WO2021029721A1

WO2021029721A1 - Vertebral cage

Info

Publication number: WO2021029721A1
Application number: PCT/KR2020/010821
Authority: WO
Inventors: 김경학; 이길삼
Original assignee: 주식회사 엔닥
Priority date: 2019-08-14
Filing date: 2020-08-14
Publication date: 2021-02-18
Also published as: KR102106023B1

Abstract

The present invention relates to a vertebral cage comprising: a body which is inserted between a vertebra and a neighboring vertebra, and is provided with a space part in which bone powder may be filled; a blade which is rotatably provided on an inner side surface of the body; and a locking means which fixes the blade, rotated or not rotated on the body, to the inner side surface of the body, wherein the locking means comprises fixing protrusions and groove parts which are respectively provided on the respective surfaces facing each other of the body and the blade, and are coupled to each other.

Description

Spine cage

The present invention relates to a cage that is inserted into a space between vertebrae to prevent a subsidence phenomenon and to unite a vertebrae adjacent to a vertebrae, and in detail, a blade for fixing between upper and lower vertebrae. It relates to a cage for a spine configured to precisely rotate between vertebral bodies and to keep the rotated state firmly.

In general, a disk existing between a vertebral bone and a bone functions as a joint and plays a very important role in minimizing the impact applied to the spine as the position and shape of the nucleus contained in the disk changes according to the movement of the spine.

Most of the nucleus is made up of water (water), and as you age, the amount of water gradually decreases, and the disk loses its buffering function.

As a result, when excessive pressure is applied to the fibers, back pain occurs, and when further proceeding, the fibers are severely stretched or ruptured, pressing the nerve roots located at the back, causing pain in the pelvis and legs.

After that, various side effects such as spinal deformity occur as the spacing of the spine gradually narrows or the spine bones settle down.

As a method of treating diseases accompanying the disc, there is a method of removing the damaged intervertebral disc and then replacing the space between two adjacent vertebrae with a prosthetic material, a so-called cage. That is, the prosthetic material restores spinal function by restoring the original distance between two adjacent vertebral bodies, which is the original height of the intervertebral disc.

That is, the vertebral cage can be said to be a structure for supplying bones for fusion between the two vertebral bones while maintaining the height between the two vertebral bones in the lower and upper vertebrae in place after removing the damaged disk.

Conventional vertebral cages include a body inserted into a space between a vertebrae adjacent to a vertebrae while providing a space for filling a bone-generating material (bone meal), and a vertebrae positioned at the top in a state provided in the body. It may be configured to include a large; blades that are inserted into the upper surface of the vertebrae positioned at the bottom and the lower to maintain the gap between the upper and lower vertebral bodies.

However, the conventional cage for spine has a problem in that the blades flow on the body due to the force transmitted to the spine when the patient moves, and thus cannot perform its function. That is, the blades inserted into the upper and lower surfaces of the vertebrae are separated from the vertebrae by the movement of the vertebrae, and thus the gap between the vertebral bodies cannot be maintained.

In order to solve the above problems, a method of fixing the blade to the body has been proposed. However, this method has the advantage of reducing the flow of the blade by increasing the coupling force between the blade and the body, but due to the increase in the overall size of the body, the incision area is also increased, slowing the recovery of the patient and leaving a scar. have.

Therefore, recently, a method of providing a blade rotatably on a body has been used.

In other words, when inserting the body into the intervertebral body, the blade is not exposed on the body, so that the overall size of the body is not increased, and after the body is inserted between the vertebral bodies, the blade is rotated on the body to fix the upper and lower vertebrae. A structured cage is being used.

However, such a conventional spine cage has a problem in that the configuration required to rotate the blade on the body is complicated, and a separate fixing means for fixing the rotated blade on the body is further required.

In addition, since the above conventional cage for spine allows the procedure of rotating the blade on the body and the procedure of attaching a separate fixing means on the body to fix the rotated blade, in the end, the operation time There is a problem that increases and makes the surgical process difficult.

And, since the fixing means has a structure that can be used only by a separately designed surgical tool, in the end, there is a disadvantage in that a cost for manufacturing a separate surgical tool is incurred, which increases the surgical cost and thus increases the cost burden of the patient. .

Accordingly, the present applicant has developed the present invention in order to solve the above problems, and as a related prior art document, there is a "cage having a blade for intervertebral fixation" of Korean Patent No. 10-1388078.

An object of the present invention is to solve the above problems, and to provide a cage for a spine configured to easily rotate a blade on a body inserted between a vertebral body by a simple operation of a practitioner and to firmly maintain the rotated blade. There is this.

In addition, the present invention, the structural process of rotating the blade on the body and the structural process of fixing the blade in the rotated state are simultaneously performed to shorten the operation time and, in addition, to increase the bonding force between the body and the blade The purpose is to provide a cage.

The present invention is inserted between the vertebrae and the adjacent vertebrae, the body provided with a space portion that can be filled with bone meal; A blade rotatably provided on the inner side of the body; And a locking means for fixing the blade rotated or non-rotated on the body on the inner surface of the body, wherein the locking means is a fixing protrusion provided on a surface facing each other and coupled with the body and the blade And it may include a groove.

In addition, the groove portion, when the blade has a horizontal position not exposed to the outside on the space portion of the body, the horizontal state maintenance groove coupled to the fixing protrusion; A vertical state maintenance groove that is coupled to the fixing protrusion when the blade is exposed to the outside on the space portion of the body and has a vertical position; And a guide groove that connects the horizontal state maintenance groove and the vertical state maintenance groove to each other, and contacts the fixing protrusion while the blade is rotated.

In addition, at a point where the vertical state maintenance groove and the guide groove are connected to each other, a release preventing jaw is provided to prevent the fixing protrusion inserted into the vertical state maintenance groove from being separated, and the horizontal state maintenance groove and the guide groove At the points connected to each other, a round surface may be provided to assist the separation of the fixing protrusion inserted into the horizontal state maintaining groove.

In addition, the guide groove may have a shape inclined upward from a direction in which the horizontal state maintaining groove is formed to a direction in which the vertical state maintaining groove is formed.

In addition, it may further include; a rotating means for rotating the blade and an elastic means provided between the blades for intimate contact with the inner surface of the blade.

In addition, the rotation means, an outer bush inserted into a fastening hole formed in the body; An inner bush rotatably inserted into the outer bush and coupled to the blade; And a space portion provided between the inner bush and the outer bush to accommodate the elastic means.

In addition, the elastic means may include any one of a coil spring, a washer spring, and a cylindrical elastic body having an elastic restoring force.

In addition, the present invention is inserted between the vertebrae and the adjacent vertebrae, the body provided with a space portion that can be filled with bone meal; A blade rotatably provided on the inner side of the body; And a locking means for fixing the rotating or non-rotated blade on the body on the inner surface of the body, wherein the locking means includes a rotation shaft provided in the blade and rotatably inserted into a fastening hole formed in the body. Rotation can be restricted.

In addition, the locking means, when the blade is erected in a vertical direction on the body, the rotation shaft and the portion of the body in which the fastening hole is formed are formed in cooperation with each other pin groove; And a fixing pin inserted into the pin groove to limit the rotation of the rotation shaft.

In addition, the locking means may be threaded portions respectively formed on an outer peripheral surface of the rotation shaft and an inner peripheral surface of the body that partitions the fastening hole.

The cage for the spine according to the present invention includes a locking means for maintaining the blade rotated on the body in a state firmly coupled to the inner surface of the body so as to penetrate the upper/lower vertebrae, so that the rotation or flow of the blade by external force is It is prevented so that the spacing of the upper and lower vertebrae can be kept constant, and, in addition, interference between the nervous tissue passing through the spine and other tissues can be reduced.

In addition, in the cage for spine according to the present invention, since the process of rotating the blade and the process of firmly attaching the rotated blade to the body can be performed in the rotational motion of the operator, it provides convenience of surgery to increase the success rate of surgery, Accordingly, the physical burden on the patient can be reduced.

In addition, since the cage for spine according to the present invention has an elastic means for maintaining the blade in close contact with the inner surface of the body, it is possible to firmly maintain the posture of the non-rotated or rotated blade on the body, and in addition, the body It is also possible to prevent the blade from being separated and lost.

1 is a perspective view as viewed from the front of a cage for a spine according to an embodiment of the present invention.

Figure 2 is a perspective view as viewed from the rear of the cage for the spine according to an embodiment of the present invention.

Figure 3 is a cross-sectional view of a cage for the spine according to an embodiment of the present invention.

Figure 4 is an exploded perspective view of the cage for the spine according to an embodiment of the present invention.

Figure 5 is an exploded perspective view for showing the configuration of the engaging projection of the locking means according to an embodiment of the present invention.

Figure 6 is a perspective view showing a state in which the blade of the cage for spine is rotated 90 degrees according to an embodiment of the present invention.

Figure 7 is a cross-sectional view for showing the configuration of the groove of the locking means according to an embodiment of the present invention.

8 is a plan view showing the configuration of a locking means according to another embodiment of the present invention.

Figure 9 is a front view for showing the configuration of a locking means according to another embodiment of the present invention.

Advantages and features of the present invention, and a method of achieving them will become apparent with reference to the embodiments described below in detail together with the accompanying drawings.

However, the present invention is not limited to the embodiments disclosed below, but will be implemented in a variety of different forms, only these embodiments make the disclosure of the present invention complete, and common knowledge in the technical field to which the present invention pertains. It is provided to completely inform the scope of the invention to those who have, and the invention is only defined by the scope of the claims.

Hereinafter, a cage for a spine according to an embodiment of the present invention will be described in detail with reference to FIGS. 1 to 7. In describing the present invention, detailed descriptions of related known functions or configurations are omitted so as not to obscure the subject matter of the invention.

1 is a perspective view of a spine cage according to an embodiment of the present invention viewed from the front, FIG. 2 is a perspective view of a spinal cage according to an embodiment of the present invention viewed from the rear, and FIG. 3 is an embodiment of the present invention A cross-sectional view of a cage for a spine according to an example, FIG. 4 is an exploded perspective view of a cage for a spine according to an embodiment of the present invention, and FIG. 5 is a diagram showing a configuration of a coupling protrusion of a locking means according to an embodiment of the present invention 6 is a perspective view showing a state in which the blade of the cage for spine is rotated by 90 degrees according to an embodiment of the present invention, and FIG. 7 shows the configuration of a groove of a locking means according to an embodiment of the present invention. Fig. 8 is a plan view showing the configuration of a locking means according to another embodiment of the present invention, and Fig. 9 is a front view showing the configuration of a locking means according to another embodiment of the present invention.

As shown in FIGS. 1 to 7, the cage 100 for a spine according to an embodiment of the present invention is inserted between a vertebrae and an adjacent vertebrae, and a body provided with a space in which bone meal can be filled ( 110) and a blade 120 rotatably provided on the inner surface of the body 110; And a locking means 200 for fixing the blade 120 rotated or non-rotated on the body 110 on the inner surface of the body 110.

First, the body 110 may have a trapezoidal shape as a whole when viewed on a plane, and a space portion in which bone meal can be filled is provided at the center thereof.

The body 110 may be made of a metal alloy that is harmless to the human body, and may be made of a plastic material such as fiber-reinforced plastic, polyetheretherketone (PEEK), or a polymer.

Further, a plurality of protrusions may be provided on the upper and lower surfaces of the body 110 to prevent the body 110 from flowing between the vertebral bodies.

The blade 120 may be rotatably provided on the inner surface of the body 110 as described above in a state accommodated in the space portion of the body 110.

The blade 120 may be disposed in a horizontal posture that is not exposed in the space portion of the body 110 as shown in FIG. 1 before the body 110 is inserted into the body.

On the contrary, after the body 110 is inserted between the vertebral bodies, as shown in FIG. 6, the body 110 may be rotated on the inner surface of the body 110 by a rotating means 300 to be described later and disposed in a vertical position. Then, the longitudinal ends are respectively exposed to the upper and lower portions on the space portion of the body 110, and the exposed portions of the blade 120 can be respectively inserted into the lower surface of the upper vertebrae and the upper surface of the lower vertebrae. .

The locking means 200 serves to maintain a state in which the blade 120 disposed in a horizontal or vertical position in the space portion of the body 110 is firmly coupled to the inner surface of the body 110, In particular, it serves to maintain the rotation angle of the blade 120, which is disposed in a vertical position and has its longitudinal ends inserted into the upper and lower vertebral bodies, respectively.

This, the locking means 200, as shown in Figures 4 and 5, the fixing protrusion 210 provided on the inner surface of the body 110; And a groove 220 into which the fixing protrusion 210 is inserted and provided on one surface of the blade 120 facing the inner surface of the body 110.

The fixing protrusions 210, as shown in FIG. 4, are shown in the drawings as being provided in pairs at intervals on the inner side of the body 110 in one embodiment of the present invention. It is provided to protrude toward one side of the blade 120 on the inner side of the body 110 while having a shape.

The groove portion 220, as shown in Figures 5 and 7, when the blade 120 has a horizontal posture that is not exposed to the outside on the space portion of the body 110, the fixing protrusion 210 A horizontal state maintenance groove 221 coupled with the; A vertical state maintenance groove 222 coupled with the fixing protrusion 210 when the blade 120 is exposed to the outside on the space portion of the body 110 and has a vertical posture; And a guide groove 223 that connects the horizontal state maintenance groove 221 and the vertical state maintenance groove 222 to each other and contacts the fixing protrusion 210 while the blade 120 is rotated. can do.

When the blade 120 is disposed parallel to the inner surface of the body 110 so that both ends of the blade 120 are not exposed to the outside on the space portion of the body 110, the fixing protrusion 210 ) Is inserted into the groove. That is, when the fixing protrusion 210 is inserted into the horizontal state maintaining groove 221, as shown in FIG. 1, the blade 120 may maintain a horizontal state parallel to the inner surface of the body 110.

The horizontal state maintenance groove 221 may have an engraved hemispherical shape that can be combined with the fixing protrusion 210.

The vertical state maintenance groove 222 is disposed so that the blade 120 crosses the inner surface of the body 110 so that both ends thereof in the longitudinal direction are exposed to the outside on the space portion of the body 110, and the fixing protrusion 210 It can be called a groove into which is inserted. That is, when the fixing protrusion 210 is inserted into the vertical state maintaining groove 222, as shown in FIG. 6, the blade 120 may be disposed in a vertical state crossing the inner surface of the body 110.

Such, the vertical state maintaining groove 222 may also have an engraved hemispherical shape that can be combined with the fixing protrusion 210.

The guide groove 223, when the blade 120 disposed in a horizontal state is rotated by a rotating means 300 (see FIGS. 3 and 4) to be described later and disposed in a vertical state, the horizontal state maintenance groove 221 The fixing protrusion 210 inserted into the groove serves as a guide so that it can be easily inserted into the vertical state maintenance groove 222.

The guide groove 223 may have an arc shape connecting the horizontal state maintenance groove 221 and the vertical state maintenance groove 222 to each other while being disposed along a part of the circumferential direction with respect to the rotation center of the blade 120. have.

On the other hand, as shown in FIG. 7, the fixing protrusion inserted into the vertical state maintaining groove 222 is prevented from being separated at a point where the vertical state maintaining groove 222 and the guide groove 223 are connected to each other. A departure prevention jaw 224 may be provided.

The separation prevention jaw 224 serves to further maintain the rotation angle of the blade 120 by preventing the blade 120 disposed in the vertical direction from flowing even when receiving an external force. That is, it serves to prevent the fixing protrusion 210 inserted into the vertical state maintaining groove 220 from being separated from the vertical state maintaining groove 222 by an external force.

On the other hand, at a point at which the horizontal state maintaining groove 221 and the guide groove 223 are connected to each other, a round surface 225 that helps the separation of the fixing protrusion 210 inserted into the horizontal state maintaining groove 221 ) Can be provided.

Round surface 225, when the blade 120 disposed in the horizontal direction is rotated by the rotating means 300 to be described later, the fixing protrusion 210 inserted into the horizontal state maintenance groove 221 is maintained in a horizontal state It serves to be easily separated from the groove 221.

Rotation of the blade 120 by the rotation means 300 can be made easily by the departure prevention jaw 224 and the round surface 225 as described above, and in addition, the posture of the blade 120 disposed in the vertical direction is firmly Can be maintained.

In addition, the guide groove 223 is provided to have a shape inclined upward from the direction in which the horizontal state maintaining groove 221 is formed to the direction in which the vertical state maintaining groove 222 is formed. It is also possible to further prevent the inserted fixing protrusion 210 from being separated from the vertical state maintaining groove 222.

For reference, in an embodiment of the present invention, the fixing protrusion 210 is provided on the inner surface of the body 110, and the groove 220 is provided on one surface of the blade 120. It is shown in, but is not limited thereto. That is, the fixing protrusion 210 may be provided on one surface of the blade 120 and the groove part 220 may be provided on the inner surface of the body 110 to face it.

On the other hand, the locking means 200 further includes an elastic means 400 provided between the rotating means 300 and the blade 120 to make the blade 120 in close contact with the inner surface of the body 110 can do.

The elastic means 400 is such that one surface of the blade 120 facing the inner surface of the body 110 is in close contact with the inner surface, thereby increasing the coupling force between the body 110 and the blade 120, and It is rotated by 90 degrees so that the blade 120 disposed in a vertical state can continuously maintain its rotation angle.

The elastic means 400 may be implemented as a metallic elastic body such as a coil spring or a washer spring, but is not limited thereto, and may be implemented as a cylindrical elastic body made of a flexible material having an elastic restoring force. For reference, in an embodiment of the present invention, the coil spring is shown on the drawing as being interposed between the rotating means 300 and the blade 120.

In addition, the cage 100 for spine according to an embodiment of the present invention may include a rotating means 300 for rotating the blade 120.

The rotation means 300, as shown in Figures 3 and 4, the outer bush 310 inserted into the fastening hole 111 formed in the body 110; An inner bush (320) rotatably inserted into the outer bush (310) and coupled to the blade (120); And a receiving space 330 provided between the inner bush 320 and the outer bush 310 to accommodate the elastic means 400.

The outer bush 310 may be inserted into the fastening hole 111 formed in the body 110 in a force-fitting manner, and one end portion thereof in the longitudinal direction may be partially exposed to the outside of the body 110.

The inner bush 320 is a component that is directly connected to the blade 120, and the other end thereof in the longitudinal direction may be coupled with a fastening hole formed in the central portion of the blade 120.

In addition, a flange 321 in contact with one end in the longitudinal direction of the elastic means 400 accommodated in the space portion 330 is provided on an outer peripheral surface of one end in the longitudinal direction of the inner bush 320, and an inner bush ( A tool insertion groove 322 into which the tip of the surgical tool for rotating 320 is inserted is provided.

The receiving space 330 is formed between one end in the longitudinal direction of the inner bush 320 and the other end in the longitudinal direction of the outer bush 310, and may accommodate the elastic means 400 as described above.

One end in the longitudinal direction of the elastic means 400 accommodated in the receiving space 330 may be in contact with the flange 321 of the inner bush 320 and the other end in the longitudinal direction may be in contact with one end in the longitudinal direction of the outer bush 310. With this configuration, one surface of the blade 120 may be in close contact with the inner surface of the body 110. And, when the operator rotates the inner bush 320 while inserting the surgical tool into the tool insertion groove 322 formed in the inner bush 320 in order to rotate the blade 120, the elastic means 400 is the receiving space 330 ) Can be momentarily compressed and then tensioned to its original state.

Although the specific embodiments according to the present invention have been described so far, various modifications are possible without departing from the scope of the present invention.

For example, as shown in FIG. 8, a rotation shaft 121 integrally connected with the blade 120 may be used as a means for rotating the blade 120. And, the outer peripheral surface of the rotary shaft 121 and the inner peripheral surface of the body 110 that divides the fastening hole 111 can be screwed to each other by forming a threaded portion, such a configuration is locking according to another embodiment of the present invention It can be said to be a means.

The operator may rotate the rotation shaft 121 and the blade 120 by inserting a surgical tool into the tool insertion groove 121a provided at the tip of the rotation shaft 121. In addition, while the rotation shaft 121 and the fastening hole 111 are screwed so as to have sufficient binding force, the rotation shaft 121 may be further rotated at a predetermined angle to position the blade 120 in a vertical state. Here, the vertical state may be referred to as a state in which the longitudinal end of the blade 120 is exposed to the upper and lower portions of the space portion of the body 110 and inserted into the upper and lower vertebrae.

On the other hand, the space portion formed in the body 110 to be filled with bone meal has a size and shape such that the blade 120 and the rotating shaft 121 can be easily inserted into the fastening hole 111 from the inside of the body 110. Can have.

That is, as shown in FIG. 8, the space portion is a pair of vertical walls disposed to face each other with a gap longer than the length of the blade 120 when viewed from a plane, and a slope connected to the upper end of the vertical wall. It may be formed by a horizontal wall connecting the upper ends of the wall and the inclined wall to each other. At this time, the pair of vertical walls of the blade 120 rotated in connection with the rotation shaft 121 formed on the blade 120 is rotated and inserted into the fastening hole 111 from the inside of the body 110. It is preferably arranged at intervals so as not to interfere with the longitudinal ends.

In addition, a pin groove 510 and a fixing pin 520 may be further used as locking means for fixing the blade 120 and the rotation shaft 121 configured as above on the body 110.

That is, as shown in Fig. 9, when the blade 120 is vertically erected on the body 110, the rotation shaft 121 and the portion of the body 111 in which the fastening hole 111 is formed are Pin groove 510 formed in cooperation; And a fixing pin 520 inserted into the pin groove 510 to limit rotation of the rotation shaft.

In order to form the pin groove 510, a part of the rotation shaft 121 may be grooved in the shape of an arc forming a part of a circle.

Likewise, a part of the body 110 is grooved in the shape of an arc forming a part of a circle, but this groove cooperates with the cutout groove formed on the rotation shaft 121 to form a circular groove. ) Can be formed to communicate with.

Therefore, the operator, as shown in Figure 9, at the same time erecting the blade 120 in the vertical direction, the pin groove 510 is formed by the incision groove formed in the body 110 and the incision groove formed in the rotation shaft 121. In a state in which the rotation shaft 121 is rotated so that the fixing pin 520 is inserted into the pin groove 510, the motion of the blade 120 and the rotation shaft 121 in the rotation direction may be limited.

The pin groove 510 and the fixing pin 520 as described above, together with a screw processing portion formed on the outer peripheral surface of the rotation shaft 121 and a screw processing portion formed on the inner peripheral surface of the body 110 that divides the fastening hole 111, the body 110 ) It is possible to further prevent the rotation or flow of the blade 120 rotated by an external force.

Therefore, the scope of the present invention should not be defined by being limited to the described embodiments, and should be defined not only by the claims to be described later, but also by the claims and their equivalents.

The present invention can be applied and sold in the medical industry.

Claims

A body inserted between the vertebrae and the adjacent vertebrae, and provided with a space for filling bone meal;

A blade rotatably provided on the inner side of the body; And

Includes; a locking means for fixing the blade rotated or non-rotated on the body on the inner surface of the body,

The locking means,

A cage for a spine, characterized in that it comprises a fixing protrusion and a groove portion provided on a surface of the body and the blade facing each other and coupled to each other.
The method of claim 1,

The groove portion,

A horizontal state maintenance groove coupled to the fixing protrusion when the blade has a horizontal position not exposed to the outside on the space portion of the body;

A vertical state maintenance groove that is coupled to the fixing protrusion when the blade is exposed to the outside on the space portion of the body and has a vertical position; And

And a guide groove that connects the horizontal state maintenance groove and the vertical state maintenance groove to each other, and contacts the fixing protrusion while the blade is rotated.
The method of claim 2,

At a point where the vertical state maintaining groove and the guide groove are connected to each other, a separation prevention jaw is provided to prevent the fixing protrusion inserted into the vertical state maintaining groove from being separated,

A cage for spine, characterized in that at a point where the horizontal state maintaining groove and the guide groove are connected to each other, a round surface is provided to assist the separation of the fixing protrusion inserted into the horizontal state maintaining groove.
The method of claim 2,

The guide groove,

Cage for spine, characterized in that it has a shape inclined upward from a direction in which the horizontal state maintaining groove is formed to a direction in which the vertical state maintaining groove is formed.
The method of claim 2,

Spinal cage, characterized in that it further comprises a; rotating means for rotating the blade and an elastic means provided between the blade and in close contact with the blade to the inner surface of the body.
The method of claim 5,

The rotating means,

An outer bush inserted into a fastening hole formed in the body;

An inner bush rotatably inserted into the outer bush and coupled to the blade; And

And a space portion provided between the inner bush and the outer bush to accommodate the elastic means.
The method of claim 5,

The elastic means,

A cage for a spine comprising any one of a coil spring, a washer spring, and a cylindrical elastic body having an elastic restoring force.
A body inserted between the vertebrae and the adjacent vertebrae, and provided with a space for filling bone meal;

A blade rotatably provided on the inner side of the body; And

Includes; a locking means for fixing the blade rotated or non-rotated on the body on the inner surface of the body,

The locking means,

A cage for spine, characterized in that it restricts rotation of a rotation shaft provided on the blade and rotatably inserted into a fastening hole formed in the body.
The method of claim 8,

The locking means,

When the blade is erected in a vertical direction on the body, the rotation shaft and the portion of the body in which the fastening hole is formed are formed in cooperation with each other; And

A cage for spine comprising a; a fixing pin inserted into the pin groove to limit the rotation of the rotation shaft.
The method of claim 8,

The locking means,

A cage for a spine, characterized in that it is a screw processing unit formed on an outer circumferential surface of the rotation shaft and an inner circumferential surface of the body that partitions the fastening hole.