Classifications

• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
  • A61B17/00—Surgical instruments, devices or methods
  • A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
  • A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws or setting implements
  • A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
  • A61B17/80—Cortical plates, i.e. bone plates; Instruments for holding or positioning cortical plates, or for compressing bones attached to cortical plates
  • A61B17/8004—Cortical plates, i.e. bone plates; Instruments for holding or positioning cortical plates, or for compressing bones attached to cortical plates with means for distracting or compressing the bone or bones
  • A61B17/8014—Cortical plates, i.e. bone plates; Instruments for holding or positioning cortical plates, or for compressing bones attached to cortical plates with means for distracting or compressing the bone or bones the extension or compression force being caused by interaction of the plate hole and the screws
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
  • A61B17/00—Surgical instruments, devices or methods
  • A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
  • A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws or setting implements
  • A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
  • A61B17/80—Cortical plates, i.e. bone plates; Instruments for holding or positioning cortical plates, or for compressing bones attached to cortical plates
  • A61B17/8033—Cortical plates, i.e. bone plates; Instruments for holding or positioning cortical plates, or for compressing bones attached to cortical plates having indirect contact with screw heads, or having contact with screw heads maintained with the aid of additional components, e.g. nuts, wedges or head covers
  • A61B17/8047—Cortical plates, i.e. bone plates; Instruments for holding or positioning cortical plates, or for compressing bones attached to cortical plates having indirect contact with screw heads, or having contact with screw heads maintained with the aid of additional components, e.g. nuts, wedges or head covers wherein the additional element surrounds the screw head in the plate hole
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
  • A61B17/00—Surgical instruments, devices or methods
  • A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
  • A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws or setting implements
  • A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
  • A61B17/80—Cortical plates, i.e. bone plates; Instruments for holding or positioning cortical plates, or for compressing bones attached to cortical plates
  • A61B17/8052—Cortical plates, i.e. bone plates; Instruments for holding or positioning cortical plates, or for compressing bones attached to cortical plates immobilised relative to screws by interlocking form of the heads and plate holes, e.g. conical or threaded
  • A61B17/8057—Cortical plates, i.e. bone plates; Instruments for holding or positioning cortical plates, or for compressing bones attached to cortical plates immobilised relative to screws by interlocking form of the heads and plate holes, e.g. conical or threaded the interlocking form comprising a thread
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
  • A61B17/00—Surgical instruments, devices or methods
  • A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
  • A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws or setting implements
  • A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
  • A61B17/84—Fasteners therefor or fasteners being internal fixation devices
  • A61B17/86—Pins or screws or threaded wires; nuts therefor
  • A61B17/8605—Heads, i.e. proximal ends projecting from bone
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
  • A61B17/00—Surgical instruments, devices or methods
  • A61B2017/00004—(bio)absorbable, (bio)resorbable or resorptive

Definitions

• the invention relates to a bone plate having a plurality of holes arranged in the direction of the longitudinal axis of the plate for receiving bone screws and to a bone fixation system having a bone plate.
• the holes have a smaller diameter portion with partial thread to a bone screw with cylindrical
• elongated holes with an internal thread extending at one end of the slot from the top to the bottom of the bone plate and a circumferential or central angle in the range of 190-280 °, present.
• the internal thread takes up the entire Depth of the elongated hole, tapers against the
• Bottom of the bone plate conical and has a cone angle in the range of 5 to 20 °.
• oblong holes are provided in the bone plate, which may be formed oval, elliptical or rectangular or include a combination of such forms; only circular holes have been explicitly excluded from this definition of the slot.
• the slot is combined with a circular hole and this is provided with a three-dimensional structuring, which is in the form of an internal thread or a peripheral lamella or lip. Shown is a conical internal thread, extending from the top to the bottom of the
• Bone plate extends and a perimeter or
• Bone screw below the ball head a short piece of thread, which is able to deform the projections in the slot and to convert. It is possible, the bone screw in different
• the invention is based on the object
• Bone screws - those with conical seating surfaces and those with ball seating surfaces - can be applied to meet the different requirements for fixing a
• bone fragments should be able to be displaced relative to each other during fixation.
• the bone plate has a preferably elongate plate body of tissue-compatible, rigid material, which determines a top and bottom and a longitudinal axis. Are transverse to the disk plane
• Screw shaft of a bone screw is formed.
• a radial rib is provided, which starts from the hole conversion and extends in a plane towards the round hole center. It is within the scope of the invention that provide this rib in a plane and not as a thread with a slope
• a threaded bone screw on the screw head can be supported on the rib of the smaller round hole and allow engagement with the rib of the larger round hole, whereby mutual clamping takes place.
• this clamping can also lead to an elastic deformation, which, however, after the
• Bone screw from the plate are therefore no burrs or grooves on the bone screw or on the
• the first, larger round hole has three sections, namely an upper,
• the smaller round hole includes an upper portion with a sloped transition region toward the top of the plate, and further a middle section below the level of the
• circumferential rib with inclined-rounded surface and a lower, cylindrical or conical section with a diameter smaller than the diameter of the upper or middle section.
• bone screws can be used with a head which is provided in its upper portion with screw thread and in its lower portion with a conical seat, in such a way that when screwed vertically into a bone displacement of the head relative to the Hole formation takes place in such a way that bone fragments
• the new bone plate also allows the use of
• Figure 1 is a plan view of a hole formation in one
• FIG. 2 is a sectional view of the hole formation
• Figure 3 is a perspective view of
• FIG. 4 shows a bone screw in engagement with a bone screw
• FIG. 5 a perspective view of a second embodiment of a bone plate
• FIG. 6 is a sectional view of the hole formation
• FIG. 7 shows a side view of the hole formation
• FIG. 8 shows a bone screw in engagement with a bone screw
• Figure 9 shows another embodiment of a bone plate with a circumferential rib with different
• FIG. 10 shows a detail enlargement of a part of a
• FIG. 11 shows a cross-sectional view along the line AA and thus parallel to the longitudinal axis of the further embodiment of the illustrated in Figure 9
• FIG. 12 shows a detail enlargement of a part of a
• FIG. 13 shows a cross-sectional view along the line BB and thus transversely to the longitudinal axis of the further embodiment of FIG Bone plate running with inserted
• Figure 14 is a still further embodiment of a
• Bone plate having a circumferential rib of different height in the radial direction, wherein the axis of symmetry of the circumferential rib relative to the axis of symmetry of the underlying under the rib conical portion of the larger
• Round hole is arranged offset and at which corresponding radii to the respective
• FIG. 16 is a cross-sectional view of that in FIGS. 14 and
• Figure 17 is a cross-sectional view of the in FIG. 14 and FIG.
• Line BB would correspond in Figure 9 and thus transverse to the longitudinal axis of the in Figures 14 and 15 shown yet another embodiment of the bone plate extending but without
• the figures show the piece of a bone plate, which consists of a preferably elongated plate body 1
• the plate body 1 can be out of oblong oval, round or polygonal
• tissue-compatible material for example, metals and their alloys are understood as these are commonly used for the production of implants.
• Preferred metals include titanium in any form, preferably also its alloys TiAl6V4 and TiCp. Also steels, such as implant steel,
• alloy 1.4441 are advantageously used.
• Another class of materials includes this as well
• resorbable materials such as magnesium or magnesium
• PLA is a biocompatible and resorbable plastic made of chemically bonded lactic acid molecules, which can be used like other resorbable plastics.
• a bone plate is considered to be stiff if it constructively provides the rigidity necessary for its intended use and intended use. This can be ensured by the thickness and width of the plate, depending on the tissue-compatible material used, and is usually within the skill of the art.
• bone plates are thinner and often less wide for small and less stressed parts of the body, such as the hand and foot bones
• Bone plates of the larger and more heavily loaded parts such as parts of the lower and the
• the bone plate has a top 11 and a
• Bottom 12 which are usually parallel to the plane of the plate, the bottom 12 to be fixed
• Bone is adjacent.
• the hole formations 2 are lined up along the longitudinal axis of the elongated plate body 1 and consist of two stepped round holes, 21 and 22, which extend transversely to the plane of the plate and whose axes 21a, 22a intersect the longitudinal axis of the bone plate.
• the smallest diameter of the first round hole 21 is larger than the smallest diameter of the second round hole 22, and the distance of the two axes 21 a and 22 a from each other is smaller than the smallest diameter of the first round hole 21.
• the intersection of the holes 21,22 results in edges 23,24, which are the areas of the round holes
• an upper region 25 and a lower region 26 of the round hole 21 and an upper region 27 and a lower region 28 of the round hole 22 can be distinguished.
• the upper regions 25 and 27 are designed in a shoof-like projection, while the lower regions 26 and 28
• the upper regions 25 and 27 have larger diameters than the lower regions 26 and 28.
• the lower region 26 forms a frusto-conical portion extending to the
• the lower region 28 is cylindrical, but it may also be frusto-conical.
• a radial rib 33 extends around the hole formation 2 in a plane.
• Rib 33 is formed as a circumferential ridge and has a wedge-shaped cross-section, which extends to the center of the each round hole tapers. In plan view, the rib 33 of an eight appears to be similar.
• a ridge 61 is arranged parallel to the projection 33 on the outer edge of the larger round hole 21 for the attached to the larger round hole rib portion 61, whereby an edge 24 to the second round hole 22 forms.
• the height of the ridge 61 increases towards the edge of the plate body 1, as best seen in the comparison of Fig. 4 with Fig. 3.
• Between the ridge 61 and the rib 33 is a passage
• the larger round hole 21 has above the projection 33 has an upper, nikkehlförmigen portion 31 with or without ridge 61, and below the rib 33 are a middle, nikkehlförmiger section 36 and a lower, frusto-conical or conical section 26 is provided.
• the smaller round hole 22 includes an upper portion 35 with an insertion slope 62, a middle portion 36 with a sloping-rounded surface 63 below the plane of the rib 33, and a lower one
• Section 28 which is preferably cylindrical, but may also be conical.
• the bone plate is designed to cooperate with at least two types of bone screws.
• One type has a bone screw head
• Partial spherical underside and can be at the
• FIG. 4 Another type of applicable bone screw 4 is shown in FIG.
• This bone screw 4 has a screw head 40 with internal engagement and external thread 41 at the upper end and conical support surface 42 at the lower end, the cone inclination corresponds to the cone slope of the lower region 26 of the larger round hole 21.
• Support surface 42 at the lower end of the screw head 40 of the bone screw 4 has an angle relative to the longitudinal or symmetry axis of each of the bone screw or the round hole 21 in the range of 3 to 30 °.
• this cone angle is in a range of 6 to 20 °, and most preferably in a range of 8 to 12 °.
• the external thread 41 may be cylindrical, but conical thread is preferred.
• the screw head 40 is followed by a screw shaft 43, which is intended to be anchored in a bone element to be fixed.
• the circumferential rib 33 extends in a plane, preferably parallel to the plane of the plate, while the thread 41 extends along helical surfaces, which extend naturally obliquely with respect to the plane of the radial rib 33, even if the bone screw 4 parallel or gleich founded with the axis 21a of
• the burr 61 is useful because it is a
• the bone screw 4 can be used for mutual approach and compression of bone fragments.
• the bone screw 4 is attached with its axis parallel to the axis 22a of the round hole 22.
• Bone plate is already firmly connected, this will Bone fragment pushed against the bone fragment to be fixed, as desired.
• Screw head 40 a sufficiently strong connection between the plate body 1 and the bone screw 4 is made, since the circumferential rib 33 after clamping of the
• FIG. 5-8 is another embodiment of
• Bone plate shown, wherein the same reference numerals are used for corresponding parts.
• the main difference is in the formation of the circumferential radial rib 33. This is partially cut away in the region of the smaller round hole 22 to a inclined-rounded sliding surface 35 a and a
• transition surface 35b which are useful for guiding the head of a cooking screw with a part-spherical underside of the head. It is a residual rib 37 is formed, which increases to full size of the rib 33 in the region of the larger round hole 21. The remaining edge 34 extends less than 180 ° and thus allows the lateral introduction of bone screws from the smaller round hole 22 in the larger round hole 21st
• Figure 9 shows a further embodiment of a bone plate 1 with a circumferential rib 33 shows, wherein this circumferential rib 33 a different height in the radial direction, ie to the axis of symmetry, which, for example, with the
• Reference numeral 71 is approximately defined by the section of the plane AA with the plane BB has.
• the circumferential rib 33 of the bone plate 1 has a wedge-shaped cross-section in which the height of the wedge-shaped cross section in the radial direction along one revolution, however, is not constant in this further embodiment, this does not have the same value for each section.
• the wedge-shaped cross section of the circumferential rib 33 is regional
• FIG. 1 shown further embodiment of the bone plate 1 shows running.
• the flattening 72 reduces the radial height defined so that it is reduced in this embodiment
• the thread of the bone screw can be arranged freely in front of the circumferential rib 33, which in relation to the
• FIG. 12 shows a detail enlargement of a part of the cross-sectional view from FIG. 13 along the line BB and thus transversely to the longitudinal axis of FIG. 9
• the height in the radial direction of the wedge-shaped cross section of the circumferential rib (33) is substantially zero in some areas.
• FIG. 14 shows a further embodiment of a bone plate 1 with a peripheral rib 33
• the circumferential rib 33 may also have the same radial height over the entire circumference and only by the
• the circle formed by the radius 72 extends symmetrically to the axis of symmetry 71 of the circumferential radial rib 33 and the circle formed by the radius 73 symmetrical to the axis of symmetry 74 of the conical
• the offset between the axes of symmetry 73 and 74, indicated by "x" in Figure 14, defines the change in the radial height of the rib 33. This offset is not limited to the direction shown in Figure 14, but may be arranged in any other direction.
• FIG. 15 shows the further embodiment of the bone plate 1 shown in FIG. 14, but without the corresponding radii 72, 73 around the respective one
• Symmetry axis 71, 74 to make their actual shape easier to see.
• FIG. 16 shows a cross-sectional view of the yet further embodiment shown in FIGS. 14 and 15, parallel to the longitudinal axis of FIGS. 14 and 15
• Bone plate 1 running, but without inserted
• FIG. 17 is a cross-sectional view of the in FIG. 14 and FIG.
• FIG. 17 shows an arrangement in which it is shown in FIG.
• the circumferential rib 33 may have the effect of chamfering, which score and rupture tendencies at higher
• Loads such as bending loads of the bone plate
• a fixation system for bone with bone plate and bone screws is created in the bone screws with round head in different
• Bevel angle to the bone plate can be set.
• fixation system allows the use of bone screws with conical head, the relative displacement between bone fragment to be fixed and bone plate, which allows the surgeon to move bone fragments in their fixation against each other.

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• Health & Medical Sciences (AREA)
• Orthopedic Medicine & Surgery (AREA)
• Surgery (AREA)
• Life Sciences & Earth Sciences (AREA)
• Heart & Thoracic Surgery (AREA)
• Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
• Engineering & Computer Science (AREA)
• Biomedical Technology (AREA)
• Neurology (AREA)
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• Animal Behavior & Ethology (AREA)
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Citations (6)

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• 2010
  • 2010-06-24 DE DE102010025001.5A patent/DE102010025001B4/de not_active Expired - Fee Related
• 2011
  • 2011-06-24 PT PT117302083T patent/PT2584983E/pt unknown
  • 2011-06-24 BR BR112012032577A patent/BR112012032577A2/pt not_active Application Discontinuation
  • 2011-06-24 KR KR1020137002017A patent/KR101742742B1/ko not_active Expired - Fee Related
  • 2011-06-24 JP JP2013515770A patent/JP5847173B2/ja not_active Expired - Fee Related
  • 2011-06-24 US US13/805,444 patent/US8888825B2/en active Active
  • 2011-06-24 PL PL11730208T patent/PL2584983T3/pl unknown
  • 2011-06-24 MX MX2013000010A patent/MX2013000010A/es active IP Right Grant
  • 2011-06-24 AU AU2011269258A patent/AU2011269258B2/en not_active Ceased
  • 2011-06-24 EP EP11730208.3A patent/EP2584983B1/de active Active
  • 2011-06-24 RU RU2013103045/14A patent/RU2560903C2/ru active
  • 2011-06-24 CA CA2803185A patent/CA2803185C/en not_active Expired - Fee Related
  • 2011-06-24 ES ES11730208.3T patent/ES2535191T3/es active Active
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  • 2011-06-24 WO PCT/EP2011/003111 patent/WO2011160846A1/de not_active Ceased
  • 2011-06-24 CN CN201180037396.1A patent/CN103068329B/zh active Active
• 2012
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• 2014
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