Classifications

• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
  • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
  • A61F2/02—Prostheses implantable into the body
  • A61F2/30—Joints
  • A61F2/44—Joints for the spine, e.g. vertebrae, spinal discs
  • A61F2/4455—Joints for the spine, e.g. vertebrae, spinal discs for the fusion of spinal bodies, e.g. intervertebral fusion of adjacent spinal bodies, e.g. fusion cages
  • A61F2/447—Joints for the spine, e.g. vertebrae, spinal discs for the fusion of spinal bodies, e.g. intervertebral fusion of adjacent spinal bodies, e.g. fusion cages substantially parallelepipedal, e.g. having a rectangular or trapezoidal cross-section
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
  • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
  • A61B17/02—Surgical instruments, devices or methods, e.g. tourniquets for holding wounds open; Tractors
  • A61B17/025—Joint distractors
  • A61B2017/0256—Joint distractors 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
  • A61F2/46—Special tools or methods for implanting or extracting artificial joints, accessories, bone grafts or substitutes, or particular adaptations therefor
  • A61F2/4603—Special tools or methods for implanting or extracting artificial joints, accessories, bone grafts or substitutes, or particular adaptations therefor for insertion or extraction of endoprosthetic joints or of accessories thereof
  • A61F2/4611—Special tools or methods for implanting or extracting artificial joints, accessories, bone grafts or substitutes, or particular adaptations therefor for insertion or extraction of endoprosthetic joints or of accessories thereof of spinal prostheses
• • 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
  • A61F2002/30003—Material related properties of the prosthesis or of a coating on the prosthesis
  • A61F2002/3006—Properties of materials and coating materials
  • A61F2002/3008—Properties of materials and coating materials radio-opaque, e.g. radio-opaque markers
• • 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
  • A61F2002/30593—Special structural features of bone or joint prostheses not otherwise provided for hollow
• • 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
  • A61F2002/30774—Apertures or holes, e.g. of circular cross section internally-threaded
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
  • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
  • A61F2/02—Prostheses implantable into the body
  • A61F2/30—Joints
  • A61F2/30767—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
  • A61F2002/30777—Oblong apertures
• • 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
  • A61F2002/30772—Apertures or holes, e.g. of circular cross section
  • A61F2002/30784—Plurality of holes
  • A61F2002/30789—Plurality of holes perpendicular with respect to each other
• • 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
  • A61F2002/30904—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
  • A61F2/46—Special tools or methods for implanting or extracting artificial joints, accessories, bone grafts or substitutes, or particular adaptations therefor
  • A61F2/4603—Special tools or methods for implanting or extracting artificial joints, accessories, bone grafts or substitutes, or particular adaptations therefor for insertion or extraction of endoprosthetic joints or of accessories thereof
  • A61F2002/4629—Special tools or methods for implanting or extracting artificial joints, accessories, bone grafts or substitutes, or particular adaptations therefor for insertion or extraction of endoprosthetic joints or of accessories thereof connected to the endoprosthesis or implant via a threaded 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
  • A61F2250/00—Special features of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
  • A61F2250/0058—Additional features; Implant or prostheses properties not otherwise provided for
  • A61F2250/0096—Markers and sensors for detecting a position or changes of a position of an implant, e.g. RF sensors, ultrasound markers
  • A61F2250/0098—Markers and sensors for detecting a position or changes of a position of an implant, e.g. RF sensors, ultrasound markers radio-opaque, e.g. radio-opaque markers
• • 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
• • 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
  • A61F2310/00023—Titanium or titanium-based alloys, e.g. Ti-Ni alloys
• • 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
  • A61F2310/00035—Other metals or alloys
  • A61F2310/00131—Tantalum or Ta-based alloys
• • 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
  • A61F2310/00035—Other metals or alloys
  • A61F2310/00155—Gold or Au-based alloys

Definitions

• the invention relates to an implant for the intervertebral space, according to the preamble of patent claim 1.
• intervertebral implants are known for use in the posterior lumbar fusion of two adjacent vertebral bodies.
• Such an implant for the intervertebral space is known from WO 95/08306 BECKERS.
• This known implant comprises a body with a lenticular profile in a plane, wherein the two convex surfaces for abutment against the deck or base of the adjacent vertebral bodies serve, so that this profile largely coincides with the biconcave shape of the sagittal section of the intervertebral space.
• the body has parallel flat sides. Further, the body is penetrated parallel to its central axis, that is from one contact surface to the other contact surface of a through-opening, so that the body can be filled with bone material.
• the rounding at the front of the body and the convex contact surfaces require no mechanical processing, such as milling or Meissein the basic or cover plate of the adjacent vertebral bodies.
• the cross-sectional axis orthogonal to the longitudinal axis has two roundings which are attached to diagonally lying corners, so that the implant can be introduced transversely, ie with its contact surfaces transversely to the longitudinal axis of the spine into the intervertebral space and then with a suitable tool in a direction of 90 ° can be rotated until the contact surfaces of the body come into contact with the base or cover plate of the adjacent vertebral bodies.
• a disadvantage of this known implant is that the Kunststofffambaen can be provided with a structuring, which have either parallel to the longitudinal axis grooves or transverse to the longitudinal axis grooves. Such structuring with symmetrical flanks of the teeth either directly favors or impedes the insertion of the implant into the intervertebral space and slipping it out, or prevents or impedes the rotation of the body in both directions of rotation.
• Another generic intervertebral implant is known from US 4,834,757 BRANTIGAN.
• This known intervertebral implant comprises a frame-like body which is provided on the contact surfaces as well as on the two lateral side surfaces with an asymmetric structuring, this structuring comprising sawtooth-like teeth whose flat flanks are directed against the front end of the body and thus upon insertion of the implant in The intervertebral space, the two adjacent vertebral bodies apart while the steep flanks catch and thus prevent slipping out of the implant.
• This known intervertebral implant comprises a frame-like body which is provided on the contact surfaces as well as on the two lateral side surfaces with an asymmetric structuring, this structuring comprising sawtooth-like teeth whose flat flanks are directed against the front end of the body and thus upon insertion of the implant in The intervertebral space, the two adjacent vertebral bodies apart while the steep flanks catch and thus prevent slipping out of the implant.
• a disadvantage of this known implant that the teeth complicate the rotation in both directions.
• the invention aims to remedy this situation.
• the invention has for its object to provide an implant for the intervertebral space, which allows rotation of the implant about the longitudinal axis of the body in a rotational direction and prevents in the opposite direction of rotation.
• the invention solves this problem with an implant for the intervertebral space, which has the features of claim 1.
• the macroscopic teeth are designed such that their central axes in the orthogonal to the longitudinal axis of the body considered cutting planes through the body are inclined to the median plane of the body.
• the teeth are formed such that their central axes are also inclined in orthogonal to the transverse axis through the body to the median plane, so that a preferred direction of displacement can be reached, whereby the insertion of the implant is simplified in the intervertebral space, while a Slipping is prevented.
• the teeth are formed as crooked pyramids or crooked cones, respectively oblique truncated pyramids or oblique truncated cones.
• the teeth are formed such that their central axes are parallel on at least one contact surface.
• the teeth are designed so that their central axes are parallel on each of the two contact surfaces.
• the teeth are configured such that their central axes enclose an angle + ⁇ on the upper contact surface in the sectional planes orthogonal to the longitudinal axis and an angle ⁇ on the lower contact surface.
• the height of the teeth relative to the corresponding contact surface is preferably between 0.15 mm and 1.5 mm.
• the teeth each have a steep one in two mutually perpendicular, orthogonal to the central axis considered cutting planes Flank and one flank each.
• the teeth are thus formed substantially as inclined pyramids, whereby a turning back and a lateral migration of the implanted implant can be prevented.
• the implant consists of a radiolucent material, which may be selected, for example, from the following group:
• PES Polyaryletherketones
• PEI Polyetherimide
• POM Polyosymethylene
• LCP Liquid Crystalline Polymer
• PMP Polymethylpentene
• PSU Polysulfone
• PESU Polyethersulfone
• PES Polyethylene Terephthalate
• PMMA Polymethylmethacrylate
• UHMW-PE Ultra High Molecular Weight Polyethylene
• Polymers which are reinforced by long or short fibers, for example of carbon are reinforced by long or short fibers, for example of carbon.
• the implant By making the implant from a radiolucent material, there is the advantage that the surgeon or the radiologist can better track bone perforation.
• the surface of the implant is roughened, whereby advantages in Knochenanwachs can be achieved.
• the surface roughness is preferably between 2 ⁇ m and 10 ⁇ m. Experience has shown that bone cells grow best on the surface of the implant in this area of surface roughness.
• the flat flanks of the teeth in viewed to the transverse axis orthogonal cutting planes with an angle parallel to the central axis of the body an angle ⁇ between 30 ° and 80 ° while the steep flanks with the same straight line an angle ß between 5 ° and 30 ° lock in.
• the angles ⁇ are between -30 ° and -80 ° and the angles ⁇ between -5 ° and -30 °.
• flank angles of the teeth are advantageous for setting the teeth in the end plates of the adjacent vertebral bodies.
• angles .alpha. And .gamma. Of the flat flanks and the angles .beta. And .delta. Of the steep flanks are the same, so that the resistance of the teeth optimally counteracts boring or migration.
• the geometry of the teeth is preferably formed in such a manner that the volume V of a survey of between 0.15 mm 3 and 1, 2 mm 3 is.
• the contact surfaces are completely provided with teeth.
• the steep flanks of the teeth are arranged in parallel planes. This achieves optimal resistance to screwing out or migration of the implant.
• the cuboid body is formed such that the orthogonal to the longitudinal axis, second cross-sectional area is rectangular and has a one-sided rounding.
• the advantage of this embodiment is that the rotation of the implant can be made only in one direction and on the opposite side of the rounding the contact surface can be used for attaching additional teeth. Thus, the number of teeth can still be kept high.
• the radius of the rounding is dimensioned such that the contact surface to the bone is reduced by the rounding by less than half, preferably by less than one third, so that the number of teeth on the contact surfaces can be kept high.
• the cuboid body is formed such that the orthogonal to the longitudinal axis, the second cross-sectional area is rectangular and has two diagonally mounted rounded portions. This makes it easier to manually rotate the implant during the operation.
• the radii of the two fillets are dimensioned such that the second cross-sectional area of the body is reduced by less than half, preferably by less than a quarter.
• the fillets are elliptical.
• the elliptical shape allows for easy starting during implant rotation. The resistance against the rotation is built up during the turning process, so that in the end position the resistance against turning back becomes maximum.
• the fillets have two different radii of curvature.
• the larger radius adjacent to the side surfaces simplifies implant rotation at the beginning.
• the rotational resistance is increased, so that in the end position the resistance to reverse rotation becomes maximum.
• the body having first and second lateral side surfaces intersecting the contact surfaces and the front side surface has fillets disposed diagonally between the first lateral side surface and the upper contact surface and between the second lateral side surface and the lower contact surface.
• the body has second fillets disposed between the front side surface intersecting the contact surfaces and the contact surfaces.
• the advantage of these second roundings is that that, unlike sharp edges, the bony structure of the adjacent vertebral bodies is not damaged.
• the rounding during insertion of the implant in the intervertebral space favor the displacement of the implant and prevent sticking.
• the implant comprises at least one, but preferably a plurality of X-ray markers.
• X-ray markers This provides the advantage that the position and orientation of the implant in the intervertebral space is visible intraoperatively or postoperatively in X-ray images.
• the number of X-ray marking is between one and six depending on the use of the implant.
• the body has at least one bore, so that an x-ray marker formed as a pin can be pressed into the bore.
• the pen is made of a radiopaque material.
• the at least one bore is arranged in the implant such that its bore axis is parallel to the central axis and lies in a plane spanned by the central axis and the longitudinal axis.
• the at least one pin comprises peripherally and axially centrally arranged at least one radially projecting nubs, which is plastically deformed when the pin is pressed into the bore, so that the pin is fixed by means of a press fit in the bore.
• the pin is made of a metal, preferably steel, titanium, tantalum or gold.
• FIG. 1 is a perspective view of an embodiment of the inventive implant
• FIG. 2 shows a first cross section through the embodiment of the implant according to the invention shown in FIG. 1;
• FIGS. 1 and 2 shows a longitudinal section through the embodiment of the implant according to the invention shown in FIGS. 1 and 2 with means for receiving a holding instrument;
• FIG. 4 shows a longitudinal section through an embodiment of the implant according to the invention with X-ray markings
• Fig. 5 is a plan view of the rear end of the embodiment of the inventive implant shown in Fig. 4.
• an embodiment of the implant 1 is shown, which a cuboid body 2 with an upper and a lower convex contact surface 3, 4 for abutment with the basic resp. Cover surface of the two adjacent vertebrae and a the contact surfaces 3, 4 intersecting central axis 5 comprises.
• Arranged transversely to the contact surfaces 3, 4 are two lateral side surfaces 18; 19, and a front side surface 16 and a rear side surface 17.
• the orthogonal to the central axis 5 longitudinal axis 14 intersects the two side surfaces 16; 17 while the transverse axis 15, which is also orthogonal to the central axis 5 of the body 2, intersects the two lateral side surfaces 18, 19.
• the longitudinal axis 14 and the transverse axis 15 define a center plane 6 which is orthogonal to the central axis 5 between the contact surfaces 3, 4.
• the body 2 is penetrated parallel to its central axis 5 from the upper contact surface 3 to the lower contact surface 4 of an opening 20. Parallel to the transverse axis 15, the body 2 is penetrated by three perforations 21 from the first lateral side surface 18 to the second lateral side surface 19.
• the body 2 thus has a frame-like shape with a central cavity, wherein the front and the rear side surface 16; 17 no holes opening into the cavity or openings.
• a first cross-sectional area 10 is defined, the cutting line coincides with the second, defined by the central axis 5 of the body 2 and the transverse axis 15 cross-sectional area 11 with the central axis 5 of the body 2.
• the contact surfaces 3, 4 are equipped with teeth 7 whose central axes 34 are inclined with respect to the median plane 36 of the body 2.
• the teeth 7 are designed such that their central axes 34 in the longitudinal axis 14 orthogonal considered cutting planes through the body 2 on the upper contact surface 3 an angle + ⁇ and on the lower contact surface 4 an angle - ⁇ with the median plane 36 include.
• the steep flanks 8 enclose an angle ⁇ with a straight line parallel to the central axis 5 of the body 2;
• the steep flanks 8 lie at both contact surfaces 3, 4 on the side of the teeth 7 facing the rear side surface 17.
• the steep flanks 12 of the teeth 7 are parallel to the upper contact surface 3 Longitudinal axis 14 as viewed from the front side surface 16 disposed on the right side of the teeth 7, while the steep edges 12 of the teeth 7 on the lower contact surface 4 are also arranged parallel to the longitudinal axis 14 from the front side surface 16 on the left side of the teeth 7 ,
• angles ⁇ and ⁇ between the steep flanks 8; 12 and parallel to the central axis 5 straight lines.
• angles ⁇ and ⁇ between the flat flanks 9; 13 and parallel to the central axis 5 of the body 2 straight lines.
• the arrangement of the steep flanks 8 in the first cross-sectional area 10 is such that when the implant 1 is inserted with the front side surface 16 ahead in an intervertebral space, the basic resp. Cover plate of the adjacent vertebral bodies are pressed apart by the flat flanks 9 of the teeth 7, while any slipping out of the implanted body 2 by the steep flanks 8 is prevented. Furthermore, the arrangement of the steep flanks 12 in the second cross-sectional area 11 is such that during a clockwise rotation of the inserted into the intervertebral space implant 1, the basic resp. Cover plate of the adjacent vertebral bodies are pressed apart by the flat flanks 13 of the teeth 7, while a left-hand rotation of the implanted body 2 is prevented by the steep flanks 12.
• the body 2 has to simplify the clockwise rotation during implantation between the contact surfaces 3, 4 and the lateral side surface 18; 19 roundings 23 with two different radii on.
• the rounded portions 23 are arranged such that they lie only in a diagonal in the second, to the longitudinal axis 14 orthogonal cross-sectional area 11, so that the rounded portions 23 between the upper contact surface 3 and the first lateral side surface 18 and between the lower contact surface 4 and the second lateral side surface 19 are arranged.
• With respect to the teeth 7 on the two contact surfaces 3, 4 are the rounded portions 23 on the side with the flat flanks 9; 13 attached.
• the body 2 has second rounded portions 24 for easier insertion of the implant 1 into the intervertebral space between the contact surfaces 3, 4 and the front side surface 16.
• the implant 1 comprises at its rear end 28 arranged means 22 for the rotationally fixed reception of the holding instrument.
• these means 22 for receiving a holding instrument comprise a bore 25, which is coaxial with the longitudinal axis 14 and has an internal thread 26, which penetrates from the rear side face 17 of the implant 1.
• the holding instrument is rotatably connected to the implant 1, a likewise from the rear side surface 17 penetrating, parallel to the transverse axis 15 extending channel 27 is attached to the implant 1.
• a segment of the holding instrument provided with an external thread is screwed into the internal thread 26 and then a segment 27 complementary to the channel is inserted into the channel 27.
• the implant 1 is connected to the corresponding, attachable to the rear end 28 of the implant 1 holding instrument (not shown).
• the insertion of the implant 1 is such that the lateral, not provided with teeth 7 side surfaces 18; 19 are aligned parallel to the deck or base of the adjacent vertebral bodies. Due to the partially resected dorsal structures of the vertebral bodies, the implant 1 can then be introduced into the intervertebral space.
• the surgeon rotates the implant 1 by 90 ° about the longitudinal axis 15 by means of the holding instrument, so that the contact surfaces 3, 4 provided with teeth 7 are fixed to the cover or base plate , With the rotation of the implant 1, the surgeon achieves a distraction in the anterior structures of the spine. Thus, among other things, the lordosis can be restored.
• a second implant 1 is introduced, so that an implant 1 is arranged on both sides of the spinal cord.
• the embodiment of the implant 1 according to the invention shown in FIGS. 4 and 5 comprises two x-ray markings 35.
• These x-ray markings 35 are in the form of pins 31 formed, which are introduced into bores 32.
• the pins 31 are peripherally and preferably axially centrally provided with three nubs 30.
• the nubs 30 are plastically deformed during the pressing of the pins 31 into the bores 32, so that the pins 31 are held in the bores 32 by means of a press fit.
• the body 2 has two bores 32, of which one bore 32 at the front end 29 of the implant 1 and the other bore 32 at the rear end 28 of the implant 1 are arranged.
• the bores 32 are configured such that their bore axes 33 are parallel to the central axis 5 and lie in a plane spanned by the central axis 5 and the longitudinal axis 14.

Landscapes

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

Applications Claiming Priority (1)

Publications (1)

Family

ID=33520332

Family Applications (1)

Country Status (11)

Cited By (1)

Families Citing this family (28)

Family Cites Families (14)

• 2003
  • 2003-06-24 CA CA002530730A patent/CA2530730A1/en not_active Abandoned
  • 2003-06-24 CN CNA038266814A patent/CN1787794A/zh active Pending
  • 2003-06-24 BR BRPI0318328-9A patent/BR0318328A/pt not_active IP Right Cessation
  • 2003-06-24 AU AU2003240354A patent/AU2003240354A1/en not_active Abandoned
  • 2003-06-24 EP EP03729770A patent/EP1635743A1/de not_active Withdrawn
  • 2003-06-24 JP JP2005500844A patent/JP4378343B2/ja not_active Expired - Lifetime
  • 2003-06-24 WO PCT/CH2003/000412 patent/WO2004112660A1/de active Application Filing
• 2004
  • 2004-06-03 TW TW093115933A patent/TW200505387A/zh unknown
  • 2004-06-04 CL CL200401388A patent/CL2004001388A1/es unknown
  • 2004-06-17 AR ARP040102102A patent/AR044792A1/es not_active Application Discontinuation
• 2005
  • 2005-12-22 US US11/318,937 patent/US8012208B2/en active Active
• 2011
  • 2011-08-30 US US13/221,375 patent/US8617247B2/en not_active Expired - Lifetime

Non-Patent Citations (2)

Also Published As

Similar Documents

Legal Events