EP0917450A1 - Plaque pour osteosynthese - Google Patents

Plaque pour osteosynthese

Info

Publication number
EP0917450A1
EP0917450A1 EP96925632A EP96925632A EP0917450A1 EP 0917450 A1 EP0917450 A1 EP 0917450A1 EP 96925632 A EP96925632 A EP 96925632A EP 96925632 A EP96925632 A EP 96925632A EP 0917450 A1 EP0917450 A1 EP 0917450A1
Authority
EP
European Patent Office
Prior art keywords
bone
plate according
bone plate
plate
island
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.)
Withdrawn
Application number
EP96925632A
Other languages
German (de)
English (en)
Inventor
Slobodan Tepic
Stephen J. Bresina
Stephan Perren
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.)
AO Technology AG
Original Assignee
Synthes AG Chur
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 Synthes AG Chur filed Critical Synthes AG Chur
Publication of EP0917450A1 publication Critical patent/EP0917450A1/fr
Withdrawn legal-status Critical Current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
    • 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
    • A61B17/8052—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
    • 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

Definitions

  • the invention relates to a bone plate according to the preamble of claim 1 and a device for bone fixation according to the preamble of claim 13.
  • Bone plates with conical plate holes are already known from the prior art, which enable a rigid connection between the plate and the bone screws to be inserted therein, which connection is maintained even if the bone contact is lost.
  • Bone plates are also known, which have a concave structured underside intended for bone contact and thereby reduce the degree of coverage of the bone, which leads to an improved healing process.
  • bone plates are also known which have enlarged plate holes on the upper side in order to permit a certain countersinking of the screw head.
  • the invention seeks to remedy this.
  • the invention is based on the problem of creating a bone plate which, in addition to optimal healing properties, has the smallest possible volume (and thus weight) and nevertheless high strength.
  • the invention achieves the stated object with a bone plate, which has the features of claim 1, and a device for bone fixation, which has the features of claim 13.
  • Bone / plate bond no longer on the friction but forms a positive system.
  • the recesses in the underside of the bone plate on the one hand comprise a first cylindrical recess, the The cylinder axis of the first cylindrical recess runs parallel to the longitudinal axis and, on the other hand, comprises a plurality of second cylindrical recesses, the cylinder axes of the second cylindrical recesses running between the individual plate holes and perpendicular to the longitudinal axis.
  • the two long sides expediently converge in the direction of the underside of the bone plate.
  • the conically tapering plate holes should expediently have a cone angle ⁇ in the range from 5 ° to 7 °, preferably from 5.5 ° to 6.5 °.
  • a further preferred development consists in that the radius of the first cylindrical recess is between 3.2 and 3.8 mm, preferably between 3.4 and 3.6 mm and the radius of the second cylindrical recess between 9 and 15 mm, preferably between 10 and 12 mm.
  • the bone plate expediently has a width of 8-11 mm, preferably 9-10 mm and a minimum thickness of 1.9-2.8 mm, preferably 2.0-2.4 mm.
  • FIG. 1 shows a cross section through the bone plate according to the invention
  • FIG. 2 is a partial plan view of the bone plate according to the invention according to FIG. 1,
  • FIG. 3 shows a partial longitudinal section through the bone plate according to the invention according to FIG. 1;
  • FIGS. 1-3 shows a plan view of a modified bone plate according to the invention.
  • the bone plate shown in FIGS. 1-3 essentially comprises an upper side 1, an underside 2 intended for bone contact, two longitudinal sides 13, a number of plate holes 3 which extend from the upper side 1 to the underside 2 and a longitudinal axis 10.
  • the cross section of the plate holes 3 tapers conically from the top 1 towards the bottom 2, the cone angle a being 5.72 °.
  • the largest cross-sectional area of the plate hole 3 is 12.8 mm 2 .
  • the surface of the upper side 1 adjoining the plate holes 3 has an island-like depression 4 opposite the remaining surface of the upper side 1.
  • the island-like depression 4 has a total area, including the area of the plate hole 3 enclosed by it, of 42.8 mm 2 .
  • the island-like depression 4 on the top side 1 of the bone plate - as shown in FIG. 4 - can also have a butterfly shape with two dovetails running in the direction of the longitudinal axis 10. Surprisingly, it has been shown that this design of the island-like recess 4 brings about a particularly good mechanical strength of the plate (with the same weight for the rest).
  • the underside 2 of the bone plate is - as shown in FIGS. 1 and 3 - provided with two different types of recesses 5, 6, which form a plurality of support tips 12 intended for bone contact.
  • the Au peaks can be more or less blunt, - what is essential is the reduction of the total bone contact area of the bone plate that can be achieved thereby.
  • the recesses 5, -6 in the underside 2 of the bone plate comprise on the one hand a first cylindrical recess 5, the cylinder axis 7 of the first cylindrical recess 5 running parallel to the longitudinal axis 10, and on the other hand a multiplicity of second cylindrical recesses 6, the cylinder axes 8 of the second cylindrical recesses 6 between the individual plate holes 3 and perpendicular to the longitudinal axis 10.
  • the radius 9 of the first cylindrical recess 5 is approximately 3.5 mm and the radius 11 of the second cylindrical recess 6 is approximately 15 mm.
  • the width of the bone plate is 9.5 mm and its minimum thickness is 2.2 mm.
  • the distance between the individual plate holes 3 is 13 mm.
  • the island-like depression 4 has a total area, including the area of the plate hole 3 enclosed by it, of approximately 38 to 47 mm, preferably of 41 to 44 mm.
  • the island-like expediently points Indentation 4 has a total area F, including the area f of the plate hole 3 enclosed by it, of 2.5 f ⁇ F ⁇ 4.2 f, preferably of 3.0 f ⁇ F ⁇ 3.6 f.
  • the volume of the island-like depressions 4, including their area in the plate hole, is expediently at least 20 mm 3 , preferably at least 25 mm 3 and is expediently at most 50 mm 3 , preferably at most 40 mm 3 in size.

Landscapes

  • Health & Medical Sciences (AREA)
  • Orthopedic Medicine & Surgery (AREA)
  • Surgery (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
  • Engineering & Computer Science (AREA)
  • Biomedical Technology (AREA)
  • Neurology (AREA)
  • Medical Informatics (AREA)
  • Molecular Biology (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Surgical Instruments (AREA)
  • Prostheses (AREA)

Abstract

Cette plaque pour ostéosynthèse comprend une face supérieure (1), une face inférieure (2) à mettre en contact avec l'os, deux côtés longitudinaux (13), une pluralité d'orifices (3) qui s'étendent de la face supérieure (1) à la face inférieure (2) et un axe longitudinal (10). La section transversale des orifices (3) diminue de la face supérieure (1) vers la face inférieure et la face inférieure (2) est pourvue de cavités. La surface de la face supérieure (1) autour des orifices (3) forme des cavités (4) en forme d'îles par rapport à la surface restante de la face supérieure (1). La face inférieure (2) est pourvue de deux types différents de cavités (5; 6) qui créent une pluralité de pointes de support (12) à mettre en contact avec l'os. En outre, les orifices (3) se rétrécissent coniquement de la face supérieure (1) à la face inférieure (2).
EP96925632A 1996-08-12 1996-08-12 Plaque pour osteosynthese Withdrawn EP0917450A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/CH1996/000278 WO1998006345A1 (fr) 1996-08-12 1996-08-12 Plaque pour osteosynthese

Publications (1)

Publication Number Publication Date
EP0917450A1 true EP0917450A1 (fr) 1999-05-26

Family

ID=4550443

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96925632A Withdrawn EP0917450A1 (fr) 1996-08-12 1996-08-12 Plaque pour osteosynthese

Country Status (5)

Country Link
US (1) US6309393B1 (fr)
EP (1) EP0917450A1 (fr)
JP (1) JP2000516493A (fr)
CA (1) CA2262441C (fr)
WO (1) WO1998006345A1 (fr)

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US7909848B2 (en) 2003-06-27 2011-03-22 Depuy Spine, Inc. Tissue retractor and guide device
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Also Published As

Publication number Publication date
US6309393B1 (en) 2001-10-30
CA2262441C (fr) 2004-12-28
JP2000516493A (ja) 2000-12-12
CA2262441A1 (fr) 1998-02-19
WO1998006345A1 (fr) 1998-02-19

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