CA2451989C - Vertebral cage device with modular fixation - Google Patents

Vertebral cage device with modular fixation Download PDF

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Publication number
CA2451989C
CA2451989C CA002451989A CA2451989A CA2451989C CA 2451989 C CA2451989 C CA 2451989C CA 002451989 A CA002451989 A CA 002451989A CA 2451989 A CA2451989 A CA 2451989A CA 2451989 C CA2451989 C CA 2451989C
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CA
Canada
Prior art keywords
cage
intervertebral
vertebrae
drilling
fixation
Prior art date
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Expired - Fee Related
Application number
CA002451989A
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French (fr)
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CA2451989A1 (en
Inventor
Christian Louis
Jean Huppert
Patrick Tropiano
Thierry Dufour
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LDR Medical SAS
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LDR Medical SAS
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Publication of CA2451989A1 publication Critical patent/CA2451989A1/en
Application granted granted Critical
Publication of CA2451989C publication Critical patent/CA2451989C/en
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Expired - Fee Related legal-status Critical Current

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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2/44—Joints for the spine, e.g. vertebrae, spinal discs
    • A—HUMAN NECESSITIES
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    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2/44—Joints for the spine, e.g. vertebrae, spinal discs
    • A61F2/4455—Joints for the spine, e.g. vertebrae, spinal discs for the fusion of spinal bodies, e.g. intervertebral fusion of adjacent spinal bodies, e.g. fusion cages
    • 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
    • A61B17/84—Fasteners therefor or fasteners being internal fixation devices
    • A61B17/86—Pins or screws or threaded wires; nuts therefor
    • A—HUMAN NECESSITIES
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    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
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    • A61F2/4455—Joints for the spine, e.g. vertebrae, spinal discs for the fusion of spinal bodies, e.g. intervertebral fusion of adjacent spinal bodies, e.g. fusion cages
    • A61F2/4465—Joints for the spine, e.g. vertebrae, spinal discs for the fusion of spinal bodies, e.g. intervertebral fusion of adjacent spinal bodies, e.g. fusion cages having a circular or kidney shaped cross-section substantially perpendicular to the axis of the spine
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    • A61B17/064—Surgical staples, i.e. penetrating the tissue
    • A61B17/0642—Surgical staples, i.e. penetrating the tissue for bones, e.g. for osteosynthesis or connecting tendon to bone
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    • 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
    • A61B17/7059—Cortical plates
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    • A61F2002/30001—Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
    • A61F2002/30108—Shapes
    • A61F2002/3011—Cross-sections or two-dimensional shapes
    • A61F2002/30112—Rounded shapes, e.g. with rounded corners
    • A61F2002/30131—Rounded shapes, e.g. with rounded corners horseshoe- or crescent- or C-shaped or U-shaped
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    • A61F2002/30329—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
    • A61F2002/30433—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements using additional screws, bolts, dowels, rivets or washers e.g. connecting screws
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    • A61F2002/30476—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements locked by an additional locking mechanism
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    • A61F2002/30535—Special structural features of bone or joint prostheses not otherwise provided for
    • A61F2002/30576—Special structural features of bone or joint prostheses not otherwise provided for with extending fixation tabs
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Abstract

The present invention concerns a modular arthrodesis device, used to enable fusing of two contiguous vertebrae by development of bony tissues with replacement of fibrocartilaginous discs ensuring the bonding between the vertebrae of the vertebral column or the end of the latter, and including interchangeable types of fixation means. Intervertebral arthrodesis device designed to be inserted in an intervertebral space (E) separating the opposi te plates (V0) of two adjacent vertebrae (V), characterised in that it comprise s at least one structure called intervertebral cage (1) presenting the shape o f a ring that mayor may not be open, in which at least one part, along the axi s of the spine, has a lower height that the rest of this same cage and forms a small bar (12) crossed by at least one drilling (121, 122) of the axis approximately perpendicular to the plate (V0) of at least one of the adjacen t vertebrae (V).

Description

VERTEBRAL CAGE DEVICE WITH MODULAR FIXATION
The present invention concerns an arthrodesis device, used to enable fusing of two contiguous vertebrae by development of bony tissues with replacement of fibrocartilaginous discs ensuring the bonding between the vertebrae of the vertebral column or the end of the latter.
The intervertebral discs are formed from a deformable but not compressible part called "nucleus pulposus" containing approximately 80%
water, surrounded by several elastic fibrous layers uniting to maintain the nucleus, absorbing part of the forces applied to the disc unit, and stabilizing the articulation. These parts may often be degraded by compression, 1 o displacement or wear and tear, following shocks, infections, exaggerated forces or simply over time. The degradation of this arkiculation part may cause intense pain in the patient and significant discomfort.
In a good number of cases, the treatment consists of removing all or part of the damaged intervertebral disc and connecting the vertebrae 1 s concerned by causing bony fusion between them. To do that, one places between the vertebrae an artificial structure allowing their separation to be maintained, while with it introducing into the intervertebral space either a bony graft or a bony substitute, compounded material that will be invaded by the growth of adjacent bony tissues. This structure often takes the shape of
2 o an open or closed ring called cage, and may be positioned on the basis of a cage by the intervertebral space in the case of cervical vertebrae, or on the basis of one or two cages by the intervertebral space in the case of lumbar vertebrae. This positioning is done most often by the anterior surface of the vertebrae in the case of a cervical cage, or by the anterolateral surface of the 2 s vertebrae (one cage) or posterior (two cages) of vertebrae in the case of a lumbar cage. As for grafts and bony substitutes, they are introduced in the cage either before or after its positioning and are therefore found in contact with the two vertebrae surrounding the treated intervertebral space.
During the time necessary for growth and up to the reinforcement of
3 o arthrodesis, which may be on the order of six months, it is important that the various movements of forces taking place in the intervertebral space do not cause displacement of the cage, which would then risk deteriorating the bony tissues during formation or even escaping outside this space and damaging the adjacent organs.
To avoid such displacements, a solution used consists of equipping the surfaces of the cage in contact with the vertebrae with varieties of shape such as saw tooth notches as described in the patents FR0006351 or FR2733413. Such a solution however proves to be insufficient in a certain number of cases.
io Another solution consists of equipping the cage with a flange that extends on the outside of the intervertebral space and is applied on the side of each of the two contiguous vertebrae, to which it is fixed by a bone anchoring screw. Such a solution has been used since about 1988 and is described for example in the patent FR 2 747 034. Such a plate however i5 represents an overcrowding outside the intervertebral space that sometimes may pose problems in particular in the case of arthrodesis of the cervical vertebrae where the space available is very limited. In fact, the presence of the plate may for example form a daily discomfort for the patient or form an immediate or future obstacle in the positioning of another cage with plate in 20 one of the immediately adjacent plates.
Furthermore, in particular in the case of cervical vertebrae, the movements of the spine often have the tendency to cause loosening of the bone anchoring screws, which decreases the effectiveness of such a plate and may also cause damages to the organs surrounding the plate.
2 s Therefore, it is worthwhile to also provide for a system enabling fixation of the cage without a part extending outside the intervertebral space.
Moreover, these different solutions may fulfil the needs of an arthrodesis operation differently without it being necessarily possible to know in advance which will be preferable. Therefore, it is easier and less expensive 3 o to provide for a modular device comprising interchangeable parts for achieving different solutions.

To remedy some of these drawbacks, the present invention proposes an intervertebral arthrodesis device designed to be inserted in an intervertebral space separating the opposite plates of the two adjacent vertebrae, characterised in that it comprises at least one structure called s intervertebral cage presenting the shape of a ring that may or may not be open, in which at least one part, along the axis of the spine, has a lower height than the rest of this same cage and forms a small bar crossed by at least one drilling of the axis approximately perpendicular to the plate of at least one of the adjacent vertebrae.
1 o According to one characteristic, the device is characterised in that at least one intervertebral cage includes on its surfaces in contact with the vertebrae, variations in shape limiting its possibilities for sliding in a plane parallel to said vertebrae.
According to one characteristic, the device is characterised in that it 15 comprises fixation means of the cages) to at least one of these vertebrae, these fixation means being able to be added to at least one intervertebral cage by insertion of a projecting part in at least one drilling of the cage.
According to one characteristic, the device is characterised in that the fixation means comprise at least two bone anchoring pins with approximately 2 o parallel axes connected by small rod, these anchoring pins pushed in the plate of at least one vertebra and inserting in at least one drilling of at least one intervertebral cage to keep this same cage in position in the intervertebral space.
According to one characteristic, the device is characterised in that at 25 least one of the bone anchoring pins of fixation means includes reliefs limiting the possibilities of sliding outside the plate where it is impacted.
According to one characteristic, the device is characterised in that the fixation means comprise at least one fixation plate fixed to the external surface of at least one vertebra and including at least one drilling receiving a 3 o bone anchoring screw fixed to this same vertebra.
According to one characteristic, the device is characterised in that at least one of the drillings of the fixation plate presents in the plane of this plate
4 a section at the level of its opening opposite the vertebra that is not as high as in its part located within the thickness of the plate, this drilling through which is inserted a bone anchoring screw the head of which presents at least one part of a section greater than that of this opening of the drilling and is thus retained within this same drilling by this same external opening.
According to one characteristic, the device is characterised in that the fixation means include at least two locking studs with approximately parallel axes connected by a small rod, these locking studs inserting in at least one drilling of at least one intervertebral cage to lock these same fixation means 1 o to this same cage and to keep it in position in the intervertebral space.
According to one characteristic, the device is characterised in that at least one of the ends of the small rod presents at least one protuberance clipped in at least one housing arranged in the wall of the intervertebral cage so as to limit or prevent the movements of this same rod relative to this same cage.
According to one characteristic, the device is characterised in that the fixation means comprise a fixation plate called hemiplate coupled to the exterior surface of at least one vertebra, this plate including at least one drilling through which is inserted a bone anchoring screw fixed in said 2 o vertebra to keep this same cage in position in the intervertebral space.
According to one characteristic, the device is characterised in that the fixation hemiplate with the small rod connecting the anchoring pins or the locking studs forms a piece with an "L" section.
According to one characteristic, the device is characterised in that the 2 5 fixation means comprise a fixation plate called complete coupled to the exterior surface of at least two vertebrae, this plate including near each end at least one drilling through which is inserted a bone anchoring screw fixed in said vertebrae to prevent any migration of the intervertebral cage within or outside the intervertebral space.
3 o According to one characteristic, the device is characterised in that the complete fixation plate with the small rod connecting the anchoring pins or the locking studs a piece with a "T" section.

According to one characteristic, the device is characterised in that the fixation plate includes an opening at the level of the intervertebral space, this opening enabling the introduction or packing of graft or bone substitute in this intervertebral space after insertion of the device.
According to one characteristic, the device is characterised in that each drilling of the fixation means acting together with a bone anchoring screw, once in place, is located in a position shifted relative to a plane containing the axis of the spine.
According to one characteristic, the device is characterised in that at to least one intervertebral cage presents, along the axis of the spine, a nonuniform height, this variation in height inducing a determined angle between the plates in respect to the adjacent vertebrae.
According to one characteristic, the device is characterised in that at least one of its constitutive parts is a made from a radiotransparent material.
The invention, with its characteristics and advantages, will be more clearly evident with the reading of the description made in reference to the fixed drawings in which:
- figure 1 a represents a side sectional view of the device according to the invention in an embodiment where the fixation device comprises 2 o anchoring pins and a top hemiplate;
- figure 1 b represents a side sectional view of the device according to the invention in an embodiment where the fixation device comprise a complete plate, with opening, added by locking studs and with anchoring screws retained in the drillings of the plate;
2 s - figure 2 represents a top sectional view of the device according to the invention in an embodiment where the fixation device comprises anchoring pins and a low hemiplate;
- figure 3a represents a view in perspective of an intervertebral cage according to the invention;
30 - figure 3b represents a view in perspective of a device according to the invention before impacting pins in an embodiment where the fixation device comprises anchoring pins with variations in shape;

- figure 3c represents a view in perspective of a device according to the invention before impacting "V" shape tongues in an embodiment where the fixation device comprises anchoring "V" shape tongues;
- figure 4a represents a view in perspective of a device according to s the invention in an embodiment where the fixation device comprises anchoring pins and a low hemiplate;
- figure 4b represents a view in perspective of a device according to the invention in an embodiment where the fixation device comprises anchoring pins and a top hemiplate with opening;
to - figure 5a represents a view in perspective of a device according to the invention in an embodiment where the fixation device comprises anchoring pins and a complete plate with opening;
- figure 5b represents a view in perspective of a device according to the invention in an embodiment where the fixation device comprises a 15 complete plate added by locking studs, illustrated with anchoring screws.
In one embodiment, an arthrodesis device according to the invention comprises at least one intervertebral cage (1 ) in the shape of a ring, designed to be inserted in the intervertebral space (E) to be treated between two contiguous vertebrae, and to be received into an interior cavity (10, figure 20 2a) a bony material acting as a graft, or any structure that may act as a bony substitute or be "assembled" by a growth of bony material. The cavity of the intervertebral cage may thus be filled before or after its positioning in the intervertebral space.
According to the applications, the device according to the invention 2 s may include a single intervertebral cage (1, figures 1 and 2a), for example to carry out arthrodesis between two cervical vertebrae.
According to the applications, the device according to the invention may include two intervertebral cages (not represented) for example to carry out arthrodesis between two lumbar vertebrae during positioning by the 3 o posterior route.

According to the applications, an intervertebral cage according to the invention may be made in the shape of a closed ring (1, figure 3a) or in the form of a ring opened on one side (not represented).
In one embodiment represented in figures 1 and 2a, the invention comprises a fixation device enabling its anchoring in the plate (V0) of a vertebra (V) within the intervertebral space (E) to be treated. This fixation device is formed from two anchoring pins (21, 22), with approximately parallel axes and connected by a small rod (23). These anchoring pins are introduced into two drillings (121, 122) made in a thinned down part of the to intervertebral cage, then are impacted, that is pushed in with force, into the bony material forming the plate of one of the two vertebrae surrounding the intervertebral space to be treated.
In one embodiment, the thinned down part of the cage forms a small flat rod (12) on which the small rod (23) is abutted, it is also flat, connecting 15 the two anchoring pins (21, 22) when the latter are impacted in the plate (V0) of a vertebra (V). The thickness of the small rod (23) connecting the anchoring pins and the small rod (12) formed by a thinning of the intervertebral cage (1 ) are determined so that the superimposition of the two small rods (12, 23) after impacting are not higher along the axis of the spine 2 o than the rest of the intervertebral cage (1 ).
In one embodiment represented in figure 3b the length of the anchoring pins (21, 22) and the thickness of the small rod (23) connecting them are determined so that the sum of these two dimensions forming the height of the fixation device in this embodiment is not greater than the height 2 s along the axis of the spine of the rest of the intervertebral cage (1 ).
Thus, it is possible to introduce into this intervertebral space an intervertebral cage already provided with anchoring pins, the latter then only having been impacted into the plate (V0) of a vertebra (V) for example with the aid of a spreader, a distractor or another tool of known type.
3o In one embodiment represented in figure 3c, the fixation device, enabling the device anchoring in the plate (V0) of a vertebra (V) within the intervertebral space (E) to be treated, is constituted of two "V" shape anchoring tongues (51, 52), connected by a small rod (53). These anchoring tongues (51, 52) are introduced between a thinned down part of the intervertebral cage forming a small rod (62) and two lugs (only one, 54, is represented on figure 3c) formed on the device and symmetrically disposed s in relation to the device axis. The "V" shape anchoring tongues (51, 52) are then impacted, as in the case of the device provided with pins (21, 22), and the small flat rod (53), connecting the two "V" shape anchoring tongues (51, 52) can abut on the small rod (62), also flat, when the tongues are impacted impacted in the plate (V0) of a vertebra (V). The thickness of the small rod l o (53) connecting the anchoring tongues and the small rod (62) formed by a thinning of the intervertebral cage (1 ) are determined so that the superimposition of the two small rods (62, 53) after impacting are not higher along the axis of the spine than the rest of the intervertebral cage (1 ).
In one embodiment (not represented), the device according to the 15 invention comprises two intervertebral cages. These two cages are each formed from an open ring in which at least part presents a reduction in height along the axis of the spinal cord. In one embodiment, at least one of these same cages is in the shape of a "U" or "C" (not represented) and each includes at its end a small rod from one part presenting a reduction in height 2 o along the axis of the spine. These small rods are crossed by at least one drilling with axis approximately perpendicular to the plate (V0) of the vertebra (V) with which they are in contact. In one embodiment, two intervertebral cages are arranged in the intervertebral space with their openings facing each other and at least one fixation device including two anchoring pins with 2s parallel axes connected by a small rod is introduced into the drilling of each of the two small rods with ends facing each other. The anchoring pins are then impacted in the plate of the vertebra and insert in the drillings of the small rods of the intervertebral cages to help to keep said cages immovable.
In one embodiment, an intervertebral cage (1 ) used in a device 3 o according to the invention includes on at least one of its surfaces in contact with the vertebrae (V) variations in shape (11 ) for example, in saw tooth [misspelled word; shape]. Under the pressure exerted by the vertebrae surrounding the treated intervertebral space (E), these variations in shape are supported on the surface of the plates (V0) of these same vertebrae and thus limit the risks of displacement of this same intervertebral cage.
In one embodiment represented in figures 1, 2a and 4b a fixation device used in the device according to the invention comprises a plate called top hemiplate (32) united with the small rod (23) connecting the anchoring pins (21, 22) to each other, which extends outside the intervertebral space (E) to be treated and is coupled to the exterior surface of the vertebra opposite the vertebra receiving the anchoring pins. This top hemiplate to includes at least one drilling (321) which receives a bone anchoring screw (4) of a known type, this screw (4) being fixed in the body of the vertebra and inserting in the plate to prevent any migration of the intervertebral cage (1 ) within or outside the treated intervertebral space (E). This top hemiplate also comprises an opening (320) enabling introduction of the graft into the cage (1 ) after its positioning in the intervertebral space. The part of the piece connecting the small rod (23) and the top hemiplate (32) then presents an "L"
shape.
In one embodiment represented in figure 4a, a plate called bottom hemiplate (31 ) is fixed in the same way to the vertebra receiving the 2 o anchoring pins. The part of the piece connecting the small rod (23) and the bottom hemiplate (31 ) then presents an "L" shape.
In one embodiment represented in figure 5a, a fixation device used in the device according to the invention comprises a plate called complete plate (33) integral with the small rod (23) connecting the anchoring pins (21, 22) to 2 5 each other, which extends to the exterior of the intervertebral space (E) to be treated and is coupled to the exterior surface of these two vertebrae surrounding the intervertebral space (E) to be treated. The part of the piece connecting the small rod (23) and the complete plate (33) then presents a "T"
shape. This complete plate (33) includes at least two drillings (331, 332) 3 o which each receive a bone anchoring screw (4) of a known type, this screw (4) being fixed in the body of the corresponding vertebra and inserting in the plate to prevent any migration of the intervertebral cage (1 ) within or outside the treated intervertebral space (E). This complete plate also comprises an opening (330) enabling introduction of the graft into the cage (1 ) after its placement in the intervertebral space.
In one embodiment represented in figure 1 b and 5a, a fixation device s used in the device according to the invention comprises a plate called complete plate (33) united with the small rod (23), this small rod including two locking studs (24, 25) perpendicular to its longitudinal axis and which is housed in the two drillings (121, 122) of the intervertebral cage (1).This complete plate (33) extends outside the intervertebral space (E) to be treated to and it coupled to the exterior surface of the two vertebrae surrounding the intervertebral space (E) to be treated. The fact of using locking studs rather then pins makes it possible to use a material that would not be as hard to be impacted into the plate of the vertebra, but on the other hand presents the advantage of being transparent during radiography. The part of the piece is connecting the small rod (23) and the complete plate (33) then presents a "T"
shape in its section along a plane containing the axis of the spine.
This complete plate (33) includes at least two drillings (331, 332) which each receive a bone anchoring screw (4) of a known type, this screw (4) being fixed in the body of the corresponding vertebra and inserting in the 2 o plate to prevent any migration of the intervertebral cage (1 ) within or outside the treated intervertebral space (E).
In one embodiment represented in figure 5a, the small rod (23) connecting the locking studs and the complete plate (33) presents at its two ends in contact with the walls of the intervertebral cage (1 ) a rounded 2 s protuberance being clipped by elastic deformation in a housing (13) arranged in the wall opposite the intervertebral cage (1 ). The clipping of the protuberances (233) in the housings (13) makes it possible to maintain the cage (1 ) and the plate (33) together during positioning of the unit or after positioning.
3 o In one embodiment, so as to avoid anchoring screws from loosening for example under the effect of the movements of the spine, the drillings of the plate (33) receiving the screws in a plane parallel to the plate present a section slightly lower than the interior of the plate at the level of their opening on the surface opposite the vertebra, called external. The head of the screws presents a part of a section greater than that of the external opening of the drilling. Thus, once screwed to where the large part of the head of the screw s had penetrated the interior of the drilling under force, the elasticity of the material forming the plate will retain this head within the drilling, limiting the risks of later loosening. This complete plate also comprises an opening (330) enabling introduction of the graft into the cage (1 ) after its positioning in the intervertebral space.
to In one embodiment the plate (31, 32, 33) of the fixation device according to the invention includes at least one of its drillings (311, 321, 331, 332) receiving a bone anchoring screw (4) which is located in a position shifted relative to a plane containing the axis of the spine. Thus, it is possible to treat two adjacent intervertebral spaces by using fixation plates and by is positioning these plates in staggered rows, the shifted position of their drillings enabling them to be fixed by different screws located on the same vertebra and at the same height along the axis of the spine.
In one embodiment, all or part of the device according to the invention is made from a radiotransparent material, for example from PEEK, which 2 o makes it possible to monitor the development of bony tissues within the cage by radiography. In spite of that, for verification that the elements of the device are not displaced, it is possible to fix on one or more of the elements a radio marker containing for example a small piece of non-radiotransparent material.
2 s Therefore, according to the applications it is possible to position an intervertebral cage (1 ) in different ways, simply by using one type or another of fixation device. The same intervertebral cage (1 ) may for example be positioned:
- either alone, 3 0 - or provided with a fixation device with pins (21, 22, 23), - or provided with a fixation device with pins and with a top (32) or bottom (33) hemiplate, - or provided with a fixation device with pins and with a complete plate (33), - or provided with a top (32) or bottom (31 ) hemiplate added by locking studs (24, 25), - or provided with a complete plate (33) added by locking studs (24, 25).
Such modularity may make it possible for the surgeon to choose the type of fixation during the surgery and according to the anatomic conditions he encounters, by having at his disposal a reduced number of components 1 o among which to choose.
It is also to be noted that the fixation device that is concerned for example with pins or a plate or both, may be later removed without significant destruction of the arthrodesis carried out, for example during a new surgery.
In fact, this device may no longer be necessary after reinforcement of the is arthrodesis, although forming discomfort, either for the patient or for similar treatment of an adjacent intervertebral space.
It must be obvious for persons skilled in the art that the present invention makes possible embodiments under numerous other specific forms without leaving the field of application of the invention as claimed. As a result, 2 o the present embodiments must be considered as illustration, but may be modified in the field defined by the scope of the fixed claims, and the invention must not be limited by the details given above.

Claims (18)

1. Intervertebral arthrodesis device designed to be inserted in an intervertebral space separating opposite plates of two adjacent vertebrae of a spine, said device comprising at least one intervertebral cage presenting the shape of a ring, at least a first part of said cage having a lower height, taken along the axis of the spine, than a second part thereof, and forming a bar, said bar of the cage comprising at least one opening extending along the bar, for insertion of a projecting part of fixation means for anchoring the cage to at least one of the two adjacent vertebrae.
2. The device according to claim 1, wherein said intervertebral cage includes, on surfaces thereof in contact with the two adjacent vertebrae, variations in shape limiting possibilities of the cage for sliding in a plane parallel to the plates of said vertebrae.
3. The device according to any one of claims 1 and 2, wherein said fixation means are added to said intervertebral cage by insertion of the projecting part in at least one drilling crossing the bar of the cage, the axis of said at least one drilling being approximately perpendicular to one of the plates.
4. The device according to claim 3, wherein the fixation means comprise at least two bone anchoring pins with approximately parallel axes connected by a rod, said at least two bone anchoring pins being pushed in the plate of one of the vertebrae and inserted in the at least one drilling crossing the bar of the cage to keep said intervertebral cage in position in the intervertebral space.
5. The device according to claim 4, wherein at least one of the two bone anchoring pins includes relief limiting possibilities of sliding outside the plate where it is impacted.
6. The device according to any one of claims 1 to 5, wherein the fixation means comprise at least one fixation plate coupled to an external surface of at least one of the vertebrae and including at least one drilling receiving a bone anchoring screw fixed to said at least one vertebra.
7. The device according to claim 6, wherein at least one of the drillings receiving a bone anchoring screw of the at least one fixation plate presents, in the plane of said at least one fixation plate, a section, at a level of an opening thereof opposite the vertebra, that is of at least the same length as a part thereof located within the thickness of the at least one fixation plate, said drilling through which is inserted said bone anchoring screw, a head of which presents at least one part of a section greater than a section of said opening of the drilling and is thus retained within this drilling by said opening.
8. The device according to claim 3, wherein the fixation means include at least two locking studs with approximately parallel axes connected by a rod, said at least two locking studs inserting in at least one of the drillings crossing the bar of said cage to lock said fixation means to said cage and to keep it in position in the intervertebral space.
9. The device according to any one of claims 4 and 8, wherein at least one end of the rod presents at least one protuberance clipped in at least one housing arranged in a wall of the intervertebral cage so as to at least limit a movement of said rod relative to said intervertebral cage.
10. The device according to claim 9, wherein the fixation means comprises a hemiplate coupled to an exterior surface of at least one of the vertebrae, said hemiplate including at least one drilling through which is inserted a bone anchoring screw fixed in said vertebra to keep said intervertebral cage in position in the intervertebral space.
11. The device according to claim 10, wherein the hemiplate with the connecting rod form a piece with an "L" section.
12. The device according to any one of claims 4 and 8, wherein the fixation means comprises a fixation plate coupled to exterior surfaces of at least said two vertebrae, said fixation plate including near each end thereof at least one drilling through each of which is inserted a bone anchoring screw fixed in said vertebrae to prevent any migration of the intervertebral cage within and outside the intervertebral space.
13. The device according to claim 12, wherein the complete fixation plate with the connecting rod form a piece with a "T" section.
14. The device according to any one of claims 6, 7, 10, 11, 12, and 13, wherein the fixation plate includes an opening at the level of the intervertebral space, said opening enabling introduction and packing of graft and bony substitute in the intervertebral space after insertion of the device.
15. The device according to claim 14, wherein each drilling of the fixation means acting together with said bone anchoring screw, once in place, is located in a position shifted relative to a plane containing the axis of the spine.
16. The device according to claim 1, wherein said intervertebral cage presents a non-uniform height taken along the axis of the spine, which induces a determined angle between the plates in respect to the adjacent vertebrae.
17. The device according to any one of the claims 1 to 16, comprising at least one constitutive part made from a radiolucent material.
18. The device according to any one of claims 1 and 2, wherein the fixation means is added to the intervertebral cage by insertion of the projecting part between the bar and two lugs formed on the device, the fixation means comprising at least two "V" shape anchoring tongues, connected by a rod.
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FR0109381A FR2827156B1 (en) 2001-07-13 2001-07-13 VERTEBRAL CAGE DEVICE WITH MODULAR FASTENING
FR01/09381 2001-07-13
PCT/IB2002/003390 WO2003005939A2 (en) 2001-07-13 2002-07-12 Vertebral cage device with modular fixation

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