EP1890655A1 - Zwischen zwei aufeinanderfolgende wirbel einsetzbare vorrichtung - Google Patents

Zwischen zwei aufeinanderfolgende wirbel einsetzbare vorrichtung

Info

Publication number
EP1890655A1
EP1890655A1 EP06764776A EP06764776A EP1890655A1 EP 1890655 A1 EP1890655 A1 EP 1890655A1 EP 06764776 A EP06764776 A EP 06764776A EP 06764776 A EP06764776 A EP 06764776A EP 1890655 A1 EP1890655 A1 EP 1890655A1
Authority
EP
European Patent Office
Prior art keywords
plate
main
inter
main plate
given axis
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP06764776A
Other languages
English (en)
French (fr)
Inventor
Hassan Razian
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Publication of EP1890655A1 publication Critical patent/EP1890655A1/de
Withdrawn legal-status Critical Current

Links

Classifications

    • 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
    • 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
    • A61F2/447—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 substantially parallelepipedal, e.g. having a rectangular or trapezoidal cross-section
    • 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
    • A61F2/442—Intervertebral or spinal discs, e.g. resilient
    • 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
    • A61F2/28—Bones
    • A61F2002/2835—Bone graft implants for filling a bony defect or an endoprosthesis cavity, e.g. by synthetic material or biological material
    • 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
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    • A61F2002/30108—Shapes
    • A61F2002/3011—Cross-sections or two-dimensional shapes
    • A61F2002/30138—Convex polygonal shapes
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    • A61F2002/30329—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
    • A61F2002/30383—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements made by laterally inserting a protrusion, e.g. a rib into a complementarily-shaped groove
    • A61F2002/3039—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements made by laterally inserting a protrusion, e.g. a rib into a complementarily-shaped groove with possibility of relative movement of the rib within the groove
    • A61F2002/30398—Sliding
    • A61F2002/304—Sliding with additional means for limiting said sliding
    • 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
    • A61F2002/30001—Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
    • A61F2002/30316—The 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
    • A61F2002/30329—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
    • A61F2002/30405—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements made by screwing complementary threads machined on the parts themselves
    • 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
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    • A61F2002/30316—The 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
    • A61F2002/30329—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
    • A61F2002/30451—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements soldered or brazed or welded
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
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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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    • 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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    • 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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    • A61F2002/30535—Special structural features of bone or joint prostheses not otherwise provided for
    • A61F2002/30537—Special structural features of bone or joint prostheses not otherwise provided for adjustable
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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
    • A61F2/30767—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth
    • A61F2/30771—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth applied in original prostheses, e.g. holes or grooves
    • A61F2002/30772—Apertures or holes, e.g. of circular cross section
    • A61F2002/30774—Apertures or holes, e.g. of circular cross section internally-threaded
    • 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
    • A61F2/3094—Designing or manufacturing processes
    • A61F2/30942—Designing or manufacturing processes for designing or making customized prostheses, e.g. using templates, CT or NMR scans, finite-element analysis or CAD-CAM techniques
    • A61F2002/30957—Designing or manufacturing processes for designing or making customized prostheses, e.g. using templates, CT or NMR scans, finite-element analysis or CAD-CAM techniques using a positive or a negative model, e.g. moulds
    • 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
    • A61F2/46—Special tools for implanting artificial joints
    • A61F2/4637—Special tools for implanting artificial joints for connecting or disconnecting two parts of a prosthesis
    • A61F2002/4638—Tools for performing screwing, e.g. nut or screwdrivers, or particular adaptations therefor
    • 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
    • A61F2220/00—Fixations or connections for prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
    • A61F2220/0025—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
    • 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
    • A61F2220/00—Fixations or connections for prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
    • A61F2220/0025—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
    • A61F2220/0058—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements soldered or brazed or welded
    • 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
    • A61F2230/00—Geometry of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
    • A61F2230/0002—Two-dimensional shapes, e.g. cross-sections
    • A61F2230/0017—Angular shapes
    • A61F2230/0019—Angular shapes rectangular
    • 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
    • A61F2230/00—Geometry of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
    • A61F2230/0063—Three-dimensional shapes
    • A61F2230/0065—Three-dimensional shapes toroidal, e.g. ring-shaped, doughnut-shaped
    • 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
    • A61F2230/00—Geometry of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
    • A61F2230/0063—Three-dimensional shapes
    • A61F2230/0082—Three-dimensional shapes parallelepipedal
    • 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
    • A61F2250/00—Special features of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
    • A61F2250/0004—Special features of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof adjustable
    • A61F2250/0008—Special 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 a position by translation along an axis or two perpendicular axes
    • 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
    • A61F2250/00—Special features of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
    • A61F2250/0058—Additional features; Implant or prostheses properties not otherwise provided for
    • A61F2250/006—Additional features; Implant or prostheses properties not otherwise provided for modular
    • A61F2250/0063—Nested prosthetic parts

Definitions

  • the present invention relates to devices capable of being inserted between two consecutive vertebrae, which find a particularly advantageous application both as an intervertebral cage and as replacement prosthesis of an intervertebral disc.
  • the Practitioner can choose to join the two consecutive vertebrae together by osteosynthesis.
  • the intervertebral disk is partially or completely destroyed and replaced by an intervertebral cage generally associated with an osteosynthesis promoting element, for example a bone graft.
  • the cage according to this document essentially comprises two rigid plates pivotally mounted relative to one another on hinge means and on means for pivoting said two plates so that their ends farthest from the hinge means move away from each other.
  • This cage the majority of the distraction forces between the two consecutive vertebrae between which is interposed the cage is applied to the free ends of the two plates. These forces are therefore distributed over a small surface of the vertebral bodies.
  • the object of the present invention is to provide a device capable of being inserted between two consecutive vertebrae which, although of very simple structure and involving an easy implantation technique, can be used both as an intervertebral cage and as replacement prosthesis of an intervertebral disk, which overcomes the disadvantages mentioned above cages of the prior art.
  • the present invention relates to a device adapted to be inserted between two consecutive vertebrae, characterized in that it comprises: • two main plates substantially parallel to each other and arranged in two planes substantially perpendicular to a given axis to delimit an inter-plate space,
  • FIGS. 1 and 2 show a first embodiment of the device according to the invention adapted to be inserted between two consecutive vertebrae, FIG. 1 being a perspective view in a cavalier view, FIG. 2 a side view,
  • FIG. 3 represents, in side view, a second embodiment of the device according to the invention
  • FIGS. 4 and 5 show a third embodiment of the device according to the invention, FIG. 4 being a view from above and FIG.
  • FIG. 6 represents a view from above of a fourth embodiment of the device according to the invention.
  • the device according to the invention adapted to be inserted between two consecutive vertebrae comprises two main plates 1, 2 substantially parallel to each other and arranged in two planes substantially perpendicular to a given axis 3 to delimit a interplate space 4, elastic body means 5 interposed between the two main plates in this inter-plate space, these elastic body means being able to expand along at least one direction perpendicular to the given axis 3 when a force pair compression is applied thereto along this axis, and means 10 for controlling the displacement of the two main plates 1, 2 parallel to themselves along the given axis 3.
  • the elastic body means 5 are relaxed and their volume is entirely, or almost, contained in the inter-plate space 4. However, even in the rest configuration, they will advantageously be slightly compressed to exert a torque of forces respectively on the two main plates 1, 2 and thus obtain good cohesion between the constituent elements of the device.
  • the means 10 for controlling the displacement of the two main plates 1, 2 parallel to themselves along the given axis 3 they are advantageously constituted by a threaded rod 11, means 12 for mounting one end 13 of the rod threaded in free rotation directly or indirectly on a first 1 of the two main plates 1, 2, and a threaded orifice 15 made in an element 17 connected to the second main plate 2, the threaded rod being mounted screwed into this threaded orifice 15 .
  • this rod may comprise two successive threads, a first thread for, at first, to obtain a fast advance of the rod 11 relative to the second plate 2, and a second for a slower advance, for example to proceed as finely as possible to the final adjustment of the distance separating the two main plates 1, 2 and therefore the swelling of the elastic body means 5 as will be explained below.
  • the end 13 of the threaded rod 11 is mounted in free rotation in the first main plate 1 in a direct manner, for example by a through-hole 16, being supported in 19 by a screw head or the like.
  • the shoulder 19 is, in this embodiment, located on the face of the first main plate 1 which is outside the inter-plate space 4.
  • the means 12 defined above are constituted by a first auxiliary plate 20 arranged substantially parallel to the two main plates 1, 2 and on the same given axis 3, and by holding means 21 of this first auxiliary plate 20 relative to the first main plate 1 outside the inter-plate space 4 and facing the outer face of the second main plate 2 not located in the inter-plate space.
  • the means 21 for holding the first auxiliary plate 20 outside the inter-plate space 4 consist of at least one tab 22, 25 and means for securing the two ends 23, 24 of the tab 22 together. , Respectively on an edge of the first auxiliary plate 20 and an edge of the first main plate 1, so that the tab 22, 25 is situated outside the inter-plate space 4.
  • the assembly formed of the first plate 1, the lug 22, 25 and the first auxiliary plate 20 is made in one piece, by forming, bending, welding, molding or other techniques.
  • the width of the tab 22, 25 taken in the direction perpendicular to the given axis 3 is at most equal, if not equal, to the height of the inter-plate space 4 taken along the same direction .
  • the device further comprises means 30 for guiding the second main plate 2 in a displacement advantageously of translation and indexing its displacement with respect to the tab 22, 25.
  • these means 30 are constituted, FIG. 4, by a longitudinal groove 31 made in the lug 22, 25 along the given axis 3 and a lug 32 secured to the second main plate 2 so as to plunge into the groove 31 and go through it when the second main plate 2 moves relative to the first main plate 1 along the given axis 3.
  • the length of the groove is determined to limit the displacement of the second main plate.
  • the threaded rod is mounted screwed into the second main plate 2, and in free rotation in the first auxiliary plate 20 by a through hole 18 made in this auxiliary plate 20, being supported at 39 by a head of screw or the like.
  • the shoulder 39 is located in contact with the face of the auxiliary plate which is opposite the outer face of the second main plate 2.
  • the element 17 connected to the second main plate 2 and in which is made the threaded orifice 15 is constituted by a second auxiliary plate 60 disposed substantially parallel to the two main plates 1, 2 and on the same axis given 3, and by holding means 61 of the second auxiliary plate 60 relative to the second main plate 2, outside the inter-plate space 4 and facing the face exterior of the first main plate 1 not located in the interplate space 4.
  • these means 61 for maintaining the second auxiliary plate 60 outside the inter-plate space 4 consist of at least one lug 64, 65 and means for securing the two ends of the lug 64, 65 respectively on an edge of the second auxiliary plate 60 and an edge of the second main plate 2, so that the tab 64, 65 is located outside the inter-plate space 4.
  • the means 12 for mounting the end 13 of the freely rotating threaded rod on the first main plate 1 comprise ball or similar means 62 allowing the first main plate 1 to pivot according to a axis of rotation 63 perpendicular to the given axis 3, at a given angle ⁇ , FIG. 6.
  • this axis 63 will be perpendicular to the faces of the vertebral bodies of the two vertebrae.
  • the device according to this embodiment illustrated in FIG. 6 comprises means, not illustrated in this FIG. 6, for guiding the first main plate 1 in a displacement advantageously of translation. and indexing its displacement relative to the tab 64, 65.
  • These elastic body means 5 may be constituted in different ways, depending on the possible applications of the device. They are for example constituted, FIGS. 1, 2, 4, 5 and 6, by at least one leaf spring 40, the two ends of which are respectively integral with the two main plates 1, 2, this leaf spring advantageously being prestressed in bending of so that its convex face 41 is turned towards the outside of the inter-plate space 4.
  • a blade can be of any shape, for example in the form of a lamella as illustrated, or hemispherical or the like.
  • these elastic body means 5 consist of at least two pairs of leaf springs 40 located on either side of the inter-plate space 4 so that the convex faces 41 of the blades come into contact with the vertebral bodies of the two vertebrae, and whose ends are two by two respectively integral with the two main plates 1, 2 .
  • these elastic body means 5 can also be constituted, as illustrated in FIG. 3, by a plurality of rings 50 made of elastic material mounted or stacked against one another in the inter-plate space 4 and substantially centered on the given axis 3.
  • the device may also comprise means for promoting anchoring, for example lamellae, in the bone body of the vertebrae.
  • These means may consist of lugs, pins and / or undulations on the convex face of the lamellae. These means are well known in themselves and have not been represented.
  • the device may further comprise means for defining a minimum distance between the two main plates 1, 2.
  • These means can be of any type but, advantageously, as shown schematically in Figure 2, they may be constituted by a body 51 in the form of olive or the like which is slidably mounted on the rod portion 11 between the two main plates.
  • the device according to the invention can be used, either as an intervertebral cage between two consecutive vertebrae, or as replacement prosthesis of the intervertebral disc located between these two vertebrae.
  • the Practitioner wants to use the device as a replacement prosthesis for a damaged intervertebral disc, he places it between the two vertebrae in the same way as a prosthesis of the prior art and, by varying the tension of the elastic body means 5, like the leaf springs 40 which will emerge more or less from the inter-plate space 4, it can adjust the distance between the vertebral bodies of the two vertebrae and allow these two vertebrae to move relative to each other. other in movements substantially identical to their original movements, when separated by the undamaged disk.
  • the Practitioner wants to use the device as an intervertebral cage, he places it between the two vertebrae in the same way as a prior art intervertebral cage and, by adjusting the inter-plate distance, he varies the transverse expansion of the elastic body 5 and therefore the distance between the two vertebral bodies, until the desired distance to their joining by osteosynthesis.
  • the practitioner stiffens the cage to avoid, in particular, excessive flexing of the elastic body means and advantageously places, in the inter-plate space 4, for example a bone graft to promote the osteosynthesis between the two vertebrae.
  • a same device according to the invention can be used, initially as replacement prosthesis of an intervertebral disc, and in a second time as inter somatic cage after having been stiffened at least partially and after the introduction of a bone graft.
  • FIG. 6 which comprises ball-and-socket means 62 for linking the end 13 of the threaded rod 11 with the first main plate 1, has a further advantage over the embodiments according to the other FIGS. at 5.
  • the ball-and-socket means 62 allow a rotation of the first main plate 1 around the axis 63 defined above, which induces a decompression of the two blades situated on the pinch side and a compensating compression. on the side of the opening.
  • the first main plate 1 takes the position Ph. If the pinching occurs on the B side, the plate 1 takes the Pb position, the two positions Ph and Pb being illustrated in broken lines in this figure 6.

Landscapes

  • Health & Medical Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Biomedical Technology (AREA)
  • Neurology (AREA)
  • Orthopedic Medicine & Surgery (AREA)
  • Cardiology (AREA)
  • Oral & Maxillofacial Surgery (AREA)
  • Transplantation (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Vascular Medicine (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Prostheses (AREA)
EP06764776A 2005-06-15 2006-06-13 Zwischen zwei aufeinanderfolgende wirbel einsetzbare vorrichtung Withdrawn EP1890655A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0506103A FR2887138B1 (fr) 2005-06-15 2005-06-15 Dispositif apte a etre intercale entre deux vertebres consecutives
PCT/FR2006/001327 WO2006134262A1 (fr) 2005-06-15 2006-06-13 Dispositif apte a etre intercale entre deux vertebres consecutives

Publications (1)

Publication Number Publication Date
EP1890655A1 true EP1890655A1 (de) 2008-02-27

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EP (1) EP1890655A1 (de)
FR (1) FR2887138B1 (de)
WO (1) WO2006134262A1 (de)

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Also Published As

Publication number Publication date
WO2006134262A1 (fr) 2006-12-21
FR2887138B1 (fr) 2007-08-10
FR2887138A1 (fr) 2006-12-22

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