WO2024029645A1 - Spinal fusion cage having porous structure - Google Patents

Abstract

The present invention is to provide a spinal fusion cage having a porous structure, wherein the spinal fusion cage comprises a mesh-type lower cover integrally formed or detachably installed at a lower opening of the cage so as to easily prevent a bone growth material filled in a chamber body of the cage from being lost or separated by using the mesh-type lower cover, or, the spinal fusion cage comprises a mesh-type lower cover integrally formed or detachably installed at a lower opening of the cage, and a mesh-type upper cover detachably installed at an upper opening of the cage to cover the chamber body after filling the chamber body with a bone growth material through the upper opening of the cage, so as to easily prevent loss or separation of the bone growth material filled in the chamber body of the cage by the mesh type lower cover and upper cover.

Description

Spinal fusion cage with porous structure

The present invention relates to a spinal fusion cage with a porous structure, and more specifically, to a spinal fusion cage with a porous structure that can be inserted between vertebrae to enable fusion, thereby maintaining support and height between vertebrae. will be.

Intervertebral discs, commonly called discs, are located between the vertebrae that make up the human spine. These intervertebral discs support the movement of the spine between the upper and lower vertebrae and serve to absorb and relieve shock.

Among the methods for treating intervertebral disc herniation, spinal fusion is well known as a surgical treatment method, and fusion refers to attaching adjacent bones to each other.

The spinal fusion surgery is a surgical method of removing a damaged disc and then implanting a cage to fuse the neighboring vertebrae above and below in the place of removal. It not only treats structural abnormalities such as intervertebral disc herniation, but also treats vertebral bone transplantation, spinal deviation and It is used for the purpose of fixing curvature, repairing anteriorly displaced vertebral bodies, and restoring the height of fractured vertebral bodies.

Meanwhile, the conventional cage for fusing the vertebrae is manufactured using metal or polymer materials, and includes a chamber body for filling bone growth material, and an upper and lower opening portion formed at the upper and lower portions of the chamber body. It is manufactured with a structure that has:

Accordingly, the spinal fusion surgery includes the steps of removing the damaged disc, filling the chamber body with bone growth material (autologous bone or artificial bone, etc.) through the upper opening of the cage, and filling the chamber body with bone growth material at the site where the disc was removed. It can proceed to the step of inserting the filled cage, and the neighboring vertebrae above and below can be fused by the bone growth material filled in the chamber body of the cage.

However, conventional cages for fusion of vertebrae have the following problems.

First, the chamber body is filled with bone growth material (autologous bone or artificial bone, etc.) to help bone growth through the upper opening of the cage, and then the cage is inserted by impacting between the vertebrae from which the disc has been removed. At this time, there was a problem of loss of bone proliferative material.

That is, during the impact force of inserting the cage between the vertebrae from which the disc has been removed while the chamber body of the cage is filled with bone growth material, the bone growth material within the chamber body is released to the outside through the upper and lower openings of the chamber body. In particular, the bone growth material in the chamber body escapes to the outside through the lower opening below, causing a problem in that the bone growth material that must be present in a certain amount or more in the chamber body of the cage is lost.

Second, the chamber body of the cage must be filled with a certain amount of bone growth material, but as some of the bone growth material is lost during the impact of inserting the cage between the vertebrae from which the disc has been removed, the neighboring vertebrae above and below A problem arises in that liver fusion is not achieved accurately.

The present invention was devised to solve the above-described conventional problems. A mesh-type lower cover is integrally formed or removably mounted on the lower opening of the cage, and is attached to the chamber body of the cage by the mesh-type lower cover. The purpose is to provide a spinal fusion cage with a porous structure that can easily prevent the loss or separation of the filled bone growth material.

In addition, the present invention is to form a mesh-type lower cover integrally with or detachably attach it to the lower opening of the cage, fill the chamber body with bone growth material through the upper opening of the cage, and then attach a mesh-type upper cover to the upper opening. The purpose is to provide a spinal fusion cage with a porous structure that can easily prevent the loss or separation of bone growth material filled in the chamber body of the cage by the mesh-type lower cover and upper cover by being removably mounted. There is.

In order to achieve the above object, the present invention includes: a chamber body having an internal space filled with bone proliferative material; A mesh-type lower cover provided with a structure having a plurality of holes for fusion and integrally formed or removably mounted on the lower opening of the chamber body; and a plurality of spikes that protrude from the upper and lower surfaces of the chamber body and are pressed against the vertebrae. It is configured to include a bone growth material filled in the chamber body through the upper opening of the chamber body, and then when the chamber body is impacted and inserted between the vertebrae from which the disc has been removed, bone is formed by the mesh-type lower cover. Provided is a spinal fusion cage with a porous structure that prevents growth material from being lost or separated to the outside.

In particular, a mesh-type upper cover having a plurality of holes for fusion is further installed in a removable upper opening portion of the chamber body.

Preferably, guide coupling grooves are formed on both inner surfaces of the upper opening of the chamber body, and guide coupling protrusions are formed on both sides of the mesh-type upper cover to be inserted and fastened into the guide coupling grooves.

In addition, the rear portion of the chamber body is characterized in that fastening grooves and fastening holes into which the surgical gun is fastened are formed side by side and spaced apart.

By solving the above problems, the present invention provides the following effects.

First, with a mesh-type lower cover integrally formed or removably mounted on the lower opening of the cage, bone growth material is filled into the chamber body through the upper opening of the cage, and then the cage is placed between the vertebrae from which the disc was removed. When inserting while impacting, the mesh-type lower cover can prevent the bone growth material from being lost or separated to the outside.

Second, by attaching a removable mesh-type upper cover to the upper opening of the cage, when the cage is inserted with impact between the vertebrae from which the disc has been removed, bone growth material is removed by the mesh-type lower cover and the mesh-type upper cover. This can prevent it from being lost or separated from the outside.

Third, by preventing the bone growth material in the chamber body of the cage from being lost or separated to the outside, a certain amount of bone growth material for bone growth remains in the chamber body of the cage, and as a result, a certain amount of bone growth material is mesh-shaped. By proliferating through a number of fusion holes formed in the upper and lower covers, adjacent vertebrae above and below can be easily fused.

1A, 1B, and 1C are a perspective view, plan view, and side view showing a spinal fusion cage with a porous structure according to a first embodiment of the present invention;

Figures 2a, 2b, and 2c are a perspective view, plan view, and side view showing a spinal fusion cage with a porous structure according to a second embodiment of the present invention;

3A, 3B, and 3C are a perspective view, plan view, and side view showing a spinal fusion cage with a porous structure according to a third embodiment of the present invention;

Figures 4a, 4b, and 4c are a perspective view, top view, and bottom view showing a spinal fusion cage with a porous structure according to a fourth embodiment of the present invention;

Figure 5 is a schematic diagram showing a surgical tendon fastened to a spinal fusion cage with a porous structure according to the present invention;

Figure 6 is a schematic diagram showing the direction in which the spinal fusion cage with a porous structure according to the present invention is inserted into the spine;

Figure 7 is a schematic partial cross-sectional view showing a state in which the fusion hole formed in the mesh-type lower cover is tapered to gradually become narrower toward the bottom;

Figure 8 is a schematic partial cross-sectional view showing a burr formed around the bottom of the fusion hole formed in the mesh-type lower cover;

Figure 9 is a schematic partial cross-sectional view showing threads formed on the inner peripheral surface of the fusion hole formed in the mesh-type lower cover;

Figure 10 is a schematic diagram showing that the upper inner peripheral surface of the fusion hole formed in the mesh-type lower cover is tapered to gradually become narrower toward the bottom, threads are formed on the lower inner peripheral surface of the tapered portion, and a burr is formed around the lower end of the fusion hole. partial cross section,

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

The spinal fusion cage with a porous structure for each embodiment according to the present invention is manufactured to have a different overall external shape depending on the insertion direction and position of the vertebrae, but basically consists of a chamber body having an internal space filled with bone growth material and the chamber body. It is composed of a mesh-type lower cover that is integrally formed or removably mounted on the lower opening, and a plurality of spikes that protrude from the upper and lower surfaces of the chamber body and are pressed against the vertebrae, thereby opening the upper opening of the chamber body. After filling the chamber body with bone growth material, when inserting the chamber body by impacting it between the vertebrae from which the disc has been removed, the mesh-type lower cover prevents the bone growth material from being lost or separated to the outside. There is a characteristic at one point.

First embodiment

The attached Figures 1A, 1B and 1C are a perspective view, plan view and side view showing a spinal fusion cage with a porous structure according to the first embodiment of the present invention.

The spinal fusion cage 100 with a porous structure according to the first embodiment of the present invention is an ALIF (Anterior Lumbar Interbody Fusion) type with a shape to be inserted and fastened to the front position from the front direction of the vertebrae, and the bone growth material is A chamber body 110 having a filled internal space and a plurality of holes 122 for fusion are provided in a structure formed through a predetermined interval and formed integrally with the lower opening 112 of the chamber body 110. It is configured to include a mesh-type lower cover 120 that is mounted to be removable or removable, and a plurality of spikes 130 that protrude from the upper and lower surfaces of the chamber body 110 in a sawtooth cross-sectional shape and are pressed against the vertebrae.

Accordingly, the upper opening 114 of the chamber body 110 is maintained in an open state, and the lower opening 112 of the chamber body 110 is blocked by the mesh-type lower cover 120. However, the internal space of the chamber body 110 is in communication with the outside through a plurality of fusion holes 122 formed in the mesh-type lower cover 120.

Therefore, spinal fusion surgery using the cage 100 according to the first embodiment includes the steps of removing the damaged disc, and inserting bone growth material (autologous bone or filling the artificial bone, etc.), and inserting a cage 100 filled with bone growth material into the spot where the disc was removed. As shown in FIG. 6, the spinal fusion cage 100 with a porous structure is inserted from the front of the vertebrae. It may proceed to the stage of insertion and fastening in the front position.

At this time, the surgical gun 150 is fastened to the fastening groove 117 and the fastening hole 118 formed on the rear part of the chamber body 110, as shown in FIG. 5, and the operator holds the surgical gun 150. The cage 100 filled with bone growth material can be easily inserted into the position where the disc was removed.

Based on the spinal fusion surgery using the cage 100 according to the first embodiment as above, a plurality of spikes 130 formed on the upper surface of the chamber body 110 are pressed to the upper vertebrae, and the chamber body 110 As the plurality of spikes 130 formed on the bottom are pressed against the lower vertebrae, the cage 100 supports the neighboring vertebrae above and below while maintaining the original spacing.

In addition, based on the spinal fusion surgery using the cage 100 according to the above first embodiment, the bone growth material filled in the chamber body 110 of the cage 100 is connected to the upper vertebrae through the upper opening 114. It can be fused, and can be fused with the lower vertebrae through the fusion holes 122 of the mesh-type lower cover 120.

In particular, since the mesh-type lower cover 120 is integrally formed or removably mounted on the lower opening 112 of the cage 100, the chamber body 110 is filled with bone growth material, and then the cage ( When 100) is inserted while impacting between the vertebrae from which the disc has been removed, the mesh-type lower cover 120 can easily prevent the bone growth material from being lost or separated from the lower side.

Moreover, the bone growth material in the chamber body 110 of the cage 100 is blocked and prevented from being lost or separated to the outside by the mesh-type lower cover 120, so that the bone growth material in the chamber body 110 of the cage 100 is blocked and prevented. More than a certain amount of bone growth material for bone growth remains, and accordingly, more than a certain amount of bone growth material filled in the chamber body 110 is fused with the upper vertebrae through the upper opening 114, and at the same time, the mesh-type lower cover ( By fusing with the lower vertebrae through the fusion holes 122 of 120), neighboring vertebrae above and below can be easily fused with each other.

Second embodiment

The attached FIGS. 2A, 2B, and 2C are a perspective view, plan view, and side view showing a spinal fusion cage with a porous structure according to a second embodiment of the present invention.

The spinal fusion cage 100 with a porous structure according to the second embodiment of the present invention is an OLIF (Obliqe Lateral Interbody Fusion) type that has a shape to be inserted and fastened to the anterior lateral position of the vertebrae, and similarly, the bone growth material is A chamber body 110 having a filled internal space and a plurality of holes 122 for fusion are provided in a structure formed through a predetermined interval and formed integrally with the lower opening 112 of the chamber body 110. It is configured to include a mesh-type lower cover 120 that is mounted to be removable or removable, and a plurality of spikes 130 that protrude from the upper and lower surfaces of the chamber body 110 in a sawtooth cross-sectional shape and are pressed against the vertebrae.

Accordingly, the upper opening 114 of the chamber body 110 is maintained in an open state, and the lower opening 112 of the chamber body 110 is blocked by the mesh-type lower cover 120. However, the internal space of the chamber body 110 is in communication with the outside through a plurality of fusion holes 122 formed in the mesh-type lower cover 120.

Likewise, spinal fusion surgery using the cage 100 according to the second embodiment includes the steps of removing the damaged disc, and inserting bone growth material (autologous bone or artificial bone, etc.), and inserting a cage 100 filled with bone growth material into the spot where the disc was removed. As shown in FIG. 6, the spinal fusion cage 100 with a porous structure is placed in the front and side of the vertebrae. It may proceed to the stage of inserting and fastening into position.

At this time, the surgical gun 150 is fastened to the fastening groove 117 and the fastening hole 118 formed on the rear part of the chamber body 110, as shown in FIG. 5, and the operator holds the surgical gun 150. The cage 100 filled with bone growth material can be easily inserted into the position where the disc was removed.

Based on the spinal fusion surgery using the cage 100 according to the second embodiment above, a plurality of spikes 130 formed on the upper surface of the chamber body 110 are pressed to the upper vertebrae, and the chamber body 110 As the plurality of spikes 130 formed on the bottom are pressed against the lower vertebrae, the cage 100 supports the neighboring vertebrae above and below while maintaining the original spacing.

In addition, based on the spinal fusion surgery using the cage 100 according to the second embodiment as above, the bone growth material filled in the chamber body 110 of the cage 100 is connected to the upper vertebrae through the upper opening 114. It can be fused, and can be fused with the lower vertebrae through the fusion holes 122 of the mesh-type lower cover 120.

In particular, since the mesh-type lower cover 120 is integrally formed or removably mounted on the lower opening 112 of the cage 100, the chamber body 110 is filled with bone growth material, and then the cage ( When 100) is inserted while impacting between the vertebrae from which the disc has been removed, the mesh-type lower cover 120 can easily prevent the bone growth material from being lost or separated from the lower side.

Moreover, the bone growth material in the chamber body 110 of the cage 100 is blocked and prevented from being lost or separated to the outside by the mesh-type lower cover 120, so that the bone growth material in the chamber body 110 of the cage 100 is blocked and prevented. More than a certain amount of bone growth material for bone growth remains, and accordingly, more than a certain amount of bone growth material filled in the chamber body 110 is fused with the upper vertebrae through the upper opening 114, and at the same time, the mesh-type lower cover ( By fusing with the lower vertebrae through the fusion holes 122 (120), neighboring vertebrae above and below can be easily fused with each other.

Third embodiment

The attached Figures 3A, 3B and 3C are a perspective view, plan view and side view showing a spinal fusion cage with a porous structure according to a third embodiment of the present invention.

The spinal fusion cage 100 with a porous structure according to the third embodiment of the present invention is a TLIF (Transforaminal Lumbar Interbody Fusion) type with a shape to be inserted and fastened to the rear lateral position of the vertebrae, and similarly, the bone growth material is A chamber body 110 having a filled internal space and a plurality of holes 122 for fusion are provided in a structure formed through a predetermined interval and formed integrally with the lower opening 112 of the chamber body 110. It is configured to include a mesh-type lower cover 120 that is mounted to be removable or removable, and a plurality of spikes 130 that protrude from the upper and lower surfaces of the chamber body 110 in a sawtooth cross-sectional shape and are pressed against the vertebrae.

Accordingly, the upper opening 114 of the chamber body 110 is maintained in an open state, and the lower opening 112 of the chamber body 110 is blocked by the mesh-type lower cover 120. However, the internal space of the chamber body 110 is in communication with the outside through a plurality of fusion holes 122 formed in the mesh-type lower cover 120.

Likewise, spinal fusion surgery using the cage 100 according to the third embodiment includes the steps of removing the damaged disc, and inserting bone growth material (autologous bone or artificial bone, etc.), and inserting a cage 100 filled with bone growth material into the spot where the disc was removed. As shown in FIG. 6, the spinal fusion cage 100 with a porous structure is placed toward the back and side of the vertebra. It may proceed to the stage of inserting and fastening into position.

At this time, the surgical gun 150 is fastened to the fastening groove 117 and the fastening hole 118 formed on the rear part of the chamber body 110, as shown in FIG. 5, and the operator holds the surgical gun 150. The cage 100 filled with bone growth material can be easily inserted into the position where the disc was removed.

Based on the spinal fusion surgery using the cage 100 according to the third embodiment as above, a plurality of spikes 130 formed on the upper surface of the chamber body 110 are pressed to the upper vertebrae, and the chamber body 110 As the plurality of spikes 130 formed on the bottom are pressed against the lower vertebrae, the cage 100 supports the neighboring vertebrae above and below while maintaining the original spacing.

In addition, based on the spinal fusion surgery using the cage 100 according to the third embodiment as above, the bone growth material filled in the chamber body 110 of the cage 100 is connected to the upper vertebrae through the upper opening 114. It can be fused, and can be fused with the lower vertebrae through the fusion holes 122 of the mesh-type lower cover 120.

In particular, since the mesh-type lower cover 120 is integrally formed or removably mounted on the lower opening 112 of the cage 100, the chamber body 110 is filled with bone growth material, and then the cage ( When 100) is inserted while impacting between the vertebrae from which the disc has been removed, the mesh-type lower cover 120 can easily prevent the bone growth material from being lost or separated from the lower side.

Moreover, the bone growth material in the chamber body 110 of the cage 100 is blocked and prevented from being lost or separated to the outside by the mesh-type lower cover 120, so that the bone growth material in the chamber body 110 of the cage 100 is blocked and prevented. More than a certain amount of bone growth material for bone growth remains, and accordingly, more than a certain amount of bone growth material filled in the chamber body 110 is fused with the upper vertebrae through the upper opening 114, and at the same time, the mesh-type lower cover ( By fusing with the lower vertebrae through the fusion holes 122 (120), neighboring vertebrae above and below can be easily fused with each other.

Embodiment 4

The attached FIGS. 4A, 4B, and 4C are a perspective view, top view, and bottom view showing a spinal fusion cage with a porous structure according to a fourth embodiment of the present invention.

The spinal fusion cage 100 with a porous structure according to the fourth embodiment of the present invention includes a chamber body 110 having an internal space filled with bone growth material and a plurality of fusion holes 122 spaced at predetermined intervals. A mesh-type lower cover 120 is provided in a penetrating structure and is integrally formed or detachably mounted on the lower opening 112 of the chamber body 110, and on the upper and lower surfaces of the chamber body 110. A mesh type composed of a plurality of spikes 130 that protrude into a sawtooth cross-sectional shape and are pressed against the vertebrae, and a plurality of holes 142 for fusion are formed in the upper opening 114 of the chamber body 110. It is characterized in that the upper cover 140 is mounted in a removable manner.

At this time, guide coupling grooves 116 are formed on both inner surfaces of the upper opening 114 of the chamber body 110, and guide coupling protrusions 146 are formed on both sides of the mesh-type upper cover 140, When inserting and fastening the mesh-type upper cover 140 into the upper opening 114 of the chamber body 110, the guide coupling protrusion 146 is inserted and fastened into the guide coupling groove 116, thereby forming the chamber body ( The mesh-type upper cover 140 in which a plurality of holes 142 for fusion are formed can be easily mounted on the upper opening 114 of the 110).

Accordingly, the upper opening 114 of the chamber body 110 is maintained in a blocked state by the mesh-type upper cover 140, and the lower opening 112 of the chamber body 110 is also maintained in a blocked state by the mesh-type upper cover 140. Although it is maintained in a blocked state by the cover 120, the inner space of the chamber body 110 communicates with the outside of the upper side through the fusion hole 142 formed in the mesh-type upper cover 140, and the mesh The lower part is in communication with the outside through a plurality of fusion holes 122 formed in the mold lower cover 120.

Likewise, spinal fusion surgery using the cage 100 according to the fourth embodiment includes the steps of removing the damaged disc, and inserting bone growth material (autologous bone or It may proceed with a step of filling with artificial bone, etc.) and a step of inserting a cage 100 filled with bone growth material in the place where the disc was removed.

At this time, the surgical gun 150 is fastened to the fastening groove 117 and the fastening hole 118 formed on the rear part of the chamber body 110, as shown in FIG. 5, and the operator holds the surgical gun 150. The cage 100 filled with bone growth material can be easily inserted into the position where the disc was removed.

Based on the spinal fusion surgery using the cage 100 according to the fourth embodiment above, a plurality of spikes 130 formed on the upper surface of the chamber body 110 are pressed to the upper vertebrae, and the chamber body 110 As the plurality of spikes 130 formed on the bottom are pressed against the lower vertebrae, the cage 100 supports the neighboring vertebrae above and below while maintaining the original spacing.

In addition, based on the spinal fusion surgery using the cage 100 according to the fourth embodiment above, the bone growth material filled in the chamber body 110 of the cage 100 is formed in the fusion hole of the mesh-type upper cover 140 ( 142) can be fused with the upper vertebrae, and can be fused with the lower vertebrae through the fusion holes 122 of the mesh-type lower cover 120.

In particular, a mesh-type lower cover 120 is integrally formed or removably mounted on the lower opening 112 of the cage 100, and a mesh-type upper cover 120 is provided on the upper opening 114 of the cage 100. Since (140) is mounted in a removable state, when the chamber body 110 is filled with bone growth material and then the cage 100 is inserted while impacting between the vertebrae from which the disc has been removed, the mesh-type upper cover ( 140), it is possible to easily prevent the bone growth material from being lost or escaped to the outside of the upper side, and the mesh-type lower cover 120 can easily prevent the bone growth material from being lost or escaped to the outside of the lower side. can do.

Moreover, the loss or escape of the bone growth material in the chamber body 110 of the cage 100 is blocked and prevented by the mesh-type upper cover 140 and the mesh-type lower cover 120, so that the cage 100 ), more than a certain amount of bone growth material for bone growth remains in the chamber body 110, and accordingly, more than a certain amount of bone growth material filled in the chamber body 110 is stored in the fusion hole of the mesh-type upper cover 140 ( 142) are fused with the upper vertebrae and at the same time are fused with the lower vertebrae through the fusion holes 122 of the mesh-type lower cover 120, so that neighboring vertebrae above and below can be easily fused with each other. .

Figure 7 is a schematic partial cross-sectional view showing another embodiment of the fusion hole 122' formed in the mesh-type lower cover 120'. The fusion hole 122' is formed to be tapered to gradually become narrower toward the bottom. there is.

The tapered fusion hole 122' serves to induce the bone growth material in the chamber body 110 to flow downward more slowly than the cylindrical fusion hole 122.

The fusion hole 122' of this type allows a certain amount of bone growth material for bone growth to remain in the chamber body 110 of the cage 100, and at the same time, the fusion hole of the mesh-type lower cover 120' By fusing with the lower vertebrae through (122'), the lower neighboring vertebrae can be easily fused with each other.

Figure 8 is a schematic partial cross-sectional view showing another embodiment of the fusing hole 122" formed in the mesh-type lower cover 120", and a burr 122a is formed around the bottom of the fusing hole 122". It is formed.

In the present invention, when the cage 100 is inserted between the upper and lower neighboring vertebrae to support the vertebrae while maintaining the original spacing, the lower burrs 122a of the fusion hole 122" move toward the lower vertebrae. By bonding with a portion of the flowing bone growth material, the gap between the cage 100, the lower vertebrae, and the bone growth material is more firmly fixed.

Figure 9 is a schematic partial cross-sectional view showing another embodiment of the fusion hole 122"' formed in the mesh-type lower cover 120"', and the inner peripheral surface of the fusion hole 122"' has threads 122b. It is formed.

In this invention, when the cage 100 is inserted between neighboring vertebrae above and below to maintain and support the vertebrae at their original spacing, bone growth material flows toward the lower vertebrae through the fusion hole 122". A portion of is attached to the screw thread (122b) to ensure a more solid fixation between the cage (100), the lower vertebrae, and the bone growth material.

Figure 10 is another embodiment to which all the features of Figures 7 to 9 are applied, in which the upper inner peripheral surface of the fusion hole (122"") formed in the mesh-type lower cover (120"") is tapered to gradually become narrower toward the bottom. threads 122b' are formed on the lower inner peripheral surface of the tapered portion, and a burr 122a' is formed around the lower end of the fusing hole 122"".

The tapered portion of the fusion hole 122"" of the present invention serves to induce the bone growth material in the chamber body 110 to flow downward more slowly than the cylindrical fusion hole 122.

This type of fusion hole 122"" allows a certain amount of bone growth material for bone growth to remain in the chamber body 110 of the cage 100, while at the same time allowing the fusion of the mesh-type lower cover 120"". By fusing with the lower vertebrae through the holes 122"", the neighboring vertebrae below can be easily fused with each other.

In addition, in the present invention, when the cage 100 is inserted between neighboring vertebrae above and below to maintain and support the vertebrae at their original spacing, bone flowing toward the lower vertebrae through the fusion hole 122"" A portion of the growth material is attached to the screw thread 122b', thereby allowing the cage 100, the lower vertebrae, and the bone growth material to be more firmly fixed.

In addition, in the present invention, when the cage 100 is inserted between the upper and lower neighboring vertebrae to support the vertebrae while maintaining the original spacing, the lower burrs 122a' of the fusion hole 122"" move downward. As it binds to a portion of the bone growth material flowing down the vertebrae, it becomes more firmly fixed between the cage 100, the lower vertebrae, and the bone growth material.

Claims (4)

A chamber body 110 having an internal space filled with bone growth material; It is provided with a structure in which a plurality of fusion holes 122 (122') (122") (122"') (122"") are formed and is formed integrally with the lower opening 112 of the chamber body 110. A mesh-type lower cover (120)(120')(120")(120"')(120"") that is removably mounted; and A plurality of spikes 130 that protrude from the upper and lower surfaces of the chamber body 110 and are pressed against the vertebrae; It is composed including, When the chamber body 110 is filled with bone growth material through the upper opening 114 of the chamber body 110 and then the chamber body 110 is inserted while impacting between the vertebrae from which the disc has been removed, A porous structure characterized by preventing bone growth material from being lost or separated to the outside by the mesh-type lower cover (120) (120') (120") (120"') (120""). Spinal fusion cage with. In claim 1, A mesh-type upper cover 140 having a plurality of holes 142 for fusion is further mounted in a removable manner at the upper opening 114 of the chamber body 110; Guide coupling grooves 116 are formed on both inner surfaces of the upper opening 114 of the chamber body 110, and both sides of the mesh-type upper cover 140 are inserted into and fastened to the guide coupling grooves 116. A spinal fusion cage with a porous structure characterized by the formation of guide coupling protrusions (146). In claim 1, A spinal fusion cage with a porous structure, characterized in that a fastening groove 117 and a fastening hole 118 into which the surgical gun 150 is fastened are formed in parallel and spaced apart from each other on the rear part of the chamber body 110. In claim 1, The upper inner peripheral surface of the fusing hole (122"") formed in the mesh-type lower cover (120"") is tapered to gradually become narrower toward the lower side, and screw threads (122b') are formed on the lower inner peripheral surface of the tapered portion, and fusing. A spinal fusion cage with a porous structure, characterized in that a burr (122a') is formed around the bottom of the dragon hole (122"").

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