CA2158890A1 - Spherical washer for use with a bone screw - Google Patents

Spherical washer for use with a bone screw

Info

Publication number
CA2158890A1
CA2158890A1 CA002158890A CA2158890A CA2158890A1 CA 2158890 A1 CA2158890 A1 CA 2158890A1 CA 002158890 A CA002158890 A CA 002158890A CA 2158890 A CA2158890 A CA 2158890A CA 2158890 A1 CA2158890 A1 CA 2158890A1
Authority
CA
Canada
Prior art keywords
bone screw
spherical washer
head
diameter
washer
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
CA002158890A
Other languages
French (fr)
Other versions
CA2158890C (en
Inventor
John Runciman
Samuel G. Agnew
Ross Kenneth Leighton
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.)
Terray Corp
Original Assignee
John Runciman
Samuel G. Agnew
Ross Kenneth Leighton
Terray Corporation
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 John Runciman, Samuel G. Agnew, Ross Kenneth Leighton, Terray Corporation filed Critical John Runciman
Priority to CA002158890A priority Critical patent/CA2158890C/en
Priority to CH00976/96A priority patent/CH693165A5/en
Priority to GB9608815A priority patent/GB2305483B/en
Publication of CA2158890A1 publication Critical patent/CA2158890A1/en
Priority to US08/916,741 priority patent/US5797912A/en
Application granted granted Critical
Publication of CA2158890C publication Critical patent/CA2158890C/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • A61B17/80—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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B43/00—Washers or equivalent devices; Other devices for supporting bolt-heads or nuts
    • F16B43/02—Washers or equivalent devices; Other devices for supporting bolt-heads or nuts with special provisions for engaging surfaces which are not perpendicular to a bolt axis or do not surround the bolt
    • 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 washer for use with a bone screw has a head of a first diameter. The washer has a generally hemispherical recess dimensioned to fit the head of such bone screw, and an exterior shape closely approximating the shape of a head of a bone screw and having a second diameter that is larger than the first diameter.
CA002158890A 1995-09-22 1995-09-22 Spherical washer for use with a bone screw Expired - Lifetime CA2158890C (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
CA002158890A CA2158890C (en) 1995-09-22 1995-09-22 Spherical washer for use with a bone screw
CH00976/96A CH693165A5 (en) 1995-09-22 1996-04-17 A device for stabilizing a bone fracture
GB9608815A GB2305483B (en) 1995-09-22 1996-04-30 Washer for use with a bone screw
US08/916,741 US5797912A (en) 1995-09-22 1997-08-19 Washer for use with a bone screw

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CA002158890A CA2158890C (en) 1995-09-22 1995-09-22 Spherical washer for use with a bone screw

Publications (2)

Publication Number Publication Date
CA2158890A1 true CA2158890A1 (en) 1997-03-23
CA2158890C CA2158890C (en) 2002-01-22

Family

ID=4156632

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002158890A Expired - Lifetime CA2158890C (en) 1995-09-22 1995-09-22 Spherical washer for use with a bone screw

Country Status (4)

Country Link
US (1) US5797912A (en)
CA (1) CA2158890C (en)
CH (1) CH693165A5 (en)
GB (1) GB2305483B (en)

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Also Published As

Publication number Publication date
CH693165A5 (en) 2003-03-27
US5797912A (en) 1998-08-25
CA2158890C (en) 2002-01-22
GB2305483B (en) 1999-09-15
GB9608815D0 (en) 1996-07-03
GB2305483A (en) 1997-04-09

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Effective date: 20150922