CA2505850A1 - Articular facet interference screw - Google Patents

Articular facet interference screw Download PDF

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Publication number
CA2505850A1
CA2505850A1 CA002505850A CA2505850A CA2505850A1 CA 2505850 A1 CA2505850 A1 CA 2505850A1 CA 002505850 A CA002505850 A CA 002505850A CA 2505850 A CA2505850 A CA 2505850A CA 2505850 A1 CA2505850 A1 CA 2505850A1
Authority
CA
Canada
Prior art keywords
bone screw
screw
screw head
bone
threaded shaft
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
CA002505850A
Other languages
French (fr)
Other versions
CA2505850C (en
Inventor
Paul Pavlov
Robert Frigg
Beat Lechmann
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 CA2505850A1 publication Critical patent/CA2505850A1/en
Application granted granted Critical
Publication of CA2505850C publication Critical patent/CA2505850C/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
    • A61B17/88—Osteosynthesis instruments; Methods or means for implanting or extracting internal or external fixation devices
    • 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
    • A61B17/70—Spinal positioners or stabilisers ; Bone stabilisers comprising fluid filler in an implant
    • A61B17/7062—Devices acting on, attached to, or simulating the effect of, vertebral processes, vertebral facets or ribs ; Tools for such devices
    • A61B17/7064—Devices acting on, attached to, or simulating the effect of, vertebral facets; Tools therefor
    • 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
    • A61B17/8605—Heads, i.e. proximal ends projecting from bone
    • A61B17/861—Heads, i.e. proximal ends projecting from bone specially shaped for gripping driver
    • A61B17/8615—Heads, i.e. proximal ends projecting from bone specially shaped for gripping driver at the central region of the screw head
    • 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
    • A61B17/8625—Shanks, i.e. parts contacting bone tissue
    • 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
    • A61B17/685—Elements to be fitted on the end of screws or wires, e.g. protective caps
    • 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
    • A61B17/8625—Shanks, i.e. parts contacting bone tissue
    • A61B17/8635—Tips of screws
    • 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
    • A61B17/864—Pins or screws or threaded wires; nuts therefor hollow, e.g. with socket or cannulated
    • 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
    • A61B17/88—Osteosynthesis instruments; Methods or means for implanting or extracting internal or external fixation devices
    • A61B17/8875—Screwdrivers, spanners or wrenches
    • 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
    • A61B2017/8655—Pins or screws or threaded wires; nuts therefor with special features for locking in the bone

Abstract

The bone screw (1) is used for locking an articular facet between the superior and inferior articular processes of two vertebral bodies and is provided with a threaded shaft (2), a screw head (3) and a central axis (4). The screw head (3) is further provided with a number of grooves (5) on the periphery of the screw head (3) which run essentially parallel to said central axis (4).

Claims (28)

1. Bone screw (1), in particular for locking an articular facet between the superior and inferior articular processes of two vertebral bodies, having a threaded shaft (2), a screw head (3) and a central axis (4), whereby said screw head (3) is provided with at least one axial groove (5) on its periphery, characterized in that said bone screw (1) is provided with an anti-rotation element (10) insertable in said groove (5) or pair of grooves (5), whereby said anti-rotation element (10) in its inserted position projects radially out of the periphery of said screw head (3).
2. Bone screw (1) according to claim 1, characterized in that the at least one axial groove (5) is running essentially parallel to said central axis (4).
3. Bone screw (1) according to claim 1, characterized in that the at least one axial groove (5) has an angulation in a radial plane and measured relatively to said the central axis (4) in the order of less than 60° and preferably less than 20°.
4. Bone screw (1) according to claim 1, characterized in that the at least one axial groove (5) has an angulation in a tangential plane and measured relatively to said central axis (4) in the order of less than 20°.
5. Bone screw (1) according to claim 4, characterized in that the at least one axial groove (5) has an angulation in a tangential plane and measured relatively to said central axis (4) in the order of less than 10°.
6. Bone screw (1) according to one of the claims 1 - 5, characterized in that is provided with at least one pair of diametrally opposed grooves (5) on the periphery of said screw head (3).
7. Bone screw (1) according to one of the claims 1 - 6, characterized in that said screw head (3) is provided with a central cavity (6) coaxially arranged with respect to said central axis (4).
8. Bone screw (1) according to one of the claims 1 - 7, characterized in said that A) said anti-rotation element (10) is a U-shaped staple with two legs (11) and a central portion (13) bridging said two legs (11);and B) said anti-rotation element (10) is designed for insertion into said groove (5) or pair of grooves (5) of said screw head (3).
9. Bone screw (1) according to one of the claims 1 - 8, characterized in that said anti-rotation element (10) has a diameter which is larger than said screw head (3).
10. Bone screw (1) according to one of the claims 1 - 9, characterized in that said U-shaped staple is provided with a guiding element (12) attached to said central portion (13) and running essentially parallel to said legs (11).
11. Bone screw (1) according to claim 10, characterized in that said guiding element (12) is in the form of a plate, a circular cylinder or a prism designed for insertion into said central cavity (6) of said screw head (3).
12. Bone screw (1) according to one of the claims 8 to 11, characterized in that said central portion (13) is provided with at least one perforation (14).
13. Bone screw (1) according to one of the claims 1 to 12, characterized in that said threaded shaft (2) has a thread (7) with a high angle of pressure, preferably in the range of 4° to 70°.
14. Bone screw (1) according to claim 13, characterized in that the flank of said thread (7) is symmetrically oriented.
15. Bone screw (1) according to claim 13, characterized in that the flank of said thread (7) is asymmetrically oriented.
16. Bone screw (1) according to one of the claims 1 to 15, characterized in that it is self-tapping, preferably by means of a cutting edge.
17. Bone screw (1) according to one of the claims 6 to 16, characterized in that said central cavity (6) has a polygonal profile, preferably a hexagonal profile.
18. Bone screw (1) according to claim 17, characterized in that said grooves (5) on the periphery of said screw head (3) are juxtaposed to the polygonal planes of said central cavity (6).
19. Bone screw (1) according to one of the claims 1 to 18, characterized in that the core of said shaft (2) is cylindrical.
20. Bone screw (1) according to one of the claims 1 to 18, characterized in that the core of said shaft (2) tapering away from said screw head (3).
21. Bone screw (1) according to one of the claims 1 to 20, characterized in that the envelope of said threaded shaft (2) is cylindrical.
22. Bone screw (1) according to one of the claims 1 to 20, characterized in that the envelope of said threaded shaft (2) tapers away from said screw head (3).
23. Bone screw (1) according to one of the claims 1 to 22, characterized in that it is self-drilling, preferably by means of a chucking groove.
24. Method for locking an articular facet between the superior and inferior articular processes of two vertebral bodies, characterized in that, the threaded shaft (2) of a bone screw (1) is inserted in the gap of said articular facet.
25. Method according to claim 24, characterized in that said bone screw (1) is cannulated and insertion is performed by means of an aiming wire.
26. Method according to claim 24 or 25, characterized in that A) said bone screw (1) has a screw head (3) with a larger diameter than said threaded shaft (2); and B) said threaded shaft (2) is inserted in said gap of said articular facet until said screw head (3) touches the bone.
27. Method according to one of the claims 24 to 26, characterized in that upon insertion of said bone screw (1) an anti-rotation element (10) is applied to said screw head (3) such that rotation of said bone screw (1) is prevented.
28. Method according to one of the claims 24 to 27, characterized in that it is performed simultaneously on the right and left side of the vertebral column.
CA2505850A 2002-11-13 2002-11-13 Articular facet interference screw Expired - Fee Related CA2505850C (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/CH2002/000608 WO2004043278A1 (en) 2002-11-13 2002-11-13 Articular facet interference screw

Publications (2)

Publication Number Publication Date
CA2505850A1 true CA2505850A1 (en) 2004-05-27
CA2505850C CA2505850C (en) 2011-01-04

Family

ID=32304024

Family Applications (1)

Application Number Title Priority Date Filing Date
CA2505850A Expired - Fee Related CA2505850C (en) 2002-11-13 2002-11-13 Articular facet interference screw

Country Status (11)

Country Link
US (3) US7699878B2 (en)
EP (1) EP1585449B8 (en)
JP (1) JP4307387B2 (en)
AU (1) AU2002340694B2 (en)
BR (1) BR0215923B1 (en)
CA (1) CA2505850C (en)
DE (1) DE60214908T2 (en)
ES (1) ES2274099T3 (en)
MY (1) MY134584A (en)
TW (1) TWI296194B (en)
WO (1) WO2004043278A1 (en)

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