EP3302323A1 - Élément d'ancrage osseux monoplan - Google Patents

Élément d'ancrage osseux monoplan

Info

Publication number
EP3302323A1
EP3302323A1 EP16718268.2A EP16718268A EP3302323A1 EP 3302323 A1 EP3302323 A1 EP 3302323A1 EP 16718268 A EP16718268 A EP 16718268A EP 3302323 A1 EP3302323 A1 EP 3302323A1
Authority
EP
European Patent Office
Prior art keywords
groove
screw
bone anchoring
bearing element
bearing
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Withdrawn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
EP16718268.2A
Other languages
German (de)
English (en)
Inventor
Frank Heuer
Enrico Wirth
Frank Trautwein
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.)
Silony Medical International AG
Original Assignee
Silony Medical International AG
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 Silony Medical International AG filed Critical Silony Medical International AG
Publication of EP3302323A1 publication Critical patent/EP3302323A1/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Withdrawn legal-status Critical Current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
    • A61B17/70—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
    • A61B17/7032—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
    • A61B17/7001—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

Definitions

  • the invention relates to a uniplanar bone anchoring element and in particular to a uniplanar pedicle screw in which the screw shaft can be pivoted in only one plane.
  • bone anchoring elements such as pedicle screws are known in the art.
  • Such bone anchoring elements are used, for example, to correct vertebral deformities by screwing these anchoring elements into the vertebral bone and then connecting them via transverse rods in order to correct the misalignments and fix them in the correct position.
  • Such anchoring elements can be designed as a monocarp robs, wherein the screw shaft is fixedly connected to the receiving element for the cross bar and in which the orientation of the receiving element is therefore fixed with respect to the longitudinal axis of the screw shaft.
  • Another embodiment is designed as a polyaxial screw, in which the bone screw which is screwed into the vertebral bone, with respect to the receiving element is arbitrarily pivotable.
  • the EP 1 923 011 therefore proposes a system in which two lateral through-holes are mounted in a receiving element into which two pins can be inserted against which then abut two flat surfaces on the screw head.
  • the flat surfaces on the screw head in conjunction with the two pins on the sides, ensure that the shaft with the bone thread can only be pivoted in one plane.
  • the problem with this is, however, that the pins only with a rounded side on the flat surfaces of the Make screw and so a very high precision in the manufacture of the pins and the pin holes is required.
  • a uniplanar bone anchoring element comprises an anchoring screw with a bone thread and a screw head, wherein the screw head is flattened on at least one side, a receiving element, wherein the receiving element has a through hole which tapers in a lower region and in which the anchoring screw can be received, and two upwardly extending legs with a thread profile in an upper region which is designed for screwing a fastening screw, wherein the receiving element in the seating area anchoring screw head has an at least partially extending inner groove and a bearing element for insertion into the inner groove of the receiving element, wherein the Bearing element is partially flattened on at least one side, wherein the groove and the bearing element are formed such, in particular complementary, that position the bearing element in the groove in a predetermined position t is.
  • the predetermined position defines not only the circumferential direction, which is preferably determined by the two end walls of the groove, but also the position of the flattened side of the bearing element, which should be directed to the screw head. This ensures that the flattened side of the bearing element bears against the flattened side of the screw head, since the bearing element can not rotate in the groove.
  • the respective ends extend in the circumferential direction. This means that the ends do not stop abruptly, but the groove bottom rises continuously until the groove is no longer present.
  • this Nutauslauf has a length of at most 7 mm, preferably 5mm and more preferably 3 mm.
  • the outlet is preferably at least 0.5 mm to 1 mm long. Such an outlet has the advantage that it is easy to manufacture, at the same time the bearing element in the groove but prevented by the already slight increase at the start of the run in the assembled state slipping of the bearing element in the groove.
  • the inner groove extends in the circumferential direction, preferably over half the circumference, more preferably over three quarters of the circumference.
  • the circumferential groove and the bearing element are formed at least semicircular circumferential and have the advantage that the position of the bearing element is then fixed in each direction. Once the bearing element is inserted in a semicircular groove, it can not fall out even without inserted into the receiving element screw.
  • the cross-section of the groove and the bearing element define the predetermined position.
  • a vertical surface and on the bearing element may be provided a complementary additional vertical surface, so that the bearing element can sit in the groove only in one position.
  • the groove base is formed as a flat surface, so that the Lagerlement can align with a corresponding surface on the groove bottom.
  • the inner groove and in particular the groove base may be arc-shaped in the circumferential direction, but may also be straight. In a U-förmigen Lagerlement with straight legs, these can slip prevent the bearing element in the groove in the circumferential direction.
  • the bearing element may be formed as a part-circular bracket.
  • the inner groove is preferably formed below the legs of the receiving element. This ensures that the flat contact surfaces of the screw head and the bearing element are not affected by the arrangement of other components of the bone anchoring element.
  • the bearing element is preferably annular, more preferably U-shaped with two substantially parallel legs, so that the screw head can be accommodated between these parallel legs. Further, the bearing element is preferably formed with a substantially rectangular cross section, which facilitates a concern of the surfaces between the groove and the bearing element and between the bearing element and the screw head. The edges of the groove and the bearing element are preferably provided with radii, which does not affect the contact and the tight fit between the items.
  • the anchoring screw on two substantially opposite sides flattened points, so that the screw can come into contact with a bearing element on both sides.
  • this embodiment is used with the U-shaped bearing element.
  • FIG. 1a shows an isometric view of a mounted uniplanar bone anchoring element according to the present invention
  • FIG. 1b shows an exploded view of the uniplanar bone anchoring element from FIG. 1a;
  • Figure 2a shows a longitudinal section of a mounted uniplanar bone anchoring element according to the present invention;
  • FIG. 2b shows the individual parts of a mounted uniplanar bone anchoring element from FIG. 2a;
  • Figure 3 shows a section through the receiving element at the upper end of the inner groove and the seat of a U-shaped bearing element on the screw head.
  • FIG. 2a In the following discussion of top and bottom, reference is made to an arrangement which can be seen in FIG. 2a.
  • the upper end of the uniplanar screw thus concerns the upper end of the receiving part with the thread, while the lower end relates to the tip of the screw shaft.
  • the axial direction of the bone anchoring element of Fig. 2a is meant, the radial direction is perpendicular to the axial direction, and a circumferential direction denotes a direction around the axial direction.
  • FIG. 1 a shows an isometric view of the bone anchoring element 10 according to the invention.
  • the bone anchoring element 10 comprises a screw 12 which is anchored in the bone, a receiving element 20 for receiving the screw 12 and a transverse bar (not shown), a pressure piece 30 with which the screw 12 is mounted in the receiving element 20, and the bearing element 40
  • the screw 12 consists of a screw shaft and a screw head 18.
  • a bone thread 14 is arranged, which may be designed to be at least partially more continuous.
  • the screw may have a through hole 11, which may include openings 16 in the screw shaft in the lower region.
  • a screw screwed into the bone with bone cement can be secured in the bone, in which the bone cement is brought through the bore to the lower end of the screw 12.
  • a flattened area 17 is provided on at least one side, preferably and as shown in the figures, this flattened area 17 is provided on two substantially opposite sides of the screw head 18.
  • more than two be provided opposite flats for example, four flattened areas, which are each offset by 90 ° to each other, or even eight, which are then offset by 45 ° to each other.
  • Such a screw has several end positions in which the flattened areas on the screw head can interact with the flattened areas on the bearing element.
  • the pressure piece 30, in which the receiving element 20 is inserted serves to hold the screw in the receiving element 20.
  • a pressing force applied which in turn apply a force in the bores 32 of the pressure piece 30 and compress the pressure piece on the screw.
  • the pressure piece 30 has a recess 33, in which later the cross bar is inserted.
  • the receiving element 20 has a through hole with a tapered lower end 21. In this tapered lower end 21 of the lower part of the screw head 18 is mounted.
  • the receiving member 20 further includes the above-mentioned holes 22 for compressing the pressure piece and two legs 25, 26 which extend upwardly and include an internal thread 27.
  • a pressure screw is screwed later, which presses on the cross bar and thus fixes all components of the bone anchoring element.
  • this thread is shown as an internal thread, but it is also easily possible to do this as an external thread and not to use a grub screw as a pressure screw, but a nut.
  • the receiving element 20 has a receptacle 23 for the cross bar, which is formed as a U-shaped recess. In this recess, the cross bar is then inserted and the fastening screws (here a grub screw) screwed into the thread 27.
  • a groove 24 is provided in the the bearing element 40 is used.
  • the groove also has flat surfaces. The groove preferably runs circumferentially and corresponds substantially to the shape of the bearing element 40, both in the circumferential direction, as well as in cross section.
  • the bearing member 40 is formed as a ring or part-circular ring, the cross-section of the groove is unimportant, since the positioning of the abutment surfaces 47 for the flattened portions 17 of the screw head are held in position by the ring shape.
  • the bearing element is not formed at least semicircular, it is particularly advantageous for shorter bearing elements, which are used only on one side of the receiving element, when the positioning of the flat abutment surface over the cross section of the bearing element and the groove.
  • a substantially square or rectangular cross section is preferably suitable, but it may also be an oval cross-section or another shape which can provide a predetermined position of the bearing element 40 in the groove.
  • the bearing element 40 is preferably designed as a ring with at least one slot or partial ring, so that the bearing element 40 can be resiliently compressed and can be inserted into the groove of the receiving element 20.
  • this can also be made possible, for example, by changing the material or the material property (for example the thickness).
  • a closed ring can be sufficiently squeeze so that it can be inserted into the inner groove. The insertion can be done from above or from below. If the bearing member 40 is annular, it can not fall out of the circumferential groove.
  • the bearing member 40 can not rotate in the groove in the circumferential direction of the receiving element, the groove in the receiving element 20 is preferably not fully executed, but only according to the dimensions of the bearing member 40.
  • the bearing member 40 also has another flat surface 43rd on, which cooperates with the flat groove bottom of the groove 24 in the receiving element 20.
  • the bearing element 40 is preferably U-shaped, so that the two substantially parallel limbs of the "U” can also prevent the bearing element 40 from rotating in the groove 24 if the groove 24 is nevertheless formed completely in the receiving element 20 two substantially parallel legs and their vertical outer surfaces 43, the bearing member 40 can no longer rotate in the groove 24 in the circumferential direction.
  • the bearing element 40 can also be designed as a simple pin (straight or arcuate).
  • the bearing element 40 has at least one flattened side 47, which cooperates with the flattened region 17 of the screw head 18 and ensures pivoting in only a desired plane of the bone screw. The fact that the bearing element rests flat against the planar region of the screw head, a pivoting in other planes than the desired is not possible even with minor inaccuracy.

Landscapes

  • Health & Medical Sciences (AREA)
  • Orthopedic Medicine & Surgery (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Neurology (AREA)
  • Surgery (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Engineering & Computer Science (AREA)
  • Biomedical Technology (AREA)
  • Nuclear Medicine, Radiotherapy & Molecular Imaging (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)

Abstract

L'invention concerne un élément d'ancrage osseux monoplan (10), comprenant une vis d'ancrage (12) munie d'un filetage osseux (14) et d'une tête de vis (18) qui est aplatie au moins d'un côté (17), un élément de réception (20) présentant un trou de passage qui se rétrécit dans une zone inférieure (21) et dans lequel peut être logée la vis d'ancrage (12), et deux épaulements (25, 26) se prolongeant vers le haut et comprenant un profil taraudé (27) dans une zone supérieure, conçu pour le vissage d'une vis de fixation, l'élément de réception (20) présentant dans la zone de siège de la tête de vis d'ancrage (18) une rainure intérieure (24) située au moins en partie en périphérie, et un élément de palier (40) pour l'insertion dans la rainure intérieure (24) de l'élément de réception (20), l'élément de palier (40) étant aplati au moins en partie d'un côté (47), la rainure et l'élément de palier étant configurés pour être complémentaires de manière à ce que l'élément de palier soit placé en une position prédéterminée dans la rainure.
EP16718268.2A 2015-06-01 2016-04-08 Élément d'ancrage osseux monoplan Withdrawn EP3302323A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP15170172.9A EP3100691B1 (fr) 2015-06-01 2015-06-01 Élément d'ancrage d'os uniplanaire
PCT/EP2016/057810 WO2016192877A1 (fr) 2015-06-01 2016-04-08 Élément d'ancrage osseux monoplan

Publications (1)

Publication Number Publication Date
EP3302323A1 true EP3302323A1 (fr) 2018-04-11

Family

ID=53276775

Family Applications (2)

Application Number Title Priority Date Filing Date
EP15170172.9A Active EP3100691B1 (fr) 2015-06-01 2015-06-01 Élément d'ancrage d'os uniplanaire
EP16718268.2A Withdrawn EP3302323A1 (fr) 2015-06-01 2016-04-08 Élément d'ancrage osseux monoplan

Family Applications Before (1)

Application Number Title Priority Date Filing Date
EP15170172.9A Active EP3100691B1 (fr) 2015-06-01 2015-06-01 Élément d'ancrage d'os uniplanaire

Country Status (4)

Country Link
US (1) US10251677B2 (fr)
EP (2) EP3100691B1 (fr)
AU (1) AU2016270183B2 (fr)
WO (1) WO2016192877A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2757988A4 (fr) * 2009-06-15 2015-08-19 Jackson Roger P Dispositif d'ancrage osseux polyaxial doté d'une tige à enclenchement par pression et insert à ailettes à pince de compression à ajustement par friction
EP2664292A1 (fr) 2010-11-02 2013-11-20 Jackson, Roger P. Ancrage osseux polyaxial avec élément de rétention non rotatif et tige fixée par pression
DE102016114266B4 (de) * 2016-08-02 2018-02-15 Silony Medical International AG Polyaxialpedikelschraube

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5891145A (en) * 1997-07-14 1999-04-06 Sdgi Holdings, Inc. Multi-axial screw
US20140121703A1 (en) * 2012-10-31 2014-05-01 Roger P. Jackson Polyaxial bone anchor with pop-on multi-thread shank, some with diametric interference fit inserts
DE602006009682D1 (de) 2006-11-17 2009-11-19 Biedermann Motech Gmbh Knochenverankerungsvorrichtung
US8603145B2 (en) * 2008-12-16 2013-12-10 Zimmer Spine, Inc. Coaxially lockable poly-axial bone fastener assemblies
EP2757988A4 (fr) * 2009-06-15 2015-08-19 Jackson Roger P Dispositif d'ancrage osseux polyaxial doté d'une tige à enclenchement par pression et insert à ailettes à pince de compression à ajustement par friction
US9044272B2 (en) * 2009-11-09 2015-06-02 Ebi, Llc Multiplanar bone anchor system
US8986349B1 (en) * 2009-11-11 2015-03-24 Nuvasive, Inc. Systems and methods for correcting spinal deformities

Also Published As

Publication number Publication date
AU2016270183B2 (en) 2018-07-19
EP3100691B1 (fr) 2019-11-27
AU2016270183A1 (en) 2018-01-04
US20180161072A1 (en) 2018-06-14
US10251677B2 (en) 2019-04-09
EP3100691A1 (fr) 2016-12-07
WO2016192877A1 (fr) 2016-12-08

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