Surgery – Instruments – Orthopedic instrumentation
Patent
1996-01-29
1998-02-03
Buiz, Michael
Surgery
Instruments
Orthopedic instrumentation
606 61, 606 70, 606 72, 606 73, A61B 1758
Patent
active
057138982
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to an orthopedic surgical holding device for a correcting rod, having a bone plate which can be fastened on the bone, a receiver device for the correcting rod and a fixing device for maintaining the correcting rod in the receiver device.
BACKGROUND OF THE INVENTION
Numerous orthopedic surgical holding devices are known. As a rule, bone screws are employed for the fixing of individual bones in cases of deformations or fractures, which are screwed into the bones or bone segments and are connected with each other by means of correcting rods. As a rule, these bone screws consist of a threaded shaft and a screw head, wherein the threaded shaft is screwed into the bone until the screw head rests on the surface of the bone. This position of the bone screw is desirable because in this position it is possible to transfer maximal tension and pressure forces as well as moments to the bone. Since, as a rule, the screw head of the bone screw is embodied as a fork head, the bone screw must be rotated to a position in which the groove between legs of the fork head is oriented in the direction of the correcting rod to be received. However, because of this requirement it is not always assured that the bone screw is screwed completely in until the screw head rests on the bone surface. Depending on the thread pitch, the screw head is at a more or less large distance from the bone surface, because of which on the one hand the force of the tension and pressure forces is reduced and, on the other hand, the danger of damage to the bone during force peaks is increased.
If there is a bone plate between the screw head and the bone, and if this bone plate is also fixed via the bone screws, it is not always assured that the bone plate, which has the function of evenly distributing the forces acting on the bone screw, is always pressed by means of the bone screw free of play and resting flush against the surface of the bone. If the bone plate rests against the bone with play, there is even the danger of irritation of the bone, which slows down the healing process. The bone plate is fixed without play on the bone by the screw head of the bone screw only when the desired turning position of the bone screw, which depends on the orientation of the correcting rod, is accidentally taken up at the time the maximum screw-in depth has been reached.
OBJECT AND SUMMARY OF THE INVENTION
It is therefore an object of the present invention to further develop a holding device of the above mentioned type so that by means of it the bone plate rests without play against the bone, regardless of the rotated position of the receiver device for the correcting rod.
This object is attained in accordance with the present invention in that the bone plate can be fixed independently of the receiver device and has a bearing for the receiver device, and in that the receiver device can be pushed into the bearing from the proximal side and in the course of this extends through the bone plate and extends beyond it on the distal side for receiving the correcting rod.
By means of the embodiment in accordance with the present invention of the holding device, wherein the bone plate can be fixed on the bone independently of the receiver device which, for example, takes place via two or more screws, the advantage is gained that the correcting forces or moments are transmitted free of play from the bone plate to a large area of the bone. Since the fixing of the bone plate is independent of the receiver device, the position or the orientation of the correcting rod is of no consequence.
The receiver device is connected with the bone plate by insertion from the proximal side, i.e. from the side which rests against the surface of the bone, and is held by a bearing of the bone plate. The receiver device extends beyond the distal side of the bone plate and can receive the correcting rod there. In an advantageous manner the receiver device is disposed rotatable in the bearing over a plurality of steps or continuously. By m
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Rehder Gunther
Schafer Bernd
Stucker Ralf
Buiz Michael
SCHAFER micomed GmbH
Woo Julian W.
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