CA2614898C - Mono-planar pedilcle screw method, system, and kit - Google Patents

Mono-planar pedilcle screw method, system, and kit Download PDF

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Publication number
CA2614898C
CA2614898C CA2614898A CA2614898A CA2614898C CA 2614898 C CA2614898 C CA 2614898C CA 2614898 A CA2614898 A CA 2614898A CA 2614898 A CA2614898 A CA 2614898A CA 2614898 C CA2614898 C CA 2614898C
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CA
Canada
Prior art keywords
screw
rod
channel
bone anchor
anchor assembly
Prior art date
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Active
Application number
CA2614898A
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French (fr)
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CA2614898A1 (en
Inventor
James Marino
Jamil Elbanna
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Trinity Orthopedics LLC
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Trinity Orthopedics LLC
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Publication of CA2614898A1 publication Critical patent/CA2614898A1/en
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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
    • 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
    • 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
    • A61B17/7038—Screws or hooks, wherein a rod-clamping part and a bone-anchoring part can pivot relative to each other to a different extent in different directions, e.g. within one plane only
    • 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

Abstract

A pedicle screw assembly (10) that includes a cannulated pedicle screw (20) having a scalloped shank (24), a swivel top head 30 having inclined female threads (44) in a left and right arm (34, 36) to prevent splaying, a set screw (50) having mating male threads 52, a rod conforming washer (60) that is rotatably coupled to the set screw (50), the conforming washer including reduced ends to induce a coupled rod (80) to bend. A rod reduction system including an inner and an outer cannula (90, 100), the inner cannula (90) including a left and right arm (92, 94) that engage the swivel top head's (30) left and right arm (34, 36) and the outer cannula (100) dimensioned to securely slide over the inner cannula (90) to reduce the rod (80) into the swivel top head's (30) rod receiving area (38).

Description

MONO-PLANAR PEDICLE SCREW METHOD, SYSTEM, AND KIT
BACKGROUND
1. Field of the Invention 002 The invention relates generally to orthopedic boney fixation systems and methods, and more particularly, to facet fixation systems and methods.
2. Description of Related Art 003 Some pedicle screw systems include a bone screw coupled to a rod receiving component or head. In these systems the screw may be moveable angularly relative to the rod receiving head prior to rod lock down. Such systems typically provide limited angular movement between the screw and rod receiving head. It is desirable to provide an easy to use and install pedicle screw system and a system that enables less limited angular movement between the screw and the rod receiving head. The present invention provides such a system and method.
SUMMARY OF THE INVENTION
004 The present invention includes a pedicle screw assembly (10) that includes a cannulated pedicle screw (20) having a scalloped shank (24), a swivel top head 30 having inclined female threads (44) in a left and right arm (34, 36) to prevent splaying, a set screw (50) having mating male threads 52, a rod conforming washer (60) that is rotatably coupled to the set screw (50), the conforming washer including reduced ends to induce a coupled rod (80) to bend. The present invention also includes a rod reduction system including an inner and an outer cannula (90, 100), the inner cannula (90) including a left and right arm (92, 94) that engage the swivel top head's (30) left and right arm (34, 36) and the outer cannula (100) dimensioned to securely slide over the inner cannula (90) to reduce the rod (80) into the swivel top head's (30) rod receiving area (38).

005 In an embodiment the screw shank includes a predetermined number of scallops where each scallop is shaped to engage a rod. In this embodiment the position of the swivel top head to the screw has a predetermined number of locations based on the number of scallops.
005a In accordance with one aspect of the invention there is provided a bone anchor assembly. The assembly includes a screw having a shaft extending from a proximal end to a distal end and a plurality of threads on at least a portion of the shaft.
The assembly also includes a receiving element including a rod receiving section including a left arm and a right arm extending proximally forming a first channel for receiving a rod therethrough, wherein the first channel has a first channel plane aligned with a longitudinal axis of the rod extending through the first channel, and a screw receiving section having a first arm and a second arm extending distally forming a second channel configured to receive the screw, wherein the second channel has a second channel plane offset from the first channel plane. The screw is adapted to articulate relative to the receiving element along the second channel plane and is prevented from articulating relative to the receiving element along the first channel plane.
005b The first channel plane may be at a right angle to the second channel plane.
005c The screw may be adapted to articulate relative to the receiving element only along a plane that intersects and is non-parallel to the first channel plane.
005d The first channel plane may define the sagittal plane or parasagittal plane.
005e The bone anchor assembly may further include an axle configured to insert through an aperture extending through the screw proximal end and through opposing apertures extending through each of the first arm and second arm of the screw-receiving section to rotatably couple the screw to the receiving element, wherein the screw may pivot about the axle.

2a 005f The screw proximal end may include two approximately flat, opposing walls forming a leading edge and may be sized to fit within the second channel.
005g The leading edge of the screw proximal end may include one or more concave surfaces.
005h The bone anchor assembly may further include the rod extending through the first channel.
0051 The receiving element may further include an internal bore extending between the first channel and the second channel, such that the rod engages the leading edge of the screw proximal end.
005j The rod may have a substantially uniform convex cross sectional shape complementary to at least one of the one or more concave surfaces.
005k The bone anchor assembly may further include a compression element adapted to move distally within the internal bore of the receiving element to transmit a compression force on the rod positioned in the first channel toward the proximal end of the screw. , 0051 The screw may be prevented from articulating along the first channel plane both prior to and after compressed association of the rod with the proximal end of the screw.
005m The screw may be adapted to articulate relative to the receiving element only along a plane that intersects and may be non parallel to the first channel plane both prior to and after compressed association of the rod with the proximal end of the screw.
005n The bone anchor assembly may further include a washer dimensioned to fit within the first channel and positioned above the rod extending through the first channel.

2b 005o The washer may be rotatably coupled to the compression element.
005p The compression element may include a chamber within which a proximal portion of the washer resides.
005q The washer may have a lower mating surface that interdigitates with at least one surface feature of the rod.
005r The bone anchor assembly may further include a connecting rod element extending through the rod-receiving section of the receiving element and may be positioned superior to the proximal end of the screw and may further include a compressive element positioned within the receiving element superior to the connecting rod. The compressive element and proximal end of the screw each may have mating surfaces that interdigitate with complementary mating surfaces of the connecting rod element.
005s The left and right arms may further include external channels configured for mating with a rod reduction tool.
005t The external channels may have have undercut features that permit locking of the rod reduction tool within the external channels.
BRIEF DESCRIPTION OF THE DRAWINGS
006 The features, objects, and advantages of the present invention will become more apparent from the detailed description set forth below when taken in conjunction with the drawings in which like reference characters identify correspondingly throughout and wherein:
007 FIGURE lA is an isometric view of a pedicle screw assembly in accordance with the present invention.
008 FIGURE 1B is an exploded, isometric view of the pedicle screw assembly shown in FIGURE 1A.
009 FIGURE 2A is a side view of the pedicle screw assembly shown in FIGURE 1A.
010 FIGURE 2B is a sectional view of the pedicle screw assembly shown in FIGURE 2A
along line AA.
011 FIGURE 2C is a top view of the pedicle screw assembly shown in FIGURE 1A.
012 FIGURE 3A is a front view of the pedicle screw assembly shown in FIGURE 1A.
013 FIGURE 3B is a sectional view of the pedicle screw assembly shown in along line BB.
014 FIGURE 4A is a partial section view of the pedicle screw assembly shown in FIGURE
lA showing swivel head oriented 30 degrees offset from the longitudinal axis of the screw.
015 FIGURE 4B is a partial section view of the pedicle screw assembly shown in FIGURE
1A showing swivel head oriented 60 degrees offset from the longitudinal axis of the screw.
016 FIGURE 5A is an isometric view of a pedicle screw according to an assembly embodiment of the present invention shown in FIGURE 1A.
017 FIGURE 5B is a side view of the pedicle screw shown in FIGURE
5A.
018 FIGURE 5C is a top view of the pedicle screw shown in FIGURE
5A.
019 FIGURE 5D is a sectional view of the pedicle screw shown in FIGURE 5B
along line AA.
020 FIGURE 5E is a detailed view of the segment B of the sectional pedicle screw shown in FIGURE 5D.
021 FIGURE 6A is a side view of a swivel top head according to an assembly embodiment of the present invention shown in FIGURE 1A.
022 FIGURE 6B is a sectional view of the swivel top head shown in FIGURE 6A
along line AA.
023 FIGURE 6C is a top view of the swivel top head shown in FIGURE
6A.
024 FIGURE 7A is a front view of a swivel top head according to an assembly embodiment of the present invention shown in FIGURE 1A.
025 FIGURE 7B is a sectional view of the swivel top head shown in FIGURE 7A
along line BB.
026 FIGURE 7C is a sectional view of the detail area C of swivel top head shown in FIGURE 7B.
027 FIGURE 8A is a side view of a set screw according to an assembly embodiment of the present invention shown in FIGURE 1A.
028 FIGURE 8B is a sectional view of the set screw shown in FIGURE
8A along line AA.
029 FIGURE 8C is a sectional view of the detail area B of the set screw shown in FIGURE
8B.
030 FIGURE 8D is a partial, sectional view of the set screw shown in FIGURE 8A.
031 FIGURE 8E is a top view of the set screw shown in FIGURE 8A.
032 FIGURE 9A is an end view of a conforming washer according to an assembly embodiment of the present invention shown in FIGURE 1A.
033 FIGURE 9B is a sectional view of the conforming washer shown in FIGURE 9A along line AA.
034 FIGURE 9C is a bottom view of the conforming washer shown in FIGURE 9A.

035 FIGURE 10A is a side view of a stepped axel according to an assembly embodiment of the present invention shown in FIGURE 1A.
036 FIGURE 10B is an end view of the stepped axel shown in FIGURE 10B.
037 FIGURE 11A is a sectional view of a rod reduction system engaged to a swivel head 5 of the assembly shown in FIGURE lA prior to reduction of the rod into the swivel head's rod receiving area.
038 FIGURE 11B is another sectional view of the rod reduction system engaged to a swivel head shown in FIGURE 11B after reduction of the rod into the swivel head's rod receiving area.
DETAILED DESCRIPTION

Throughout this description, embodiments and variations are described for the purpose of illustrating uses and implementations of the invention. The illustrative description should be understood as presenting examples of the invention, rather than as limiting the scope of the invention.

FIGURE 1 A is an isometric view of a pedicle screw assembly 10 in accordance with the present invention. FIGURE 1B is an exploded, isometric view of the pedicle screw assembly shown in FIGURE 1A.The pedicle screw assembly 10 includes a pedicle screw 20, a swivel top head 30, a set screw 50, a conforming washer 60, and a stepped axel 7p.
The swivel top head 30 is coupled the screw 20 via the stepped axel 70. In one embodiment the conforming washer is rotatably coupled to the set screw 50.

FIGURE 2A is a side view of the pedicle screw assembly 10 shown in FIGURE 1A, FIGURE 2B is a sectional view of the pedicle screw assembly 10 shown in FIGURE
2A along line AA, and FIGURE 2C is a top view of the pedicle screw assembly 10 shown in FIGURE 1A.
As shown in FIGURE 2B, the pedicle screw 20 may be cannulated 22. In a process employing the pedicle screw 20, a guide wire (not shown) may first be securely placed in a pedicle. Then the pedicle screw assembly 10 without the set screw 50 and conforming washer 60 pair may be inserted over the guide wire to the pedicle via the cannulation 22. The screw 20 may then be advanced into the pedicle boney process and the guide wire removed from the pedicle bony process via the cannulation 22.

FIGURE 3A is a front view of the pedicle screw assembly 10 shown in FIGURE IA
and FIGURE 3B is a sectional view of the pedicle screw assembly shown in FIGURE 3A along line BB. As shown in FIGURE 3B the stepped axel 70 extends through the pedicle screw 20 into the swivel top head 30. FIGURE 3B also shows the conforming washing integrated within the set screw 50. As noted in one embodiment, the conforming washer 60 is rotatably integrated or coupled to the set screw 50.

FIGURE 4A is a partial sectional view of the pedicle screw assembly 10 shown in FIGURE 1 A showing the swivel head 30 oriented 30 degrees offset from the longitudinal axis of the screw 20 along a single plane, mono-planar relative to the screw axis.
FIGURE 4B is a partial sectional view of the pedicle screw assembly 10 shown in FIGURE lA showing the swivel head 30 oriented 60 degrees offset from the longitudinal axis of the screw 20. As shown in FIGURES
4A and 4B, the pedicle screw 20 may have a scalloped shank 24 having a predetermined number of scallops. The scallops may have a concave shape to engage a rounded rod 80 (see FIGURE
11A). In other embodiments the scallops may have different shapes as a function of the rod shape 80. After the screw 20 is advanced into a pedicle boney process a rod 80 may be inserted into the swivel head 30. Once the desired orientation between the screw 20 and swivel head 30 is achieved, the set screw 50 and conforming washer 60 may be inserted to compress the rod 80 against a scallop 24 of the screw 20 to maintain the desired orientation.

FIGURE 5A is an isometric view of a pedicle screw 20 according to an assembly embodiment of the present invention shown in FIGURE 1A. FIGURE 5B is a side view of the pedicle screw 20 shown in FIGURE 5A. FIGURE 5C is a top view of the pedicle screw 20 shown in FIGURE 5A. FIGURE 5D is a sectional view of the pedicle screw 20 shown in FIGURE 5B along line AA. The pedicle screw 20 includes screw cannulation 22, plurality of scallops 24, threads, shank axel carmulation 28, and tip 29. As shown in FIGURE 5B, the screw tip 29 may be have a chamfer of about 60 degrees. In one process after a guide wire is securely inserted into a pedicle boney process a cannulated screw tap (not shown) may be inserted over the guide wire. The cannulated screw tap may then be used to create a tap within the pedicle honey process. The screw 20 includes the chamfered tip 29 to aid insertion into the tapped pedicle boney process. In one embodiment the screw 20 is inserted in a minimally invasive process so a practitioner may not be able to visual orient the screw within the formed 20 pedicle tap.

FIGURES 5B, 5C, and 5D also include some dimensions. It is noted that the pedicle screw assembly 10 may work with screws 20 having different length and radii as a function of patient anatomy. In addition, the scallop dimensions and shape may vary as a function of the rod 80 to be employed with the pedicle screw assembly. In one embodiment the pedicle screw = assembly consists primarily of titanium. FIGURE 5E is a detailed view of the segment B (threads 26) of the sectional pedicle screw 20 shown in FIGURE 5D. The thread pattern 26 is one embodiment in accordance with the present invention and the dimensions are also according to one embodiment in accordance with the present invention.

FIGURE 6A is a side view of a swivel top head 30 according to an assembly embodiment of the present invention shown in FIGURE 1A. FIGURE 6B is a sectional view of the swivel top head 30 shown in FIGURE 6A along line AA. FIGURE 6C is a top view of the swivel top head 30 shown in FIGURE 6A.The swivel top head 30 includes a head axel cannulation 32, left head arm 34, right head arm 36, head receiving channel 38, head rod seating area 42, female thread 44, and screw 20 shank receiving area 46. The left head arm 34 and right head arm 36 each include the female thread 44. FIGURES 6B and 6C include dimensions for one embodiment of a swivel top head 30 in accordance with the present invention.
047 FIGURE 7A is a front view of a swivel top head 30 according to an assembly embodiment 10 of the present invention shown in FIGURE lA and FIGURE 7B is a sectional view of the swivel top head 30 shown in FIGURE 7A along line BB. FIGURES 7A
and 7B
include dimensions for one embodiment of a swivel top head 30 in accordance with the present invention. As shown in FIGURE 7A the swivel top head 30 includes a head axel cannulation offset 48.

FIGURE 7C is a sectional view of the detail area C of swivel top head 30 female thread 44 shown in FIGURE 7B. The thread 44 includes a female thread lower rail 43 and a female thread upper, rail. FIGURE 7C includes dimensions for one embodiment of a female thread 44 for a swivel top head 30 in accordance with the present invention.
As shown in FIGURE 7C, the thread rails 43 and 45 are upwardly inclined. In a process where the set screw 50 is inserted into the left and right arms, the thread pattern 44 will prevent splaying of the arms 34 and 36.

FIGURE 8A is a side view of a set screw 50 according to an assembly embodiment of the present invention shown in FIGURE 1A. FIGURE 8B is a sectional view of the set screw 50 shown in FIGURE 8A along line AA. FIGURE 8C is a sectional view of the detail area B of the set screw 50 shown in FIGURE 8B. FIGURE 8D is a partial, sectional view of the set screw 50 shown in FIGURE 8A. FIGURE 8E is a top view of the set screw 50 shown in FIGURE 8A.
FIGURES 8B and 8C include dimensions for one embodiment of a set screw 50 in accordance with the present invention. The set screw 50 includes a thread 52, conforming washer head receiving chamber 56, and set screw hexagonal key 58. The male thread 52 includes lower edge 51 and upper edge 54. The thread 52 is dimensioned to match with the female thread 44 to engage the arms 34 and 36 and prevent or limit splaying of the arms 34 and 36.
The receiving chamber 56 may also include a receiving chamber edge 57.

FIGURE 9A is an end view of a conforming washer 60 according to an assembly embodiment of the present invention shown in FIGURE 1A. FIGURE 9B is a sectional view of the conforming washer 60 shown in FIGURE 9A along line AA. FIGURE 9C is a bottom view of the conforming washer 60 shown in FIGURE 9A. FIGURES 9A, 9B, and 9C include dimensions for one embodiment of a conforming washer 60 in accordance with the present invention. The conforming washer 60 includes a washer head 62, washer head enlarged cap 63, rod conforming section 64, and rod conforming section reduced ends 65. The washer head 62 is dimensioned to be inserted into the washer head receiving chamber 56. The head enlarged cap 63 is dimensioned to prevent the conforming washer from being disengaged from the set screw 50 upon insertion into the set screw's receiving chamber 56 while enabling the set screw 50 to be rotated independently of the conforming washer 60.

In one embodiment the rod conforming section 64 includes reduced ends 65 that cause the conforming washer 60 bend a rod 80 when the set screw 50 compresses the conforming washer against the rod 80 (and screw shank scallops 24). In one embodiment the conforming washer 60 helps the rod 80 meet the natural lordosis of one or more vertebrae (not shown) that the rod 80 may be coupled thereto via the pedicle screw assembly 10.

FIGURE 10A is a side view of a stepped axel 70 according to an assembly embodiment 10 of the present invention shown in FIGURE 1A. FIGURE 10B is an end view of the stepped axel 70 shown in FIGURE 10B. FIGURES 10A includes dimensions for one embodiment of a stepped axel 70 in accordance with the present invention. The stepped axel 70 includes an axel first section 72, an axel second section 74, an axel first section leading edge 76, and an axel second section edge 78. The stepped axel 70 is dimensioned to engage the swivel top head 30 shank receiving area while permitting the pedicle screw 20 to rotate freely thereabout via its shank axel cannulation 28.

FIGURE 11A is a sectional view of a rod reduction system 110 engaged to a swivel head 30 of the assembly 10 shown in FIGURE lA prior to reduction of the rod 80 into the swivel head's rod receiving area 38. The rod reduction system 110 includes head engaging cannula 90 and reduction cannula 100. The head engaging cannula 90 includes first arm 94 and a second arm 96. In a process, the cannula 90 may be placed over the rod 80 after the swivel top head 30 with pedicle screw 20 is inserted in a pedicle boney process. The cannula 90's left and right arm 92 and 94 engage the swivel top head's 30 left and right aim 34 and 36. The cannula 90 is open between its arms 92 and 94. In a rod reduction process the cannula 100 is advanced over the cannula 90 to engage the rod 80 and reduce the rod into the swivel top head's 30 rod receiving area 38. In the embodiment, the cannula 100 is dimensioned to slide securely over the cannula 90. FIGURE 11B is another sectional view of the rod reduction system 110 where the cannula 90 is engaged to the swivel top head 30 and the rod has been reduced into the swivel top head 30 via the advancement of the cannula 100 over the cannula 90.
054 While specific embodiments of the invention have been described and illustrated, such embodiments should be considered illustrative of the invention only and not as limiting the invention as construed in accordance with the accompanying claims.

Claims (20)

1. A bone anchor assembly, the assembly comprising:
a screw having a shaft extending from a proximal end to a distal end and a plurality of threads on at least a portion of the shaft; and a receiving element comprising:
a rod receiving section including a left arm and a right arm extending proximally forming a first channel for receiving a rod therethrough, wherein the first channel has a first channel plane aligned with a longitudinal axis of the rod extending through the first channel; and a screw receiving section having a first arm and a second arm extending distally forming a second channel configured to receive the screw, wherein the second channel has a second channel plane offset from the first channel plane, and wherein the screw is adapted to articulate relative to the receiving element along the second channel plane and is prevented from articulating relative to the receiving element along the first channel plane.
2. The bone anchor assembly of claim 1, wherein the first channel plane is at a right angle to the second channel plane.
3. The bone anchor assembly of claim 1, wherein the screw is adapted to articulate relative to the receiving element only along a plane that intersects and is non-parallel to the first channel plane.
4. The bone anchor assembly of claim 1, wherein the first channel plane defines the sagittal plane or parasagittal plane.
5. The bone anchor assembly of claim 1, further comprising an axle configured to insert through an aperture extending through the screw proximal end and through opposing apertures extending through each of the first arm and second arm of the screw-receiving section to rotatably couple the screw to the receiving element, wherein the screw pivots about the axle.
6. The bone anchor assembly of claim 1, wherein the screw proximal end comprises two approximately flat, opposing walls forming a leading edge and sized to fit within the second channel.
7. The bone anchor assembly of claim 6, wherein the leading edge of the screw proximal end comprises one or more concave surfaces.
8. The bone anchor assembly of claim 7, further comprising the rod extending through the first channel.
9. The bone anchor assembly of claim 8, wherein the receiving element further comprises an internal bore extending between the first channel and the second channel such that the rod engages the leading edge of the screw proximal end.
10. The bone anchor assembly of claim 9, wherein the rod has a substantially uniform convex cross sectional shape complementary to at least one of the one or more concave surfaces.
11. The bone anchor assembly of claim 9, further comprising a compression element adapted to move distally within the internal bore of the receiving element to transmit a compression force on the rod positioned in the first channel toward the proximal end of the screw.
12. The bone anchor assembly of claim 11, wherein the screw is prevented from articulating along the first channel plane both prior to and after compressed association of the rod with the proximal end of the screw.
13. The bone anchor assembly of claim 11, wherein the screw is adapted to articulate relative to the receiving element only along a plane that intersects and is non parallel to the first channel plane both prior to and after compressed association of the rod with the proximal end of the screw.
14. The bone anchor assembly of claim 11, further comprising a washer dimensioned to fit within the first channel and positioned above the rod extending through the first channel.
15. The bone anchor assembly of claim 14, wherein the washer is rotatably coupled to the compression element.
16. The bone anchor assembly of claim 14, wherein the compression element comprises a chamber within which a proximal portion of the washer resides.
17. The bone anchor assembly of claim 14, wherein the washer has a lower mating surface that interdigitates with at least one surface feature of the rod.
18. The bone anchor assembly of claim 1, further comprising a connecting rod element extending through the rod-receiving section of the receiving element and positioned superior to the proximal end of the screw and further comprising a compressive element positioned within the receiving element superior to the connecting rod, wherein the compressive element and proximal end of the screw each have mating surfaces that interdigitate with complementary mating surfaces of the connecting rod element.
19. The bone anchor assembly of claim 1, wherein the left and right arms further comprise external channels configured for mating with a rod reduction tool.
20. The bone anchor assembly of claim 19, wherein the external channels have undercut features that permit locking of the rod reduction tool within the external channels.
CA2614898A 2005-04-27 2006-04-27 Mono-planar pedilcle screw method, system, and kit Active CA2614898C (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US67574205P 2005-04-27 2005-04-27
US60/675,742 2005-04-27
PCT/US2006/016042 WO2006116606A2 (en) 2005-04-27 2006-04-27 Mono-planar pedilcle screw method, system, and kit

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CA2614898A1 CA2614898A1 (en) 2006-11-02
CA2614898C true CA2614898C (en) 2014-04-22

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US (2) US7780706B2 (en)
EP (1) EP1876975A2 (en)
CA (1) CA2614898C (en)
WO (1) WO2006116606A2 (en)

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US7833250B2 (en) 2004-11-10 2010-11-16 Jackson Roger P Polyaxial bone screw with helically wound capture connection
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US20100298890A1 (en) 2010-11-25
US20080234759A1 (en) 2008-09-25
EP1876975A2 (en) 2008-01-16
WO2006116606A2 (en) 2006-11-02
US7780706B2 (en) 2010-08-24
WO2006116606A3 (en) 2009-04-16
US8298268B2 (en) 2012-10-30
CA2614898A1 (en) 2006-11-02

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