Surgery – Instruments – Orthopedic instrumentation
Patent
1998-03-05
1999-10-12
Buiz, Michael
Surgery
Instruments
Orthopedic instrumentation
606 61, A61B 1756, A61B 1758, A61F 230
Patent
active
059647620
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a bone plate comprising an intermediate portion with first and second ends, having at least a hole at each end for receiving an anchoring screw.
Bone plates are employed in particular in surgery of the vertebral column. To this purpose, different lengths of the bone plates are needed with different distances of the corresponding bone screws. The surgeon has a supply of a set of different sizes of such plates for this purpose. Already this store-keeping is disadvantageous. Furthermore, often the operation requires an adjustment of the parts to be connected with each other so that during an operation successively plates of different lengths have to be applied.
It is the object of the invention to provide a bone plate which removes the disadvantages described above.
According to the invention, a bone plate is provided, comprising an elongated intermediate portion with first and second ends, having at least a hole at each end for receiving an anchoring screw, said intermediate portion comprising a first portion having an elongated hole extending in the longitudinal direction of said intermediate portion, a second portion connectable with said first portion and having a bore, a screw connecting said two portions and being guided through said elongated hole, a surface portion comprising a structured surface at said second portion of said intermediate portion and a recess for registering with said structured surface in said first portion, and a fixing element for engaging with said surface portion for the purpose of locking the relative position of said first and second portions with respect to each other.
Preferably, the recess is formed as a threaded bore for receiving said fixing element.
Preferably, the fixing element has a longitudinal direction and comprises an element resiliently biased in the longitudinal direction against a rod for biasing the rod towards the structured surface on the first portion.
Preferably, the structured surface comprises a screw-shaped waviness.
Preferably, the rod biased to the structured surface comprises an annular projection for engagement with the structured surface.
In the inventive bone plate, the disadvantageous store-keeping is not only eliminated but it is also possible, by varying the relative position of the two portions with each other, to carry out a distraction or contraction, respectively, of the portions to be connected and to carry out a preliminary locking without loosening the anchoring screws nor without replacing the bone plates.
Further features and advantages will be apparent from the description of an embodiment with reference to the figures.
The figures show:
FIG. 1 a plan view of the detached two portions of the bone plate;
FIG. 2 the bone plate adjusted to the minimal length;
FIG. 3 the same bone plate adjusted to the maximum length;
FIG. 4 a side view of an anchoring screw;
FIG. 5 a side view of a locking screw;
FIG. 6 a sectional view through a fixing element;
FIG. 7 a side view of the bone plate with inserted anchoring screws and fixing element on an enlarged scale;
FIG. 8 a detailed illustration of FIG. 7 in a further enlarged scale;
FIG. 9 a section through the bone plate; and
FIG. 10 a section through a securing element.
The bone plate is described referring to FIG. 1 to 3 initially.
The bone plate comprises a first portion 1 and a second portion 2. The first portion 1 has the shape of an elongated rectangular plate with a first elongated hole 3 extending in parallel to the longitudinal axis and offset from the center to a side edge. Further, a corresponding second elongated hole 4 is provided extending in parallel to the first elongated hole 3 and offset from the center to the opposite side edge of the plate. A threaded bore 5 is provided between the two elongated holes 3, 4. As can be seen in FIG. 9, the two edges 6, 7 are formed on the lower surface of the plate extending downwards such that the second portion 2 is guided between the lower surface of the plate and the side edges 6, 7 in the manner of a rail. At one end,
REFERENCES:
patent: 3604414 (1971-09-01), Borges et al.
patent: 3659595 (1972-05-01), Haboush
Biedermann Lutz
Harms Jurgen
Bui Vy Q.
Buiz Michael
Neuner George W.
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