KR101352820B1 - A lumbar expandable cage - Google Patents

Abstract

The present invention relates to an intervertebral expansion cage for expanding a narrowed spacing between vertebral bodies. An intervertebral expansion cage according to an embodiment of the present invention is an intervertebral expansion cage inserted between the vertebral bodies to expand the space between the vertebral bodies, an upper support for supporting the vertebral bodies located above the vertebral bodies, and a lower portion between the vertebral bodies. A cage main body including a lower support part for supporting the vertebral body being positioned and a connection part connecting the ends of the upper support part and the lower support part to each other; And a sliding member which slides between the upper support part and the lower support part to widen or narrow the gap between the upper support part and the lower support part. Therefore, the cage can be easily operated.

Description

Intervertebral expandable cage {A lumbar expandable cage}

The present invention relates to an intervertebral expansion cage for expanding a narrowed spacing between vertebral bodies.

In general, a human spine is composed of a plurality of vertebral bodies, and intervertebral discs, called discs, are located between adjacent vertebral bodies to support flexible movement of the spine and to support straightening of the vertebral bodies.

On the other hand, the intervertebral disc is normally located 23 people, formed of fibrous cartilage having a strong elasticity and expandability, the size and thickness of the intervertebral disc is configured differently.

When such intervertebral discs are broken, lubrication is lost between adjacent vertebral bodies and the nerve is compressed to cause back pain.

Low back pain caused by the intervertebral discs can be treated with low back pain. If the back pain is severe, spinal fusion is performed.

Conventional spinal fusion is one of the methods of removing the portion of the disk pressing the nerve so that the damaged disk does not compress the nerve, and by installing a screw on the vertebral body to fix the vertebral body so that adjacent vertebral bodies do not press the damaged disk.

However, spinal fusion using screws has a problem in that the body is largely incision because the screws are installed in adjacent vertebrae, and if the screw is released due to excessive movement, the procedure must be performed again.

In order to solve this problem, the "Cage for Intervertebral Fusion" of Korean Patent Publication No. 10-2004-00022602 (published date, 2004.3.16) has been disclosed.

Conventional interbody fusion cage has a central opening is formed, the front portion entering the first when intervertebral interbody insertion, extending from the front facing each other, the left and right sides formed with a plurality of side openings connected to the central opening, It is formed on the upper and lower surfaces of the left and right sides, respectively, the upper and lower surfaces formed with one or more threaded protrusions to prevent movement by contact with the vertebral body during intervertebral body insertion, and extending from the left and right sides and facing the anterior part, the vertebral body One or more fixing pins for preventing movement during liver insertion are configured to be integrally formed with the rear portion formed on the upper and lower surfaces.

Conventional interbody fusion cages configured as described above were inserted into the cage between the vertebral bodies adjacent to each other instead of screws, so that the body can be incised to a small size, it was possible to easily perform intervertebral fusion surgery.

However, the conventional intervertebral fusion cage has a problem that it is difficult to install a cage of a size higher than the limited height because the height that can be inserted between the vertebral body is limited.

In addition, since the rigidity of the cage is limited because it is formed of a single material, when a large force is applied, it is not only easily broken, but also formed of a plastic material that is not photographed by X-ray imaging, and thus it is difficult to grasp the treatment state.

The present invention was created to solve the problems described above, the problem to be solved by the present invention is expanded in the cage installed state is easy to install the cage, by combining various types of materials, rigidity It is possible to improve and X-ray imaging to provide an intervertebral expansion cage that can easily grasp the state of the procedure.

In order to achieve the above object, the intervertebral expansion cage according to the present invention is an intervertebral expansion cage inserted between the vertebral bodies to expand the space between the vertebral bodies, the upper support for supporting the vertebral bodies located above the vertebral bodies; A cage main body including a lower support part supporting the vertebral body positioned below the vertebral body and a connection part connecting the ends of the upper support part and the lower support part to each other; And a sliding member which slides between the upper support part and the lower support part to widen or narrow the gap between the upper support part and the lower support part.

Any one or both of the upper support portion and the lower support portion includes an inclined protrusion that protrudes in the direction in which the upper support portion and the lower support portion face each other to widen between the upper support portion and the lower support portion when the sliding member moves. can do.

The sliding member may include a pair of guide parts spaced apart from each other, and a bridge part connecting the guide parts to each other.

The sliding member may further include a pressure bolt which is screwed to the sliding member to slide the sliding member by screwing.

The connection portion may be formed with a bolt insertion hole into which the pressure bolt is inserted.

The cage body may be formed with a guide groove for moving the sliding member is guided.

It may include a guide protrusion inserted into the guide groove to guide the movement of the sliding member.

One or both of the upper support and the lower support may be formed with an inlet hole through which the bone fragment is introduced into the cage main body inserted through the upper support and the lower support.

Any one or both of the upper support portion and the lower support portion is formed with a plurality of protrusions so as to be inclined toward the opposite direction inserted between the vertebral body is prevented from leaving the cage body to prevent the separation of the cage body between the vertebral body It may include.

The cage body may be formed of polyetheretherketone, and the sliding member may be formed of titanium.

The sliding member further includes a pressure bolt that is rotatably coupled to the sliding member, and the connection portion is formed with a bolt insertion hole formed with a screw thread that is screwed with the pressure bolt, and screwing the pressure bolt when the pressure bolt is rotated. By the cage body can be moved sliding in the sliding member.

The cage body further includes a position fixing protrusion that is slid when the sliding member is slid, and the sliding member may be provided with a position fixing groove in which the position fixing protrusion is hung.

According to the present invention, by expanding the size of the cage by using the sliding member in the state in which the cage is installed between the vertebral body, there is an effect that can be easily inserted into the cage between the vertebral body.

In addition, by combining the titanium and polyether ether canton, X-ray imaging is possible, so that it is easy to grasp the state of the procedure after the cage, and there is an effect of improving the strength of the cage.

In addition, since the inflow hole and the communication hole is formed, many bone marrow fragments are introduced into the cage, thereby having a human-friendly effect.

In addition, there is an effect that the sliding member can be easily moved in the cage body by screwing the pressure bolt.

1 is a view schematically showing a state in which the intervertebral expansion cage according to the embodiment of the present invention is performed between the vertebral bodies.
2 is a perspective view illustrating an intervertebral expansion cage according to an embodiment of the present invention.
3 is an exploded perspective view showing the intervertebral expansion cage according to an embodiment of the present invention.
Figure 4 is a side view of the cage body constituting the intervertebral expansion cage according to an embodiment of the present invention.
5 is a plan view of the cage body constituting the intervertebral expansion cage according to an embodiment of the present invention.
6 is a front view showing a slide member constituting the intervertebral expansion cage according to an embodiment of the present invention.
7 is a plan view showing a slide member constituting the intervertebral expansion cage according to an embodiment of the present invention.
8 is a side cross-sectional view illustrating an intervertebral expansion cage according to an embodiment of the present invention.
Figure 9 is a side cross-sectional view showing an intervertebral expansion cage according to an embodiment of the present invention, showing a state in which the sliding member is a sliding movement to expand the intervertebral expansion cage.
10 is a perspective view showing an intervertebral expansion cage according to another embodiment of the present invention.
11 is an exploded perspective view of the intervertebral expansion cage according to another embodiment of the present invention.
12 is a side cross-sectional view illustrating an intervertebral expansion cage according to another embodiment of the present invention.
13 is a perspective view showing an intervertebral expansion cage according to another embodiment of the present invention.
14 is an exploded perspective view showing an intervertebral expansion cage according to another embodiment of the present invention.
15 is a side cross-sectional view showing an intervertebral expansion cage according to another embodiment of the present invention.

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

First, as shown in FIG. 1, in the present specification, the intervertebral body 230 means between the intervertebral bodies 210 adjacent to each other, more specifically, the intervertebral disc (椎間 圓 板).

As shown in Figures 2 to 5, the intervertebral body expansion cage 100 according to an embodiment of the present invention may include a cage body (110).

The cage body 110 is inserted between the intervertebral body 230 to expand the space between the intervertebral body 230 more specifically the vertebral body in the form of spaced apart between the adjacent vertebral body 210 and the vertebral body 210 with each other. The space of the liver 230 may be expanded.

On the other hand, the cage body 110 may include an upper support portion (120). The upper support part 120 may support the vertebral body 210 positioned at an upper portion in the intervertebral body 230.

In addition, the inlet hole 121 may be formed in the upper support part 120. The inlet 12 is a bone fragment (tissue of the vertebra) is introduced into the cage body 110 inserted into the intervertebral body 230, the cage body 110 can be firmly fixed in the intervertebral body 230.

In addition, the upper support portion 120 more specifically, the separation preventing protrusion 123 protruding upward from the upper surface of the upper support portion 120 may be formed.

The departure preventing protrusion 123 may be supported by the vertebral body 210 positioned above the intervertebral body 230 to prevent the cage body 110 from being separated from the intervertebral body 230.

On the other hand, the departure prevention protrusion 123 is inclined toward the opposite direction in which the cage body 110 is inserted into the intervertebral body 230 so that the cage body 110 can be easily inserted into the intervertebral body 230. A plurality of wedge shapes may be formed.

In addition, the upper support part 120 may include an inclined protrusion part 125. The inclined protrusion 125 may be formed to protrude downward from the bottom of the upper support portion 120 and may be formed at an end portion in the opposite direction connected to the connection portion 150 to be described below in the upper support portion 120. have.

On the other hand, the inclined protrusion 125 may be formed to protrude downward gradually toward the opposite end of the connecting portion 150 is connected to the upper support 120.

The cage body 110 may include a lower support portion 130. The lower support portion 130 may support the vertebral body 210 positioned at the lower portion of the intervertebral body 230, and may be disposed in parallel with the upper support portion 120.

In addition, the inlet hole 131 may be formed in the lower support 130. The inlet hole 131, the bone fragments (tissue of the vertebra) is introduced into the cage body 110 inserted into the intervertebral body 230, it is possible to firmly fix the cage body 110 in the intervertebral body 230.

In addition, the lower support 130 may be formed in more detail, the separation preventing protrusion 133 protruding downward from the bottom of the lower support 130.

The departure preventing protrusion 133 may be supported by the vertebral body 210 positioned above the intervertebral body 230 to prevent the cage body 110 from being separated from the intervertebral body 230.

On the other hand, the escape prevention protrusion 133 is inclined toward the opposite direction in which the cage main body 110 is inserted into the intervertebral body 230 so that the cage main body 110 can be easily inserted into the intervertebral body 230. A plurality of wedge shapes may be formed.

Here, the lower support portion 130 may be configured to face the lower portion of the upper support portion 120 in the same shape as the upper support portion 120.

The lower support 130 may include an inclined protrusion 135. The inclined protrusion 135 may be formed to protrude upward from the upper surface of the lower support 130, that is, the surface facing the upper support 120, and from the lower support 130 to the connection portion 150 to be described below. It may be formed at the opposite end portion to be connected.

On the other hand, the inclined protrusion 135 may be formed to protrude upward gradually toward the opposite end of the connecting portion 150 is connected to the lower support 130.

The cage body 110 may include a connection unit 150. The connection part 150 may connect the upper support part 120 and the lower support part 130 which are spaced apart vertically.

At this time, the connection part 150 connects the opposite ends of the upper support part 120 and the lower support part 130 to each other, and more specifically, the connection part 150 is the cage body 110 is inserted into the intervertebral body 230 It is preferable to connect the opposite ends.

In the center of the connection portion 150 is a bolt insertion hole 151 is inserted into the pressing bolt 190 constituting the sliding member 170 to be described below is inserted between the upper support portion 120 and the lower support portion 130 Can be formed.

In addition, the cage main body 110 may be formed with a guide groove 140. The guide groove 140 may guide the movement of the sliding member 170.

On the other hand, the guide groove 140 may be formed on both side surfaces of the connecting portion 150.

In addition, the cage body 110 may be formed of polyetheretherketone (PEEK).

Polyetherethercatone is a high-performance biocompatible material to replace titanium, and can be manufactured by various methods such as injection molding, molding, processing, and extrusion methods as well as metal, and is resistant to impact and abrasion. It is a material with high mechanical strength and excellent radiation stability in various temperature ranges.

As such, when the cage body 110 is formed of a polyether ether canton, the affinity of the body is high to minimize the rejection reaction to the body, as well as the strength can be transplanted to the body for a long time.

As shown in FIGS. 2, 3, 6, and 7, the intervertebral expansion cage 100 according to an embodiment of the present invention may include a sliding member 170. The sliding member 170 is moved between the upper support portion 120 and the lower support portion 130 of the cage body 110 in the direction in which the cage body 110 is inserted into the intervertebral body 230, the upper support portion 120 ) And the space between the lower support 130 may be widened or narrowed.

8 and 9, the sliding member 170 protrudes so that the sliding member 170 slides in the cage main body 110 to face each other of the upper support part 120 and the lower support part 130. When the inclined protrusions 125 and 135 are formed, the space between the upper support part 120 and the lower support part 130 is widened. When the sliding member 170 returns to the initial position, the upper support part 120 and the lower support part 130 are formed. The gap between the upper support portion 120 and the lower support portion 130 may be widened or narrowed so that the space between the upper and lower portions is narrowed again.

On the other hand, the sliding member 170 may include a guide portion 171 and the bridge portion 173. The guide part 171 may be arranged in a plate shape so that the pair is spaced apart from each other.

At this time, the guide portion 171 may be located at both sides between the upper support portion 120 and the lower support portion 130 in the direction in which the cage body 110 is inserted, the end of the guide portion 171 more specifically the cage The end portion of the guide part 171 where the connection part 150 of the main body 110 is positioned is seated in the guide groove 140 so that the guide part 171 guides the guide groove 140 when the sliding member 170 moves. You can move in the form of.

In addition, the guide protrusion 175 may be formed in the guide part 171. The guide protrusion 175 can guide the movement of the sliding member 170 across the side of the cage body 110.

Meanwhile, as shown in FIG. 6, the guide protrusion 175 may be formed to protrude upward and downward from the outside of the pair of opposing guide parts 171.

When the guide protrusion 175 is formed on the sliding member 170, the guide protrusions 175 are formed on both sides of the cage body 110 to which the guide protrusions 175 are in contact, that is, on both sides of the upper support part 120 and the lower support part 130. 175 may be formed with a projection guide groove is guided.

The bridge portion 173 may connect the middle portions of the pair of opposing guide portions 171 to each other, and the guide portion 171 includes a fastening hole 174 penetrated in the direction in which the sliding member 170 slides. The thread may be formed on the inner circumferential surface of the fastening hole 174.

In addition, the sliding member 170 may have a communication hole 177 into which the bone fragments are introduced. On the other hand, a plurality of communication holes 177 may be formed in the guide portion 171 in the form of penetrating the guide portion 171 of the sliding member 170.

The sliding member 170 may include a pressure bolt 190. The pressure bolt 190 is screwed with the sliding member 170 can slide the sliding member 170 by screwing the sliding member 170.

For example, when the pressing bolt 190 screwed to the sliding member 170 in the state that the pressing bolt 190 is pressed in a direction in which the screw is loosened, the sliding member 170 is the head (from the pressing bolt 190) Since 191 is pushed by the screwing force in the opposite direction in which it is located, it is possible to further increase the pressing force for pressing the sliding member 170 to slide the sliding member 170.

On the other hand, the pressing bolt 190 is disposed side by side in the direction in which the sliding member 170 is sliding movement, the outer peripheral surface is formed with a screw thread can be screwed into the fastening hole 174 formed in the bridge portion 173.

In addition, the pressure bolt 190 may be provided with a head 191, the head 191 is coupled to the pressure mechanism for pressing the sliding member 170 to correspond to the pressure mechanism so as to rotate the pressure bolt 190. Coupling groove 193 having a polygonal shape of the shape can be formed.

Here, when the pressure bolt 190 is screwed to the sliding member 170, the head 191 of the pressure bolt 190 may be screwed in the form that the bolt insertion hole 151 of the connecting portion 150 is inserted. .

In addition, the sliding member 170 more specifically, the end of the guide portion 171 toward the inclined protrusions 125 and 135 of the upper support portion 120 and the lower support portion 130 is the guide portion 171 to the inclined protrusions 125 and 135. It may be formed in an arc shape to easily enter.

In addition, the sliding member 170 may be formed of titanium (titanium) that is different from the cage body 110. Here, by forming the sliding member 170 of titanium, X-ray imaging after the intervertebral expansion cage 100, the sliding member 170 is photographed to facilitate the check of the procedure.

For example, when the sliding member 170 is also formed of the same polyether ether canton as the cage body 110, since the polyether ether canton is not photographed by X-ray imaging, the intervertebral expansion cage 100 is treated. There is a problem that the confirmation of the postoperative state is difficult.

The operation and effect between the above-described respective constitutions will be described.

As shown in FIG. 8, the intervertebral expansion cage 100 according to the embodiment of the present invention includes a cage body 110, more specifically, a sliding member between the upper support portion 120 and the lower support portion 130. 170 is inserted to be slidable.

At this time, the sliding member 170 more specifically the guide groove 140 formed in the connecting portion 150 of the guide portion 171 of the guide portion 171 of the sliding member 170 is located in the connecting portion 150 of the cage body 110. The guide member 171 may be guided and moved to the guide groove 140 when the sliding member 170 is slid and moved.

Then, the sliding member 170 is screwed to the bridge portion 173 of the sliding member 170 in a state in which the head 191 of the pressing bolt 190 is located in the connecting portion 150.

In this way, the intervertebral expansion cage 100 is configured to cut the part of the body to be installed the intervertebral expansion cage 100, and insert the intervertebral expansion cage 100 into the intervertebral body 230 through the cut portion. .

At this time, the intervertebral interbody extension cage 100 is inserted into the intervertebral body 230 so that the opposite direction where the connection part 150 of the cage body 110 is located faces the intervertebral body 230.

In this state, the intervertebral body is extended to the intervertebral body 230 in the state in which the end of the pressure mechanism is coupled to the coupling groove 193 of the head 191 of the pressure bolt 190 inserted into the instrument insertion hole formed in the cage body 110. Pressurize the cage 100 to be inserted.

As such, when the intervertebral expansion cage 100 is pressed, the narrowed space of the intervertebral body 230 is expanded by the upper supporter 120 and the lower supporter 130, thereby inserting the intervertebral extension cage 100.

At this time, the intervertebral expansion cage 100 is pushed up and down by the vertebral bodies 210 adjacent to each other, so that the intervertebral expansion cage 100 is inserted into the pressure mechanism because the sliding member 170 is not easily moved. Rotate the pressing bolt 190 in the direction in which the screw is loosened to the sliding member 170 in the pressing bolt 190 in a state of pressing in the direction.

When the pressure bolt 190 is rotated as shown in FIG. 9, since the pressure bolt 190 is pressed by the pressing force, the sliding member 170 screwed to the pressure bolt 190 is relatively screwed. Sliding movement in the direction in which the pressing force acts on the pressing bolt 190 by the fastening.

That is, when the pressure bolt 190 is rotated in a direction in which the pressure bolt 190 is released in a pressurized state, a force for pressing the pressure bolt 190 by screwing is increased, such that the sliding member 170 is cage body 110. Sliding can be easily moved in.

On the other hand, the sliding member 170 sliding by the pressing force in the cage body 110 enters between the inclined protrusions (125, 135) formed in the upper support portion 120 and the lower support portion 130 of the cage body 110, inclined The interval between the upper support part 120 and the lower support part 130 is widened by the sliding members 170 entering the protrusions 125 and 135, so that the intervertebral body 230 may be larger than the intervertebral body 230 in which the conventional cage is inserted. It can be expanded further.

At this time, the inclined protrusions 125 and 135 formed on the upper support 120 and the lower support 130, respectively, protrude about 1 mm in a direction facing each other, so that when the sliding member 170 enters the inclined protrusions 125 and 135, the intervertebral bodies ( 230 can be extended further by approximately 2 mm.

Here, because the intervertebral expansion cage 100 has a problem that it is difficult to insert into the intervertebral body 230 as the height is higher, when the intervertebral expansion cage 100 is inserted and expanded after insertion as described above, the intervertebral expansion cage 100 is There is an advantage of easy operation.

In addition, when the intervertebral extension cage 100 is inserted as described above, the incision is closed and the X-ray photograph is performed to determine the position of the sliding member 170 of the intervertebral extension cage 100. Figure out the status of the procedure.

Therefore, the intervertebral expansion cage 100 according to the present invention is easy to operate the intervertebral expansion cage 100.

In addition, since the sliding member 170 and the cage main body 110 are formed of titanium and polyether ether cantons of different materials, not only the treatment state can be easily understood, but also the intervertebral extension cages formed of the same material ( Stiffness higher than 100).

In addition, since the inlet holes 121 and 131 and the communication hole 177 of the cage body 110 and the sliding member 170 are formed, there are many empty spaces so that the bone fragments can be introduced into the inside of the intervertebral expansion cage 100. There is human body friendly.

In addition, the sliding member 170 can be easily moved by the cage body 110 by the pressure bolt 190.

Hereinafter, another embodiment of the present invention will be described. In another embodiment, the same configuration as the one embodiment with the same reference numerals, the same configuration has the same action and effect, so a detailed description thereof will be omitted.

As shown in Figure 10 to 12, the intervertebral body expansion cage according to another embodiment of the guide protrusion 175 the sliding member 170 more specifically protrudes from the center portion of the guide portion 171 to the upper and lower Each of the guide grooves 140 may include a guide portion 171 of the upper support portion 120 and the lower support portion 130. The upper and lower surfaces in contact with each other may be formed.

In addition, the interbody intervertebral extension cage according to another embodiment has a bridge portion 173 of the sliding member 170 at the end of the pair of guide portions 173, more specifically, the connection portion 150 is located at the cage body 110. End portions are configured to connect with each other, the bridge portion 173 may be located on the outer surface of the connecting portion 150.

In addition, the bridge portion 173 may be coupled to the fastening hole 174 formed in the bridge portion 173 so that the pressure bolt 190 is rotatable. At this time, the fastening hole 174 does not need to be formed with a thread.

On the other hand, the pressure bolt 190 has a screw groove 195 is formed around the middle of the head 191, the stop screw 198 on both sides of the bridge portion 173 penetrates to the fastening hole to the fastening hole The pressing bolt 190 may be rotatably coupled to the bridge portion 173 in the form of being inserted into the screw groove 195 of the head being positioned.

In addition, a screw thread is formed in the bolt insertion hole 151 formed in the connection part 150, and may be screwed into the pressure bolt 190.

The intervertebral body expansion cage of another embodiment configured as described above, unlike the embodiment, the sliding member 170 is pressed against the cage body 110 when the pressure bolt 190 coupled to the sliding member 170 is pressed bolt 190 It can be configured to slide by screwing).

That is, when the interbody intervertebral extension cage according to another embodiment is inclined, the ends of the guide part 171 are formed in the upper support part 120 and the lower support part 130 when the sliding member 170 is coupled to the cage body 110. The sliding bolt 170 is positioned in the cage body 110 by rotating the pressure bolt 190 to be positioned in the state before entering the protrusions 125 and 135.

In this state, the intervertebral interbody extension cage is pressurized and installed between the vertebral bodies by using a pressure mechanism, and finally, the sliding member 170 is slid from the cage body 110 by screwing by rotating the pressure bolt 190. By moving to allow the end of the guide portion 171 to enter between the inclined protrusions 125 and 135, the distance between the vertebral bodies can be further extended.

Hereinafter, another embodiment of the present invention will be described. In another embodiment, the same configuration as the one embodiment with the same reference numerals, the same configuration has the same operation and effect, so a detailed description thereof will be omitted.

As shown in Figures 13 to 15, the intervertebral expansion cage according to another embodiment of the present invention is characterized in the sliding member 170.

The sliding member 170 includes a guide portion 171 and a bridge portion 173 as in one embodiment, except that the bridge portion 173 in the cage body 110 as in one embodiment. It may be configured to connect the ends of the guide portion 171 in which the inclined protrusions 125 and 135 are located in the opposite direction, not the direction in which the connecting portion 150 is located.

In addition, the position fixing groove 179 may be formed in the sliding member 170. The position fixing groove 179 is a groove that can fix the position of the sliding member 170 in the cage body 110, may be formed on the upper and lower portions of the guide portion 171, respectively.

At this time, the cage body 110 more specifically, the upper support portion 120 and the lower support portion 130 may be formed with position fixing protrusions 127 and 137 inserted into the position fixing grooves 179.

On the other hand, the position fixing projections (127,137) and the position fixing grooves (179) is a sliding member 170 in the cage body 110 by sliding the guide portion 171 enters the inclined protrusions (125, 135) cage body 110 Position fixing protrusions (127,137) in the position fixing groove 179 in the state of extending the height of the sliding member 170 may be configured to be fixed.

In addition, the guide protrusion 175 formed in the guide part 171 is formed so that the pair of guide parts 171 protrude from the upper and lower ends of the inner end facing each other, the guide groove 140 is the guide protrusion 175 It may be formed on the upper and lower surfaces of the inner side of the upper support portion 120 and the lower support portion 130 corresponding to the position.

The intervertebral expansion cage according to another embodiment of the present invention configured as described above is inserted into the intervertebral body between the intervertebral extension cage by using the pressurizing mechanism, and then inserts the pressurizing mechanism through the bolt insertion hole 151 of the cage body. By pressing the sliding member 170 to enter between the inclined protrusions 125 and 135 at 110, the space between the intervertebral bodies 230 may be further extended.

At this time, when the sliding member 170 enters between the inclined protrusions 125 and 135, the positioning protrusions 127 and 137 are inserted into the position fixing grooves 179, thereby easily positioning the sliding member 170 in the cage body 110. Can be fixed

In addition, in another embodiment of the present invention, the pressure bolt (not shown) is screwed into the bolt insertion hole 151 of the connection portion 150, the end of the pressure bolt to the bridge portion 173 of the sliding member 170 By being supported, the sliding member 170 may be configured to slide by the pressure bolt in the form of pressing the bridge portion 173 by moving by screwing the pressure bolt during rotation of the pressure bolt.

While the present invention has been particularly shown and described with reference to exemplary embodiments, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, And all changes and modifications to the scope of the invention.

100: interbody extension cage 110: cage body
120: upper support 121,131: inlet hole
123,133: departure preventing protrusion 125,135: inclined protrusion
127, 137: positioning protrusion 130: lower support
140: guide groove 150: connection portion
151: bolt insertion hole 170: sliding member
171: guide portion 173: bridge portion
174: fastener 175: guide protrusion
177: communication hole 179: position fixing groove
190: pressure bolt 191: head
193: coupling groove 195: screw groove
198: set screw 210: vertebral body
230: intervertebral column

Claims (12)

An intervertebral expansion cage inserted between the vertebral bodies to expand the space between the vertebral bodies,
Cage including an upper support for supporting the vertebral body located above the vertebral body, a lower support for supporting the vertebral body located below the vertebral body, and a connecting portion connecting the ends of the upper support and the lower support to each other. main body; And
And a sliding member sliding and moving between the upper support and the lower support to widen or narrow the gap between the upper support and the lower support.
The sliding member includes:
An intervertebral interbody extension cage further comprising a pressurizing bolt screwed to the sliding member to slide the sliding member by screwing. The method of claim 1,
Any one or both of the upper support and the lower support
The upper support and the lower support between the intervertebral extension cage, characterized in that the protruding in a direction facing each other comprising an inclined protrusion extending between the upper support and the lower support when the sliding member moves. The method of claim 1,
The sliding member
A pair of guide parts spaced apart from each other, and
Interbody extension cage characterized in that it comprises a bridge portion for connecting the guide portion to each other. delete The method of claim 1,
The connection part
Interbody extension cage, characterized in that the bolt insertion hole is formed is the pressure bolt is inserted. The method of claim 1,
The cage body
Interbody extension cage, characterized in that the guide groove is formed to move the sliding member is guided. The method according to claim 6,
The sliding member
Interbody interbody cage, characterized in that it comprises a guide protrusion inserted into the guide groove for guiding the movement of the sliding member. The method of claim 1,
Any one or both of the upper support and the lower support
The intervertebral expansion cage, characterized in that the inlet hole through which the bone fragments are introduced into the cage body inserted into the intervertebral body through the upper support and the lower support. The method of claim 1,
Any one or both of the upper support and the lower support
And a plurality of protrusions formed to protrude so that the cage main body is inclined toward the opposite direction inserted between the vertebral bodies, and includes an escape preventing protrusion for preventing the cage main body from being separated from the vertebral bodies. The method of claim 1,
The cage body is
Formed of polyetheretherketone,
The sliding member is interbody extension cage, characterized in that formed of titanium (titanium). The method of claim 1,
The sliding member
Further comprising a pressure bolt coupled to the sliding member rotatably,
The connecting portion is formed with a screw insertion hole formed with a screw thread is screwed to the pressure bolt is the intervertebral expansion cage, characterized in that the sliding member is sliding by the screwing when the pressure bolt is rotated. The method of claim 1,
The cage body is
The sliding member further includes a position fixing projection that is caught during the sliding movement,
The sliding member is an intervertebral expansion cage, characterized in that the position fixing groove is formed to span the position fixing projections.

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