CA2690038A1 - Dynamic stabilization connecting member with pre-tensioned solid core - Google Patents

Dynamic stabilization connecting member with pre-tensioned solid core Download PDF

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Publication number
CA2690038A1
CA2690038A1 CA2690038A CA2690038A CA2690038A1 CA 2690038 A1 CA2690038 A1 CA 2690038A1 CA 2690038 A CA2690038 A CA 2690038A CA 2690038 A CA2690038 A CA 2690038A CA 2690038 A1 CA2690038 A1 CA 2690038A1
Authority
CA
Canada
Prior art keywords
improvement
spacer
core extension
axis
anchor member
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
CA2690038A
Other languages
French (fr)
Other versions
CA2690038C (en
Inventor
Roger P. Jackson
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Individual
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 CA2690038A1 publication Critical patent/CA2690038A1/en
Application granted granted Critical
Publication of CA2690038C publication Critical patent/CA2690038C/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
    • A61B17/7001—Screws or hooks combined with longitudinal elements which do not contact vertebrae
    • A61B17/7002—Longitudinal elements, e.g. rods
    • A61B17/7011—Longitudinal element being non-straight, e.g. curved, angled or branched
    • 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
    • A61B17/7001—Screws or hooks combined with longitudinal elements which do not contact vertebrae
    • A61B17/7002—Longitudinal elements, e.g. rods
    • A61B17/7019—Longitudinal elements having flexible parts, or parts connected together, such that after implantation the elements can move relative to each other
    • A61B17/702—Longitudinal elements having flexible parts, or parts connected together, such that after implantation the elements can move relative to each other having a core or insert, and a sleeve, whereby a screw or hook can move along the core or in the sleeve
    • 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
    • A61B17/7001—Screws or hooks combined with longitudinal elements which do not contact vertebrae
    • A61B17/7002—Longitudinal elements, e.g. rods
    • A61B17/7004—Longitudinal elements, e.g. rods with a cross-section which varies along its length
    • 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
    • A61B17/7001—Screws or hooks combined with longitudinal elements which do not contact vertebrae
    • A61B17/7002—Longitudinal elements, e.g. rods
    • A61B17/7004—Longitudinal elements, e.g. rods with a cross-section which varies along its length
    • A61B17/7008—Longitudinal elements, e.g. rods with a cross-section which varies along its length with parts of, or attached to, the longitudinal elements, bearing against an outside of the screw or hook heads, e.g. nuts on threaded rods

Abstract

A dynamic longitudinal connecting member assembly includes an anchor member having an integral or otherwise fixed elongate core of circular or non-circular cross-section. The core is pre-tensioned and extends through at least one elastic spacer and at least one outer sleeve. The anchor member and the outer sleeve each attach to at least one bone anchor. In operation, the core is held in tension by the spacer.

Claims (31)

1. In a medical implant assembly having at least two bone attachment structures cooperating with a longitudinal connecting member, the improvement wherein the longitudinal connecting member comprises:

a) an anchor member portion in engagement with one of the at least two bone attachment structures, the anchor member portion having a pre-tensioned inner core extension of reduced diameter, the core extension extending from the anchor member portion along a substantially central axis of the longitudinal connecting member;

b) at least one compressible outer spacer, the core extension being received in the spacer, the spacer being positioned between the at least two bone attachment structures; and c) at least one sleeve, the core extension being received within the sleeve and in slidable relationship therewith, the sleeve being in engagement with the other of the at least two bone attachment structures.
2. The improvement of claim 1 further comprising an elastic bumper, the core extension being received within the bumper and the bumper engaging the sleeve.
3. The improvement of claim 1 further comprising a crimping ring fixed to the core extension at an end thereof opposite the anchor member portion.
4. The improvement of claim 1 wherein the inner core extension has a substantially circular cross-section measured perpendicular to the axis.
5. The improvement of claim 1 wherein the inner core extension has a non-circular cross- section measured perpendicular to the axis.
6. The improvement of claim 1 wherein the anchor member portion has a substantially circular cross-section measured perpendicular to the axis.
7. The improvement of claim 1 wherein the anchor member portion has a non-circular cross-section measured perpendicular to the axis.
8. The improvement of claim 1 wherein the spacer has opposed parallel load-bearing end surfaces disposed substantially perpendicular to the axis.
9. The improvement of claim 1 wherein the spacer has opposed non-parallel load-bearing end surfaces disposed substantially perpendicular to the axis.
10. The improvement of claim 1 wherein the spacer has a pair of opposed trapezoidal surfaces running substantially parallel to the axis.
11. The improvement of claim 1 wherein the core extension is substantially linear.
12. The improvement of claim 1 wherein the core extension is bent at an angle with respect to the anchor member portion along the central axis.
13. The improvement of claim 12 wherein the core extension is bent at a location corresponding to the placement of the at least one spacer.
14. The improvement of claim 1 wherein the core extension is integral to the anchor member portion.
15. The improvement of claim 1 wherein the core extension is fixed to the anchor member portion.
16. The improvement of claim 15 wherein the core extension has a helical thread near an end thereof and the anchor member portion has a threaded aperture, the helical thread mating with the threaded aperture.
17. The improvement of claim 1 wherein the longitudinal connecting member has a substantially constant outer width along an entire length thereof.
18. The improvement of claim 17 wherein the outer width is an outer diameter.
19. The improvement of claim 1 wherein the at least one spacer has a first outer width that is greater than a second outer width of the sleeve.
20. The improvement of claim 19 wherein the first and second outer widths are outer diameters.
21. In a medical implant assembly having at least two bone attachment structures cooperating with a longitudinal connecting member, the improvement wherein the longitudinal connecting member comprises:

a) an anchor member having a pre-tensioned inner core extension extending therefrom along an elongate central axis, the core extension having a non-circular cross-section measured perpendicular to the axis;

b) at least one compressible outer spacer, the core being slidingly received in the spacer along the axis, the spacer being positioned between the at least two bone attachment structures; and c) at least one sleeve, the core being slidingly received within the sleeve along the axis, the sleeve being in engagement with at least one of the bone attachment structures.
22. The improvement of claim 21 further comprising an elastic bumper, the core being received within the bumper and the bumper engaging the sleeve.
23. The improvement of claim 21 wherein the core has a rectangular cross-section.
24. The improvement of claim 21 wherein the spacer has opposed parallel load-bearing end surfaces disposed substantially perpendicular to the axis.
25. The improvement of claim 21 wherein the spacer has opposed non-parallel load-bearing end surfaces disposed substantially perpendicular to the axis.
26. The improvement of claim 21 wherein the spacer has a pair of opposed trapezoidal surfaces running substantially parallel to the axis.
27. The improvement of claim 21 wherein the core extension is substantially linear.
28. The improvement of claim 21 wherein the core extension is bent at an angle with respect to the anchor member portion along the central axis.
29. The improvement of claim 28 wherein the core extension is bent at a location corresponding to the placement of the at least one spacer.
30. The improvement of claim 21 wherein the core extension is integral to the anchor member portion.
31. A longitudinal connecting member comprising:

a) a first portion having an outer surface of a first width, the outer surface sized and shaped for direct frictional attachment to a first pedicle screw;

b) a second portion integral to the first portion, the second portion having an outer surface of a second width, the second width being smaller than the first width;

c) an elastic spacer having a first through bore, the second portion sized and shaped to be slidingly received in the first through bore;

d) a sleeve having a second through bore, the second portion sized and shaped to be slidingly received in the second through bore, the sleeve sized and shaped for direct frictional attachment to a second pedicle screw; and e) a fixing structure having a third through bore, the second portion sized and shaped to be received in the third through bore and fixed to the fixing structure, the fixing structure holding the second portion in tension and the elastic spacer in compression.
CA2690038A 2007-05-31 2008-05-29 Dynamic stabilization connecting member with pre-tensioned solid core Expired - Fee Related CA2690038C (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US93256707P 2007-05-31 2007-05-31
US60/932,567 2007-05-31
PCT/US2008/006818 WO2008153827A1 (en) 2007-05-31 2008-05-29 Dynamic stabilization connecting member with pre-tensioned solid core

Publications (2)

Publication Number Publication Date
CA2690038A1 true CA2690038A1 (en) 2008-12-18
CA2690038C CA2690038C (en) 2012-11-27

Family

ID=40130034

Family Applications (1)

Application Number Title Priority Date Filing Date
CA2690038A Expired - Fee Related CA2690038C (en) 2007-05-31 2008-05-29 Dynamic stabilization connecting member with pre-tensioned solid core

Country Status (5)

Country Link
US (1) US7951170B2 (en)
EP (1) EP2160158A4 (en)
AU (1) AU2008263148C1 (en)
CA (1) CA2690038C (en)
WO (1) WO2008153827A1 (en)

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US7951170B2 (en) 2011-05-31
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EP2160158A1 (en) 2010-03-10
AU2008263148A1 (en) 2008-12-18
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AU2008263148B2 (en) 2011-11-03

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