Height-expandable spinal insertion spacer

Abstract

The present invention relates to a height-expandable spinal insertion spacer that can be inserted between vertebrae at a minimum height, allows height adjustment in the inserted state, has improved fixation force by means of bone screws inserted through endplates, and allows a single cage to replace cages having heights within a certain range. Therefore, manufacturers can reduce the number of product lines to be produced and also reduce inventory. Moreover, unlike conventional cages with predetermined heights at fixed intervals, this invention allows linear height adjustment according to the patient's intervertebral spacing, enabling surgery at the optimal height according to the patient's condition.

Description

Height-adjustable spinal insertion spacer

[0001] The present invention relates to a height-adjustable spinal fusion cage, and more particularly, to a height-expandable spinal insertion spacer that is inserted between vertebral bodies at the lowest height, can adjust the height while inserted, and has improved fixation force by a bone screw inserted through an end plate.

[0002] The vertebral column is made up of 32 to 35 vertebrae that make up the torso and the intervertebral disks between the vertebrae, and is the central part of our body that connects the skull at the top and the pelvis at the bottom.

[0003] The spine is composed of 7 cervical vertebrae, 12 thoracic vertebrae, 5 lumbar vertebrae, 5 sacral vertebrae, and 3 to 5 coccyx vertebrae from top to bottom. In adults, 5 sacral vertebrae fuse to form 1 sacrum, and 3 to 5 coccyx fuse to form 1 coccyx.

[0004] One treatment option for chronic, serious spinal conditions is spinal fusion. This surgical procedure involves removing an intervertebral disc and replacing it with a cage, fusing adjacent vertebrae together.

[0005] When performed on the lumbar spine, these spinal fusions can be categorized into posterior lumbar interbody fusion (PLIF), transformational lumbar interbody fusion (TLIF), lateral lumbar interbody fusion (LLIF), oblique lumbar interbody fusion (OLIF), and anterior lumbar interbody fusion (ALIF) depending on the insertion direction of the cage.

[0006] Posterior interbody fusion (PLIF) is a procedure in which an incision is made along the midline of the spine, the entire vertebral body is opened to expose it, a distal portion of the vertebra is removed, the disc is removed, and a PLIF cage is inserted.

[0007] Posterior interbody fusion (PLIF) is the oldest and most commonly performed spinal fusion procedure, and is essential for two- or three-body fusions. However, the surgical procedure carries a high risk of adhesions to nerves, ligaments, and muscles. The large incision area also leads to prolonged healing times. Furthermore, some individuals experience significant aftereffects.

[0008] The PLIF cage consists of a pair of small cages placed on each side, and is the smallest cage used in all spinal fusion surgeries.

[0009] Transforaminal Interbody Fusion (TLIF) is a surgical procedure in which a small incision is made along the spinal muscles on both sides to expose the vertebral body as little as possible, and the TLIF cage is inserted while removing the spinal joint area in the direction of the neural foramen. This surgical technique is suitable for single-joint surgeries because it has the advantages of less bleeding and shorter surgery time, but PLIF surgery is required when multiple areas of surgery are required. The TLIF cage is usually arc-shaped, so it is inserted into the vertebral body and rotated so that the convex part of the TLIF cage faces ventrally. The TLIF cage is larger than the PLIF cage, but its supporting surface is smaller than that of the LLIF or ALIF cage, which will be mentioned later.

[0010] Anterior interbody fusion (ALIF) offers several advantages, including a quicker recovery and no need to worry about adhesions. However, it requires a highly skilled technique, as it requires an anterior (ventral) incision, removing internal organs, and approaching the spine. The ALIF cage boasts the largest support surface area of ​​all spinal fusion cages.

[0011] Among these ALIF cages, an integrated cage having a hole for inserting and fixing a screw into the vertebral body to prevent the cage from being dislodged after the procedure has been disclosed (US2014-0277487A).

[0012] Furthermore, US9585762 and US2019-0133782A disclose self-supporting ALIF cages with adjustable heights. However, US9585762 is characterized by its height being adjusted by a vertical ratchet (302), essentially adjusting the angle rather than the height. US2019-0133782A, while height-adjustable, has a complex structure that makes it difficult to manufacture.

[0013] (Prior art literature)

[0014] (Patent Document)

[0015] (Patent Document 1) U.S. Patent Publication No. 2019-0133782 (Published on May 9, 2019)

[0016] (Patent Document 2) U.S. Patent Publication No. 2014-0277487 (Published on September 18, 2014)

[0017] The purpose of the present invention, which was devised to solve the above-described problem, is to provide a height-extendable spinal insertion spacer that can be inserted between vertebral bodies at the lowest height, can adjust the height in the inserted state, can stably support the movement of a pair of end plates, and has improved fixation force, particularly by a bone screw inserted through the end plates.

[0018] In order to achieve the above-described object, the present invention comprises: a first end plate and a second end plate that are in contact with adjacent vertebral bodies; a proximal block connected to the first end plate and the second end plate so as to be relatively movable in a proximal direction; a distal block connected to the first end plate and the second end plate so as to be relatively movable in a distal direction; an adjusting member that can adjust the distance between the proximal block and the distal block by adjusting the distance between the proximal block and the distal block by rotation; And it includes a vertical guide part formed to support a load in the longitudinal direction or the width direction of the first end plate and the second end plate by being arranged on the first end plate and the second end plate, and a proximal wedge and a distal wedge are formed at both widthwise ends of the proximal block and both widthwise ends of the distal block, respectively, and the first and second end plates have a shape that slides with respect to the proximal wedge and the distal wedge, and a proximal wing is formed between the pair of proximal wedges, and a distal wing is formed between the pair of distal wedges. It is a height-extending spinal insertion spacer characterized in that.

[0019] The above-described proximal block is characterized in that a proximal central body into which the adjusting member is inserted is formed at the center, the proximal wings extend to both sides of the proximal central body, and a proximal communication hole is formed between the inner surface of the first end plate and the inner surface of the second end plate and the proximal wings when the first end plate and the second end plate are in maximum proximity.

[0020] The thickness of the above proximal wing is characterized by being smaller than the height of the above proximal central body.

[0021] In addition, the first end plate and the second end plate are characterized in that a first proximal free portion and a second proximal free portion are formed concavely.

[0022] In addition, the adjusting member is installed so as to be rotatable by a rotation support member in a proximal adjustment member hole formed in the proximal center body, and the rotation support member is inserted and fixed into a rotation support member position formed in the proximal center body, and an installation hole communicating with the rotation support member position is formed in the first end plate or the second end plate.

[0023] In addition, the vertical guide portion is characterized by including a receiving projection portion that protrudes toward the second end plate on the first end plate and has a receiving hole formed therein, a receiving concave portion that is formed concavely on the second end plate to correspond to the receiving projection portion, and a pillar that protrudes from the receiving concave portion toward the first end plate and is inserted into the receiving hole.

[0024] In addition, the pillar is characterized in that the longitudinal length of the end plate is formed longer than the widthwise length of the end plate.

[0025] Another invention comprises: a first end plate and a second end plate that are in contact with adjacent vertebral bodies; a proximal block connected to the first end plate and the second end plate so as to be relatively movable in a proximal direction; a distal block connected to the first end plate and the second end plate so as to be relatively movable in a distal direction; an adjusting member that can adjust the distance between the proximal block and the distal block by adjusting the distance between the proximal block and the distal block by rotation; And a vertical guide portion formed to support a load in the longitudinal direction or the width direction of the first end plate and the second end plate by being disposed on the first end plate and the second end plate, a proximal wedge and a distal wedge are formed on both widthwise ends of the proximal block and both widthwise ends of the distal block, respectively, and the first and second end plates have a shape that slides with respect to the proximal wedge and the distal wedge, and the vertical guide portion includes a receiving protrusion portion on the first end plate that protrudes toward the second end plate and has a receiving hole formed therein, a receiving concave portion on the second end plate that is formed to be concave to correspond to the receiving protrusion portion, and a pillar formed to protrude from the receiving concave portion toward the receiving hole.

[0026] The present invention allows a single cage to replace cages with fixed heights within a specific range. This reduces the number of products a manufacturer must produce, reducing inventory. Furthermore, unlike conventional cages with preset heights at fixed intervals, the height of this cage is linearly adjusted based on the patient's vertebral body spacing, enabling surgery at the optimal height for each patient.

[0027] In addition, since the cage is inserted at the lowest height, the burden of having to separately produce a test insert to match the existing appropriate vertebral spacing can be reduced, and from the doctor's perspective, the effort of having to secure insertion space by sequentially inserting multiple test inserts can be reduced.

[0028] Through the present invention, since a single cage can accommodate a height within a certain range, the burden of inventory and production can be reduced, and since repetitive work during surgery can be reduced, not only can the doctor's workload be reduced, but also the surgery time can be reduced, so the amount of bleeding can be reduced, and the patient's recovery time can be significantly shortened. Therefore, it is expected that the present invention can be widely used in the relevant field.

[0029] FIG. 1 is a perspective view of the lowest height state of the height-extendable spinal insertion spacer according to the present invention.

[0030] Figure 2 is a perspective view of the height-extendable spinal insertion spacer of Figure 1 at its highest height.

[0031] Figure 3 is an exploded perspective view of the height-extending spinal insertion spacer of Figure 1 viewed from the upper front side.

[0032] Figure 4 is an exploded perspective view of the height-extending spinal insertion spacer of Figure 1 viewed from the lower front side.

[0033] FIG. 5 is a perspective view of the first end plate of the height-extendable spinal insertion spacer of FIG. 1 viewed from the upper front side.

[0034] FIG. 6 is a perspective view of the first end plate of the height-extendable spinal insertion spacer of FIG. 1 viewed from the lower front side.

[0035] FIG. 7 is a perspective view of the second end plate of the height-extendable spinal insertion spacer of FIG. 1 viewed from the upper front side.

[0036] FIG. 8 is a perspective view of the second end plate of the height-extendable spinal insertion spacer of FIG. 1 viewed from the lower front side.

[0037] FIG. 9 is a perspective view of the proximal block of the height-extending spinal insertion spacer of FIG. 1.

[0038] Figure 10 is a perspective view of the distal block of the height-extendable spinal insertion spacer of Figure 1.

[0039] FIG. 11 is a perspective view of the adjusting member of the height-extendable spinal insertion spacer of FIG. 1.

[0040] The directions used in the description below are defined. The distal direction is the direction in which the spinal interbody spacer is inserted, and the proximal direction is the opposite direction of the distal direction. The longitudinal direction refers to the direction on an imaginary straight line connecting the distal and proximal directions. The thickness direction refers to the thickness direction of the end plate, that is, the imaginary straight direction toward the upper and lower vertebrae. In addition, the width direction refers to the horizontal direction of the end plate, which is perpendicular to both the longitudinal direction and the thickness direction.

[0041] In FIGS. 1 to 4, reference numeral 100 designates a spinal interbody spacer (100) according to an embodiment of the present invention.

[0042] The above-described spinal interbody spacer (100) is largely composed of a first end plate (102) and a second end plate (104) that are arranged to face each other vertically, a distal block (108) and a proximal block (106) that are arranged between the first end plate (102) and the second end plate (104) and move according to the distance between the first end plate (102) and the second end plate (104), and an adjusting member (110) that penetrates the proximal block (106) and is connected to the distal block (108).

[0043] In addition, the spinal interbody spacer (100) includes a vertical guide portion that is formed to support a load in the longitudinal or transverse direction of the first end plate (102) and the second end plate (104) by being disposed on the first end plate (102) and the second end plate (104).

[0044] As illustrated in FIGS. 5 and 6, a first anchoring tooth (118) is formed on the surface of the first plate body (112) of the first end plate (102) that comes into contact with the vertebral body. The first anchoring tooth (118) is formed to prevent the spinal interbody spacer (100) from being dislodged from the vertebral body, and various modifications are possible.

[0045] Additionally, a first window (113) for inserting a bone graft is formed in the center of the first plate body (112). The first window (113) is connected to the internal space of the spinal interbody spacer (100).

[0046] A first proximal free portion (124) is formed in the proximal direction along the longitudinal direction of the first plate body (112), and a first distal block position (128) is formed in the distal direction. The first proximal free portion (124) is formed concavely on the inner surface of the first plate body (112) located opposite the surface in the thickness direction. In addition, a first proximal block guide (122) is formed along the longitudinal direction in the middle portion of the first proximal free portion (124). An installation hole (120) is arranged to penetrate the first proximal block guide (122).

[0047] The first proximal plate trail (126) is formed to be inclined on both sides in the width direction of the first proximal spare part (124). In addition, the first distal plate trail (130) is arranged on both sides in the width direction of the first distal block position (128).

[0048] The first proximal plate trail (126) is inclined in a distal direction from the surface toward the inner side of the first plate body (112). Conversely, the first distal plate trail (130) is inclined in a proximal direction from the surface toward the inner side of the first plate body (112).

[0049] On both sides of the width direction of the first plate body (112), a receiving protrusion (114) is formed to protrude from the inner surface of the first plate body (112). The protruding length of the receiving protrusion (114) is formed to be shorter than the thickness of the second plate body (132) of the second end plate (104). In addition, a receiving hole (116) is formed in the receiving protrusion (114).

[0050] And, as illustrated in FIGS. 7 and 8, a second anchoring tooth (138) is formed on the surface of the second plate body (132) of the second end plate (104) that comes into contact with the vertebral body. The second anchoring tooth (138) is formed to prevent the spinal interbody spacer (100) from being dislodged from the vertebral body, and various modifications are possible.

[0051] Additionally, a second window (133) for inserting a bone graft is formed in the center of the second plate body (132). The second window (133) is connected to the internal space of the spinal interbody spacer (100).

[0052] In the second plate body (132), a second proximal free portion (142) is formed in the proximal direction along the longitudinal direction, and a second distal block position (146) is formed in the distal direction. The second proximal free portion (142) is formed concavely on the inner surface of the second plate body (132) located opposite the surface in the thickness direction. In addition, a second proximal block guide (140) is formed along the longitudinal direction in the middle portion of the second proximal free portion (142).

[0053] A second proximal plate trail (144) is formed to be inclined on both sides in the width direction of the second proximal spare part (142). In addition, a second distal plate trail (148) is arranged on both sides in the width direction of the second distal block seat (146).

[0054] The second proximal plate trail (144) is inclined so as to face in a distal direction from the surface toward the inner side of the second plate body (132). Conversely, the second distal plate trail (148) is inclined so as to face in a proximal direction from the surface toward the inner side of the second plate body (132).

[0055] On both sides of the width direction of the second plate body (132), a receiving recess (136) is formed concavely from the inner surface of the second plate body (132). In addition, a pillar (134) is formed to protrude from the receiving recess (136) to be inserted into the receiving hole (116) of the receiving protrusion (114) formed in the first end plate (102). The length of the pillar (134) is formed to be equal to the sum of the depth of the receiving recess (136) and the thickness of the first end plate (102).

[0056] As illustrated in FIG. 9, the proximal block (106) comprises a proximal central body (150) located at the center, a pair of proximal wings (152) extending in the width direction from the proximal central body (150), and a proximal wedge (160) located at the end of the proximal wings (152).

[0057] A proximal adjustment member hole (158) is formed in the above-mentioned central body (150) to which the adjustment member (110) is fixed so as to be rotatable. In addition, a proximal block protrusion (154) is formed longitudinally in the proximal central body (150) toward the first end plate (102), and a rotation support member position (156) is formed in the proximal block protrusion (154).

[0058] The above-mentioned proximal block protrusion (154) slides while being inserted into the first proximal block guide (122) of the first end plate (102). In addition, the lower part of the proximal center body (150) slides while in contact with the second proximal block guide (140) of the second end plate (104). By accommodating a portion of the thickness of the proximal center body (150) in the first end plate (102) and the second end plate (104), the size of the proximal adjustment member hole (158) can be increased, and as a result, the size of the adjustment member (110) can be increased.

[0059] The thickness of the proximal wing (152) in the thickness direction is formed to be smaller than the height of the proximal center body (150) in the thickness direction. Accordingly, even when the first end plate (102) and the second end plate (104) are in maximum proximity, the proximal wing (152) is arranged at a certain distance from the first proximal free portion (124) of the first end plate (102) or the second proximal free portion (142) of the second end plate (104).

[0060] Accordingly, when viewed from the proximal direction, a proximal communication hole (192) may be formed in at least one of the space between the first proximal spare part (124) and the proximal wing (152) and the space between the second proximal spare part (142) and the proximal wing (152).

[0061] The above proximal wedge (160) is formed with a first proximal wedge rail (162) and a second proximal wedge rail (164) at the upper and lower portions. The first proximal wedge rail (162) is formed to enable sliding engagement with the first proximal plate rail (126), and the second proximal wedge rail (164) is formed to enable sliding engagement with the second proximal plate rail (144).

[0062] In addition, an installation device fastening site (166) is formed in the above proximal wedge (160) to insert the spinal interbody spacer (100) into the surgical path.

[0063] As illustrated in FIG. 10, the distal block (108) comprises a distal central body (168) located at the center, a pair of distal wings (170) extending in the width direction from the distal central body (168), and a distal wedge (174) located at the end of the distal wings (170).

[0064] A distal adjustment member groove (172) is formed in the distal center body (168) to which the adjustment member (110) is screw-fastened. In addition, a distal expansion portion (169) is formed in the thickness direction of the distal center body (168).

[0065] The above distal expansion portion (169) has a shape corresponding to the first distal block position (128) and the second distal block position (146). The first distal block position (128) and the second distal block position (146) have an open position where the distal expansion portion (169) is inserted. Accordingly, the first end plate (102) and the second end plate (104) have an approximately C-shape.

[0066] This distal expansion portion (169) is formed to prevent the insertion portions of the first end plate (102) and the second end plate (104) from becoming thinner and causing stress to be concentrated. That is, the thinned portions of the first distal block portion (128) and the second distal block portion (146) are removed, and these portions are filled with the distal expansion portion (169).

[0067] The above distal wing (170) is formed so that the cross-section increases in thickness direction from the proximal direction to the distal direction, like the above distal wedge (174).

[0068] The above distal wedge (174) is formed with a first distal wedge rail (176) and a second distal wedge rail (178) at the upper and lower portions. The first distal wedge rail (176) is formed to enable sliding engagement with the first distal plate rail (130), and the second distal wedge rail (178) is formed to enable sliding engagement with the second proximal wedge rail (164) at the second distal plate rail (148).

[0069] As illustrated in Fig. 11, the adjusting member (110) may have a shape roughly similar to a bolt. That is, the adjusting member (110) includes an adjusting member body (180) at the center, an adjusting member sliding portion (188) that is connected to one side of the adjusting member body (180) and inserted into the proximal adjusting member hole (158) to slide, an adjusting member fixing groove (186) that is connected to the adjusting member sliding portion (188) and is rotatably fixed by the rotation support member (111), an adjusting member head (182) that is formed continuously in the adjusting member fixing groove (186) and has an adjusting member tool groove (184) formed therein, and an adjusting member fastening portion (190) that is connected to the other side of the adjusting member body (180) and screw-coupled to the distal adjusting member groove (172).

[0070] Rotational force can be provided to the adjusting member (110) by fastening a tool not shown in the adjusting member fixing groove (186).

[0071] Each component of the spinal interbody spacer (100) according to an embodiment of the present invention is as described above. Next, the connection between the components and the operation of the spinal interbody spacer (100) will be described with reference to FIGS. 1 to 4.

[0072] As shown in FIGS. 3 and 4, the first end plate (102) and the second end plate (104) approach from the upper and lower sides, and the proximal block (106) and the distal block (108) approach from the proximal and distal sides, so that all rails are joined together, and the four components become one unit.

[0073] Then, the adjusting member (110) is passed through the proximal adjusting member hole (158) of the proximal block (106), and the adjusting member fastening portion (190) of the adjusting member (110) is screwed into the distal adjusting member groove (172) of the distal block (108). Next, the rotational support member (111) is inserted into the rotational support member position (156) of the proximal block (106) through the installation hole (120) of the first end plate (102). As a result, the rotational support member (111) is positioned in the adjusting member fixing groove (186), and the adjusting member (110) is fixed so as to be only rotatable with respect to the proximal block (106).

[0074] When the assembly of the above components is completed, it is supplied to the user in a state as shown in Fig. 1. In Fig. 1, the spinal interbody spacer (100) is at its lowest height, and the inner surface of the first end plate (102) and the inner surface of the second end plate (104) are in contact.

[0075] In this state, when the adjusting member (110) is rotated in one direction, the distal block (108) screw-coupled with the adjusting member (110) comes relatively close to the proximal block (106). As a result, the first end plate (102) and the second end plate (104) are mutually restrained by the rails formed in the first end plate (102), the second end plate (104), the proximal block (106), and the distal block (108), and the first end plate (102) and the second end plate (104) move away from each other. Ultimately, as illustrated in FIG. 2, the first end plate (102) and the second end plate (104) can be maximally spaced apart from each other.

[0076] At this time, the vertical guide portion restricts the movement of the first end plate (102) and the second end plate (104) so ​​that the first end plate (102) and the second end plate (104) can stably move only in the thickness direction.

[0077] The above vertical guide portion includes a receiving protrusion (114) formed on the first end plate (102), a receiving concave portion (136) formed on the second end plate (104), and a pillar (134) formed to protrude from the receiving concave portion (136).

[0078] In the state of Fig. 1, the receiving protrusion (114) and the receiving concave portion (136) are completely coupled to each other, and at this time, the pillar (134) is also inserted into the receiving hole (116) formed in the receiving protrusion (114). Looking closely at Fig. 1, the pillar (134) is exposed to the surface of the first plate body (112) from the receiving hole (116).

[0079] And, as the adjusting member (110) rotates, the proximal block (106) and the distal block (108) move closer to each other, and at the same time, the first end plate (102) and the second end plate (104) move apart from each other. At the same time, the receiving protrusion (114) and the receiving concave portion (136) begin to separate from each other. And, at the same time, the pillar (134) also begins to move from the receiving hole (116) toward the second end plate (104).

[0080] As shown in Fig. 2, even in a state where the columns (134) are spaced to the maximum extent, a part of the columns (134) is inserted into the receiving hole (116), so even if a load is applied in the longitudinal or width direction of the spinal interbody spacer (100), or a torque is applied with the thickness direction as the center of rotation, the spinal interbody spacer (100) can maintain its posture without shaking.

[0081] In addition, by forming the longitudinal length of the pillar (134) to be longer than the widthwise length, the structural strength against the shear force applied in the longitudinal direction can be further increased. Accordingly, the cross-sectional shape of the pillar (134) can be modified in various ways, such as a rectangle, an ellipse, or an ellipse.

[0082] As shown in FIG. 1, a proximal communication hole (192) is formed between the proximal wing (152) of the proximal block (106) and the first proximal free portion (124) of the first end plate (102), and between the proximal wing (152) of the proximal block (106) and the second proximal free portion (142) of the second end plate (104).

[0083] That is, the height in the thickness direction of the proximal wing (152) is formed to be smaller than the height in the thickness direction of the proximal center body (150), the first proximal free portion (124) is formed concavely on the inner surface of the first plate body (112), and the second proximal free portion (142) is formed concavely on the inner surface of the second end plate (104), so that the proximal communication hole (192) can be formed when viewed in the proximal direction even when the first end plate (102) and the second end plate (104) are in maximum proximity.

[0084] The user initially inserts the spinal interbody spacer (100) between the patient's vertebral bodies by filling the internal space of the spinal interbody spacer (100) with a bone graft through the first window (113) and the second window (133). Then, when the first end plate (102) and the second end plate (104) are separated by the adjusting member (110), the internal space of the spinal interbody spacer (100) becomes larger. As a result, a problem may arise in which the bone graft does not fill the internal space of the spinal interbody spacer (100).

[0085] In the present invention, as illustrated in FIG. 1, the proximal communication hole (192) is formed even when the first end plate (102) and the second end plate (104) are in the closest proximity. Therefore, after inserting the spinal interbody spacer (100) between the patient's vertebral bodies, it is possible to additionally inject a bone forming material through the proximal communication hole (192).

[0086] (Explanation of symbols)

[0087] 100: Spinal interbody spacer 102: First endplate

[0088] 104: Second end plate 106: Proximal block

[0089] 108: Distal block 110: Adjusting member

[0090] 111: Rotating support member 112: First plate body

[0091] 113: First window 114: Receiving protrusion

[0092] 116: Reception hole 118: First anchor tooth

[0093] 120: Installation hole 122: First proximal block guide

[0094] 124: 1st Guard Spare Part 126: 1st Guard Plate Trail

[0095] 128: 1st distal block position 130: 1st distal plate trail

[0096] 132: Second plate body 133: Second window

[0097] 134: Column 136: Receiving recess

[0098] 138: Second anchor tooth 140: Second proximal block guide

[0099] 142: 2nd Guard Spare Part 144: 2nd Guard Plate Trail

[0100] 146: Second distal block position 148: Second distal plate trail

[0101] 150: Proximal central body 152: Proximal wing

[0102] 154: Proximal block projection 156: Rotation support member location

[0103] 158: Proximal adjustment member hole 160: Proximal wedge

[0104] 162: First guard wedge rail 164; Second guard wedge rail

[0105] 166: Installation device fastening point 168: Distal center body

[0106] 169: Distal enlargement

[0107] 170: Distal wing 172: Distal adjustment member groove

[0108] 174: Distal wedge 176: First distal wedge rail

[0109] 178: Second distal wedge rail 180: Adjusting member body

[0110] 182: Adjusting member head 184: Adjusting member tool groove

[0111] 186: Adjusting member fixing groove 188: Adjusting member sliding part

[0112] 190: Adjusting member fastening part 192: Proximal communication hole

Claims

1. A first end plate and a second end plate in contact with adjacent vertebrae; A proximal block connected to the first end plate and the second end plate so as to be relatively movable in the proximal direction; A distal block connected to the first end plate and the second end plate so as to be relatively movable in the distal direction; An adjusting member that can adjust the distance between the proximal block and the distal block by adjusting the distance between the proximal block and the distal block by rotation; and A vertical guide part is formed to be disposed on the first end plate and the second end plate and to support a load in the longitudinal or transverse direction of the first end plate and the second end plate, A proximal wedge and a distal wedge are formed at both widthwise ends of the proximal block and both widthwise ends of the distal block, respectively, and the first and second end plates have a shape that slides relative to the proximal wedge and the distal wedge. A proximal wing is formed between the pair of proximal wedges, A height-extending spinal insertion spacer characterized by a distal wing formed between a pair of distal wedges.

2. In the first paragraph, a central body is formed at the center of the proximal block into which the adjusting member is inserted, The proximal wings extend to both sides of the above proximal central body, A height-extending spinal insertion spacer characterized in that a proximal communication hole is formed between the inner surface of the first end plate and the proximal wing and between the inner surface of the second end plate and the proximal wing when the first end plate and the second end plate are in maximum proximity.

3. A height-extending spinal insertion spacer, characterized in that the thickness of the proximal wing in the second paragraph is smaller than the height of the proximal center body.

4. A height-extending spinal insertion spacer, characterized in that in the second paragraph, a first proximal free portion and a second proximal free portion are formed concavely in the first end plate and the second end plate.

5. In the second paragraph, the adjusting member is installed so as to be rotatable by a rotation support member in a proximal adjusting member hole formed in the proximal central body, The above rotation support member is inserted and fixed into a rotation support member position formed in the above proximal center body, A height-extendable spinal insertion spacer characterized in that an installation hole communicating toward the rotation support member position is formed in the first end plate or the second end plate.

6. In the first paragraph, the vertical guide part, A receiving projection protruding toward the second end plate on the first end plate and having a receiving hole formed therein, A receiving recess formed concavely to correspond to the receiving protrusion on the second end plate, A height-extendable spinal insertion spacer characterized by including a pillar protruding from the above-mentioned concave portion toward the first end plate and inserted into the above-mentioned receiving hole.

7. A height-extendable spinal insertion spacer, characterized in that in the 6th paragraph, the pillar is formed such that the longitudinal length of the end plate is longer than the widthwise length of the end plate.

8. A first end plate and a second end plate in contact with adjacent vertebrae; A proximal block connected to the first end plate and the second end plate so as to be relatively movable in the proximal direction; A distal block connected to the first end plate and the second end plate so as to be relatively movable in the distal direction; An adjusting member that can adjust the distance between the proximal block and the distal block by adjusting the distance between the proximal block and the distal block by rotation; and A vertical guide part is formed to be disposed on the first end plate and the second end plate and to support a load in the longitudinal or transverse direction of the first end plate and the second end plate, A proximal wedge and a distal wedge are formed at both widthwise ends of the proximal block and both widthwise ends of the distal block, respectively, and the first and second end plates have a shape that slides relative to the proximal wedge and the distal wedge. A height-extendable spinal insertion spacer characterized in that the vertical guide portion includes a receiving projection portion that protrudes toward the second end plate on the first end plate and has a receiving hole formed therein, a receiving concave portion that is formed concavely on the second end plate to correspond to the receiving projection portion, and a pillar that is formed by protruding from the receiving concave portion toward the receiving hole.

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