JP2741584B2 - Bone fixation device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention includes a pedicle having a directional block arranged along an array of a plurality of pedicles fixed to a bone in order to maintain a bone such as a spine in a predetermined positional relationship. The present invention relates to a bone anchoring device in which a body and a block body are integrated by a connector.

[0002]

2. Description of the Related Art For example, in order to hold a spine in a desired shape, a technique for fixing a positional relationship between vertebrae is known. For example, FIG. 3 of JP-A-5-2691431 and FIG.
The invention of No. 6237 is also disclosed. However, they have a problem in that the implant implanted in the spine is connected to a rod-shaped or plate-shaped member, so that the rod-shaped or plate-shaped member must be bent during the operation.

[0003]

SUMMARY OF THE INVENTION The present invention has been made in view of the above point, and an object of the present invention is to make it possible to accurately adjust the shape of a fixing means to an arrangement of a plurality of pedicles fixed to a bone. Is to do so.

[0004]

According to the present invention, there is provided a bone anchoring device comprising a plurality of pedicles.
1 and a groove for facilitating the deformation, while forming the block body 20 with a material deformable according to the arrangement of the pedicles 11 and leaving a retaining portion 21 for arranging each pedicle 11 at a predetermined position. The means for forming the shape part 22 in the block body 20 is adopted.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A bone fixation device according to the present invention is a relatively elongated, directional arrangement arranged along an array of a plurality of pedicles 11 fixed to a plurality of bones, such as the vertebrae of the spine or cervical spine. This is a device that includes a block body 20 having a property, and connects and integrates each pedicle 11 with the block body 20 by a connector 10.

The pedicle 11 is a so-called foot-like base member having a bolt-type fixing means called an implant or a screw, which is screwed into a bone by a screw. For example, one pedicle 11 is screwed into the vertebra, but there is an individual difference in the implantation angle, and in order to completely absorb the variation, the block body 20 is combined with the device according to the present invention.

The block 20 is basically a block having a length covering a plurality of pedicles 11. However, in order to facilitate bending, that is, plastic deformation, a groove-shaped portion 22 for facilitating the deformation is left in a block body, except for a retaining portion 21 for keeping each pedicle 11 at a predetermined position. 20.

[0008] How to form the groove-shaped portion 22, which is a means for facilitating deformation, can basically be freely determined. For example, the groove-shaped portion 22 can be set in either a direction perpendicular to the longitudinal direction of the elongated block body 20 or a direction parallel thereto.

In the case of the embodiment, a required number of connection ports 23 for connecting the coupling shafts 12 of the connectors 10 are formed in the block body 20 having a rectangular parallelepiped basic shape. A plurality of groove-shaped portions 22 in a direction perpendicular to the direction are formed. The ease of deformation is determined by the extent of the groove-shaped portion 22 formed on the upper and lower surfaces or the front and rear surfaces 20a, 20b, 20c, and 20d of the block body 20 and in what extent.

The block 2 of the first embodiment shown in FIGS.
0 (the same thing is indicated by A in FIG. 1).
0a, a groove 22-1 (FIG. 4)
(A)) and an L-shaped groove 22-2 (FIG. 4 (b)) extending from the rear surface 20d to the lower surface 20b. Since the sizes of the groove portions 22-1 and 22-2 are different, the sizes of the holding portions 21-1 and 22-2 therebetween are also different, but the smaller holding portion 21-1 also uses the pedicle 11. Needless to say, the strength necessary for integrating the bone anchoring device of the present invention remains. The groove portion 22-1 facilitates bending the block body 20 in the vertical direction, and the groove portion 22-2
Makes it easy to bend the block body in the up-down direction and the front-back direction.

The block 2 of the embodiment 2 shown in FIGS.
0 (the same is indicated by A 'in FIG. 1)
L-shaped groove portion 22-3 extending from 0d to the lower surface 20b
(FIG. 7 (b)) and the inverted L-shaped groove portions 22-4 (FIG. 7 (a)) extending from the upper surface 20a to the front surface 20c are alternately and symmetrically arranged. This groove portion 22-3,
The size of 22-4 is the same, and therefore, the maintenance portion 21-3,
The size of 21-4 is also the same. Grooves 22-3, 22
-4 facilitates bending the block body 20 in the up-down direction and the front-back direction.

A block body 20 according to a third embodiment shown in FIGS. 8 to 10 (the same one is indicated by A "in FIG. 1) has an inverted L-shaped groove portion 22 extending from the upper surface 20a to the front surface 20c.
-5 (FIG. 10 (a)) is arranged with the holding portion 21-5 interposed therebetween. The groove portion 22-5 is also a block body 20.
In the vertical direction and the front-back direction.

As described above, each of the groove portions 22 (22-1 to 22-2)
-5) connects the block body 20 to the maintenance unit 21 (21-1 to 21-2).
The portion 1-5) can be easily bent in each of the above-mentioned directions. In this case, it is better to bend in a direction in which the width of one of the groove portions 22 is narrowed (of course, it is not limited to that direction, but is arbitrary). It can be bent in the direction.). Further, the block body 20 is not limited to a rectangular parallelepiped shape, and may have an arbitrary shape, such as a columnar shape, for ease of manufacture and ease of forming the groove 22.

The connector 10 is used to combine each pedicle 11 and the block body 20. This connector 1
0 has a means for adjusting the positional relationship between the pedicle 11 and the block body 20. Therefore, pedicle 1
Elongated holes 13 and 14 are formed in the connector 10 so that the connector 1 can be displaced in the left-right direction or the front-rear direction. .

As a result, the pedicle 11, the coupling shaft 12 and the orthogonal shaft 15 can take an orthogonal position to each other, and can rotate around each axis. The pedicle 11 has a screw shaft 17a and a screw ring 17b which can be screwed with a screw means 16 formed on the top.
The connector 10 is sandwiched between it and integrated with it,
The coupling 10 and the coupling shaft 12 are integrated by a clamp 18 that clamps the orthogonal shaft 15, and the coupling shaft 12 is coupled to a connection port 23 by a clamp 19 that is screwed into a screw hole formed in the block body 20. Integrate. Reference numerals 24 and 25 indicate screw holes.

In order to use the device according to the present invention thus constructed, for example, a required number of pedicles 11 are implanted into a vertebra V of a spine in a conventional manner, and some of the pedicles 11 ( In the illustrated example, all the pedicles are three, but there may be two or four or more pedicles).

Therefore, if the pedicle row is straight, there is no need to bend it. It is not necessary to process the block body 20 even when the pedicle row is within a range that can be absorbed by the positional relationship adjusting means provided in the connector 10. Is exceeded, the block body 20 is freely plastically deformed to conform to the pedicle row.

The device according to the present invention is used by being implanted in a living body, and is removed when it becomes unnecessary. Therefore, due to its properties, it is manufactured using a material such as a metal or a synthetic resin having a good affinity for a living body.

[0019]

Since the present invention is constructed and operates as described above, a plurality of pedicles 11 fixed to a bone are provided.
It is very easy to exactly match the shape of the block body 20 to the arrangement of the blocks. Therefore, there is a feature that the labor required for processing the block body 20 during the treatment is reduced, and no unreasonable force is applied to the joint between the pedicle 11 and the block body 20.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing an embodiment of a bone fixing device according to the present invention.

FIG. 2 is a plan view of a block body according to the first embodiment.

FIG. 3 is a front view of the same.

FIG. 4A is a sectional view taken along line AA of FIG. 3; FIG. 3B is a sectional view taken along line BB of FIG. (C) CC sectional view taken on the line of FIG.

FIG. 5 is a plan view of a block body according to a second embodiment.

FIG. 6 is a front view of the same.

FIG. 7A is a sectional view taken along line AA of FIG. 6; FIG. 7B is a sectional view taken along line BB of FIG. 6. (C) A sectional view taken along line CC of FIG.

FIG. 8 is a plan view of a block body according to a third embodiment.

FIG. 9 is a front view of the same.

10A is a sectional view taken along line AA of FIG. (B) A sectional view taken along line BB of FIG.

FIG. 11 is a perspective view showing a state of being attached to a spine.

Claims (3)

(57) [Claims] 1. A directional block which is arranged along an array of a plurality of pedicles fixed to a bone,
In a bone fixing device in which a pedicle and a block body are integrated by a connector, a plurality of pedicles 1
1 and a groove for facilitating the deformation, while forming the block body 20 with a material deformable according to the arrangement of the pedicles 11 and leaving a retaining portion 21 for arranging each pedicle 11 at a predetermined position. A bone fixing device, wherein the shape portion 22 is formed on the block body 20. 2. The block body 20 has a rectangular parallelepiped shape, and has a configuration in which cut-shaped groove-shaped portions 22 are formed on upper, lower, front, and rear surfaces, and a remaining portion is a maintenance portion 21. 2. The bone anchoring device according to claim 1. 3. A slot 1 for adjusting the positional relationship between the pedicle 11 and the block body 20 so that the pedicle 11 can be attached to the pedicle 11 while being shifted in the left-right or front-rear direction.
3, 14 are formed on the connector 10, and
2. The bone fixation device according to claim 1, wherein the connection shaft 12 is rotatably attached to the connector 10 about the orthogonal shaft 15.