An angle-expandable intervertebral fusion cage and its spinal implant system

Abstract

The present invention discloses an angle-expandable intervertebral fusion device and a spinal implant system. The fusion device includes: a main body; an upper support plate disposed on the upper part of the main body and rotatably connected to the main body; a lower support plate disposed on the lower part of the main body and rotatably connected to the main body; a spreading push block located between the upper support plate and the lower support plate, and the spreading push block is located within the main body; a screw, one end of the screw is threadedly connected to the spreading push block, and the other end is located at the distal end of the main body; a screw locking member disposed at the distal end of the main body, the material of the screw locking member is an elastic material, and the cross-section of the portion where the screw cooperates with the screw locking member is polygonal for restricting the self-rotation of the screw; an external tool rotates the screw to move the spreading push block within the main body towards the distal end or towards the proximal end, so as to increase or decrease the angle between the upper support plate and the lower support plate. The fusion device of the present invention is provided with a screw locking member to ensure that when no external force acts on the screw, the screw does not rotate by itself and the expansion angle of the fusion device remains unchanged.

Description

Technical Field

[0001] The invention belongs to the field of spinal implants, and in particular relates to an intervertebral fusion device capable of expanding an angle. Background Art

[0002] Spinal fusion is a basic technique for treating spinal diseases, which is used to establish and maintain spinal stability. Interbody fusion is the ideal procedure in spinal fusion that conforms to spinal biomechanics, and fusion cage is a commonly used instrument for interbody fusion.

[0003] With the development of minimally invasive surgical techniques, traditional intervertebral fusion devices can no longer meet the needs of minimally invasive surgery. The premise of minimally invasive intervertebral fusion is to establish a working channel through a minimally invasive approach and obtain a fusion rate that is not lower than that of open surgery while minimizing the damage to the surrounding tissues. In order to overcome the problem that the traditional fusion device is too large to pass through the minimally invasive channel for lumbar intervertebral fusion, especially for the intervertebral angle between L4 and L5 and L5 and sacrum is 10° to 20°, and the muscles and nerves are strained during the operation when the traditional fusion device is implanted, resulting in postoperative lumbar muscle pain, dysfunction and other problems. The angle-expandable intervertebral fusion device is a new type of intervertebral fusion device used to assist minimally invasive surgical techniques in recent years. It is small in size and in a contracted state when implanted. After expansion, it can restore the angle of the intervertebral space, thereby restoring the physiological curve of the spine.

[0004] However, after the fusion device is implanted in the lumbar intervertebral disc and the patient resumes normal activities, the implant will be subjected to forces and strains that will cause the screw to withdraw, resulting in contraction of the fusion device and a decrease in the distraction angle. Summary of the invention

[0005] In view of the above technical problems, the present invention provides an intervertebral fusion device with an expandable angle. The intervertebral fusion device of the present invention has an integrated screw locking piece. When the thread has a self-locking ability, a screw locking piece is also provided to ensure that the screw will not rotate on its own when no external force acts on the screw, thereby ensuring that the expansion angle of the fusion device remains unchanged.

[0006] To achieve the above object, the technical solution of the present invention is:

[0007] An angle to expand the interbody fusion cage includes:

[0008] A main body, comprising a proximal end and a distal end, wherein the proximal end of the main body is an end close to an operator, and the distal end is an end away from the operator;

[0009] An upper support plate, disposed on the upper portion of the main body and rotatably connected to the main body;

[0010] A lower support plate, disposed at the lower part of the main body and rotatably connected to the main body;

[0011] The spreading push block is located between the upper support plate and the lower support plate. The spreading push block is located within the main body and is movable within the main body;

[0012] A screw, one end of the screw is threadedly connected to the spreading push block, and the other end is located at the distal end of the main body;

[0013] A screw locking member is provided at the distal end of the main body. The screw locking member is fitted with the screw. The cross-section of the portion where the screw mates with the screw locking member is polygonal, and the portion where the screw locking member mates with the screw has elastic deformation to limit the self-rotation of the screw. Only when the force applied by the surgeon to the screw during the implantation process increases is it sufficient to cause the screw to rotate;

[0014] An external tool rotates the screw to move the spreading push block within the main body towards the distal end or towards the proximal end, so as to increase or decrease the angle between the upper support plate and the lower support plate, and to spread away from the main body or close towards the main body.

[0015] The bottom of the contact portion between the screw locking member and the screw is a limiting arc surface for supporting the screw.

[0016] On both sides of the contact portion between the screw locking member and the screw, first grooves are respectively opened on the sides away from the screw. When the screw rotates, the first grooves provide space for the screw locking member to spring open.

[0017] On the screw locking member, second grooves are opened at both ends of the limiting arc surface. When the screw rotates, both sides of the screw locking member can spring open more easily.

[0018] A card slot is opened at the distal end of the main body, and the screw locking member is inserted into the card slot.

[0019] The upper part of the contact portion between the screw locking member and the screw extends away from the screw, and a first step is provided at the extended end. Correspondingly, a second step is provided in the card slot, and the first step is clamped on the second step to prevent the screw locking member from falling out of the card slot.

[0020] The spreading push block includes a push block body, and inclined surfaces for spreading the upper support plate and the lower support plate are provided on both the upper and lower surfaces of the push block body.

[0021] Since the upper support plate and the lower support plate are rotatably connected to the main body, the upper support plate and the lower support plate can easily rotate relative to the main body. Therefore, a wedge surface for preventing the upper and lower support plates from rotating by themselves is provided on the push block body. The two sides of the push block body extend towards the proximal end of the main body, and a wedge surface is provided at the extended end. Correspondingly, flanges are provided at the portions of the upper support plate and the lower support plate that cooperate with the wedge surface. The wedge surface cooperates with the flanges to prevent the upper support plate and the lower support plate from rotating relative to the main body by themselves.

[0022] The upper support plate and the lower support plate are rotatably connected to the main body through a pin shaft.

[0023] One end of the pin shaft is provided with a riveting edge. After the pin shaft is installed, the riveting edge is turned outwards to prevent the pin shaft from falling off.

[0024] Arc surfaces that cooperate with the inclined surface are provided on both the upper support plate and the lower support plate, facilitating the movement of the upper support plate and the lower support plate along the inclined surface of the push block body.

[0025] The distal ends of the upper support plate and the lower support plate are both wedge-shaped. The distal ends of the upper support plate and the lower support plate are the first to be inserted into the intervertebral disc space. Designing this end into a wedge shape makes it easier for the fusion device to be inserted into the intervertebral disc space of patients with intervertebral disc diseases, while minimizing damage to the surrounding anatomical structures.

[0026] Anti-slip grooves are provided on the bone contact surfaces of the upper support plate and the lower support plate. The anti-slip grooves can be in the form of teeth to prevent the fusion device from sliding after being implanted into the intervertebral space.

[0027] Reinforcing ribs are provided on the contact surfaces between the upper support plate, the lower support plate and the main body to enhance the compressive strength of the support plates.

[0028] The distal end of the main body is bullet-shaped. The distal end of the main body is also the first to be inserted into the intervertebral disc space. Designing this end into a bullet shape makes it easier for the fusion device to be inserted into the intervertebral disc space of patients with intervertebral disc diseases, while minimizing damage to the surrounding anatomical structures.

[0029] A clamping groove for external instrument clamping is provided at the proximal end of the main body.

[0030] Support surfaces that contact the adjacent vertebrae are respectively provided on the upper and lower surfaces of the proximal end of the main body, and are also used to support the upper support plate and the lower support plate. The support surfaces are preferably inclined surfaces that form an angle of 5 - 10 degrees with the horizontal plane.

[0031] The angle at which the fusion device can be expanded is 0° - 20°, and it is gradually expanded to an oblique lordosis or lordosis angle of 20° according to the clinical needs of the patient.

[0032] The present invention also provides an angle-expandable intervertebral fusion device suitable for TLIF surgery, including the above-mentioned angle-expandable intervertebral fusion device, because the upper and lower support plates are rotatably connected to the main body around the pin shaft, the center line of the pin shaft is kept parallel to the coronal plane of the vertebral body, ensuring that the upper support plate and the lower support plate are in contact with the adjacent vertebral bodies, the proximal end face of the fusion device is inclined with the pin shaft, the push block body, and the main body, and the proximal end face of the fusion device is parallel to the axis of the pin shaft.

[0033] The angle formed by the proximal end surface of the fusion device and the proximal side surface is 50° to 60°.

[0034] Due to the adoption of the above technical solution, the present invention has the following advantages and positive effects compared with the prior art:

[0035] The intervertebral fusion device of the present invention is provided with a screw and a screw locking piece, the screw is threadedly connected with the expansion push block, and a screw locking piece is provided at the distal end of the main body to cooperate with the screw when the thread itself has a self-locking ability, and the cross section of the screw cooperation position is set to a polygon, so that the screw can only be rotated when the force applied to the screw by the surgeon during the implantation process is increased enough to overcome the edges of the polygonal surface, and the upper and lower support plates of the fusion device will shrink or expand, and the screw will not rotate when there is no external force. Therefore, the screw locking piece ensures that the screw will not rotate by itself when there is no external force acting on the screw, thereby ensuring that after the fusion device is implanted in the patient's body, the normal activities of the patient will not cause the expansion angle to remain unchanged, thereby extending the service life of the fusion device in the patient's body.

[0036] The fusion device of the present invention can be gradually expanded to an oblique lordosis or lordosis angle of 20 degrees according to the needs of the patient. The surgeon does not need to repeatedly insert the trial model into the intervertebral space, which reduces the damage to the surrounding anatomical structure and shortens the operation time. There is no need to expand the adjacent vertebrae too high, which reduces excessive traction on the muscles, nerves and dura mater sac during the implantation of traditional fusion devices, leading to postoperative lumbar muscle pain, dysfunction and other problems. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 This is a schematic diagram of the three-dimensional structure of the fusion device according to Example 1 of the present invention;

[0038] Figure 2 is a top view of the fusion device according to Example 1 of the present invention;

[0039] Figure 3 It is a front view of the fusion device of Example 1 of the present invention;

[0040] Figure 4 This is an exploded view of the fusion device according to Example 1 of the present invention;

[0041] Figure 5a The structure of the main body of the fusion device of Example 1 of the present inventionFigure 1 ;

[0042] Figure 5b It is the structure of the main body of the fusion device in Embodiment 1 of the present invention Figure 2 ;

[0043] Figure 6a It is the structure of the upper support plate of the fusion device in Embodiment 1 of the present invention Figure 1 ;

[0044] Figure 6b It is the structure of the upper support plate of the fusion device in Embodiment 1 of the present invention Figure 2 ;

[0045] Figure 7 It is the structure diagram of the spreading push block of the fusion device in Embodiment 1 of the present invention;

[0046] Figure 8 It is the structure diagram of the screw rod of the fusion device in Embodiment 1 of the present invention;

[0047] Figure 9 It is the structure diagram of the screw rod locking part of the fusion device in Embodiment 1 of the present invention;

[0048] Figure 10 It is the structure diagram of the pin shaft of the fusion device in Embodiment 1 of the present invention;

[0049] Figure 11 It is the structure diagram of the cooperation between the main body of the fusion device and the spreading push block in Embodiment 1 of the present invention;

[0050] Figure 12 It is Figure 2 the structure diagram of the A - A section in

[0051] Figure 13 It is Figure 3 the structure diagram of the B - B section in

[0052] Figure 14 It is the three - dimensional structure schematic diagram of the fusion device in Embodiment 2 of the present invention;

[0053] Figure 15 It is the schematic diagram of the main body structure of the fusion device in Embodiment 2 of the present invention;

[0054] Figure 16 It is the schematic diagram of the structure of the spreading push block of the fusion device in Embodiment 2 of the present invention;

[0055] Figure 17 It is the schematic diagram of the structure of the cooperation between the main body and the spreading push block of the fusion device applicable to TLIF in Embodiment of the present invention.

[0056] Description of the reference numerals: 1 - main body; 101 - supporting surface; 102 - screw hole; 103 - clamping groove; 1031 - second step; 104 - third step; 105 - instrument clamping groove; 106 - embedded tool hole; 107 - horizontal plane or nearly horizontal plane; 108 - proximal end face; 109 - proximal side; 1010 - arc-shaped; 1011 - bullet-shaped; 2 - upper support plate; 201 - bone contact surface; 202 - main body contact surface; 203 - anti-movement groove; 204 - embedded tool groove; 205 - arc surface; 206 - flange; 207 - reinforcing rib; 208 - wedge shape; 3 - lower support plate; 4 - spreading push block; 401 - push block body; 402 - inclined surface; 403 - wedge surface; 404 - threaded hole; 5 - screw; 501 - thread; 502 - socket; 503 - polygon; 6 - screw locking member; 601 - limiting arc surface; 602 - first groove; 603 - second groove; 604 - first step; 7 - pin shaft; 701 - fourth step; 702 - riveting edge; 8 - pin hole; 801 - fifth step; 9 - hollow in the middle. Detailed implementation manners

[0057] The following further describes in detail an angle-expandable intervertebral fusion device proposed by the present invention in combination with the accompanying drawings and specific embodiments. According to the following description, the advantages and features of the present invention will be clearer.

[0058] The professional term "proximal end" refers to the end close to the operator, and the "distal end" refers to the end far from the operator.

[0059] Embodiment 1

[0060] Refer to Figure 1-13 , an angle-expandable intervertebral fusion device, comprising: a main body 1, an upper support plate 2, a lower support plate 3, and a spreading push block 4 located between the upper support plate 2 and the lower support plate 3 and inside the main body 1, as well as a screw 5 and a screw locking member 6. The upper support plate 2 and the lower support plate 3 are respectively rotatably connected to the main body 1. The spreading push block 4 can move inside the main body 1. The proximal end of the screw 5 is threadedly connected to the spreading push block 4. An external tool acts on the proximal end of the screw 5, and the screw 5 rotates, causing the spreading push block 4 to move towards the distal end or the proximal end inside the main body 1, so as to increase or decrease the angle between the upper support plate 2 and the lower support plate 3, and the upper support plate 2 and the lower support plate 3 spread away from the main body 1 or close towards the main body 1. The fusion device is implanted into the lumbar intervertebral space in a closed state, and an external tool acts on the screw 5 to push the upper support plate 2 and the lower support plate 3 until the appropriate intervertebral space angle is reached, so that it is not necessary to first expand the adjacent vertebral bodies by a large gap before implanting the fusion device, and it is not necessary to repeatedly try the mold and insert it into the intervertebral space. The fusion device is implanted into the intervertebral space and adjusted to the desired intervertebral space angle. The distal height of the fusion device is greater than the proximal height of the fusion device, thereby restoring a more natural lordotic curvature of a specific segment of the lumbar spine.

[0061] As Figure 5a , 5b shown, the main body 1 has a hollowed-out middle part 9, which is used to place the spreading push block 4, the screw 5, etc., and is also used for implanting bone fillers and fusing with the vertebral body. The bone fillers can be commonly used bone filling materials such as autologous bone, allogeneic bone, artificial bone, etc. The shape of the hollowed-out middle part 9 of the main body 1 can be designed as a rectangle or a square, etc. Of course, the shape of the main body 1 can also be set to other shapes other than a rectangle or a square. The upper and lower surfaces of the proximal end of the main body 1 are set as the supporting surfaces 101 in contact with the adjacent vertebral bodies. The supporting surfaces 101 support the proximal ends of the upper supporting plate 2 and the lower supporting plate 3. The supporting surfaces 101 are preferably inclined surfaces at an angle of 5-10 degrees to the horizontal plane and are inclined in the direction towards the proximal end.

[0062] The distal end of the main body 1 is designed as a bullet head shape 1011 to help the fusion device insert into the collapsed disc space of patients with degenerative disc disease while minimizing damage to the surrounding anatomical structures. A clamping groove 103 is opened at the distal end of the main body 1. The screw locking member 6 is embedded in the clamping groove 103 and cooperates with the screw 5. Therefore, a screw hole 102 is opened on the main body 1. The end of the screw 5 passes through the screw hole 102 and cooperates with the screw locking member 6. The upper and lower surfaces of the proximal end of the main body 1 are respectively provided with supporting surfaces 101. The upper and lower surfaces near the distal end of the main body 1 are horizontal planes or nearly horizontal planes 107. The horizontal planes or nearly horizontal planes 107 are connected to the supporting surfaces 101 through the third step 104 to ensure that when the fusion device is in the retracted state, the upper supporting plate 2 and the lower supporting plate 3 of the fusion device are arranged in parallel. External tool clamping grooves 105 are provided on both sides of the proximal end of the main body 1. External tools are clamped in the tool clamping grooves 105 to implant the fusion device into the collapsed disc space of the patient. An insertion tool hole 106 is provided at the center position of the proximal end face of the main body 1. The insertion tool passes through the insertion tool hole 106 and acts on the screw 5. This hole is also used for injecting bone fillers.

[0063] Refer to Figure 6a , 6bThe fusion device further includes an upper support plate 2 and a lower support plate 3. The upper transverse support plate and the lower support plate 3 are mirror images of each other (the structures of the upper and lower support plates are the same, and the following description numbers of the upper and lower support plates take the upper support plate as an example), and are respectively rotatably connected to the main body 1. They can be rotatably connected to the main body 1 through a pin shaft 7. The pin shaft 7 passes through the pin holes 8 on the upper support plate 2, the lower support plate 3 and the main body 1, so that the upper support plate 2 and the lower support plate 3 are rotatably connected to the main body 1. The upper support plate 2 and the lower support plate 3 can rotate relative to the main body 1 by the push of the spreading push block 4. The pin holes 8 are located near the proximal end of the fusion device. After the upper support plate 2 and the lower support plate 3 rotate away from the main body 1, the vertical distance between the upper and lower support plates 3 at the distal end of the fusion device increases, thereby restoring a more natural lordotic curvature of a specific segment of the lumbar spine. The upper support plate 2 and the lower support plate 3 are also designed with a hollowed-out middle 9 for implanting bone fillers to fuse with adjacent vertebral bodies as soon as possible. The distal ends of the upper support plate 2 and the lower support plate 3 are both designed in a wedge shape 208 to help the fusion device insert into the collapsed disc space of patients with degenerative disc disease while minimizing damage to the surrounding anatomical structures. The upper support plate 2 and the lower support plate 3 have a bone contact surface 201, and the bone contact surface 201 contacts the vertebral bodies of the adjacent disc space for the fusion device to be embedded. There are anti-movement grooves 203 on the bone contact surface 201. After the fusion device is implanted into the patient's intervertebral space, the anti-movement grooves 203 prevent the fusion device from sliding. The anti-movement grooves 203 can be in the form of teeth as shown in the figure, or other treatment means (for example, through processes such as sandblasting) can be used to make the bone contact surface 201 produce a rough or uneven surface to promote bone growth.

[0064] The upper support plate 2 and the lower support plate 3 have a main body contact surface 202, and reinforcing ribs 207 are provided on the main body contact surface 202. After the fusion device is implanted into the intervertebral disc space, the compressive strength of the adjacent vertebral bodies on the upper support plate 2 and the lower support plate 3 is enhanced. Embedding tool grooves 204 are respectively provided on the proximal end faces of the upper support plate 2 and the lower support plate 3.

[0065] See Figure 7 , the fusion device further includes a spreading push block 4 disposed between the upper support plate 2 and the lower support plate 3 and located in the hollowed-out middle of the main body 1. A screw rod 5 passes through the spreading push block 4 and is threadedly connected to the spreading push block 4. When the screw rod 5 rotates, the spreading push block 4 moves toward the proximal end of the main body 1 or toward the distal end of the main body 1. The spreading push block 4 includes a push block body 401, and inclined surfaces 402 for spreading the upper support plate 2 and the lower support plate 3 are provided on both the upper and lower surfaces of the push block body 401. When the spreading push block 4 moves, the inclined surfaces 402 on the moving push block body 401 spread the upper support plate 2 and the lower support plate 3 or contract the upper support plate 2 and the lower support plate 3, so that the spreading angle of the upper support plate 2 and the lower support plate 3 increases or decreases. In order to reduce the frictional resistance at the mating portion of the upper support plate 2 and the lower support plate 3 with the inclined surface 402 when the push block body 401 moves, the mating portion of the upper support plate 2 and the lower support plate 3 with the inclined surface 402 is designed as a circular arc surface 205.

[0066] Since the upper support plate 2 and the lower support plate 3 are rotatably connected to the main body 1, the upper support plate 2 and the lower support plate 3 may rotate by themselves. Therefore, a wedge surface 403 for preventing the upper and lower support plates 3 from rotating by themselves is provided on the push block body 401. The two sides of the push block body 401 extend towards the proximal end of the main body 1, and the wedge surface 403 is provided at the extended end. Correspondingly, flanges 206 are provided at the parts of the upper support plate 2 and the lower support plate 3 that cooperate with the wedge surface 403. The wedge surface 403 cooperates with the flanges 206 to prevent the upper support plate 2 and the lower support plate 3 from rotating relative to the main body 1 by themselves.

[0067] See Figure 8 , the fusion device further includes a screw 5. Only by driving the screw 5 to rotate can the spreading push block 4 be moved. The outer surface of the part of the screw 5 close to the proximal end is a thread 501. The screw 5 passes through the spreading push block 4, and the threaded part of the screw is threadedly connected to the thread 501 of the spreading push block 4. Therefore, a threaded hole 404 that cooperates with the threaded part of the screw is provided on the push block body 401. The distal end of the screw 5 passes through the threaded hole 404 of the push block body 401 and abuts against the screw hole 102 of the main body 1. A socket 502 that can be connected to an insertion tool or other mechanisms (such as a slotted or cross screwdriver head structure or a Phillips head hole, etc.) is provided at the proximal end of the screw 5, and the insertion tool drives the screw 5 to rotate.

[0068] After the fusion device is implanted into the lumbar intervertebral space and the patient resumes normal activities, the implant will be subjected to forces and strains that will cause the screw 5 to withdraw, resulting in the fusion device shrinking and the spreading angle becoming smaller. Therefore, in order to prevent the screw 5 from rotating by itself and causing the spreading angle of the fusion device to become smaller, the screw 5 uses a thread 501 with a self-locking function. However, in order to further prevent the screw 5 from rotating by itself, see Figure 9 , 11 -13, the fusion device further includes a screw locking member 6. The screw locking member 6 is snap-fitted into the slot 103 at the distal end of the main body and cooperates with the part between the thread 501 of the screw 5 and the distal end of the screw 5. The cross-section of the part of the screw 5 that cooperates with the screw locking member 6 is a polygon 503, which is used to limit the self-rotation of the screw 5. The part of the screw locking member 6 that contacts the screw 5 has a certain elastic deformation. When the screw 5 rotates, the screw locking member 6 encounters the edge of the polygon 503 surface, and the edge can push the screw locking member 6 away. Subsequently, the screw locking member returns to its original shape. When the polygon surface encounters the screw locking member during the rotation of the screw, the screw locking member is pushed away and then returns to its original state. Only when the force applied to the screw 5 by the surgeon during the implantation process increases enough to overcome the edge of the polygon 503 surface of the screw 5 can the screw 5 rotate, so as to achieve the self-locking function of the screw locking member and prevent the screw from rotating by itself.

[0069] See Figure 9 , 11-13. The bottom of the contact part between the screw locking part 6 and the screw 5 is a limiting arc surface 601, and the limiting arc surface 601 also has the function of supporting the screw 5. On both sides of the contact part between the screw locking part 6 and the screw 5, first grooves 602 are respectively opened on the side edges far from the screw 5. When the screw 5 rotates, the first grooves 602 provide space for the screw locking part 6 to spring open. On the screw locking part 6, second grooves 603 are opened at both ends of the limiting arc surface 601. When the screw 5 rotates, both sides of the screw locking part 6 can spring open more easily. Since the screw locking part 6 is clamped in the clamping groove 103, in order to prevent the screw locking part 6 from falling off the clamping groove 103, the upper part of the contact part between the screw locking part 6 and the screw 5 extends in the direction away from the screw 5, and a first step 604 is arranged at the extended end. Correspondingly, a second step 1031 is arranged in the clamping groove 103, and the first step 604 is clamped on the second step 1031 to prevent the screw locking part 6 from falling off the clamping groove 103.

[0070] See Figure 10 , the upper support plate 2 and the lower support plate 3 are rotatably connected to the main body 1 through a pin shaft 7. One end of the pin shaft 7 is provided with a fourth step 701, and correspondingly, a fifth step 801 is also arranged at the end of the pin hole 8. The fourth step 701 is embedded in the fifth step 801 to prevent the pin shaft 7 from falling out of the pin hole 8. In order to further prevent the pin shaft 7 from falling off, a riveting edge 702 is arranged at the other end of the pin shaft 7. After the pin shaft 7 is installed, the riveting edge 702 is extruded by a tapered punch to turn the riveting edge 702 outwards, so as to achieve the self-locking function.

[0071] The opening angle of the angle-expandable intervertebral fusion device of the present invention ranges from 0 degree to 20 degrees, and is gradually expanded to an oblique anterior convexity or anterior convex angle of 20° according to the clinical needs of patients, and is applicable to lumbar fusion surgery.

[0072] Such as Figure 1-13 , the fusion device of this embodiment can adopt surgical methods such as PLIF and TLIF, and can be used for open surgery or minimally invasive surgery. PLIF is posterior lumbar interbody fusion, and TLIF is transforaminal lumbar interbody fusion.

[0073] Embodiment 2

[0074] This embodiment provides a fusion device with another structure, which is mainly applicable to transforaminal lumbar interbody fusion (TLIF). Such as Figure 14-17 , the structure is similar to that of the fusion device in Embodiment 1. Since TLIF is a transforaminal lumbar interbody fusion surgery, the rotation axis of the upper support plate 2 and the lower support plate 3, that is, the axis of the pin shaft 7, is designed to be parallel to the axis of the vertebral body coronal plane. In order to ensure that the upper support plate 2 and the lower support plate 3 fit with adjacent vertebral bodies, the main body 1, the push block body 401 and the pin shaft 7 are all designed to be inclined. Such as Figure 15, the central axis of the pin shaft 7 is parallel to the proximal end face 108 of the main body, and the included angle between the proximal end face of the fusion device, that is, the proximal end face 108 of the main body 1 and the proximal side face 109 is 50 - 60 degrees. The distal end of the main body 1 is designed as an arc 1010, which cooperates with the annulus fibrosus of the vertebral body to increase the contact area. As Figure 16 , the spreading push block 4 is designed to be inclined relative to the spreading push block 4 of Embodiment 1. Since the entire fusion device is designed to be in an inclined state, in order for the spreading push block 4 to cooperate with the upper support plate 2 and the lower support plate 3, only one side of the spreading push block has a wedge surface 403 to prevent the upper support plate 2 and the lower support plate 3 from rotating self - rotatably. The supporting principle of the upper support plate 2 and the lower support plate 3 is the same as that of PLIF.

[0075] The intervertebral fusion device of the present invention enables a surgeon to gradually spread to an oblique lordosis or lordosis angle of 20 degrees according to the clinical needs of a patient. In this way, the doctor does not need to, as before, spread the adjacent vertebral bodies by an excessive distance and repeat the operation of trial - fitting and inserting into the intervertebral space to determine a fusion device with an appropriate height. Therefore, the intervertebral fusion device of the present invention reduces problems such as postoperative lumbar muscle pain and dysfunction caused by excessive traction on muscles, nerves, and the dura mater during the implantation of a traditional fusion device, while reducing the damage to the surrounding anatomical structures and shortening the operation time. In particular, the present invention also integrates a self - locking function. The screw 5 is self - locked by a self - locking member to prevent the screw 5 from rotating self - rotatably, avoiding the change of the spreading angle of the fusion device after the fusion device is implanted into the patient's intervertebral space; and the wedge surface 403 of the spreading push block 4 cooperates with the flange 206 of the upper support plate 2 and the lower support plate 3 to prevent the upper support plate 2 and the lower support plate 3 from rotating around the pin shaft 7 by themselves; the riveting edge setting of the pin shaft 7 achieves the self - locking effect of the pin shaft 7 and increases the reliability of the pin shaft 7.

[0076] Embodiment 3

[0077] A spinal implant system includes the angle - adjustable spreading intervertebral fusion device described in Embodiment 1 or Embodiment 2.

[0078] The above - mentioned embodiments of the present invention have been described in detail in conjunction with the accompanying drawings, but the present invention is not limited to the above - mentioned embodiments. Even if various changes are made to the present invention, provided that these changes fall within the scope of the claims of the present invention and their equivalent technologies, they still fall within the protection scope of the present invention.

Claims

1. An angle-expandable intervertebral fusion device, characterized in that Comprising: A main body; An upper support plate disposed on the upper part of the main body, with the proximal end of the upper support plate rotatably connected to the proximal end of the main body; A lower support plate disposed on the lower part of the main body, with the proximal end of the lower support plate rotatably connected to the proximal end of the main body; A spreading push block located between the upper support plate and the lower support plate, the spreading push block being located within the main body and movable within the main body. The spreading push block includes a push block body, and inclined surfaces for spreading the upper support plate and the lower support plate are provided on both the upper and lower surfaces of the push block body; A screw rod, one end of the screw rod being threadedly connected to the spreading push block and the other end being located at the distal end of the main body; A screw rod locking member disposed at the distal end of the main body, the screw rod locking member being assembled in cooperation with the screw rod. The cross-section of the portion where the screw rod cooperates with the screw rod locking member is polygonal, and the portion of the screw rod locking member cooperating with the screw rod has elastic deformation; An external tool rotates the screw rod to move the spreading push block towards the distal end or towards the proximal end within the main body, so as to increase or decrease the angle at the distal ends of the upper support plate and the lower support plate; The bottom of the contact portion between the screw rod locking member and the screw rod is a limiting arc surface. On both sides of the contact portion between the screw rod locking member and the screw rod, first grooves are respectively opened on the sides away from the screw rod. When the screw rod rotates, the first grooves provide space for the screw rod locking member to spring open; on the screw rod locking member, second grooves are opened at both ends of the limiting arc surface.

2. The angle-expandable intervertebral fusion device according to claim 1, characterized in that, A card slot is opened at the distal end of the main body, and the screw rod locking member is inserted into the card slot.

3. The angle-expandable intervertebral fusion device according to claim 2, characterized in that, The upper part of the contact portion between the screw rod locking member and the screw rod extends towards the direction away from the screw rod, and a first step is provided at the extended end. Correspondingly, a second step is provided in the card slot, and the first step is clamped on the second step to prevent the screw rod locking member from falling out of the card slot.

4. The angle-expandable intervertebral fusion device according to claim 1, characterized in that, Both sides of the push block body extend towards the proximal end of the main body, and a wedge surface is provided at the extended end. Correspondingly, flanges are provided at the portions of the upper support plate and the lower support plate cooperating with the wedge surface, and the wedge surface cooperates with the flanges to prevent the upper support plate and the lower support plate from rotating relative to the main body.

5. The angle-expandable intervertebral fusion device according to claim 1, characterized in that, The upper support plate and the lower support plate are rotatably connected to the main body through a pin shaft.

6. The angle-expandable intervertebral fusion device according to claim 5, characterized in that, One end of the pin shaft is provided with a riveting edge. After the pin shaft is installed, the riveting edge is turned outwards to prevent the pin shaft from falling off.

7. The angle-expandable intervertebral fusion device according to claim 1, characterized in that, Arc surfaces cooperating with the inclined surfaces are provided on both the upper support plate and the lower support plate.

8. The angulatable intervertebral fusion device according to claim 1 or 7, characterized in that, The distal ends of both the upper support plate and the lower support plate are wedge-shaped.

9. The angle-expandable intervertebral fusion cage according to claim 1 or 7, characterized in that, Anti-slip grooves are provided on the bone contact surfaces of both the upper support plate and the lower support plate to prevent the fusion device from sliding after being implanted into the intervertebral space.

10. The angulatable intervertebral fusion cage according to claim 1 or 7, characterized in that, Reinforcing ribs are provided on the contact surfaces between the upper support plate, the lower support plate and the main body.

11. The angle-expandable intervertebral fusion device according to claim 1, characterized in that, A clamping groove for external instrument clamping is provided at the proximal end of the main body.

12. The angle-expandable intervertebral fusion device according to claim 1, characterized in that, Support surfaces for contacting the vertebral body are respectively provided on the upper and lower surfaces at the proximal end of the main body.

13. The angulable intervertebral fusion cage according to claim 12, wherein The support surface is an inclined surface with an angle of 5° - 10° with the horizontal plane.

14. The angle-expandable intervertebral fusion device according to claim 1, characterized in that, The angle that the fusion device can be spread is 0° - 20°.

15. An angle-expandable intervertebral fusion device, characterized in that, Comprising the angle-adjustable intervertebral fusion device according to any one of claims 1 - 14; The proximal end face of the fusion device and the pin shaft are inclined, and the proximal end face of the fusion device is parallel to the axis of the pin shaft.

16. The angle-expandable intervertebral fusion device according to claim 15, characterized in that, The angle formed by the proximal end face of the fusion device and the proximal side face is 50° to 60°.

17. A spinal implant system, characterized in that, Comprising the angle-expandable intervertebral fusion device according to any one of claims 1-15 or the angle-expandable intervertebral fusion device according to any one of claims 15-16.

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