Intervertebral body healing material

Abstract

An intervertebral body fusion support material is provided. An intervertebral body fusion support material according to one aspect of the present invention includes a screw head and a screw body extending from the screw head in a first direction and having threads on its outer circumference; a body including a screw housing in which the screw head is rotatably housed and which has a through portion that penetrates along a second direction inclined with respect to the first direction and which has a base plate disposed on one side of the screw housing on the second direction side and which has a base hole communicating with the through portion; a guide member including a guide body in which the screw housing is housed and to which the screw body is rotatably coupled, and which is capable of relative movement with respect to the body in a direction parallel to the first direction in response to the rotation of the screw; a moving plate movably connected to the body and displaced by the relative movement between the body and the guide member; and one or more bar-shaped members disposed across the through portion.

Description

Technical Field

[0001] The present invention relates to an intervertebral body fusion retaining material, and more particularly to an intervertebral body fusion retaining material applicable to an implant that requires in vivo expansion.

Background Art

[0002] An intervertebral body fusion retaining material is a device used in a fusion, which is a surgical treatment method for spinal diseases. When a disk ruptures or weakens due to illness or accident, it compresses the spinal nerve and causes pain. In such a case, the damaged disk is removed, and an intervertebral body fusion retaining material that restores and maintains the interval and lordosis between the vertebrae in the intervertebral body from which the damaged part has been removed is inserted, and a fusion between the vertebrae is performed.

[0003] As described above, the intervertebral body fusion retaining material is inserted into the intervertebral body between the vertebrae from which the degenerated disk has been removed, and secures a space for bone growth for fusion. Further, the intervertebral body fusion retaining material secures the interval between the vertebral bodies, reduces pain, and restores the stability of the spine.

[0004] Normally, intervertebral body fusion retaining materials are individually commercialized according to the lordosis and height of the spine. However, when performing surgery through a posterior approach to the spine, it is often difficult to use an intervertebral body fusion retaining material having the lordosis and height required by the patient. This is because most patients requiring fusion have undergone degenerative changes in the spine, and thus it is difficult to secure a wide space for implanting the intervertebral body fusion retaining material.

[0005] Under such circumstances, an expandable intervertebral body fusion retaining material that can be easily inserted into the disc space due to its low height at the time of implantation and can expand the lordosis or height after being positioned at the desired point has been disclosed. However, most of the conventional expandable intervertebral body fusion retaining materials cannot expand both the lordosis and the height, and are manufactured in a form that can expand either the lordosis or the height.

[0006] Conventionally, a method was used in which bone graft material was filled after the placement of intervertebral body fusion retainers to promote bone formation. However, such bone graft materials were focused on promoting bone formation and did not contribute to structural stability such as external forces.

[0007] Intervertebral body fusion protectors are used long-term after implantation, while the patient's bone grows inside in an expanded state. Since the bone formation process is guided by the position and shape of the bone graft material and intervertebral body fusion protector, it is extremely important to ensure structural stability so that the implanted intervertebral body fusion protector maintains its rigidity during long-term use and throughout the bone formation process.

[0008] Consequently, there is a growing need to develop intervertebral body fusion propellants that allow for stable operation while simultaneously adjusting both the lordosis angle and height, and that promote bone formation while maintaining a robust structure during the bone formation and maintenance process. [Overview of the project] [Problems that the invention aims to solve]

[0009] The present invention aims to solve the problems of the prior art described above, and the object of the present invention is to provide an intervertebral body fusion support material that can adjust both the lordosis angle and height through a drive system that can be switched between nonlinear motion and linear motion.

[0010] Another object of the present invention is to provide an intervertebral body fusion support material that can maintain a robust structure even after implantation, expansion, and installation.

[0011] Another object of the present invention is to provide an intervertebral body fusion retainer that maintains structural rigidity while increasing the efficiency of bone formation and bone fusion.

[0012] The problems that the present invention addresses are not limited to those mentioned above, and any other problems not mentioned can be clearly understood by an ordinary person skilled in the art from the following description. [Means for solving the problem]

[0013] According to one aspect of the present invention, an intervertebral body fusion support material is provided, comprising: a screw head; a screw body including a screw head; a screw body extending from the screw head in a first direction and having threads on its outer circumference; a body including a screw housing in which the screw head is rotatably housed and which has a through-port extending along a second direction inclined with respect to the first direction; a base plate disposed on one side of the screw housing on the second direction side and which has a base hole communicating with the through-port; a guide member including a guide body in which the screw housing is housed and to which the screw body is rotatably coupled, and which is capable of relative movement with respect to the body in a direction parallel to the first direction in response to the rotation of the screw; a moving plate movably connected to the body and displaced by the relative movement between the body and the guide member; and one or more bar-shaped members disposed across the through-port.

[0014] In this case, the bar-shaped member may be positioned at the end of the through-section on the second direction side.

[0015] In this case, the bar-shaped member may be positioned across the through portion along the first direction.

[0016] In this case, multiple bar-shaped members may be arranged parallel to each other.

[0017] In this case, multiple bar-shaped members may be arranged at different heights, spaced apart from one another.

[0018] In this case, although the bar-shaped members are provided in multiple quantities, at least two or more of the bar-shaped members may be positioned so that at least a portion of them overlaps when viewed in the second direction.

[0019] In this case, the base plate includes one or more resistance protrusions formed protruding from one surface on the second direction side, and the resistance protrusions may extend in a third direction perpendicular to the first direction.

[0020] In this case, although the resistive protrusions are formed in multiple units, at least one of the resistive protrusions may be formed on one surface of the base plate on the second direction side in a portion where the base hole is not located, and at least one of the resistive protrusions may be formed on one surface of the base plate on the second direction side such that its end portion crosses the base hole along the third direction.

[0021] In this case, a porous member made of a porous material may be provided inside the base hole.

[0022] In this case, the porous member may be provided in a form corresponding to the shape of the base hole.

[0023] In this case, although the second direction is formed at an angle perpendicular to the first direction, the area of ​​the cross-section obtained by cutting the base hole perpendicular to the second direction may be larger than the area of ​​the cross-section obtained by cutting the end of the through portion on the second direction side perpendicular to the second direction.

[0024] In this case, the moving plate includes one or more upper resistance protrusions formed projecting from one surface furthest from the base plate, and the upper resistance protrusions may extend in a third direction perpendicular to the first direction. [Effects of the Invention]

[0025] With the above configuration, the intervertebral body fusion retainer according to one aspect of the present invention allows for the adjustment of both the lordosis angle and height of the spine through a plate that, after the anterior portion rises vertically in response to the rotation of a screw to form a predetermined angle, moves vertically as a whole to increase its height. This ensures that an appropriate lordosis angle and height for each patient can be secured during fusion surgery.

[0026] Another aspect of the present invention relates to an intervertebral body fusion support material that can effectively resist external forces applied from different directions by reinforcing the interior with bar-shaped members perpendicular to the extension direction of projections formed on the contact surface of the plate, so as to maintain structural rigidity.

[0027] The intervertebral body fusion retainer according to another aspect of the present invention can further ensure structural stability by forming the base hole and the through-hole with different cross-sectional areas along the bone growth path so that bone can grow.

[0028] The intervertebral body fusion retainer according to another aspect of the present invention can form an efficient structure that promotes bone fusion initially and then ensures structural stability while promoting additional bone fusion through a multi-stage structure in which a porous member and a bar-shaped member are sequentially arranged along the bone growth path.

[0029] The effects of the present invention are not limited to the above effects, and it should be understood that the present invention includes all effects that can be inferred from the configuration of the invention described in the detailed description or claims of the present invention.

Brief Description of the Drawings

[0030] [Figure 1] It is a rear perspective view of the intervertebral body fusion retainer according to an embodiment of the present invention. [Figure 2] It is a lower perspective view of the intervertebral body fusion retainer according to an embodiment of the present invention. [Figure 3] It is an exploded perspective view of the intervertebral body fusion retainer according to an embodiment of the present invention. [Figure 4] It is a top view of the intervertebral body fusion retainer according to an embodiment of the present invention. [Figure 5] It is a cross-sectional view showing the cross-section of the intervertebral body fusion retainer along I-I' of FIG. 4. [Figure 6] It is a cross-sectional view showing the cross-section of the intervertebral body fusion retainer along II-II' of FIG. 4. [Figure 7] It is a cross-sectional view including the cross-section of the intervertebral body fusion retainer according to an embodiment of the present invention cut in a direction perpendicular to the direction of the screw body where the screw head is located. [Figure 8] It is a rear perspective view of the intervertebral body fusion retainer according to an embodiment of the present invention in a state where the anterior bending angle is expanded. [Figure 9]Figure 8 is a left side view of the intervertebral body fusion support material. [Figure 10] This is a side cross-sectional view showing the process by which the angles of the anterior guide portion and the anteriorly guided portion of an intervertebral body fusion support material according to one embodiment of the present invention become aligned. [Figure 11] This is a perspective view of an intervertebral body fusion support plate according to one embodiment of the present invention, showing an increased height after expansion of the lordotic angle. [Figure 12] Figure 11 is a left side view of the intervertebral body fusion support material shown in the diagram. [Figure 13] This diagram shows the process by which a vertebral body fusion support material according to one embodiment of the present invention is used in PLIF. [Figure 14] This diagram shows the process by which an intervertebral body fusion support material according to one embodiment of the present invention is used in TLIF. [Modes for carrying out the invention]

[0031] Hereinafter, embodiments of the present invention will be described in detail with reference to the attached drawings, so that those with ordinary skill in the art to which the present invention pertains can easily implement it. The present invention can be embodied in various different forms and is not limited to the embodiments described herein. In order to clearly illustrate the present invention, parts that are not relevant to the description have been omitted from the drawings, and the same or similar reference numerals have been used throughout the specification for components that are the same or similar.

[0032] Words and terms used in this specification and in the claims should not be interpreted in a manner limited to their ordinary or dictionary meanings, but rather in a manner consistent with the technical idea of ​​the present invention, in accordance with the principle that inventors may define terms and concepts in order to best describe their invention.

[0033] In this specification, terms such as “includes” or “having” are intended to describe the presence of features, figures, stages, operations, components, parts, or combinations thereof as described in the specification, and should be understood not to preemptively exclude the possibility of the presence or addition of one or more other features, figures, stages, operations, components, parts, or combinations thereof.

[0034] The thickness and size of the components were exaggerated in the drawings to clearly represent their characteristics, and the thickness and size of the components shown in the drawings are not necessarily identical to those in reality.

[0035] In the following explanation of the drawings, each direction is defined based on the coordinate axes shown in Figure 1. More specifically, the positive z-axis is defined as the upper side, and the negative z-axis is defined as the lower side. The positive y-axis is defined as the left side, and the negative y-axis is defined as the right side. The positive x-axis is defined as the front, and the negative x-axis is defined as the back.

[0036] In the following description, in order to clarify the features of the present invention, descriptions of some components may be omitted.

[0037] The intervertebral body fusion support material 1 according to one embodiment of the present invention is a device used in fusion surgery, a surgical treatment method for spinal diseases. The intervertebral body fusion support material 1 according to one embodiment of the present invention includes a main body 100 as a drive system. Furthermore, the intervertebral body fusion support material 1 according to one embodiment of the present invention is inserted between vertebrae from which a degenerative disc has been removed and performs the role of supporting the space between the vertebral bodies until fusion of the spine occurs.

[0038] An intervertebral body fusion support material 1 according to one embodiment of the present invention ensures that all lordosis and height of the spine are maintained.

[0039] Figure 1 is a rear perspective view of an intervertebral body fusion support material according to one embodiment of the present invention. Figure 2 is a lower perspective view of an intervertebral body fusion support material according to one embodiment of the present invention. Figure 3 is an exploded perspective view of an intervertebral body fusion support material according to one embodiment of the present invention. Figure 4 is a top view of an intervertebral body fusion support material according to one embodiment of the present invention. Figure 5 is a cross-sectional view illustrating a cross-section of the intervertebral body fusion support material along line I-I' in Figure 4. Figure 6 is a cross-sectional view illustrating a cross-section of the intervertebral body fusion support material along line II-II' in Figure 4.

[0040] Referring to Figures 1 to 3, one embodiment of the present invention of the intervertebral body fusion support material 1 may include a main body 100, a guide member 200, and a moving plate 300.

[0041] The main body 100 moves relative to the guide member 200 due to the rotation of the screw 110, inducing displacement of the moving plate 300. The main body 100 may include the screw 110, the screw housing 120, the limit torque setting member 130, and the detachment prevention member 140.

[0042] The screw 110 includes a screw head 111 and a screw body 112 extending from the screw head 111 and having threads 112a on its outer surface.

[0043] The screw head 111 has one or more first grooves 111a on its outer circumferential surface. The first grooves 111a may be formed along the longitudinal direction of the screw 110. Multiple first grooves 111a may also be arranged at regular intervals along the circumference of the screw head 111. Meanwhile, between adjacent first grooves 111a, first protrusions 111b are formed that project radially outward relative to the first grooves 111a.

[0044] Furthermore, the screw head 111 may further include a second groove 111c that is continuously recessed along the circumferential direction. The second groove 111c is formed so that a detachment prevention member 140 can be inserted.

[0045] The screw body 112 is connected to the screw head 111 and has threads 112a on its outer surface. The threads 112a of the screw body 112 engage with the guide member 200, transmitting the rotational force of the screw to the guide member 200 when the screw 110 rotates. The rotational force of the screw transmitted to the guide member 200 is converted into a driving force for linear displacement between the screw housing 120 and the guide member 200.

[0046] At this time, the screw 110 can be connected to the guide member 200 with the screw head 111 and the screw body 112 facing a predetermined first direction.

[0047] In this case, the first direction can be forward, that is, the positive direction of the x-axis as viewed in Figures 1-3. Below, as an embodiment of the present invention, the intervertebral body fusion support material 1 will be described with the first direction defined as forward.

[0048] The screw housing 120 rotatably accommodates the screw head 111. The screw body 112 of the screw 110 is screw-coupled to a guide member 200, and when the screw is rotated by a drive tool (not shown) coupled to the screw head 111, the screw housing 120 and the guide member 200 move closer to or further away from each other.

[0049] In one embodiment of the present invention, the intervertebral body fusion support material 1 includes a housing body 121, a screw head arrangement portion 122, a limit torque setting member arrangement portion 123, a detachment prevention member arrangement portion 124, a guide hole 125, a first connecting portion 126, and a base plate 127.

[0050] The housing body 121 may be formed in a box shape with a through-hole 121d that penetrates along a first direction and a second direction inclined at a predetermined angle. The through-hole 121d of the housing body 121 may be filled with bone graft material.

[0051] In this case, the angle between the first and second directions can be 90 degrees, and the second direction can be the vertical direction, that is, the z-axis direction as viewed in Figures 1 to 3.

[0052] The second direction is not necessarily limited to being perpendicular to the first direction, but in the following description of an embodiment of the present invention, the intervertebral body fusion support material 1 will be described with the second direction being vertical.

[0053] The housing body 121 may have a box shape with a through-hole 121d that penetrates vertically. In this case, the left-right width of the housing body 121 may correspond to the left-right width of the portion of the guide member 200 that penetrates vertically through the guide body 210, which will be described later.

[0054] The screw head placement section 122 is formed to penetrate the housing body 121 in the front-to-back direction. More specifically, the screw head placement section 122 is formed to penetrate the front wall 121a of the housing body 121 in the front-to-back direction. With the screw head 111 positioned in the screw head placement section 122, the screw body 112 may protrude forward from the housing body 121.

[0055] Accordingly, the housing body 121 can be provided with a through-hole 121d that penetrates in the front-rear and up-down directions.

[0056] At this time, one or more bar-shaped members 128 may be formed within the through-hole 121d, positioned across the through-hole 121d.

[0057] At this time, since a drive tool (not shown) connected to the screw head 111 for rotating the screw must pass through a portion of the through-hole 121d that penetrates the housing body 121 along the front-rear direction, the bar-shaped member 128 can be formed in a position where the drive tool (not shown) does not pass through.

[0058] For example, the bar-shaped member 128 may be formed at the end of the through-hole 121d on the second direction side, i.e., at the upper or lower end of the through-hole 121d.

[0059] Referring to Figures 4 to 6, as an example, the bar-shaped member 128 is formed at the lower end of the through-hole 121d, but it is not necessarily limited to this, and the bar-shaped member 128 may be formed at the upper end of the through-hole 121d or at both the upper and lower ends.

[0060] The bar-shaped member 128 may be positioned to cross the through portion 121d in a first direction, i.e., in the front-to-back direction.

[0061] Consequently, when an external force is applied to the intervertebral body fusion support material 1 in the anterior-posterior direction, the resistance force of the bar-shaped member 128 against this force can be improved.

[0062] In addition, since the bar-shaped member 128 is positioned along the anterior-posterior direction of the spine, when it is inserted into the spine, it is easy to confirm whether or not bone growth has occurred when radiography such as X-rays is performed.

[0063] Furthermore, by arranging the bar-shaped member 128 so as to cross the through portion 121d along the front-rear direction, the bar-shaped member 128 can be positioned perpendicular to the resistance protrusions 127b, 127c, and 317, which will be described later.

[0064] Accordingly, the bar-shaped member 128 reinforces the resistance against external forces in the front-rear direction, and the resistance protrusions 127b, 127c, and 317 reinforce the resistance against external forces in the left-right direction, thereby ensuring resistance in a direction in which the bar-shaped member 128 and the resistance protrusions 127b, 127c, and 317 complement each other.

[0065] In addition, since both the bar-shaped member 128 and the resistance protrusions 127b, 127c, and 317 can resist external forces applied at an oblique angle to the front-to-back and left-to-right directions, structural stability can be ensured against external forces in various directions.

[0066] Referring to Figures 4 to 6, multiple bar-shaped members 128 can be arranged in parallel.

[0067] More specifically, multiple bar-shaped members 128 can be arranged at different positions and distances from each other in both the left-right and up-down directions. This arrangement allows the bar-shaped members 128 to provide additional resistance to external forces applied in both the left-right and up-down directions.

[0068] Due to the structural effects of such bar-shaped members 128, the bar-shaped members 128 can be formed from a material that is more rigid than bone.

[0069] Furthermore, at least two or more bar-shaped members 128 can be arranged such that at least a portion of them overlaps when viewed from above.

[0070] The bar-shaped member 128 not only ensures additional rigidity in the joint between the fused bone and the intervertebral body fusion-retaining material 1, but also performs the function of ensuring a pathway for bone growth during the bone formation process.

[0071] At this time, by arranging at least two or more bar-shaped members 128 so that at least a portion of them overlap when viewed from above, it is possible to guide the bone to grow in a zigzag direction with the bar-shaped members 128 in between.

[0072] Consequently, after bone fusion, the bar-shaped members 128 can be bonded to the bone in a more organic way, rather than simply in a monotonous manner. Furthermore, by arranging the bar-shaped members 128 so that they partially overlap each other, it becomes possible to arrange them to cover a larger space and area compared to the case where they are not.

[0073] The limit torque setting member arrangement section 123 is formed in the housing body 121 so that the limit torque setting member 130 can be arranged therein. More specifically, the limit torque setting member arrangement section 123 may be formed in the front wall 121a of the housing body 121. In one embodiment of the present invention, the limit torque setting member arrangement section 123 is formed in a manner that surrounds the screw head arrangement section 122 along the circumferential direction. The limit torque setting member arrangement section 123 also has a slot shape that penetrates both sides so that the limit torque setting member 130 can be arranged by penetrating the side surface of the front wall 121a of the housing body 121.

[0074] The detachment prevention member placement section 124 is formed in the housing body 121 so as to be positioned for the detachment prevention member 140. In one embodiment of the present invention, the detachment prevention member placement section 124 is formed by through holes that penetrate both sides of the housing body 121. More specifically, the detachment prevention member placement section 124 penetrates both sides of the front wall 121a of the housing body 121, but is formed so that at least a portion of the detachment prevention member 140 can be inserted into the second groove 111c of the screw head 111.

[0075] The guide hole 125 is formed by penetrating the rear wall 121b of the housing body 121 in the front-rear direction, so that a drive tool (not shown) for rotating the screw can reach the screw head 111 by passing through the portion that penetrates the housing body 121 from top to bottom. The drive tool can reach the screw head 111 through the guide hole 125.

[0076] The first connecting portion 126 is formed in the housing body 121 so as to connect the moving plate 300 so as to be movable in the vertical direction. In one embodiment of the present invention, the first connecting portion 126 is provided on the left and right side walls 121c of the housing body 121. The first connecting portion 126 interlocks with the second connecting portion 340 of the moving plate 300, which will be described later. For example, the first connecting portion 126 may include a groove that is recessed in the vertical direction.

[0077] The base plate 127 can be connected to one side of the housing body 121 on the second side, i.e., the lower surface of the housing body 121. The base plate 127 can be positioned opposite the moving plate 300, which will be described later.

[0078] The base plate 127 can extend forward, backward, and to both sides from the underside of the housing body 121. Accordingly, the base plate 127 can form the lower surface of the intervertebral body fusion support material 1.

[0079] On the other hand, the central portion of the base plate 127 may have a base hole 127a that penetrates vertically so as to communicate with the through portion 121d that penetrates vertically through the housing body 121.

[0080] At this time, one or more resistance protrusions 127b, 127c may be formed on the lower surface of the base plate 127, protruding downward from the base plate 127.

[0081] Although the resistance protrusions 127b and 127c protrude downward from the upper surface of the base plate 127, they can be extended in a third direction perpendicular to the first direction, i.e., in the left-right direction as viewed in Figures 1 to 6.

[0082] Accordingly, although the resistance protrusions 127b and 127c are generally formed in a chisel-like shape extending in the left-right direction, multiple protrusions may be formed in a row along the front-back direction on the lower surface of the base plate 127.

[0083] At this time, a base hole 127a is formed in the base plate 127, penetrating the base plate 127 in the vertical direction. The resistive protrusions 127b and 127c can be classified into resistive protrusions 127b, which are formed in the portion where the base hole 127a is not formed, and resistive protrusions 127c, which are formed in the portion where the base hole 127a is formed.

[0084] In this case, the resistance projection 127b formed in the portion where the base hole 127a is not located may be formed in such a way that it extends entirely in the left-right direction from the base portion adjacent to the lower surface of the base plate 127 to the end portion located at the end of the resistance projection 127b.

[0085] In contrast, the resistive projection 127c formed in the area where the base hole 127a is located may have its bases located on both sides of the base hole 127a, but its end portions may be formed in a manner that connects across the base hole 127a.

[0086] Accordingly, the resistive projection 127c formed in the area where the base hole 127a is located may be formed in a manner that partially covers the lower part of the base hole 127a.

[0087] When the intervertebral body fusion protector 1 is implanted, the lower surface of the base plate 127 may come into direct contact with the vertebral body. At this time, the resistance processes 127b and 127c extend in the left-right direction and protrude from the upper surface of the base plate 127, so that the resistance processes 127b and 127c can perform the function of resisting displacement of the intervertebral body fusion protector 1 in the anterior-posterior direction while it is in contact with the vertebral body.

[0088] Simultaneously, when an external force is applied to the intervertebral body fusion support material 1 in the left-right direction, the resistance processes 127b and 127c can both perform the function of resisting the external force so as not to be damaged.

[0089] In this case, since the resistive projection 127c is also formed in the area where the base hole 127a is located, the space inside the base hole 127a can be protected more stably, and resistance to external forces can be made more stably than when the resistive projection 127b is formed only in the area where the base hole 127a is not located.

[0090] Referring to Figures 5 and 6, a porous member 129 made of a porous material may be provided within the base hole 127a.

[0091] The porous member 129 may be formed from a material and structure that can promote the bone formation process.

[0092] While bone graft material to promote bone formation can be supplied by filling the internal space after the placement of the intervertebral body fusion support material 1, a separate porous member 129 can be pre-installed in the base hole 127a, which is partitioned into a predetermined shape, in a shape corresponding to the internal shape of the base hole 127a.

[0093] In this case, the porous member 129 can be provided in a form corresponding to the internal shape of the base hole 127a before the intervertebral body fusion support material 1 is implanted, so that the porous member 129 can be positioned with minimal dead space.

[0094] Furthermore, since it is possible to minimize dead space without having to separately check whether the porous member 129 completely fills the inside of the base hole 127a after implanting the intervertebral body fusion support material 1, it is possible to perform a fusion procedure that is simple yet reliable.

[0095] In addition, the base hole 127a is the part where bone is generated before the penetration 121d, and it may be possible to place a separate bone graft material optimized for initial bone generation in the base hole 127a.

[0096] Furthermore, since the porous member 129 of the base hole 127a and the resistance protrusions 127b and 127c can both resist external forces from the initial stages of bone formation, it is possible to resist external forces more effectively.

[0097] On the other hand, referring to Figures 5 and 6, when viewed in a cross-section perpendicular to the vertical direction, i.e., in a cross-section in the horizontal direction, the base hole 127a may be formed to have a wider cross-sectional area than the upper or lower end of the through-hole 121d where the bar-shaped member 128 is placed.

[0098] As mentioned above, during the bone formation process, the base hole 127a is located closer to the contact surface than the penetration portion 121d with the vertebral body, so bone may be formed in the base hole 127a before bone is formed in the penetration portion 121d.

[0099] Accordingly, in order to ensure structural stability even in the initial stages of bone formation, the horizontal cross-sectional area of ​​the base hole 127a may be formed to have a larger area than the upper or lower end of the through-hole 121d.

[0100] The base hole 127a has a wide horizontal cross-sectional area, which can promote initial bone formation over a wider area.

[0101] After the implantation and expansion of the intervertebral body fusion support material 1, a separate bone graft material may be filled into the interior of the penetration portion 121d, and a drive tool (not shown) can be inserted, thereby ensuring a relatively wide horizontal cross-sectional area in the vertical central part of the penetration portion 121d. Consequently, the central part of the penetration portion 121d can be made to have a stable structure against external forces.

[0102] In contrast, the vertical end of the through-hole 121d, where the through-hole 121d and the base hole 127a are connected, may be formed with a narrower horizontal cross-sectional area compared to the vertical center of the base hole 127a and the through-hole 121d.

[0103] Accordingly, bar-shaped members 128 are provided at the vertical ends of the through-hole 121d to reinforce structural stability.

[0104] In summary, in the initial stages of bone formation, the base hole 127a, which has a wide horizontal cross-sectional area, promotes bone formation over a wide area and can support the joint between the intervertebral body fusion material 1 and the bone.

[0105] Thereafter, as bone is generated on the vertical end side of the penetration 121d, which has a relatively narrow horizontal cross-sectional area, a highly rigid bar-shaped member 128 is provided so as to cross the penetration 121d to ensure support.

[0106] Subsequently, when the bone enters the vertical center of the penetration portion 121d, which has a relatively wide horizontal cross-sectional area, the bone can fuse and be supported in a wide space, ensuring a stable structure for the intervertebral body fusion support material 1 and the bone joint.

[0107] On the other hand, guide grooves 127d may be provided on both sides of the base plate 127 from the corners toward the limit torque setting member placement section 123 to guide the insertion of the limit torque setting member 130 into the limit torque setting member placement section 123.

[0108] The limit torque setting member 130 is positioned in the screw housing 120 and prevents the screw head 111 from rotating when the torque is less than the limit torque set for the screw head 111, and allows the screw head 111 to rotate when the torque is greater than or equal to the limit torque. In one embodiment of the present invention, the limit torque setting member 130 is inserted into the first groove 111a of the screw head 111, suppresses the rotation of the screw head 111 before the set limit torque is applied, and when the torque is greater than or equal to the limit torque, it can detach from the first groove 111a by the adjacent first projection 111b and allow the rotation of the screw head 111.

[0109] The limit torque setting member 130 may include a member body 131 positioned to surround at least a portion of the screw head 111, and a locking portion 132 projecting toward the screw head 111 from the member body 131 so as to be inserted into the first groove 111a. For example, the member body 131 may be positioned to surround about half of the screw head 111 circumferentially, and the locking portion 132 may project toward the screw head 111 from one end of the member body 131. In this regard, if a torque exceeding the limit torque is applied to the screw 110, the member body 131 may be elastically deformed.

[0110] The anti-detachment member 140 is fixedly positioned in the screw housing 120 with an insertion into a portion of the second groove 111c to prevent the screw 110 from detaching from the screw housing 120. In one embodiment of the present invention, the anti-detachment member 140 may be of the pin type. More specifically, the anti-detachment member 140 may be inserted into an anti-detachment member placement portion 124 formed by through holes penetrating both sides of the housing body 121, with at least a portion of it inserted into the second groove 111c of the screw head 111. The anti-detachment member 140 may also be positioned perpendicular to the screw 110.

[0111] Figure 7 is a cross-sectional view of an intervertebral body fusion support material according to one embodiment of the present invention, including a cross-section cut in a direction perpendicular to the direction of the screw body from the location where the screw head is located.

[0112] Referring to Figure 7, with the locking portion 132 of the limit torque setting member 130 inserted into the first groove 111a, the rotation of the screw 110 is restricted by the locking portion 132 until a torque exceeding the limit torque is applied. This is because the protrusion 111b adjacent to the first groove 111a into which the locking portion 132 is inserted is locked by the locking portion 132, thereby suppressing the rotation of the screw.

[0113] On the other hand, if a torque exceeding the limit torque is applied to the screw 110, the protruding portion 111b of the screw head 111 pushes the locking portion 132 radially outward from the first groove 111a. Consequently, the screw 110 rotates as the screw head 111 rotates. The rotation of the screw 110 can cause the guide member 200, which is engaged with the screw 110, to behave in a certain way.

[0114] The guide member 200 is screw-rotatably connected to the screw body 112 of the screw 110. The guide member 200 is displaced forward or backward while moving relative to the main body 100, and the relative positional change between the guide member 200 and the main body 100 causes displacement of the moving plate 300. The guide member 200 may include a guide body 210, a front guide section 220, a rear guide section 230, a screw hole 240, and a rear hole 250.

[0115] The guide body 210 is formed with a through-hole at the top and bottom. The guide body 210 can have the form of a frame with a through-hole in the central part. The guide body 210 can also have an overall rectangular shape. The housing body 121 of the screw housing 120 of the main body 100 is positioned inside the guide body 210, and the rotation of the screw 110, which is rotatably connected to the screw housing 120, causes the screw housing 120 to move relative to the guide member 200 within the guide body 210. As mentioned above, the through-hole portion of the guide body 210 can have a width corresponding to the width of the housing body 1211 of the main body 100.

[0116] The front guide portion 220 is formed to be inclined toward the front portion of the guide body 210. When the guide member 200 is displaced, the front guide portion 220 guides the forward guided portion 320 of the moving plate 300 and guides the upward movement of the front portion of the moving plate 300. In one embodiment of the present invention, the front guide portion 220 protrudes from both sides of the side wall of the front portion of the guide body 210, but is formed at a predetermined angle so as to be inclined downward from the rear toward the front.

[0117] The rear guide portion 230 is formed to be inclined toward the rear portion of the guide body 210. The rear guide portion 230 guides the rear guided portion 330 of the moving plate 300 when the guide member 200 is displaced. In other words, the rear guide portion 230 guides the upward movement of the rear portion of the moving plate 300. In one embodiment of the present invention, the rear guide portion 230 protrudes from the side walls of the rear portion of the guide body 210 on both sides, but is formed with a predetermined angle so as to be inclined downward from the rear toward the front.

[0118] The screw hole 240 may be formed in front of the guide body 210. The screw hole 240 may be formed penetrating the front side wall of the guide body 210 in the front-rear direction. The screw body 112 of the screw 110 of the main body 100, which is positioned on the guide body 210, may be positioned to engage with the screw hole 240. Accordingly, when the screw 110 is driven, the guide member 200 can move relative to the screw housing 120 of the main body 100 in a forward or backward direction.

[0119] The rear hole 250 communicates with the guide body 210 and is formed at the rear of the guide body 210. More specifically, the rear hole 250 may be formed by penetrating the rear side wall of the guide body 210 in the front-rear direction. The rear hole 250 allows a drive tool for driving the screw 110 of the main body 100 to enter the interior of the guide body 210. The drive tool that enters the guide body 210 through the rear hole 250 can reach the screw 110 by passing through the guide hole 1125 of the screw housing 120.

[0120] The moving plate 300 is movably connected to the screw housing 120 and is displaced by the relative movement between the main body 100 and the guide member 200. When the screw 110 rotates, the main body 100 moves relative to the guide member 200 in a forward or backward direction, and the moving plate 300 can be displaced by the guide member 200. Here, the displacement of the moving plate 300 may mean that a part or all of the moving plate 300 moves upward or downward.

[0121] The moving plate 300 can form the lordosis angle and height of the intervertebral body fusion protector 1. In one embodiment of the present invention, the moving plate 300 forms the upper surface of the intervertebral body fusion protector 1. The moving plate 300 may include a plate body 310, an anterior guided portion 320, a posterior guided portion 330, and a second connecting portion 340.

[0122] The plate body 310 has an overall rectangular shape and is penetrated vertically. The plate body 310 has side walls that extend downwards in all four directions from the penetration point.

[0123] At this time, one or more resistance protrusions 317 may be formed on the upper surface of the plate body 310, protruding from the upper side of the moving plate 300.

[0124] Although the resistance projection 317 protrudes upward on the upper surface of the plate body 310, it can be extended in a third direction perpendicular to the first direction, i.e., in the left-right direction as viewed in Figures 1 to 6.

[0125] Accordingly, although the resistance protrusions 317 are generally formed in a chisel-like shape extending in the left-right direction, multiple protrusions may be formed in a row along the front-to-back direction on the upper surface of the plate body 310.

[0126] The front guided portion 320 is guided by the front guide portion 220 of the guide member 200. When the moving plate 300 moves relative to the guide member 200 and the front guided portion 320 is guided by the front guide portion 220, the front portion of the moving plate 300 can rise. In one embodiment of the present invention, the front guided portion 320 is formed as a recess on the inner surface of both side walls of the plate body 310, but is formed as a recess that is inclined downward from rear to front.

[0127] The rear guided portion 330 is guided by the rear guide portion 230 of the guide member 200. When the moving plate 300 moves relative to the guide member 200 and the rear guided portion 330 is guided by the rear guide portion 230, the rear portion of the moving plate 300 can rise. In one embodiment of the present invention, the rear guided portion 330 is provided on the rear side wall of the plate body 310 and is formed to incline downward from the rear to the front.

[0128] The second connecting portion 340 is connected to the first connecting portion 126 so as to be movable in the vertical direction. The second connecting portion 340 connects the moving plate 300 to the screw housing 120 of the main body 100. In one embodiment of the present invention, the second connecting portion 340 may be connected to the first connecting portion 126 of the screw housing 120 so as to be movable in the vertical direction. In one embodiment of the present invention, the second connecting portion 340 may include portions that protrude from the inner surfaces of both side walls of the plate body 310 but extend in the vertical direction.

[0129] The operation of the intervertebral body fusion support material 1 according to one embodiment of the present invention will be described in detail below.

[0130] Figure 8 is a rear perspective view of an intervertebral body fusion support material according to one embodiment of the present invention in a state where the lordosis angle is expanded. Figure 9 is a left side view of the intervertebral body fusion support material shown in Figure 8. Figure 10 is a side cross-sectional view showing the process by which the angles of the anterior guide portion and the anteriorly guided portion of the intervertebral body fusion support material according to one embodiment of the present invention become aligned.

[0131] Referring to Figures 8 to 10, when the screw 110 of the main body 100 rotates in one direction while the moving plate 300 is not extended relative to the guide member 200, the moving plate 300 is displaced as the guide member 200 moves forward relative to the main body 100. At this time, the front portion of the moving plate 300 moves preferentially in the vertical direction, increasing the angle between the moving plate 300 and the guide member 200. In connection with this, the rotation of the screw 110 may occur when a torque greater than or equal to the limit torque is applied to the screw.

[0132] As shown in Figure 10, the angle expansion of the front portion of the moving plate 300 continues until the angle (α) that the front guided portion 320 of the moving plate 300 makes with respect to the ground and the angle (β) that the front guide portion 220 of the guide member 200 makes with respect to the ground become the same. In the non-expanded state of the moving plate 300, the angle (β) that the front guide portion 220 makes with respect to the ground is smaller than the angle (α) that the front guided portion 320 of the moving plate 300 makes with respect to the ground.

[0133] Consequently, when the moving plate 300 is displaced, the anterior portion of the moving plate 300 rises until the angle that the anterior guide portion 220 and the anterior guided portion 320 make with respect to the ground becomes the same, which can cause an expansion of the lordosis angle. In other words, the angle (β) that the anterior guide portion 220 makes with respect to the ground can correspond to the lordosis angle of the spine that the intervertebral body fusion support material 1 can provide. On the other hand, as the anterior portion of the moving plate 300 rises, the moving plate 300 moves backward relative to the guide member 200, and the posterior guided portion 330 of the moving plate 300 comes into contact with the posterior guide portion 230 of the guide member 200.

[0134] In this way, during the initial stages of displacement of the moving plate 300, the anterior portion of the moving plate 300 rises until the angle that the anterior guide portion 220 and the anterior guided portion 320 make with respect to the ground becomes the same. As a result, expansion of the lordosis angle may occur. Through this process, the intervertebral body fusion protector 1 can create a predetermined lordosis angle in the patient's intervertebral space while inserted into it.

[0135] Figure 11 is a perspective view of an intervertebral body fusion support material according to one embodiment of the present invention, showing an increased height after expansion of the lordosis angle of the plate. Figure 12 is a left side view of the intervertebral body fusion support material shown in Figure 11.

[0136] Referring to Figures 11 and 12, when the front portion of the moving plate 300 rises to its maximum, the angle between the front guided portion 320 of the moving plate 300 and the ground becomes the same as the angle between the front guide portion 220 of the guide member 200 and the ground, and the rear guided portion 330 of the moving plate 300 and the rear guide portion 230 of the guide member 200 come into contact, and the screw 110 of the main body 100 rotates additionally in one direction, the entire moving plate 300 moves vertically and its height increases.

[0137] In other words, after the angle has increased by the set angle, when the screw 110 is rotated further, the front guided portion 320 and rear guided portion 330 of the moving plate 300 come into contact with the front guide portion 220 and rear guide portion 230 of the guide member 200, respectively. As the guide member 200 moves forward relative to the main body 100, the moving plate 300 moves vertically upward as a whole, and consequently, the height of the intervertebral body fusion protector 1 is expanded. At this time, the expanded height can be set to correspond to the height of the space between the intervertebral bodies that the intervertebral body fusion protector 1 aims to secure.

[0138] In this regard, the rotation of the screw 110 may occur when a torque greater than or equal to the limit torque is applied to the screw.

[0139] The displacement of the intervertebral body fusion support material 1 according to one embodiment of the present invention is reversible. In other words, if a torque exceeding the limit torque is applied to the screw 110 in the opposite direction while the intervertebral body fusion support material 1 is expanded, the displacement of the guide member 200 and the moving plate 300 described above may proceed in the reverse direction.

[0140] On the other hand, in relation to the relative motion between the main body 100 and the guide member 200, the guide member 200 may further comprise lateral guide portions 260 formed in the front-rear direction on the side walls of both sides of the guide body 210. Furthermore, although the detachment prevention member 140 is positioned to penetrate both sides of the screw housing 120, one end and the other end may be attached to the lateral guide portions 260, respectively.

[0141] In one embodiment of the present invention, the lateral guide portion 260 may be provided at the upper end corners of the side walls on both sides of the guide body 210. In addition, one end and the other end of the pin-type detachment prevention member 140 protrude from both sides of the screw housing 120 so that the main body 100 can be guided by the lateral guide portion 260 when moving relative to the guide member 200.

[0142] Figure 13 is a diagram showing the process by which an intervertebral body fusion support material according to one embodiment of the present invention is used in PLIF. Figure 14 is a diagram showing the process by which an intervertebral body fusion support material according to one embodiment of the present invention is used in TLIF.

[0143] Referring to Figures 13 and 14, the intervertebral body fusion material 1 according to one embodiment of the present invention can be used for both PLIF (Posterior Lumbar Interbody Fusion) and TLIF (Transforaminal Lumbar Interbody Fusion). The intervertebral body fusion material 1 is inserted into the space between the upper vertebral body A1 and the lower vertebral body A2 to fully expand the lordosis angle and height. Furthermore, by expanding after insertion into the patient's body, it enables minimally invasive treatment during insertion.

[0144] Although one embodiment of the present invention has been described above, the concept of the present invention is not limited to the embodiment presented herein. Those skilled in the art who understand the concept of the present invention can easily propose other embodiments by adding, changing, deleting, or adding components, and these too can be said to fall within the scope of the present invention.

Claims

1. A screw comprising a screw head and a screw body extending from the screw head in a first direction and having threads on its outer surface; A body comprising a screw housing that rotatably houses the screw head and has a through-hole that penetrates along a second direction inclined to the first direction, and a base plate disposed on one side of the screw housing on the second direction side and having a base hole that communicates with the through-hole; A guide member comprising a guide body that houses the screw housing and to which the screw body is rotatably coupled, and which is capable of relative movement with respect to the body in a direction parallel to the first direction in response to the rotation of the screw; A moving plate movably connected to the main body and displaced by the relative movement between the main body and the guide member; and An intervertebral body fusion support material comprising one or more bar-shaped members arranged across the aforementioned penetration;

2. The intervertebral body fusion support material according to claim 1, wherein the bar-shaped member is arranged at the end of the through-hole on the second direction side.

3. The intervertebral body fusion support material according to claim 3, wherein the bar-shaped member is arranged across the through portion along the first direction.

4. The intervertebral body fusion support material according to claim 1, wherein a plurality of the bar-shaped members are arranged parallel to each other.

5. The intervertebral body fusion support material according to claim 1, wherein a plurality of bar-shaped members are arranged at positions having different heights and spaced apart from each other.

6. The intervertebral body fusion support material according to claim 1, wherein the bar-shaped members are provided in multiple quantities, but at least two or more of the bar-shaped members are arranged in positions where at least a portion of them overlap when viewed in the second direction.

7. The base plate includes one or more resistance protrusions formed on one surface facing the second direction, The intervertebral body fusion support material according to claim 1, wherein the resistance projection extends in a third direction perpendicular to the first direction.

8. Although the aforementioned resistance protrusions are formed in multiple locations, At least one of the resistance protrusions is formed on one surface of the base plate on the second direction side in a portion where the base hole is not located. The intervertebral body fusion support material according to claim 7, wherein at least one of the resistance protrusions is formed on one surface of the base plate on the second direction side such that its end portion crosses the base hole along the third direction.

9. The intervertebral body fusion support material according to claim 3, wherein a porous member made of a porous material is provided inside the base hole.

10. The intervertebral body fusion support material according to claim 9, wherein the porous member is provided in a form corresponding to the shape of the base hole.

11. The second direction is formed at an angle perpendicular to the first direction, The intervertebral body fusion support material according to claim 1, wherein the area of ​​the cross section obtained by cutting the base hole in a direction perpendicular to the second direction is formed to be larger than the area of ​​the cross section obtained by cutting the end of the through portion on the second direction side in a direction perpendicular to the second direction.

12. The moving plate includes one or more upper resistance protrusions formed to project from the surface furthest from the base plate, The intervertebral body fusion support material according to claim 1, wherein the upper resistance projection extends in a third direction perpendicular to the first direction.

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