DE2710740B1

DE2710740B1 - Tool for deforming bone plates and process for their manufacture

Info

Publication number: DE2710740B1
Application number: DE19772710740
Authority: DE
Inventors: Leu Beat Ernst; Heinz Prof Mittelmeier; Heinz Moser
Original assignee: Osteo AG
Current assignee: Osteo AG
Priority date: 1977-03-11
Filing date: 1977-03-11
Publication date: 1978-03-23
Also published as: DE2710740C2

Description

Aus Fig. 1 ersieht man den Aufbau des Werkzeuges 1 mit dem längeren Arm 2 und dem kürzeren Arm 3. Ein Arm besteht aus einem stimmgabelartigen Teil 4, respektive 5, die an den mit 6 angedeuteten Schweißstellen unter einen Winkel w von 1400 zusammengeschweißt sind, wobei die beiden stimmgabelartigen Teile ungleiche Länge aufweisen. Auf diese stimmgabelartigen Teile sind die Rohrstücke 7 respektive 8 aufgesteckt und an beiden Enden miteinander schutzgasverschweißt. Die beiden Enden werden nach dem Verschweißen unter einem bestimmten Winkel, beispielsweise 30°, abgeschrägt und anschließend elektro lytisch poliert. Diese Abschrägungen 9 bzw. 10 verhindern beim Biegen von kleinen Platten oder von Winkelplatten eine gegenseitige Behinderung. Wie aus den F i g. 1 oder 3 und 4 ersichtlich ist, weisen die beiden Aussparungen an den stirnseitigen Enden der Arme verschiedene Querschnitte auf, wobei die Aussparung 11 am längeren Arm einen größeren Querschnitt als die Aussparung 12 am kürzeren Arm aufweist. Der Querschnitt der Aussparungen entspricht den Profilen der am häufigsten verwendeten Knochenplatten. Um ein besseres Handhaben und einen guten Griff des Werkzeuges zu gewährleisten, sind am Außenumfang der Rohrstücke 7 und 8 umlaufende Rillen 13 angebracht. An der Basis der stimmgabelartigen Teile 4 und 5. nahe der Knickstelle 6, sind zwei querlaufende ungleichgroße Öffnungen angebracht, wobei die Öffnung 14 im längeren Arm einen größeren Querschnitt aufweist als die Öffnung 15 am kürzeren Arm, wobei auch diese beiden verschiedenen Querschnitte den beiden gebräuchlichsten Knochenplatten angepaßt sind. From Fig. 1 you can see the structure of the tool 1 with the longer one Arm 2 and the shorter arm 3. One arm consists of a tuning fork-like part 4, respectively 5, which at the weld points indicated by 6 at an angle w from 1400 are welded together, with the two tuning fork-like parts unequal Have length. On these tuning fork-like parts, the pipe sections 7 are respectively 8 attached and inert gas welded to each other at both ends. The two ends are after welding at a certain angle, for example 30 °, beveled and then electrolytically polished. These bevels 9 or 10 prevent mutual bending when bending small plates or angle plates Disability. As shown in FIGS. 1 or 3 and 4 can be seen, indicate the two Recesses at the front ends of the arms on different cross-sections, the recess 11 on the longer arm having a larger cross-section than the recess 12 has on the shorter arm. The cross-section of the recesses corresponds to the profiles of the most commonly used bone plates. To a better handling and one To ensure a good grip of the tool, are on the outer circumference of the pipe sections 7 and 8 circumferential grooves 13 attached. At the base of the tuning fork-like parts 4 and 5. near the kink 6, there are two transverse openings of different size attached, wherein the opening 14 in the longer arm has a larger cross-section than the opening 15 on the shorter arm, where also these two different ones Cross-sections are adapted to the two most common bone plates.

In den Fig.5, 6 und 7 sind einige Beispiele für die paarweise Verwendung des oben beschriebenen Werkzeugs dargestellt. In F i g. 5 erkennt man, daß die Wahl eines stumpfen Winkels von etwa 140 zwischen den beiden Armen und die ungleiche Länge dieser Arme beim Schränken einer Knochenplatte 16 einerseits eine sehr große Bewegungsfreiheit für die Hände und andererseits einen genügend großen Hebelarm gewährleistet, denn bei symmetrischer Ausgestaltung des Werkzeuges wäre die Gefahr einer gegenseitigen Behinderung, insbesondere bei kurzen Knochenplatten, wesentlich größer. Insbesondere aus F i g. 6 erkennt man, daß die Abschrägung 9 respektive 10 an den Stirnseiten der Arme eine gegenseitige Behinderung beim Biegen von Winkelplatten 17 oder, wie in F i g. 7, von kurzen Platten praktisch ausschließt, wobei die Verhältnisse in diesen Zeichnungen der besseren Übersicht wegen nicht maßstäblich gezeichnet sind. In Figures 5, 6 and 7 are some examples of paired use of the tool described above. In Fig. 5 one realizes that the choice an obtuse angle of about 140 between the two arms and the unequal The length of these arms when setting a bone plate 16 is on the one hand a very large one Freedom of movement for the hands and, on the other hand, a sufficiently large lever arm guaranteed, because with a symmetrical design of the tool there would be a risk mutual hindrance, especially in the case of short bone plates greater. In particular from FIG. 6 it can be seen that the bevel 9, respectively 10 on the end faces of the arms a mutual hindrance when bending angle plates 17 or, as in FIG. 7, practically excludes short plates, the Conditions In these drawings, for the sake of clarity, they are not drawn to scale are.

Das weiter oben beschriebene Herstellungsverfahren ist besonders günstig, doch ist es, zumindest theoretisch. The manufacturing process described above is special cheap, but it is, at least in theory.

denkbar, das Werkzeug aus einem oder zwei vollen Rohren herzustellen und die Aussparungen und Öffnungen herauszufräsen. Es können selbstverständlich weitere Öffnungen für eine größere Vielfalt von Plattenabmessungen angebracht werden, auch ist es denkbar, anstatt eine zwei gekreuzte Aussparungen mit verschiedenen Abmessungen an der Stirnseite anzubringen. Nach Versuchen wurde ein Winkel zwischen beiden Armen in einem Bereich von 135 bis 145#C als besonders günstig gefunden, mit Maximum bei 140o.conceivable to manufacture the tool from one or two full tubes and mill out the recesses and openings. It can of course additional openings can be made for a greater variety of panel dimensions, It is also conceivable instead of having two crossed recesses with different ones Dimensions to be attached to the front. After trying, an angle was found between both arms in a range from 135 to 145 # C found to be particularly favorable, with a maximum at 140o.

doch ist das Werkzeug grundsätzlich nicht an diesen Winkelbereich gebunden, es sind auch andere stumpfe Winkel denkbar.but the tool is basically not at this angle range bound, other obtuse angles are also conceivable.

Claims

Claims: 1. Tool for deforming bone plates, characterized in that it is used, in particular in pairs, both for the Bending is also suitable for setting and consists of a tube (1). the has two arms (2, 3) of unequal length, enclosing an obtuse angle (w), the end face each with a recess (11, 12) and in the area of the bend (6) each one have transverse opening (14, 15) for receiving a bone plate (16, 17), the recess (11) and the opening (14) on the longer arm (2) being larger Have cross-section than the recess (12) and the opening (15) on the shorter arm (3) 2. Tool according to claim 1, characterized in that the angle between both arms is 1350 and 1450.

3. Tool according to claim 2, characterized in that the angle between the two arms is about 140 °.

4. Tool according to one of claims 1 to 3, characterized in that that the ends have a bevel (9, 10) 5. Tool according to one of the claims 1 to 4, characterized in that the arms have circumferential grooves (13).

6. A method for producing a tool according to claim 1, characterized marked. that two tuning gahel-like parts (4, 5) at their bases under one butt angles are welded together, the legs of one part being a greater length and greater distance from one another than those of the the other part, and that a piece of pipe (7, 8) is pushed over the legs and is welded to the part at both ends.

7. The method according to claim 6, characterized in that the two Ends beveled after welding at an angle of about 300 and then be electrolytically polished.

The present invention relates to a tool for deforming of bone plates, for example straight bone plates and angle plates and to a process for its manufacture.

As a rule, bone plates must be adapted to the curvature of the bone these panels must either be bent and / or set. In order to bend the plates, it is previously known to use standing bending instruments in surgery that work with a three-point support. Thereby the plates placed on two spaced supports and in the middle by means of an as long lever-acting f! acheisen (third edition) compressed. For cupboarding it is known, so-called bending irons, d. H. two flat irons with cutouts to use.

The previously known instruments have the disadvantage that they are only for some kind of deformation are suitable. In contrast, it is the task of the present Invention of specifying a tool. with which all the necessary deformations such as bending and cabinets can be done that for any type of panels like straight and Angle plates with different profile thicknesses is suitable and safe with the can be worked.

The object is achieved with a tool that is characterized by is that it is used, especially in pairs, both for bending and for the cabinet is suitable and consists of a tube that is two unequal lengths. has an obtuse angle enclosing arms, each of which has a recess at the end and in the area of the kink each have a transverse opening to accommodate one Have bone plate. wherein the recess and the opening on the longer arm one have a larger cross-section than the recess and opening on the shorter arm.

The method for manufacturing the tool is characterized. that two tuning fork-like parts are welded together at their bases at an obtuse angle be, with the legs of a part a greater length and a greater distance each other than those of the other part, and that over the legs a piece of pipe is pushed and welded to the part at both ends.

The invention is explained below with reference to a drawing of exemplary embodiments explained in more detail.

Fig. 1 shows a longitudinal section of a bending tube, Fig. 2 shows a Top view of the central area of the tube of Fig. 1, Fig.3 shows in an enlarged Scale shows a cross section according to the line 111-111 of Fig. 1, Fig. 4 shows in an enlarged manner Scale the front of the shorter arm, Fig. 5 shows the use of the in pairs Tool for setting a straight bone plate, FIG. 6 shows the application a pair of tools for bending an angle plate and FIG. 7 shows the application of a pair of tools when bending a straight bone plate.