CA2471843A1 - Device for osteosynthesis - Google Patents

Device for osteosynthesis Download PDF

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Publication number
CA2471843A1
CA2471843A1 CA002471843A CA2471843A CA2471843A1 CA 2471843 A1 CA2471843 A1 CA 2471843A1 CA 002471843 A CA002471843 A CA 002471843A CA 2471843 A CA2471843 A CA 2471843A CA 2471843 A1 CA2471843 A1 CA 2471843A1
Authority
CA
Canada
Prior art keywords
bushing
hole
section
cross
bone
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.)
Granted
Application number
CA002471843A
Other languages
French (fr)
Other versions
CA2471843C (en
Inventor
Claude Mathieu
Robert Frigg
Harald Saner
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.)
Synthes USA LLC
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of CA2471843A1 publication Critical patent/CA2471843A1/en
Application granted granted Critical
Publication of CA2471843C publication Critical patent/CA2471843C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
    • 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, setting implements or the like
    • 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, e.g. tourniquets
    • 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, setting implements or the like
    • 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
    • A61B17/8695—Washers

Abstract

The device for performing osteosynthesis comprises a bone plate (1) with an underside (2), which is intended for resting against the bone, with an upper side (3), at least one passage (4), which joins the underside (2) to the upp er side (3) and is provided for accommodating a multiaxially pivotal insert (10 ) for a bone screw (20), whereby the passage (4) has a central axis (5). The inventive device also comprises an insert (10), which can be inserted into t he passage (4), is provided with a central boring (11) for accommodating a bone screw (20), whereby the boring (11) has a longitudinal axis (12), and the insert has a peripheral outer surface (17) intended for placing in contact with the passage (4). The insert (10) is designed so that it can be radially compressed and radially expanded, and the cross-section (6) of the passage (4), which is orthogonal to the central axis (5), is non-circular. The cross - section (16) of the insert (10) that is orthogonal to the longitudinal axis (12) has a shape that essentially corresponds to the cross-section (6) of th e passage (4) of the bone plate (1), and the insert (10) inserted in the passa ge (4) is fixed so that it does not rotate in relation to the longitudinal axis (12) thereof but, inside the passage (4), remains pivotal in relation to the boneplate (1).

Claims (51)

1. A device for osteosynthesis, comprising a fixation element having a through hole designed to receive a multiaxially pivotal bushing for a bone screw, the through hole having a central axis and a non-circular cross-section extending orthogonally to the central axis; and a bushing insertable in said through hole, the bushing including a central bore designed to receive a bone screw, the bore having a longitudinal axis, and a peripheral outer surface configured and dimensioned to be in contact with at least a portion of the interior surface of the through hole;
wherein the bushing is configured and dimensioned to be radially compressible and radially expansible, and a cross section of the bushing extending orthogonally to the longitudinal axis of the bushing is shaped substantially the same as the cross section of the through hole such that when the bushing is inserted in the through hole, it is secured against rotation relative to its longitudinal axis while remaining pivotally adjustable relative to the fixation element.
2. The device of claim 1, wherein the cross section of the through hole is polygonally shaped.
3. The device of claim 2, wherein the cross section of the through hole is hexagonally shaped.
4. The device of claim 1, wherein the through hole of the fixation element is prismatically shaped.
5. The device of claim 4, wherein the through hole of the fixation element is shaped as a hexagonal prism.
6. The device of claim 1, wherein both the through hole and the bushing are shaped in a form resembling a toothed wheel.
7. The device of claim 1, wherein the bore of the bushing tapers in one direction.
8. The device of claim 1, wherein the bore of the bushing has a conical shape.
9. The device of claim 1, wherein the bore of the bushing has a cylindrical shape.
10. The device of claim 1, wherein the bore of the bushing has an internal thread.
11. The device of claim 1, wherein the cross section of the through hole is elliptically shaped.
12. The device of claim 1, wherein the cross section of the through hole is defined by two incomplete semicircles connected to one another by means of non-circular lines.
13. The device of claim 1, wherein the bushing has a continuous slot.
14. The device of claim 13, wherein the slot extends parallel to the longitudinal axis of the bushing.
15. The device of claim 1, wherein the bushing has a plurality of non-continuous slots extending parallel to the longitudinal axis of the bushing.
16. The device of claim 1, wherein at least a portion of a the peripheral, outer surface of the bushing is roughened.
17. The device of claim 16, wherein the peripheral, outer surface of the bushing is roughened by means of grit blasting.
18. The device of claim 1, wherein the bushing is formed of a first material and at least a portion of the peripheral, outer surface of the bushing is coated with a second material, and the second material is harder than the first material.
19. The device of claim 1, wherein at least a portion of peripheral, outer surface of the bushing has peripheral ridges.
20. The device of claim 19, wherein at least a portion of the through hole has peripheral ridges.
21. The device of claim 1, wherein at least a portion of the through hole is roughened.
22. The device of claim 1, wherein the fixation element is formed of a first material and the through hole is coated with a second material, and the second material is harder than the first material.
23. The device of claim 1, wherein the through hole includes a reduced cross section proximal a bottom surface of the fixation element and proximal a top surface of the fixation element to prevent dislodgment of the bushing.
24. The device of claim 23, wherein the reduced cross section of the through hole and the compressibility of the bushing are configured and adapted to permit insertion of the compressible bushing into the through hole.
25. The device of claim 1, wherein the peripheral, outer surface of the bushing is convex.
26. The device of claim 1, wherein an inner surface of the through hole is concave and the peripheral, outer surface of the bushing is prismatic.
27. The device of claim 1, wherein the fixation. element and the bushing are at least partially formed of materials of different hardness.
28. The device of claim 1, wherein the fixation element is formed of plastic and the bushing is formed of metal.
29. The device of claim 1, wherein the bushing has a height measured in the direction of its longitudinal axis, and the through hole of the fixation element has a height measured in the direction of its central axis, and the height of the bushing is less than the height of the through hole.
30. The device of claim 29, wherein the height of the bushing is between 40 and 85 percent of the height of the through hole.
31. The device of claim 30, wherein the height of the bushing is between 45 and 65 percent of the height of the through hole.
32. The device of claim 1, further comprising a bone screw having a threaded shaft for anchoring within the bone, a longitudinal screw axis, and a screw head configured and dimensioned for insertion into the central bore of the bushing.
33. The device of claim 32, wherein the screw head corresponds substantially to the central bore of the bushing.
34. The device of claim 32, wherein a cross section of the screw head orthogonal to the longitudinal screw axis conically tapers towards the threaded shaft.
35. The device of claim 32, wherein the screw head includes external threads.
36. The device of claim 1, wherein the fixation element is a bone plate having a bottom surface designed to bear against bone, and a top surface, and the through hole extends from the bottom surface to the top surface.
37. The device of claim 1, wherein the fixation element is a pedicle screw or a pedicle hook.
38. The device of claim 1, wherein the fixation element is an external fixator.
39. The device of claim 1, wherein the fixation element is an intervertebral implant.
40. A bone plate, comprising a bottom surface for contacting bone, an upper surface, and at least one through hole extending from the bottom surface to the upper surface, the through hole having a central axis and a non-circular cross-section orthogonal to the central axis; and a bushing within the through hole, the bushing including a central bore designed to receive a bone screw, the bore having a longitudinal axis, and a peripheral outer surface configured and dimensioned to be in contact with at least a portion of the interior surface of the through hole;
wherein the bushing is configured and dimensioned to be radially compressible and radially expansible, and a cross section of the bushing orthogonal to the longitudinal axis of the bushing is shaped substantially the same as the cross section of the through hole so that the bushing is secured against rotation relative to its longitudinal axis while remaining pivotally adjustable relative to the bone plate.
41. The bone plate of claim 40, wherein the through hole is polygonally shaped.
42. The bone plate of claim 41, wherein the through hole is hexagonally shaped.
43. The bone plate of claim 40, wherein the bushing has at least one continuous slot.
44. The bone plate of claim 40, wherein the bushing has a height measured in the direction of its longitudinal axis, and the through hole of the fixation element has a height measured in the direction of its central axis, and the height of the bushing is less than the height of the through hole.
45. A bone plate system, comprising a bone plate having a bottom surface for contacting bone, an upper surface and at least one through hole extending from the bottom surface to the upper surface, the through hole having a central axis and a non-circular cross-section orthogonal to the central axis; and a bushing within the through hole, the bushing including a central bore designed to receive a bone screw, the bore having a longitudinal axis, and a peripheral outer surface configured and dimensioned to be in contact with at least a portion of the interior surface of the through hole; and at least one bone screw having a threaded shaft for anchoring within the bone, a longitudinal screw axis, and a screw head configured and dimensioned for insertion into the central bore of the bushing wherein the bushing is configured and dimensioned to be radially compressible and radially expansible, and a cross section of the bushing orthogonal to the longitudinal axis of the bushing is shaped substantially the same as the cross section of the through hole so that the bushing is secured against rotation relative to its longitudinal axis while remaining pivotally adjustable relative to the bone plate.
46. The system of claim 45, wherein the through hole is polygonally shaped.
47. The system of claim 46, wherein the through hole is hexagonally shaped.
48. The system of claim 45, wherein the bushing has at least one continuous slot.
49. The system of claim 45, wherein the screw head of the at least one screw is conically tapered.
50. The system of claim 49, wherein the screw head of the at least one screw is at least partially threaded.
51. The system of claim 45, wherein the bushing has a height measured in the direction of its longitudinal axis, and the through hole of the fixation element has a height measured in the direction of its central axis, and the height of the bushing is less than the height of the through hole.
CA2471843A 2001-12-24 2001-12-24 Device for osteosynthesis Expired - Fee Related CA2471843C (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/CH2001/000740 WO2003055401A1 (en) 2001-12-24 2001-12-24 Device for performing osteosynthesis

Publications (2)

Publication Number Publication Date
CA2471843A1 true CA2471843A1 (en) 2003-07-10
CA2471843C CA2471843C (en) 2011-04-12

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Family Applications (1)

Application Number Title Priority Date Filing Date
CA2471843A Expired - Fee Related CA2471843C (en) 2001-12-24 2001-12-24 Device for osteosynthesis

Country Status (19)

Country Link
US (6) US7682379B2 (en)
EP (1) EP1458299B1 (en)
JP (1) JP4125238B2 (en)
CN (1) CN1271976C (en)
AR (1) AR037904A1 (en)
AT (1) ATE306221T1 (en)
AU (1) AU2002220448B2 (en)
BR (1) BR0117199B1 (en)
CA (1) CA2471843C (en)
DE (1) DE50107716D1 (en)
DK (1) DK1458299T3 (en)
ES (1) ES2250307T3 (en)
IL (1) IL162232A0 (en)
MY (1) MY134176A (en)
NO (1) NO20043153L (en)
NZ (1) NZ533664A (en)
SI (1) SI1458299T1 (en)
TW (1) TWI225396B (en)
WO (1) WO2003055401A1 (en)

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