KR20200121010A - Cervical fixation plate - Google Patents

Abstract

A cervical fixing plate of the present invention includes: a flat plate-type back plate; and a cage including a plurality of plate members having threads formed on one side thereof, and coupled to the back plate so that the plurality of plate members face each other at threads formed at one side. The present invention can be easily inserted into the spine to reduce the time required for spinal surgery.

Description

Cervical spine fixing plate {CERVICAL FIXATION PLATE}

The present invention relates to a cervical spine fixation plate, and more particularly, to a cervical spine fixation plate for supporting and fixing a spine from which a disk is removed during spinal surgery.

In general, spinal disorders such as structural degenerative deformity, congenital deformity, or traumatic deformity of the vertebrae such as spinal canal stenosis, which is caused by the contraction of the vertebral body, and the alignment between the vertebral body and the vertebral body are misaligned. , Various procedures are being performed for this.

These vertebrae are also referred to as the so-called waist, and are normally composed of 5 nodes, and adjacent spines are composed of 12 nodes, and disks exist between the vertebral bodies, which are spaces created by each vertebral body and the vertebral body normally.

However, the spine is congenital, degenerative, or other reasons such as accidents. Structural problems such as a problem in the stable arrangement or narrowing of the spacing between vertebral bodies occur, and if the symptoms intensify, surgical treatment is required.

At this time, one of the methods of spinal fixation is intervertebral cage insertion, and usually lay the patient on his stomach, incise the skin and muscles, expose the vertebrae, remove the intervertebral disc, which is the intervertebral structure, and remove the spinal cord. ) And the branch nerve (root) between the cage is inserted and the procedure is performed.

This cage is a device that removes the lesion intervertebral disc between the vertebral body and the vertebral body and is inserted instead of the original intervertebral disc.The cages used in the prior art have a constant height of the anterior and posterior sides of the cage, so there is a high risk of the cage being removed after the procedure. If the height of the spine is made high to correspond to the normal curvature of the spine, there is a problem that there is a high risk of damage to nearby nerves when the cage is inserted.

On the other hand, the cage that opens the front part after insertion has the same degree of opening up and down, and the opening angle is designed to be constant, so it does not properly respond to the spine of the human body where the degree of curvature is slightly different according to each vertebral body part. Since it occupies most of the internal space, there is a problem that the spinal fusion implant and the vertebral body are not well fused due to the small number of spinal fusion implants.

In addition, the conventional cage is not provided with a device for preventing the screw inserted into the vertebrae from being separated from the plate, there is a problem that the stability of the plate is reduced.

Korean Patent Registration No. 10-1297982

The technical problem of the present invention is conceived in this respect, and an object of the present invention is to provide a cervical vertebrae fixing plate capable of adjusting the spaced apart distance between cages.

In addition, an object of the present invention is to provide a cervical vertebrae fixing plate that prevents the flow of screws coupled to the spine to secure the connection of the plate.

The cervical spine fixing plate according to an embodiment of the present invention includes a flat plate-shaped back plate; And a cage that includes a plurality of plate members having threads formed on one side thereof, and is coupled to the back plate so that the plurality of plate members face each other with threads formed thereon.

In addition, the cervical vertebrae fixing plate according to an embodiment of the present invention may further include a cover disposed at a position opposite to the cage based on the back plate, and rotatable based on an axis coupled to the back plate.

In addition, the cage, a first cage disposed on the upper end; And a second cage disposed below the first cage.

In addition, the first cage includes a first barrier wall extended in the direction of the second cage, and a receiving groove for accommodating the second cage when the distance spaced between the first cage and the second cage is reduced, The second cage may include a second barrier wall extending in a direction of the first cage such that an outer surface contacts the inner surface of the first barrier wall.

In addition, the first cage and the second cage, the thread is formed so that the separation distance between the threads formed in the mutually abutting region as the distance from the back plate decreases, and according to the depth into which the screw is inserted, the first cage and The spaced apart distance of the second cage may be gradually expanded.

In addition, the back plate has a central screw hole for coupling the cage, and the central screw hole passes through the back plate in an elliptical shape, so that the screw fits the position where the cage moves along the long axis of the ellipse. Can be inserted.

In addition, the cover may include a first cover disposed on an upper end of the back plate; And a second cover disposed at the lower end of the back plate.

In addition, the central screw hole may have an upper side covered by the first cover and a lower side covered by the second cover.

In addition, in the central screw hole, when the cage is coupled by a screw in a central region of the central screw hole, the screw may be double covered by the first cover and the second cover.

In addition, the back plate is formed with a plurality of screw holes, and the cover is formed with protruding regions according to the number of the plurality of screw holes, so that each protruding region at an arbitrary angle simultaneously connects the plurality of screw holes. I can cover it.

In addition, the back plate has a fastening groove for inducing a sliding drive in a state in which the cage is coupled, the fastening groove is formed to be wider than the thickness of the cage, and the cage is connected to the back plate The position may be changed by sliding through the fastening groove.

In addition, the cage may be formed of polyether ether ketone (PEEK), and a space for storing synthetic aggregate may be formed therein.

In addition, the back plate may be formed of titanium, which is a biocompatible material.

The cervical spine fixing plate according to the present invention can be easily inserted into the spine because the position of the cage coupled to the back plate can be changed through the fastening groove formed in the back plate, thereby reducing the time required for spinal surgery.

In addition, the cervical spine fixing plate according to the present invention can expand the cage by inserting screws into the cage inserted between the vertebrae, and by filling the space formed during expansion with a synthetic aggregate, it is possible to obtain an elaborate picture after surgery.

In addition, the cervical spine fixing plate according to the present invention can improve the stability of the coupling between the back plate and the spine by preventing the screw inserted into the spine from being separated through the cover coupled to the rear of the back plate.

1 is a cervical vertebrae fixing plate according to an embodiment of the present invention.
2 shows a view in which a cover is added to the cervical spine fixing plate of FIG. 1.
3 shows a cervical vertebral fixing plate to which blocking walls are added to both sides of a cage according to another embodiment of the present invention.
4A and 4B show the process of inserting the cervical vertebrae fixing plate of FIG. 2 into the spine.
5 is a plan view of the cervical spine fixing plate of FIG. 2.
6A and 6B are diagrams for explaining a principle in which a cage is expanded among the cervical vertebrae fixing plates of FIG.
7A and 7B illustrate an example in which a cage having a changed thread shape is expanded.
8A and 8B illustrate another example in which a cage having a changed thread shape is expanded.
9A and 9B are views for explaining a driving principle of a cover among the cervical vertebrae fixing plates of FIG. 2.
10 shows an example of a back plate having a different shape of the central screw hole.

For a detailed description of the present invention to be described later, reference is made to the accompanying drawings, which illustrate specific embodiments in which the present invention may be practiced. These embodiments are described in detail sufficient to enable a person skilled in the art to practice the present invention. It should be understood that the various embodiments of the present invention are different from each other, but need not be mutually exclusive. For example, specific shapes, structures, and characteristics described herein may be implemented in other embodiments without departing from the spirit and scope of the present invention in relation to one embodiment. In addition, it is to be understood that the location or arrangement of individual components in each disclosed embodiment may be changed without departing from the spirit and scope of the present invention. Accordingly, the detailed description to be described below is not intended to be taken in a limiting sense, and the scope of the present invention, if properly described, is limited only by the appended claims, along with all scopes equivalent to those claimed by the claims. Like reference numerals in the drawings refer to the same or similar functions over several aspects.

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

The cervical spine fixing plate according to the present invention can be easily inserted into the spine because the position of the cage coupled to the back plate can be changed through the fastening groove formed in the back plate, thereby reducing the time required for spinal surgery.

1 is a cervical vertebrae fixing plate according to an embodiment of the present invention.

Referring to FIG. 1, a cervical vertebrae fixing plate 1 according to an embodiment of the present invention includes a cage 11 and a back plate 13.

The cage 11 may include a plurality of plates having threads formed on one side thereof. The cage 11 may be coupled to the back plate 13 so that a plurality of plates face one side on which threads are formed therebetween. In the cage 11, a plurality of plates may be combined in multiple stages. A plurality of plates constituting the cage 11 may have a thread formed in an area in contact with each other, and when a screw is inserted through the thread, a distance spaced between the plates may be extended. The cage 11 may be coupled in a form capable of sliding along the fastening groove by having one end fastened to the back plate 13.

On the other hand, the cage 11 may be inserted into a screw to prevent the flow of the cervical vertebrae fixing plate 1 is inserted into the spine, through which the position coupled to the back plate 13 can be fixed.

In addition, the cage 11 may be formed of polyether ether ketone (PEEK). Polyetheretherketone is a high-performance thermoplastic resin having various properties such as high strength, high rigidity, high temperature resistance, and chemical resistance, and is a biomaterial used in MRI and medical implants.

On the other hand, a plurality of plate-shaped materials constituting the cage 11 may be divided into a first cage and a second cage according to the arranged position or shape, and a related description will be described in detail with reference to FIGS. 5A and 5B below.

The back plate 13 may be provided in a flat plate shape. The back plate 13 may be provided in a form combined with the cage 11. For example, the back plate 13 may be disposed in a direction perpendicular to the cage 11. The back plate 13 may be connected to one end of the cage 11.

The back plate 13 may include a screw hole 131 penetrating the body. In detail, the back plate 13 may include a plurality of screw holes 131, and a screw 20 may be inserted through the screw hole 131.

The back plate 13 is connected to one end of the cage 11 on one side, and a fastening groove 133 for inducing sliding driving in a state in which the cage 11 is coupled may be formed. The back plate 13 may induce sliding driving of the cage 11 through the fastening groove 133. In addition, the back plate 13 may be formed with a central screw hole 130 into which screws inserted into the cage 11 are fastened.

On the other hand, the back plate 13 is formed of a biocompatible material to minimize rejection in the body. For example, the back plate 13 is formed of titanium to secure biocompatibility and high durability, but the material forming the back plate 13 is not limited thereto, and may be replaced with a material having high biocompatibility and high durability. I can.

2 shows a view in which a cover is added to the cervical spine fixing plate of FIG. 1.

Referring to FIG. 2, the cervical vertebrae fixing plate 1 according to another embodiment of the present invention may further include a cover 15.

The cover 15 may be disposed at a position opposite to the cage 11 with respect to the back plate 13. In detail, the cover 15 may be coupled to the cage 11 and different sides. The cover 15 may be arranged in a rotatable shape about an axis coupled to the back plate 13. The cover 15 may selectively cover the screw hole 131 according to the rotated angle.

That is, the cover 15 may be disposed to prevent separation of the screw 20 inserted into the spine through the back plate 13. The cover 15 is opened by inserting the screw 20 into the back plate 13 and fixing the cervical spine fixing plate 1 to the spine, and then rotating the cover 15 to cover the screw hole 131 It is possible to prevent the separation of the screw (20).

3 shows a cervical vertebral fixing plate to which blocking walls are added to both sides of a cage according to another embodiment of the present invention.

Referring to FIG. 3, the cage 11 may be provided in a form of shielding both sides. In detail, the cage 11 may have a side surface of the flat plate disposed at the top extending to the lower end to contact the side surface of the flat plate disposed at the bottom. Through this, the space inside the cage 11 and the space outside the cage 11 may be blocked. In addition, when a material such as synthetic aggregate is stored inside the cage 11, it can be prevented from leaking to the outside, and by preventing the inflow of bodily fluid from the patient's body to the inside of the cage 11, corrosion of the inserted screw Can be prevented.

4A and 4B show the process of inserting the cervical vertebrae fixing plate of FIG. 2 into the spine.

4A and 4B, the cage 11 may be inserted into a space spaced apart between the vertebrae 9. At this time, the cage 11 and the back plate 13 may be inserted into the spine 9 in a coupled state. In a state in which the cage 11 and the back plate 13 are coupled, the cervical spine fixing plate 1 inserted into the spine can move the back plate 13 or the cage 11 in the up/down direction. This movement may be guided by a coupling groove coupled between the cage 11 and the back plate 13, and after the positions of the cage 11 and the back plate 13 are determined, the screw 20 through the screw hole 131 ) Can be inserted and fixed to the spine 9.

When the cage 11 is inserted into the space spaced apart between the vertebrae 9 and the cervical spine fixing plate 1 is fixed, the screw 20 can be inserted through the back plate 13. At this time, as the screws 20 connecting the cage 11 and the back plate 13 are inserted, the plates constituting the cage 11 may be spaced apart from each other.

Meanwhile, a fastening groove 133 (FIG. 3) may be formed on a side surface connecting the cage 11 and the back plate 13. The fastening groove may be formed to be wider than the thickness of the cage 11 so that the coupling between the back plate 13 and the cage 11 is maintained even in the extended state of the cage 11. In addition, the cage 11 connected to the back plate 13 through the fastening groove may slide upward or downward to change its position. Through this, it is possible to easily insert the cervical spine fixing plate 1 into the spine by changing the position of the cage 11 without moving the back plate 13 during surgery.

5 is a plan view of the cervical spine fixing plate of FIG. 2.

Referring to Figure 5, the cage 11 may store the synthetic aggregate inside. To this end, the cage 11 may have a space for storing synthetic aggregates therein. In detail, when the synthetic aggregate 115 is stored inside the cage 11, a high quality image can be obtained when photographing the cervical vertebrae fixing plate 1 fixed to the spine, and an accurate location can be determined based on this. have.

The synthetic aggregate 115 stored inside the cage 11 may be stored in an expanded space by inserting a screw 20 extending the cage 11 after the cervical vertebrae fixing plate 1 is fixed to the spine. In detail, the screw 20 connecting the cage 11 and the back plate 13 is inserted into the cage 11, so that the multi-stage structure of the cage 11 can be expanded. Thereafter, the synthetic aggregate may be injected through the head of the screw 20 and discharged into the cage 11.

In order to store the synthetic aggregate 115 in several areas as shown in FIG. 5, in the process of inserting the screw 20, the synthetic aggregate 115 is primarily injected into the area adjacent to the back plate 13, and then the screw ( By further inserting 20), the synthetic aggregate 115 may be secondarily injected into the area away from the back plate 13.

In addition, a hole for discharging the synthetic aggregate 115 may be formed in the center of the screw other than the tip of the screw 20, and in this case, a plurality of the synthetic aggregate 115 is injected after inserting the screw 20 as much as possible. Synthetic aggregate can be stored in the area of.

As shown in FIG. 5, the fastening groove 133 may be in the form of a groove recessed into the back plate 13 to prevent separation of the cage 11. In particular, even if the cage 11 is coupled to the back plate 13 and flows forward or backward, the separation of the cage 11 may be prevented by the jaws formed in the fastening groove 133. In addition, the fastening groove 133 and the cage 11 are formed with a predetermined distance, so that the central screw between the cage 11 and the back plate 13 can be easily slid upward or downward. have.

On the other hand, the cage 11 may include a structure for preventing the outflow of the injected synthetic aggregate 115, which will be described in detail through FIGS. 6A and 6B below.

6A and 6B are diagrams for explaining a principle in which a cage is expanded among the cervical vertebrae fixing plates of FIG. 1.

The cage 11 may be composed of a first cage 111 disposed at the top and a second cage 113 disposed at the bottom. A thread 110 is formed inside the first cage 111 and the second cage 113 in contact with each other. The first cage 111 and the second cage 113 are formed with interlocking barrier walls to prevent the outflow of the synthetic aggregate stored therein.

The first cage 111 may have a screw thread 110 formed on a lower surface of the first cage 111 in contact with the second cage 113. The first cage 111 may include a first blocking wall 1111 extending in the direction of the second cage 113. The first cage 111 may have a receiving groove 1113 accommodating the second blocking wall 1131 formed in the second cage 113. In detail, the receiving groove 1113 may accommodate the second barrier wall 1131 formed in the second cage 113 when the distance separated between the first cage 111 and the second cage 113 is reduced. . In addition, the receiving groove 1113 is a composite that is injected through the central screw 20 ′ when the central screw 20 ′ is inserted between the first cage 111 and the second cage 113 to extend the distance apart. Aggregate can be stored.

The second cage 113 may include a second blocking wall 1131 extending in the direction of the first cage 111 so that the outer surface contacts the inner surface of the first blocking wall 1111. The second blocking wall 1131 may contact the first blocking wall 1111 to separate the space inside the cage 11 from the outside.

As such, the first cage 111 and the second cage 113 are each formed with a blocking wall extending in a contact direction along the outer circumferential surface, so that when the screw 20 is inserted and the spaced distance is extended, the inside of the cage 11 It is possible to prevent the synthetic aggregate stored in the cage (11) from being exposed to the outside.

Meanwhile, when the cage 11 is inserted into the spine, the first cage 111 and the second cage 113 are connected to the back plate 13 in a state of contact with each other as shown in FIG. 6A, and formed in a spaced apart from each other. The central screw 20 ′ is inserted through the screw thread 110 so that the spaced apart space may be expanded as shown in FIG. 5B.

In detail, when the tip of the central screw 20 ′ is inserted along the thread 110, the space spaced between the first cage 111 and the second cage 113 may be slightly expanded, and the central screw 20 ′ When a body having a pitch formed in) is inserted, a space spaced apart between the first cage 111 and the second cage 113 may be maximized. The central screw (20 ′) inserted between the first cage 111 and the second cage 113 has the same length as the length of the thread 110 formed inside the cage 11 or is less than the length of the thread 110 It can have a short length.

When a central screw equal to the length of the screw thread 110 is inserted, the synthetic aggregate 115 discharged through the screw may be stored in the receiving groove 1113. On the other hand, when a screw having a length shorter than the length of the screw thread 110 is inserted, the synthetic aggregate is filled from the tip of the screw to the inner wall of the cage 11 to improve the sharpness of the photographed picture.

7A and 7B show examples of a cage in which the shape of a thread is changed.

7A and 7B, the first cage 111 and the second cage 113 may have threads formed so that the distance between the threads formed in the contacting region decreases as the distance from the back plate 13 increases. . Through this, the spaced distance between the first cage 111 and the second cage 113 may be gradually expanded according to the depth into which the screw is inserted.

In detail, the standard of the screw inside the cage 11 is changed so that the cage 11 and the back plate 13 can be coupled. In this embodiment, screws having different lengths may be inserted to control the extent to which the cage 11 is extended.

As shown in FIG. 7A, when a screw corresponding to the length of two of the six threads formed at the bottom of the first cage 111 is inserted, the first cage 111 and the second cage 113 are at the diameter of the screw. It can be spaced apart by subtracting the depth of the second thread.

As shown in FIG. 7B, when a screw corresponding to the length to the screw thread formed at the farthest position from the back plate 13 among the six threads formed at the lower end of the first cage 111 is inserted, the first cage 111 and The second cage 113 may be spaced apart by subtracting the depth of the thread from the diameter of the screw.

That is, a spaced apart space may be formed between the inserted central screw 20` and the threads formed in the first and second cages 111, 113, and using this, depending on the degree of insertion of the central screw 20` The separation distance between the first cage 111 and the second cage 113 may be gradually expanded.

As described above, when the depth of the thread decreases as the distance from the back plate 13 decreases, the distance between the first cage 111 and the second cage 113 may be adjusted according to the depth into which the screw is inserted. As such, through the feature that the separation distance between each cage can be adjusted, it can be applied to various patients with different separation distances between the spines.

8A and 8B illustrate another example in which a cage having a changed thread shape is expanded.

In order to couple the cage according to the embodiment of the present invention to the back plate, a tapered central screw 30 ′ may be inserted. In this case, a cage having a screw thread corresponding to the inclined surface of the tapered central screw 30 ′ may be provided.

In this case, as the central screw 30 ′ is inserted to the beginning of the cage as shown in FIG. 8A, the distance between the first cage 111 and the second cage 113 may be partially expanded. Thereafter, when the central screw 30 ′ is completely inserted as shown in FIG. 8B, the outer peripheral surface of the central screw 30 ′ and the inner surface of the threads of the first cage 111 and the second cage 113 may contact each other. That is, even in the process of inserting the central screw 30 ′ from the state of Fig. 8a to the state of Fig. 8b, the separation distance between the first cage 111 and the second cage 113 is not further extended, and the first central screw ( 30`) can be maintained in the inserted state. In this way, when a screw thread corresponding to the shape of the central screw (30 ′) is formed on one side of the cage, unlike the examples shown in FIGS. 7A and 7B, the distance between the cages is minimized, so that the minimum separation distance between the spines is required. It can be used in a position to be

9A and 9B are views for explaining a driving principle of a cover among the cervical vertebrae fixing plates of FIG. 2.

Referring to FIG. 9A, the cover 15 includes a first cover 15a disposed at an upper end with respect to the center of the back plate 13 and a second cover disposed at the lower end with respect to the center of the back plate 13 ( 15b) may be included.

The first cover 15a may partially cover the screw hole 131 disposed at the upper end of the plurality of screw holes 131. The first cover 15a may cover the upper side of the central screw hole 130. The first cover 15a may be pin-coupled with the back plate 13. The first cover 15a may rotate clockwise or counterclockwise. The first cover 15a may have a plurality of protrusions formed to cover the screw hole 131 and the central screw hole 130 formed on the top of the back plate 13. The number of protrusions may correspond to the number of screw holes 131 formed on the top of the back plate 13 including the central screw hole 130.

The second cover 15b may partially cover the screw hole 131 disposed at the lower end of the plurality of screw holes 131. The first cover 15a may cover the lower side of the central screw hole 130. The second cover 15b may be pin-coupled with the back plate 13. The second cover 15b may rotate clockwise or counterclockwise. The second cover 15b may have a plurality of protrusions formed to cover the screw hole 131 and the central screw hole 130 formed at the bottom of the back plate 13. The number of protrusions may correspond to the number of screw holes 131 formed at the bottom of the back plate 13 including the central screw hole 130.

In a state in which the screw hole 131 is not covered by each cover of the screw as shown in FIG. 9A, the screw may be inserted to fix the cervical vertebral fixing plate 1 to the spine. After the screw is inserted into each screw hole 131, each screw hole 131 can be covered by rotating the first cover 15a and the second cover 15b, through which the screw hole 131 is inserted. It can prevent the leakage of screws.

As shown in FIG. 9B, the first cover 15a and the second cover 15b may respectively cover the screw holes 131 formed at the top or bottom of the back plate 13. In addition, the first cover (15a) and the second cover (15b) double cover the central screw hole 130 from the upper and lower sides, thereby preventing the leakage of the screws connecting the cage 11 and the back plate 13. I can.

10 shows an example of a back plate having a different shape of the central screw hole.

Referring to FIG. 10, the central screw hole 130 formed in the back plate 13 may be formed in an elliptical shape to correspond to the flow range of the cage 11 slidingly driven through the fastening groove 133.

In detail, as the cage 11 is inserted into the spine, the height to which the cage 11 is connected may be changed by sliding and driving along the back plate 13. In this case, since the central screw hole 130 is formed to have the same size as the diameter of the screw, it may not be easy to insert into the cage 11. In contrast, the central screw hole 130 may be expanded along the height direction of the back plate 13. Even in a state where the position of the cage 11 is changed through the oval central screw hole, the position of the cage 11 can be fixed by inserting a screw into the cage 11. Meanwhile, the extent to which the central screw hole 130 is expanded may be changed by a fastening groove formed in the back plate 13.

On the other hand, although not shown, when the screw is inserted into the upper portion of the expanded central screw hole 130, the area covering the head of the screw is expanded by the first cover 15a, and the lower portion of the central screw hole 130 When the screw is inserted, the area covering the head of the screw is expanded by the second cover 15b to prevent the screw inserted into the central screw hole 130 from being separated.

As such, the cervical vertebrae fixing plate according to the present invention can expand the cage by inserting screws into the cage inserted between the vertebrae, and by filling the space formed during expansion with a synthetic aggregate, it is possible to obtain an elaborate picture after surgery.

In addition, the cervical spine fixing plate according to the present invention can improve the stability of the coupling between the back plate and the spine by preventing the screw inserted into the spine from being separated through the cover coupled to the rear of the back plate.

Although the present invention has been described in detail through exemplary embodiments above, those of ordinary skill in the art to which the present invention pertains will understand that various modifications can be made to the above-described embodiments without departing from the scope of the present invention. will be. Therefore, the scope of the present invention is limited to the described embodiments and should not be determined, and should be determined by all changes or modifications derived from the claims and the concept of equality as well as the claims to be described later.

1: cervical spine fixing plate
11: cage
110: thread
111: first cage
1111: first barrier wall
1113: receiving groove
113: second cage
1131: second barrier wall
115: synthetic aggregate
13: Backplate
130: central screw hole
131: screw hole
133: fastening groove
15: cover
15a: first cover
15b: second cover
20: screw
20`, 30`: center screw
9: spine

Claims (13)

Flat plate backplate; And
Containing, cervical spine fixing plate comprising a plurality of plate members having threads formed on one side thereof, and a cage coupled to the back plate so that the plurality of plate members face one side surface having threads formed therebetween.
The method of claim 1,
A cover disposed at a position opposite to the cage based on the back plate and rotatable based on an axis coupled with the back plate; further comprising, a cervical vertebrae fixing plate.
The method of claim 1,
The cage,
A first cage disposed at the top; And
Containing, cervical vertebrae fixing plate; a second cage disposed at the bottom of the first cage.
The method of claim 3,
The first cage,
A first barrier wall extending in the direction of the second cage, and a receiving groove for accommodating the second cage when the distance spaced between the first cage and the second cage is reduced,
The second cage,
The cervical vertebrae fixing plate including a second barrier wall extending in the direction of the first cage so that the outer surface contacts the inner surface of the first barrier wall.
The method of claim 3,
The first cage and the second cage,
The thread is formed so that the distance between the threads formed in the area in contact with each other decreases as the distance from the back plate increases, so that the distance between the first cage and the second cage is gradually expanded according to the depth into which the screw is inserted. , Cervical fixed plate.
The method of claim 2,
The back plate,
A central screw hole for coupling the cage is formed,
The central screw hole,
Passing through the back plate in an oval shape, the screw is inserted in accordance with the position where the cage is moved along the long axis of the oval, cervical vertebrae fixing plate.
The method of claim 6,
The cover,
A first cover disposed on an upper end of the back plate; And
Containing, cervical vertebrae fixing plate; a second cover disposed at the lower end with respect to the center of the back plate.
The method of claim 7,
The central screw hole,
The upper side is covered by the first cover, the lower side is covered by the second cover, cervical vertebrae fixing plate.
The method of claim 7,
The central screw hole,
When the cage is coupled by screws in the central region of the central screw hole, the screw is double covered by the first cover and the second cover, cervical vertebrae fixing plate.
The method of claim 2,
The cover,
The plurality of screw holes are formed with protruding regions according to the number, so that each protruding region at an arbitrary angle covers the plurality of screw holes simultaneously.
The method of claim 1,
The back plate,
In a state in which the cage is coupled, a fastening groove for inducing a sliding drive is formed,
The fastening groove,
It is formed wider than the thickness of the cage,
The cage,
In a state connected to the back plate, the position is changed by sliding along the fastening groove.
The method of claim 1,
The cage,
Polyether ether ketone (PEEK, Polyether Ether Ketone), formed inside a space for storing synthetic aggregates, cervical spine fixation plate.
The method of claim 1,
The back plate,
A cervical vertebral fixation plate formed of titanium, a biocompatible material.

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