WO2007098631A2 - Fixateur externe - Google Patents

Fixateur externe Download PDF

Info

Publication number
WO2007098631A2
WO2007098631A2 PCT/CH2007/000105 CH2007000105W WO2007098631A2 WO 2007098631 A2 WO2007098631 A2 WO 2007098631A2 CH 2007000105 W CH2007000105 W CH 2007000105W WO 2007098631 A2 WO2007098631 A2 WO 2007098631A2
Authority
WO
WIPO (PCT)
Prior art keywords
fixator
clamping
rider
rod
ball
Prior art date
Application number
PCT/CH2007/000105
Other languages
German (de)
English (en)
Other versions
WO2007098631A3 (fr
Inventor
Oskar E. Illi
Original Assignee
Illi Oskar E
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 Illi Oskar E filed Critical Illi Oskar E
Priority to EP07701905A priority Critical patent/EP1991142A2/fr
Publication of WO2007098631A2 publication Critical patent/WO2007098631A2/fr
Publication of WO2007098631A3 publication Critical patent/WO2007098631A3/fr

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
    • A61B17/60—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 for external osteosynthesis, e.g. distractors, contractors
    • A61B17/64—Devices extending alongside the bones to be positioned
    • A61B17/6466—Devices extending alongside the bones to be positioned with pin-clamps movable along a solid connecting rod
    • A61B17/6483—Devices extending alongside the bones to be positioned with pin-clamps movable along a solid connecting rod the connecting rod having a non-circular section
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
    • A61B2017/00831—Material properties
    • A61B2017/00902—Material properties transparent or translucent
    • A61B2017/00915—Material properties transparent or translucent for radioactive radiation

Definitions

  • the present invention relates to a fixator for external repositioning and stabilization of bone fragments, comprising a fixator rod, a clamping unit for clamping support of two Schanz 'see screws or nails, wherein the clamping unit is connected to a rider member which is displaceable on the fixator and around the Fixateurstablangsach.se is pivotable.
  • External Fixteure of the aforementioned type are known in various embodiments. Typical examples of this type are shown, for example, in WO 2004/045451 (Amei Technologies Inc.), German Patent Application DE-A-3614305 or EP-AO '695' 538. Finally, EP-A-0'630 '214 also shows a external fixator of the type mentioned. Of the documents mentioned, with the exception of DE-A-3614305, all documents show external fixators which are suitable for use in hand or foot surgery. A basic problem for external fixators in this area of application is on the one hand the required smallness of the Construction and on the other hand, the X-ray permeability to control the reduction and retention. In addition, the majority of known constructions is extremely complicated and contains a large number of different components.
  • the object of the present invention is to provide an external fixator for the hand or foot surgery, which has a particularly simple structure, is correspondingly inexpensive to produce and thus can be used for the realistically required disposable use.
  • Another object of the present invention is to disclose a solution which is also suitable for being configured with a fixator rod made of X-ray permeable material.
  • the first main task of a simple and inexpensive construction solves the invention by means of an external fixator, which has the features of the preamble of claim 1 and is characterized in that the fixator rod has a non-round cross section and the rider part comprises a housing by a ball stored is, which is penetrated by the fixator rod and wherein the clamping unit consists of an integrally connected to the rider part.
  • FIG. 1 shows an external fixator consisting of a fixator rod and two fixation units
  • FIG. 2 shows a plan view of a fixing unit according to FIG. 1, while FIG
  • Figure 3 illustrates such a fixing unit in the side view, wherein the viewing direction is parallel to the longitudinal axis of the fixator rod.
  • Figure 4 shows a central cross section through a
  • Fixation unit parallel to the longitudinal axis of the fixator rod.
  • the external fixator according to the invention which has been developed in particular for hand and foot surgery, is denoted overall by 1. It includes on the one hand
  • Fixator bar 3 on which at least two fixation units 2 are held displaceable and fixable.
  • Each fixing unit 2 comprises in each case a clamping part 5 and a rider part 6.
  • the rider part 6 has a housing 7 which, however, by no means necessarily has an external annular shape, in particular a circular-cylindrical annular shape and whose inner surface is spherically curved to receive a ball 8 Ball 8 is penetrated by a diametrically this piercing opening 10.
  • the diametrical opening 10 is designed in cross section corresponding to the cross section of the fixator rod 3. In order to prevent a rotary movement of the fixator rod 3 in the diametrical opening 10, it is advantageous to give the cross section of the diametrical opening 10 a non-round shape. In the present example, this diametrical opening 10 is provided with a rectangular cross section and, accordingly, the fixator rod 3 is provided with such a cross section.
  • the ball 8 in the housing 7 of the rider portion 6 is preferably formed of two hemispheres 8 'and 8''. Accordingly, a separating gap 9 remains between the two hemispheres. The inner region of the separating gap 9, which extends over the diametrical opening, is widened so that here a deformation space 11 is created.
  • the housing 7 of the rider part 6 has a threaded hole 13, which is arranged in the assembled state of the external fixator so that this runs with its central axis perpendicular to the plane passing through the separating gap 9 of the two Hemisphere 8 'and 8''is defined. In threaded hole 13 a locking screw 14 is mounted, which is provided here with a hexagon socket.
  • the reaction force leads to a slight deformation of the housing 7 of the rider part, so that on the one hand by the locking screw 14, the two hemispheres 8' and 8 '' are compressed and This thus secure the fixator 3 against a transverse displacement, while at the same time by the deformation of the housing 7, a rotation of the ball 8 in the rider part 6 is impossible.
  • the deformation space 11 simultaneously increases the deformability of the ball 8 and increases the specific surface pressure between the two hemispheres 8 'and 8''.
  • the housing 6 and the two hemispheres 8 'and 8''elastically deformed back and the fixator rod 3 can be translationally move in the diametrical opening 10, while at the same time the entire fixing unit 2 in all directions or can twist or swivel to the fixator 3.
  • the system is designed so that even with not tightened locking screw 14, the two hemispheres 8 'and 8''with a small bias to each other and press on the fixator rod, so that these parts are indeed relative to each other displaced or rotated or pivoted
  • these movements are all self-locking and only at Application of a certain force to be applied by the surgeon relative to each other are movable.
  • the threaded hole 13 has a sufficient length to apply a high force by means of the locking screw 14 on the underlying hemisphere 8 ', the annular housing 7 of the rider portion 6 in the region of the threaded hole 13 has a housing thickening 15.
  • a clamping part 5 is formed on the rider portion 6.
  • This clamping member 5 has a plate-like shape and is practically tangentially integrally formed on the annular housing 7 of the rider portion 6.
  • the thickness of the plate 16 is one and a half to twice as thick as the largest diameter of the usable Schanz 'see screws or nails.
  • the maximum diameter of such Schanz screws or nails is 2 - 2.4 mm, while the thinnest to be used screws are approximately between 1 - 1.5 mm. In particular, these areas will vary depending on whether the external fixator is for hand or foot surgery, or whether the patient is a child or an adult patient.
  • the plate 16 of the clamping member 5 has a longitudinal orientation which is perpendicular to the central diametrical plane of the annular housing 7 of the rider portion 6.
  • the length of this plate 16 of Clamping part 5 is greater than the width of the annular housing 7 of the rider part. In this way, a greater relative distance between the two Schanz 'see screws allows, namely in particular a size of, for example, 10 - 15 mm, although the width of the annular housing 7 of the rider portion only has a width of about 5 - 8 mm.
  • a clamping cap 18 is slipped over the plate 16 of the clamping member 5.
  • This clamping cap 18 has substantially the shape of a U-profile, wherein the two side legs 19 rest against the lateral longitudinal edges of the plate 16.
  • conical receiving slots 21 are formed, which extend from the top surface 20 of the terminal cap 18 to its lower ends conically. This conical extension of the receiving slots 21 serves to clamp Schanz 'see screws with different diameters. Accordingly, the conical receiving slots 21 are designed so that they are in their narrowest area near the top surface 20 smaller than the smallest diameter of the male Schanz 'see screws or nails, while the lowest widest opening is larger than the largest male Schanz' see screws or nails.
  • a centric hole in the clamping cap 18 allows a clamping screw 22 through the clamping cap 18th through which opens into a threaded hole in the plate 16.
  • the clamping screw 22 is used solely for the clamping of the Schanz 'see screws 4 or nails in a desired relative position on the fixing unit. 2
  • the entire external fixator 1 with the exception of the two screws 14 and 22 and the Schanz 'see screws 4 or nails can be made entirely of plastic.
  • the one-piece manufactured clamping and riding parts 5 and 6 are made of metal. This allows higher powers to be transmitted.
  • the entire external fixator can be made smaller in turn.
  • the clamping part and the rider part 5 or 6 can be made as a metal casting or metal diecasting. This allows a very reasonably priced production.
  • a high-strength plastic possibly reinforced with glass fibers.
  • the fixator rod 3 from a radiolucent material.
  • a carbon rod Preferably, one will use a carbon rod.
  • Fixateurstäben of carbon fiber material is advantageously used a fixator rod with a rectangular cross-section.
  • the longer edge of the cross section should be aligned parallel to the direction of Schanz 'see screws or nails.
  • the larger cross-section is used to accommodate the flexion and extension movements of the hand, as these movements are exerted with greater force and accordingly blocked due to the larger diameter accordingly.
  • the abduction and adduction movements exerted with substantially smaller forces are then absorbed by the fixator rod in the direction of the smaller diameter. If this small movements can take place anyway, this is not only unproblematic but almost desirable because this micro-movements in the fracture area can occur, which are known to promote the healing process.
  • the press-on clamping cap should never be made of plastic.
  • a solution of metal in which case a medical steel in particular comes into question.
  • the terminal cap can also be made of a relatively hard aluminum. If in such a clamping cap made of an aluminum alloy
  • Another advantage of the inventive fixator is the extremely simple application.
  • the surgeon can practically use the fixing unit 2 directly before placing on the fixator 3 as a jig, he can monitor the repositioning of the fracture parts during setting of the external fixator by means of an X-ray machine, without him while the fixator rod is in the way. If the surgeon has drilled the holes for setting the Schanz screws, he screws in the Schanz screws, puts the fixation unit on top with the already used fixator rod. He is still completely free to perform all pivoting and shifting movements. As soon as the external fixator 1 is put on, it pulls

Landscapes

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

Abstract

La présente invention concerne un fixateur externe constitué d'une tige de fixateur (3) sur laquelle deux unités de fixation (2) peuvent être fixées dans une position relative quelconque. Les unités de fixation (2) sont constituées d'un élément de serrage (5) dans lequel des vis de Schanz (4) sont maintenues serrées et un élément curseur (6) doté d'un boîtier (7) dans lequel est logée une bille (8). On utilise une vis de serrage (22) pour fixer les vis de Schanz (4) à l'élément de serrage (5) tandis qu'une vis de butée (14) appuie sur la bille (8) et ainsi fixe la position relative des vis de Schanz (4) par rapport à la tige de fixateur (3) tant dans la direction transversale que dans toute position angulaire par rapport à la tige de fixateur (3). Tous les éléments étant réalisés sous forme d'éléments de pression en matière plastique ou en métal, ils sont adaptés à la production en série. On obtient ainsi un fixateur externe exceptionnellement bon marché, convenant à un usage unique et d'utilisation facile pour l'opérateur.
PCT/CH2007/000105 2006-03-03 2007-03-01 Fixateur externe WO2007098631A2 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP07701905A EP1991142A2 (fr) 2006-03-03 2007-03-01 Fixateur externe

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH00338/06A CH714281B1 (de) 2006-03-03 2006-03-03 Externer Fixateur zur Repositionierung und Stabilisierung von Knochenfragmenten.
CH338/06 2006-03-03

Publications (2)

Publication Number Publication Date
WO2007098631A2 true WO2007098631A2 (fr) 2007-09-07
WO2007098631A3 WO2007098631A3 (fr) 2007-10-18

Family

ID=38294227

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CH2007/000105 WO2007098631A2 (fr) 2006-03-03 2007-03-01 Fixateur externe

Country Status (3)

Country Link
EP (1) EP1991142A2 (fr)
CH (1) CH714281B1 (fr)
WO (1) WO2007098631A2 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105877825A (zh) * 2016-05-03 2016-08-24 中国人民解放军北京军区总医院 战时外固定架

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3614305A1 (de) 1986-04-29 1987-11-12 Baehr Geb Green Judith M Aeusserlich anwendbarer fixateur
FR2665353A1 (fr) 1990-08-03 1992-02-07 Pinaud Jean Claude Fixateur externe pour la reduction des fractures du poignet.
EP0695538A1 (fr) 1994-08-05 1996-02-07 POHL, Anthony Philip Fixateur externe pour emploi militaire
EP0699419A2 (fr) 1994-09-03 1996-03-06 Wolfgang Dr. Veith Fixateur ostéosynthétique
WO2004045451A2 (fr) 2002-11-15 2004-06-03 Amei Technologies Inc. Appareil et procede pour maintenir les os en position de guerison

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH303453A (fr) * 1952-05-13 1954-11-30 Raoul Dr Hoffmann Fixateur, notamment pour le traitement des fractures des os.
DE4333913C2 (de) * 1992-10-09 1997-11-20 Link Johs Sonor Gmbh Einstellvorrichtung an längen- und/oder neigungsverstellbaren Haltern, insbesondere für Percussions-Musikinstrumente
US6482206B2 (en) * 2001-02-22 2002-11-19 Biomet, Inc. Method and apparatus for external fixation of bones
WO2005053549A1 (fr) * 2003-11-25 2005-06-16 Instituto Tecnologico De Canarias, S.A. (Itc) Dispositif de fixation externe pour le poignet

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3614305A1 (de) 1986-04-29 1987-11-12 Baehr Geb Green Judith M Aeusserlich anwendbarer fixateur
FR2665353A1 (fr) 1990-08-03 1992-02-07 Pinaud Jean Claude Fixateur externe pour la reduction des fractures du poignet.
EP0695538A1 (fr) 1994-08-05 1996-02-07 POHL, Anthony Philip Fixateur externe pour emploi militaire
EP0699419A2 (fr) 1994-09-03 1996-03-06 Wolfgang Dr. Veith Fixateur ostéosynthétique
WO2004045451A2 (fr) 2002-11-15 2004-06-03 Amei Technologies Inc. Appareil et procede pour maintenir les os en position de guerison

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105877825A (zh) * 2016-05-03 2016-08-24 中国人民解放军北京军区总医院 战时外固定架

Also Published As

Publication number Publication date
EP1991142A2 (fr) 2008-11-19
WO2007098631A3 (fr) 2007-10-18
CH714281B1 (de) 2019-04-30

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