WO2010037926A1 - Intervertebral disc - Google Patents

Intervertebral disc Download PDF

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Publication number
WO2010037926A1
WO2010037926A1 PCT/FR2009/001153 FR2009001153W WO2010037926A1 WO 2010037926 A1 WO2010037926 A1 WO 2010037926A1 FR 2009001153 W FR2009001153 W FR 2009001153W WO 2010037926 A1 WO2010037926 A1 WO 2010037926A1
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WO
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Patent type
Prior art keywords
blades
blade
plates
plate
respectively
Prior art date
Application number
PCT/FR2009/001153
Other languages
French (fr)
Inventor
Hassan Razian
Original Assignee
Hassan Razian
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Filing date
Publication date

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Classifications

    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS 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
    • A61F2/00Filters 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
    • A61F2/02Prostheses implantable into the body
    • A61F2/30Joints
    • A61F2/44Joints for the spine, e.g. vertebrae, spinal discs
    • A61F2/442Intervertebral or spinal discs, e.g. resilient
    • A61F2/4425Intervertebral or spinal discs, e.g. resilient made of articulated components
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS 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
    • A61F2/00Filters 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
    • A61F2/02Prostheses implantable into the body
    • A61F2/30Joints
    • A61F2002/30001Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
    • A61F2002/30316The prosthesis having different structural features at different locations within the same prosthesis; Connections between prosthetic parts; Special structural features of bone or joint prostheses not otherwise provided for
    • A61F2002/30329Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
    • A61F2002/30331Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements made by longitudinally pushing a protrusion into a complementarily-shaped recess, e.g. held by friction fit
    • A61F2002/30378Spherically-shaped protrusion and recess
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS 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
    • A61F2/00Filters 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
    • A61F2/02Prostheses implantable into the body
    • A61F2/30Joints
    • A61F2002/30001Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
    • A61F2002/30316The prosthesis having different structural features at different locations within the same prosthesis; Connections between prosthetic parts; Special structural features of bone or joint prostheses not otherwise provided for
    • A61F2002/30329Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
    • A61F2002/30471Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements connected by a hinged linkage mechanism, e.g. of the single-bar or multi-bar linkage type
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS 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
    • A61F2/00Filters 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
    • A61F2/02Prostheses implantable into the body
    • A61F2/30Joints
    • A61F2002/30001Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
    • A61F2002/30316The prosthesis having different structural features at different locations within the same prosthesis; Connections between prosthetic parts; Special structural features of bone or joint prostheses not otherwise provided for
    • A61F2002/30535Special structural features of bone or joint prostheses not otherwise provided for
    • A61F2002/30537Special structural features of bone or joint prostheses not otherwise provided for adjustable
    • A61F2002/30556Special structural features of bone or joint prostheses not otherwise provided for adjustable for adjusting thickness
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS 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
    • A61F2/00Filters 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
    • A61F2/02Prostheses implantable into the body
    • A61F2/30Joints
    • A61F2002/30001Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
    • A61F2002/30316The prosthesis having different structural features at different locations within the same prosthesis; Connections between prosthetic parts; Special structural features of bone or joint prostheses not otherwise provided for
    • A61F2002/30535Special structural features of bone or joint prostheses not otherwise provided for
    • A61F2002/30579Special structural features of bone or joint prostheses not otherwise provided for with mechanically expandable devices, e.g. fixation devices
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS 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
    • A61F2/00Filters 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
    • A61F2/02Prostheses implantable into the body
    • A61F2/30Joints
    • A61F2002/30001Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
    • A61F2002/30621Features concering the anatomical functioning or articulation of the prosthetic joint
    • A61F2002/30649Ball-and-socket joints
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS 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
    • A61F2/00Filters 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
    • A61F2/02Prostheses implantable into the body
    • A61F2/30Joints
    • A61F2002/30001Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
    • A61F2002/30621Features concering the anatomical functioning or articulation of the prosthetic joint
    • A61F2002/30649Ball-and-socket joints
    • A61F2002/30662Ball-and-socket joints with rotation-limiting means
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS 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
    • A61F2220/00Fixations or connections for prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
    • A61F2220/0025Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
    • A61F2220/0033Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements made by longitudinally pushing a protrusion into a complementary-shaped recess, e.g. held by friction fit
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS 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
    • A61F2220/00Fixations or connections for prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
    • A61F2220/0025Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
    • A61F2220/0091Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements connected by a hinged linkage mechanism, e.g. of the single-bar or multi-bar linkage type
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS 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
    • A61F2250/00Special features of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
    • A61F2250/0004Special features of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof adjustable
    • A61F2250/0009Special features of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof adjustable for adjusting thickness

Abstract

The invention relates to intervertebral discs that can be placed between two vertebral bodies Cv1, Cv2. The disc of the invention is essentially characterised in that it comprises a plate (10) comprising a surface (11) contacting the vertebral body (Cv1) and an opposite surface (12), a blade (13) capable of assuming at least two positions (15, 16), a second plate (20) comprising a surface (21) contacting the vertebral body (Cv2) and an opposite surface (22), a blade (23) capable of assuming at least two positions (25, 26), and a means (30) mounted so as to engage with the two plates (10, 20) so that said two plates can pivot relative to each other about three different axes. The invention can be used in the field of intervertebral discs for replacing a damaged intervertebral disc.

Description

INTERVERTEBRAL DISC

The present invention relates to intervertebral discs adapted to be interposed between two consecutive vertebrae to replace a damaged intervertebral disc.

Known number of implantable intervertebral disc in the human body or the like in lieu of the disk between the two vertebral bodies and an intervertebral joint damaged, for example, following an accident or illness. These prostheses are, for the most part essentially consisting of two parts respectively integral with the two vertebral bodies of the joint and movably mounted relative to another, for example in the manner of a knee movement, such as for example described and illustrated in WO 2007/127771 and WO 2007/113807. The problem with this kind of prosthesis is the attachment of two parts of the two vertebral bodies, mainly because of the very small dimensions of the parts of the prosthesis and little free space between the two vertebral bodies between which consecutive must be implanted intervertebral disc replacement. Also, the present invention she aims to achieve an intervertebral disc which, while being a simple embodiment, overcomes much of the above mentioned disadvantages of the prior art discs, allowing implantation much easier and more secure.

More specifically, the present invention relates to an intervertebral disc adapted to be interposed between two consecutive first and second vertebral bodies to replace a damaged intervertebral disc, as defined in Claim 1 attached hereto.

Other features and advantages of the present invention appear from the following description given in the attached drawings for illustration but in no way limiting, in which:

Figure 1 is a block diagram of the structure of intervertebral disk according to the invention interposed between two vertebral bodies; Figure 2 is a schematic representation of a first embodiment of the intervertebral disc according to the invention in accordance with the block diagram according to Figure 1;

Figures 3 and 4 show two orthogonal views of a second embodiment of the intervertebral disc according to the invention, Figure 3 being a cross-sectional view of the disk inserted between two vertebral bodies, the section being indicated III-III in Figure 4 and Figure 4 being a top view with two unrepresented vertebral bodies.

It is first noted that the figures, the same references designate the same elements, whatever the figure in which they appear and regardless of the form of representation of these elements.

The present invention relates to an intervertebral disc adapted to be interposed between two consecutive first and second vertebral bodies Cv1, Cv2, to replace a damaged intervertebral disc for any reason whatsoever.

More particularly with reference to Figure 1, the disc includes a first plate 10 having a first face 11 capable of engaging the first vertebral body Cv1 and a second face 12 opposite the first face, a first blade 13 mounted in cooperation with said first plate, a second plate 20 having a first face 21 capable of engaging the second vertebral body Cv2 and a second face 22 opposite the first face, and a second blade 23 mounted in cooperation with the second tray.

The first blade 13 is mounted in cooperation with the first plate 10 so as to be capable of assuming at least two first and second positions 15, 16.

The first position referenced 15 is one in which the first blade 13 is completely contained within the first half-space delimited by the plane passing substantially through the first face 11 of first plate 10 and which contains the first plate 10. As to the second position 16 of the first blade 13, it is one in which a first end 17 of the first blade emerges in the second half-space delimited by the plane passing substantially through the first face of the first plate and which does not contain said first plate.

The second blade 23 is mounted in cooperation with the second tray 20 so as to be capable of assuming at least two first and second positions 25, 26.

The first position referenced 25 of the second blade 23 is that in which the second blade is fully contained within the first half-space delimited by the plane passing substantially through the first face 21 of second plate 20 and which contains the second tray. As to the second position 26, it is one in which a first end 27 of the second blade 23 emerges in the second half-space delimited by the plane passing substantially through the first face of the second plate and which does not contain the second tray.

The intervertebral disc further comprises means, illustrated schematically at 30 in Figure 1, mounted in cooperation with both the first and second trays 10, 20 to allow these two plates to rotate relative to each other about three non-coincident axes, for example the traditional three orthogonal axes of the well-known space physics. 2 shows, schematically, a first embodiment of these means 30 functionally defined above.

In this embodiment, these means 30 are constituted by the fact that both second sides 12, 22 of the two first and second trays 10, 20 are configured convex and concave spherical surfaces, respectively 31, 32 substantially congruent and pivotally mounted to in the other.

In this case of embodiment, the two blades 13, 23 are for example connected in rotation independently of each other relative respectively to each plate 10, 20 about an axis which may be located on one edge of these plates . However, this axis is preferably located in the housing leading to the respective first faces 11, 21 of the two plates, so that the first ends 17, 27 of the two blades respectively when they are in their second position 16, 26 are planted by cutting in the two vertebral bodies Cv1, Cv2.

The embodiment according to Figure 2 in accordance with the block diagram according to Figure 1, allows to replace a damaged intervertebral disc and restore the original relative movement therebetween, the two vertebral bodies. However, even if this realization reached the goals set in the preamble of the present description and presents advantages over the prior art drives, it does not have yet all the benefits that practitioners can expect from such a disk. The second embodiment of the intervertebral disc of the invention as illustrated in Figures 3 and 4, in accordance with the block diagram according to Figure 1, has advantages over the first embodiment according to Figure 2.

In this second embodiment, the means 30 functionally defined previously, consist in that the first and second blades 13, 23 are rotatably mounted relative to each other by their respective second ends 18, 28 opposite the first ends 17, 27, and that the two second ends are formed as spherical surfaces respectively concave and convex 41, 42 substantially congruent and arranged one inside the other in pivoting, the two blades 13, 23 being rotatably mounted substantially in their plane, between the second faces 12, 22 of the two plates 10, 20 and respectively passed through the through breakthroughs 45 of 46 made respectively in the two said trays. These means 30 also comprise, according to this second embodiment, means 50 for mounting the two plates 10, 20 respectively in cooperation with the two blades 13, 23 on the one hand bear these two plates, and the other the hand away from each other when the two blades 13, 23 move from their first position 15, 25 to their second position 16, 26.

In Figure 3, the first position 15, 25 of the two blades is shown in dotted lines, while the second position 16, 26 is shown in solid lines. In contrast, Figure 4 which is a top view of the disk in the same second embodiment, but without the vertebral bodies CVI 1 Cv2, shows in solid lines the two blades 13, 23 in their first position, and, in the purpose of better understanding of the structure of the disc in the second embodiment. In a particularly advantageous embodiment, the means 50 defined above for mounting the two plates 10, 20 respectively in cooperation with the two blades 13, 23 are constituted by two bearing surfaces 51, 52 integral with the two blades and respectively revolution about an axis substantially perpendicular to the two blades rotating plane, and by two sides 53, 54 complementary of the two bearing surfaces 51, 52 and carried respectively on the two second faces 12, 22 respectively of the two plates 10, 20, the two blades being mounted in cooperation with two plates so that the two bearing surfaces 51, 52 slide in rotation respectively in two complementary parts 53, 54 when the two blades pass from their first position 15, 25 to their second position 16, 26, and vice versa.

The bearing surfaces 51, 52 can be of any type, for example spherical. But, preferably, as shown, they will be circularly cylindrical and convex. In addition, the means 50 for mounting the two plates 10, 20 respectively in cooperation with the two blades 13, 23 for supporting these two trays and move them away from each other when the two blades move from their first position to their second position, are formed so that the overall thickness Eβ bearing surfaces 51, 52 integral with the two blades set to a straight line perpendicular to the axis of rotation of the blades and the line passing through the first ends 17, 27 of the two blades when the latter are substantially aligned, is less than the overall distance (D) between the two bearing surfaces 51, 52 defined on a straight line substantially parallel to the line passing through the first ends 17, 27 of the two blades when the latter are substantially aligned.

It is specified that, in the figures, each bearing surface 51, 52 associated with each blade is comprised of two support half-surfaces, one on each side of each blade. This achievement is preferred that the disc is perfectly balanced, achieving with one bearing half surface is however technically possible.

Advantageously, when at least one of the plates 10, 20 is made of a material having a non-zero creep coefficient, such as PEEK or the like, said plate further comprises reinforcing means 70, for example a lamina metal or the like on at least the additional portion 53, 54 formed on its second side 12, 22. One of these strips was shown, but it is obvious that each tray may comprise a plurality of such strips. Similarly, although only one plate is represented with a reinforcement, the two plates can include both such reinforcements.

Advantageously, for security purposes, the intervertebral disc may also include means 60 for limiting rotation of the two blades 13, 23 relative to one another in determined limits as well as means, shown schematically 90, to limit rotation and distancing of the two plates 10, 20 within determined limits.

These means of movement amplitude limitation 60 and 90 are well known in themselves and will not be further described here with the sole aim of simplifying the present description. As for the means 60, one of its possible embodiments is illustrated in Figure 4. As for the means 90, they can be simply made of a very loose fit between the two plates allowing both rotations trays and their distance from each other. These means are also in the field of the art.

To facilitate its implantation, the intervertebral disc may also comprise means 80 for controlling simultaneously the passage by rotation of the two blades, one of its two positions 15-25, 16-26 to the other and vice versa . These means 80 are constituted by at least one of these three embodiments: at least one stud on each blade, at least one notch 81, 82 formed in each blade 13, 23, at least one notch in a blade and at least one lug on the other. Furthermore, advantageously, the blades 13, 23 are configured to be able to cooperate with a fork with two teeth adapted to laterally clamp the two blades at their second end 18, 28 and having then in the background defined between two teeth, a complementary embodiment thereof 81, 82 which is formed on the two blades 13, 23.

This second embodiment of the intervertebral disc according to the invention illustrated in Figures 3 and 4, is used and operates in the following way:

When a practitioner wants to implement a disc according to this second embodiment, as is known, prior to this implementation, it proceeds to the elimination of the entire damaged disk, taking care to maintain récartement between the two vertebral bodies by means of wedges laterally.

It prepares a disc according to the invention, taking care to position the two strips so that they are both in their first position 15, 25, namely that shown in broken lines in FIG 3 and solid lines in Figure 4. in this configuration, given that the thickness Ep is less than the distance D (Figure 3), the two plates 10, 20 are in proximity to one another and the distance between their first faces 11, 21 is minimal. In this way, the disk can be easily inserted between the two vertebral bodies Cv1, Cv2.

Then, by means for example of the fork defined above, it encloses the two blades 13, 23 so that the two pins carried by the fork are plugged respectively into the notches 81, 82 made respectively in the two blades. He then subjecting this fork rotated by 90 ° so that the two first ends 17, 27 of the two blades respectively traverse the through breakthroughs 45, 46 made in the two plates 10, 20.

During this rotation, due to the structure of the disc defined hereinbefore, firstly the two plates move away from each other by a distance substantially equal to D - Ep, and secondly the first ends 17, 27 of the two blades are planted, by cutting, in the two vertebral bodies Cv1, Cv2. The two first faces 11, 21 of the two plates are then firmly against the opposite faces of two vertebral bodies, plus needed a distraction between vertebral bodies relieves the patient optimally.

When the intervertebral disc is located between two intervertebral bodies, that is to say in its configuration shown in Figure 3, the two plates 10, 20 may well be pivoted relative to each other about three axes the space defined above and the two vertebral bodies Cv1 and Cv2 relative to each other which regain their original relative mobility, essentially in that: β both blades 13, 23 are integral respectively these two vertebral bodies, which

• trays respectively based on both the bearing surfaces of revolution 51, 52 and on the vertebral body, thereby forming two plate-blade pairs (10-13) and (20-23) integral with, and • the two blades are pivotable by their second ends 18,

28 rotatably mounted by the spherical concave and convex surfaces respectively 41, 42.

In fact, the two vertebral bodies Cv1 and Cv2 are pivoted relative to each other by means of spherical surfaces concave and convex respectively 41, 42 of the second ends of the blades, via the plates 10, 20 and blades 13, 23 .

In the above description, it is evident that the disk according to the invention achieves all the goals defined in the preamble of this description.

Claims

1. Intervertebral disc adapted to be interposed between two consecutive first and second vertebral bodies (Cv1, Cv2) to replace a damaged intervertebral disc, comprising:
• a first plate (10) having a first face (11) adapted to engage the first vertebral body (Cv1) and a second face (12) opposite the first surface, • a first blade (13) mounted in cooperation with the first plate (10) so that said first blade is capable of assuming at least two first and second positions (15, 16), said first position (15) being one in which said first blade (13) is entirely contained in the first half-space delimited by the plane passing substantially through the first face (11) of the first plate (10) and contains said first plate (10), said second position (16) being one in which a first end (17) said first blade (13) emerges in the second half-space delimited by the plane passing substantially through the first face (11) of the first plate (10) and which does not contain said first plate, • a second plate (20) having a first side (21) apt e to engage the second vertebral body (Cv2) and a second face (22) opposite the first face,
• a second blade (23) mounted in cooperation with the second tray so that said second blade is capable of assuming at least two first and second positions (25, 26), said first position (25) being one in which said second blade (23) is entirely contained within the first half-space delimited by the plane passing substantially through the first face (21) of the second plate (20) and which contains the second plate, said second position (26) being one in which a first end (27) of said second blade (23) emerges in the second half-space delimited by the plane passing substantially through the first face (21) of the second plate (20) and which does not contain the second tray, and • means (30) mounted in cooperation with both said first and second trays (10, 20) for allowing both said plates to pivot relative to each other about three non-coincident axes, characterized in that means (30) mo nt in cooperation with the first and second trays (10 1 20) to allow these two said trays to pivot relative to each other are constituted by the fact that the first and second blades (13, 23) are mounted the rotating with respect to each other by their respective second ends (18, 28) opposite the first ends (17, 27), these two second ends being constructed as spherical surfaces and convex respectively concave (41, 42) substantially congruent and arranged one inside the other in pivoting, the two blades (13, 23) being rotatably mounted substantially in their plane, between the second faces (12, 22) of the two plates (10, 20) and passing respectively in the through passages (45, 46) formed respectively in both said plates, and that they comprise means (50) for mounting the two plates (10, 20) in cooperation respectively with the two blades (13, 23) for supporting both said pla cakes and move them away from each other when the two blades (13, 23) move from their first position (15-25) to their second positions (16-26).
2. Drive according to claim 1, characterized in that the means (50) for mounting the two plates (10, 20) in cooperation respectively with the two blades (13, 23) for supporting both said plates and away the one another when the two blades (13, 23) move from their first position (15-25) to their second positions (16-26) are constituted by two bearing surfaces (51, 52) integral respectively two blades (13, 23) and of revolution about an axis substantially perpendicular to the plane of rotation of the two blades, and two portions (53, 54) complementary to the two bearing surfaces (51, 52) formed respectively on the two second faces (12, 22) respectively of the two plates (10, 20), the two blades being mounted in cooperation with two plates so that the two bearing surfaces (51, 52) slide in rotation respectively on both Additional portions (53, 54) when the two blades pass from their first po sition (15-25) to their second position (16-26), and conversely, the overall thickness (Ep) of the bearing surfaces (51, 52) defined on a straight line perpendicular to the axis of rotation blades and the line passing through the first ends (17, 27) of the two blades when the latter are substantially aligned, being less than the overall distance (D) between the two bearing surfaces (51, 52) defined on substantially parallel to the straight line passing by the first ends (17, 27) of the two blades when the latter are substantially aligned.
3. Drive according to claim 2, characterized in that at least one of the plates being made of a material having a non-zero creep coefficient, said plate comprises reinforcement means (70) on at least the complementary part ( 53, 54) formed on its second side (12, 22).
4. Drive according to one of claims 1 to 3, characterized in that it comprises means (60) for limiting the rotation of the two blades (13, 23) relative to each other within limits determined.
5. Drive according to one of claims 1 to 4, characterized in that it comprises means (80) for simultaneously controlling the rotating passageway of said two blades, one of its two positions (15-25 ; 16-26) to the other.
6. Drive according to claim 5, characterized in that the means (80) for simultaneously controlling the rotating passage of the two said blades (13, 23), one of its two positions to the other, are formed by at least one of these three embodiments: at least one stud on each blade, at least one notch (81, 82) formed in each blade (13, 23), at least one notch in a blade and at least one lug on the other.
7. Drive according to Claim 6, characterized in that the said blades (13, 23) are configured to be able to cooperate with a fork with two teeth adapted to laterally clamp the two blades at their second end (18, 28), said fork comprising, basically defined between two teeth, a complementary embodiment thereof (81, 82) which is formed on said two blades (13, 23).
8. Drive according to one of the preceding claims, characterized in that it comprises means (90) for limiting the rotation and distancing of the two plates (10, 20) within defined limits.
PCT/FR2009/001153 2008-10-02 2009-09-29 Intervertebral disc WO2010037926A1 (en)

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FR0805446A FR2936703B1 (en) 2008-10-02 2008-10-02 intervertebral disc

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FR2936703B1 (en) 2011-11-18 grant

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