KR100985059B1 - Apparatus for spinal fixation - Google Patents

Abstract

The present invention is a spinal fixing device for supporting the spine in combination with the rod, The rod is mounted, the through hole is formed in the lower surface, the head portion is formed in the receiving hole; A screw formed at an upper end of a joint part accommodated in the accommodation hole; And a fixing member coupled to the head to fix the rod, wherein the screw in the head coupled to the rod is movable along the shape of the through hole.

As described above, the present invention has an effect of imparting motility to the screw even after the screw is fastened to the rod, and the motility may be limited to allow movement only in a specific direction by the operator according to the patient. It can promote and reduce the side effects of existing spinal fixation.

Joint part, receiving hole, rod, screw

Description

Spinal Fixation {Apparatus for spinal fixation}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spinal fixation device, and more particularly, in a device (pedicle screw), which is spaced apart by a predetermined distance between adjacent vertebrae, a predetermined clearance between the head and the screw. The present invention relates to a spinal fixation device that can more efficiently distribute the load generated in a fixed spine.

The spine protects the delicate spinal cord and nerve roots, supports the body and cushions external shocks. The vertebra is a structure in which a plurality of vertebrae are stacked, and there is an intervertebral disc (disc) between the vertebrae to distribute the load and impact evenly throughout the vertebrae.

However, spinal diseases continue to increase due to lack of exercise and incorrect posture. In the treatment of diseases related to the spine, an indirect treatment method through physical therapy and a direct treatment method for correcting and fixing the spine are performed by attaching a separate fixing device to the damaged vertebrae.

There are many factors that damage the spine, but the main cause is known to be the biomechanical factor. Therefore, spinal fixation devices such as pedicle screws are generally performed for physical correction of a damaged spine.

As a direct treatment as described above, a general spinal fixation procedure using a pedicle screw includes a spine rod and a head part which are combined with the head part and then inserted into the spine and disposed approximately parallel to the longitudinal direction of the spine. It is a fixed coupling method.

However, as described above, the conventional pedicle screw loses its mobility when it is applied to the spine.

In other words, the screw is coupled to the head portion according to the size of the through-hole, but the screw is inserted into the vertebra, when the head portion is coupled to the rod, the rod presses the joint of the screw so that the screw is completely fixed do.

Therefore, after the screw is engaged with the rod through the head portion, the vertebrae in which the screw is inserted cannot move. Therefore, there may be a problem that the load is concentrated in the vertebrae in which the screw is not inserted.

In addition, depending on the patient's condition, the vertebrae may be in a specific direction rather than being completely fixed.

In some cases, it is more desirable to allow the movement to be performed.

The present invention has been made to solve the above problems, the present invention is a spinal fixing device for supporting the spine in combination with the rod, the rod is mounted, a through-hole is formed in the lower surface, the receiving hole inside A head portion formed; A screw formed at an upper end of a joint part accommodated in the accommodation hole; And a fixing member coupled to the head to fix the rod, wherein the screw is movable along the shape of the through hole in the head coupled to the rod.

In addition, a locking plate of a predetermined shape is installed inside the accommodating hole above the joint portion. The through hole is preferably a circular or elliptical shape having an inner diameter such that the joint portion does not deviate.

Preferably, the joint portion is spherical in shape, and the locking plate is preferably configured such that an inner surface thereof is formed according to the shape of the joint portion to allow the joint portion to slide on the locking plate. The wear preventing member may be attached to the upper surface of the accommodating hole and the through hole as needed, and the material of the wear preventing member is a single polymer or a composite of these materials having a biocompatibility.

In addition, the material of the synthetic polymer compound is preferably any one of polyethylene (PE), polyurethane (PU), ultra high molecular weight polyethylene (UHMWPE) or acetal resin or a composite of these materials.

The head portion is provided with a mounting portion for accommodating the rod upwards, and a screw thread is formed on the inner circumferential surface or the outer circumferential surface of the head portion near the mounting portion.

The fixing member is formed on the inner circumferential surface or outer circumferential surface of the screw thread engaged with the upper thread of the head portion and is coupled to the head portion to fix the rod.

On the other hand, the head portion may be configured in the shape as shown in Figure 9 so as to fasten the rod spaced laterally by a predetermined position in the center or the receiving hole.

On the other hand, it is preferable that the locking step is formed in the receiving hole, the locking plate is fitted in the head portion. In addition, the head may be configured to be separated into an upper head portion in which the rod is mounted and a lower head portion in which the screw is fastened.

In addition, a female thread is formed on an inner circumferential surface of the through hole and a male thread is formed on an outer circumferential surface of the joint part, and the joint may be configured to be accessible from the through hole.

The present invention as described above has the effect of imparting the mobility to the screw even after the screw is fastened to the rod.

In addition, the mobility can be adjusted to allow a greater movement in a specific direction by the operator according to the patient, it is possible to further enhance the treatment effect, it can reduce the side effects that occur in the existing spinal fixation device.

According to the present invention, the rod and the screw are completely separated from each other, and thus, the rod and the screw are completely separated from each other, and the effect of preventing the detachment of the screw is provided.

In addition, the wear hole is installed or attached to the wear preventing member has an effect of preventing the wear of the inner peripheral surface and the joint portion of the receiving hole due to sliding.

In addition, the locking jaw is formed on the upper end of the receiving hole has the effect of preventing the separation of the locking jaw.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is an exploded perspective view of the spinal fixation device according to a preferred embodiment of the present invention. Referring to the drawings, the screw 20 of the present invention is composed of a screw portion 22 is formed on the outer circumferential surface to be inserted into the vertebra and the joint portion 21 formed on the upper end of the screw portion 22. The head portion 10 has a mounting portion 13 is formed so that the rod 200 can be mounted, the female thread 14 is formed on the upper inner peripheral surface. Referring to FIG. 2, the head portion 10 is opened upward and downward, and the lower portion of the head portion 10 prevents detachment of the joint portion 21 of the screw 20 and moves the screw portion 22 only in a predetermined direction. The through hole 11 having a predetermined size and shape is formed. An accommodating hole 12 in which the joint part 21 is accommodated is formed between the mounting part 13 and the through hole 11 inside the head part 10. The shape of the accommodating hole 12 is preferably formed so that the joint portion 21 can slide in the accommodating hole 12 to rotate, and the wear preventing member 40 is disposed at the end and the lower end of the accommodating hole 12. ) Is preferably inserted or applied. The wear preventing member 40 is to prevent abrasion by minimizing frictional force with the head portion 10 during the movement of the joint portion 21 and the screw portion 22 to use a synthetic polymer compound or ceramic having biocompatibility as a single each. Alternatively, these materials may be combined and cured to fit the shape of the receiving hole 12 and the through hole 11, or may be applied by applying in a liquid state. And, the material of the synthetic polymer compound is preferably any one of polyethylene (PE), polyurethane (PU), ultra high molecular weight polyethylene (UHMWPE) or acetal resin or a composite of these materials.

Referring to FIG. 3, in the state where the screw 20 is inserted into the head portion 10, the locking plate 30 having an inner surface formed thereon is fitted into the upper portion of the joint portion 21 so as to be in contact with the outer circumferential surface of the joint portion 21. do. The locking plate 30 of the present invention is fitted downward from the upper side of the head portion 10. As indicated by the dotted line in FIG. 3, the locking plate 30 is physically pressed in the state in which the outer diameter is contracted and inserted into the head portion 10, and is inserted into the receiving hole 12 and in the receiving hole 12. Extends to its original diameter. 2 and 3, the locking jaw 15 is formed at the upper end of the accommodation hole 12 to prevent the locking plate 30 from being separated. As shown in FIG. 3, the locking jaw 15 is preferably concave inwardly to allow easy sliding of the joint 21.

On the other hand, after the locking plate 30 is inserted into the receiving hole 12 of the head portion 10, the rod 200 is placed on the mounting portion 13, the fixing member 50 is formed with a male thread on the outer peripheral surface The rod 200 is fixed by screwing to the female thread 14 of the head 10.

On the other hand, as shown in Figure 12, in the fastening method of the head portion and the fixing member, a male thread is formed on the outer peripheral surface of one side of the head portion 10f as a modified embodiment, the male screw on the inner peripheral surface of the fixing member 50 A female screw thread engaged with the acid may be formed and fastened.

As shown in FIG. 4, the screw 20 is not pressurized even in a state in which the rod 200 is coupled to the head portion 10, so that the screw 20 may move. 5 and 6 show the direction in which the threaded portion 22 can move according to the shape of the through hole 11. The upper figure is sectional drawing A-A of FIG. 4, and the lower figure has shown the range which the threaded part 22 can move. The through hole 11 shown in FIG. 5 is circular and has an inner diameter larger than the outer diameter of the threaded portion 22 adjacent to the through hole 11. Therefore, the joint portion 21 rotates in the receiving hole 12 and the screw portion 22 is capable of circular motion as shown in FIG. Of course, the diameter of the circle through which the screw 20 moves depends on the diameter of the through hole 11.

The through hole 11 shown in FIG. 6 is a circle extending or extending to one side, and the threaded portion 22 of the screw 20 may provide a larger range of motion in a specific direction as shown below. That is, when the upper and lower movement range is M1 and the left and right movement range is M2, M1 can be made larger than M2 as shown in the figure. Of course, since the through hole 11 may be manufactured in various shapes such as an ellipse or a polygon, the operator may determine the movement direction of the screw 20 by selecting the head part 10.

Hereinafter, other embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Referring to FIG. 7, the head parts 10a and 10b according to another exemplary embodiment of the present invention may include an upper head part 10a and a lower head part 10b so as to be detachable. This configuration can be coupled to the receiving hole 12 more easily without the need to physically press the locking plate 30. In addition, the operator can more easily determine the direction in which the screw 20 can be moved by replacing only the lower head portion 10b in which the through hole 11 is formed without having to replace the entire head portion.

At this time, the method of fastening the upper head portion 10a and the lower head portion 10b so as to be detachable from each other is not only a screw coupling using a female screw and a male screw but also a separate buckle or coupling screw as shown in FIGS. 7 and 8. It may be carried out using known techniques such as.

On the other hand, the spinal fixing device of the present invention that can move the screw 20 even if the rod 20 is fastened to the head portion, as shown in Figure 9, the rod 200 is the head portion in order to lower the height of the head portion as possible It is also applicable to the spinal fixation device of the type which is spaced apart in the lateral direction by a predetermined position at the center of the receiving portion 12 or the receiving hole 12.

In addition, the present invention further provides a spinal fixation device configured to allow the joint portion 21 of the screw 20 to enter and exit the through hole 11e as shown in FIG. 10 as another embodiment. Referring to FIG. 10, even when the rod 200 is fastened to the head portion 10e, the female joint portion 21 of the screw is provided with a female thread on the inner circumferential surface of the through hole 11e of the head portion 10e so that entry and exit of the accommodation hole is free. (14) is formed, and the male thread 23 which engages with the female thread 14 formed in the through hole 11e is formed on the outer circumferential surface 23 of the screw joint portion 21. In this case, the male screw thread 23 is preferably formed at a predetermined length in the center of the joint part 21 to prevent deviation from the entire joint part 21, and as shown in FIG. 11, the joint part 21. It is preferable that the screw is a round screw so as to minimize the wear of the male thread 23 by the rotation of. Therefore, unlike the existing spinal fixation device, there is an effect that can be inserted into the vertebrae without the screw inserted into the head.

Embodiments of the present invention disclosed in the specification and drawings are only presented as specific examples for clarity and are not intended to limit the scope of the invention.

In addition to the embodiments disclosed herein, it is apparent to those skilled in the art that other modifications based on the technical idea of the present invention may be implemented.

1 is an exploded perspective view of a spinal fixation apparatus according to a preferred embodiment of the present invention,

2 is a cross-sectional view of a head portion according to a preferred embodiment of the present invention;

3 is a cross-sectional view showing a state in which the spinal fixation device is coupled according to a preferred embodiment of the present invention;

4 is a cross-sectional view showing a state in which the spinal fixation device is coupled according to a preferred embodiment of the present invention;

5 is a cross-sectional view taken along the line A-A, and the through hole is circular, and the lower view is a perspective view showing the movement of the screw according to the shape of the through hole;

6 is a cross-sectional view of A-A showing a through hole extending to one side, the lower view is a perspective view showing the movement of the screw according to the shape of the through hole,

7 is a cross-sectional view showing an exploded view of the spinal fixation device according to another embodiment of the present invention;

8 is a cross-sectional view showing a state in which the spinal fixation device is coupled according to another embodiment of the present invention;

9 is a cross-sectional view showing a state in which the present invention is applied to the head portion that the rod is fastened spaced laterally by a predetermined position from the center of the head portion,

10 is a cross-sectional view showing a state in which the head and the screw fastened to the rod in the spinal fixation device according to another embodiment of the present invention;

11 is a cross-sectional view showing a state in which a screw coupled to the head and the rod fastened in the spinal fixation device according to another embodiment of the present invention,

12 is a cross-sectional view showing a state in which the head and the fixing member is fastened according to a modified embodiment of the present invention.

** Description of the symbols for the main parts of the drawings **

10: head 20: screw

30: stopping plate 40: wear protection member

50: fixing member

Claims (13)

delete In the spinal fixation device for supporting the spine in combination with a rod, A head portion on which the rod is mounted, a through hole is formed at a lower surface thereof, and a receiving hole is formed at an inner side thereof; A screw formed at an upper end of a joint part accommodated in the accommodation hole; And a fixing member coupled to the head to fix the rod. The screw in the head portion coupled with the rod can move along the shape of the through hole, And a locking plate installed inside the receiving hole, wherein a locking jaw is formed in the receiving hole so that the locking plate is fitted inside the head portion. The spinal fixation device according to claim 2, wherein the through hole is circular. 3. The device of claim 2, wherein the through hole is elliptical. The spinal fixing device according to claim 2, wherein an inner surface of the locking plate is formed to be slidable on an outer circumferential surface of the head portion. The spinal fixing device according to claim 2, wherein the wear preventing member is provided on the upper surface of the accommodation hole and the through hole. 7. The device of claim 6, wherein the wear preventing member is made of any one of a synthetic polymer compound and a ceramic. 8. The spinal fixation device according to claim 7, wherein the synthetic polymer compound comprises any one of polyethylene (PE), polyurethane (PU), ultra high molecular weight polyethylene (UHMWPE), or acetal resin. The spinal fixation apparatus according to claim 2, wherein the head portion is shaped to engage the rod in the lateral direction of the receiving hole. delete In the spinal fixation device for supporting the spine in combination with a rod, A head portion on which the rod is mounted, a through hole is formed at a lower surface thereof, and a receiving hole is formed at an inner side thereof; A screw formed at an upper end of a joint part accommodated in the accommodation hole; And a fixing member coupled to the head to fix the rod. The screw in the head portion coupled with the rod can move along the shape of the through hole, The head unit is a spinal fixing device, characterized in that removable by the upper head portion and the lower head portion to which the screw is fastened. In the spinal fixation device for supporting the spine in combination with a rod, A head portion on which the rod is mounted, a through hole is formed at a lower surface thereof, and a receiving hole is formed at an inner side thereof; A screw formed at an upper end of a joint part accommodated in the accommodation hole; And a fixing member coupled to the head to fix the rod. The screw in the head portion coupled with the rod can move along the shape of the through hole, A female thread is formed on an inner circumferential surface of the through hole, and a male thread is formed on an outer circumferential surface of the joint part, and the joint is accessible from the through hole. The spinal fixing device according to claim 2, wherein a male screw thread is formed on the upper outer peripheral surface of the head portion, and a female screw thread is formed on the inner peripheral surface of the fixing member (50).

Images