WO2000018312B1 - Multi-axis connections between spinal stabilizers and screws - Google Patents

Multi-axis connections between spinal stabilizers and screws

Info

Publication number
WO2000018312B1
WO2000018312B1 PCT/US1999/022232 US9922232W WO0018312B1 WO 2000018312 B1 WO2000018312 B1 WO 2000018312B1 US 9922232 W US9922232 W US 9922232W WO 0018312 B1 WO0018312 B1 WO 0018312B1
Authority
WO
WIPO (PCT)
Prior art keywords
washer
elongate member
screw
bar
cross
Prior art date
Application number
PCT/US1999/022232
Other languages
French (fr)
Other versions
WO2000018312A1 (en
Inventor
Madhavan Pisharodi
Original Assignee
Perumala Corp
Madhavan Pisharodi
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 Perumala Corp, Madhavan Pisharodi filed Critical Perumala Corp
Priority to CA002345042A priority Critical patent/CA2345042A1/en
Priority to AU61626/99A priority patent/AU6162699A/en
Priority to DE69932444T priority patent/DE69932444T2/en
Priority to EP99948454A priority patent/EP1115344B1/en
Publication of WO2000018312A1 publication Critical patent/WO2000018312A1/en
Publication of WO2000018312B1 publication Critical patent/WO2000018312B1/en
Priority to US09/641,448 priority patent/US6669697B1/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
    • A61B17/7043—Screws or hooks combined with longitudinal elements which do not contact vertebrae with a longitudinal element fixed to one or more transverse elements which connect multiple 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
    • A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
    • A61B17/70—Spinal positioners or stabilisers ; Bone stabilisers comprising fluid filler in an implant
    • A61B17/7001—Screws or hooks combined with longitudinal elements which do not contact vertebrae
    • A61B17/7002—Longitudinal elements, e.g. rods
    • A61B17/7011—Longitudinal element being non-straight, e.g. curved, angled or branched
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
    • A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
    • A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
    • A61B17/70—Spinal positioners or stabilisers ; Bone stabilisers comprising fluid filler in an implant
    • A61B17/7001—Screws or hooks combined with longitudinal elements which do not contact vertebrae
    • A61B17/7041—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
    • A61B17/68—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
    • A61B17/7058—Plates mounted on top of bone anchor heads or shoulders
    • 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
    • A61B17/8695—Washers

Abstract

A multi-axis correction washer for use with a spinal stabilizer for internal spinal fixation. The bodies of the washer are provided in cylindrical and wedge-shaped cylindrical configurations with a passage in the center of the longitudinal axis of the cylinder and/or offset from the center axis of the cylindrical washer and a shoulder or other structure for rotatably engaging a hole in a spinal implant. The spinal implant can be a plate and screw-type, ladder-type, or monorail-type spinal fixation system. The washer is rotated to provide an infinite range of angles and screw placements relative to the central axis of the spinal column for maximum flexibility of installation and to effectively transfer the load on the spinal column to the implant, all while maintaining an angle of approximately 90° between the head of the screw and/or nut and the washer which engages the implant.

Claims

27AMENDED CLAIMS[received by the International Bureau on 4 April 2000 (04.04.00); original claims 1-42 replaced by new claims 1-11 (2 pages)]
1. An internal spinal stabilizer comprising: a first elongate member; a second elongate member having an aperture therein; means for attaching said second elongate member to said first elongate member: a screw for passing through said aperture for affixing said second elongate member to the vertebra of a patient; and a set of washers, each of said washers being provided with a passage for receiving said screw therethrough and means for engaging said second elongate member adjacent the periphery of the aperture at any one of a plurality of rotational orientations relative to said second elongate member, at least one of the washers of said set of washers comprising a cylindrical body having (a) an end defining a surface against which said screw bears that is inclined relative to the axis of the passage through the washer and (b) the central axis of the passage offset from the center of the body forming the washer, for providing a multiaxial coupling between the vertebra and the second elongate member when rotated relative to said elongate member.
2. The spinal stabilizer of claim 1 wherein the angle of the bearing surface of said washer relative to the axis of the passage through the washer is an acute angle.
3. The spinal stabilizer of claim 1 or 2 wherein at least one washer of said set of washers has a surface against which said screw bears that is angled relative to the axis of the passage through the washer and a passage with a central axis that is coincident with the center axis of the washer.
4. The spinal stabilizer of any of the preceding claims wherein the rotatable engaging means of said washers comprises a shoulder formed on each washer of said set of washers for engaging the surface of said second elongate member adjacent the periphery of the aperture, each said washer being rotatable relative to said second elongate member about a notional rotational axis which extends through the aperture on said shoulder.
5. The spinal stabilizer of any of the preceding claims wherein said second elongate member is attached to said first elongate member at approximately a 90° angle.
6. The spinal stabilizer of claim 1 wherein said second elongate member is slidably attached to said first elongate member for movement relative to said first elongate member. 28
7. The spinal stabilizer of claim 1 wherein said first elongate member is slidably attached to said second elongate member for movement relative to said second elongate member.
8. A method of affixing a spinal stabilizer comprising a washer, a cross-bar, and a screw to the vertebral body of a patient comprising the steps of: engaging the cross-bar with the washer; inserting the screw through an an off-center passage in the washer; changing the axis of the screw relative to the vertebral body to which the crossbar is affixed by rotating the washer relative to the cross-bar: and driving the screw into the vertebral body of the patient to tighten the screw against the washer.
9. The method of claim 8 in which the washer is engaged to the cross-bar by resting the washer on the cross-bar adjacent the periphery of an aperture in the cross-bar.
10. A method of affixing a spinal stabilizer comprising a washer having a cylindrical body with one end inclined with respect to the side walls of the cylinder and having a passage therethrough, a cross-bar, and a screw to the vertebral body of a patient comprising the steps of: engaging the cross-bar with the washer; inserting the screw through the passage in the washer; changing the angle of the screw relative to the cross-bar to which the washer is engaged by rotating the washer relative to the cross-bar; and driving the screw into the vertebral body of the patient to tighten the screw against the washer.
1 1. The method of claim 10 in which the washer is engaged to the cross-bar by resting the washer on the cross-bar adjacent the periphery of an aperture in the cross-bar.
29
STATEMENT UNDER ARTICLE 19
Submitted herewith for filing in the captioned International Application are new claims 1- 1 1, filed under Art. 19 of the Patent Cooperation Treaty. Applicant makes the following under Article 19(1).
Claims 1-24 of the replaced sheets have been replaced by claims 1-7, written to define over the references cited in the International Search Report. Claims 1-7 are based on original claim 16 but have been narrowed by additionally reciting that the invention comprises a set of washers as described in the disclosure. At least one of the washers comprising the claimed set of washers is recited as including an inclined bearing surface and an offset passage for providing a multiaxial coupling between vertebra and spinal stabilizer. New claims 8-11 are identical to claims 25-28 of the application as filed.
PCT/US1999/022232 1998-09-25 1999-09-24 Multi-axis connections between spinal stabilizers and screws WO2000018312A1 (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
CA002345042A CA2345042A1 (en) 1998-09-25 1999-09-24 Multi-axis connections between spinal stabilizers and screws
AU61626/99A AU6162699A (en) 1998-09-25 1999-09-24 Multi-axis connections between spinal stabilizers and screws
DE69932444T DE69932444T2 (en) 1998-09-25 1999-09-24 MULTI-CHANNEL CONNECTION BETWEEN SPHERICAL COLUMN SUPPORTS AND SCREWS
EP99948454A EP1115344B1 (en) 1998-09-25 1999-09-24 Multi-axis connections between spinal stabilizers and screws
US09/641,448 US6669697B1 (en) 1998-09-25 2000-08-17 Self-retaining bolt for internal spinal stabilizers

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US09/161,141 1998-09-25
US09/161,141 US6355038B1 (en) 1998-09-25 1998-09-25 Multi-axis internal spinal fixation

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
US09/161,141 Continuation-In-Part US6355038B1 (en) 1998-09-25 1998-09-25 Multi-axis internal spinal fixation

Related Child Applications (1)

Application Number Title Priority Date Filing Date
US09/641,448 Continuation-In-Part US6669697B1 (en) 1998-09-25 2000-08-17 Self-retaining bolt for internal spinal stabilizers

Publications (2)

Publication Number Publication Date
WO2000018312A1 WO2000018312A1 (en) 2000-04-06
WO2000018312B1 true WO2000018312B1 (en) 2000-06-02

Family

ID=22579986

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1999/022232 WO2000018312A1 (en) 1998-09-25 1999-09-24 Multi-axis connections between spinal stabilizers and screws

Country Status (7)

Country Link
US (1) US6355038B1 (en)
EP (1) EP1115344B1 (en)
AT (1) ATE333243T1 (en)
AU (1) AU6162699A (en)
CA (1) CA2345042A1 (en)
DE (1) DE69932444T2 (en)
WO (1) WO2000018312A1 (en)

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CA2345042A1 (en) 2000-04-06
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DE69932444D1 (en) 2006-08-31
ATE333243T1 (en) 2006-08-15
US6355038B1 (en) 2002-03-12
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WO2000018312A1 (en) 2000-04-06
EP1115344B1 (en) 2006-07-19

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