EP1482876A1 - Prothese intervertebrale cervicale - Google Patents

Prothese intervertebrale cervicale

Info

Publication number
EP1482876A1
EP1482876A1 EP03704673A EP03704673A EP1482876A1 EP 1482876 A1 EP1482876 A1 EP 1482876A1 EP 03704673 A EP03704673 A EP 03704673A EP 03704673 A EP03704673 A EP 03704673A EP 1482876 A1 EP1482876 A1 EP 1482876A1
Authority
EP
European Patent Office
Prior art keywords
intervertebral prosthesis
prosthesis according
teeth
ventral
cover plate
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Withdrawn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
EP03704673A
Other languages
German (de)
English (en)
Inventor
Erfindernennung liegt noch nicht vor Die
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 EP03704673A priority Critical patent/EP1482876A1/fr
Publication of EP1482876A1 publication Critical patent/EP1482876A1/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Withdrawn legal-status Critical Current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
    • 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
    • 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
    • A61F2002/30316—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
    • A61F2002/30329—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
    • A61F2002/30476—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements locked by an additional locking mechanism
    • 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
    • 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
    • A61F2002/30001—Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
    • A61F2002/30621—Features concerning the anatomical functioning or articulation of the prosthetic joint
    • A61F2002/30649—Ball-and-socket joints
    • 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
    • A61F2002/30621—Features concerning the anatomical functioning or articulation of the prosthetic joint
    • A61F2002/30649—Ball-and-socket joints
    • A61F2002/3065—Details of the ball-shaped head
    • 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
    • A61F2002/3082—Grooves
    • 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
    • A61F2002/30845—Sharp anchoring protrusions for impaction into the bone, e.g. sharp pins, spikes with cutting edges
    • 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
    • A61F2002/30904—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
    • 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
    • A61F2310/00017—Iron- or Fe-based alloys, e.g. stainless steel

Definitions

  • the solution according to the invention consists in the features of the claims.
  • the basic idea is that two counteracting fixation means are used, namely on the one hand a sawtooth interacting with the bone, by means of which a ventrally directed relative movement of the prosthesis is prevented and a dorsally directed relative movement is promoted, while on the other hand a stop the dorsally directed relative movement definitely limited.
  • At least one of the two cover plates belonging to the prosthesis is provided with teeth on its surface interacting with the associated vertebral body, and comprises at least one tooth with a steep flank turned towards the ventral and a less steep flank turned towards the dorsal.
  • This is commonly referred to as a sawtooth shape.
  • These saw teeth have the effect that, in the event of a relative movement between the cover plate and the associated vertebral body, a force is exerted thereon which tends to push it towards the dorsal.
  • the saw teeth thus provide protection against unwanted displacement of the cover plate and the prosthesis in an anterior direction.
  • a plurality of such teeth is preferably provided in the teeth.
  • the teeth expediently run in a rib-like manner transverse to the sagittal direction.
  • the toothing should be essentially nationwide. At least it should cover about half of the available area facing the vertebral body.
  • the Teeth must be so high that they can have a sufficient effect. On the other hand, they should be as low as possible in order to take up little vertical space. It has proven to be advantageous if they have a height between 0.2 and 0.6 mm and their distance in the sagittal direction is between 0.5 and 2 mm.
  • the force exerted dorsally by the teeth on the cover plate is only effective when there is a relative movement between the cover plate and the associated vertebral body. Such a relative movement is undesirable, since it is understandable that in the normal case, absolute rest is expected between the cover plate and the associated vertebra.
  • the teeth which can be regarded as macroscopic roughness, normally help to maintain the state of rest between the cover plate and the associated vertebral body. This can be further promoted by a coating of the prosthesis surface which favors the intimate connection of bone and prosthesis surface, for example with a microporous and / or bioactive material which promotes bone growth.
  • the force which is exerted on the cover plate in the event of a relative movement from the toothing to the dorsal side is neutralized by a stop surface which is provided on the ventral edge of the cover plate in order to cooperate with the ventral edge of the associated vertebral body.
  • This stop surface has the effect that. the cover plate and thus also the prosthesis can be conveyed as far dorsally as possible by the force of the force, the force of the saw, the height. until the stop surface of the cover plate lies against the ventral edge of the vertebral body.
  • the dimensions are chosen so that the system the stop surface on the ventral edge of the vertebral body has exactly reached the desired position of the prosthesis.
  • the stop surface is expediently formed by a flange which is arranged symmetrically on the ventral edge of the cover plate over a width which is expediently at least as large as half the medio-lateral dimension of the cover plate. It is thereby achieved that a parallel contact of the flange on the ventral edge of the vertebral body is always achieved and an oblique position of the desired sagittal axis of the prosthesis relative to the sagittal direction of the vertebral body is excluded.
  • the flange can be provided with openings for receiving fastening elements, for example bone screws. However, this is usually not necessary.
  • An embodiment without such screw holes, in which the flange has a low height so that it can only perform its stop function, is even particularly advantageous. It gives the possibility of working a recess into the vertebral body, which receives the flange. It is thereby achieved that the prosthesis can be displaced so far dorsally in relation to the ventral escape area of the adjacent vertebral bodies that it cannot cause irritation of the esophagus or any nerves or vessels running there.
  • the prosthesis can even remain completely behind this escape area and, seen from the ventral side, can thus be completely sunk in the area of the vertebral bodies. Furthermore, the waiver of the -'- Sch -au-benl-öc-he-r the advantage 7 -dß of the -Fla-ns-eh -mi-t -so - low height can be equipped, that the implant becomes very small and can be implanted through a narrow access channel, for example an endoscope. If the saw teeth are designed as ribs running transversely to the sagittal direction, there is the possibility that the cover plate is displaced relative to the associated vertebral body in the direction of these ribs.
  • ribs running transversely to the direction of the toothed ribs.
  • the grooves allow ingrowth of bone material and thereby prevent unwanted transverse movement.
  • Any ribs are expediently designed to be self-tapping so that they penetrate into the surface of the vertebral body when the prosthesis is inserted.
  • the stop surface does not necessarily have to be formed by a flange. In some cases, projections directed transversely to the plane of the cover plates are also sufficient. These should be arranged symmetrically in pairs in order to allow the prosthesis to be aligned with the direction of the vertebral bodies.
  • the design of the stop surface on a pair of symmetrically arranged, spaced apart projections has the advantage that the ventral central region of the vertebral bodies, where mainly the proximity to the esophagus is to be expected, is free of prosthesis parts.
  • ventral edges and edges of the prosthesis should be well rounded in order to keep their potential for possible irritation of neighboring organs low.
  • Fig. 1 is a plan view of the upper end plate of a prosthesis in approximately natural size
  • FIG. 2 shows the same on a larger scale; and FIG. 3 shows a sagittal section on the scale corresponding to FIG. 2.
  • the prosthesis consists of a lower cover plate 1 made of hard, resistant material, in particular metal, a prosthesis core 2 consisting of polyethylene or other low-friction plastic and an upper cover plate 3, which can consist of the same material as the lower cover plate 1.
  • the prosthesis core 2 is fixedly, if detachably, connected to the lower cover plate 1.
  • the connection is effected by undercut edge strips 4 on the dorsal side and both lateral sides of the lower cover plate 1, into which the prosthesis core 2 provided with complementary grooves can be inserted. In the inserted position, it is secured by a bolt 5.
  • the prosthesis core 2 and the upper cover plate 3 form interacting, complementary, preferably spherical sliding surfaces 6.
  • the respective surfaces of the cover plates 1 and 3 facing the associated vertebral body 7 are designed to match. Most of its surface is covered by a plurality of teeth 9, which are sawtooth-shaped, namely with a steep flank 10, which is directed to the ventral side and a less steep flank 11, which faces the dorsal --- side -de-t ist-: -The s-te-i-le -Fla-nke- -is-fe v- ⁇ -rz-ug-wweise- approximately perpendicular to the plane of extension of the cover plates.
  • the teeth 9 have the shape of ribs running transversely to the sagittal central axis 8, which are interrupted in the middle to form a groove 12. The teeth 9 are missing in the area of the groove 12.
  • the groove base surface 13 corresponds to the tooth base surface and is indicated by dashed lines in FIG. 3.
  • the groove can also be deeper or flatter. Instead of a centrally arranged groove, it is also possible to provide a plurality of grooves, which may be narrower, distributed over the surface. A symmetrical arrangement is appropriate.
  • this effect can also be produced by one or more ribs which are arranged transversely to the course of the ribs forming the teeth 9. These ribs should be narrow and sharp, so that they easily penetrate the bone material when the prosthesis is inserted and do not impair the immediate formation of a tight fit of the cover plate surface on the respectively assigned bone surface.
  • the surface of the prosthesis can be provided with a coating 14, in which the bone material grows in its pores and / or which biologically favors the ingrowth of bone substance.
  • the cover plates 1, 3 are provided with a bar-shaped projection 15 which projects cranially or caudally beyond the surface carrying the teeth 9. Because of its mostly flat shape, the projection is also called a flange. For the sake of simplicity, this expression is also used when the projection has only a small height, as can be seen in FIG. 3. This flange can be positioned during the implantation in such a way that its abutment surface 16 facing dorsally sits in front of the ventral boundary surface 17 of the associated vertebral body 7.
  • the edge 18 of the flange can be rounded. So that the bone is not weakened too much, this presupposes that the flange is only a small height above the surface bearing the teeth 9. It should be in the order of 0 ⁇ 5 to -2 mm, - ve-rz-ugs eise z-wisG-h-en 0, -8 and 1.3 mm. Expressed in fractions of the maximum dimension of the
  • Implant in the anterior / posterior direction this is preferably 0.5 to 2 tenths.
  • the low height of the flange has the advantage that the size of the implant is greatly reduced compared to designs in which the flange is provided with fastening elements (eg screw holes).
  • the reduced dimensions enable implantation through an operation opening or an insertion channel with a correspondingly reduced diameter, for example in the case of endoscopic implantation.
  • the prosthesis according to the invention results in a very secure fit, the sawtooth-shaped teeth, which cause a "conveying direction" to the dorsal, prevent an undesired displacement to the ventral side, while the flange limits the dorsal movement of the prosthesis.
  • the position selected during the implantation, in which the stop surface 16 of the flange 15 bears against a corresponding ventral surface of the associated vertebral body or the recess created therein, is retained.
  • the safety of the prosthesis seat achieved by the teeth 9 depends on the prosthesis being seated with sufficient pressure between the adjacent vertebral bodies. This pressure is generally sufficient if the longitudinal ligament is retained posteriorly. If this is not possible, the doctor will prefer the additional securing with bone screws.
  • the flanges 15 have a greater height, as is indicated by the dash-dotted line 19, and.
  • the doctor will generally refrain from embedding this flange in the vertebral body by means of a recess worked out therein, because this could weaken the vertebral body too much. Rather, the prosthesis is usually used in this case so that the flange comes to lie in front of the ventral surface of the vertebra.
  • edges which can protrude ventrally beyond the escape area of the adjacent vertebral bodies are well rounded, as can be seen, for example, from edge 21.
  • the teeth 9 of the prosthesis should be so fine that the prosthesis reaches its final position in relation to the adjacent vertebral bodies immediately after the implantation. In other words, it should be avoided that the teeth later sink into the vertebral bodies to a more than negligible extent under the pressure that prevails between the adjacent vertebral bodies. This would involve an undesirable reduction in the cross-section of the nerve passages between the vertebrae.
  • a height of the teeth between 0.2 and 0.6 mm, preferably between 0.3 and 0.5 mm and a distance between the tooth tips of 0.4 to 2 mm, preferably from 0.6 to 1, have proven useful in this regard , 3 mm.
  • the ventral abutment surface 16 does not have to extend continuously across the width of the prosthesis. Rather, it can also be made of separate, spaced-apart Jumps are formed, which are advantageously arranged symmetrically. Two such projections 22 are indicated in Fig. 1. If a flange-shaped stop surface 16 is provided, this is expediently designed to be concave in accordance with the ventral boundary of the vertebral bodies, as can be seen in FIG. 2. If the flange does not contain any screw holes and is shortened accordingly to be worked into a recess of the vertebral body, it can. a rectilinear stop surface 16 may also be expedient because the end face of the recess which cooperates therewith can be shaped arbitrarily and a rectilinear shaping is particularly simple.

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  • Health & Medical Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Biomedical Technology (AREA)
  • Orthopedic Medicine & Surgery (AREA)
  • Neurology (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Oral & Maxillofacial Surgery (AREA)
  • Transplantation (AREA)
  • Cardiology (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)

Abstract

L'invention concerne une prothèse intervertébrale cervicale comprenant deux plaques de recouvrement qui doivent être raccordées à l'un des corps vertébraux adjacents. Au moins l'une des deux plaques de recouvrement (1, 3) est munie d'une denture (9) orientée vers le corps vertébral (7), dont les dents présentent un flanc vertical orienté ventral (10), et un flanc oblique, orienté dorsal (11). Lorsque la prothèse est soumise à une compression suffisante entre ses corps vertébraux adjacents, la combinaison de la denture en forme de dents de scie avec la surface de butée est appropriée pour maintenir de façon sûre la prothèse dans la position désirée. Ceci permet, dans de nombreux cas, de renoncer à une fixation par vis supplémentaire. Le flanc (15) portant la surface de butée (16) est raccourci de manière fonctionnelle, de telle façon qu'il puisse se loger à l'intérieur d'une cavité de l'os (7), et que la prothèse ne vienne pas ventralement en saillie au-delà de la surface d'affleurement ventrale du corps vertébral adjacent (7).
EP03704673A 2002-03-12 2003-02-21 Prothese intervertebrale cervicale Withdrawn EP1482876A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP03704673A EP1482876A1 (fr) 2002-03-12 2003-02-21 Prothese intervertebrale cervicale

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
EP02005631 2002-03-12
EP02005631A EP1344507A1 (fr) 2002-03-12 2002-03-12 Prothèse intervertébrale pour la colonne cervicale
US10/349,183 US7267691B2 (en) 2002-03-12 2003-01-23 Cervical intervertebral prosthesis
US349183 2003-01-23
EP03704673A EP1482876A1 (fr) 2002-03-12 2003-02-21 Prothese intervertebrale cervicale
PCT/EP2003/001803 WO2003075804A1 (fr) 2002-03-12 2003-02-21 Prothese intervertebrale cervicale

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EP1482876A1 true EP1482876A1 (fr) 2004-12-08

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EP02005631A Withdrawn EP1344507A1 (fr) 2002-03-12 2002-03-12 Prothèse intervertébrale pour la colonne cervicale
EP03704673A Withdrawn EP1482876A1 (fr) 2002-03-12 2003-02-21 Prothese intervertebrale cervicale

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EP02005631A Withdrawn EP1344507A1 (fr) 2002-03-12 2002-03-12 Prothèse intervertébrale pour la colonne cervicale

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EP (2) EP1344507A1 (fr)
JP (1) JP2005519673A (fr)
KR (1) KR100961020B1 (fr)
CN (1) CN100536803C (fr)
AR (1) AR038939A1 (fr)
AU (1) AU2003206943B2 (fr)
BR (1) BR0303375B1 (fr)
CA (1) CA2476479A1 (fr)
DE (1) DE20321074U1 (fr)
IL (1) IL163560A (fr)
MX (1) MXPA04008812A (fr)
PL (1) PL371031A1 (fr)
RU (1) RU2282422C2 (fr)
WO (1) WO2003075804A1 (fr)
ZA (1) ZA200406837B (fr)

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RU2004130309A (ru) 2005-04-10
IL163560A0 (en) 2005-12-18
MXPA04008812A (es) 2007-07-19
AR038939A1 (es) 2005-02-02
CA2476479A1 (fr) 2003-09-18
PL371031A1 (en) 2005-06-13
US20040083000A1 (en) 2004-04-29
WO2003075804A1 (fr) 2003-09-18
RU2282422C2 (ru) 2006-08-27
BR0303375A (pt) 2004-03-23
DE20321074U1 (de) 2005-12-01
KR100961020B1 (ko) 2010-06-01
CN1649552A (zh) 2005-08-03
ZA200406837B (en) 2005-11-30
EP1344507A1 (fr) 2003-09-17
AU2003206943B2 (en) 2008-07-10
KR20040091711A (ko) 2004-10-28
AU2003206943A1 (en) 2003-09-22
US7267691B2 (en) 2007-09-11
IL163560A (en) 2010-11-30
JP2005519673A (ja) 2005-07-07
BR0303375B1 (pt) 2012-01-10
CN100536803C (zh) 2009-09-09

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