CA2346986A1 - Set screw for medical implants - Google Patents

Set screw for medical implants Download PDF

Info

Publication number
CA2346986A1
CA2346986A1 CA002346986A CA2346986A CA2346986A1 CA 2346986 A1 CA2346986 A1 CA 2346986A1 CA 002346986 A CA002346986 A CA 002346986A CA 2346986 A CA2346986 A CA 2346986A CA 2346986 A1 CA2346986 A1 CA 2346986A1
Authority
CA
Canada
Prior art keywords
base
slots
tool
breakaway region
set 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
CA002346986A
Other languages
French (fr)
Other versions
CA2346986C (en
Inventor
Roger P. Jackson
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of CA2346986A1 publication Critical patent/CA2346986A1/en
Application granted granted Critical
Publication of CA2346986C publication Critical patent/CA2346986C/en
Anticipated expiration legal-status Critical
Expired - Fee Related 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, 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
    • A61B17/7074—Tools specially adapted for spinal fixation operations other than for bone removal or filler handling
    • A61B17/7091—Tools specially adapted for spinal fixation operations other than for bone removal or filler handling for applying, tightening or removing longitudinal element-to-bone anchor locking elements, e.g. caps, set screws, nuts or wedges
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S606/00—Surgery
    • Y10S606/916—Tool for installing or removing orthopedic fastener

Abstract

This invention is a low profile removable set screw (1) for use in connecting one medical implant to another, and for similar uses. The set screw has a base (11), and a head (10) that is breakable from the base in a breakaway region (12) at a preselected torque, such that the head allows rotation of the screws and torquing of a tip of the base against one of the implants during installation. The screw includes a groove (32) or a notch at the breakaway region to trigger breaking. The screw also includes a pair of slots (35, 36) extending radially from an outer threaded surface (24) of the base part way into the base. The slots intersect with the breakaway region, but not with each other leaving a center core in the base. A tool (4) is provided for removing the base after the head is broken away.
The tool includes a pair of spaced ears (54, 55) that are received in the slots, and provide for rotation of the base by rotating the tool. A bore of larger width than the slots is centered on each slot at the breakaway region providing relief for metal adjacent to the bores during torquing, and breaking.
CA002346986A 1998-10-22 1999-07-12 Set screw for medical implants Expired - Fee Related CA2346986C (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US09/177,460 US6059786A (en) 1998-10-22 1998-10-22 Set screw for medical implants
US09/177,460 1998-10-22
US09/177,244 US6102913A (en) 1998-10-22 1998-10-22 Removeable set screw for medical implant
PCT/US1999/015684 WO2000022997A1 (en) 1998-10-22 1999-07-12 Set screw for medical implants

Publications (2)

Publication Number Publication Date
CA2346986A1 true CA2346986A1 (en) 2000-04-27
CA2346986C CA2346986C (en) 2005-12-06

Family

ID=47560939

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002346986A Expired - Fee Related CA2346986C (en) 1998-10-22 1999-07-12 Set screw for medical implants

Country Status (6)

Country Link
US (2) US6059786A (en)
EP (1) EP1123055A4 (en)
JP (1) JP2002527187A (en)
AU (1) AU754078B2 (en)
CA (1) CA2346986C (en)
WO (1) WO2000022997A1 (en)

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EP1123055A1 (en) 2001-08-16
US6059786A (en) 2000-05-09
US6102913A (en) 2000-08-15
JP2002527187A (en) 2002-08-27
EP1123055A4 (en) 2003-02-05
CA2346986C (en) 2005-12-06
AU5096399A (en) 2000-05-08
WO2000022997A1 (en) 2000-04-27
AU754078B2 (en) 2002-11-07

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