KR102346366B1 - Intervertebral body fusion device - Google Patents

Abstract

An intervertebral body fusion prosthesis, according to one embodiment of the present invention, comprises: an upper plate including a first guided part, and having a structure that is expandable in a horizontal direction; a lower plate including a second guided part, having a structure that is expandable in the horizontal structure, and disposed on a lower part of the upper plate; a first screw member disposed between the upper plate and the lower plate; a second screw member which moves forward with respect to the first screw member when rotating in one direction while engaged with the first screw member between the upper plate and the lower plate; and a movable member to which the second screw member is rotatably coupled, which moves together with the second screw member when the second screw member moves forward, and which includes a first guide part for guiding the first guided part so that the upper plate expands horizontally while moving upward and a second guide part for guiding the second guided part so that the lower plate expands horizontally while moving downward. According to the present invention, a patient's incision site can be minimized.

Description

Intervertebral body fusion prosthesis {INTERVERTEBRAL BODY FUSION DEVICE}

The present invention relates to an intervertebral body fusion prosthesis, and more particularly, to an intervertebral body fusion prosthesis inserted and fixed between vertebral bodies in order to secure a gap between the vertebral bodies.

The intervertebral body fusion prosthesis is a device used in fusion, which is a surgical treatment method for spinal diseases. When a disc is ruptured or weakened due to a disease or accident, pain occurs by compressing the spinal nerve. Intervertebral fusion is performed by inserting an intervertebral fusion prosthesis.

As described above, the intervertebral body fusion prosthesis is inserted into the intervertebral body between the vertebrae from which the degenerative discs have been removed to secure a space for the bones to grow and enter for fusion. In addition, the intervertebral body fusion prosthesis relieves pain by securing a gap between the vertebral bodies, and restores the stability of the spine.

Conventionally, PEEK/Titanium intervertebral body fusion prosthesis has been widely used. In general, in the case of PEEK/Titanium intervertebral body fusion implants, each product has a fixed size and height. Therefore, it is virtually impossible to properly secure the gap between the vertebrae, which differs from patient to patient. In addition, it was not easy to insert the intervertebral body fusion prosthesis when the disc space between the vertebrae of the patient was narrow.

In order to solve this problem, intervertebral body fusion prosthesis that can be extended and adjusted after insertion has been introduced, but most of the existing products have a form in which only one element of height, angle, and area can be adjusted. However, the height of the intervertebral fusion prosthesis is sufficient but the support area is insufficient, which causes subsidence of the vertebral body. also do

On the other hand, it may be considered to use a bulky intervertebral fusion prosthesis to satisfy both height and area, but as the size of the intervertebral fusion prosthesis increases, the patient's incision for insertion also increases, which puts a burden on the patient.

In such a situation, there is a need to develop an intervertebral fusion prosthesis that can simultaneously control the support area and height while minimizing the patient's incision area.

Republic of Korea Patent 10-1371418 "Intervertebral body fusion prosthesis"

SUMMARY OF THE INVENTION The present invention is to solve the problems of the prior art, and an object of the present invention is to provide an intervertebral fusion prosthesis capable of simultaneously adjusting the height and the support area while minimizing the incision site of the patient.

an upper plate having a possible structure; a lower plate having a second part to be guided, having a structure expandable to left and right sides, and disposed under the upper plate; a first screw member disposed between the upper plate and the lower plate; a second screw member engaged with the first screw member between the upper plate and the lower plate and moving forward with respect to the first screw member when rotating in one direction; and the second screw member is coupled in a rotatable form to advance together with the second screw member when the second screw member advances, and the first guided part so that the upper plate expands left and right while moving upward. There is provided an intervertebral body fusion prosthesis comprising a first guide part for guiding and a moving member having a second guide part for guiding the second part to be guided so that the lower plate moves in a downward direction and expands left and right.

In this case, the upper plate and the lower plate are divided into a left part and a right part, respectively, and may include a bridge that connects the divided left part and the right part, and is expandable left and right.

In addition, the bridge may have a front-rear left-right symmetric structure.

In addition, the first part to be guided engages with both left and right sides of the first guide part, and the second part to be guided engages with both left and right sides of the second guide part, wherein the first guide part and the second guide part engage from the front. It may include a section in which the left and right widths are extended toward the rear.

In addition, the upper plate includes a third part to be guided, the lower plate includes a fourth part to be guided, and in the intervertebral body fusion prosthesis, the first screw member is fixedly coupled, and when the moving member moves forward, the A third guide part for guiding the third part to be guided so that the upper plate expands left and right while moving upward, and a fourth guide part for guiding the fourth part to be guided so that the lower plate expands left and right while moving downward. It may further include a fixing member provided.

In addition, the third part to be guided engages with both left and right sides of the third guide part, and the fourth part to be guided engages with both left and right sides of the fourth guide part, wherein the third guide part and the fourth guide part engage from the front. It may include a section in which the left and right widths are reduced toward the rear.

In addition, the first part to be guided is provided at the rear of the upper plate, the second part to be guided is provided at the rear of the lower plate, the third part to be guided is provided at the front of the upper plate, and the fourth The part to be guided may be provided in front of the lower plate.

In addition, the upper plate may further include an upper keel protruding upward along the left-right direction on the upper surface, and the lower plate may further include a lower keel protruding downward along the left-right direction on the lower surface.

In addition, the intervertebral body fusion prosthesis includes a support member disposed between the upper plate and the lower plate while surrounding the second screw member so that the upper plate and the lower plate move only in the vertical direction when the moving member is advanced. may include more.

In addition, the support member is formed in a ring shape, and may be inserted and seated in grooves respectively formed on the lower surface of the upper plate and the upper surface of the lower plate.

In addition, the movable member may have a coupling portion on both sides to which an inserter for insertion of the intervertebral body fusion prosthesis member is coupled.

According to an embodiment of the present invention, the height and the support area of the intervertebral body fusion prosthesis inserted into the intervertebral body through the upper plate and lower plate that move upward or downward according to the movement of the moving member and extend left and right are continuously maintained. Because it can be adjusted to a specific scale, customized fusion is possible and the burden on the patient and the doctor during the operation is reduced.

1 is a front perspective view of an intervertebral body fusion prosthesis according to an embodiment of the present invention.
2 is a rear perspective view of an intervertebral body fusion prosthesis according to an embodiment of the present invention.
3 is an exploded perspective view of an intervertebral body fusion prosthesis according to an embodiment of the present invention.
4 is a perspective view of an increased height and support area of the intervertebral body fusion prosthesis according to an embodiment of the present invention.
5 is a view showing the process of increasing the height and support area of the intervertebral body fusion prosthesis according to an embodiment of the present invention in a horizontal cross-section of the upper part.
6 is a view showing the process of increasing the height and support area of the intervertebral body fusion prosthesis according to an embodiment of the present invention from one side.
7 is a view showing a process of increasing the height and support area of the intervertebral body fusion prosthesis according to an embodiment of the present invention from the front.
8 is a view showing the insertion state of the intervertebral body fusion prosthesis according to an embodiment of the present invention.

Hereinafter, with reference to the accompanying drawings, the embodiments of the present invention will be described in detail so that those of ordinary skill in the art to which the present invention pertains can easily implement them. The present invention may be embodied in many different forms and is not limited to the embodiments described herein. In order to clearly explain the present invention, parts irrelevant to the description in the drawings are omitted, and the same reference numerals are given to the same or similar components throughout the specification.

In this specification, terms such as "comprises" or "have" are intended to describe the existence of features, numbers, steps, operations, components, parts, or combinations thereof described in the specification, but one or more other features It should be understood that this does not preclude the possibility of the presence or addition of numbers, steps, operations, components, parts, or combinations thereof.

In this specification, spatially relative terms "front", "rear", "upper" or "lower" may be used to describe the correlation with the components shown in the drawings. These are relative terms determined based on what is shown in the drawings, and the positional relationship may be conversely interpreted according to the orientation. In addition, that a component is "connected" with another component includes not only direct connection to each other, but also indirect connection to each other, unless otherwise specified.

1 is a front perspective view of an intervertebral body fusion prosthesis according to an embodiment of the present invention. 2 is a rear perspective view of an intervertebral body fusion prosthesis according to an embodiment of the present invention. 3 is an exploded perspective view of an intervertebral body fusion prosthesis according to an embodiment of the present invention. In addition, Figure 4 is a perspective view of the increased height and support area of the intervertebral body fusion prosthesis according to an embodiment of the present invention.

The intervertebral body fusion prosthesis 1 according to an embodiment of the present invention is a device used for fusion, which is a surgical treatment method for spinal diseases. The intervertebral body fusion prosthesis 1 according to an embodiment of the present invention is inserted into the intervertebral body between the vertebrae to secure a space for growth of bones for fusion.

1 to 4, the intervertebral body fusion prosthesis 1 according to an embodiment of the present invention includes an upper plate 10, a lower plate 20, a first screw member 30, and a second screw member. 40 , a moving member 50 , a fixing member 60 and a support member 70 .

The upper plate 10 has a structure expandable to both left and right sides. The upper plate 10 supports the vertebral body located on the upper side in a state in which the intervertebral body fusion prosthesis 1 according to an embodiment of the present invention is inserted into the intervertebral body.

The upper plate 10 may be extended left and right while moving upward as the moving member 50 advances. Accordingly, the height and support area of the intervertebral body fusion prosthesis 1 are increased.

In one embodiment of the present invention, the upper plate 10 is divided into an upper left side 11 and an upper right side 12 , and the upper left side 11 and the upper right side 12 are the upper bridge 13 . ) is connected by The upper plate 10 may be symmetrical with respect to the upper bridge 13 .

The front surfaces of the upper left side 11 and the upper right side 12 are inclined downward from the front to the rear, and the rear surfaces of the upper left side 11 and the upper right side 12 are downwardly from the rear to the front. It may be formed to be inclined.

The upper bridge 13 connects the upper left side 11 and the upper right side 12 , and is formed to be expandable left and right. The upper bridge 13 has elasticity and may provide a force in a direction in which it is contracted left and right.

In one embodiment of the present invention, the upper bridge 13 may have a front-rear left-right symmetric structure. In addition, the upper bridge 13 may form a through hole penetrated in the vertical direction.

In an embodiment of the present invention, the upper plate 10 includes a first part to be guided 14 and a third part to be guided 15 . The first part to be guided 14 and the third part to be guided 15 allow the upper plate 10 to move upward and to expand left and right.

The first guided portion 14 is guided by the first guide portion 52 of the movable member 50 when the movable member 50 moves forward, and induces upward movement and left and right expansion of the upper plate 10 . .

The first part to be guided 14 may be provided at the rear of the upper plate 10 . In more detail, the first to-be-guided part 14 is recessed from right to left along the front-rear direction at the rear of the upper left side 11, and a first guide groove 14a formed to be inclined downward from the rear to the front, It may be formed of a second guide groove (14b) recessed from left to right along the front-rear direction at the rear of the upper right side (12) and inclined downwardly from the rear to the front.

In one embodiment of the present invention, the left and right width of the first part to be guided 14 may be formed to be narrower in the front than the rear. In other words, the distance between the first guide groove 14a and the second guide groove 14b may be formed closer in the front portion than in the rear portion.

The third guided portion 15 is guided by the third guide portion 62 of the fixed member 60 when the moving member 50 is advanced, and induces upward movement and left and right expansion of the upper plate 10 . .

The third part to be guided 15 may be provided in front of the upper plate 10 . In more detail, the third guided portion 15 is recessed from right to left along the front-rear direction in front of the upper left side 11 and a third guide groove 15a formed to be inclined downward from the front to the rear, It may be formed of a fourth guide groove (15b) recessed from left to right along the front-rear direction in front of the upper right side (12) and inclined downwardly from the front to the rear.

In one embodiment of the present invention, the left and right width of the third part to be guided 15 may be formed to be wider in the front than the rear. In other words, the distance between the third guide groove 15a and the fourth guide groove 15b may be formed closer to the rear than the front.

The top plate 10 may include an upper keel 16 . The upper kiel 16 is formed to protrude upward along the left-right direction on the upper surface of the upper plate 10 . When the intervertebral body fusion prosthesis 1 is inserted into the intervertebral body, the upper keel 16 is embedded in an end plate positioned above the intervertebral body, and provides a fixing force to the upper plate 10 .

The upper keel 16 may be formed over the upper left side 11 , the upper right side 12 and the upper bridge 13 . In an embodiment of the present invention, a plurality of upper keels 16 are formed side by side along the front-rear direction on the upper surface of the upper plate 10 .

The lower plate 20 has a structure expandable to both left and right sides. The lower plate 20 supports the vertebral body located on the lower side in a state in which the intervertebral body fusion prosthesis 1 according to an embodiment of the present invention is inserted into the intervertebral body.

The lower plate 20 may be extended left and right while moving downward as the moving member 50 advances. Accordingly, the height and support area of the intervertebral body fusion prosthesis 1 are increased.

In an embodiment of the present invention, the lower plate 20 may be formed in the same manner as the upper plate 10 and may be disposed with an orientation opposite to that of the upper plate 10 .

In one embodiment of the present invention, the lower plate 20 is divided into a lower left side 21 and a lower right side 22 , and the lower left side 21 and the lower right side 22 are the bridge 23 . connected by The lower plate 20 may form left-right symmetry with respect to the lower bridge 23 .

The front surfaces of the lower left side 21 and the lower right side 22 are inclined upward from the front to the rear, and the rear surfaces of the lower left side 21 and the lower right side 22 are upwardly inclined from the rear to the front. It may be formed to be inclined.

The lower bridge 23 connects the lower left side 21 and the lower right side 22 of the lower plate 20, and is formed to be expandable left and right. The lower bridge 23 has elasticity, and may provide a force in a direction in which it is contracted left and right.

In one embodiment of the present invention, the lower bridge 23 may have a front-rear left-right symmetric structure. In addition, the lower bridge 23 may form a through hole penetrated in the vertical direction.

In one embodiment of the present invention, the lower plate 20 includes a second part to be guided 24 and a fourth part to be guided (25). The second to-be-guided part 24 and the fourth to-be-guided part 25 allow the lower plate 20 to move downward and to expand left and right.

The second guided portion 24 is guided by the second guide portion 53 of the movable member 50 when the movable member 50 moves forward, and induces downward movement and left and right expansion of the lower plate 20 . .

The second part to be guided 24 may be provided at the rear of the lower plate 20 . In more detail, the second to-be-guided part 24 is recessed from right to left along the front-rear direction at the rear of the lower left side 21 and a fifth guide groove 24a formed to be inclined upwardly from the rear to the front, It may be formed of a sixth guide groove (24b) recessed from left to right along the front-rear direction at the rear of the lower right side 22 and inclined upwardly from the rear to the front.

In one embodiment of the present invention, the left and right width of the second part to be guided 24 may be formed to be narrower in the front than the rear. In other words, the distance between the fifth guide groove 24a and the sixth guide groove 24b may be formed closer to the front than the rear.

The fourth guided portion 25 is guided by the fourth guide portion 63 of the fixed member 60 when the moving member 50 is advanced, and induces upward movement and left and right expansion of the lower plate 20 . .

The fourth part to be guided 25 may be provided in front of the lower plate 20 . In more detail, the fourth to-be-guided part 25 is recessed from right to left along the front-rear direction in front of the lower left side 21 and a seventh guide groove 25a formed to be inclined upwardly from the front to the rear, In the front of the lower right side 22, the eighth guide groove 25b is formed to be recessed from left to right along the front-rear direction and inclined upward from the front to the rear.

In one embodiment of the present invention, the left and right widths of the fourth part to be guided 25 may be formed wider in the front than the rear. In other words, the distance between the seventh guide groove 25a and the eighth guide groove 25b may be formed closer to the rear than the front.

The lower plate 20 includes a lower keel 26 . The lower keel 26 is formed to protrude downward along the left-right direction on the lower surface of the lower plate 20 . When the intervertebral body fusion prosthesis 1 is inserted into the intervertebral body, the lower keel 26 is embedded in an end plate located below the intervertebral body, and provides a fixing force to the lower plate 20 .

The lower keel 26 may be formed over the lower left side 21 , the lower right side 22 and the lower bridge 23 . In one embodiment of the present invention, a plurality of lower keels 26 are formed side by side along the front-rear direction on the lower surface of the lower plate 20 .

The first screw member 30 is disposed between the upper plate 10 and the lower plate 20 . The first screw member 30 may have a longitudinal direction parallel to the front-rear direction of the intervertebral body fusion prosthesis 1 . In one embodiment of the present invention, the first screw member 30 may be disposed in a fixed state with respect to the second screw member (40).

In one embodiment of the present invention, the first screw member 30 includes a head portion 31 and a body portion (32).

The head portion 31 is formed to have a wider cross-section than the body portion 32 so as to be seated around the through hole 64 of the fixing member 60 to be described later. The body portion 32 may have a cylindrical shape, and may include a first screw thread 321 formed on an outer circumferential surface, and a groove 323 recessed in the radial direction.

A stopper 33 may be coupled to the groove 323 . In one embodiment of the present invention, the stopper 33 may be formed in a ring shape. The stopper 33 limits the movable range of the second screw member 40 by protruding outward in the radial direction of the body portion 32 in a state of being inserted into the groove 323 .

The second screw member 40 is engaged with the first screw member 30 between the upper plate 10 and the lower plate 20 and advances with respect to the first screw member 30 when rotating in one direction. The second screw member 40 is coupled to the movable member 50 in a rotatable form, and as the second screw member 40 advances, the movable member 50 advances together.

In one embodiment of the present invention, the second screw member 40 may be formed through the front and rear. The second screw member 40 includes a pipe-shaped body 41 having a second screw thread 411 meshed with the first screw thread 321 of the first screw member 30 formed on the inner circumferential surface, and the body portion 41 . A coupling rib 42 protruding radially outwardly at the rear of the moving member 50 and inserted into a groove formed on the inner circumferential surface of the through hole 55 of the moving member 50, and a body portion 41 at the rear of the coupling rib 42 It is formed with a wider cross-sectional area to press the moving member 50 forward and prevent the moving member 50 from being separated, while the tail part 43 formed so that a surgical tool for rotating the second screw member 40 is inserted and seated. ) may be included.

Meanwhile, in one embodiment of the present invention, one or more windows 412 may be formed in the body portion 41 of the second screw member 40 . When the intervertebral body fusion prosthesis 1 according to an embodiment of the present invention is inserted into the human body, the bone graft material may be injected through the rear of the second screw member 40 , and the injected bone graft material is fed through the window 412 . It can flow out and settle in the intervertebral space.

The moving member 50 moves forward together with the second screw member 40 when the second screw member 40 is coupled in a rotatable form to advance the second screw member 40 . In one embodiment of the present invention, the moving member 50 includes a body portion 51 , a first guide portion 52 , a second guide portion 53 , a through hole 54 and an inserter coupling portion 55 . include

The body portion 51 of the moving member 50 is formed to press the upper plate 10 and the lower plate 20 when the second screw member 40 is advanced. Specifically, the body portion 51 of the moving member 50 is inclined downward from the rear to the front so that the upper portion corresponds to the rear of the upper left side 11 and the upper right side 12, and the lower portion is the lower left side ( 21) and the lower right side 22 is formed to be inclined upwardly from the rear to the front to correspond to the rear.

The first guide part 52 is provided on the upper part of the body part 51 . The first guide part 52 guides the first to-be-guided part 14 of the upper plate 10 when the body part 51 advances and presses the upper plate 10, and the upper plate 10 It allows you to expand left and right while moving upwards.

The second guide part 53 is provided under the body part 51 . The second guide part 53 guides the third to-be-guided part 24 of the lower plate 20 when the body part 51 advances and presses the lower plate 20, and the lower plate 20 It allows you to expand left and right while moving downwards.

The first guide portion 52 and the second guide portion 53 have a portion extending from the front to the rear in left and right widths. The first guided portion 14 is engaged with both left and right sides of the first guide portion 52 , and the second guided portion 24 is engaged with both left and right sides of the second guide portion 53 . However, as described above, the left and right widths of the first part to be guided 14 and the second part to be guided 24 are formed to be narrower in the front than in the rear. Accordingly, as the moving member 50 advances, the first guide part 52 and the second guide part 53 are positioned in front of the first part to be guided 14 and the second part to be guided 24, respectively. When the upper plate 10 and the lower plate 20 is pressed to the left and right both sides are expanded left and right.

The through hole 54 of the moving member 50 is formed to penetrate the body 51 of the moving member 50 in the front-rear direction. The second screw member 40 is disposed through the through hole 54 . As described above, the coupling rib 42 of the second screw member 40 may be inserted into a groove (not shown) formed on the inner circumferential surface of the through hole 54 .

The inserter coupling part 55 is a part to which an inserter (not shown) for insertion into the human body of the intervertebral body fusion prosthesis 1 according to an embodiment of the present invention is coupled. In one embodiment of the present invention, the inserter coupling portion 55 is formed with recesses on the left and right sides of the body 51 of the moving member 50 .

The fixing member 60 allows the first screw member 30 to be fixedly coupled, and to expand left and right while the upper plate 10 moves upward when the moving member 50 advances. In one embodiment of the present invention, the fixing member 60 includes a body portion 61 , a third guide portion 62 , a fourth guide portion 63 , and a through hole 64 .

The body portion 61 of the fixing member 60 supports the upper plate 10 that moves upward and the lower plate 20 that moves downward as the moving member 50 advances, and of the upper plate 10 , It induces upward movement, left and right expansion, and downward movement and left and right expansion of the lower plate 20 .

The body portion 61 of the fixing member 60 is inclined downward from the front to the rear so that the upper portion corresponds to the front of the upper left side 11 and the upper right side 12, and the lower portion is the lower left side 21 And it is formed to be inclined upwardly from front to rear so as to correspond to the front of the lower right side 22 .

The third guide portion 62 of the fixing member 60 is provided on the upper portion of the body portion 61 of the fixing member 60 . The third guide part 62 guides the third guided part 15 of the upper plate 10 when the upper plate 10 is pressed by the moving member 50, and the upper plate 10 moves upward. It allows you to expand left and right while moving in the direction.

The fourth guide portion 63 of the fixing member 60 is provided under the body portion 61 of the fixing member 60 . The fourth guide part 63 guides the fourth guided part 25 of the lower plate 20 when the lower plate 20 is pressed by the moving member 50, and the lower plate 20 moves downward. It allows you to expand left and right while moving in the direction.

The third guide part 62 and the fourth guide part 63 have portions whose left and right widths extend from the rear to the front. The third guided part 15 is engaged with both left and right sides of the third guide part 62 , and the fourth guided part 25 is engaged with both left and right sides of the fourth guide part 63 . However, as described above, the left and right widths of the third part to be guided 15 and the fourth part to be guided 25 are formed wider in the front than in the rear. Accordingly, as a result of the movement of the upper plate 10 and the lower plate 20 by the moving member 50, the third guide part 62 and the fourth guide part 63 are the third guided part 15 and the third guide part 63, respectively. 4 When positioned at the rear of the guided portion 25, the upper plate 10 and the lower plate 20 are pressed left and right to expand.

The support member 70 suppresses the forward and backward movement of the upper plate 10 and the lower plate 20 when the moving member 50 moves forward. The support member 70 surrounds the second screw member 40 and may be disposed between the upper plate 10 and the lower plate 20 .

In one embodiment of the present invention, the support member 70 is formed in a ring shape. In addition, it can be inserted and seated in the groove 17 formed on the lower surface of the upper plate 10 and the groove 27 formed in the upper surface of the lower plate 20 .

5 is a view showing a process of increasing the height and support area of the intervertebral body fusion prosthesis according to an embodiment of the present invention in a horizontal cross section of the upper part, and FIG. 6 is an intervertebral body fusion prosthesis according to an embodiment of the present invention. It is a view showing the process of increasing the height and support area of ash from one side. In addition, FIG. 7 is a view showing the process of increasing the height and support area of the intervertebral body fusion prosthesis according to an embodiment of the present invention from the front.

A process of adjusting the height and support area of the intervertebral body fusion prosthesis 1 according to an embodiment of the present invention will be described with reference to FIGS. 5 to 7 .

When the second screw member 40 is rotated in one direction after the intervertebral body fusion prosthesis (1) is inserted into the intervertebral space from which the disk of the patient's spine has been removed, the moving member ( 50) advances. As the moving member 50 advances, the upper plate 10 and the lower plate 20 move upward and downward respectively by the upper guide 52 and the lower guide 53 of the moving member 50, and left and right is expanded to

At this time, the fixing member 60 moves upward and further induces upward movement and left and right expansion of the upper plate 10 in front of the upper plate 10 that is expanded left and right, and moves downward and expands left and right. The downward movement and left and right expansion of the lower plate 20 are further induced in front of the lower plate 20 to be used.

As such, when the upper plate 10 and the lower plate 20 move upward or downward while the moving member 50 advances from the rear and expand to the left and right, the fixing member 60 moves the upper plate 10 And by additionally inducing movement and left and right expansion in the upward or downward direction while supporting the lower plate 20, the vertical movement and left and right expansion of the upper plate 10 and the lower plate 20 are uniformly and symmetrically in the front and rear. can be done

On the other hand, when the second screw member 40 is rotated in the other direction, the moving member 50 moves backward according to the rotation of the second screw member 40 . As the moving member 50 moves backward, the upper plate 10 and the lower plate 20 move downward and upward respectively by the upper guide 52 and the lower guide 53 of the moving member 50, and left and right can be contracted to

8 is a view showing a human body insertion state of the intervertebral body fusion prosthesis according to an embodiment of the present invention.

Referring to FIG. 8 , the intervertebral body fusion prosthesis 1 according to an embodiment of the present invention may be inserted into the space between the vertebrae S from the rear of the human body. For example, the intervertebral body fusion prosthesis 1 according to an embodiment of the present invention may be used for TLIF (Transforaminal Lumbar Interbody Fusion) surgery.

According to an embodiment of the present invention, the vertical spacing and support area of the intervertebral body fusion prosthesis 1 can be adjusted on a continuous scale. Through this, securing a bone fusion space for the fusion of the vertebral bodies and supporting the vertebral bodies are facilitated, and a patient-specific fusion can be performed suitable for the spacing between the vertebral bodies of the patient.

Although one embodiment of the present invention has been described, the spirit of the present invention is not limited by the embodiments presented herein, and those skilled in the art who understand the spirit of the present invention can add components, within the scope of the same spirit, Other embodiments may be easily proposed by changes, deletions, additions, etc., but these will also fall within the scope of the present invention.

10: upper plate 20: lower plate
30: first screw member 40: second screw member
50: moving member 60: fixed member
70: support member

Claims (11)

an upper plate having a first guided portion and having a structure expandable to both left and right sides;
a lower plate having a second part to be guided, having a structure expandable to left and right sides, and disposed under the upper plate;
a first screw member disposed between the upper plate and the lower plate;
a second screw member engaged with the first screw member between the upper plate and the lower plate and moving forward with respect to the first screw member when rotating in one direction; and
The second screw member is coupled in a rotatable form to advance together with the second screw member when the second screw member advances, and guides the first guided portion so that the upper plate expands left and right while moving upward. and a moving member having a first guide part and a second guide part for guiding the second part to be guided so that the lower plate expands left and right while moving downward.
The first screw member includes a groove recessed radially inwardly on the outer circumferential surface, and a ring-shaped stopper is coupled to the groove, and the stopper is inserted into the groove and radially outward from the outer circumferential surface of the first screw member Intervertebral body fusion prosthesis protruding to limit the movable range of the second screw member. The method of claim 1,
The upper plate and the lower plate are divided into a left part and a right part, respectively, and the intervertebral body fusion prosthesis includes a bridge connecting the divided left part and the right part, and extending from side to side. 3. The method of claim 2,
The bridge is an intervertebral body fusion prosthesis having a front-to-rear left-right symmetric structure. The method of claim 1,
The first part to be guided is engaged with both left and right sides of the first guide part, and the second part to be guided is engaged with both left and right sides of the second guide part, and the first guide part and the second guide part are engaged from the front to the rear. An intervertebral body fusion prosthesis including a section in which the left and right widths are gradually expanded. The method of claim 1,
The upper plate includes a third part to be guided, and the lower plate includes a fourth part to be guided,
The first screw member is fixedly coupled, and when the moving member moves forward, the third guide part for guiding the third guided part and the lower plate move downward so that the upper plate moves upward and expands left and right. The intervertebral body fusion prosthesis further comprising a fixing member having a fourth guide part for guiding the fourth to-be-guided part so as to expand left and right while doing so. 6. The method of claim 5,
The third part to be guided engages with both left and right sides of the third guide part, and the fourth part to be guided engages with both left and right sides of the fourth guide part, wherein the third guide part and the fourth guide part engage from the front to the rear. Intervertebral body fusion prosthesis including a section in which the left and right widths are gradually reduced. 6. The method of claim 5,
The first part to be guided is provided in the rear of the upper plate, the second part to be guided is provided in the rear of the lower plate, the third part to be guided is provided in front of the upper plate, and the fourth part to be guided is provided in front of the upper plate. The part is an intervertebral body fusion prosthesis provided in front of the lower plate. The method of claim 1,
The upper plate further comprises an upper keel protruding upward along the left-right direction on the upper surface, and the lower plate further comprises a lower keel protruding downward along the left-right direction on the lower surface. The method of claim 1,
The intervertebral body fusion prosthesis further comprising a support member disposed between the upper plate and the lower plate and surrounding the second screw member so that the upper plate and the lower plate move only in the vertical direction when the moving member is advanced. 10. The method of claim 9,
The support member is formed in a ring shape, and the intervertebral body fusion prosthesis is inserted and seated in the grooves respectively formed on the lower surface of the upper plate and the upper surface of the lower plate. The method of claim 1,
The moving member has an intervertebral body fusion prosthesis having a coupling portion on both sides of which an inserter for insertion of the intervertebral body fusion prosthesis member is coupled.

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