Intervertebral body fusion prosthesis

Abstract

Disclosed is an interbody fusion prosthesis. The interbody fusion prosthesis according to an embodiment of the present application includes a body including an accommodation portion opened upward and downward, an upper guide portion, and a lower guide portion; a moving member disposed in the accommodation portion; a screw threadedly coupled to the body and relatively moving with the moving member integrally with the body in a forward or rearward direction when rotated; an upper plate having a guided portion guided by the upper guide portion and disposed in an upper portion of the body in engagement with the moving member; and a lower plate having a guided portion guided by the lower guide portion and disposed in a lower portion of the body in engagement with the moving member.

Description

TECHNICAL FIELD

[0001] The present application relates to an interbody fusion cage, and more particularly to an interbody fusion cage inserted into a space where an intervertebral disc is removed to secure a space between adjacent vertebral bodies. BACKGROUND

[0002] An interbody fusion cage is a device used for fusion, which is a surgical treatment method for a vertebral disease. When an intervertebral disc is ruptured or weakened due to a disease or an accident, pain is caused by compression of a vertebral nerve, in which case, the damaged intervertebral disc is removed, and an interbody fusion cage that restores and maintains a space between vertebral bodies and lordosis is inserted into the interbody where the damaged portion is removed to perform fusion between the vertebral bodies.

[0003] As such, the interbody fusion cage is inserted into the interbody between the vertebral bodies where the degenerative intervertebral disc is removed to secure a space into which bone growth for fusion enters. Also, the interbody fusion cage secures a space between the vertebral bodies, relieves pain, and restores the stability of the vertebral bodies.

[0004] Conventionally, a polyether ether ketone / titanium (PEEK / Titanium) interbody fusion cage is frequently used. Generally, each product of the polyether ether ketone / titanium interbody fusion cage has a prescribed size and height. Therefore, in fact, it is not possible to properly secure a space between the vertebral bodies that differs according to patients. Also, when the intervertebral disc space between the vertebral bodies of the patient is narrow, it is difficult to insert the interbody fusion cage.

[0005] In order to solve such a problem, an interbody fusion cage having an adjustable height is disclosed, but the existing product has a structure in which a structure for adjusting the height when the height is expanded is concentrated in the inner center or moves in one direction and contracts, causing the inner space to be narrow, and there is a problem in that it is difficult to secure a space in which bone graft material is filled. Also, at present, when the height is expanded after being transplanted into the patient's body in a state in which the bone graft material is filled in the interbody fusion cage, it is not possible to also fill the bone graft material in the expanded space, which is also a problem pointed out.

[0006] On the other hand, generally, when inserted into the interbody, the interbody fusion cage is inserted obliquely in the coronal plane of the body. However, the conventional interbody fusion cage generally has a four-corner structure that is bilaterally symmetrical, and it is difficult to push to the front of the interbody that has a curved shape. The keel formed in the upper and lower portions of the interbody fusion cage cannot be disposed horizontally with respect to the coronal plane, and when the interbody is fused, instability is also caused.

[0007] (Korean Patent No. 10-1371418 "Interbody fusion cage" SUMMARY

[0008] Technical Problem

[0009] The present application has been made to solve the above-described problems of the conventional technology.

[0010] An object of the present application is to provide an interbody fusion cage which is inserted into an intervertebral body to secure a space between adjacent vertebral bodies, can adjust the height thereof in continuous scales, can perform a fusion surgery for a patient, and can reduce a burden on a doctor during a surgery.

[0011] Another object of the present application is to provide an interbody fusion cage which has a structure suitable for being pushed to the front of an intervertebral body, and can secure physical stability when an interbody fusion is performed.

[0012] Still another object of the present application is to provide an interbody fusion cage which can adjust the height, and can effectively secure a space for filling a bone graft material inside.

[0013] The objects of the present application are not limited to the above, and other objects not mentioned can be clearly understood by those skilled in the art from the following description.

[0014] Technical Solution

[0015] According to an embodiment of the present application, there is provided an interbody fusion cage including a body including an accommodation portion which is open upward and downward, an upper guide portion, and a lower guide portion; a moving member disposed inside the accommodation portion; a screw which is threadedly coupled to the body, and relatively moves forward or rearward with respect to the body integrally with the moving member when rotated; an upper plate having a guided portion guided by the upper guide portion, and disposed in an upper portion of the body in engagement with the moving member; and a lower plate having a guided portion guided by the lower guide portion, and disposed in a lower portion of the body in engagement with the moving member.

[0016] At this time, when the screw is rotated in one direction in a state in which the upper plate and the lower plate are fixed between vertebral bodies of a human body, the upper plate can move upward along the upper guide portion and the lower plate can move downward along the lower guide portion as the body moves forward by the screw and the moving member.

[0017] Further, the upper guide portion can be formed in a shape inclined downward from the rear to the front in the upper portion of the body, and the lower guide portion can be formed in a shape inclined upward from the rear to the front in the lower portion of the body.

[0018] Also, the body can further include a screw hole formed in the front, and the screw can include a head rotatably coupled to the moving member and a threaded portion threadedly coupled to the screw hole.

[0019] Also, the moving member can be surrounded by side walls, and can be open upward and downward, and the moving member can include a threaded coupling hole through which the head of the screw is coupled to the front side wall.

[0020] Also, the body can further include a rear hole formed in the rear in communication with the receiving portion, and the moving member can further include a guide hole formed in the rear side wall to allow a screwdriver tool inserted through the rear hole to be coupled to the head.

[0021] Also, the rear hole can be provided as a coupling interface for a surgical tool for inserting the interbody fusion prosthesis into a human body.

[0022] Also, the moving member can include grooves formed in the upper and lower side walls, respectively, and the upper and lower plates can include protrusions inserted into the grooves, respectively.

[0023] Also, the upper and lower guide portions can be formed in the both side surfaces of the body, respectively.

[0024] Also, the upper and lower plates can include front inclined portions formed in the front in such a manner that the front inclined portions protrude more toward the front as they go from one side to the other side.

[0025] Also, the upper and lower plates can be formed to be symmetrical upward and downward.

[0026] Also, the upper and lower plates can include keel portions formed in the upper and lower portions in parallel with the front inclined portions, respectively.

[0027] Also, the upper and lower plates can include windows penetrating in the upward and downward directions, respectively.

[0028] Also, the body can be surrounded by side walls, and can be open upward and downward.

[0029] Effects of the Invention

[0030] According to an embodiment of the present invention, the height of the interbody fusion prosthesis inserted into the interbody can be adjusted with a continuous scale, and a fusion surgery for a patient can be performed, and the burden on a doctor can be reduced during the surgery.

[0031] Also, by having the interbody fusion prosthesis having a structure suitable for being pushed to the front of the interbody, physical stability can be ensured when the interbody is fused.

[0032] Also, after adjusting the height of the interbody fusion cage, a space for filling the bone graft material can be effectively secured inside thereof. BRIEF DESCRIPTION OF DRAWINGS

[0033] Figure 1 A perspective view of an interbody fusion cage according to an embodiment of the present application.

[0034] Figure 2 A perspective view of an interbody fusion cage according to an embodiment of the present application, shown from another angle.

[0035] Figure 3 A plan view of an interbody fusion cage according to an embodiment of the present application.

[0036] Figure 4 An exploded perspective view of an interbody fusion cage according to an embodiment of the present application.

[0037] Figure 5 An exploded perspective view of an interbody fusion cage according to an embodiment of the present application, shown from another angle.

[0038] Figure 6 A diagram showing a height adjustment process of an interbody fusion cage according to an embodiment of the present application, shown from a side.

[0039] Figure 7 A diagram showing a height adjustment process of an interbody fusion cage according to an embodiment of the present application, shown by a longitudinal section.

[0040] Figure 8 A diagram showing a height adjustment process of an interbody fusion cage according to an embodiment of the present application, shown by a plan.

[0041] Figure 9 A diagram showing an interbody insertion state of an interbody fusion cage according to an embodiment of the present application.

[0042] Figure 10 A diagram showing a combined state of an interbody fusion cage and an inserter according to an embodiment of the present application, a bone graft material insertion tube, and a bone graft material pusher.

[0043] Figure 11 A diagram showing a process in which an interbody fusion cage according to an embodiment of the present application is inserted into a human body and a bone graft material is injected.

[0044] Figure 12 A diagram showing a locking screw and a locking screw driver used for a grafting process of an interbody fusion cage according to an embodiment of the present application.

[0045] Figure 13 A diagram showing a process in which an interbody fusion cage according to an embodiment of the present application is inserted into a human body and a bone graft material is injected, and then a locking screw is combined. DETAILED DESCRIPTION

[0046] The present application will be described in detail below with reference to the drawings, which enable a person having ordinary skill in the art to which the present application pertains to easily implement the present application. The present application can be implemented in various different forms, and is not limited to the embodiments described herein. In order to clearly describe the present application, portions unrelated to the description are omitted from the drawings, and the same or similar structural elements are denoted by the same reference numerals throughout the specification.

[0047] In the present specification, the terms "comprising" or "including" or the like are to be understood as specifying the presence of the stated features, numbers, steps, actions, structural elements, components, or combinations thereof, and do not preclude the presence or addition of one or more other features or numbers, steps, actions, structural elements, components, or combinations thereof.

[0048] Figure 1 and Figure 2 FIG. 1A and FIG. 1B respectively show a perspective view of an interbody fusion cage according to an embodiment of the present application, and a perspective view of the interbody fusion cage according to an embodiment of the present application viewed from below, Figure 3 FIG. 2 shows a plan view of the interbody fusion cage according to an embodiment of the present application. Also, Figure 4 and Figure 5 FIG. 3A and FIG. 3B respectively show an exploded perspective view of the interbody fusion cage according to an embodiment of the present application viewed from the front, and an exploded perspective view of the interbody fusion cage according to an embodiment of the present application viewed from the rear.

[0049] With reference to Figures 1 to 5 , the interbody fusion cage 1 according to an embodiment of the present application includes a body 11, a moving member 12, a screw 13, an upper plate 14, and a lower plate 15.

[0050] The body 11 is a portion in which the moving member 12, the screw 13, the upper plate 14, and the lower plate 15 are disposed. The body 11 is surrounded by side walls on all sides, and has a frame shape that is open at the top and bottom.

[0051] In an embodiment of the present application, the body 11 includes a screw hole 111, a receiving portion 112, an upper guide portion 113, a lower guide portion 114, a rear hole 115, and an inserter coupling portion 116.

[0052] The screw hole 111 is formed in the front of the body 11. The screw hole 111 is a portion that is coupled to the threaded portion 132 of the screw 13, and is formed complementarily to the threaded portion 132 of the screw 13. In an embodiment of the present application, the screw hole 111 is formed through the front side wall of the body 11.

[0053] The accommodation portion 112 is formed in the rear of the screw hole 111 and communicates with the screw hole 111. The accommodation portion 112 is a space formed in the center of the body 11 and is open upward and downward. The accommodation portion 112 accommodates the moving member 12, the screw 13, and the like. After the interbody fusion prosthesis of one embodiment of the present application is inserted into the space between the vertebrae of a patient from which the intervertebral disc is removed, the space of the accommodation portion 112 can be filled with a bone graft material.

[0054] The upper guide portion 113 and the lower guide portion 114 are portions that communicate with the guided portion 142 of the upper plate 14 and the guided portion 152 of the lower plate 15, respectively. As described in detail later, when the screw 13 is rotated in one direction and the moving member 12 is relatively moved in the rear direction with respect to the body 11, the upper plate 14 is pushed upward by the upper guide portion 113 and the lower plate 15 is pushed downward by the lower guide portion 114.

[0055] In one embodiment of the present application, the upper guide portion 113 is formed in the upper portion of the body 11 so as to be inclined downward from the rear direction to the front direction, and the lower guide portion 114 is formed in the lower portion of the body 11 so as to be inclined upward from the rear direction to the front direction. That is, in one embodiment of the present application, the upper guide portion 113 and the lower guide portion 114 are formed by symmetrical inclined portions.

[0056] In order to smoothly move the upper plate 14 and the lower plate 15 upward and downward, the upper guide portion 113 and the lower guide portion 114 can be formed in plural or on both side surfaces of the body 11. The upper guide portion 113 and the lower guide portion 114 are preferably formed symmetrically left and right. As described in detail in Figure 4 and Figure 5 In one embodiment of the present application, the upper guide portion 113 and the lower guide portion 114 are symmetrically formed on the left and right side walls of the body 11 and are formed in pairs in the front and rear directions.

[0057] The rear hole 115 is formed through the rear side wall of the body 11 so as to communicate with the accommodation portion 112. In one embodiment of the present application, the rear hole 115 is formed through the rear side wall of the body 11. After the interbody fusion prosthesis 1 of one embodiment of the present application is inserted into the surgical site, a screw rotation tool for rotating the screw 13 can be inserted into the accommodation portion 112 through the rear hole 115.

[0058] Further, the rear hole 115 can function as an interface that combines with a surgical instrument for inserting the interbody fusion prosthesis 1 of one embodiment of the present application into the human body. In one embodiment of the present application, a screw thread is formed on the inner peripheral surface of the rear hole 115. In a state in which the end portion of the surgical instrument is threadedly engaged with the rear hole 115, the interbody fusion prosthesis 1 of one embodiment of the present application can be inserted into the space between the vertebrae of a patient.

[0059] The inserter coupling portion 116 is a portion that couples the interbody fusion prosthesis 1 for an embodiment of the present application to the inserter 2 that is inserted into the human body. In an embodiment of the present application, the inserter coupling portion 116 is formed by a recess that is shaped as prescribed in the side walls of the body 11. By inserting the end portion of the inserter 2 that is shaped as a protrusion corresponding to the shape of the recess of the inserter coupling portion 116, the front of the inserter 2 can be coupled to the interbody fusion prosthesis 1.

[0060] The moving member 12 is disposed in the housing portion 112 and moves in the rearward or forward direction relative to the body 11 together with the screw 13 when the screw 13 is rotated. As the moving member 12 moves in the rearward or forward direction relative to the body 11, the upper plate 14 and the lower plate 15 that are engaged with the moving member 12 move up and down.

[0061] In an embodiment of the present application, the moving member 12 is surrounded by the side walls and is shaped as open upward and downward. The moving member 12 is coupled to the screw 13 and moves backward or forward together with the screw 13 as the screw 13 is retracted or advanced.

[0062] In an embodiment of the present application, the moving member 12 includes a threaded coupling hole 121, a groove 122, and a guide hole 123.

[0063] The threaded coupling hole 121 is formed to insert the head portion 131 of the screw 13 in the front side wall of the moving member 12. The threaded coupling hole 121 is shaped so that the head portion 131 of the screw 13 can be coupled in a rotatable manner. The moving member 12 is coupled to the screw 13 through the threaded coupling hole 121, and when the screw 13 is rotated, the screw 13 and the moving member 12 also act as one body.

[0064] The groove 122 is formed in the side walls of the moving member 12 in the upward and downward directions. The moving member 12 is engaged with the upper plate 14 and the lower plate 15 by inserting the protruding portions 141 of the upper plate 14 and the protruding portions 151 of the lower plate 15 into the grooves 122.

[0065] The guide hole 123 is formed through the rear side wall of the moving member 12. The guide hole 123 provides a path through which the screw rotation tool that passes through the rear hole 115 of the body 11 can enter the head portion 131.

[0066] On the other hand, in an embodiment of the present application, the central portion of the moving member 12 is formed by an empty space that is open upward and downward, and after the interbody fusion prosthesis for an embodiment of the present application is inserted into the intervertebral space of a patient from which the intervertebral disc is removed, the space can be filled with bone graft material.

[0067] The screw 13 is threadedly coupled to the body 11 and, when rotated, moves in unison with the moving member 12 relative to the body 11 in the forward or rearward direction. When the screw 13 is rotated in one direction, the screw 13 and the moving member 12 move in unison relative to the body 11 in the rearward direction, and when the screw 13 is rotated in the other direction, the screw 13 and the moving member 12 move in unison relative to the body 11 in the forward direction.

[0068] In an embodiment of the present application, the screw 13 includes a head 131 rotatably coupled to the moving member and a threaded portion 132 threadedly coupled to the screw hole 111.

[0069] The head 131 is coupled to the screw coupling hole 121 of the moving member 12 in a rotatable manner. The head 131 is insert-coupled to the screw coupling hole 121 and is rotated by a screw rotating tool inserted through the guide hole 123 of the moving member 12. As the head 131 is coupled to the screw coupling hole 121, the screw 13 can move in unison with the moving member 12.

[0070] The threaded portion 132 is threadedly coupled to the screw hole 111 of the body 11. In an embodiment of the present application, the threaded portion 132 has a length that can be retracted or advanced within a predetermined range in a state of being coupled to the screw hole 111. As the head 131 is rotated, the threaded portion 132 moves linearly in a state of being engaged with the screw hole 111.

[0071] The upper plate 14 and the lower plate 15 are disposed at the upper and lower portions of the body 11, respectively. When the screw 13 is rotated in one direction in a state in which the upper plate 14 and the lower plate 15 are fixed between the vertebral bodies of a patient, as the body 11 is moved in the forward direction by the screw 13 and the moving member 12, the upper plate 14 is moved upward along the upper guide portion 113 and the lower plate 15 is moved downward along the lower guide portion 114. Thereby, the height of the intervertebral body fusion prosthesis 1 within the intervertebral body of the patient can be changed.

[0072] The upper plate 14 and the lower plate 15 each include a protrusion 141, 151 that is inserted into the groove 122 of the moving member 12 to engage the upper plate 14 and the lower plate 15 with the moving member 12. The protrusions 141, 151 are formed at the inner side surfaces of the upper plate 14 and the lower plate 15, respectively. The upper plate 14 and the lower plate 15 are engaged with the moving member 12 by the protrusions 141, 151.

[0073] Further, the upper plate 14 has a guided portion 142 guided by the upper guide portion 113, and the lower plate 15 has a guided portion 152 guided by the lower guide portion 114. In an embodiment of the present application, the guided portion 142 of the upper plate 14 is formed by a slope portion complementary to the upper guide portion 113, and the guided portion 152 of the lower plate 15 is formed by a slope portion complementary to the lower guide portion 114. Further, the guided portions 142, 152 are formed on the inner side surfaces of the upper plate 14 and the lower plate 15.

[0074] In other words, the upper plate 14 has a guided portion 142 complementary to the upper guide portion 113, and is arranged in engagement with the moving member 12 on the upper portion of the body 11, and the lower plate 15 has a guided portion 152 complementary to the lower guide portion 114, and is arranged in engagement with the moving member 12 on the lower portion of the body 11.

[0075] Figure 6 FIG. 4 is a diagram for showing a height adjustment process of an interbody fusion cage according to an embodiment of the present application from a side view, Figure 7 FIG. 5 is a diagram for showing a height adjustment process of an interbody fusion cage according to an embodiment of the present application from a longitudinal cross section. Further, Figure 8 FIG. 6 is a diagram for showing a height adjustment process of an interbody fusion cage according to an embodiment of the present application from a plan view.

[0076] Referring to Figures 6 to 8 , a height adjustment process of the interbody fusion cage 1 according to an embodiment of the present application will be described. The height adjustment process of the interbody fusion cage 1 described below is premised on a state where the interbody fusion cage 1 is inserted into the intervertebral space of the patient's vertebrae from which the intervertebral disc is removed, and the upper plate 14 and the lower plate 15 are fixed to the vertebral bodies.

[0077] When the screw 13 is rotated in one direction in a state where the interbody fusion cage 1 is inserted into the intervertebral space of the patient's vertebrae from which the intervertebral disc is removed, and the upper plate 14 and the lower plate 15 are fixed to the vertebral bodies, a retreating force acts on the screw 13 and the moving member 12. However, the moving member 12 is in engagement with the upper plate 14 and the lower plate 15, and thus the body 11 advances by reaction. If this is described from another viewpoint, as the screw 13 is rotated in one direction, the screw 13 and the moving member 12 relatively move rearward with respect to the body 11.

[0078] Accordingly, the upper plate 14 in engagement with the moving member 12 moves upward along the upper guide portion 113, and the lower plate 15 moves downward along the lower guide portion 114. As a result, the upper plate 14 moves upward, and the lower plate 15 moves downward, to expand the height of the interbody fusion cage 1.

[0079] In this way, according to an embodiment of the present application, the upper and lower intervals of the interbody fusion prosthesis 1 can be adjusted with continuous scales. Thereby, the bone fusion space for the insertion of the interbody fusion prosthesis 1 and the fusion of the vertebral bodies can be easily ensured, and the fusion surgery for the interval between the vertebral bodies of the patient appropriate to the patient can be achieved.

[0080] Further, according to an embodiment of the present application, after the expansion of the height, the space for filling the bone graft material is effectively ensured inside. At this time, the bone graft material can be injected through the rear hole 115 at the rear of the body 11 and the guide hole 123 of the moving member 12.

[0081] On the other hand, the upper plate 14 and the lower plate 15 each include a front inclined portion 143, 153 formed at the front in a manner that protrudes more toward the front as it goes from one side to the other side. Further, the upper plate 14 and the lower plate 15 are formed to be symmetrical vertically. In this way, by constituting the upper plate 14 and the lower plate 15, the interbody fusion prosthesis 1 of an embodiment of the present application has a structure that is appropriate to be pushed to the frontmost of the interbody when inserted into the interbody.

[0082] Referring to Figure 3 , the front inclined portions 143, 153 form a predetermined angle (θ) with the horizontal plane at the front. Specifically, when the insertion angle of the interbody fusion prosthesis 1 is considered in the case of a transforaminal lumbar interbody fusion (TLIF) surgery, the front inclined portions 143, 153 can form an angle of about 20° to 50° with the horizontal plane at the front, and preferably, an angle of 25° to 35°.

[0083] Figure 9 FIG. 6 shows the state in which the interbody S of the interbody fusion prosthesis 1 of an embodiment of the present application is inserted. Referring to Figure 9 When the surgery, the interbody fusion prosthesis 1 is inserted from the rear to the front of the interbody S of the patient, and a curve is formed at the front of the interbody S. At this time, the front inclined portions 143, 153 formed at the front of the upper plate 14 and the lower plate 15, respectively, allow the interbody fusion prosthesis 1 to almost closely follow the curve at the front of the interbody S. Thereby, the interbody fusion prosthesis 1 can be effectively disposed within the interbody S. Specifically, the front inclined portion 143 can be disposed in parallel with the coronal plane of the patient.

[0084] Further, in an embodiment of the present application, the upper plate 14 and the lower plate 15 each include a groove portion 144, 154 to accommodate the thread portion 132 of the screw 13 exposed to the front through the screw hole 111 in a state in which the upper plate 14 and the lower plate 15 are combined with the body 11, and the groove portion 144 of the upper plate 14 and the groove portion 154 of the lower plate 15 together form the shape of a through hole.

[0085] Further, in an embodiment of the present application, the upper plate 14 includes a keel portion 145 formed on the upper portion in parallel with the front inclined portion 143 of the upper plate 14, and the lower plate 15 includes a keel portion 155 formed on the lower portion in parallel with the front inclined portion 153 of the lower plate 15. Specifically, the keel portions 145, 155 can be formed by concavities and convexities repeatedly appearing in parallel with the front inclined portions 143, 153 in the front and rear directions.

[0086] When the interbody fusion prosthesis 1 is inserted into the interbody, the keel portion 145 of the upper plate 14 is embedded into the end plate located on the upper portion of the interbody, and the keel portion 155 of the lower plate 15 is embedded into the end plate located on the lower portion of the interbody, thereby providing a fixing force to the upper plate 14 and the lower plate 15, respectively.

[0087] As described above, according to an embodiment of the present application, the front inclined portions 143, 153 can be disposed in parallel with the coronal plane of the patient, and thus the keel portions 145, 155 formed in parallel with the front inclined portions 143, 153 can also be disposed in parallel with the coronal plane of the patient, as a result of which, when the interbody fusion prosthesis 1 is fixed, balance can be maintained in the left and right directions to ensure physical stability.

[0088] Further, on the other hand, in an embodiment of the present application, the upper plate 14 and the lower plate 15 each include a window portion 146, 156 penetrating in the upward and downward directions. The window portions 146, 156 are in a form penetrating in the upward and downward directions, and provide a passage through which bone integration between the interbody fusion prosthesis 1 and the vertebral body can be achieved. Bone integration between the interbody fusion prosthesis 1 transplanted through the window portions 146, 156 and the vertebral body can be smoothly achieved.

[0089] Hereinafter, a surgical instrument for transplanting the interbody fusion prosthesis 1 of an embodiment of the present application and a process of transplanting the interbody fusion prosthesis 1 using the same will be described.

[0090] Figure 10 A diagram showing the combined state of the interbody fusion prosthesis and the inserter of an embodiment of the present application, a bone grafting material insertion tube, and a bone grafting material pusher. Further, Figure 11 A diagram showing a process of inserting the interbody fusion prosthesis of an embodiment of the present application into a human body and injecting a bone grafting material.

[0091] Referring to Figure 10 and Figure 11 The inserter 2 is a surgical instrument for inserting the interbody fusion prosthesis 1 into a human body, and has a hollow portion formed penetrating in the length direction. As described above, the front end portion of the inserter 2 can be combined with the inserter combination portion 116 of the interbody fusion prosthesis 1, and the interbody fusion prosthesis 1 can be inserted into the interbody S using the inserter 2.

[0092] When the intervertebral fusion prosthesis 1 is inserted into the intervertebral body S, the bone graft material cannula 3 can be inserted into the hollow portion of the inserter 2 to inject the bone graft material B. The bone graft material B can be allogeneic bone, heterogeneous bone, demineralized bone, synthetic bone, etc.

[0093] At this point, the bone graft pusher 4 can be inserted into the bone graft cannula 3 to push the bone graft material B toward the intervertebral body fusion prosthesis 1. Specifically, the bone graft pusher 4 has a main body portion with an outer diameter smaller than the inner diameter of the bone graft cannula 3. This can be inserted into the bone graft cannula 3 to push the bone graft material B inside the cannula 3 toward the intervertebral body fusion prosthesis 1. In this way, the injected bone graft material B fills the space within the main body 11 and the movable member 12, promoting intervertebral fusion.

[0094] Figure 12 FIG2 is a diagram showing a locking screw and a locking screwdriver used in the implantation process of an intervertebral body fusion prosthesis according to an embodiment of the present invention. Figure 13 The figure shows the process of inserting an intervertebral body fusion prosthesis into a human body, injecting bone graft material, and then fastening the screws according to an embodiment of the present invention.

[0095] Reference Figure 12 and Figure 13 After injecting bone graft material B into the intervertebral body fusion prosthesis 1, locking screw 5 seals the rear of the intervertebral body fusion prosthesis 1. More specifically, locking screw 5 is shaped to seal the rear hole 115 of the intervertebral body fusion prosthesis 1. Locking screw 5, in conjunction with locking screwdriver 6, can be passed through the hollow portion of inserter 2 to access the rear of the intervertebral body fusion prosthesis 1. Locking screw 5 can be tightened to the rear of the intervertebral body fusion prosthesis 1, i.e., rear hole 115, using locking screwdriver 6.

[0096] When the insertion of the intervertebral body fusion prosthesis 1, the injection of the bone graft material B, and the sealing of the rear hole 115 by the locking screw 5 are completed, the inserter 2 is separated from the intervertebral body fusion prosthesis 1. Then, the surgical site can be sutured.

[0097] An embodiment of the present invention is described, but the concept of the present invention is not limited to the embodiment proposed in this specification. Ordinary technicians in the technical field to which the present invention belongs who understand the concept of the present invention can easily propose another embodiment within the scope of the same concept by adding, changing, deleting, adding structural elements, etc., but this also falls within the scope of the concept of the present invention.

Claims

1. An intervertebral body fusion prosthesis, characterized in that: include: The main body includes a receiving portion having upper and lower openings, an upper guide portion, and a lower guide portion; A moving component is disposed inside the housing portion; The screw is threadedly coupled to the body and, when rotated, forms an integral body with the moving component to move forward or backward relative to the body; an upper plate having a guided portion guided by the upper guide portion and being arranged on the upper portion of the main body so as to engage with the moving member; and a lower plate having a guided portion guided by the lower guide portion and being arranged at the lower portion of the body so as to engage with the moving member; The body further comprises a screw hole formed at the front, the screw comprising a head rotatably coupled to the movable member and a threaded portion threadedly coupled to the screw hole; The movable part is surrounded by side walls and has an opening at the top and an opening at the bottom. The movable part includes a threaded hole for connecting the front side wall and the head. The upper guide portion is formed on the upper portion of the body in a downwardly inclined manner from the rear to the front, and the lower guide portion is formed on the lower portion of the body in a upwardly inclined manner from the rear to the front; The moving components each include grooves formed on both side walls in the upward and downward directions, and the upper plate and the lower plate each include a protrusion inserted into the groove.

2. The intervertebral body fusion prosthesis according to claim 1, characterized in that: When the screw rotates in one direction with the upper plate and the lower plate fixed between the vertebrae of the human body, as the main body moves forward using the screw and the moving part, the upper plate moves upward along the upper guide part, and the lower plate moves downward along the lower guide part.

3. The intervertebral body fusion prosthesis according to claim 1, characterized in that: The main body further includes a rear hole formed on the rear side wall and communicating with the receiving portion. The moving component further includes a guide hole formed through the rear side wall, which enables a screw rotating tool passing through the rear hole to enter the head.

4. The intervertebral body fusion prosthesis according to claim 3, characterized in that: The rear hole is provided as a coupling interface for surgical tools used to insert the intervertebral body fusion prosthesis into the human body.

5. The intervertebral body fusion prosthesis according to claim 1, characterized in that: The upper guide portion and the lower guide portion are respectively formed on two side surfaces of the main body.

6. The intervertebral body fusion prosthesis according to claim 1, characterized in that: The upper plate and the lower plate each include a front inclined portion formed in the front so as to protrude further forward as moving from one side toward the other side.

7. The intervertebral body fusion prosthesis according to claim 6, characterized in that: The upper plate and the lower plate are vertically symmetrical.

8. The intervertebral body fusion prosthesis according to claim 7, characterized in that: The upper plate and the lower plate include keel portions formed at upper and lower portions, respectively, in parallel with the front inclined portion.

9. The intervertebral body fusion prosthesis according to claim 1, characterized in that: The upper plate and the lower plate each include a window portion penetrating in the vertical direction.

10. The intervertebral body fusion prosthesis according to claim 9, characterized in that: The main body is surrounded by side walls and is open at the top and bottom.

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