A bidirectional horizontal distraction type lumbar interbody fusion cage

Abstract

The present invention relates to the field of medical devices, and in particular to a bidirectional transverse expansion type lumbar intervertebral fusion device. The present invention provides a bidirectional transverse expansion type lumbar intervertebral fusion device, comprising a fusion device body provided with an inner cavity, wherein the inner cavity is provided with a hollow first liner and a hollow second liner, one end of the first liner is slidably connected to the fusion device body and can slide along the length direction of the fusion device body, and the other end is a free end, one end of the second liner is connected to the fusion device body, and the other end is a free end. The bidirectional transverse expansion type lumbar intervertebral fusion device provided in the present application can be further extended into the interior of the vertebral body and bidirectionally expanded horizontally by a push rod after the inner liner of the fusion device is filled with bone particles, and then bone particles can be filled again through an openable and closable end cover for bone grafting, so that it can more effectively reach the deep part of the vertebral body and effectively increase the contact support area with the vertebral end plate and the effective contact area of ​​the bone grafting area.

Description

Technical Field

[0001] The invention relates to the field of medical devices, and in particular to a bidirectional transverse expansion type lumbar intervertebral fusion device. Background Art

[0002] As a common and frequently occurring disease in orthopedics, lumbar degenerative diseases (such as lumbar disc herniation, lumbar spinal stenosis, lumbar spondylolisthesis, etc.) not only cause disability and reduced quality of life in patients, but also impose a huge economic burden on families and society. For severe lumbar degenerative diseases, surgery is an important means of treatment, among which spinal canal decompression and spinal fusion are two key technologies, and the success of spinal fusion is an important guarantee of efficacy.

[0003] At present, the most widely accepted lumbar fusion technique in clinical practice is interbody fusion. Lumbar interbody fusion can be achieved through open or minimally invasive methods such as anterior (ALIF), lateral (LLIF), posterior (PLIF, TLIF) and combined approaches. Among them, posterior lumbar interbody fusion (TLIF / PLIF) is the most widely used and has a definite effect. The ultimate goal of fusion is to achieve stable healing between two or more vertebrae. Once fusion fails, it may lead to serious problems such as pseudoarthrosis, implant rupture, recurrence of low back and leg pain symptoms, and even cause medical disputes.

[0004] Intervertebral bone grafting is mainly divided into two types: direct autologous iliac bone grafting and fusion bone grafting. Autologous iliac bone grafting has many possible complications such as donor site pain, hematoma, infection, nerve damage and insufficient support strength. Since the fusion technology was pioneered in the 1980s, it has been quickly accepted and promoted by clinicians due to its advantages such as immediate support and prevention of bone graft displacement.

[0005] Therefore, although there are many factors related to poor fusion, the choice of fusion device is undoubtedly the key factor in determining whether the fusion surgery can be successful. At present, the commonly used fusion devices in clinical practice, whether square, bullet-shaped, kidney-shaped, etc., are all fixed in appearance. Due to the limitation of the intervertebral disc access in TLIF / PLIF surgery, the size of the fusion device is also strictly limited, and the actual matching with the intervertebral disc is not sufficient. As a result, the support area is insufficient, resulting in the sinking of the fusion device and the collapse of the intervertebral disc; the contact area of ​​the bone graft area is insufficient (the area of ​​the bone graft bed is usually less than 25% of the cross-sectional area of ​​the vertebral body), which affects the fusion effect and even causes complications such as loosening, displacement, and withdrawal of the fusion device, which seriously affects the clinical efficacy.

[0006] On this basis, many expandable fusion device designs have emerged, but most of them are conceptual designs and lack practical operability. Summary of the invention

[0007] In view of the above-mentioned shortcomings of the prior art, an object of the present invention is to provide a bidirectional transverse distraction lumbar intervertebral fusion cage to solve the problems in the prior art.

[0008] To achieve the above-mentioned purpose and other related purposes, the present invention provides a bidirectional transverse expansion type lumbar intervertebral fusion device, comprising a fusion device body provided with an inner cavity, the fusion device body comprising an upper vertebral contact surface and a lower vertebral contact surface, the inner cavity is respectively provided with openings on the upper vertebral contact surface, the lower vertebral contact surface and the side wall of the fusion device body, the proximal end of the fusion device body is also provided with an openable and closable end cover, a hollow first inner liner and a hollow second inner liner are provided in the inner cavity, the first inner liner and the second inner liner respectively include openings facing the upper vertebral contact surface and the lower vertebral contact surface, one end of the first inner liner is slidably connected to the fusion device body and can slide along the length direction of the fusion device body, and the other end is free end, a blocking member matched with the first inner liner is also provided in the inner cavity, when the first inner liner slides to any position except the farthest end, the blocking member acts on the first inner liner to limit its rotation, one end of the second inner liner is connected to the fusion device body, and the other end is a free end, a block is also provided on the first inner liner, and a transmission member is also provided in the inner cavity, the block can drive the first inner liner to slide, when the first inner liner slides to the farthest end, the block can also drive the first inner liner to rotate and be at least partially pushed out from the opening on the side wall of the inner cavity, when the block drives the first inner liner to move, it can simultaneously drive the second inner liner to rotate back to the first inner liner through the transmission member and be at least partially pushed out from the opening on the side wall of the inner cavity.

[0009] In some embodiments of the present invention, the transmission member is a rotor, the extension direction of the rotating shaft of the rotor is consistent with the height direction of the fusion device body, and the rotor can abut against the stopper and the second liner respectively.

[0010] In some embodiments of the present invention, the first liner and the inner cavity are provided with slide rails and slide blocks that cooperate with each other.

[0011] In some embodiments of the present invention, the shape of the distal end of the first liner matches the shape of the distal end of the fusion device body.

[0012] In some embodiments of the present invention, the shape of the fusion device body is cylindrical, the size of the fusion device body in the height direction is 8-16 mm, the size of the fusion device body in the length direction is 26-34 mm, and the size of the fusion device body in the width direction is 7-11 mm.

[0013] In some embodiments of the present invention, the shape of the first inner container is cylindrical, and the cross-sectional area of ​​the first inner container is 90 mm 2 ~120mm 2The second liner is cylindrical in shape and has a cross-sectional area of ​​50 mm. 2 ~80mm 2 .

[0014] In some embodiments of the present invention, the blocking member is a plate acting on the proximal end of the first liner, and the blocking member extends along the length direction of the fusion device body and matches the shape of the side wall of the fusion device body.

[0015] In some embodiments of the present invention, a push rod is further included, and the push rod can extend from the proximal end of the fusion device body to the stopper.

[0016] In some embodiments of the present invention, the end cover is provided with a through hole matching with the push rod, and the side wall of the push rod and the through hole are provided with threads matching with each other.

[0017] In some embodiments of the present invention, the upper vertebral body contact surface and / or the lower vertebral body contact surface are provided with locking serrations. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 Shown is a schematic diagram of the overall structure of the bidirectional transversely expanded lumbar intervertebral fusion cage provided by the present invention.

[0019] Figure 2 Shown is a schematic diagram of the inner cavity structure of the bidirectional transversely expandable lumbar intervertebral fusion cage provided by the present invention.

[0020] Figure 3 Shown is a top view of the structure of the bidirectional transversely expanded lumbar intervertebral fusion cage provided by the present invention.

[0021] Figure 4 It shows a schematic diagram of the top view of the structure of the bidirectional transversely expandable lumbar intervertebral fusion device provided by the present invention after the inner liner is pushed out.

[0022] Figure 5 It is a schematic diagram showing the use process of the bidirectional transversely distracting lumbar intervertebral fusion cage provided by the present invention.

[0023] Figure 6 It is a schematic diagram showing the use process of the bidirectional transversely distracting lumbar intervertebral fusion cage provided by the present invention.

[0024] Figure 7 It is a schematic diagram showing the use process of the bidirectional transversely distracting lumbar intervertebral fusion cage provided by the present invention.

[0025] Figure 8 It is a schematic diagram showing the use process of the bidirectional transversely distracting lumbar intervertebral fusion cage provided by the present invention.

[0026] Fig. 9It is a schematic diagram showing the use results of the bidirectional transversely distracting lumbar intervertebral fusion cage provided by the present invention.

[0027] Component number description

[0028] 1 Fusion device

[0029] 11 Inner cavity

[0030] 12 Upper vertebral contact surface

[0031] 13 Lower vertebral contact surface

[0032] 14 End cap

[0033] 141 Through Hole

[0034] 142 Buckle

[0035] 15 Slide rail

[0036] 16 Stopper

[0037] 17 Position serrations

[0038] 18 Sliders

[0039] 19 Rotation axis

[0040] 2 First liner

[0041] 21 Stopper

[0042] 3. Second liner

[0043] 4 Transmission parts

[0044] 5. Putting DETAILED DESCRIPTION

[0045] The following is a description of the implementation of the present invention by means of specific embodiments. Those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

[0046] See also Figure 1-Figure 9. It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings in this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the present invention, so they have no substantial technical significance. Any modification of the structure, change in the proportional relationship, or adjustment of the size should still fall within the scope of the technical content disclosed by the present invention without affecting the effects and purposes that can be achieved by the present invention. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" quoted in this specification are only for the convenience of description, and are not used to limit the scope of the implementation of the present invention. Changes or adjustments in their relative relationships should also be regarded as the scope of the implementation of the present invention without substantially changing the technical content.

[0047] like Figure 1 to Figure 4 As shown, the present invention provides a bidirectional transversely expanded lumbar intervertebral fusion device, comprising a device body 1 provided with an inner cavity 11, wherein the device body 1 comprises an upper vertebral contact surface 12 and a lower vertebral contact surface 13, wherein the inner cavity 11 is respectively provided with openings on the upper vertebral contact surface 12, the lower vertebral contact surface 13 and the side wall of the device body 1, wherein the proximal end (i.e., a side surface with a smaller area) of the device body 1 is further provided with an openable and closable end cover 14, wherein a hollow first liner 2 and a hollow second liner 3 are provided in the inner cavity 11, wherein the first liner 2 and the second liner 3 respectively comprise openings facing the upper vertebral contact surface 12 and the lower vertebral contact surface 13, wherein one end of the first liner 2 is slidably connected to the device body 1 and can be moved along the fusion The length direction of the fusion device body 1 (the height direction of the fusion device body 1 is usually consistent with the extension direction of the fusion device body 1 from the upper vertebral contact surface 12 to the lower vertebral contact surface 13, and its length direction usually refers to a relatively long dimension direction on the cross section of the fusion device body 1) slides, and the other end is a free end, and the inner cavity 11 is also provided with a blocking member 16 that cooperates with the first inner liner 2. When the first inner liner 2 slides to other positions except the farthest end, the blocking member 16 acts on the first inner liner 2 to limit its rotation. One end of the second inner liner 3 is connected to the fusion device body 1, and the other end is a free end. The first inner liner 2 is also provided with a block 21, and the inner cavity 11 is also provided with a transmission member 4. The block 21 can drive the first inner liner 2 When the first liner 2 slides to the farthest end, the stopper 21 can also drive the first liner 2 to rotate and be at least partially pushed out from the opening on the side wall of the inner cavity 11. When the stopper 21 drives the first liner 2 to move, it can simultaneously drive the second liner 3 to rotate away from the first liner 2 through the transmission member 4 and be at least partially pushed out from the opening on the side wall of the inner cavity 11. When the bidirectional horizontal expansion intervertebral fusion device provided in the present application is used, bone fragments can be implanted in the first liner 2 and the second liner 3, and then the intervertebral fusion device can be knocked into the intervertebral space. Then, as Figure 5As shown, a push rod or other device can be used to push the stopper 21, so that the stopper 21 drives the first inner liner 2 to extend forward a certain distance along the length direction of the intervertebral fusion device, and when reaching the end of the slide rail, the stopper 21 can cooperate with the transmission member 4 to drive the first inner liner 2 and the second inner liner 3 to rotate in opposite directions, so that the two inner liner are pushed outward at two opposite sides of the intervertebral fusion device respectively, and after the first inner liner 2 and the second inner liner 3 are pushed out, as shown in FIG. Figure 6 As shown, the inner space of the inner cavity 11 can be exposed through the openable end cover 14, and then Figure 7 As shown in FIG. 1 , the bone fragments can be implanted into the inner cavity 11 of the fusion device body 1 again, and the end cover 14 is covered as shown in FIG. Figure 8 The operation can be completed as shown. Fig. 9 As shown, the contact support area between the fusion device and the end plate can be increased, and the effective contact area of ​​the bone graft area can be increased.

[0048] In the bidirectional horizontal expansion type lumbar intervertebral fusion device provided by the present invention, a person skilled in the art can select a suitable transmission member 4, so that when the stopper 21 drives the first inner liner 2 to rotate, the second inner liner 3 can be driven to rotate back to the first inner liner 2 through the transmission member 4 at the same time. For example, the transmission member 4 can be a rotor, and the rotor can rotate along the shaft, and the extension direction of the shaft can be consistent with the height direction of the fusion device body 1, and the rotor can abut against the stopper 21 and the second inner liner 3 respectively. For another example, when the stopper 21 does not slide to the farthest end of the first inner liner 2, the transmission member 4 does not transmit, that is, the transmission member 4 can maintain a certain distance from the stopper 21 or the second inner liner 3, so that the first inner liner 2 can extend to a position further inside the vertebral body, and when sliding to the farthest end, the transmission member 4 can abut against the stopper 21 and the second inner liner 3 respectively, so that the first inner liner 2 and the second inner liner 3 rotate back to each other at the same time.

[0049] In the bidirectional transverse expansion type lumbar intervertebral fusion device provided in the present application, the device body 1 can generally include an upper vertebral contact surface 12 and a lower vertebral contact surface 13, which mainly play a supporting role for the intervertebral fusion device as a whole, and can further provide a certain space for accommodating bone fragments after the first liner 2 and the second liner 3 are laterally pushed out of the inner cavity 11, so as to expand the contact area of ​​the fusion device. The upper vertebral contact surface 12 and the lower vertebral contact surface 13 are generally provided with openings of appropriate sizes, so that the bone fragments implanted in the fusion device body 1 later can form appropriate contact with the upper and lower vertebrae. The openings on the side walls of the fusion device body 1 are mainly used for the lateral expansion of the first liner 2 and the second liner 3, and their sizes are generally matched with the sizes of the first liner 2 and the second liner 3. The size of the fusion device body 1 is usually matched with the interval between the vertebrae and the area of ​​the vertebrae to be contacted therewith. For example, the shape of the fusion device body 1 can be usually cylindrical, and the upper vertebrae contact surface 12 and the lower vertebrae contact surface 13 correspond to the upper and lower surfaces of the cylinder respectively; for another example, the size of the fusion device body 1 in the height direction (consistent with the extension direction of the upper and lower vertebrae) can be 8-16mm, 8-10mm, 10-12mm, 12-14mm, or 14-16mm, and the size of the fusion device body 1 in the length direction can be 26-34mm, 26-35mm, 26-40mm, 26-50mm, 26-60mm, 26-70mm, 26-80mm, 26-90mm, 26-100mm, 26-110mm, 26-120mm, 26-130mm, 26-140mm, 26-150mm, 26-160mm, 26-170mm, 26-180mm, 26-250mm, 26-260mm, 26-35 ... 26-28mm, 28-30mm, 30-32mm, or 32-34mm, and the size of the fusion device body 1 in the width direction can be 9-11mm, 9-10mm, or 10-11mm; for another example, the opening on the upper vertebral contact surface 12 can be substantially consistent with the area of ​​the upper surface of the column, and the opening on the lower vertebral contact surface 13 can be substantially consistent with the area of ​​the lower surface of the column, so as to maximize the contact area between the broken bones in the inner cavity 11 and the upper and lower vertebral bodies; for another example, in the width direction of the fusion device body 1, openings (usually two opposite side walls with larger areas) can be generally provided on the two opposite side walls of the fusion device body 1, so that the first liner 2 and the second liner 3 can be laterally expanded relative to each other.

[0050] In the bidirectional transverse distraction type lumbar intervertebral fusion device provided in the present application, in the device body 1, the upper vertebral contact surface 12 and / or the lower vertebral contact surface 13 are also provided with a locking sawtooth 17, and the locking sawtooth 17 is mainly used to prevent the fusion device from slipping back. The position of the locking sawtooth 17 and the opening position on the upper vertebral contact surface 12 and the lower vertebral contact surface 13 can usually be matched. For example, the locking sawtooth 17 can be located at the edge of the opening on the upper vertebral contact surface 12, and the locking sawtooth 17 can also be located at the edge of the opening on the lower vertebral contact surface 13.

[0051] In the bidirectional transversely expandable lumbar intervertebral fusion device provided by the present application, the first inner liner 2 is mainly used to provide a certain space for accommodating bone fragments, and can be pushed out of the fusion device body 1 after sliding a distance along the length direction of the intervertebral fusion device, facing away from the second inner liner 3, and expanding the contact area of ​​the fusion device while reaching the inner part of the vertebral body. The proximal end of the first inner liner 2 can be slidably connected with the fusion device body 1. When the stopper 21 on the first inner liner 2 is pushed, due to the existence of the blocking member 16, the first inner liner 2 will not rotate during the sliding process from the proximal end to the distal end. When the first inner liner 2 slides to the farthest end, the blocking member 16 no longer acts on the first inner liner 2, and the distal end of the first inner liner 2 can rotate outward, thereby expanding laterally (corresponding to the width direction of the fusion device body 1). The sliding distance of the first inner liner 2 can be adjusted by those skilled in the art. For example, the sliding distance of the first inner liner 2 in the length direction can usually be 3mm to 6mm, 3mm to 4mm, 4mm to 5mm, or 5mm to 6mm. The first inner liner 2 and the inner cavity 11 are provided with a slide rail 15 and a slider 18 that cooperate with each other, so that the first inner liner 2 can slide, and when the first inner liner 2 slides to the farthest end, the slider 18 can be used as a rotating axis to rotate outward. The first inner liner 2 can include openings of appropriate size facing the upper vertebral contact surface 12 and the lower vertebral contact surface 13. Bone fragments are first implanted into the inner liner before implantation into the intervertebral space, and the bone fragments implanted in the first inner liner 2 can form appropriate contact with the upper and lower vertebral bodies. When the first inner liner 2 is not deployed, it can usually occupy part of the space in the inner cavity 11 of the fusion device body 1, and the shape of its distal end is usually matched with the shape of the distal end of the fusion device body 1 (for example, it can be basically consistent), so that the inner liner can be further extended to the inner side of the vertebral body. For example, the shape of the first liner 2 can be generally cylindrical, and its extension direction is consistent with the extension direction of the fusion device body 1 in the height direction, and the upper and lower surfaces of the column face the upper vertebral contact surface 12 and the lower vertebral contact surface 13 respectively; for another example, the size of the first liner 2 in the height direction can be 6-14mm, 6-8mm, 8-10mm, 10-12mm, or 12-14mm, and the cross-sectional area of ​​the first liner 2 can be 90mm 2 ~120mm 2 、90mm 2 ~100mm 2 , 100mm 2 ~110mm 2 , or 110mm 2 ~120mm 2For another example, the opening of the first liner 2 toward the upper vertebral contact surface 12 may be substantially consistent with the area of ​​the upper surface of the column, and the opening of the first liner 2 toward the lower vertebral contact surface 13 may be substantially consistent with the area of ​​the lower surface of the column.

[0052] In the bidirectional transversely expandable lumbar intervertebral fusion device provided by the present application, the blocking member 16 may be a component acting on the first inner liner 2, which may be generally arranged parallel to the sliding direction of the first inner liner 2. For example, the blocking member 16 may be a plate acting on the side wall in the length direction of the first inner liner, and may specifically act on the proximal end of the first inner liner 2. It may extend along the length direction of the fusion device body 1, may be located on the outside of the first inner liner 2, or may be located on the inside of the first inner liner 2, and may form an integral structure with the slider 18. The shape of the blocking member 16 may generally match the shape of the first inner liner 2 and the side wall of the fusion device body 1, so that when the first inner liner 2 slides toward the distal end, the blocking member 16 may simultaneously seal the position left by the movement of the first inner liner 2, so that the inner cavity 11 remains relatively closed.

[0053] In the bidirectional transversely expandable lumbar intervertebral fusion device provided by the present application, the second liner 3 is mainly used to provide a certain space for accommodating bone fragments, and can be pushed out of the fusion device body 1 with the back of the first liner 2, thereby expanding the contact area of ​​the fusion device. The distal end of the second liner 3 can be connected to the fusion device body 1. When the transmission member 4 is pushed by the block 21 and acts on the second liner 3, the proximal end of the second liner 3 can be rotated outward, thereby expanding laterally (corresponding to the width direction of the fusion device body 1). For example, a rotating shaft 19 can be provided in the inner cavity 11, and the distal end (non-free end) of the second liner 3 can be rotated outward around the rotating shaft 19. The second liner 3 may include an opening of suitable size facing the upper vertebral contact surface 12 and the lower vertebral contact surface 13. The bone fragments are first implanted into the liner before implantation into the intervertebral space, and the bone fragments implanted in the second liner 3 can form suitable contact with the upper and lower vertebral bodies. The second liner 3 can usually occupy part of the space in the inner cavity 11 of the fusion device body 1 when not deployed. For example, the shape of the second liner 3 can usually be cylindrical, and its extension direction is consistent with the extension direction of the fusion device body 1, and the upper and lower surfaces of the cylinder are respectively facing the upper vertebral contact surface 12 and the lower vertebral contact surface 13; for another example, the size of the second liner 3 in the height direction can be 6-14mm, 6-8mm, 8-10mm, 10-12mm, or 12-14mm, and the cross-sectional area of ​​the second liner 3 can be 50mm 2 ~80mm 2 , 50mm 2 ~60mm 2 、60mm 2 ~70mm2 , or 70mm 2 ~80mm 2 For another example, the opening of the second liner 3 toward the upper vertebral contact surface 12 may be substantially consistent with the area of ​​the upper surface of the column, and the opening of the second liner 3 toward the lower vertebral contact surface 13 may be substantially consistent with the area of ​​the lower surface of the column.

[0054] The bidirectional horizontal expansion type lumbar intervertebral fusion device provided in the present application may also include a push rod 5, which can extend from the proximal end of the fusion device body 1 to the stopper 21, so that the stopper 21 can be pushed when needed and the first liner 2 can be driven to move. The end cover 14 may be provided with a through hole 141 that matches the push rod 5, and the side wall of the push rod 5 and the through hole 141 are provided with mutually matching threads (for example, the side wall of the push rod 5 may be provided with threads, and the through hole 141 may be a screw hole), so that the push rod 5 can have a certain force point when it is pushed toward the stopper 21 through the end cover 14, forming a good directional support to ensure the overall stability of the device, and after the pushing is completed, the end cover 14 threadedly connected thereto can be directly removed together, so as to open the proximal end of the fusion device body 1, and then the bone fragments can be implanted into the inner cavity 11 of the fusion device body 1 again.

[0055] The bidirectionally laterally expandable expansion-type lumbar intervertebral fusion device provided in the present application can be filled with bone particles in the inner liner of the fusion device, and then the device can be further extended into the vertebral body and expanded horizontally in both directions through a push rod. Subsequently, the bone particles can be refilled through the openable and closable end covers for bone grafting, thereby more effectively reaching the deep part of the vertebral body and effectively increasing the contact support area with the vertebral end plate and the effective contact area of ​​the bone grafting area, thereby effectively reducing local stress and reducing fusion device settlement, and effectively preventing fusion device withdrawal, thereby increasing initial stability and improving fusion quality, greatly improving clinical efficacy, reducing complications, and having good industrial prospects.

[0056] In summary, the present invention effectively overcomes various shortcomings of the prior art and has high industrial utilization value.

[0057] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed by the present invention shall still be covered by the claims of the present invention.

Claims

1. A bidirectional horizontal expansion type lumbar intervertebral fusion cage, characterized in that: The invention comprises a fusion device body (1) provided with an inner cavity (11), the fusion device body (1) comprising an upper vertebral body contact surface (12) and a lower vertebral body contact surface (13), the inner cavity (11) respectively comprising openings on the upper vertebral body contact surface (12), the lower vertebral body contact surface (13) and the side wall of the fusion device body (1), the proximal end of the fusion device body (1) is also provided with an openable and closable end cover (14), the inner cavity (11) is provided with a hollow first liner (2) and a hollow second liner (3), the first liner (2) and the second liner (3) respectively comprising openings facing the upper vertebral body contact surface (12) and the lower vertebral body contact surface (13), one end of the first liner (2) is slidably connected to the fusion device body (1) and can slide along the length direction of the fusion device body (1), and the other end is a free end, the inner cavity (11) is also provided with a first liner (2) and a second liner (3) connected to the first liner ( 2) a matching blocking member (16), when the first inner liner (2) slides to a position other than the farthest end, the blocking member (16) acts on the first inner liner (2) to limit its rotation, one end of the second inner liner (3) is connected to the fusion device body (1) and the other end is a free end, the first inner liner (2) is also provided with a blocking block (21), the inner cavity (11) is also provided with a transmission member (4), the blocking block (21) drives the first inner liner (2) to slide, when the first inner liner (2) slides to the farthest end, the blocking block (21) also drives the first inner liner (2) to rotate and be at least partially pushed out from the opening on the side wall of the inner cavity (11), when the blocking block (21) drives the first inner liner (2) to move, it also drives the second inner liner (3) to rotate away from the first inner liner (2) through the transmission member (4) and be at least partially pushed out from the opening on the side wall of the inner cavity (11); The transmission member (4) is a rotor, the extension direction of the rotation axis of the rotor is consistent with the height direction of the fusion device body (1), and the rotor is respectively in contact with the stopper (21) and the second liner (3); The first liner (2) and the inner cavity (11) are provided with a slide rail (15) and a slide block (18) that cooperate with each other; The bidirectional transverse distraction-type lumbar intervertebral fusion device comprises a push rod (5), wherein the push rod (5) extends from the proximal end of the fusion device body (1) to a stopper (21).

2. The intervertebral fusion cage according to claim 1, characterized in that: The shape of the distal end of the first liner (2) matches the shape of the distal end of the fusion device body (1).

3. The intervertebral fusion cage according to claim 1, characterized in that: The shape of the fusion device body (1) is cylindrical, the dimension of the fusion device body (1) in the height direction is 8-16 mm, the dimension of the fusion device body (1) in the length direction is 26-34 mm, and the dimension of the fusion device body (1) in the width direction is 7-11 mm.

4. The intervertebral fusion cage according to claim 1, characterized in that: The first inner liner (2) is cylindrical in shape, and the cross-sectional area of ​​the first inner liner (2) is 90 mm² to 120 mm²; the second inner liner (3) is cylindrical in shape, and the cross-sectional area of ​​the second inner liner (3) is 50 mm² to 80 mm².

5. The intervertebral fusion cage according to claim 1, characterized in that: The blocking member (16) is a plate body acting on the proximal end of the first liner (2); the blocking member (16) extends along the length direction of the fusion device body (1) and matches the shape of the side wall of the fusion device body (1).

6. The intervertebral fusion cage according to claim 1, characterized in that: The end cover (14) is provided with a through hole (141) that matches the push rod (5), and the side wall of the push rod (5) and the through hole (141) are provided with threads that match each other.

7. The intervertebral fusion cage according to claim 1, characterized in that: The upper vertebral body contact surface (12) and / or the lower vertebral body contact surface (13) are provided with locking saw teeth (17).

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