EP1791501A1 - Prothese pour le remplacement partiel d'un corps vertebral - Google Patents

Prothese pour le remplacement partiel d'un corps vertebral

Info

Publication number
EP1791501A1
EP1791501A1 EP05744291A EP05744291A EP1791501A1 EP 1791501 A1 EP1791501 A1 EP 1791501A1 EP 05744291 A EP05744291 A EP 05744291A EP 05744291 A EP05744291 A EP 05744291A EP 1791501 A1 EP1791501 A1 EP 1791501A1
Authority
EP
European Patent Office
Prior art keywords
anchoring
bridging part
vertebral body
bone
projections
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Withdrawn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
EP05744291A
Other languages
German (de)
English (en)
Inventor
Arnold Keller
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 EP05744291A priority Critical patent/EP1791501A1/fr
Publication of EP1791501A1 publication Critical patent/EP1791501A1/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Withdrawn legal-status Critical Current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
    • A61F2/30767—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
    • A61F2/28—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
    • 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
    • A61F2002/305—Snap connection
    • 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
    • A61F2002/30518—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements with possibility of relative movement between the prosthetic parts
    • A61F2002/30523—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements with possibility of relative movement between the prosthetic parts by means of meshing gear teeth
    • 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
    • A61F2002/30563—Special structural features of bone or joint prostheses not otherwise provided for having elastic means or damping means, different from springs, e.g. including an elastomeric core or shock absorbers
    • 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
    • A61F2002/30565—Special structural features of bone or joint prostheses not otherwise provided for having spring 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
    • 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
    • A61F2002/30579—Special structural features of bone or joint prostheses not otherwise provided for with mechanically expandable devices, e.g. fixation devices
    • 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
    • A61F2002/30665—Dual arrangement of two adjacent 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
    • 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
    • A61F2002/30784—Plurality of holes
    • A61F2002/30785—Plurality of holes 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
    • A61F2002/30795—Blind bores, e.g. of circular cross-section
    • 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

Definitions

  • 4109941, Fig. 8 are partially replaced.
  • This comprises an upper connecting plate for connection to the upper adjacent vertebral body, a lower connecting plate for connection to the lower adjacent vertebral body and, in between, a bridging part for bridging the part of the vertebral body to be partially replaced. If the vertebral body to be partially replaced is still completely preserved only on the vertebral arch side, a bone cavity is created on its front side into which the bridging part is inserted.
  • it has laterally projecting webs which contain a slot for receiving a fastening screw.
  • the invention has for its object to provide a prosthesis of the aforementioned type, in which the likelihood of movement problems is reduced.
  • the solution according to the invention consists in the features of claim 1 and preferably those of the subclaims. It is then provided that the bridging part of the prosthesis to be inserted into the bone cavity has lateral anchoring projections which are movable between a retracted implantation position and a protruding anchoring pitch. This results in the possibility of initially precisely adjusting the prosthesis, possibly under X-ray control, and then by simply pushing out the anchoring projections in its instantaneous direction. To fix position. Apart from the preparation of the bone cavity, no processing steps are necessary whose tolerances could adversely affect the exact positioning.
  • a prosthesis for partial replacement of a Wirbelkör ⁇ pers (US-A-4892545) is known, the bridging part is anchored only to the two vertebral bodies, which are adjacent to the teilzuer ⁇ settling vertebral bodies, and for this purpose has projections which after insertion of the Pro ⁇ thesis be extended up and down in the adjacent vertebral bodies. These should be immobilized in relation to the bridged vertebral body. A joint is unavailable. Since there is thus no movement between adjacent vertebral bodies, there are also no complaints of movement. feared by inaccurate positioning of the prosthesis.
  • the known prosthesis could therefore not convey to the person skilled in the art that the use of retractable anchoring projections which can be pushed forward and which are arranged at a different location avoids movement problems in prostheses equipped with a joint.
  • the bridging member should have a shape conforming to the shape of the cavity, for example, so that it can be inserted deeply into the bone cavity and the anchoring projections take effect at a location where there is enough surrounding bone substance for a solid anchorage , Preferably, it has an undercut-free, tapered in the insertion direction shape, so that the Knochenhöh ⁇ ment can be made with the greatest possible consistency with its shape.
  • those forms are preferred which can be produced in the bone in the simplest possible and precise manner.
  • An example of this is a shape bounded by flat surfaces, which can be produced by means of a bone suture and, if appropriate, a guide that guides it.
  • the shape of the bone cavity and the corresponding shape of the bridging part to be used determine the direction in which -tr the part inserted therein could escape if it were not anchored, namely contrary to the direction of insertion. Since the projections are intended to prevent movement in this direction, they must engage the bone substance transversely to this direction. This generally assumes that they are arranged laterally on the bridging part. Since the anchoring projections are pulled back during the implantation, they do not hinder the implantation. Only then are they moved into the projecting anchoring position.
  • anchoring projections are movable by the same mechanism. This facilitates the operation, because only a single movement step is required to transfer all the jointly movable anchoring projections into the anchoring position.
  • a driving member can be provided which acts on all associated anchoring projections. It is particularly advantageous if it moves the anchoring projections in different directions, for example two anchoring projections in the opposite direction.
  • the drive member may be formed so that it can cause the movement of the Veran ⁇ k réellesvorsprünge by rotation.
  • a particularly advantageous embodiment of the driving member is a toothed pinion which engages in racks which are connected to the anchoring projections, this has the advantage that the pushing distance of the projections between the implantation position and the anchoring position is not limited to the cam height of the driving member.
  • the anchoring projections or the driving member used for their movement expediently can be actuated from the side of the implant from which the implant is inserted into the bone cavity.
  • the anchoring 'of the implant takes place in the bone not only by the anchoring projections, the part to be inserted into the bone cavity is expediently designed so that sicli can intimately connect the bone tissue with its surface.
  • it also has openings or pores for receiving bone tissue.
  • a cavity may be provided which is accessible through the openings or pores and which is or can be provided with a filling of bone material (including bone substitute material).
  • a bone cavity is created in the latter from the front side, which matches the shape of the bridging part and absorbs it substantially completely.
  • the bridging part is made narrower than the vertebral body.
  • the bridging part and the vertebral body are based on one another by positive engagement.
  • the overbearing part contains the lateral anchoring projections which hold it in the bone cavity.
  • the bridging member can be easily inserted into the bone cavity. Thereafter, they are pushed out, invade both sides of the Knochenge ⁇ weave and thereby reach their anchoring position. Appropriately, they can be actuated from the front of the bridging part.
  • FIG. 2 is a frontal view of the same implant
  • FIG. 3 is a perspective view of a second embodiment obliquely from the front
  • FIG. 4 is a sectional view of the embodiment of FIG. 3, FIG.
  • Fig. 7 is a section along section line V of Fig. 6,
  • Fig. 8 is a front view of a fourth embodiment
  • Fig. 9 a frontal section
  • Fig. 10 is a plan view
  • Fig. 12 the outer end of an anchoring projection.
  • FIG. 2 shows an upper vertebrae body 1 and a lower vertebral body 2, between which a vertebral body 3 to be partially replaced is located.
  • a prosthesis is inserted between the upper and lower vertebral bodies. It comprises an upper connecting plate 5 which is connected to the upper vertebral body 1, a lower connecting plate 6 which is connected to the lower vertebral body 2, and a bridging part 7 which connects the plates 5 and 6. Between the connection plates 5 and 6 and the bridging part 7 is in each case a Ge steering (for example, according to EP-A-550140) with a Gelenk ⁇ surface 8.
  • a Ge steering for example, according to EP-A-550140
  • Articular surface can also be another type of gel was ⁇ used, for example, such a flexible cushion (DE-U-20115281) or with bending spring (DE-A-4109941). Finally, it is possible to use only one joint between the upper connection plate 5 and the bridging part 7 or between the lower connection plate 6 and the bridging part 7.
  • connection plates 5 and 6 have a usual size, which in the interest of low Ditruck
  • the bridging part 7 has a width that is beträcht ⁇ Lich lower than that of the teilzuerstrict Wir ⁇ bel stressess 3. This creates the possibility of the bridging part in one of the Vozrderseite in the Wirbelkör ⁇ by 3rd inserted bone cavity.
  • the bridging part forms the part to be inserted into the bone cavity.
  • the bone cavity has a shape which corresponds as exactly as possible to the shape of the bridging part 7. This makes possible a full-surface, backlash-free installation of the implant surface on the artificially created surface of the bone. On the one hand, this results in a substantially play-free mutual support.
  • this opens up the possibility of a stabilization resulting from bone growth. len connection between the bone and the implant. And finally, this ensures that the anchoring projections 9 provided on the implant engage in the bone tissue with essentially their full length in order to be able to transfer the anchoring forces.
  • bone cavity should not contain any restriction with regard to the shape. In particular, this applies to the depth and the lateral closure of the bone cavity. It only needs to be so deep that so much bone material is present laterally next to the part inserted therein that anchorage by means of the anchoring projections can take place thereon. In the example illustrated here, it is open at the top and bottom.
  • openings 12 or pores may be provided in which growing bone substance can be anchored. To speed up this process, the openings can be pre-filled with bone chips. It is also possible to coat the implant with an osteoconnective or osteoinductive substance.
  • FIG. 3 and 4 show an embodiment with projections 15 which are retracted during implantation in the ÜlDrbrückungsteil and then moved into the anchoring position.
  • the bridging part 7 has a transverse slot, which appears in Fig. 4 as a non-hatched area. It is on a shaft 13, a catch 14 Gert gela ⁇ , the rotational position shown in a first, dot-dash line is completely withdrawn into the implant and darg in the solid lines ⁇ esteilten Dreh ⁇ position with its protrusions 15 forming ends via the side surfaces 10 protrudes.
  • a significant advantage of the projections which can be extended after insertion of the bridging part is that they permit the subsequent correction of the position of the bridging part.
  • Knochen ⁇ cavity should not be done as accurately t would be worth seeing as it wishes, they give the opportunity to serve used to bridge ckungsteil with game use and the exact Positionie ⁇ tion to leave the projections, which are then extended when he has reached his anatomically correct position.
  • the implant may include a plurality of slits arranged parallel with one another at a distance, with latches 14 arranged on the shaft 13, which are transferred jointly into the locking state by the movement of the shaft 13 and then into the bone substance at a suitable axial distance one behind the other intervention.
  • FIGS. 5 to 7 A further embodiment of movable anchoring projections is shown in FIGS. 5 to 7.
  • the bridging part 7 contains a transverse slot 20 which serves as a guide for two latches 21, which assume the end positions shown in FIGS. 5 and 6 can.
  • the ends of the bolts form the anchoring projections 15. They contain a slot 22 which runs in the direction of the transmission and by a pin 23 fixed in the bridging part is permeated. It prevents them from moving further out of the implant than corresponds to the anchoring position shown in FIG.
  • the game in this embodiment example as a rotary cam 24 is formed, which is fixedly arranged at. End of a shaft 25. If it is rotated from the position of FIG. 5, in which it lies narrowly between the bars 21, by 90 ° in the position of FIG. 6, it spreads the bars 21 apart until their ends as anchoring projections over the implant protrude and anchor it in the bone.
  • the shaft 25 is at its end, which is accessible in the front surface of the bridging part, with
  • Key attachment surfaces 16 provided for a rotary instrument. Means, not shown, can be provided which hold the shaft 25 in the bridging part 7 and secure it in the anchoring position according to FIG.
  • FIG. 10 shows the structure of the bridging part 7 of the fourth embodiment. It is formed by a narrow core part 29 and a cage 30, which surrounds the key part 29 at a distance.
  • the hinge part 4 (see Fig. 1) is fixed, which forms an upper joint with a connection plate 5, not shown.
  • a joint surface 8 is provided, which forms a lower joint, not shown, with a joint part 4, not shown, and a lower connection plate 6.
  • the cage contains a plurality of holes 31 which allow the ingrowth of bone substance. If desired, this can be promoted by making your space between the core part 29 and the cage 30 with neutral or homologous bone substance or e-bone nodule. chenersatzsubstanz is filled. This filling can be prepared fabrik ⁇ moderately.
  • the cage 30 is narrower than the teilzuer mecanicder vertebral body 3 is formed so that it can be set ein ⁇ in a formed therein, open at the front bone cavity. Its cross-sectional shape is limited by flat surfaces. This facilitates the preparation of a matching to the shape of the cage bone cavity and the exact insertion of the cage.
  • the pinion 36 or the pinion shaft 37 is provided with actuating surfaces 38 which are accessible from the front of the implant for a rotary instrument. If the pinion is rotated clockwise in FIG. 11), the toothed racks 33 with the projections 32 are pushed outwards into the anchoring position from the assembly position. This is done when the implant is inserted and has reached its intended position. The projections penetrate into the bone located laterally of the bone cavity. chen Schle and anchor the bridging part 7 da ⁇ by it.
  • a securing device is provided.
  • This is designed as a securing screw 38 which can be screwed into the core part 29 into a securing position preventing the movement of the toothed racks as soon as the projections have reached the anchoring position.
  • it may press against a rack or against the pinion to prevent it from moving by friction, or it may engage in the space between the pinion 36 and a projection 32 or between the meshing teeth of pinion 36 and rack 33, in order to lock it in a form-fitting manner in the anchoring position in this way.
  • an anchoring projection 15 or 32 is provided with a surface 27 which is inclined with respect to the direction 26 in which the anchoring projection is pushed out of the implant into the anchoring position. It is therefore called an inclined surface.
  • the surrounding bone substance exerts a force component transversely to the extension direction 26 in the direction of the arrow 40 on this inclined surface. This force component is received by the implant, which pushes the implant in the direction of this force. This can be used to further push the part to be accommodated by the bone cavity into the bone cavity in order to achieve a seat which is as firm as possible.
  • the inventive inclined surface is characterized by the feature that it is arranged on one side. This is true not only of cases in which there is no slanted surface on the opposite side, but also of cases in which an opposing slanted surface produces a smaller force component, for example, because it is smaller or its angle is less favorable.
  • the inclined surface 27 forms a facet of a cutting edge. But this is not a prerequisite for their effect.
  • a leaf-shaped anchoring projection could instead be guided in its entirety obliquely to the direction of its leaf surface.

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

Abstract

L'invention concerne une prothèse servant à remplacer partiellement un corps vertébral. Cette prothèse comprend un corps de pontage destiné à être placé dans une cavité osseuse, ainsi qu'au moins une articulation. Le corps de pontage présente des tétons d'ancrage (15) qui peuvent être déplacés entre une position d'implantation rentrée et une position d'ancrage sortie.
EP05744291A 2004-09-23 2005-05-18 Prothese pour le remplacement partiel d'un corps vertebral Withdrawn EP1791501A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP05744291A EP1791501A1 (fr) 2004-09-23 2005-05-18 Prothese pour le remplacement partiel d'un corps vertebral

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP04022670A EP1639968A1 (fr) 2004-09-23 2004-09-23 Implant avec une partie d'insertion et de fixation dans une cavité d'os
PCT/EP2005/005407 WO2006032308A1 (fr) 2004-09-23 2005-05-18 Prothese pour le remplacement partiel d'un corps vertebral
EP05744291A EP1791501A1 (fr) 2004-09-23 2005-05-18 Prothese pour le remplacement partiel d'un corps vertebral

Publications (1)

Publication Number Publication Date
EP1791501A1 true EP1791501A1 (fr) 2007-06-06

Family

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Family Applications (2)

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EP04022670A Withdrawn EP1639968A1 (fr) 2004-09-23 2004-09-23 Implant avec une partie d'insertion et de fixation dans une cavité d'os
EP05744291A Withdrawn EP1791501A1 (fr) 2004-09-23 2005-05-18 Prothese pour le remplacement partiel d'un corps vertebral

Family Applications Before (1)

Application Number Title Priority Date Filing Date
EP04022670A Withdrawn EP1639968A1 (fr) 2004-09-23 2004-09-23 Implant avec une partie d'insertion et de fixation dans une cavité d'os

Country Status (15)

Country Link
US (2) US8070812B2 (fr)
EP (2) EP1639968A1 (fr)
JP (1) JP4568330B2 (fr)
KR (1) KR20070058384A (fr)
CN (1) CN101027018B (fr)
AR (1) AR055459A1 (fr)
AU (1) AU2005287678B2 (fr)
BR (1) BRPI0510312A (fr)
CA (1) CA2556999A1 (fr)
IL (1) IL177570A (fr)
MX (1) MXPA06010749A (fr)
RU (1) RU2340311C2 (fr)
TW (1) TW200614976A (fr)
WO (1) WO2006032308A1 (fr)
ZA (1) ZA200607237B (fr)

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Also Published As

Publication number Publication date
AU2005287678A1 (en) 2006-03-30
KR20070058384A (ko) 2007-06-08
CN101027018B (zh) 2010-10-06
JP2008513068A (ja) 2008-05-01
RU2340311C2 (ru) 2008-12-10
US8409285B2 (en) 2013-04-02
CN101027018A (zh) 2007-08-29
BRPI0510312A (pt) 2007-10-16
EP1639968A1 (fr) 2006-03-29
AR055459A1 (es) 2007-08-22
AU2005287678B2 (en) 2011-08-18
US8070812B2 (en) 2011-12-06
CA2556999A1 (fr) 2006-03-30
ZA200607237B (en) 2007-11-28
WO2006032308A1 (fr) 2006-03-30
IL177570A0 (en) 2006-12-10
TW200614976A (en) 2006-05-16
US20120059471A1 (en) 2012-03-08
JP4568330B2 (ja) 2010-10-27
IL177570A (en) 2010-05-17
MXPA06010749A (es) 2007-02-19
US20060064167A1 (en) 2006-03-23

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