FR2745706A1 - Prosthetic vertebral support device - Google Patents

Prosthetic vertebral support device Download PDF

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Publication number
FR2745706A1
FR2745706A1 FR9602731A FR9602731A FR2745706A1 FR 2745706 A1 FR2745706 A1 FR 2745706A1 FR 9602731 A FR9602731 A FR 9602731A FR 9602731 A FR9602731 A FR 9602731A FR 2745706 A1 FR2745706 A1 FR 2745706A1
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Prior art keywords
rods
characterized
prosthetic
device according
device
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French (fr)
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OPTION SA
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OPTION SA
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    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/56Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
    • A61B17/58Surgical 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
    • A61B17/68Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
    • A61B17/70Spinal positioners or stabilisers ; Bone stabilisers comprising fluid filler in an implant
    • A61B17/7001Screws or hooks combined with longitudinal elements which do not contact vertebrae
    • A61B17/7002Longitudinal elements, e.g. rods
    • A61B17/7019Longitudinal elements having flexible parts, or parts connected together, such that after implantation the elements can move relative to each other
    • A61B17/7026Longitudinal 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
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/56Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
    • A61B17/58Surgical 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
    • A61B17/68Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
    • A61B17/70Spinal positioners or stabilisers ; Bone stabilisers comprising fluid filler in an implant
    • A61B17/7001Screws or hooks combined with longitudinal elements which do not contact vertebrae
    • A61B17/7002Longitudinal elements, e.g. rods
    • A61B17/7019Longitudinal elements having flexible parts, or parts connected together, such that after implantation the elements can move relative to each other
    • A61B17/7026Longitudinal elements having flexible parts, or parts connected together, such that after implantation the elements can move relative to each other with a part that is flexible due to its form
    • A61B17/7029Longitudinal elements having flexible parts, or parts connected together, such that after implantation the elements can move relative to each other with a part that is flexible due to its form the entire longitudinal element being flexible
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/56Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
    • A61B17/58Surgical 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
    • A61B17/68Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
    • A61B17/70Spinal positioners or stabilisers ; Bone stabilisers comprising fluid filler in an implant
    • A61B17/7001Screws or hooks combined with longitudinal elements which do not contact vertebrae
    • A61B17/7002Longitudinal elements, e.g. rods
    • A61B17/7019Longitudinal elements having flexible parts, or parts connected together, such that after implantation the elements can move relative to each other
    • A61B17/7026Longitudinal elements having flexible parts, or parts connected together, such that after implantation the elements can move relative to each other with a part that is flexible due to its form
    • A61B17/7028Longitudinal elements having flexible parts, or parts connected together, such that after implantation the elements can move relative to each other with a part that is flexible due to its form the flexible part being a coil spring

Abstract

The support has a flexible central rod (6) entirely surrounded coaxially and helically with multiple flexible rods (71,72...). The rods are connected and solidly fixed at each end by a cap (81b,82b...) and allows the support to be fixed to the pedicular screws in the standard manner. The rods can be fixed into the caps by laser or electron beam welding. The support can be formed of biocompatible materials and can have a surface which is mirror polished or matt.

Description

La présente invention se rapporte aux prothèses intervertébrales et concerne plus particulière:nent celle assujetties aux vertèbres par des vis pédiculaires. The present invention relates to intervertebral prostheses and concerns more specific: NEET subject to the vertebrae by pedicle screws.

Les prothèses de ce genre sont constituées en quasi-totalité de tiges rigides telles que celles représentées par exemple, dans de nombreux brevets. The prostheses of this kind are composed almost entirely of rigid rods such as shown for example in numerous patents. (î) (I)
L'expérience montre que des ruptures se produisent prématurèment du fait du nombre élevé de contraintes alternatives appliquées d'origines diverses (pilonement du à la marche, etc..) dépassant 10 000 000 cycles, ce qui nécessite trés souvent, le remplacement de la prothèse. Experience shows that ruptures occur prematurely due to the high number of alternatives applied stresses of various origins (pilonement of walking, etc ..) exceeding 10 million cycles, requiring very often replacement prosthesis.

Selon l'application des règles de fatigue des matériaux, la limite élastique d'un matériau donné diminue progressivement lorsque ledit matériau est soumis à un nombre de sollicitations alternées produisant la rupture aprés que soient apparus, dans le métal, une période de germination d'amorçages puis de fissures. Depending on the application of rules fatigue of materials, the elastic limit of a given material gradually decreases when said material is subjected to a number of alternating stresses occurring break after that have appeared in the metal, a germination period of Fuses and cracks. La contrainte axiale appliquée à une tige rigide variera selon le même cycle en oscillant entre deux valeurs #max positive, sollicitation en traction et #min négative, sollicitation en compression; The axial stress applied to a rigid rod will vary with the same cycle oscillating between two values ​​#max positive, tensile stress and negative #min, compressive stress; cette contrainte étant la contrainte alternée symétrique de fatigue axiale,la contrainte moyenne: # m = #max + #min étant nulle dans ce cas. this constraint being the symmetrical alternating stress of axial strain, the average stress: = #max # m + #min being zero in this case.

2 .# min est égal à - 6 max dans ce cas, selon la représentation conforme à la figure 1 ci-aprés. . # 2 min is equal to - 6 max in this case, according to the representation according to Figure 1 hereinafter.

Les contraintes réelles exercées sur une prothèse à tige, en traction/compression/flexion/torsion sont de fait, encores plus contraignantes. The actual stress on a prosthesis stem in tension / compression / bending / torsion are indeed encores more stringent.

(1) (1)
FR - 2693365/2692471/2687561/2684866/2682280/2680461/2676354/2659546/ FR - 2693365/2692471/2687561/2684866/2682280/2680461/2676354/2659546 /
2659225/2658414/26584l3/2657775/256l992/26 50173/2645732/2645427/ 2659225/2658414 / 26584l3 / 2657775 / 256l992 / 26 50173/2645732/2645427 /
2642642/26404g3/2638e32/2636227/26a3177/2631 54o/22472O/2623390/ 2642642 / 26404g3 / 2638e32 / 2636227 / 26a3177 / 2631 54o / 22472O / 2623390 /
2621476/2515095. 2621476/2515095.

PCT- 93-13722/93-12737/93-10726/93-10717/93-07823/89-08431/89-00028 PCT-93-13722 / 93-12737 / 93-10726 / 93-10717 / 93-07823 / 89-08431 / 89-00028
88-06024. 88-06024.

EP - 578320/565149/564046/558883/487895/487830/348581/330881/284559. EP - 578320/565149/564046/558883/487895/487830/348581/330881/284559.

Les prothèses intervertébrales rigides à tiges, bien que risquant d'être rompues prématurément, présentaient néamoins un avantage incontestable lié au fait qu'elles assuraient la conservation de la géométrie du trou de conjugaison intervertébral empêchant par la même, la compression des racines nerveuses. Rigid intervertebral prostheses with stems, although likely to be broken prematurely, néamoins showed an unquestionable advantage linked to the fact that they ensured the retention of the geometry of the intervertebral foramen by preventing the same, the compression of the nerve roots.

Afin d'éviter les risques de ruptures prématurées et d'amèliorer le confort du patient, on eut l'idée de substituer aux tiges rigides un dispositif d'amortissement pouvant être élastique. To avoid the risk of premature failures and improve Latest patient comfort, we had the idea to replace the rigid rods a damping device can be elastic.

On trouve à cet effet, de nombreux brevets et publications (2) ainsi qu'une propre demande antérieure du demandeur (EP NO 95 40 0558), dans laquelle on prévoyait des systèmes élastiques avec amortissement, soit directionnels en vue de corriger certains défauts spécifiques tels que scolioses par exémple, soit encore omnidirectionnels. Found for this purpose, many patents and publications (2) and a own earlier application of the applicant (EP No. 95 40 0558), in which provided with elastic damping systems or directional to correct specific defects such as scoliosis for example, is still omnidirectional.

De tels systèmes souples amélioraient incontestablement le confort du patient, supprimaient pratiquement les risques de rupture mais introduisaient par contre, un défaut inhérent à leur souplesse même qui était de restreindre la géométrie du trou de conjugaison comprimant alors les racines nerveuses. Such flexible systems undoubtedly improved patient comfort, virtually suppressed the risks of rupture but were introducing by cons, a fault inherent in their very flexibility that was to restrict the geometry of the foramen then compressing the nerve roots.

Il restait à concevoir un système qui présentait les avantages des prothèses rigides, quant au respect de la géométrie du trou de conjugaison et des prothèses souples, et leur tenue mécanique ainsi qu'au confort apporté au patient. It remained to design a system that presented the advantages of rigid prostheses, for compliance with the geometry of the foramen and flexible prostheses, and mechanical strength as well as comfort to the patient.

(2) - Three-dimensional properties of the human cervical... (European spine journal 1993) - A biomechanical analysis of short segment spinal...(Spine Vol 18 N. 5 (2) - Three-dimensional properties of the human cervical ... (European Spine Journal 1993) - A biomechanical analysis of spinal segment shorts ... (Spine Vol 18 No. 5
PP 536/545 - 1993) - Tfree dimensional geometrical and mechanical...(Biomechanical Vol. 25 NO 10 PP 1164/1992) - Influence of geometrical factors...( European spine journal - 1994j PP 536/545 - 1993) - TFREE dimensional geometrical and mechanical ... (Biomechanical Vol 25 NO 10 PP 1164/1992.) - Influence of geometrical factors ... (European Spine Journal - 1994j
- Comportement bio-mécar.ique d'uc ressort ir.ter-apophysa:-e vertébral (rachis 1993 - Vol.5 NO 2) -Clinical Bionechanical Vol. - Behavior bio-mécar.ique uc spring ir.ter-apophysa: -e vertebral (spine 1993 - Vol.5 NO 2) -Clinical Bionechanical Vol. 7 NO 4 Nov '992. 7 NO 4 November '992.

- Brevets: F 2681525/2683445/2674264/EP 516567/576379/538133/188954 - Patents: F 2681525/2683445/2674264 / EP 516567/576379/538133/188954
L' invention sera bien comprise dans la suite du texte qui va montrer à l'appui des dessins annexés, une forme de réalisation de cette invention. The invention will be well understood in the rest of the text that will show in support of the accompanying drawings, one embodiment of this invention.

La figure 1 représente conventionnellement, le graphique des contraintes apparaissant sur une pièce rigide soumise à des efforts de tractions/compression alternés. 1 shows conventionally, the graph constraints appearing on a rigid part subjected to tractions / alternating compressive forces.

Les figures 2 et 3 représentent en coupe et vue latérale conventionnelles, la conformation de deux vertèbres telles que lombaires par exemple, Figures 2 and 3 show sectional side view and conventional, the conformation of two vertebrae such as lumbar e.g.,
La figure 4 représente schèmatiquement une tige rigide subissant un travail de traction/compression, la figure 5 un ressort hélicoidal subissant un travail équivalent ou l'on sait qu'il est soumis à une contrainte de cisaillement et la figure 6, le dispositif selon l'invention qui travaille cette fois en flexion. 4 shows schematically a rigid rod undergoing working tension / compression, Figure 5 undergoing a helical spring or equivalent work is known that it is subjected to shear stress and Figure 6, the device according to invention that works this time bending.

La figure 7a représente en vue latérale, l'un des deux dispositif selon l'invention disposé entre deux vertèbres et la figure 7b, est une coupe transversale selon aa' dudit dispositif. Figure 7a shows a side view of one of the device of the invention disposed between two vertebrae and Figure 7b is a cross section along AA 'of the device.

La figure 8 est une section transversale selon bb' de la vertèbre supérieure de la figure 7a. Figure 8 is a cross-section according to BB 'of the upper vertebra of FIG 7a.

Les figures 2 et 3 montrent respectivement, une vue en coupe au niveau d?,ne interface normaentre un nucléus pulposus et deux vertèbres sus et sous jascentes et la vue en projection latérale selon Figures 2 and 3 show respectively, a sectional view at the level of?, Does normaentre interface a nucleus pulposus and two vertebrae above and under jascentes and side elevational view according
F de cet ensemble vertébral. F vertebral this together.

Selon la figure 2 on peut tout d'abord distinguer de manière connue: le corps vertébral repéré CV, le nucleus pulposus NP, l'apophyse épineuse AE, le ligament jaune LJ, la dure mère DM, l'espace épidural According to Figure 2 we can first distinguish known way: the vertebral body spotted CV nucleus pulposus NP, the spinous process AE, yellow ligament LJ, the dura DM, the epidural space
EE, puis la moelle épinière ME, donnant naissance aux ganglions rachidiens GR puis aux racines gauche RAg et droites RAd par les racines antérieures RAa et postérieures RAp. EE and ME spinal cord, giving rise to GR spinal ganglia and the left and right roots RAg RAd by the anterior roots and posterior RAa RAp. Les trous de corwugaison TGg (gauche) et TSd (droite) assurent normalement le passage des racines. The holes corwugaison TGG (left) and S & d (right) typically ensure the passage of the roots.

Selon la figure 3 on peut reconnaltre tous les éléments repérés ci dessus avec en plus, les apohhyses articulaires antérieures AA, l'apophyse transverse AT, le corps vertébral supérieur CVs, le corps vertébral inférieur CVi; According to Figure 3 can reconnaltre all elements identified above with the addition, previous articular apohhyses AA, AT the transverse process, the upper vertebral body profiles, the lower vertebral body CVi; le nucléus pulposus NP étant représenté en position présumée normale. the nucleus pulposus NP being shown in assumed normal position.

Une détérioration notée DET de ce nucléus pulposus NP et représentée en pointillé sur la figure 3, peut comprimer les racines hA et en tout état de cause nécessiter la pose d'une prothèse. A marked deterioration DET of the nucleus pulposus NP and shown in dashed lines in Figure 3, can compress hA roots in any case require the fitting of a prosthesis.

C'est dans de tels cas que l'on recours soit aux prothèses rigides conventionnelles soit aux prothèses souples plus récentes, comme cela a déja été précédemment mentionné. It is in such cases that can be used with conventional rigid prostheses is the latest flexible dentures, as has already been mentioned above.

Sur les figures 7a et 7b on voit le positionnement classique des vis pédiculaires notées 1-2 sur la vertèbre supérieure et 3 4 sur la vertèbre inférieure déterminant le positionnement 1-3 en partie droite et 2-4 en partie gauche. In Figures 7a and 7b seen vector positioning of pedicle screws rated 1-2 on the upper vertebra and 3 4 of the lower vertebra determining the position 1-3 in the right part and left part 2-4.

Ces vis pédiculaires incluent leurs colliers et leurs écrous de serrage de manière connue. These include pedicle screws their collars and clamping nuts known manner.

Chaque dispositif selon l'invention repéré 5 dans son ensemble et représenté sur les figures 7 et 8, comporte une tige flexible centrale 6 entourée coaxialement et hélicoidalement, d'une pluralité de tiges flexibles 71,72 de section inférieure; Each device according to the invention 5 shown as a whole and shown in Figures 7 and 8, comprises a central flexible rod 6 surrounded coaxially and helically with a plurality of flexible rods lower section 71.72; toutes lesdites tiges flexibles étant asssujetties sur des capuchons supérieurs 81,et inférieur 82. all of said flexible rods being asssujetties on top cap 81 and bottom 82.

Dans une forme de réalisation préférée donnée purement à titre d'exemple; In a preferred embodiment given purely by way of example; la tige centrale 6 présente un diamètre de 2,2 mm et chaque tige périphérique 7...au nombre de 8, a un diamètre de 1,8 mm conduisant à un diamètre extérieur de capuchon 8 de 7 mm de diamètre pour une épaisseur de paroi de 0,6 mm; the central rod 6 has a diameter of 2.2 mm and each peripheral rod 7 ... 8 in number, has a diameter of 1.8 mm leading to a cap outer diameter of 8 to 7 mm in diameter to a thickness of wall of 0.6 mm; lesdits capuchons étant terminés par une calotte sphérique. said caps being terminated by a spherical cap.

le pas des hélices des tiges 7, est de l'ordre de 2 mm et la fixation de toutes les tiges sur leurs capuchons est assurpar soudage par faisceau d'électrons ou laser. the pitch of the propellers of the rods 7, is of the order of 2 mm and the setting of all the rods on their caps is assurpar welding by electron or laser beam.

La hauteur de chaque dispositif ainsi constitué, qui est de l'ordre de 46 mm ou plus pour 2 étages, 3 étages etc..., est compatible avec les écartements habituels entre vis pédiculaires de vertébres lombaires et peut bien entendu être adapté pour toutes autres fixations intervertébrales. The height of each device thus formed, which is of the order of 46 mm or more to 2 stages, 3 stages etc ..., is compatible with the usual spacings between pedicle screws lumbar vertebrae and may of course be suitable for all intervertebral other fasteners.

On constate que le dispositif intervertébral flexible selon l'invention peut se substituer à tous les systèmes rigides ou élastiques existants relevant d'un mode de fixation par vis pédiculaires à colliers serrés par vis comme représenté sur les différentes figures. It is noted that the flexible intervertebral device according to the invention can replace any existing rigid or elastic systems belonging to a method of fixing by pedicle screws to screw tight collars as shown in the various figures.

Il ne présente aucun des inconvènients précités soit de rupture pour les prothèses rigides soit de compression des racines pour les prothèses élastiques ou souples; It has none of the aforementioned drawbacks or rupture for the prothesis or compression of the roots for the elastic or flexible prostheses; ceci résultant de son mode de travail particulier en flexion assurant une rigidité suffisante associée à une certaine souplesse dans tous les mouvements exercés par le patient. this resulting from its particular way of working in bending ensuring sufficient rigidity associated with a certain flexibility in all the movements carried out by the patient.

Les matériaux utilisés sont biocompatibles et l'aspect extérieur est poli miroir ou mat. The materials used are biocompatible and appearance is mirror polished or matte.

Des essais en fatigue effectués par le Laboratoire National D'Essais ont montré que la limite de fatigue de 10 cycles avait été dépassée, sans rupture, sur un dispositif selon l'invention ce qui caractèrise le fait que, statistiquement en conformité avec la courbe de Wohler, aucun changement structurel ne devrait plus apparaître au cours de la poursuite de l'essais. Fatigue tests carried out by the National Laboratory Tests have shown that the fatigue limit of 10 cycles had been exceeded, without breaking, a device according to the invention characterizes the fact that statistically in accordance with the curve Wohler, no structural changes should no longer appear in the continuation of the tests.

Le système offre une rigidité progressive dans les mouvements permis (plus l'amplitude du mouvement est grande, plus la force de flexion est grande). The system provides progressive rigidity permits movements (more range of motion, the greater the bending force is large).

Enfin des greffons osseux (9) implantés au moment de l'intervention chirurgicale dans les interstices osseux, enrobent la prothèse de manière à reconstituer ainsi, un pont intervertébral de consolidation. Finally bone grafts (9) implanted during surgery in bone gaps, coat the prosthesis so as to reconstitute as a bridge intervertebral consolidation.

Claims (5)

REVENDICATIONS
1 - Dispositif prothètique à vis pédiculaires caractérisé en ce qu'il comporte une tige flexible centrale (6) entourée coaxialement et hélicoidalement d'une pluralité de tiges flexibles (71,72. ); 1 - prosthetic device to pedicle screws characterized in that it comprises a central flexible rod (6) coaxially and helically surrounded with a plurality of flexible rods; (71,72). lesdites tiges étant réunies et fixées solidairement en chacune de leur extrémité par un capuchon (81b,82), ce qui permet audit dispositif d'être fixé auxdites vis pédiculaires selon la manière habituelle. said rods being joined and fixed integrally in each end by a cap (81b, 82), allowing said device to be secured to said pedicle screws in the usual way.
2 - Dispositif prothètique à vis pédiculaires selon la revendication 1 caractérisé en ce que le mode de fixation des tiges (6-71,72...) dans les capuchons (81,82) est réalisé par soudage laser ou faisceaux d'électrons. 2 - Device prosthetic pedicle screw according to claim 1 characterized in that the rods fastening guide (6-71.72 ...) into the caps (81,82) is carried out by laser welding or electron beams.
3 - Dispositif prothètique selon l'une quelconque des revendications 1 ou 2 caractérisé en ce que le dispositif est réalisé en des matériaux biocompatibles et présente un état de surface poli miroir ou mat. 3 - Prosthetic device according to any one of claims 1 or 2 characterized in that the device is made of biocompatible material and has a polished mirror surface finish or matte.
4 - Dispositif prothètique selon la revendication 1 caractérisé en ce que des greffons osseux (9) sont implantés dans les interstices et enrobent la prothèse de manière à consolider de pont intervertébral. 4 - prosthetic device according to claim 1 characterized in that the bone graft (9) are implanted into the interstices and coat the prosthesis so as to consolidate intervertebral bridge.
5 - Dispositif prothètique selon l'une quelconque des revendications 1 à 4 caractérisé en ce qu'il peut intéresser plusieurs étages vertébraux. 5 - Prosthetic device according to any one of claims 1 to 4 characterized in that it may include several vertebral levels.
FR9602731A 1996-03-05 1996-03-05 Prosthetic vertebral support device Withdrawn FR2745706A1 (en)

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Cited By (21)

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DE10004712C1 (en) * 2000-02-03 2001-08-09 Aesculap Ag & Co Kg Bone plate for bone fracture or fixing adjacent vertebrae has intermediate section between plate-shaped regions secured to fracture sections or vertebrae provided with transverse slits
WO2002041797A1 (en) * 2000-11-22 2002-05-30 Sanatmetal Kft. Set of surgical instruments for the fixation of vertebrae
WO2002080787A2 (en) * 2001-04-06 2002-10-17 Michael Hahn Fixator and method for fixing a section of a spinal column
EP1281364A3 (en) * 2001-08-01 2004-01-07 Showa IKA Kohgyo Co., Ltd. Bone connector
WO2005072631A1 (en) 2004-01-30 2005-08-11 Sanatmetal Kft. Set of surgical equipment for the fixing of bone pieces
EP1628563A2 (en) * 2003-05-23 2006-03-01 Globus Medical, Inc. Spine stabilization system
WO2006079531A1 (en) * 2005-01-26 2006-08-03 Aesculap Ag & Co. Kg Self-contouring spinal rod
US7604653B2 (en) 2003-04-25 2009-10-20 Kitchen Michael S Spinal curvature correction device
US7708778B2 (en) 2003-08-05 2010-05-04 Flexuspine, Inc. Expandable articulating intervertebral implant with cam
US7785351B2 (en) 2003-08-05 2010-08-31 Flexuspine, Inc. Artificial functional spinal implant unit system and method for use
US7909869B2 (en) 2003-08-05 2011-03-22 Flexuspine, Inc. Artificial spinal unit assemblies
US7959677B2 (en) 2007-01-19 2011-06-14 Flexuspine, Inc. Artificial functional spinal unit system and method for use
US8118869B2 (en) 2006-03-08 2012-02-21 Flexuspine, Inc. Dynamic interbody device
US8157844B2 (en) 2007-10-22 2012-04-17 Flexuspine, Inc. Dampener system for a posterior stabilization system with a variable length elongated member
US8162994B2 (en) 2007-10-22 2012-04-24 Flexuspine, Inc. Posterior stabilization system with isolated, dual dampener systems
US8182514B2 (en) 2007-10-22 2012-05-22 Flexuspine, Inc. Dampener system for a posterior stabilization system with a fixed length elongated member
US8187330B2 (en) 2007-10-22 2012-05-29 Flexuspine, Inc. Dampener system for a posterior stabilization system with a variable length elongated member
US8267965B2 (en) 2007-10-22 2012-09-18 Flexuspine, Inc. Spinal stabilization systems with dynamic interbody devices
US8465526B2 (en) 2007-04-30 2013-06-18 Globus Medical, Inc. Flexible spine stabilization system
US8523912B2 (en) 2007-10-22 2013-09-03 Flexuspine, Inc. Posterior stabilization systems with shared, dual dampener systems
US9492288B2 (en) 2013-02-20 2016-11-15 Flexuspine, Inc. Expandable fusion device for positioning between adjacent vertebral bodies

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