Surgery – Instruments – Orthopedic instrumentation
Patent
1996-11-26
1998-01-20
Jackson, Gary
Surgery
Instruments
Orthopedic instrumentation
606 73, A61B 1780
Patent
active
057096864
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The invention concerns a bone plate for stabilizing and/or compressing a bone.
BACKGROUND OF THE INVENTION
A bone plate is known from French patent document 742,618 wherein circular boreholes in the plate slant relative to a normal to the plate and are fitted with inside threads. These boreholes accept bone screws fitted with a second threaded portion which is widened compared to the conventional threaded screw shank segment and corresponding to the inside thread of the plate boreholes. Because of the slant of the plate boreholes, the bone screws also can be anchored at a slant, determined by said boreholes, into the bone.
The known bone plate incurs the drawback that the slant of the bone screws cannot be selected at will but instead is predetermined by the slant of the boreholes and their inside thread.
SUMMARY OF THE INVENTION
The object of the invention is palliation and to create a bone plate of which the boreholes are designed selectively to make possible two different kinds of screw anchorings. In the first application, a bone screw with a spherical head may be screwed into an elongated slot of the plate within a wide and selectable range at an angle to the plate normal into the bone. By tilting the countersink of the plate boreholes, furthermore a compressive effect is made possible.
In the second application a bone screw with a head thread and in the form of a bracing screw can be vertically and rigidly screwed into the plate at the partial inside thread of the elongated slot.
The invention achieves its object by a bone including an elongated plate defining a longitudinal axis along its length. The bone plate has an upper surface and a lower surface for application to a bone. A plurality of elongated holes are arranged along the length of the plate for receiving bone screws. At least one of the elongated holes has a first diameter D.sub.L, which is measured along the length of the hole. A second diameter D.sub.Q is measured across the width of the hole. Advantageously, D.sub.L is greater than D.sub.Q and at least one of the elongated holes includes a partial threaded portion arranged in the area of diameter D.sub.Q. The threaded portion is configured for seating a bone screw which has a threaded head.
Essentially, the advantages offered by the invention are that the bone plate of this invention are ubiquitously applicable in the most diverse cases such as fixation, compression, and employment as fixateur interne (internal affixer) in the sense of a bracing screw, but especially in the maxillofacial field requiring three-dimensional matching.
The invention offers also the following advantages conventional diameter, and
BRIEF DESCRIPTION OF THE DRAWINGS
The invention and further embodiments of this invention are elucidated below in relation to partly diagrammatic drawings of an illustrative embodiment wherein.
FIG. 1 is a partial perspective of a bone plate of the invention,
FIG. 2 is a partial top view of the bone plate of the invention, FIG. 3 is a partial longitudinal section of the bone plate along line III--III of FIG. 2,
FIG. 4 is a cross-section orthogonal to the bone-plate longitudinal direction along line IV--IV of FIG. 2,
FIG. 5 is a partial longitudinal section of a bone plate of the invention with a double-threaded bone screw which is screwed-in perpendicularly,
FIG. 6 is a partial longitudinal section of a bone plate of the invention with a bone screw passing through the plate perpendicularly or at a slant, said bone screw comprising a spherical head and serving as a non-compressive affixation screw,
FIG. 7 is a cross-section perpendicular to the longitudinal section of FIG. 6 and located in the hole area of the bone plate, and
FIG. 8 is a partial longitudinal section of a bone plate of the invention through which passes a perpendicular bone screw with a spherical head and serving as a compressive affixation screw.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
The bone plate shown in FIG. 1 comprises several holes 2 to receive diverse types of bone screw
REFERENCES:
patent: 4493317 (1985-01-01), Klaue
patent: 5002544 (1991-03-01), Klaue et al.
patent: 5041113 (1991-08-01), Biedermann et al.
patent: 5085660 (1992-02-01), Lin
Schmoker Roland
Talos Gilbert
Jackson Gary
Reip David O.
Synthes (U.S.A.)
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