Surgery – Instruments – Orthopedic instrumentation
Patent
1998-06-11
2000-04-25
Buiz, Michael
Surgery
Instruments
Orthopedic instrumentation
606 72, A61B 1758
Patent
active
060539194
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention concerns a device for the fixation of bone fragments.
The device is particularly suitable for orthognatic corrections at the lower jaw.
BACKGROUND
In order to treat any malformations in the area of the jaw and face, osteotomies with subsequent relocation of the bone fragments are performed. To some extent, the process of fixation of the bone fragments thus obtained is difficult, since there are no congruent planes of bone after an osteotomy with relocation of the fragments has been performed. This situation is further aggravated in the case of lower-jaw osteotomies, since the position of the joint of the jaw, which is located in the proximal fragment should not be altered. These circumstances aggravate the performance of an accurately dimension-fitting osteosynthesis which must also be stable with regard to its function, which has been the objective aspired to for the past several years.
The disadvantage of all the already-known devices in this field, e.g. those according to the DE-C 23.40.880, lies in the fact that they are not sufficiently adaptable during the performance of an operation and that after the operation has been performed, they show practically no bending ability arising from the plate surface.
SUMMARY OF THE INVENTION
The invention aims to remedy these matters. It is the purpose of the invention to create a device for the fixation of bone fragments which, on the one hand, allows for adaptability during the performance of an operation when the bone fragments are adjusted in relation to each other, and which on the other hand allows for a certain flexibility of the device cross-wise to the plate surface.
The present invention comprises a bone fragment-fixing device including a longitudinal bone plate which is provided at each of its ends with at least one through-hole for receiving a screw and which is also provided with a central longitudinal extending in the direction of the longitudinal axis of the bone plate and having a length that is 45-60% of the total length of the bone plate. The device also includes a slide mounted on stems which laterally limit the central longitudinal hole. The slide is mounted on the stems in such a way that the slide is movable in the direction of the longitudinal axis of the plate. The slide has a longitudinal hole which extends cross-wise to the longitudinal axis of the plate.
In one embodiment, the width of the central longitudinal hole is 50-65% of the total width of the bone plate. According to another embodiment, the thickness of the bone plate amounts to 8-12% of the total width of the bone plate. In a final embodiment, the length of the longitudinal hole of the slide essentially corresponds to the width of the central longitudinal hole.
The invention also comprises a bone plate having first and second ends each provided with at least one through-hole for receiving a screw and a central longitudinal hole extending in the longitudinal axis of the bone plate and having a amounting to 45-60% of the total length of the bone plate. According to one embodiment, the width of the central longitudinal hole amounts to 50-65% of the total width of the bone plate. In another embodiment, the thickness of the bone plate amounts to 8-12% of the total width of the bone plate.
The main benefit among the advantages obtained via the invention lies in the fact that due to the device according to the invention, a great degree of flexibility is obtained during the process of adjustment of the bone fragments in relation to each other, particularly in the case of occlusion occurring during a maxillo-facial application. By means of the slide, placed onto the longitudinal bone plate and provided with a longitudinal hole extending cross-wise to the longitudinal axis of the plate, a limited 2-dimensional positioning in the x/y plane of the bone plate is rendered possible. The additional flexibility of the longitudinal bone plate in the z-direction, i.e. perpendicular to the x/y direction, (due to the longitudinal hole) renders possible fur
REFERENCES:
patent: 2406832 (1946-09-01), Hardinge
patent: 4696290 (1987-09-01), Steffee
patent: 5290288 (1994-03-01), Vignaud et al.
patent: 5344421 (1994-09-01), Crook
patent: 5352224 (1994-10-01), Westermann
patent: 5470333 (1995-11-01), Ray
Joos Ulrich
Talos Gilbert
Buiz Michael
Shai Daphna
Synthes (U. S. A)
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