DE2125556B1

DE2125556B1 - Connector for kneecap fractures

Info

Publication number: DE2125556B1
Application number: DE19712125556D
Authority: DE
Inventors: Artur 7241 Tumlingen; Müller Jean-Nicolas Straßburg Fischer (Frankreich); Kilgus, Theo, 7290 Freudenstadt
Original assignee: Individual
Current assignee: Individual
Priority date: 1971-05-22
Filing date: 1971-05-22
Publication date: 1972-07-06

Description

in weiterer vorteilhafter Ergänzung der Erfindung können die Gegenlager als Art Anker mit mindestens einem Ankerarm ausgebildet sein. Die Ankerarme dringen beim Zusammenziehen der Gegenlager in den Knochen ein und schaffen somit eine feste Verbindung der Gegenlager mit den Knochenbruchstükken. Die Ankerarme können auch so zurechtgebogen werden, daß sie solche Knochensplitter erfassen können, die an sich beim Zusammenziehen der beiden Gegenlager nicht erfaßt werden würden. Es ist darüber hinaus möglich, auch für die Aufnahme der Ankerarme Bohrungen im Knochen vorzusehen. in a further advantageous addition to the invention, the counter bearings be designed as a kind of anchor with at least one anchor arm. The anchor arms penetrate when pulling together the counter bearings into the bone and thus create a solid Connection of the counter bearing with the bone fragments. The anchor arms can also be bent so that they can grasp such fragments of bone, the would not be detected when the two counter bearings are drawn together. It It is also possible to drill holes in the bone to accommodate the anchor arms to be provided.

Nach einer letzten Ausgestaltung der Erfindung können bei mindestens zwei Ankerarmen diese durch Aufspalten des Schaftes des Gegenlagers und durch Umbiegen gebildet sein. Bei Kniescheibensplitterbrüchen reicht oftmals ein Ankerarm an jedem Gegenlager nicht aus, um alle Knochensplitter zu erfassen. Es werden dann mehrere Ankerarme erforderlich, die nach dem soeben geschilderten Verfahren einfach und billig hergestellt werden können. According to a final embodiment of the invention, at least two anchor arms this by splitting the shaft of the counter bearing and bending it be educated. In the case of fractured kneecap fragments, one anchor arm is often enough on each one Counter bearing is not sufficient to capture all bone fragments. Then there will be several Anchor arms required, which are simple and easy after the method just described can be manufactured cheaply.

In der Zeichnung sind Ausführungsbeispiele der Erfindung dargestellt. Exemplary embodiments of the invention are shown in the drawing.

F i g. 1 zeigt das Verbindungselement, bei dem jedes Gegenlager je einen Ankerarm aufweist; F i g. 2 zeigt ein Gegenlager mit zwei Ankerarmen; F i g. 3 zeigt das in der Kniescheibe eingesetzte Verbindungselement. F i g. 1 shows the connecting element in which each counter bearing each has an anchor arm; F i g. 2 shows a counter bearing with two anchor arms; F i G. 3 shows the connector inserted in the kneecap.

Das Verbindungselement 1 nach F i g. 1 besteht aus zwei Gegenlagern 2 a, 2 b, die teleskopartig zusammenschiebbar sind. Beide Gegenlager 2 a, 2 b weisen je einen gebogenen Ankerarm 3 auf. Das eine Gegenlager 2 a ist mit einem quadratischen Schaft4 versehen, an den sich zum Aufschrauben einer Mutter 5, die sich an einer Unterlagsscheibe 6 abstützt, ein Gewindeabschnitt 7 anschließt. Auf diesen Schaft 4 ist das andere Gegenlager 2 b übergeschoben, das dazu einen entsprechend dem quadratischen Schaft 4 des anderen Gegenlagers 2 a hohlen Schaft 8 aufweist. The connecting element 1 according to FIG. 1 consists of two counter bearings 2 a, 2 b, which can be telescoped together. Both counter bearings 2 a, 2 b have a curved armature arm 3 each. The one counter bearing 2 a is with a square Shank4 provided, on which to screw a nut 5, which is on a Washer 6 is supported, a threaded section 7 connects. On this shaft 4, the other counter bearing 2 b is pushed over, the one corresponding to the square Shaft 4 of the other counter bearing 2 a has a hollow shaft 8.

In F i g. 2 ist eine andere Ausführungsform des Erfindungsgegenstandes dargestellt. Bei dieser Ausfüh- rungsform weisen die beiden Gegenlager 2 a, 2 b je zwei Ankerarme 3 auf, die durch Aufspalten des Schaftes der Gegenlager 2 a, 2 b und durch Umbiegen gebildet sind. Auch hier wiederum sind die beiden Gegenlager 2 a, 2 b teleskopartig zusammenschiebbar und können durch Aufschrauben einer Mutter 5 auf den Gewindeabschnitt 7 des einen Gegenlagers 2 a zusammengezogen werden. In Fig. 2 is another embodiment of the subject invention shown. With this execution Approximate shape have the two counter bearings 2 a, 2 b each two anchor arms 3, which by splitting the shaft of the counter bearings 2 a, 2 b and formed by bending. Here, too, are the two counter bearings 2 a, 2 b telescopic and can be screwed on a nut 5 are pulled together on the threaded portion 7 of a counter bearing 2 a.

In F i g. 3 ist das Verbindungselement 1 in der Kniescheibe 10 eingesetzt. Dazu muß zunächst in der Kniescheibe 10 etwa rechtwinklig zur Bruchfläche 11 ein Durchgangsloch 12 gebohrt werden, durch das das eine Gegenlager 2 a mit dem quadratischen Schaft 4 und dem sich daran anschließenden Gewindeabschnitt 7 durchgesteckt wird. Zur Erfassung der einzelnen Knochenbruchstücke 13 werden die Ankerarme3 entsprechend zurechtgebogen. Um das Montieren des Verbindungselementes 1 zu erleichtern, empfiehlt es sich, auch für die Ankerarme 3 Bohrungen 14 in den Knochenbruchstücken 13 vorzusehen. In Fig. 3, the connecting element 1 is inserted into the kneecap 10. For this purpose, a must first be in the kneecap 10 approximately at right angles to the fracture surface 11 Through hole 12 are drilled through which a counter bearing 2 a with the square Shank 4 and the adjoining threaded section 7 is pushed through. To capture the individual bone fragments 13, the anchor arms 3 are accordingly bent into shape. To facilitate the assembly of the connecting element 1, recommends it is advisable to provide bores 14 in the bone fragments 13 for the anchor arms 3 as well.

Auf den Schaft 4 des einen Gegenlagers 2 a wird nun das andere Gegenlager 2 b übergeschoben und beide mit einer auf den Gewindeabschnitt 7 aufschraubbaren Mutter 5 so lange zusammengezogen, bis sich die Knochenbruchstücke 13 an der Bruchfläche 11 berühren. Das erfindungsgemäße Verbindungselement 1 fixiert somit nach der Montage die einzelnen Knochenbruchstücke 13 in ihrer richtigen Lage und hält die Kniescheibe 10 trotz der an ihr angreifenden Kräfte zu einer Einheit zusammen. An den Bruchflächen 11 kann sich somit Kallus bilden, der es nach einiger Zeit erlaubt, das erfindungsgemäße Verbindungselementl aus der Kniescheibe 10 wieder zu entfernen.The other counter bearing is now on the shaft 4 of a counter bearing 2 a 2 b pushed over and both can be screwed onto the threaded section 7 with one Nut 5 contracted until the bone fragments 13 are on the fracture surface 11 touch. The connecting element 1 according to the invention thus fixes after assembly the individual bone fragments 13 in their correct position and holds the kneecap 10 despite the forces acting on it into a unity. At the fracture surfaces 11 can thus form callus, which after some time allows the inventive To remove the connecting element from the kneecap 10 again.

Claims

Claims: 1. Connecting element for kneecap fractures: turen, consisting of two displaceable and fixable in the axial direction of the connecting element Counter bearings, characterized in that one counter bearing (2 b) over the other Counter bearing (2a) with a thread (7) for screwing on a nut (5) and a polygonal, preferably square shaft (4) is provided, telescopic can be pushed on and for this purpose one corresponding to the polygonal, preferably square Shaft (4) of the other counter bearing (2a) has a hollow shaft (8).

2. Connecting element according to claim 1, characterized in that the counter bearings (2a, 2b) are designed as a type of anchor with at least one anchor arm (3) are.

3. Connecting element according to claim 2, characterized in that in the case of at least two anchor arms (3), this is done by splitting the shaft of the counter bearing and formed by bending.

The invention relates to a connecting element for kneecap fractures, consisting of two displaceable and fixable in the axial direction of the connecting element Counter bearings.

Contributes to the connection and cohesion of the bone fragments To date, wires have been used in a kneecap fracture. First you put in Wire band around the circumference of the kneecap. Starting from this wire band now more wires crossed over the front of the kneecap. There it is not possible to wrap the wires under tension around the kneecap the cohesion of the kneecap is very low and is not sufficient to absorb the tensile forces, triggered by the tendons and muscles attacking the kneecap, to be able to record. The necessary pressure on the fracture surfaces is also missing, which are necessary for rapid callus formation and thus also for rapid healing In order not to interfere with the sliding of the kneecap on the knee joint, must the wire band wrapped around the circumferential surface of the kneecap; the kneecap do not reach behind. As a result, however, the wire loop is held at the irregular one and partly inclined circumferential surface of the kneecap only very slightly. It exists therefore when the kneecap is stressed by the ligaments and muscles attacking it the risk that the wire loop slips off the peripheral surface.

From the German utility model 1830106 there is already a bone clamp known, the two similarly shaped, slidable and lockable There are strips that are provided with prongs bent in the same direction. However is this bone clamp not telescopic maneuverable, so that no possibility consists of pulling the bone fragments together and holding them together to keep them attached the fracture surface are pressed together to form callus.

The known bone clamp allows adjustment of its engagement width by moving the two strips. But this is only prior to inserting the bone clamp possible and no longer if it has already been engaged. As the well-known bone clamp also cannot be inserted into the bone, but only from the outside is applicable, a use for kneecap fractures is ruled out. The tendons and muscles attack namely on the front of the kneecap, so that a connection the bone fragments from the front with the known bone clamp not is possible.

The invention is therefore based on the object for herniated kneecaps to create an element that is easy to attach and that holds the broken bones can be contracted and held together to form callus.

According to the invention this is achieved in that the one counter bearing on the other counter bearing, the one with a thread for screwing on a nut and a polygonal, preferably square shaft is provided, telescopic can be pushed on and for this purpose one corresponding to the polygonal, preferably square The shaft of the other counter bearing has a hollow shaft.

To attach the connecting element according to the invention, first Drilled a hole roughly at right angles to the fracture surface through which one of the two counter bearings is pushed through. On the end of this abutment protruding from the borehole then the second counter bearing pushed over. The two will now have a mother The counter-bearing is pulled together until the bone fragments are on the fracture surface touch. It should be noted that when the bone fragments are pulled together there is no displacement in the sliding surface of the kneecap.

By adapting the cross-section of the sleeve-shaped counter bearing on the cross-section of the polygonal shaft of the other counter-bearing results an anti-twist device that ensures that the individual bone fragments that are firmly connected to the counter bearings after being contracted, after assembly of the connecting element according to the invention no longer around that of the counter bearings can rotate formed axis against each other.

The muscles and tendons attacking the kneecap run bones converging in the longitudinal direction aerim-joint and exert a tensile force on the kneecap. This pulling force is now provided by the two of them through a nut held together counter bearings added. At the breakpoints of the now relieved Callus can form immediately on the kneecap.