CA2677403A1 - Polyaxial bone screw with spherical capture, compression insert and alignment and retention structures - Google Patents

Polyaxial bone screw with spherical capture, compression insert and alignment and retention structures Download PDF

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Publication number
CA2677403A1
CA2677403A1 CA002677403A CA2677403A CA2677403A1 CA 2677403 A1 CA2677403 A1 CA 2677403A1 CA 002677403 A CA002677403 A CA 002677403A CA 2677403 A CA2677403 A CA 2677403A CA 2677403 A1 CA2677403 A1 CA 2677403A1
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CA
Canada
Prior art keywords
receiver
assembly
shank
insert
bone screw
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
CA002677403A
Other languages
French (fr)
Other versions
CA2677403C (en
Inventor
Roger P. Jackson
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Individual
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Individual
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Filing date
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Application filed by Individual filed Critical Individual
Publication of CA2677403A1 publication Critical patent/CA2677403A1/en
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Publication of CA2677403C publication Critical patent/CA2677403C/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
    • A61B17/7035—Screws or hooks, wherein a rod-clamping part and a bone-anchoring part can pivot relative to each other
    • 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
    • A61B17/7035—Screws or hooks, wherein a rod-clamping part and a bone-anchoring part can pivot relative to each other
    • A61B17/7037—Screws or hooks, wherein a rod-clamping part and a bone-anchoring part can pivot relative to each other wherein pivoting is blocked when the rod is clamped
    • 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
    • A61B17/7032—Screws or hooks with U-shaped head or back through which longitudinal rods pass

Abstract

A polyaxial bone screw assembly includes a receiver, a shank, an articulation structure for retaining the shank in the receiver and a compression insert for engagement with a longitudinal connecting member such as a rod. The articulation structure includes substantially spherical convex and concave surfaces that slidably engage both shank and receiver surfaces to provide compound articulation between the receiver and the shank. The receiver includes inwardly directed spring tabs engaging the insert and prohibiting rotation of the insert within the receiver.

Claims (35)

1. A polyaxial bone screw assembly comprising:

a) a bone screw shank having an upper portion;
b) a receiver having a cavity, the bone screw upper portion receivable in the cavity;

c) a retaining and articulating structure receivable in the cavity between the shank upper portion and the receiver, the retaining and articulating structure being unattached to both the shank and the receiver so as to be able to freely move relative to both the shank and the receiver during positioning of the shank relative to the receiver; and d) a compression insert disposed in the receiver, the insert having a mating surface exclusively frictionally engageable with the bone screw upper portion.
2. The assembly of claim 1 wherein the compression insert mating surface is concave and the bone screw upper portion is convex.
3. The assembly of claim 1 wherein the shank upper portion has a convex surface and the retaining and articulating structure has a concave surface in slidable mating engagement with the convex surface.
4. The assembly of claim 3 wherein the concave and convex surfaces are substantially spherical.
5. The assembly of claim 1 wherein the retaining and articulating structure has a convex surface and the receiver has a concave surface in slidable mating engagement with the convex surface.
6. The assembly of claim 5 wherein the concave and convex surfaces are substantially spherical.
7. The assembly of claim 1 wherein the shank upper portion has a tool engagement formation formed thereon adapted for non-slip engagement by a tool for driving the bone screw shank into bone.
8. The assembly of claim 7 wherein the tool engagement formation is a substantially hex shaped inner drive.
9. The assembly of claim 1 wherein the retaining and articulating structure is sized and shaped to be at least one of top-loadable and bottom-loadable into the receiver.
10. The assembly of claim 1 wherein the retaining and articulating structure further comprises first and second spaced ends, the retaining and articulating structure being compressible and expandible with the first and second ends being movable toward and away from one another.
11. The assembly of claim 10 wherein the retaining and articulating structure has a central axis, the first and second ends each being substantially planar surfaces running substantially parallel to the axis.
12. The assembly of claim 10 wherein the retaining and articulating structure has a central axis, the first and second ends each being substantially planar surfaces running at an angle oblique to the axis.
13. The assembly of claim 1 wherein the bone screw shank is cannulated.
14. The assembly of claim 1 wherein the bone screw shank has a body for fixation to bone, the shank body being integral with the shank upper portion and further comprising a closure structure insertable into the receiver, the closure structure for operably urging the insert into frictional engagement with the bone screw shank upper portion and moving the shank in a direction to frictionally lock the position of the retaining and articulating structure with respect to the shank upper portion and the receiver, thereby locking the shank body in a selected angle with respect to the receiver.
15. The assembly of claim 14 wherein:

(a) the receiver has upstanding spaced arms defining an open channel, the arms having guide and advancement structures on an inside surface thereof; and (b) the closure structure is sized and shaped to be positionable between the arms for closing the channel, the closure structure having a closure guide and advancement structure for rotatably mating with the guide and advancement structures on the arms, biasing the closure structure upon advancement rotation against a longitudinal connecting member disposed in the channel.
16. The assembly of claim 1 further comprising resilient structure extending from the receiver and biasing against the compression insert at a depression formed in a surface of the insert, the resilient structure prohibiting rotational movement of the compression insert within the receiver.
17. The assembly of claim 16 wherein the resilient structure is a pair of opposed spring tabs attached to the receiver and extending toward a central axis of the receiver.
18. The assembly of claim 16 wherein the insert depression is a shallow groove.
19. The assembly of claim 16 wherein the insert depression is a flat surface.
20. The assembly of claim 17 wherein the spring tabs are integral with the receiver.
21. The assembly of claim 17 wherein the spring tabs are directed upwardly toward a top opening of the receiver.
22. The assembly of claim 17 wherein the spring tabs are directed downwardly toward a base of the receiver.
23. The assembly of claim 1 wherein the insert is one of top and bottom loaded.
24. In a polyaxial bone screw assembly for surgical implantation and including a shank and a threaded body for inserting into a bone and a receiver having a channel for receiving a longitudinal connecting member within the channel, the improvement wherein a) the shank has a first curvate surface at an upper end thereof; and further comprising:

b) an articulation structure located between the shank upper end and the receiver, the articulation structure having a second curvate surface and an opposed third curvate surface, the articulation structure being in slidable engagement with receiver at the second curvate surface, the articulation structure third curvate surface being in slidable engagement with the shank upper end first curvate surface;
and c) a compression insert having a fourth curvate surface in slidable engagement with the shank first curvate surface.
25. The improvement of claim 24 wherein the shank upper end has a tool engagement formation formed thereon adapted for non-slip engagement by a tool for driving the bone screw shank into bone.
26. The improvement of claim 24 wherein the articulation structure is sized and shaped to be at least one of top-loadable and bottom-loadable into the receiver.
27. The improvement of claim 24 wherein the articulation structure further comprises first and second spaced ends, the articulation structure being compressible and expandible with the first and second ends being movable toward and away from one another.
28. The improvement of claim 24 further comprising resilient structure extending from the receiver and biasing against the compression insert at a depression formed in an outer surface of the insert, the resilient structure prohibiting rotational movement of the compression insert within the receiver.
29. The improvement of claim 28 wherein the resilient structure is a pair of opposed spring tabs integral with the receiver and extending toward a central axis of the receiver.
30. The improvement of claim 24 further comprising deformable structure extending from the receiver toward a central axis of the receiver, the deformable structure blocking upward movement of the compression insert.
31. In a bone screw assembly having a receiver pivotally connected to a bone screw shank, the receiver having an opening for receiving a longitudinal connecting member and a compression insert disposed in the receiver for frictional engagement with the longitudinal connection member, the improvement comprising:

a) resilient structure extending from the receiver and biasing against the compression insert at a depression formed in a surface of the insert, the resilient structure prohibiting rotational movement of the compression insert within the receiver; and b) an articulation structure disposed between the bone screw shank and the receiver, the articulation structure having a first curvate wall in sliding engagement with the receiver and a second curvate wall in sliding engagement with the bone screw shank.
32. The improvement of claim 31 wherein the resilient structure is a pair of opposed spring tabs attached to the receiver and extending toward a central axis of the receiver.
33. The improvement of claim 31 wherein the insert depression is a shallow groove.
34. The improvement of claim 31 wherein the insert depression is a flat surface.
35. The improvement of claim 31 wherein the articulation structure further comprises first and second spaced ends, the articulation structure being compressible and expandible with the first and second ends being movable toward and away from one another.
CA2677403A 2007-03-07 2008-03-06 Polyaxial bone screw with spherical capture, compression insert and alignment and retention structures Expired - Fee Related CA2677403C (en)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
US90547207P 2007-03-07 2007-03-07
US60/905,472 2007-03-07
US12/072,354 2008-02-26
US12/072,354 US10076361B2 (en) 2005-02-22 2008-02-26 Polyaxial bone screw with spherical capture, compression and alignment and retention structures
PCT/US2008/002942 WO2008112114A1 (en) 2007-03-07 2008-03-06 Poly axial bone screw with spherical capture, compression insert and alignment and retention structures

Publications (2)

Publication Number Publication Date
CA2677403A1 true CA2677403A1 (en) 2008-09-18
CA2677403C CA2677403C (en) 2011-11-22

Family

ID=39759811

Family Applications (1)

Application Number Title Priority Date Filing Date
CA2677403A Expired - Fee Related CA2677403C (en) 2007-03-07 2008-03-06 Polyaxial bone screw with spherical capture, compression insert and alignment and retention structures

Country Status (6)

Country Link
US (6) US10076361B2 (en)
EP (1) EP2129310B1 (en)
JP (2) JP2010520024A (en)
AU (1) AU2008226963B2 (en)
CA (1) CA2677403C (en)
WO (1) WO2008112114A1 (en)

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US20160324543A1 (en) 2016-11-10
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US11627996B2 (en) 2023-04-18
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US20130274815A9 (en) 2013-10-17
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US20120310290A1 (en) 2012-12-06
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