JPH09108250A - Bone fixing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To naturally connect a plurality of pedicles to each other in a bone fixing device. SOLUTION: A block body 20 is formed from a deformable material matched to arrangement of a plurality of pedicles 11 and grooved parts 21 for simplifying the deformation are formed in the block body 20 so that the block body 20 is connected to an engagement element 10 by a ball joint 30.

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 enable the fixing means to be easily connected to an array of a plurality of pedicles fixed to a bone. is there.

[0004]

According to the present invention, there is provided a bone anchoring device comprising a plurality of pedicles.
1. The block 20 is formed of a material which can be deformed in accordance with the arrangement of the block 1, and a groove-shaped portion 21 for facilitating the deformation is formed in the block 20. A means of connecting by a joint 30 is taken.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A bone fixation device according to the present invention is a relatively elongated, directional device 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 vertebrae, but there are individual differences in the planting angle, and in order to completely absorb the variation, the block body 20 and the ball joint 30 are combined in the device according to the present invention. I did it.

The block body 20 for this purpose is basically formed in a block shape having a length covering a plurality of pedicles. However, in order to facilitate bending processing, that is, plastic deformation, a groove-shaped portion 21 is formed in the block body 20, the remaining portion is a maintenance portion 22 for maintaining strength, and one of the ball joints 30 is provided.

[0008] How to form the groove portion 21, 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 structures with the connectors 10 are formed in a block body 20 having a basic shape of a rectangular parallelepiped. The groove-shaped portion 22 is formed on any of the upper and lower or front and rear surfaces 20a, 20b, 20c, and 20d of the block body 20,
The ease of deformation is determined depending on the extent of formation.

The block 2 of the first embodiment shown in FIGS.
0 is a groove portion 2 provided so as to be cut down from the upper surface 20a.
2 (FIG. 4 (b)). Maintainer 2 between each groove 22
It goes without saying that the sample No. 1 retains the strength necessary for constructing the bone fixing device of the present invention. The groove portion 22 facilitates bending the block body 20 in the vertical direction.

As described above, each groove 22 is formed by the block 20
Is easily bent in the above-mentioned directions at the portion of the holding portion 21. In this case, it is better to bend in a direction in which the width of any of the groove portions 22 is narrowed (of course, not limited to the direction, any It can be bent in the direction.). In addition, the block body 20 is not limited to a rectangular parallelepiped shape, and may have an arbitrary shape such as a columnar shape in view of ease of manufacture and ease of forming the groove 22.

Further, a connector 10 for combining each pedal 11 and a block body 20 is used. The connector 10 has a means for adjusting the positional relationship between the pedicle 11 and the block body 20. The means for this is the ball joint 30. The ball joint 30 is a universal joint comprising a spherical ball part 31 and a socket part 32 for receiving the ball part. In the embodiment, the ball portion 31 is provided to protrude from the connector 10 and the socket portion 3
2 is formed inside the block body 20. Ball part 3
On both sides of the socket portion 32 sandwiching 1, an attachment port 34 for a tightener 33 for tightening the ball portion 31 is formed. Reference numeral 35 denotes a slot, which divides the socket part 32 into two parts up and down, and
Enables tightening by

Slots 13 and 14 are formed in the connector 10 so that the mounting position can be adjusted by shifting the pedicle 11 in the left-right or front-rear direction. As a result, the pedicle 11 and the ball portion 31 of the connector 10 can take a position orthogonal to each other and can rotate about three orthogonal axes.

The pedicle 11 is integrated with a screw means 16 formed on the top thereof by sandwiching the connector 10 between a screw shaft 17a and a screw ring 17b which can be screwed. The fasteners 33 are screwed into screw holes 34 formed in the block bodies 20 on both sides, and are integrated in an arbitrary direction.

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

Therefore, when the pedicle row is straight, it is not necessary to bend the block body 20, and even when the pedicle row is slightly curved, the ball joint 30 which is a means for adjusting the positional relationship between the connector 10 and the block body 20. Can be absorbed by. If it exceeds the range, the block body 20 is adapted to the pedicle row by freely plastically deforming.

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

[0018]

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 adjust the direction and the positional relationship of the connector 10 in accordance with the arrangement of the blocks 20 and to accurately adjust the shape of the block body 20. 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. 2; FIG. 3B is a sectional view taken along line BB of FIG. 2. (C) The CC sectional view taken on the line of FIG.

FIG. 5 is a perspective view showing a state of being attached to a spine.

Claims (3)

[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, the block body 20 is formed of a material that can be deformed in accordance with the arrangement, and a groove-shaped portion 21 for facilitating the deformation is formed in the block body 20, and the block body 20 and the engaging element 10 are connected to each other. A bone anchoring device connected by a ball joint 30. 2. The block body 20 has a rectangular parallelepiped shape, and has a configuration in which a cut-like groove-like portion 21 is formed on each of the upper, lower, front, and rear surfaces, and the remaining portion is a maintenance portion 22. 2. The bone anchoring device according to claim 1. 3. A socket portion 32 for fitting a ball portion 31 provided on a connector 10 is formed at a portion other than the groove portion 21 and the retaining portion 22 of the block body 20. Item 7. The bone fixation device according to Item 1.