EP1610730A1 - Prothese articulaire intervertebrale pour la colonne cervicale - Google Patents

Prothese articulaire intervertebrale pour la colonne cervicale

Info

Publication number
EP1610730A1
EP1610730A1 EP04707931A EP04707931A EP1610730A1 EP 1610730 A1 EP1610730 A1 EP 1610730A1 EP 04707931 A EP04707931 A EP 04707931A EP 04707931 A EP04707931 A EP 04707931A EP 1610730 A1 EP1610730 A1 EP 1610730A1
Authority
EP
European Patent Office
Prior art keywords
prosthesis
central
area
zones
intervertebral space
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Withdrawn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
EP04707931A
Other languages
German (de)
English (en)
Inventor
Helmut D. Link
Arnold Keller
Paul C. Scoliosis and Spine Center MCAFEE
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.)
Cervitech Inc
Original Assignee
Cervitech Inc
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 Cervitech Inc filed Critical Cervitech Inc
Priority to EP04707931A priority Critical patent/EP1610730A1/fr
Publication of EP1610730A1 publication Critical patent/EP1610730A1/fr
Withdrawn legal-status Critical Current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
    • A61F2/442—Intervertebral or spinal discs, e.g. resilient
    • 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
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/16—Bone cutting, breaking or removal means other than saws, e.g. Osteoclasts; Drills or chisels for bones; Trepans
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/16—Bone cutting, breaking or removal means other than saws, e.g. Osteoclasts; Drills or chisels for bones; Trepans
    • A61B17/1662—Bone cutting, breaking or removal means other than saws, e.g. Osteoclasts; Drills or chisels for bones; Trepans for particular parts of the body
    • A61B17/1671—Bone cutting, breaking or removal means other than saws, e.g. Osteoclasts; Drills or chisels for bones; Trepans for particular parts of the body for the spine
    • 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
    • A61F2/442—Intervertebral or spinal discs, e.g. resilient
    • A61F2/4425—Intervertebral or spinal discs, e.g. resilient made of articulated components
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/16—Bone cutting, breaking or removal means other than saws, e.g. Osteoclasts; Drills or chisels for bones; Trepans
    • A61B17/1659—Surgical rasps, files, planes, or scrapers
    • 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
    • A61F2/30767—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth
    • 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
    • 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
    • A61F2002/30138—Convex polygonal shapes
    • A61F2002/30156—Convex polygonal shapes triangular
    • 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
    • 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
    • A61F2002/30383—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
    • 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
    • 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
    • A61F2002/30535—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
    • A61F2002/30578—Special structural features of bone or joint prostheses not otherwise provided for with extending fixation tabs having apertures, e.g. for receiving fixation screws
    • 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
    • A61F2/30767—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
    • A61F2002/30841—Sharp anchoring protrusions for impaction into the bone, e.g. sharp pins, spikes
    • 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
    • A61F2/30767—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
    • A61F2002/30878—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth applied in original prostheses, e.g. holes or grooves with non-sharp protrusions, for instance contacting the bone for anchoring, e.g. keels, pegs, pins, posts, shanks, stems, struts
    • A61F2002/30879—Ribs
    • 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
    • A61F2/30767—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
    • A61F2002/30878—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth applied in original prostheses, e.g. holes or grooves with non-sharp protrusions, for instance contacting the bone for anchoring, e.g. keels, pegs, pins, posts, shanks, stems, struts
    • A61F2002/30891—Plurality of protrusions
    • A61F2002/30892—Plurality of protrusions parallel
    • 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
    • A61F2/30767—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
    • A61F2002/30904—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth applied in original prostheses, e.g. holes or grooves serrated profile, i.e. saw-toothed
    • 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
    • A61F2/442—Intervertebral or spinal discs, e.g. resilient
    • A61F2/4425—Intervertebral or spinal discs, e.g. resilient made of articulated components
    • A61F2002/443—Intervertebral or spinal discs, e.g. resilient made of articulated components having two transversal endplates and at least one intermediate component
    • 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
    • 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
    • A61F2230/0023—Angular shapes triangular
    • 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
    • A61F2310/00—Prostheses classified in A61F2/28 or A61F2/30 - A61F2/44 being constructed from or coated with a particular material
    • A61F2310/00005—The prosthesis being constructed from a particular material
    • A61F2310/00011—Metals or alloys

Definitions

  • Joint prostheses for replacing an intervertebral disc of the cervical spine consist of two cover plates and a joint core.
  • the cover plates which are arranged approximately parallel to each other on both sides of the core, have 0 surfaces which are intended for connection to the end plates of the adjacent vertebral bodies.
  • Known prostheses of this type FR-A-2718635, EP-B-699426,. WO 03063727, WO 0211650, EP-A-1166725, EP-A-820740
  • FR-A-2718635, EP-B-699426, WO 03063727, WO 0211650, EP-A-1166725, EP-A-820740 are limited in a circle. Since the end plates of the vertebral bodies are much wider than they are deep in the AP direction, these known prostheses do not take advantage of the size of the naturally given surfaces for the force transmission.
  • cages are used to immobilize adjacent vertebral bodies for the purpose of their fusion. Since they aim at the vertebrae growing together, the quality of their own long-term connection to the bone is less important. The preservation of the natural bone substance also plays no role, since it is replaced by homologous material stored in the cage (EP-B-179695, WO 9720526, US 2001/0016774, WO 0191686, WO 9000037).
  • the invention seeks to further develop the type of prosthesis disclosed in its earlier applications mentioned (WO 03075804) with the aim of better power transmission between the prosthesis and the vertebral end plates, while largely maintaining the natural bone substance.
  • the invention is based on the knowledge that the vertebral end plates of the cervical spine are regionally a have different degrees of mineralization. The higher the mineralization, the denser the bone material and the more suitable it is for the absorption of force. It has been shown that the highest degree of mineralization is present in the lateral edge zones of the vertebral end plates, where the essentially flat central region of these end plates changes into a greater curvature in the frontal section, which leads to the uncovertebral joints.
  • the basic idea of the invention is to use these edge zones for the force transmission between the prosthesis and the bone.
  • the prosthesis surfaces intended for contact with the vertebral body surface are extended laterally into the more mineralized and at least partially more curved lateral edge zones of the vertebral body surface.
  • these edge zones of the vertebral end plates should be retained, even if the prosthesis height or the adaptation of the bone to the shape of the prosthesis requires a certain milling of the vertebral end plates.
  • this milling is essentially limited to the central region of the vertebral end plates, where the bone strength is in any case lower, while the firmer edge zones are wholly or partly preserved.
  • the shape of the prosthesis according to the invention makes this possible by the extent of its convex curvature. This curvature is chosen to be at least as large as the counter-curvature of the associated end plate surface. Generally it is larger.
  • the central areas of the prosthesis surface protrude further up or down with respect to the surface of the vertebral bodies than the edge zones.
  • the height of the prosthesis is limited in the peripheral zones in such a way that there is a milling of the bone is dispensable. Only the cartilage is removed and, if necessary, the bone surface is slightly refreshed for a better connection to the prosthesis. If milling is necessary at all, it can mainly be limited to the central area.
  • the shape relationships according to the invention can also be characterized in such a way that the surface of the prosthesis is complementarily similar to the shape of the vertebral end plates in the frontal section, but protrudes more strongly in the central area - based on the average shape of the end plates.
  • Another alternative characterization of the prosthesis shape means that the height of the prosthesis in the caudal-cranial direction in the lateral marginal areas is approximately equal to the height of an average intervertebral space, which is required as a norm, while it is larger in the central area.
  • the dimensions are chosen so that when used in an average shaped intervertebral space, there is little milling in the central area, but not in the edge zones of the front section under consideration. In some cases it is also not necessary to mill the central area.
  • the more mineralized edge zones of the vertebral end plates are inclined as a transition to the unovertebral joints in the frontal section.
  • the edge zones of the prosthesis surface, which are intended for installation there, also expediently have a corresponding inclination.
  • the angle of inclination with respect to the main direction of extension of the prosthesis is expediently 20 °.
  • this inclination is advantageously at least 0 ° and preferably 10 to 30 ° ' .
  • the width of the prostheses should be at least 1.5 times as large as their depth in the anteroposterior direction, which lies in the intervertebral space. This factor is preferably greater than 1.63.
  • 1 is a plan view of a cervical vertebra
  • 2 shows a frontal section through the vertebral body according to one of the dash-dotted lines in FIG. 3
  • FIG. 3 is a plan view of a vertebral body with indicated frontal planes
  • FIG. 4 shows the outline of a prosthesis within a frontal plane according to FIG. 3,
  • 22 and 23 are perspective views of a prosthesis from different directions.
  • the more mineralized areas have a higher load-bearing capacity and are also better supported by the underlying cancellous bone tissue, as indicated by dotted lines.
  • the lateral edge zones 4 merge into the flanks 5 with a continuously increasing inclination, without an anatomical boundary being clearly recognizable. Nevertheless, a limit is shown in FIG. 1 for better understanding. It is the line below which the lateral zones -4 lie, which are suitable for supporting the prosthesis according to the invention, while the flanks 5 above them are too steep, namely steeper than a limit value to be selected, which is in the Usually lies between an inclination of 20 and 40 °.
  • FIG. 4 shows a section along one of the frontal planes indicated by dash-dotted lines in FIG. 3.
  • the prosthesis is shown with solid lines, the end plates of the vertebral bodies are shown with dash-dotted lines.
  • a prerequisite is a prosthesis 7, the lower surface 9 of which has an approximately flat central region 8, which cooperates with the central region 2 of the upper end plate 12 of the lower vertebral body, and has bevelled zones 10 to the sides, which correspond to the lateral edge zones 4 of the lower Interacts with the vertebral body.
  • the prosthesis shape corresponds approximately to the shape of the upper end plate in the section shown of the lower vertebral body, so that no or only slight millings on the vertebral body are necessary to adapt the prosthesis. It is desirable that in the edge zones 4 of the end plate only the cartilage resting on the bone substance is removed, while the bone substance itself remains unaffected or is only slightly refreshed in order to adapt sufficiently to the shape of the prosthesis and to connect better with it.
  • the surface of the prosthesis is equipped in its central area 8 in such a way that an intimate and permanently firm connection with the bone results.
  • it can be provided with elevations and depressions (see the teeth in FIGS. 21, 22) and a coating which activates the bone growth.
  • FIGS. 5 to 7 show in frontal section a uniformly rounded prosthesis lower surface, which requires almost no bone milling in the edge zones 4, while the central region 2 is milled deeper. Instead of the deeper milling of the central area, provision can also be made for the surface of the prosthesis in the central area 8 to be designed so that it plastically sinks into the remaining bone substance without bone milling or after slight bone milling.
  • the prosthesis shapes that are in Fig. 6 reversed roof-shaped and in Fig. 7 centrally flat and rising in edge zones 10 (similar to the embodiment of FIG. 4) are shown.
  • the lateral edge zones 4 of the associated vertebral body end plate 13 can largely be obtained, while a slight milling is required in the central region.
  • the lateral edge zones 4 of the vertebral body end plate can therefore effectively participate in the power transmission.
  • a substantial part of the power transmission also takes place in the central area.
  • this area also serves for long-term anchoring of the prosthesis in the intervertebral space.
  • FIGS. 8 and 9 show, in frontal section, dome-shaped prosthesis surfaces 8 of different degrees of curvature. It is assumed that the associated end plate 13 is a little concave, ie complementary, in the frontal section. In contrast to this, FIG. 10 presupposes a weakly convex end plate 13 and shows that in this case too it is possible to largely preserve the lateral edge zones of the end plate 13 and the milling of the bone is limited to the central region.
  • FIG. 11 shows an example in which the upper side of the prosthesis in the edge zones 14 is almost flat in order to be able to better fit against the edge zones 4 of the bone, while the central region 15 is conical or roof-shaped. This ensures that the prosthesis is safely located on the bone.
  • the entire upper side of the prosthesis is roof-shaped or conical. This also protects the lateral
  • FIG. 13 shows an upper side of the prosthesis that is flat in the central region 16 and beveled in the lateral edge regions 17. This shape is particularly advantageous because not only in the lateral
  • the upper and lower sides of the prosthesis are convex.
  • the prosthesis has a greater height in the central area than in its peripheral areas. This is favorable for accommodating a lenticular prosthesis core (see for example WO03 / 075804).
  • the prosthesis core in the peripheral zone ' n requires a lower height. In this way, the overall height of the prosthesis can be kept low. In particular, it can be kept so low that routing in the lateral edge zones of the vertebral end plates can generally be avoided.
  • edge zones 10 of the lower surface of the prosthesis can cooperate with the edge zones 4 of the end plate surface, they should be inclined approximately like this.
  • This inclination ⁇ (FIG. 5) is determined with respect to the main plane 14 of the prosthesis or the intervertebral space and should be at least 20 ° for the lower surface of the prosthesis. It is preferably of the order of 30 ° or above. The further the prosthesis extends laterally into the marginal zone of a higher degree of mineralization, the greater the angle of inclination it must reach.
  • the corresponding angle ⁇ (FIG. 10) at the top of the prosthesis can be flatter because the prosthesis is not constricted there by the rising flank of the uncovertebral joint. It can go down to 0 ° and preferably reaches 10 to 30 °.
  • the end plate surface 17 has a height indicated by the arrow 18 in its central region 2 and an average height according to arrow 19 in its lateral edge zone 4.
  • the difference 23 between the heights 21 and 22 of the prosthesis should be at least as large as the difference 24 between the heights 18 and 19 of the end plate surface. If this condition is met, the goal can be achieved that the lateral edge zones 4 of the end plate need only be subjected to less material removal compared to their central area. This also applies accordingly to the top of the prosthesis.
  • the prosthesis can have any shape in the sagittal section.
  • their upper and lower surfaces can be essentially straight or arched in a central sagittal section.
  • a set of rasps is provided to give the bone surfaces exactly the shape they need to practice the invention. They are shown in FIGS. 15 to 21. They are designed to prepare the surface shape of the vertebrae for receiving the prosthesis. The examples shown are matched to the exemplary embodiment of the prosthesis, which is shown in FIGS. 22 and 23. It has a rectangular outline with rounded corners, which is suitable for making extensive use of the extent of the intervertebral space, including the lateral marginal zones. It is so flat that it can be used without deep milling of the vertebral end plates. It turns the vertebral bodies towards outer surfaces, the majority of which are roughly flat and toothed. Your dorsolateral corners 51 are chamfered so that in 3, frontal sections shown in FIG. 3 show approximately the outline shape of the prosthesis shown in FIGS. 7 and 13.
  • the outline shape is prepared by the set of rasps 52, 53 and 54 in the vertebral space shown in Figs. 15 to 20.
  • the graded size relationships of the rasps are shown in FIG. 21.
  • the smallest rasp 52 is inserted into the Intervertebral space pushed in to open access. Their depth of penetration is limited by the stop 56. Accordingly, it does not reach deeper into the intervertebral space than FIG. 21 shows.
  • rasp 53 which has a trapezoidal shape, approximately corresponding to the trapezoidal shape of the flat surface portion 50 of the prosthesis surface.
  • rasp 54 shapes the intervertebral space substantially in accordance with the shape of the prosthesis to be inserted.
  • the height of the rasps is the same as that of the prosthesis.
  • the rasps are toothless in those areas which correspond to the flat portion 50 of the prosthesis. This means that they only carry out slight abrasion with their leading edge 55. If, on the other hand, the prosthesis is designed in such a way that it requires more milling of the vertebral bodies in the central region, teeth can also be provided in these surfaces of the rasp. In the areas 57 of the rasp 54, which are assigned to the dorsolateral areas of the edge zones of the vertebral end plates, there is a toothing around which free the areas of the lateral marginal zones of cartilage and adjust them to the shape of the prosthesis if necessary.
  • the tips of the prosthesis sink into the comparatively compliant surface of the bone until the beveled edge zones 51 of the prosthesis on the lateral edge zones 4 of the vertebral end plates rest.

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  • Health & Medical Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Biomedical Technology (AREA)
  • Orthopedic Medicine & Surgery (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Neurology (AREA)
  • Animal Behavior & Ethology (AREA)
  • Oral & Maxillofacial Surgery (AREA)
  • Veterinary Medicine (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Public Health (AREA)
  • General Health & Medical Sciences (AREA)
  • Surgery (AREA)
  • Cardiology (AREA)
  • Transplantation (AREA)
  • Vascular Medicine (AREA)
  • Molecular Biology (AREA)
  • Medical Informatics (AREA)
  • Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
  • Dentistry (AREA)
  • Prostheses (AREA)

Abstract

L'invention concerne une prothèse articulaire intervertébrale pour un espace intervertébral de la colonne cervicale, délimité par les plaques terminales (12, 13) des corps vertébraux adjacents, dont les surfaces présentent des zones extérieures latérales (4) fortement courbées adjacentes à une zone centrale sensiblement plane (2) dans un plan frontal. Ces zones extérieures sont plus fortement minéralisées que la zone centrale et, par conséquent, particulièrement stables. Au moins une des surfaces (10, 11) de la prothèse qui sont prévues pour reposer contre une surface d'un corps vertébral présente une extension latérale dans les zones extérieures (4). La courbure convexe de cette surface de prothèse (9, 11) est, dans le plan frontal, au moins aussi grande que la courbure correspondante de la surface des plaques terminales (12, 13). Selon ladite invention, cette prothèse s'appuie également contre ces zones extérieures particulièrement stables et ces dernières ne nécessitent aucun enlèvement de matière significatif.
EP04707931A 2003-04-07 2004-02-04 Prothese articulaire intervertebrale pour la colonne cervicale Withdrawn EP1610730A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP04707931A EP1610730A1 (fr) 2003-04-07 2004-02-04 Prothese articulaire intervertebrale pour la colonne cervicale

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP03008127 2003-04-07
EP04707931A EP1610730A1 (fr) 2003-04-07 2004-02-04 Prothese articulaire intervertebrale pour la colonne cervicale
PCT/EP2004/001029 WO2004089258A1 (fr) 2003-04-07 2004-02-04 Prothese articulaire intervertebrale pour la colonne cervicale

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EP1610730A1 true EP1610730A1 (fr) 2006-01-04

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EP04707931A Withdrawn EP1610730A1 (fr) 2003-04-07 2004-02-04 Prothese articulaire intervertebrale pour la colonne cervicale
EP04711582A Withdrawn EP1610731A1 (fr) 2003-04-07 2004-02-17 Prothese articulaire de disque intervertebral cervical

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US (1) US20060195189A1 (fr)
EP (2) EP1610730A1 (fr)
JP (2) JP2006521845A (fr)
KR (2) KR100754570B1 (fr)
CN (2) CN1802133A (fr)
AR (2) AR048119A1 (fr)
AU (2) AU2004228904A1 (fr)
BR (1) BRPI0409091A (fr)
CA (2) CA2519925A1 (fr)
IL (1) IL170969A (fr)
MX (2) MXPA05010766A (fr)
NZ (1) NZ542551A (fr)
PL (2) PL378751A1 (fr)
RU (2) RU2325875C2 (fr)
WO (2) WO2004089258A1 (fr)
ZA (2) ZA200508010B (fr)

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US20060195189A1 (en) 2006-08-31
RU2325875C2 (ru) 2008-06-10
CA2519926A1 (fr) 2004-10-21
MXPA05010768A (es) 2006-05-25
NZ542551A (en) 2010-04-30
KR100754570B1 (ko) 2007-09-05
AU2004228908A1 (en) 2004-10-21
ZA200508010B (en) 2006-07-26
JP2006521848A (ja) 2006-09-28
IL170969A (en) 2010-12-30
PL378752A1 (pl) 2006-05-15
JP2006521845A (ja) 2006-09-28
BRPI0409091A (pt) 2006-04-11
AU2004228904A1 (en) 2004-10-21
PL378751A1 (pl) 2006-05-15
RU2005134220A (ru) 2006-03-10
WO2004089258A1 (fr) 2004-10-21
CN100594855C (zh) 2010-03-24
CN1771013A (zh) 2006-05-10
WO2004089259A1 (fr) 2004-10-21
AU2004228908A2 (en) 2004-10-21
RU2005134216A (ru) 2006-06-10
CN1802133A (zh) 2006-07-12
AU2004228908B2 (en) 2010-01-21
KR20060005358A (ko) 2006-01-17
AR048120A1 (es) 2006-04-05
CA2519925A1 (fr) 2004-10-21
AR048119A1 (es) 2006-04-05
EP1610731A1 (fr) 2006-01-04
RU2307624C2 (ru) 2007-10-10
JP4617294B2 (ja) 2011-01-19
KR101134264B1 (ko) 2012-04-12
MXPA05010766A (es) 2005-12-12
KR20060005357A (ko) 2006-01-17
ZA200508062B (en) 2007-03-28

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