Bone plate

Details Bone plate Bone plate

1998-02-27

2001-03-27

Willse, David H. (Department: 3738)

Surgery

Instruments

Orthopedic instrumentation

C606S075000, C606S076000, C606S070000

Reexamination Certificate

active

06206881

ABSTRACT:

FIELD OF THE INVENTION
The invention concerns a bone plate for internal stabilization of a fractured bone.
BACKGROUND
A bone plate of this general type is known from the European patent document A 0,530,585. The permanent affixation of bone plates with conical plate holes using bones screws with structured conical heads depends on the achievable geometric, i.e. positive locking between the screw heads and the plate holes, and such locking is most problematic when dealing with small sizes,
SUMMARY OF THE INVENTION
An object of the invention is to provide a bone plate of the above species ensuring optimal geometric locking using the bone screws used in affixing such bone plates.
The system according to the present invention comprises a bone plate with a plurality of conical plate holes tapering toward a bone contact surface and at least two bone screws for anchoring the bone plate to a bone. The screws have a conical head with a textured or structured lateral outside surface having a hardness which is greater than that of the portion of the bone plate proximal to the plate holes. Preferably, the hardness of the lateral outside surface is 230 to 450 HV and the hardness of the bone plate is 100 to 220 HV. The heads of the bone screws and the plate holes can both be fitted with threads. The threads can be mutually matching threads or the thread on the heads of the bone screws can comprise one or more turns relative to the thread of the plate holes.
In one embodiment, the structured lateral outside surface comprises a structure, preferably circumferential ribs, running transversely to the longitudinal axis of the bone screw. Preferably, the bone plate is made of a plastic and the screws are made of metal or ceramics. The plastic used for the bone plate can be reinforced with metal fibers, plastic fibers, or carbon fibers.
The advantages offered by the invention substantially are that, due to the design of the invention of the structured surfaces of the screw heads serving to affix the bone plate, excellent geometric locking with this plate is achieved.
The invention and further embodiments of this invention are elucidated below in relation to partly schematic representations of several illustrative embodiments, wherein:


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