Height-adjustable interbody fusion cage

Abstract

The present disclosure relates to a height-adjustable intervertebral fusion device, which is configured to be inserted between vertebral bodies at a minimum height, and whose fixing force is improved due to bone screws inserted through end plates. The intervertebral fusion device of the present disclosure can replace intervertebral fusion devices having a height within a given range. Therefore, for manufacturers, the number of product groups that need to be produced and the inventory can be reduced. In addition, unlike conventional intervertebral fusion devices having a preset height at preset intervals, the height of the intervertebral fusion device of the present disclosure can be linearly adjusted according to the distance between the patient's vertebrae, so that surgery can be performed at an optimal height according to the patient's condition.

Description

Technical Field

[0001] The present disclosure relates to a height-adjustable intervertebral fusion cage, and more particularly, to an intervertebral fusion cage which is configured to be inserted between vertebral bodies with a minimum height and whose fixing force is improved due to bone screws inserted through end plates. Background Art

[0002] The spine consists of 32 to 35 vertebrae and intervertebral disks, or discs. The spine is the central part of the body connecting the skull at the top and the pelvis at the bottom.

[0003] The spine consists of 7 cervical vertebrae, 12 thoracic vertebrae, 5 lumbar vertebrae, 5 sacral vertebrae, and 3 to 5 coccyx vertebrae. In adults, the 5 sacral vertebrae are fused into one sacrum, and the 3 to 5 coccyx vertebrae are fused into one coccyx.

[0004] Spinal fusion is a treatment method for long-term and serious spinal diseases. In spinal fusion, the intervertebral disk is removed and a cage is inserted between adjacent vertebrae as a replacement to fuse the adjacent vertebrae to each other.

[0005] According to the insertion direction of the fusion device, spinal fusion surgery for the lumbar spine can be divided into posterior lumbar interbody fusion (PLIF), transforaminal lumbar interbody fusion (TLIF), lateral lumbar interbody fusion (LLIF), oblique lumbar interbody fusion (OLIF), anterior lumbar interbody fusion (ALIF), etc.

[0006] Posterior lumbar interbody fusion (PLIF) is a method in which an incision is made along the center line of the spine to completely expose the vertebral body, a portion of the posterior spine is removed, the intervertebral disc is removed, and a PLIF fusion cage is inserted.

[0007] Posterior lumbar interbody fusion (PLIF) is the oldest method of spinal fusion and is an essential method when fusing two or three vertebrae together. However, posterior lumbar interbody fusion has the following disadvantages: due to the surgical procedure, there is a high possibility of adhesion in the nerves, ligaments and muscles, and due to the large incision area and long recovery time, some patients may have serious sequelae.

[0008] For the PLIF cage, a pair of small cages are placed on the left and right sides, and have the smallest size among all the cages used for interbody fusion.

[0009] Transforaminal lumbar interbody fusion (TLIF) is a surgical method in which a small incision is made along both sides of the spinal muscles to expose the vertebral body to a minimum, and then the spinal joint area is removed to expose the neural foramen, and a TLIF fusion device is inserted to replace the intervertebral disc. This surgical method has little bleeding and can reduce the operation time, so it is suitable for single joint surgery, but when surgery is required on multiple sites, PLIF surgery should be performed. Since the TLIF fusion device is mostly formed in an arc shape, by inserting the TLIF fusion device between the vertebral bodies and rotating it, the protruding part of the TLIF fusion device faces the abdomen. The TLIF fusion device is larger than the PLIF fusion device, however, its support area is smaller than the support area of ​​the LLIF fusion device or ALIF fusion device described later.

[0010] Anterior lumbar interbody fusion (ALIF) has many advantages, such as faster recovery from surgery and no need to worry about adhesions. However, it requires very skilled techniques because it is performed while approaching the spine while cutting the front (abdomen) and pushing the internal organs away. The advantage of the ALIF cage is that it has the largest support area among all spinal fusion cages.

[0011] As such an ALIF fusion device, a self-supporting fusion device (Integrated Cage) having holes is disclosed (US 2014-0277487A), wherein screws can be inserted through the holes and fixed to the vertebral body to prevent the fusion device from being detached after surgery.

[0012] In addition, US9585762 and US2019-0133782A disclose a self-supporting ALIF fusion device with an adjustable height. However, in US9585762, the height of the fusion device is adjusted by a vertical ratchet 302, and what is actually adjusted is the angle, not the height. For US2019-0133782A, although its height can be adjusted, its structure is too complicated and therefore not easy to manufacture.

[0013] [Prior art literature]

[0014] [Patent Document]

[0015] (Patent Document 1) US9585762B2

[0016] (Patent Document 2) US2019-0133782A

[0017] (Patent Document 3) US2014-0277487A Summary of the invention

[0018] Technical issues

[0019] In order to solve the aforementioned technical problems, the present invention aims to provide a spinal fusion device which can be inserted between vertebrae at a minimum height, can adjust the height in the inserted state and can stably support the movement of a pair of end plates. In particular, the fixing force of the intervertebral fusion device is improved due to the bone screws inserted through the end plates.

[0020] Technical Solution

[0021] In order to achieve the aforementioned objectives, the present disclosure provides an intervertebral fusion device, characterized in that it comprises: a first distal end and a second distal end, which contact adjacent vertebral bodies; a distal moving block, which is fixed so as to be movable relative to a plate inclined portion formed at one end of the first end plate and the second end plate; a proximal moving block, which is fixed so as to be movable relative to a plate inclined portion formed at the other end of the first end plate and the second end plate; an adjusting component, which is rotatably fixed to the proximal moving block and screwed to the distal moving block so as to be able to adjust the distance between the distal moving block and the proximal moving block; and a first guide portion , which is formed on the first end plate toward the second end plate; a second guide portion, which is formed on the second end plate toward the first end plate and constrains the movement direction of the first end plate and the second end plate to approach or separate from each other by sliding with the first guide portion; a bone screw, which is inserted through the bone screw hole formed in the first end plate and the second end plate; and a locking component, which is combined with the proximal moving block to prevent the bone screw from detaching, wherein the first guide portion and the second guide portion are formed to support the load of the first end plate and the second end plate in the length direction or the width direction.

[0022] The intervertebral fusion cage is characterized in that block sliders are formed at the distal moving block and the proximal moving block, and a plate slider is formed at the plate inclined portion and slides relative to the block sliders.

[0023] The intervertebral fusion device is also characterized in that the block sliding pieces of the distal moving block are arranged on both sides of the block inclined portion corresponding to the plate inclined portion, block auxiliary sliding pieces are arranged on the outer sides of the block sliding pieces arranged on the two sides, and plate auxiliary sliding pieces corresponding to the block auxiliary sliding pieces are formed on the first end plate and the second end plate.

[0024] In addition, the intervertebral fusion cage is further characterized in that a block reinforcing inclined portion is formed at a central portion of the block inclined portion, and reinforcing inclined portions corresponding to the reinforcing inclined portion are formed on the first end plate and the second end plate.

[0025] Furthermore, the intervertebral fusion cage is characterized in that the adjustment component has a bolt portion at one end that is bolted to the distal moving block, and has an adjustment component support surface at the other end that can rotate relative to the proximal moving block at a predetermined position.

[0026] In addition, the intervertebral fusion cage is further characterized in that the first guide portion includes a pillar protruding toward the second end plate, and the second guide portion includes an extension wall protruding toward the first end plate to enable the pillar to slide.

[0027] Furthermore, the intervertebral fusion cage is characterized in that a receiving portion is formed around the support column, and the receiving portion can receive the extension wall when the first end plate and the second end plate are close to each other.

[0028] Furthermore, the intervertebral fusion cage is characterized in that a guide groove is formed on the extension wall for guiding the insertion of the pillar.

[0029] In addition, the intervertebral fusion cage is further characterized in that a gap cut portion is formed on the extension wall, which prevents interference with the bone screw.

[0030] In addition, the intervertebral fusion device is characterized in that the locking component includes a locking plate for covering the bone screw and a locking bolt that passes through the locking plate and is fixed to the proximal moving block, wherein a locking bolt coupling portion is formed in the proximal moving block, which can couple the locking bolt to the front end of the adjusting component.

[0031] Furthermore, the intervertebral fusion cage is further characterized in that a locking protrusion is formed at the rear end of the locking plate and protrudes toward the bone screw.

[0032] Furthermore, the intervertebral fusion cage is further characterized in that the locking bolt contacts and supports the adjusting member when the locking bolt is re-engaged.

[0033] In addition, the intervertebral fusion cage is characterized in that a non-threaded anchor portion is formed at the distal end of the bone screw.

[0034] In addition, the anchor portion is characterized by an anchor groove extending in the length direction of the bone screw.

[0035] Furthermore, the anchor portion is characterized by having anchor protrusions protruding radially.

[0036] Beneficial Effects

[0037] According to the present disclosure, one fusion cage can be used to replace a fusion cage having a height within a given range. Therefore, for the manufacturer, the number of product groups and the inventory required to be produced can be reduced. Moreover, unlike a conventional intervertebral fusion cage having a preset height at a preset interval, the height of the intervertebral fusion cage of the present disclosure can be linearly adjusted according to the distance between the patient's vertebrae, so that surgery can be performed at an optimal height according to the patient's condition.

[0038] In addition, since the fusion cage can be inserted at a minimum height, there is no need to additionally produce a test insert according to an appropriate intervertebral spacing, and medical personnel do not need to sequentially insert a plurality of test inserts and secure insertion space. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 FIG. 4 is a front perspective view of an intervertebral fusion cage in a state of minimum height according to an embodiment of the present disclosure.

[0040] Figure 2 for Figure 1 Superoposterior perspective view of the intervertebral fusion cage shown in .

[0041] Figure 3 FIG. 4 is a top front perspective view of an intervertebral fusion cage according to an embodiment in a state of maximum height.

[0042] Figure 4 for Figure 3 A superior posterior perspective view of the interbody fusion cage is shown.

[0043] Figure 5 FIG. 4 is an exploded view of an intervertebral fusion cage according to an embodiment.

[0044] Figure 6 FIG. 4 is an exploded upper and rear view of an intervertebral fusion cage according to an embodiment.

[0045] Figure 7 is a perspective view of a locking plate combined with an intervertebral fusion cage according to an embodiment.

[0046] Figure 8 is an upper front perspective view of a first end plate according to an embodiment.

[0047] Fig. 9 for Figure 8 A lower rear perspective view of the first end plate is shown.

[0048] Fig.10 is an upper front perspective view of a second end plate according to an embodiment.

[0049] Fig.11 for Fig.10 A lower rear perspective view of the second end plate is shown.

[0050] Fig.12 is an upper front perspective view of a proximal movement block according to an embodiment.

[0051] Fig.13 for Fig.12 A superior posterior perspective view of the proximal translation block is shown.

[0052] Fig.14 is a top front perspective view of a distal movement block according to an embodiment.

[0053] Fig.15 for Fig.14 A superior posterior perspective view of the distal translation block is shown.

[0054] Fig.16 is a perspective view of an adjustment component according to an embodiment.

[0055] Fig.17 is an upper front perspective view of a lock plate according to an embodiment.

[0056] Fig.18 for Fig.17 An upper rear perspective view of the locking plate is shown.

[0057] Fig.19 FIG. 4 is an upper front perspective view of a locking bolt according to an embodiment.

[0058] Fig. 20 This is the first example of the bone screw used in the embodiment.

[0059] Fig.21 This is a second example of the bone screw used in the embodiment.

[0060] Fig. 22 This is a third example of the bone screw used in the embodiment.

[0061] Fig.23 This is a fourth example of the bone screw used in the embodiment. DETAILED DESCRIPTION

[0062] The preferred embodiments of the present disclosure are described below with reference to the accompanying drawings. When adding reference symbols to the components in the following drawings, the same symbols are used as much as possible for the same components, even though they are shown on different drawings, and the detailed description of the well-known functions and structures that may obscure the gist of the present disclosure is omitted.

[0063] Figures 1 to 7The whole of the intervertebral fusion cage 100 according to the embodiment is shown. Figures 8 to 23 Various elements of the intervertebral fusion cage 100 are shown.

[0064] The intervertebral fusion cage 100 includes: a first end plate 102 and a second end plate 104, which face each other in the up-down direction; a distal moving block 108 and a proximal moving block 106, which are arranged between the first end plate 102 and the second end plate 104 and can move according to the distance between the first end plate 101, 202 and the second end plate 104; an adjusting component 110, which passes through the proximal moving block 106 and is connected to the distal moving block 108; a bone screw 120, which is inserted into the first end plate 102 and the second end plate 104 to be fixed to the vertebral body; and a locking component, which is configured to prevent the bone screw 120 from detaching.

[0065] The first end plate 102 and the second end plate 104 respectively include a first plate body 122 and a second plate body 146, which have tooth-like protrusions on the surface in contact with the vertebral body. The tooth-like protrusions are formed to prevent detachment from the vertebral body and can be deformed into various shapes. In addition, a first window 145 and a second window 172 are formed in the center of the first plate body 122 and the second plate body 146, respectively, so that bone graft can be inserted through the first window 145 and the second window 172.

[0066] In addition, if Figure 8 and Fig. 9 As shown, in the length direction of the first plate body 122, a proximal moving block seat 130 is formed toward the center, and a distal moving block seat 138 is formed away from the center. A plate inclined portion 128 extends from the proximal moving block seat 130, and a pair of plate sliding members 132 facing each other are formed on both sides of the plate inclined portion 128. In addition, a bone screw hole 134 is formed on the outer side of the plate sliding member 132. The bone screw hole 134 is a through hole into which the bone screw 120 can be inserted, and a guide surface 136 can be formed on the entrance side of the bone screw hole 134, which is used to guide the bone screw 120. In addition, a plate inclined portion 139 is formed around the distal moving block seat 138. The plate inclined portion 139 is formed at both ends of the distal moving block seat 138, and plate sliding members 142 are respectively formed on the outer sides of the plate inclined portion 139. And, an auxiliary plate sliding member 144 facing the plate sliding member 142 may be formed at the outer side of the plate sliding member 142. The plate sliding member 132 close to the center and the plate sliding member 142 far from the center are inclined so that the plate sliding member 132 and the plate sliding member 142 are close to the center of the first plate body 122 in the thickness direction of the first plate body 122 from the surface of the first plate body 122.

[0067] Furthermore, a reinforcement inclined portion seat 140 extends from the distal moving block seat 138. The reinforcement inclined portion 200 described below may be located at the reinforcement inclined portion seat 140, and the reinforcement inclined portion seat 140 prevents interference between the reinforcement inclined portion 200 and the first plate 122 when the distal moving block 108 moves.

[0068] Similarly, if Fig.10 and Fig.11 As shown, in the length direction of the second plate body 146, a proximal moving block seat 156 is formed toward the center, and a distal moving block seat 164 is formed away from the center. A plate inclined portion 145 extends from the proximal moving block seat 156, and a pair of plate slides 158 facing each other are formed on both sides of the plate inclined portion 154. In addition, a bone screw hole 160 is formed on the outside of the plate slide 158. The bone screw hole 160 is a through hole into which the bone screw 120 can be inserted, and a guide surface 162 can be formed on the entrance side of the bone screw hole 160, which is used to guide the bone screw 120. In addition, a plate inclined portion 165 is formed around the distal moving block seat 164. The plate inclined portion 165 is formed at both ends of the distal moving block seat 164, and plate slides 168 are respectively formed on the outside of the plate inclined portion 165. And, an auxiliary plate sliding member 170 facing the plate sliding member 168 may be formed at the outer side of the plate sliding member 168. The plate sliding member 158 close to the center and the plate sliding member 168 far from the center are inclined so that the plate sliding member 158 and the plate sliding member 168 are close to the center of the second plate body 146 in the thickness direction of the second plate body 146 from the surface of the second plate body 146.

[0069] Furthermore, a reinforcement inclined portion seat 166 extends from the distal moving block seat 164. The reinforcement inclined portion 200 described below may be located at the reinforcement inclined portion seat 166, and when the distal moving block 108 moves, the reinforcement inclined portion seat 166 prevents interference between the reinforcement inclined portion 200 and the second plate 122.

[0070] like Fig.12 and Fig.13As shown, a block inclined portion 174 is formed on the proximal moving block 106 around a proximal connecting tube body 190 having an adjusting member hole 188, wherein the adjusting member 110 is inserted and supported in the adjusting member hole 188. Block sliders 180 are formed on both sides of the block inclined portion 174, which are slidably coupled to the plate sliders 132 and 158 formed on the first end plate 102 and the second end plate 104. The adjusting member hole 188 includes: a support portion 184, which contacts the adjusting member 110 to support the adjusting member 110; and a support jaw 186, which is formed on the distal side of the support portion 184 to prevent the adjusting member 110 from being disengaged. In addition, a pinhole 178 is formed on the side of the proximal moving block 106 to prevent the adjusting member 110 located at the support portion 184 from being disengaged from the center. A tool seat 176 is formed on the side of the proximal moving block 106 to fix the intervertebral fusion cage 100 using a tool. A locking bolt coupling portion 182 is formed on the proximal side of the region where the adjustment member 110 is inserted, and is coupled to a locking bolt 114 described below.

[0071] like Fig.14 and Fig.15 As shown in , a distal connection tube body 198 is formed at the central portion of the distal moving block 108, which has a moving block threaded portion 202 threadedly connected to the adjusting member 110, and blade portions 196 are formed on both sides of the distal connection tube body 198. The block inclined portion 194 is formed on the blade portion 196, and the block slider 204 is provided on both sides of the blade portion 196. The auxiliary block slider 206 is formed on the outer side of the block slider 204. The block slider 204 and the auxiliary block slider 206 are respectively configured to be slidably coupled to the plate slider 142 and the auxiliary block slider 144 of the first end plate 102 and the plate slider 168 and the auxiliary plate slider 170 of the second end plate 104.

[0072] The distal moving block 108 has a distal wall 192 for easy insertion between vertebral bodies, and the distal wall 192 is formed integrally with the block inclined portion 194. In addition, in the minimum height state, the distal wall 192 contacts the end of the first end plate 102 and the end of the second end plate 104 to form an insertion portion as a whole. In particular, distal curved surfaces 208 are formed on both sides of the distal wall 192 to facilitate insertion.

[0073] A reinforcement slope 200 is formed at the center of the distal moving block 108 to reinforce the distal moving block 108 when the block slider 204 and the auxiliary block slider 206 support a load. As described above, the reinforcement slope 200 is stably positioned while being inserted into the reinforcement slope seat 140 of the first end plate 102 and the reinforcement slope seat 166 of the second end plate 104.

[0074] The distal moving block 108 and the proximal moving block 106 substantially have a wedge-shaped structure, and are configured to push or support the first end plate 102 and the second end plate 104 when the first end plate 102 and the second end plate 104 are raised or lowered.

[0075] The adjustment component 110 may substantially have the following Fig.16 , and the like. In other words, the adjusting component 110 has an adjusting component support surface 210 and an adjusting threaded portion 214. A connecting portion 212 may be formed between the adjusting component support surface 210 and the adjusting threaded portion 214. A needle seat 218 is formed on the proximal side of the adjusting component support surface 210, and a tool groove 216 may be formed in the central portion of the needle seat 218 to provide a driving force to the adjusting component 110. Although the adjusting threaded portion 214 is an external thread, a detailed description is omitted in the drawings.

[0076] The adjusting component support surface 210 contacts the support portion 184 of the distal moving block 108 and is rotatably supported. The adjusting screw portion 214 is threadedly connected to the moving block threaded portion 202 of the adjusting component 110. The moving block threaded portion 202 is an internal thread, but a detailed description is omitted in the accompanying drawings. In addition, since the gap surface on the distal side of the adjusting component support surface 210 contacts the supporting jaws 186, the adjusting component 110 will not disengage from the distal moving block 108 toward the distal side. In addition, the needle component 118 is inserted into the needle seat 218 and is located in the needle seat 218, so that the adjusting component 110 will not disengage in the proximal direction of the distal moving block 108.

[0077] As a result, the adjusting member 120 can be rotated at a given inner position of the adjusting member 110 .

[0078] A pair of pillars 124 are formed on both sides of the first plate body 122 in the thickness direction, i.e., in the direction toward the second end plate 104. Also, a receiving portion 126 is formed around the pillars 124, in which an extension wall 148 to be mentioned below can be received. Also, an extension wall 148 is formed on both sides of the second plate body 146 in the thickness direction, i.e., in the direction toward the first end plate 102, and a groove 150 is formed inside the extension wall 148, which can receive and guide the pillars 124. As a result, since the pillars 124 are received inside the grooves 150 and move up and down therein, the first end plate 102 and the second end plate 104 approach or space each other in a restricted state. Here, the pillars 124 and the extension walls 148 correspond to the first guide portion and the second guide portion. The first guide portion and the second guide portion support the load or torsion in the length direction or width direction of the first end plate 102 and the second end plate 104.

[0079] Furthermore, in a plan view, the extension wall 148 is formed to have an approximately U-shape to surround the support column 124. Furthermore, a clearance cut surface 149 is formed on the extension wall 148 to prevent the extension wall 148 from hindering the insertion of the bone screw 120 when the bone screw 120 is inserted into a narrow space.

[0080] The locking component may include: a locking plate 112 that covers the bone screw 120 ; and a locking bolt 114 that is fixed to the proximal moving block 106 through the locking plate 112 .

[0081] like Fig.17 and Fig.18 As shown, the locking plate 112 has a locking plate body 220 that is approximately plate-shaped, and the cover portion 222 extending from both sides of the locking plate body 220 may be formed to be slightly curved to cover the locking bolt 114. In addition, a locking protrusion 228 may be formed at the rear end of the cover portion 222, that is, the distal end side of the cover portion 222. The locking protrusion 228 may be formed in a substantially hemispherical shape and may be variously deformed. Since the interval between the first end plate 102 and the second end plate 104 may be changed, the interval between the screw heads 236 of the bone screws 120 inserted into the first end plate 102 and the second end plate 104, respectively, may also be changed. Therefore, the locking protrusion 228 is preferably formed as the rear end of the cover portion 222 so that the screw head 236 can be covered in all regions where the interval between the first end plate 102 and the second end plate 104 changes from the smallest to the largest.

[0082] Also, a locking bolt hole 226 is formed at the center of the locking plate body 220 to receive a portion of the locking bolt 114. A locking bolt seat 224 is formed around the locking bolt hole 226 to support the rear end of the locking bolt head 230 of the locking bolt 114. Also, a locking bolt fastening portion 182 is formed at the coupling portion 182 of the proximal moving block 106 so that the locking bolt 114 can be coupled to the front end of the adjusting member 110. The locking bolt coupling portion 182 is an internal thread, but a detailed description is omitted in the drawings.

[0083] The locking bolt 114 includes: a locking bolt head 230, which is configured to be installed on the locking bolt seat 224; a locking threaded portion 234, on which a thread for connecting to the locking bolt connecting portion 182 is formed; and a tool groove 232, which is used to be combined with a tool. In particular, an annular groove can be formed in the locking bolt 114, and a fixing ring 116 can be inserted into the annular groove to prevent the locking bolt 114 from being separated from the locking plate 112.

[0084] When the locking bolt 114 is fastened to the proximal moving block 106, the locking bolt 114 contacts the adjusting member 110, whereby the locking bolt 114 pushes the adjusting member 110. At this time, frictional force is generated between the locking bolt 114 and the adjusting member 110. As a result, frictional force in the threaded region of the adjusting member 110 is enhanced, and therefore, even if a load, particularly a repetitive load, is applied to the first end plate 102 and the second end plate 104, the adjusting member 110 is not loosened.

[0085] Below, refer to Figure 20 to Figure 23 , the bone screw 120 according to the embodiment and bone screws 242, 252, and 264 as modified examples thereof are described.

[0086] Fig. 20 The bone screw 120 shown is a bone screw according to the prior art. The bone screw 120 includes: a screw head 236, which is configured to limit the insertion extent of the bone screw 120 when the bone screw 120 is inserted into the bone screw holes 134 and 160; a tool groove 238, which is formed in the screw head 236 to receive a tool; and a threaded portion 240, which is formed as a whole with the screw head 236 and is configured to be inserted into a vertebral body. The threaded portion 240 includes a double-start thread and a single-start thread, so as to be suitable for both cancellous bone and cortical bone.

[0087] Fig.21The illustrated bone screw 242 includes a screw head 244, a tool slot 246 formed in the screw head 244, and a vertebral body insertion region integrally formed with the screw head 244 and having a threaded portion 248 at a proximal end and an anchor portion 250 at a distal end.

[0088] When performing surgery using an ALIF fusion device, a separate tool such as an awl is required to set the initial direction. In addition, the fixing force of the screw fastened to the cancellous bone is not large, and therefore, the thread in this area is often not very meaningful. Therefore, the bone screw 242 includes an anchor portion 250 formed at the distal end of the threaded portion 248. In this case, no additional tool is required when setting the initial direction, and since the insertion is performed by striking in a certain area, the inconvenience caused by the rotation of the screw can be reduced.

[0089] The anchor portion 250 of the bone screw 242 has a nail shape, wherein only the end of the shank has a hammer-shaped tip for easy insertion.

[0090] Fig. 22 The bone screw 252 shown includes: a screw head 254; a tool groove 256 formed in the screw head 254; a cone insertion area formed as one piece with the screw head 244 and having a screw portion 258 at the proximal end and an anchor portion 260 at the distal end. In addition, an anchor groove 262 is formed in the anchor portion 260.

[0091] The anchoring groove 262 is formed in the length direction of the bone screw 252 and is used to increase the contact area with the bone to enhance the anchoring force.

[0092] Fig.23 The bone screw 264 shown includes: a screw head 266; a tool groove 268 formed in the screw head 266; and a vertebral body insertion region, which is formed as one body with the screw head 268 and has a threaded portion 270 at the proximal end portion and an anchor portion 272 at the distal end portion. In addition, an anchor portion 274 is formed with an anchor groove 274 formed in the anchor portion 272, and an anchor protrusion 276 protruding in the radial direction is formed on the anchor portion 274.

[0093] The anchor groove 274 is formed in the length direction of the bone screw 264 to increase the contact area with the bone to enhance the anchoring force. At the same time, the anchor protrusion 276 can prevent the bone screw 264 from being disengaged.

[0094] The structure of the intervertebral fusion cage 100 is as described above. Next, a surgical method using the intervertebral fusion cage 100 will be described.

[0095] First, a surgical path to the vertebral body is secured using a surgical instrument, and the intervertebral disc is removed. Next, the intervertebral fusion cage 100 is inserted between the vertebral bodies from which the intervertebral disc has been removed while being held by a cage holder (not shown).

[0096] Then, the proximal moving block 106 and the distal moving block 108 are brought closer to each other by inserting a tool such as a screwdriver into the tool slot 216 of the adjustment member 110 and rotating the tool in one direction, whereby the first end plate 102 and the second end plate 104 are spaced apart from each other.

[0097] Then, the bone screw 120 is inserted and fixed to the bone screw hole 134 of the first end plate 102 and the bone screw hole 160 of the second end plate 104. At this time, in order to insert the bone screw 120, a hole is initially formed using a collection called an awl, and the depth of the hole is increased using a drill through the formed hole. Then, a thread whose size is slightly smaller than that of the bone screw 120 is formed by using a collection called a tapper to form a path for the thread to move, and the bone screw 120 is rotated and inserted using a tool such as a screwdriver. The thread formation by the tapper can be omitted.

[0098] However, for Figures 21 to 23 For the bone screws 242, 252, 264, such tools as awls, drills, and tappers are omitted, and the bone screws 242, 252, 264 are directly struck with tools such as mallets to set the direction and initially insert the bone screws 242, 252, 264, and the bone screws 242, 252, 264 are rotated with tools such as clubs to be inserted into the remaining threaded section.

[0099] After the bone screws 120, 242, 252, 264 are inserted as described above, the locking plate 112 is brought close to the proximal moving block 106, and a screwdriver or other tool is used to rotate the locking bolt 114 and connect it to the locking bolt connecting portion 182 of the proximal moving block 106, thereby completing the insertion process of the intervertebral fusion cage 100.

[0100] Similarly, in the case where the intervertebral fusion cage 100 is incorrectly inserted or the intervertebral fusion cage 100 is removed for reoperation, the locking bolt 114 is reversely rotated using a tool such as a screwdriver, thereby separating the locking plate 112 from the proximal moving block 106. Next, the bone screws 120, 242, 252, 264 are detached from the intervertebral fusion cage 100 by rotating the bone screws 120, 242, 252, 264 using a tool such as a screwdriver. In this case, the bone screws 242, 252, or 264 having an anchor portion are separated from the intervertebral fusion cage 100 by unfastening the threaded portion of the bone screws 242, 252, or 264 and pulling out the bone screws 242, 252, or 264 using a tool such as an awl.

[0101] Then, while the intervertebral fusion cage 100 is held by a cage holder (not shown), a tool such as a screwdriver is inserted into the adjustment member 110 and the tool is rotated in the opposite direction to space the proximal moving block 106 and the distal moving block 108 from each other. Next, the first end plate 102 and the second end plate 104 are brought closer to each other to reduce the height of the intervertebral fusion cage 100. Then, the intervertebral fusion cage 100 is removed from the vertebral body.

[0102] Although the present disclosure has been described above with reference to the preferred embodiments, those skilled in the art will appreciate that various modifications and changes can be made to the present disclosure without departing from the spirit and scope of the present disclosure as described in the following claims.

[0103] Industrial Applicability

[0104] According to the present disclosure, only one fusion device can be used for a given height range, thereby reducing inventory, production, and repeated tasks and burdens of medical personnel during surgery. In addition, since the operation time and blood loss can be reduced, the patient recovery time can be significantly shortened. Therefore, the present disclosure can be widely applicable to related fields.

[0105] Explanation of symbols

[0106] 100: intervertebral fusion cage 102: first end plate

[0107] 104: Second end plate 106: Proximal moving block

[0108] 108: distal moving block 110: adjustment component

[0109] 112: Locking plate 114: Locking bolt

[0110] 116: fixing ring 118: needle part

[0111] 120, 242, 252, 264: bone screw 122: first plate

[0112] 124: support 126: receiving groove

[0113] 128, 139, 154, 165: Plate tilting part 130, 156: Near end moving block seat

[0114] 132, 142, 158, 168: Plate slides 134, 160: Bone screw holes

[0115] 136, 162: guide surface 138, 164: far end moving block seat

[0116] 140, 166: Reinforced inclined parts 144, 170: Auxiliary plate sliding parts

[0117] 145: first window 146: second plate

[0118] 148: extension wall 150: groove

[0119] 152: guide groove 154: cutting part

[0120] 172: Second window 174, 194: Block tilting portion

[0121] 176: Machine seat 178: Pinhole

[0122] 180, 204: Block slide 182: Lock bolt connection part

[0123] 184: Supporting part 186: Supporting jaws

[0124] 188: Adjustment component hole 190: Proximal connection tube

[0125] 192: Distal end wall 196: Blade portion

[0126] 198: Distal connection tank 200: Reinforced inclined part

[0127] 202: Moving block threaded portion 206: Auxiliary block sliding member

[0128] 208: Distal curved surface 210: Adjustment component support surface

[0129] 212: Connecting part 212: Adjusting thread part

[0130] 216, 232, 238, 246, 256, 268: tool slot 218: needle seat

[0131] 220: Lock plate body 222: Cover part

[0132] 224: Locking bolt seat 226: Locking bolt hole

[0133] 228: Locking protrusion 230: Bolt head

[0134] 234: Locking thread 236, 244, 254, 266: Screw head

[0135] 240, 248, 258, 270: threaded part 250, 260, 272: anchor part

[0136] 262, 274: Anchor groove 276: Anchor protrusion

Claims

1. An intervertebral fusion cage, characterized in that: include: a first end plate and a second end plate configured to contact adjacent vertebral bodies; a distal moving block fixed to be movable relative to a plate inclined portion formed at one end of the first end plate and one end of the second end plate; a proximal moving block fixed to be movable relative to a plate inclined portion formed at the other end of the first end plate and the other end of the second end plate; an adjusting component, which is rotatably fixed to the proximal moving block and threadedly connected to the distal moving block to adjust the distance between the distal moving block and the proximal moving block; a first guide portion formed on the first end plate toward the second end plate; A second guide portion is formed on the second end plate toward the first end plate, and limits the movement direction of the first end plate and the second end plate approaching or separating from each other through sliding between the second guide portion and the first guide portion; a bone screw configured to be inserted into the bone screw holes formed in the first end plate and the second end plate; as well as a locking member configured to be fastened to the proximal movement block to prevent the bone screw from coming out, wherein the first guide portion and the second guide portion support a load in a length direction or a width direction of the first end plate and the second end plate; The locking component includes: a locking plate, which is configured to cover the bone screw; a locking bolt, which is configured to penetrate the locking plate and be fixed to the proximal moving block, and a locking bolt connecting portion is formed on the proximal moving block so that the locking bolt is connected to the front end of the adjusting component.

2. The intervertebral fusion cage according to claim 1, characterized in that: Block sliders are formed on the distal end movement block and the proximal end movement block, and a plate slider that can slide relative to the block sliders is formed on the plate inclined portion.

3. The intervertebral fusion cage according to claim 2, characterized in that: The block sliding pieces of the distal moving block are arranged on both sides of the block inclined portion corresponding to the plate inclined portion, the auxiliary block sliding pieces are arranged on the outside of the block sliding pieces, and the auxiliary plate sliding pieces corresponding to the auxiliary block sliding pieces are formed on the first end plate and the second end plate.

4. The intervertebral fusion cage according to claim 3, characterized in that: A reinforcing inclined portion is formed at a central portion of the block inclined portion, and reinforcing inclined portion seats corresponding to the reinforcing inclined portion are formed on the first end plate and the second end plate.

5. The intervertebral fusion cage according to claim 1, characterized in that: The adjusting component comprises: a threaded portion formed at one end of the adjusting component and configured to be threadedly connected to the distal moving block; and an adjusting component support surface formed at the other end of the adjusting component and capable of rotating relative to the proximal moving block at a given position.

6. The intervertebral fusion cage according to claim 1, characterized in that: The first guide portion includes a pillar protruding toward the second end plate, and the second guide portion includes an extension wall protruding toward the first end plate to be slidable relative to the pillar.

7. The intervertebral fusion cage according to claim 6, characterized in that: An accommodation portion is formed near the support column to accommodate the extension wall when the first end plate and the second end plate approach each other.

8. The intervertebral fusion cage according to claim 7, characterized in that: A guide groove is formed in the extension wall to guide the insertion of the support column.

9. The intervertebral fusion cage according to claim 7, characterized in that: A clearance cutout is formed on the extension wall to prevent interference with the bone screw.

10. The intervertebral fusion cage according to claim 1, characterized in that: A locking protrusion is formed at the rear end of the locking plate and protrudes toward the bone screw.

11. The intervertebral fusion cage according to claim 1, characterized in that: The locking bolt contacts the adjusting component and pushes the adjusting component when coupled.

12. The intervertebral fusion cage according to claim 1, characterized in that: An anchor portion without threads is formed on the distal end of the bone screw.

13. The intervertebral fusion cage according to claim 12, characterized in that: The anchor portion has an anchor groove extending in the length direction of the bone screw.

14. The intervertebral fusion cage according to claim 13, characterized in that: The anchor portion has anchor protrusions protruding in a radial shape.

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