WO2000062691B1 - Variable angle connection assembly for a spinal implant system - Google Patents

Variable angle connection assembly for a spinal implant system

Info

Publication number
WO2000062691B1
WO2000062691B1 PCT/US2000/010965 US0010965W WO0062691B1 WO 2000062691 B1 WO2000062691 B1 WO 2000062691B1 US 0010965 W US0010965 W US 0010965W WO 0062691 B1 WO0062691 B1 WO 0062691B1
Authority
WO
WIPO (PCT)
Prior art keywords
washer
opening
stem
spinal implant
face
Prior art date
Application number
PCT/US2000/010965
Other languages
French (fr)
Other versions
WO2000062691A1 (en
Inventor
Richard B Ashman
Original Assignee
Richard B Ashman
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 Richard B Ashman filed Critical Richard B Ashman
Priority to AU46583/00A priority Critical patent/AU4658300A/en
Priority to DE10084498T priority patent/DE10084498T1/en
Publication of WO2000062691A1 publication Critical patent/WO2000062691A1/en
Publication of WO2000062691B1 publication Critical patent/WO2000062691B1/en

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
    • 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
    • A61B17/7035—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
    • A61B17/70—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
    • A61B17/7041—Screws or hooks combined with longitudinal elements which do not contact vertebrae with single longitudinal rod offset laterally from single row of screws or hooks
    • 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
    • A61B17/60—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 for external osteosynthesis, e.g. distractors, contractors
    • A61B2017/603—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 for external osteosynthesis, e.g. distractors, contractors with three points of contact, e.g. tripod
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B90/00—Instruments, implements or accessories specially adapted for surgery or diagnosis and not covered by any of the groups A61B1/00 - A61B50/00, e.g. for luxation treatment or for protecting wound edges
    • A61B90/03—Automatic limiting or abutting means, e.g. for safety
    • A61B2090/037—Automatic limiting or abutting means, e.g. for safety with a frangible part, e.g. by reduced diameter

Abstract

A spinal implant assembly includes an elongated spinal implant, such as a rod (R), implanted adjacent the spine, and a bone fastener, such as a bone screw (40), engaged within a vertebra. A connection assembly includes a first member (31) having a first opening (32) for receiving the rod (52), and a second member (35) having a second opening (36) for receiving an elongated stem (42) of the bone fastener (40). The two members (31, 32) are connected (39, 70, 71) to permit relative rotation between the two members to accommodate variable angular orientations of the bone screw relative to the rod. A single washer (50) is provided that has an opening (55) for positioning over a portion of both the first member and the second member. One face (52) of the washer is configured to engage the rod, while the opposite face (53) of the washer is configured to engage the stem of the bone screw. In one embodiment, the opposite face (53) of the washer (50) defines a plurality of radial splines (54). The stem (42) of the bone screw (40) includes an interface element in the form of a rib (45) that is configured to interdigitate with the radial splines (54). In another embodiment, the opposite face (70) of the washer (75) and the stem (81) of the bone screw (80) include interdigitating or interlocking raised features (77, 86), such as knurling or cross-hatching. A set screw (60) and threaded bore (65) are provided in the first member (31), with the set screw (60) bearing against the rod (R), which then bears against the washer (50, 75) and bone screw stem (41, 81) to clamp the assembly together.

Claims

AMENDED CLAIMS
[received by the International Bureau on 20 October 2000 (20 10 00). ongmal claim 21 amended, remaining claims unchanged (1 page)]
a first member defining a first opening sized to slidingly receive the elongated spinal implant therethrough; a second member defining a second opening to slidingly receive said elongated stem of said bone fastener therethrough; means for connecting said first member to said second member for rotation about a connection axis substantially perpendicular to an axis of said first opening and an axis of said second opening; one washer defining an opening for positioning said washer over said first member and said second member and between said first opening and said second opening, said one washer having a first face contacting a portion of the elongated spinal implant when the implant extends through said first opening, and an opposite second face adjacent said engagement surface of said bone fastener when the stem extends through said second opening; engagement means between said second face and said engagement surface of said elongated stem for resisting rotation of said bone fastener relative to said washer; and means for urging the elongated spinal implant and the elongated stem of the bone fastener together to clamp about said one washer.
22. The spinal implant assembly according to claim 21 , wherein said engagement means includes: a plurality of splines defined at said second face of said washer and radially emanating from said opening; and at least one rib defined at said engagement surface of said elongated stem of said bone fastener, said at least one rib configured to engage said second face of said washer between adjacent ones of said plurality of splines.
23. The spinal implant assembly according to claim 21 , wherein said engagement means includes: a first raised pattern defined at said second face of said; and
35
PCT/US2000/010965 1999-04-21 2000-04-21 Variable angle connection assembly for a spinal implant system WO2000062691A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
AU46583/00A AU4658300A (en) 1999-04-21 2000-04-21 Variable angle connection assembly for a spinal implant system
DE10084498T DE10084498T1 (en) 1999-04-21 2000-04-21 Angle-variable connection arrangement for a spinal implant system

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US09/296,104 US6183473B1 (en) 1999-04-21 1999-04-21 Variable angle connection assembly for a spinal implant system
US09/296,104 1999-04-21

Publications (2)

Publication Number Publication Date
WO2000062691A1 WO2000062691A1 (en) 2000-10-26
WO2000062691B1 true WO2000062691B1 (en) 2000-12-14

Family

ID=23140626

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2000/010965 WO2000062691A1 (en) 1999-04-21 2000-04-21 Variable angle connection assembly for a spinal implant system

Country Status (4)

Country Link
US (2) US6183473B1 (en)
AU (1) AU4658300A (en)
DE (1) DE10084498T1 (en)
WO (1) WO2000062691A1 (en)

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WO2000062691A1 (en) 2000-10-26
US6183473B1 (en) 2001-02-06
US6402749B1 (en) 2002-06-11
AU4658300A (en) 2000-11-02
DE10084498T1 (en) 2002-05-16

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