CA2548504A1 - Bone fixation assembly and method of securement - Google Patents

Bone fixation assembly and method of securement Download PDF

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Publication number
CA2548504A1
CA2548504A1 CA002548504A CA2548504A CA2548504A1 CA 2548504 A1 CA2548504 A1 CA 2548504A1 CA 002548504 A CA002548504 A CA 002548504A CA 2548504 A CA2548504 A CA 2548504A CA 2548504 A1 CA2548504 A1 CA 2548504A1
Authority
CA
Canada
Prior art keywords
bushing
passage
screw
bone
seat
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
CA002548504A
Other languages
French (fr)
Other versions
CA2548504C (en
Inventor
Brian E. Dalton
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.)
Aesculap Inc
Original Assignee
Aesculap, Inc.
Brian E. Dalton
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 Aesculap, Inc., Brian E. Dalton filed Critical Aesculap, Inc.
Publication of CA2548504A1 publication Critical patent/CA2548504A1/en
Application granted granted Critical
Publication of CA2548504C publication Critical patent/CA2548504C/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

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
    • A61B17/70—Spinal positioners or stabilisers ; Bone stabilisers comprising fluid filler in an implant
    • A61B17/7059—Cortical plates
    • 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
    • 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
    • A61B17/8023—Variable length plates adjustable in both directions
    • 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

Abstract

A bone plate assembly (10) is provided for fixation of spaced vertebra. The bone plate assembly (10) has at least one through passage (15, 25) for securing the plate to bone with a bone fixation screw (23). The threaded shaft of a bone fixation screw (23) is inserted through a bushing (30) located in the through passage (15, 22) of the bone plate assembly (10) and the screw (23) is thereby threadably secured to the underlying bone and the bushing (30) is then compressed inward against the head (25) of the screw (23) with cams (37) that are actuated by rotating the bushing in the through passage (15, 22) whereby the screw (23) is locked relative to the bone plate assembly (10). The bushing (30) is not only compressed inwardly against the head (25) of the screw (23) but is also compressed downwardly by the cams (37) into a seat (39) to clamp separate elements (11, 12) of the bone plate assembly (10) together.
An access passage (51) in upper surface (41, 42) of bushing (30) is dimensioned (d) for receiving screw head (25) therethrough for access to a socket bore (35) within the bushing (30).

Claims (13)

1. A bone fixation assembly comprising:
(a) a fixation device having a through passage;
(b) a fastening screw having a threaded shaft for insertion through the through passage and threadable insertion into bone, and a head having substantially frustospherical shaped side surfaces;
(c) a bushing having;
(i) upper and lower surfaces;
(ii) a side wall with an exterior surface configured and dimensioned for axial rotation within said through passage of the fixation device and an interior surface which defines a socket bore that extends through the upper and lower surfaces and is configured and dimensioned for polyaxial rotation of said screw head therein;
and (iii) at least one slot located on the sidewall for allowing inward compression of said bore against said screw head; and (iv) an access passage in said upper surface dimensioned for receiving said screw head therethrough for access to said socket bore;
(d) cam means disposed between said through passage and said bushing and configured and dimensioned for inwardly compressing said bushing upon axial rotation thereof in said through passage whereby said bore is compressed against said screw head for locking said screw at a desired attitude relative to said fixation device.
2. The bone fixation assembly of claim 1 wherein said bushing socket bore has a substantially frustospherical shape with a central longitudinal axis.
3. The bone fixation assembly of claim 2 wherein said socket bore extends through the central axis of said bushing and is perpendicular to the upper and lower surfaces.
4. The bone fixation assembly of claim 3 wherein one of said at least one slot is a slot extending fully through said side wall from the upper surface through the lower surface and said access passage is dimensioned for receiving said screw head therethrough with a snap fit by expanding said access passage.
5. The bone fixation assembly of claim 4 wherein a bottom portion of said through passage has an inverted frustoconical seat and said exterior surface of said bushing has a mating inverted frustoconical base configured and dimensioned for seating in said seat, said seat and said base coaxial with said central axis, said cam means comprised of annularly spaced upwardly extending ramp cams on said upper surface of said bushing and said access passage including inwardly extending overhangs on said through passage positioned above said upper surface and having downwardly facing cam following surfaces configured and dimensioned for engaging said ramp cams when said bushing is axially rotated in said through passage whereby said bushing is driven downwardly into said seat by said ramp cams to thereby inwardly compress said bushing bore against said screw head.
6. The bone fixation assembly of claim 5 wherein said cam means includes radially extending ramp cams on said exterior surface of said bushing dimensioned and configures for compressing said socket bore inwardly when said bushing is axially rotated in said though passage.
7. The bone fixation assembly of claim 6 wherein said cam means includes ridges on at least one of said cams.
8. The bone fixation assembly of claim 4 wherein a bottom portion of said through passage has an inverted frustoconical seat and said exterior surface of said bushing has a mating inverted frustoconical base configured and dimensioned for seating in said seat, said seat and said base coaxial with said central axis, said cam means comprised of a threaded engagement between said bottom portion of said through passage and said bushing base whereby when said bushing is rotated in said through passage seat said bushing is drawn into said seat and thereby inwardly compressed against said screw head.
9. The bone fixation assembly of claim 8 wherein said threaded engagement is configured with left hand threads.
10. The bone fixation assembly of claim 1 wherein said fixation device is a bone plate having a first screw receiving socket element at a distal end of said assembly and configured with a screw shank passage and a screw head seat for attachment to bone with the aid of a bone fixation screw, an elongate arm extending proximally from said first socket element and having an elongate through slot therealong, a second screw receiving socket element including said through passage containing said bushing and said cam means and slidably received over said arm with said socket bore aligned over said slot for receiving the shank of a fixation screw therethrough for attachment to bone, said bushing seat including portions of said through slot whereby said second socket element is clamped to said arm when said bushing is pressed downwardly into said seat by said cam means.
11. A method for securing a bone plate having a through passage to bone, the method comprising the steps of:
inserting a bushing into the through passage;
inserting the shaft of a fastening screw having a head and a threaded shaft through the bushing located in the through passage of the bone plate;
threading the fastening screw into a bone until the screw head is drawn into an interior socket bore in the bushing; and compressing the bushing inward against the head of the screw with cam means actuated by rotating the bushing in the through passage whereby the screw is locked relative to the bone plate.
12. The method of claim 11 wherein the step of compressing also includes compressing the bushing downwardly into a seat to clamp separate elements of said bone plate together.
13. The method of claim 11 wherein threading of the screw includes rotating the screw clockwise and rotating the bushing includes rotating the bushing counterclockwise.
CA2548504A 2003-12-09 2004-10-06 Bone fixation assembly and method of securement Expired - Fee Related CA2548504C (en)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
US10/731,625 2003-12-09
US10/731,625 US6945975B2 (en) 2003-07-07 2003-12-09 Bone fixation assembly and method of securement
US10/815,160 2004-03-31
US10/815,160 US6979334B2 (en) 2003-07-07 2004-03-31 Bone fixation assembly and method of securement
PCT/US2004/032798 WO2005060845A1 (en) 2003-12-09 2004-10-06 Bone fixation assembly and method of securement

Publications (2)

Publication Number Publication Date
CA2548504A1 true CA2548504A1 (en) 2005-07-07
CA2548504C CA2548504C (en) 2012-07-03

Family

ID=37579085

Family Applications (1)

Application Number Title Priority Date Filing Date
CA2548504A Expired - Fee Related CA2548504C (en) 2003-12-09 2004-10-06 Bone fixation assembly and method of securement

Country Status (10)

Country Link
US (4) US6945975B2 (en)
EP (1) EP1691699B1 (en)
JP (1) JP4456607B2 (en)
CN (1) CN100435743C (en)
AU (1) AU2004305481B2 (en)
BR (1) BRPI0417500B1 (en)
CA (1) CA2548504C (en)
ES (1) ES2404031T3 (en)
HK (1) HK1099504A1 (en)
WO (1) WO2005060845A1 (en)

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US6945975B2 (en) 2005-09-20
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