste à utiliser une butée d'appui 6 identique à celle 5f représentée en fig. 3 et 4, mais comportant un corps 6a déformable latéralement au moyen par exemple d'une pince en vue de sertir à l'intérieur de son alésage 6b le câble 5a après sa mise en tension. In fig. 6, a variant of tensioning the cable 5a has been shown allowing the elements 4 to be immobilized in their final position. The variant consists in using a support stop 6 identical to that 5f shown in FIG. 3 and 4, but comprising a body 6a which can be deformed laterally by means, for example, of pliers, in order to crimp the cable 5a inside its bore 6b after it has been tensioned.

On remarque que la mise en tension du câble 5a soit par l'interme- diaire de l'écrou 5, soit au moyen d'une pince pour son sertissage dans la butée d'appui 6 permet la rigidification de la tige 3 et plus particulièrement l'immobilisation des éléments 4 entre eux une fois leur position déterminée. It is noted that the tensioning of the cable 5a either by means of the nut 5, or by means of pliers for its crimping in the support stop 6 allows the rod 3 to be stiffened and more particularly immobilization of the elements 4 together once their position has been determined.

En effet, le chirurgien procède à la mise en tension de la tige 3 une fois que celle-ci est disposée sur les vis pédiculaires 2a du fixateur 2. La souplesse de la tige 3, du fait des multiples rotations angulaires entre chaque élément 4 permet de récupérer toutes les variations entre les vis pédiculaires 2a ancrées dans les pédicules le de chaque vertèbre la. Indeed, the surgeon proceeds to tension the rod 3 once it is disposed on the pedicle screws 2a of the fixator 2. The flexibility of the rod 3, due to the multiple angular rotations between each element 4 allows to recover all the variations between the pedicle screws 2a anchored in the pedicles le of each vertebra la.

On note que le câble 5a peut être remplacé par une tige filetée souple permettant d'obtenir les mêmes rotations angulaires entre chaque élément 4 pour que la tige 3 auto-cintrable puisse récupérer les variations entre chacune des vis pédiculaires 2a. La tige filetée permet de comprimer sous l'effet d'un écrou de serrage chacun des éléments 4 en vue de les immobiliser dans leur position définitive. Note that the cable 5a can be replaced by a flexible threaded rod making it possible to obtain the same angular rotations between each element 4 so that the self-bending rod 3 can recover the variations between each of the pedicle screws 2a. The threaded rod makes it possible to compress under the effect of a tightening nut each of the elements 4 in order to immobilize them in their final position.

Il doit d'ailleurs être entendu que la description qui précéde 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 preceding 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 (8)

REVENDICATIONS 1. Tige de liaison auto-cintrable pour fixateur permettant l'ostéosynthèse du rachis lombo-sacré, ladite tige étant fixée sur des vis pédiculaires connues en soi préalablement ancrées sur chaque vertèbre de la colonne, caractérisée en ce qu'elle comprend une pluralité d'éléments identiques (4) articulés entre eux et des moyens de serrage (S) disposés suivant l'axe principal de la tige (3) de manière à immobiliser lesdits éléments dans leur position définitive. 1. Self-bendable connecting rod for fixator allowing osteosynthesis of the lumbosacral spine, said rod being fixed on pedicle screws known per se previously anchored on each vertebra of the column, characterized in that it comprises a plurality of 'identical elements (4) hinged together and clamping means (S) arranged along the main axis of the rod (3) so as to immobilize said elements in their final position. 2. Tige de liaison auto-cintrable suivant la revendication 1, caractérisée en ce que chaque élément (4) est constitué d'un corps cylindrique (4a) percé en son milieu d'un alésage débouchant (4b) et dont l'une des extrémités (4c) est prévue en portion de sphère, tandis que la seconde extrémité (4d) présente un profil en tronc de cône dont la base la moins large est dirigée à l'intérieur dudit corps (4a).  2. Self-bendable connecting rod according to claim 1, characterized in that each element (4) consists of a cylindrical body (4a) pierced in its middle with a through bore (4b) and one of which ends (4c) is provided in the form of a portion of a sphere, while the second end (4d) has a truncated cone profile, the narrower base of which is directed inside said body (4a). 3. Tige de liaison auto-cintrable suivant la revendication 1, caractérisée en ce que l'inclinaison du tronc de cône prévu à l'extrémité (4g) de l'élément (4) est déterminée pour recevoir l'extrémité (4c) en portion de sphère d'un autre élément (4) en vue de constituer une articulation. 3. Self-bendable connecting rod according to claim 1, characterized in that the inclination of the truncated cone provided at the end (4g) of the element (4) is determined to receive the end (4c) in portion of sphere of another element (4) in order to constitute a joint. 4. Tige de liaison auto-cintrable suivant la revendication 1, caractérisée en ce que les moyens de serrage consistent en un câble (5a) traversant les éléments (4) en leur milieu par l'intermédiaire des alésages (4b), le câble (5a) étant solidaire à l'une de ses extrémités d'une butée cylindrique (5b), tandis que l'autre extrémité comporte une partie filetée (5c) qui coopère avec un écrou (su), et une butée d'appui (5f) qui est placée entre l'écrou (5d) et le dernier élément (4) de la tige (3) pour la mise en tension du câble (Sa).  4. Self-bendable connecting rod according to claim 1, characterized in that the clamping means consist of a cable (5a) passing through the elements (4) in their middle by means of the bores (4b), the cable ( 5a) being integral with one of its ends with a cylindrical stop (5b), while the other end comprises a threaded part (5c) which cooperates with a nut (su), and a support stop (5f ) which is placed between the nut (5d) and the last element (4) of the rod (3) for tensioning the cable (Sa). 5. Tige de liaison auto-cintrable suivant la revendication 4, caractérisée en ce que la butée (5~) comporte du côté de l'ancrage dudit câble (5a) un profil en tronc de cône (5e) d'inclinaison équivalente à celle (4a) des extrémités des éléments (4) pour coopérer avec la sphère (4c) du premier élément (4) de la tige (3). 5. Self-bending connecting rod according to claim 4, characterized in that the stop (5 ~) comprises on the side of the anchoring of said cable (5a) a truncated cone profile (5e) of inclination equivalent to that (4a) of the ends of the elements (4) to cooperate with the sphere (4c) of the first element (4) of the rod (3). 6. Tige de liaison auto-cintrable suivant la revendication 4, caractérisée en ce que la butée d'appui (5f) comprend un trou (59) ménagé en son milieu pour le passage du câble (5a), une première extrémité (5t) en portion de sphère pour coopérer avec le profil en tronc de cône (4d) du dernier élément (4) de la tige (3) et une seconde extrémité plane pour pour constituer une surface d'appui à l'écrou de serrage (5d).  6. Self-bending connecting rod according to claim 4, characterized in that the bearing stop (5f) comprises a hole (59) formed in its middle for the passage of the cable (5a), a first end (5t) in a portion of a sphere to cooperate with the truncated cone profile (4d) of the last element (4) of the rod (3) and a second planar end to form a support surface for the tightening nut (5d) . 7. Tige de liaison auto-cintrable suivant la revendication 1, caractérisée en ce que les extrémités (4 et 4d) des éléments (4), le tronc de cône (5e) de la butée (5b) et l'extrémité (5h) de la butée d'appui (5f) sont usinés de manière à obtenir un état de surface rugueux pour faciliter le contact entre eux afin d'obtenir une parfaite immobilisation de la tige (3) lors de la mise en tension du câble (5a).  7. Self-bendable connecting rod according to claim 1, characterized in that the ends (4 and 4d) of the elements (4), the truncated cone (5e) of the stop (5b) and the end (5h) of the support stop (5f) are machined so as to obtain a rough surface state to facilitate contact between them in order to obtain perfect immobilization of the rod (3) during the tensioning of the cable (5a) . 8. Tige de liaison auto-cintrable suivant la revendication 4, caractérisée en ce qu'elle comprend une butée d'appui (6) comportant un corps (6a) pour le sertissage au moyen d'une pince de l'extrémité libre du câble (5a) en vue de son immobilisation après sa mise en tension.  8. Self-bendable connecting rod according to claim 4, characterized in that it comprises a support stop (6) comprising a body (6a) for crimping by means of pliers of the free end of the cable (5a) for its immobilization after it has been tensioned.
FR9401662A 1994-02-09 1994-02-09 Self-aligning rod for spinal osteosynthesis apparatus Pending FR2715825A1 (en)

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US8870928B2 (en) 2002-09-06 2014-10-28 Roger P. Jackson Helical guide and advancement flange with radially loaded lip
US8911478B2 (en) 2012-11-21 2014-12-16 Roger P. Jackson Splay control closure for open bone anchor
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US10064658B2 (en) 2014-06-04 2018-09-04 Roger P. Jackson Polyaxial bone anchor with insert guides
DE102017002000A1 (en) 2017-03-01 2018-09-06 SAMA GmbH DEVICE COMPRISING A MULTIPLE OF JOINTED BODIES
US10349983B2 (en) 2003-05-22 2019-07-16 Alphatec Spine, Inc. Pivotal bone anchor assembly with biased bushing for pre-lock friction fit
WO2021059110A1 (en) * 2019-09-23 2021-04-01 Premia Spine Ltd. Flexible spinal fusion rod
US11229457B2 (en) 2009-06-15 2022-01-25 Roger P. Jackson Pivotal bone anchor assembly with insert tool deployment
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US6296644B1 (en) 1998-08-26 2001-10-02 Jean Saurat Spinal instrumentation system with articulated modules
WO2003068085A1 (en) * 2002-02-11 2003-08-21 Gerd Werding Device for externally immobilizing broken bones
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US8870928B2 (en) 2002-09-06 2014-10-28 Roger P. Jackson Helical guide and advancement flange with radially loaded lip
US8211153B2 (en) * 2003-04-25 2012-07-03 Warsaw Orthopedic, Inc. Articulating spinal fixation rod and system
US10349983B2 (en) 2003-05-22 2019-07-16 Alphatec Spine, Inc. Pivotal bone anchor assembly with biased bushing for pre-lock friction fit
US8936623B2 (en) 2003-06-18 2015-01-20 Roger P. Jackson Polyaxial bone screw assembly
US8926670B2 (en) 2003-06-18 2015-01-06 Roger P. Jackson Polyaxial bone screw assembly
US9144444B2 (en) 2003-06-18 2015-09-29 Roger P Jackson Polyaxial bone anchor with helical capture connection, insert and dual locking assembly
US8623057B2 (en) 2003-09-24 2014-01-07 DePuy Synthes Products, LLC Spinal stabilization device
US7993370B2 (en) 2003-09-24 2011-08-09 N Spine, Inc. Method and apparatus for flexible fixation of a spine
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US9743957B2 (en) 2004-11-10 2017-08-29 Roger P. Jackson Polyaxial bone screw with shank articulation pressure insert and method
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US8221467B2 (en) 2005-11-18 2012-07-17 Life Spine, Inc. Dynamic spinal stabilization device and systems
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US8109975B2 (en) * 2007-01-30 2012-02-07 Warsaw Orthopedic, Inc. Collar bore configuration for dynamic spinal stabilization assembly
US8172879B2 (en) 2007-08-23 2012-05-08 Life Spine, Inc. Resilient spinal rod system with controllable angulation
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US9918745B2 (en) 2009-06-15 2018-03-20 Roger P. Jackson Polyaxial bone anchor with pop-on shank and winged insert with friction fit compressive collet
US9668771B2 (en) 2009-06-15 2017-06-06 Roger P Jackson Soft stabilization assemblies with off-set connector
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US8998959B2 (en) 2009-06-15 2015-04-07 Roger P Jackson Polyaxial bone anchors with pop-on shank, fully constrained friction fit retainer and lock and release insert
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