WO1999005968A1 - Polyaxial locking plate - Google Patents

Polyaxial locking plate Download PDF

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Publication number
WO1999005968A1
WO1999005968A1 PCT/US1998/014444 US9814444W WO9905968A1 WO 1999005968 A1 WO1999005968 A1 WO 1999005968A1 US 9814444 W US9814444 W US 9814444W WO 9905968 A1 WO9905968 A1 WO 9905968A1
Authority
WO
WIPO (PCT)
Prior art keywords
bushing
plate
bone
threads
locking plate
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.)
Ceased
Application number
PCT/US1998/014444
Other languages
English (en)
French (fr)
Inventor
Frank S. Bono
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.)
DePuy Spine LLC
DePuy Orthopaedics Inc
Original Assignee
DePuy Orthopaedics Inc
DePuy Acromed Inc
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 DePuy Orthopaedics Inc, DePuy Acromed Inc filed Critical DePuy Orthopaedics Inc
Priority to KR1020007000950A priority Critical patent/KR20010022371A/ko
Priority to DE69839122T priority patent/DE69839122T2/de
Priority to JP2000504791A priority patent/JP4149130B2/ja
Priority to AU83976/98A priority patent/AU741780B2/en
Priority to EP98934463A priority patent/EP1005290B1/en
Publication of WO1999005968A1 publication Critical patent/WO1999005968A1/en
Anticipated expiration legal-status Critical
Priority to AU2006252101A priority patent/AU2006252101B8/en
Ceased 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
    • 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 or setting implements
    • 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
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods
    • 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 or setting implements
    • 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, e.g. 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
    • 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 or setting implements
    • 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
    • A61B17/863—Shanks, i.e. parts contacting bone tissue with thread interrupted or changing its form along shank, other than constant taper
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods
    • A61B17/16—Instruments for performing osteoclasis; Drills or chisels for bones; Trepans
    • A61B17/17—Guides or aligning means for drills, mills, pins or wires
    • A61B17/1728—Guides or aligning means for drills, mills, pins or wires for holes for bone plates or plate screws
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods
    • A61B17/16—Instruments for performing osteoclasis; Drills or chisels for bones; Trepans
    • A61B17/17—Guides or aligning means for drills, mills, pins or wires
    • A61B17/1739—Guides or aligning means for drills, mills, pins or wires specially adapted for particular parts of the body
    • A61B17/1757—Guides or aligning means for drills, mills, pins or wires specially adapted for particular parts of the body for the spine
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods
    • 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 or setting implements
    • 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
    • A61B17/8052—Cortical plates, i.e. bone plates; Instruments for holding or positioning cortical plates, or for compressing bones attached to cortical plates immobilised relative to screws by interlocking form of the heads and plate holes, e.g. conical or threaded
    • A61B17/8057—Cortical plates, i.e. bone plates; Instruments for holding or positioning cortical plates, or for compressing bones attached to cortical plates immobilised relative to screws by interlocking form of the heads and plate holes, e.g. conical or threaded the interlocking form comprising a thread

Definitions

  • the present invention relates to a bone locking plate, more particularly the present invention relates to a bone locking plate that includes an adjustable attachment component. Most particularly, the present invention relates to a bone locking plate that includes an attachment component whose angle relative to the locking plate may be manipulated during surgery so that it extends into the bone in a desirable orientation.
  • the spinal column includes over twenty bones that are coupled together. These bones are capable of twisting and curving in a variety of directions relative to one another. Traumas and developmental irregularities can result, however, in spinal pathologies for which permanent immobilization of multiple vertebrae in the spinal column is required. It is known to place a bone screw through a bone plate along an axis that has been selected by the manufacturer of the plate. See for example U.S.
  • Patent No 5,364,399 entitled “Anterior Cervical Plating System", to Lowery et al.
  • U.S. Patent No. 4,484,570 entitled “Device Comprising an Implant and Screws for Fastening Said Implant to a Bone, and a Device for Connecting Two Separated Pieces of Bone", to Sutter et al. Since bone screws are known to pull out of the bone over time, these conventional bone plates have main bone-plate screws that lock down using additional loose components that either cover adjacent screws or are threaded into the head/shaft of the bone screw to prevent the screws from backing out of the bone.
  • a locking plate apparatus suitable for engagement with a bone.
  • the locking apparatus includes a plate with a body portion and an internal wall defining a plate hole therethrough and an expandable bushing including a radially exterior surface and an opposite interior surface defining a passageway.
  • the exterior surface of the bushing is sized to permit rotation of the bushing about a plurality of axes within the plate hole.
  • the locking apparatus includes an attachment component with a leading portion sized for extension through the passageway and into the bone and an opposite leading portion sized to press the bushing against the internal wall of the plate to form a friction lock between the bushing and the plate.
  • a locking plate apparatus is provided that is suitable for attachment with a bone.
  • the locking plate apparatus includes a plate that has a proximal surface, a distal surface, and an internal wall that defines a plate hole extending between the proximal and distal surfaces, an expandable bushing, and an attachment component sized for extension through the bushing.
  • the bushing includes a radially exterior surface and an opposite interior surface defining a passageway The exterior surface is sized for insertion into the plate hole of the plate and for engagement with the internal wall to couple movably the bushing to the plate.
  • the attachment component includes a leading portion and an opposite leading portion. The leading portion has a tapered portion that diverges away from the leading portion and is sized for pressing the bushing toward the internal wall of the plate to form a friction lock between the bushing and the plate.
  • a method for coupling two bone portions together includes the steps of providing a locking apparatus that includes a plate having a body portion and an internal wall defining at least two plate holes through the body portion, at least two expandable bushings press fit into the respective plate holes each having a radially exterior surface and an opposite interior surface and a first end and an opposite second end defining a passageway therebetween and at least two attachment components being sized for extension into the passageway, each attachment component including opposite leading and trailing portions.
  • the method includes the steps of positioning the body portion upon the bone portions so that the plate holes in the plate are situated over bone, rotating at least one of the bushings within the plate hole about a plurality of axes until the first and second ends of the bushing are aligned along an axis that extends through a pre-determined portion of the bone. Further, the method includes the steps of inserting the leading portion of one attachment component through each passageway and driving the trailing portion of each attachment component through the respective passageway until the leading portion is positioned in the bone and the exterior surface of the bushing is pressed against the internal wall of the plate to form a friction lock therebetween.
  • a bone fixation apparatus in yet another embodiment, includes a plate with a plate hole through the plate, a bone fixation screw for extension through the plate hole and into a bone, and an expansion bushing carried in the plate hole.
  • the bushing is threaded to engage the screw and expandable by the screw frictionally to lock in position in the plate hole.
  • a plate for bridging between and fixing the relative portions of bones includes plate holes adjacent each bone, each plate hole carrying an expandable bushing therein for swivel movement selectively to position the axis of the bushing relative to the adjacent bone and a bone screw for penetration into the bone and expanding the bushing to lock the bushing in a selected position in the plate.
  • a plate and screw apparatus for orthopaedic applications includes a plate with a plurality of plate holes formed therein, each plate hole having an internal wall, a radially expandable bushing positioned in each plate hole to be held by said internal wall, and a screw for each plate hole, each screw having a leading portion for engaging the bushing and a trailing portion for expanding the bushing into locking engagement with the internal wall.
  • Fig. 1 is a perspective view of a locking apparatus in accordance with the present invention coupled to vertebrae and showing the locking apparatus including a locking plate having six plate holes and corresponding slotted bushings having a threaded passageway therethrough and thread-through bone screws;
  • Fig. 2 is a top view of the locking apparatus of Fig. 1 prior to placement of the bone screws therethrough and showing six bushings press-fit into the six plate holes to form a locking plate/bushing subassembly;
  • Fig. 3 is a cross sectional view taken along lines 3-3 of Fig. 1 showing the bushing having a cylindrically-shaped exterior surface and an interior surface having threads extending into the passageway;
  • Fig. 4 is a top view of the bushing of Fig. 3 showing the bushing including a slot therethrough and showing the slot having a pre-determined dimension prior to extension of the bone screw through the passageway;
  • Fig. 5 is a cross section taken along lines 5-5 of Fig. 1 during attachment of the locking apparatus on the vertebrae, showing each thread-through bone screw including a single lead and multiple lead that tapers in a radially outward direction from the single lead and showing the multiple lead of a first bone screw frictionally coupling the bushing to the locking plate and showing the single lead of a second bone screw engaging the threads positioned within the passageway of the bushing;
  • Fig. 6 is a view similar to Fig.
  • FIG. 5 of an alternative embodiment of the present invention showing a locking apparatus including a locking plate, threaded bushings, and drop-in bone screws that each include a single lead sized for extension through the passageway spaced-apart from the threads of the bushing and a triple lead that presses the bushing against the locking plate frictionally to couple the bushing and the locking plate together;
  • Fig. 7 is a side view of a graft screw, suitable for extending through graft holes in the locking plate; and Fig. 8 is a cross-sectional view of the locking plate/bushing subassembly showing a drill guide extending into the passageway of one of the bushings to manipulate the positioning of the bushing in the plate hole relative to the bone.
  • Fig. 1 illustrates a locking plate apparatus 10 in accordance with the present invention as apparatus 10 appears to a surgeon during attachment of apparatus 10 to vertebrae 11.
  • Locking plate apparatus 10 includes a locking plate 12 and corresponding semi-split donut shaped bushings 16 press-fit into locking plate 12 to form a plate subassembly 17, and thread-through bone screws 18.
  • Locking plate apparatus 10 beneficially enables a surgeon, without a large number of loose pieces, to achieve infinite angulation (3-D) within a specified conical volume while rigidly locking bone screws 18 to rigid locking plate 12.
  • Non-limiting examples of applications of locking plate apparatus 10 include the following: long bone fracture fixation/stabilization, small bone stabilization, lumbar spine as well as thoracic stabilization/fusion and burst fracture fixation, cervical spine compression/fixation, and skull fracture/reconstruction plating.
  • Locking plate 12 includes a rigid body portion 20 having a proximal surface 22 resting upon vertebrae 1 1 and an opposite distal surface 24.
  • body portion 20 includes two walls 23 that define two graft holes 25 and six internal walls 26 that define six spherically shaped plate holes 14. Walls 23 may form graft holes 25 with a cylindrical, spherical shape, or any number of shapes.
  • each plate hole 14 is sized to receive bushing 16 therein to form subassembly 17. It is understood that plate holes 14 can also be elliptical-shaped, teardrop-shaped, or be defined by any number of rounded shapes in accordance with the present invention. Plate holes 14 extend through body portion 20 between proximal and distal surfaces 22, 24.
  • Locking plate 12 may include one, two, four, or five sets of two plate holes, or may be used in conjunction with any number of holes in a variety of plates. Although locking plate 12 is illustrated and described, it is understood that locking plates may be formed in any number of shapes and sizes for varying applications. Locking plate 12 is constructed of a titanium alloy, although it is understood that locking plate 12 may be constructed of titanium, stainless steel, or any number of a wide variety of materials possessing the mechanical properties suitable for coupling bones together.
  • each donut-shaped bushing 16 is sized so that it is press fit into plate hole 14 of locking plate 12 to form subassembly 17.
  • Bushing 16 will withstand pressure that is applied thereto without slipping out from plate holes 14 in locking plate 12. It is understood that while one bushing 16 will be described hereafter, the description applies to all bushings 16.
  • Bushing 16 is constructed of a titanium alloy, although it is understood that bushing may be constructed of titanium, stainless steel, or any number of a wide variety of materials possessing the mechanical properties suitable for frictionally engaging locking plate 12.
  • bushing 16 includes a first end 32 configured to lie adjacent proximal surface 22 and an opposite second end 34 positioned to lie adjacent distal surface 24 of locking plate 12.
  • bushing 16 includes a spherical-shaped radially exterior surface 28 extending between first and second ends 32, 34 and an opposite radially interior surface 30. While bushing 16 is illustrated with a spherically shaped and smooth exterior surface 28, it is understood that exterior surface 28 may be formed in a variety of rounded shapes and sizes to cooperate with internal wall 26 of locking plate 12.
  • radially interior surface 30 defines a passageway 36 that has an initial predetermined diameter 68 at second end 34 and that extends between first and second ends 32, 34 of bushing 16.
  • bushing 16 is formed to include a radial slot 46 that extends between exterior surface 28 and interior surface 30.
  • slot 46 has an initial pre- determined dimension 58. While slot 46 is illustrated and described, it is understood that bushing 16 may include multiple slots, cut-outs or otherwise be constructed to permit expansion of exterior surface 28. Radial expansion of bushing 16 expands slot 46 and presses exterior surface 28 against internal wall 26 for locking engagement between bushing 16 and locking plate 12.
  • Radially interior surface 30 of bushing 16 also includes threads 38 that extend radially inwardly into passageway 36 and define a diameter 72 adjacent to second end 34 therebetween. As shown in Fig.
  • threads 38 taper from second end 34 toward first end 32, as shown by lines 39. Tapered threads 38 converge at an angle of about five degrees to about twenty degrees, more preferably about five degrees to about twelve degrees, and most preferably about six degrees. In addition, threads 38 have a tread pitch that is a multiple lead, with leads that start about 120°. Illustratively, the tapered pitch is a triple lead, although it is understood that the thread pitch, number of leads, and spacing may vary in accordance with the present invention. Referring now to Fig. 2, exterior surface 28 of bushing 16 is positioned to lie within plate hole 14 of body portion 20 and engages internal wall 26.
  • exterior surface 28 is sized to permit angled rotation of bushing 16 within plate hole 14 along a plurality of axes, as shown for example by lines 40, 42, 44. See Fig. 5.
  • bushing 16 may be rotated within plate hole 14 along a plurality of axes so long as passageway 36 extends unobstructed between proximal and distal surfaces 22, 24 of locking plate 12 to permit extension of bone screw 18 therethrough.
  • bushing 16 movably rides in plate hole 14 to form subassembly 17.
  • locking plate 12 has six plate holes 14 and six bushings 16 ride in six bone holes 14 and rotate independently of one another.
  • subassembly 17 couples bone screws 18 therein without additional loose attachment components, providing surgeons an easy to handle locking plate apparatus 10.
  • Bone screw 18 is formed to engage bushing 16 and to fix the relative positioning of bushing 16 in plate hole 14. It is understood that while one bone screw 18 will be described hereafter, the description applies to all bone screws 18. Bone screw 18 is sized for extension through passageway 36 of bushing 16 and for pressing exterior surface 28 against internal wall 26 of locking plate 12 to form a friction lock between bushing 16 and locking plate 12. As shown in Fig. 5, bone screw 18 includes a leading portion 48 sized for extension through passageway 36 and into bone 11, an opposite trailing portion 50, and a middle portion 52 positioned to lie between leading and trailing portions 48, 50. Illustratively, leading portion 48 includes a plurality of sharp cutting edges 49 for self-tapping and reliefs 51 spaced apart from one another.
  • Bone screw 18 also includes an outer surface 54 and threads 56 extending about outer surface 54. Threads 56 have a thread pitch that is single lead 60 between leading and trailing portions 48, 50. Bone screw 18 also has thread pitch that is multiple lead 62 adjacent trailing portion 50. Simply, bone screw 18 includes a single lead 60 from tip to top with additional leads 62 being started within middle 52 toward trailing portion 50. Bone screw 18 is constructed of titanium alloy, although it is understood that bone screw 18 may be constructed of titanium, stainless steel, or any number of a wide variety of materials possessing the mechanical properties suitable for attachment with bone.
  • trailing portion 50 of bone screw 18 has a tapered portion 70 that diverges, as shown by lines 71, away from leading portion 48.
  • tapered portion diverges at an angle of about six degrees from leading portion 48.
  • Tapered portion 70 is sized to engage interior surface 30 of bushing 16 and expand diameter 68 of passageway 36 so that dimension 58 of slot 46 increases and exterior surface 28 is pressed against internal wall 26 to form the friction lock between bushing 16 and locking plate 12.
  • multiple lead 62 is positioned to lie on tapered portion 70. Thread pitch of multiple lead 62 has leads that start about 120°. It is understood that leads between leading and trailing portions 48, 50 may vary in pitch and number n accordance with the present invention.
  • bone screw 18 is illustrated and described, it is understood that locking plate 12 may be coupled to bone 1 1 with a variety of attachment components.
  • leading portion 48 of bone screw 18 may instead be a plug or a porous coated spike, so long as leading portion 48 attaches to bone 1 1 and trailing portion 50 expands bushing 16 frictionally to lock bushing 16 in position in plate hole 14.
  • locking plate apparatus 1 10 is provided that include locking plate 12, bushings 16, and drop-in bone screws 118. See Fig. 6.
  • locking plate apparatus 110 is similar to locking plate apparatus 10 illustrated in Figs. 1-5, like reference numerals will be used to denote like components.
  • bone screw 1 18 has a single lead 122 adjacent leading portion 48.
  • Bone screw 1 18 also has a tapered multiple lead 124 adjacent to trailing portion 50.
  • Multiple lead 124 has a diameter sized to spread bushing 16 to provide a friction lock with locking plate 12.
  • single lead 122 of bone screw 1 18 has a diameter as " shown by arrow 166 that is less than diameter 72 of threads 38 in bushing 16. Therefore, leading portion 48 of bone screw 1 18 is sized to slide through passageway 36 spaced apart from threads 38 of bushing 16.
  • Multiple lead 124 is positioned on tapered portion 70 of bone screw 1 18 and engages threads 38 on bushing 16. Referring to Fig. 6, threads 38 of bushing 16 are configured to receive threads 123 of multiple lead 124 thereon and to guide insertion of tapered portion 70 into passageway 36.
  • a graft screw 218 is illustrated in Fig. 7 and is suitable for use with subassembly 17 in accordance with the present invention.
  • Graft screw 218 is sized for extension through graft holes 25 and to stabilize the graft prior to fusion.
  • Graft screw 218 includes a leading portion 220 and an opposite headed trailing portion 222.
  • Graft screw 218 further includes an exterior wall 224 extending between leading and trailing portions 220, 222. Exterior wall 224 diverges from leading portion 220 toward trailing portion 222 at an angle of about six degrees.
  • threads 226 extend about exterior wall 224. As graft screw 218 extends into bone 1 1, exterior wall 224 becomes tighter and tighter against wall 23 until graft screw 218 snaps into place.
  • graft screw 28 is illustrated and described, it is understood that graft screws having a variety of shapes and sizes and other. suitable attachment mechanisms may be used in accordance with the present invention to stabilize the graft.
  • drill guide 130 includes a handle portion 132 and an elongated guide portion 134 defining a plate hole 136 having axis 137 extending therethrough.
  • Guide portion 134 includes an upper end 140 sized for insertion of a drill bit (not shown) therethrough and a lower end 142 having a stop portion 144 thereon. Stop portion 144 is sized to limit extension of guide portion 134 through plate hole 14 of locking plate 12.
  • lower end 142 includes threads 146 that are sized to engage threads 38 on bushing 16.
  • drill guide 130 is rotated relative to bushing 16 to couple threads 146 to threads 38 on bushing 16. While drill guide 130 is illustrated and described, it is understood that a drill tube or a wide variety of drill bit positioning mechanisms may be used to position bushing 16 in locking plate 12.
  • drill guide 130 engages bushing 16
  • the surgeon is free to rotate bushing 16 in plate hole 14 relative to vertebrae 11 along a plurality of axes 40, 42, 44 by moving handle portion 132 relative to locking plate 12.
  • a desirable position of bushing 16 relative to locking plate 12 is selected by angling bushing 16 so that axis 137 of guide portion 132 and therefore passageway 36 of bushing 16 extends through a desirable segment of bone 1 1.
  • the surgeon uses a drill (not shown) to drill a pilot hole (not shown) into vertebrae 11 that is sized to receive leading portion 48 of bone screw 18. Drill guide 130 is then removed from passageway 36 of bushing 16.
  • Leading portion 48 of bone screw 18 is then inserted into passageway 36 of expandable bushing 16.
  • threads 38 on bushing 16 receive threads 56 on leading portion 48 and guide leading portion 48 through passageway 36.
  • the surgeon then rotates trailing portion 50 as shown by arrow 51 until leading portion 48 exits first end 32 of bushing 16 and extends into pilot hole (not shown).
  • tapered portion 70 adjacent trailing portion 50 engages threads 38 on bushing 16.
  • Continued rotation 51 in bushing 16 causes threads 38 on bushing 16 to receive threads 62 on tapered portion 70 and guide tapered portion 70 into passageway 36.
  • tapered portion 70 expands diameter 68 of passageway 36 and presses exterior surface 28 of bushing 16 into a frictional locking engagement with internal wall 26 of locking plate 12. It is understood, that while drill guide 130 is illustrated and described, leading portion 48 of bone screw 18 may be formed to extend into bone 1 1 without a pilot hole.
  • leading portion 48 of bone screw 64 is inserted into passageway 36 of bushing 16. During insertion, leading portion 48 slides through passageway 36 so that threads 38 of bushing 16 are spaced apart from threads 56 of leading portion 48. Once leading portion 48 has "dropped into” pilot hole, tapered portion 70 adjacent to trailing portion 50 is rotated. Threads 38 on bushing 16 receive threads 123 on tapered portion 70 and guide tapered portion 70 into passageway 36. The surgeon continues to rotate bone screw 118 within bushing 16 until tapered portion 70 expands diameter 68 of passageway 36 and therefore presses spherical exterior surface 28 of bushing 16 into a frictional locking engagement with spherical internal wall 26 of locking plate 12.

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  • Health & Medical Sciences (AREA)
  • Orthopedic Medicine & Surgery (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Surgery (AREA)
  • Neurology (AREA)
  • General Health & Medical Sciences (AREA)
  • Veterinary Medicine (AREA)
  • Biomedical Technology (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Medical Informatics (AREA)
  • Molecular Biology (AREA)
  • Animal Behavior & Ethology (AREA)
  • Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
  • Public Health (AREA)
  • Engineering & Computer Science (AREA)
  • Dentistry (AREA)
  • Oral & Maxillofacial Surgery (AREA)
  • Surgical Instruments (AREA)
  • Snaps, Bayonet Connections, Set Pins, And Snap Rings (AREA)
  • Supporting Of Heads In Record-Carrier Devices (AREA)
  • Acyclic And Carbocyclic Compounds In Medicinal Compositions (AREA)
  • Specific Sealing Or Ventilating Devices For Doors And Windows (AREA)
  • Electromagnets (AREA)
  • Polishing Bodies And Polishing Tools (AREA)
PCT/US1998/014444 1997-07-29 1998-07-15 Polyaxial locking plate Ceased WO1999005968A1 (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
KR1020007000950A KR20010022371A (ko) 1997-07-29 1998-07-15 뼈 결합용 잠금판 장치
DE69839122T DE69839122T2 (de) 1997-07-29 1998-07-15 Polyaxiale befestigungsplatte
JP2000504791A JP4149130B2 (ja) 1997-07-29 1998-07-15 多軸固定板
AU83976/98A AU741780B2 (en) 1997-07-29 1998-07-15 Polyaxial locking plate
EP98934463A EP1005290B1 (en) 1997-07-29 1998-07-15 Polyaxial locking plate
AU2006252101A AU2006252101B8 (en) 1997-07-29 2006-12-18 Polyaxial locking plate

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US08/902,061 US5954722A (en) 1997-07-29 1997-07-29 Polyaxial locking plate
US08/902,061 1997-07-29

Publications (1)

Publication Number Publication Date
WO1999005968A1 true WO1999005968A1 (en) 1999-02-11

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ID=25415247

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1998/014444 Ceased WO1999005968A1 (en) 1997-07-29 1998-07-15 Polyaxial locking plate

Country Status (9)

Country Link
US (1) US5954722A (https=)
EP (1) EP1005290B1 (https=)
JP (1) JP4149130B2 (https=)
KR (1) KR20010022371A (https=)
AT (1) ATE385740T1 (https=)
AU (1) AU741780B2 (https=)
DE (1) DE69839122T2 (https=)
ES (1) ES2301205T3 (https=)
WO (1) WO1999005968A1 (https=)

Cited By (26)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2790198A1 (fr) * 1999-02-26 2000-09-01 Numedic Dispositif de solidarisation d'une piece sur un support, tel qu'une plaque d'osteosynthese sur une masse osseuse
DE10015734A1 (de) * 2000-03-02 2001-09-13 Med Medical Engineering Dev Lt Schraubverbindung für die Osteosynthese
FR2827499A1 (fr) * 2001-07-20 2003-01-24 Henry Graf Dispositif de liaison intervertebral
JP2003506189A (ja) * 1999-08-11 2003-02-18 ジンテーズ アクチエンゲゼルシャフト クール 外科用ガイドボディ
WO2006113257A1 (en) * 2005-04-14 2006-10-26 Warsaw Orthopedic, Inc. Anti-backout mechanism for an implant fastener
US7309340B2 (en) 2003-06-20 2007-12-18 Medicinelodge, Inc. Method and apparatus for bone plating
EP1870054A3 (en) * 2006-06-12 2008-05-14 Vilardell Purti, S.A. Dental implant
EP1824401A4 (en) * 2004-12-14 2008-12-17 Depuy Products Inc BONE PLATE WITH PREASSEMBLED DRILLING TIPS
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ATE385740T1 (de) 2008-03-15
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KR20010022371A (ko) 2001-03-15
EP1005290B1 (en) 2008-02-13
EP1005290A1 (en) 2000-06-07
US5954722A (en) 1999-09-21
ES2301205T3 (es) 2008-06-16
DE69839122T2 (de) 2009-03-05
AU741780B2 (en) 2001-12-06
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JP2001511386A (ja) 2001-08-14
AU8397698A (en) 1999-02-22

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