An interbody fusion device for insertion

Abstract

This invention relates to the field of medical devices and discloses an interbody fusion cage insertion device, including a slide seat that can be mounted on an operating rod. A guide groove is formed on the slide seat, with its front end penetrating the slide seat. A cover plate is movably installed within the guide groove. The cover plate can extend and retract axially relative to the operating rod along the guide groove. The inner side of the cover plate has a mating surface adapted to the outer wall of the interbody fusion cage. When the interbody fusion cage is implanted into the intervertebral space, the front end of the cover plate abuts against the posterior edge of the vertebral body. As the interbody fusion cage moves forward into the intervertebral space, the cover plate moves posteriorly relative to the interbody fusion cage. Through the sliding between the cover plate and the interbody fusion cage, it is ensured that the filling groove of the interbody fusion cage is covered and sealed when implanted. This prevents bone fragments from being dislodged during the insertion of the interbody fusion cage, does not affect the implantation operation, and does not reduce the bone graft space, significantly improving the success rate of interbody fusion surgery.

Description

Technical Field

[0001] This invention relates to the field of medical devices, specifically to an interbody fusion device insertion device. Background Technology

[0002] Interbody fusion surgery in spinal surgery requires the use of an interbody fusion cage. After treating the endplates of the intervertebral space, autologous bone, artificial bone, or a mixture of bone granules are filled into the groove of the fusion cage and compacted. The fusion cage is then held in place by a specialized driving device and gradually driven into the intervertebral space by repeated tapping with a hammer. To achieve immediate postoperative stability, the thickness of the fusion cage is usually slightly larger than the width of the intervertebral space, creating an interference fit to facilitate immediate clamping and fixation of the fusion cage after surgery.

[0003] However, the intense vibrations generated by the tapping can be transmitted to the fusion cage, especially when the fusion cage is not fully inserted into the intervertebral space, where the compacted bone particles are easily loosened and dislodged. Bone particles are the material basis for bone fusion, and their loss not only significantly reduces the bone graft fusion rate and increases the risk of long-term complications such as pseudoarthrosis and fusion cage subsidence, but free bone particles may also compress nerves, causing serious adverse events such as postoperative lower limb pain and numbness.

[0004] To address these issues, current clinical remedial measures have not been ideal. For example, excessive compaction of bone particles can damage their porous structure and affect bone healing; slowing down the insertion speed can prolong the operation time; and some fusion devices use an integrated cover plate design, which increases the difficulty of implantation, reduces the space for bone grafting, and hinders the contact between bone particles and the endplate.

[0005] Therefore, there is an urgent clinical need for a device that can effectively prevent bone fragments from being dislodged during the insertion of the interbody fusion device without affecting the implantation of the fusion device or reducing the bone graft space, so as to improve the success rate of interbody fusion surgery and reduce the incidence of postoperative complications. Summary of the Invention

[0006] The purpose of this invention is to overcome the shortcomings of the prior art and provide an interbody fusion device. By sliding the cover plate relative to the interbody fusion device, it ensures that the filling slot of the interbody fusion device can be covered and sealed when it is implanted. This not only prevents bone fragments from being dislodged during the implantation of the interbody fusion device, but also does not affect the implantation operation of the interbody fusion device, and does not reduce the bone graft space, thus significantly improving the success rate of interbody fusion surgery.

[0007] To achieve the above objectives, the technical solution adopted by the present invention is as follows: An interbody fusion device includes a slide that can be mounted on an operating rod. The slide has a guide groove extending axially along the operating rod. The front end of the guide groove passes through the slide. A cover plate is movably mounted within the guide groove. The cover plate is axially extendable and retractable relative to the operating rod along the guide groove. The inner side of the cover plate has a mating surface that adapts to the outer wall of the interbody fusion device. The mating surface can cover the filling slot of the interbody fusion device to achieve sealing. When the interbody fusion device is implanted into the intervertebral space, the front end of the cover plate abuts against the posterior edge of the vertebral body.

[0008] Optionally, the slide block can be detachably mounted on the operating lever, and the slide block can slide relative to the operating lever in the axial direction.

[0009] Optionally, the bottom of the slide is provided with a slot, and two first springs capable of elastic deformation are arranged opposite each other in the slot. After the operating rod radially presses the first springs into the slot, the first springs abut against the outer side of the operating rod.

[0010] Optionally, the guide rod is provided with a wave groove extending along the axial direction, and the second spring is provided with a protrusion that matches the wave groove, and the protrusion is embedded in the wave groove.

[0011] Optionally, the outer side of the operating lever is provided with an axially extending groove, and the inner wall of the groove is provided with a positioning bead that can extend and retract radially. When the positioning bead is embedded in the positioning section of the groove, the slide block can move synchronously with the operating lever. When the positioning pin is embedded in the guide section of the groove, the slide block can slide axially relative to the operating lever. The positioning section is located in front of the guide section, and the two are separated by a protrusion. The depth of the guide section is greater than the depth of the positioning section.

[0012] Optionally, the slide block is further provided with a first groove extending axially along the operating rod. A guide rod is slidably installed in the first groove. The guide rod is fixedly connected to the cover plate, and a pressure plate for limiting the radial displacement of the guide rod is fixedly installed on the outside of the first groove.

[0013] Optionally, the pressure plate has a second groove corresponding to the first groove, the guide rod passes through the first groove and the second groove, and a second spring that can undergo elastic deformation is fixedly installed inside the second groove, the second spring abutting against the outer side of the guide rod.

[0014] Optionally, the slide block is further provided with a limiting groove for limiting the axial extension distance of the cover plate. The limiting groove is connected to the first groove and the guide groove, and the connection between the guide rod and the cover plate is located in the limiting groove.

[0015] Optionally, two cover plates are provided opposite to each other, and the two cover plates are connected by a connecting plate. The connecting plate is located in the limiting groove, and the guide rod is fixedly connected to the connecting plate.

[0016] Optionally, the cover plate has an outwardly convex arc-shaped structure, and the distance between the two cover plates decreases from back to front to clamp the filling slot of the intervertebral fusion device.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows: (1) In this invention, while the filling slot of the intervertebral fusion device is sealed by the cover plate, the front end of the cover plate abuts against the posterior edge of the vertebral body and can extend and retract axially relative to the operating rod along the guide groove. Therefore, as the intervertebral fusion device moves forward into the intervertebral space, the cover plate will move backward relative to the intervertebral fusion device, so that the filling slot is sealed by the cover plate and the inner wall of the intervertebral space in real time, thereby preventing bone particles from being shaken out during the insertion of the intervertebral fusion device. The device has a simple structure, is easy to operate, and has a low failure rate. It will not affect the intervertebral fusion device implantation operation, nor will it reduce the bone graft space of the intervertebral fusion device. It can significantly improve the success rate of intervertebral fusion surgery and reduce the incidence of postoperative complications. (2) In this invention, after the slide is fitted onto the operating rod through the slot, the two first springs can clamp the slide onto the operating rod so that the slide will not fall off. Moreover, since the first springs are elastic, only a small force is needed to separate the slide from the operating rod. At the same time, the slide can be quickly installed on the operating rod, which greatly improves the disassembly and assembly efficiency of the device and facilitates dealing with unexpected situations and subsequent operations of intervertebral fusion surgery. (3) In this invention, when the interbody fusion device has just been fully inserted into the vertebral body, it is necessary to continue tapping. At this time, the cover plate retracts into place, and the tapping force will be transmitted to the slide through the cover plate to drive the positioning bead from the positioning section of the slide groove over the protrusion and into the guide section. The depth of the guide section of the slide groove changes from shallow to deep from front to back. Once the slide passes the protrusion and enters the guide section, it will automatically slide upward to the end point. This can both remind the surgeon to remove the slide and prevent the front end of the cover plate from impacting the posterior edge of the vertebral body due to the presence of the slide, thus avoiding unnecessary damage to the vertebral body. (4) In this invention, the guide rod can only slide along the first groove axially due to the limitation of the pressure plate, thereby improving the stability of the cover plate sliding. Moreover, the guide rod has a wave groove and the second spring has a protrusion. Through the fit of the two, damping will be generated when the guide rod moves axially, preventing the cover plate from sliding randomly in the guide groove, ensuring that the feed amount of the intervertebral fusion device is equal to the sliding amount of the cover plate relative to the intervertebral fusion device, ensuring that the displacement of the intervertebral fusion device and the cover plate is equal during the implantation process, and improving the effect of the device in preventing bone particles from being shaken out. Attached Figure Description

[0018] Figure 1This is an exploded structural diagram of the interbody fusion device driven into place in an embodiment of the present invention; Figure 2 This is a schematic diagram of the interbody fusion device (cover plate retracted) in an embodiment of the present invention; Figure 3 This is a schematic diagram of the interbody fusion device (cover plate extended) in an embodiment of the present invention; Figure 4 This is a schematic diagram of the interbody fusion device (slide seat moved backward) in an embodiment of the present invention; Figure 5 This is a schematic diagram of the slide block structure in an embodiment of the present invention; Figure 6 This is a schematic diagram of the positional structure of the cover plate and the connecting plate in an embodiment of the present invention; Figure 7 This is a schematic diagram of the assembly structure of the slide and the operating lever in an embodiment of the present invention; Figure 8 This is a schematic diagram of the assembly structure of the slide and the cover plate in an embodiment of the present invention; Figure 9 yes Figure 8 A magnified schematic diagram of the local structure at point A; Figure 10 This is a schematic diagram of the structure in an embodiment of the present invention where the cover plate retracts relative to the slide. Figure 11 This is a schematic diagram of the structure in an embodiment of the present invention, showing the cover plate extending relative to the slide. Figure 12 This is a schematic diagram of the arc-shaped cover plate in an embodiment of the present invention; Figure 13 This is a schematic diagram of the positional structure of the wave groove and the protrusion in an embodiment of the present invention; Among them, 1. operating lever; 101. handle; 102. interface; 2. interbody fusion device; 201. filling groove; 3. Slide; 301. Slot; 302. Limiting slot; 303. Guide slot; 304. First groove; 305. Mounting slot; 4. Cover plate; 401. Connecting plate; 402. Alternating groove; 5. Guide rod; 6. Pressure plate; 601. Second groove; 7. Slide groove; 701. Guide section; 702. Positioning section; 703. Protrusion; 8. Positioning hole; 9. Positioning bead; 10. Spring; 11. Fastener; 12. First spring; 13. Second spring; 14. Wave groove; 15. Protrusion. Detailed Implementation

[0019] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. These drawings are simplified schematic diagrams, which are only used to illustrate the basic structure of the present invention and therefore only show the components relevant to the present invention.

[0020] Interbody fusion surgery in spinal surgery requires the use of an interbody fusion device 2. The interbody fusion device 2 can be fixed and clamped by a special insertion device, and the device is driven into the intervertebral space by striking the tail end with a hammer. The intervertebral space is on the vertebral body, and its opening end is located at the posterior edge of the vertebral body. The space for filling bone particles in the interbody fusion device 2 is the filling groove 201, and the filling groove 201 of the interbody fusion device 2 is usually distributed on both sides of it.

[0021] The existing insertion device has an interface 102 at the front end of the operating rod 1 for clamping the interbody fusion device 2, and an inclined handle 101 is fixedly installed near the rear end for the surgeon to grip. The clamping and fixing method between the interbody fusion device 2 and the interface 102 is existing technology and will not be described in detail here. For ease of description, the end of the operating rod 1 used to clamp the interbody fusion device 2 is designated as the front end, and the striking end is designated as the rear end. That is, during use, the interbody fusion device 2 is located at the front end of the operating rod 1. After the insertion device is gripped by the handle 101, the rear end of the operating rod 1 is struck with a hammer or other tool, so that the interbody fusion device 2 enters the intervertebral space from back to front. This is a common method of interbody fusion surgery.

[0022] Example 1, as Figures 1-11 As shown, an intervertebral fusion device includes a slide 3 that can be mounted on an operating rod 1. The slide 3 has a guide groove 303 that extends axially along the operating rod 1. The front end of the guide groove 303 passes through the slide 3. A cover plate 4 is movably installed in the guide groove 303. The cover plate 4 can extend and retract axially relative to the operating rod 1 along the guide groove 303. The inner side of the cover plate 4 has a mating surface that is adapted to the outer wall of the intervertebral fusion device 2. The mating surface can cover the filling slot 201 of the intervertebral fusion device 2 to achieve sealing.

[0023] As described above, the front end of the cover plate 4 is flat. Before the intervertebral fusion device 2 is fully inserted into the intervertebral space, the relative position of the slide 3 and the intervertebral fusion device 2 remains unchanged. Moreover, when the intervertebral fusion device 2 is implanted into the intervertebral space, the front end of the cover plate 4 abuts against the posterior edge of the vertebral body. Therefore, as the back end of the operating rod 1 is struck, and the intervertebral fusion device 2 enters the intervertebral space from back to front, the cover plate 4 will move backward relative to the intervertebral fusion device 2, so that the filling groove 201 is sealed in real time by the cover plate 4 and the inner wall of the intervertebral space, thereby preventing bone particles from being dislodged during the insertion of the intervertebral fusion device 2. This device has a simple structure, is easy to operate, and has a low failure rate. It will not affect the implantation operation of the intervertebral fusion device 2, nor will it reduce the bone graft space of the intervertebral fusion device 2. It can significantly improve the success rate of intervertebral fusion surgery and reduce the incidence of postoperative complications. Moreover, without changing the shape and basic function of the original insertion device, the structure such as the slide 3 of this device can be connected to achieve the function of preventing bone particles from being dislodged. It is also ingenious in structure, easy to operate, and reliable in function.

[0024] During this process, the mating surface of the inner side of the cover plate 4, which is adapted to the outer wall of the intervertebral fusion device 2, cooperates with the inner wall of the intervertebral space. After the filling groove 201 enters the intervertebral space, the inner wall of the intervertebral space will also block it. Therefore, the feed amount of the intervertebral fusion device 2 is equal to the displacement of the cover plate 4 relative to the intervertebral fusion device 2. Thus, with the mutual cooperation of the two surfaces (the mating surface and the inner wall surface of the intervertebral space), it can be ensured that the filling groove 201 is blocked in real time.

[0025] The guide groove 303 can restrict the cover plate 4 to extend and retract only along its length. If the length of the filling slot 201 is L and the distance between the rear end point of the filling slot 201 and the rear end point of the fusion device is l, then the extension and retraction length of the cover plate 4 is not less than L+l, and the width of the cover plate 4 is not less than the width of the filling slot 201, thereby ensuring that the cover plate 4 can fully cover and seal the filling slot 201.

[0026] Since the filling slots 201 of the intervertebral fusion device 2 are usually distributed on both sides, two cover plates 4 are also provided in this device. The two cover plates 4 are connected by a connecting plate 401 and form a U-shaped structure. Moreover, the cover plate 4 and the connecting plate 401 are integrally formed, which is convenient for manufacturing and processing. Similarly, two guide grooves 303 are also provided on the slide 3.

[0027] Furthermore, the interbody fusion cage 2 has a shape similar to a double concave surface. Correspondingly, the two cover plates 4 are designed to clamp towards the center to ensure the bone granules are compressed, and the distance between their front ends is closer to ensure clamping. Therefore, the cover plates 4 have an outwardly convex arc-shaped structure, and the distance between the two cover plates 4 decreases from back to front to clamp the filling groove 201 of the interbody fusion cage (e.g., ...). Figure 12 (As shown).

[0028] In Example 2, based on Example 1, the interbody fusion device proposed in this invention also discloses the following structure.

[0029] like Figure 5 , Figure 7 and Figure 10 As shown, the slide block 3 also has a first groove 304 extending axially along the operating rod 1. A guide rod 5 is slidably installed in the first groove 304. The front end of the guide rod 5 is fixedly connected to the cover plate 4, and a pressure plate 6 is fixedly installed on the outside of the first groove 304 to limit the radial displacement of the guide rod 5. The guide rod 5 can only slide axially along the first groove 304 by the limitation of the pressure plate 6, thereby improving the stability of the cover plate 4 sliding axially.

[0030] The slide block 3 has an installation groove 305 located in the axial center of the first groove 304. The pressure plate 6 can be fixedly embedded in the installation groove 305, which can not only achieve radial positioning of the guide rod 5, but also prevent the pressure plate 6 from protruding from the slide block 3, thus ensuring the aesthetic structure of the device.

[0031] Furthermore, a second groove 601 corresponding to the first groove 304 is provided on the pressure plate 6. The guide rod 5 passes through the first groove 304 and the second groove 601. A second spring 13 capable of elastic deformation is fixedly installed inside the second groove 601. The second spring 13 presses against the outer side of the guide rod 5.

[0032] Multiple second spring plates 13 are provided and distributed circumferentially along the inner side of the second groove 601. By radially pressing the guide rod 5 with the second spring plates 13, the guide rod 5 can generate greater frictional damping when moving axially, so as to prevent the cover plate 4 from sliding freely in the guide groove 303. This ensures that the feed amount of the intervertebral fusion device 2 is equal to the sliding amount of the cover plate 4 relative to the intervertebral fusion device 2, and ensures that the displacement of the intervertebral fusion device 2 and the cover plate 4 are equal during the implantation process, thereby improving the effect of the device in preventing bone fragments from being dislodged.

[0033] In addition, the guide rod 5 is fixedly connected to the connecting plate 401, and the slide block 3 is also provided with a limiting groove 302 for limiting the axial extension distance of the cover plate 4. The limiting groove 302 is connected to the first groove 304 and the guide groove 303, and the connection between the guide rod 5 and the cover plate 4 is located in the limiting groove 302, that is, the connecting plate 401 is located in the limiting groove 302. When the connecting plate 401 abuts against the front wall of the guide groove 303, the cover plate 4 reaches the maximum extension position. When the connecting plate 401 abuts against the rear wall of the guide groove 303, the cover plate 4 reaches the maximum retraction position, thereby better limiting the extension range of the cover plate 4.

[0034] Before the cover plate 4 reaches its maximum retracted position, the striking force of the striking lever 1 will only act on the cover plate 4, causing it to slide the guide rod 5 within the first groove 304. The striking force is greater than the axial frictional damping generated by the second spring 13 on the guide rod 5, ensuring that the guide rod 5 can still slide normally after the operating lever 1 is struck, without arbitrarily shifting. Once the cover plate 4 reaches its maximum retracted position, the striking force of the striking lever 1 will be transmitted through the cover plate 4 to the slide block 3. At this point, the slide block 3 needs to be removed, or it needs to be allowed to slide relative to the operating lever 1.

[0035] Example 3, as Figure 13 As shown, based on Embodiment 2, the guide rod 5 is provided with a wave groove 14 extending axially, and the second spring 13 is provided with a protrusion 15 that matches the wave groove 14. The protrusion 15 is embedded in the wave groove 14. Through the fit between the two, damping is generated when the guide rod 5 moves axially. Compared with friction damping, its stability and damping effect are better, which can ensure that the guide rod 5 does not move randomly, and can also slide normally after the operating rod 1 is hit.

[0036] In Example 4, the interbody fusion device proposed in this invention has a detachable connection between the slide 3 and the operating rod 1, that is, the slide 3 can be detachably installed on the operating rod 1 to be compatible with various brands of insertion devices.

[0037] like Figure 1 , Figure 5 and Figure 7 As shown, the bottom of the slide block 3 has a slot 301. Two elastically deformable first springs 12 are arranged opposite each other within the slot 301. After the operating rod 1 radially presses the first springs 12 into the slot 301, the first springs 12 abut against the outer side of the operating rod 1. After the slide block 3 is fitted onto the operating rod 1 through the slot 301, the two first springs 12 can clamp the slide block 3 onto the operating rod 1, preventing it from falling off. Furthermore, due to the elasticity of the first springs 12, only a small force is needed to separate the slide block 3 from the operating rod 1, and the slide block 3 can also be quickly installed onto the operating rod 1. This greatly improves the efficiency of the device's assembly and disassembly, facilitating responses to unexpected situations and subsequent operations during intervertebral fusion surgery.

[0038] Specifically, in the free state, the distance between the two first springs 12 is less than the outer diameter of the operating rod 1. When the slide block 3 is installed or removed radially on the operating rod 1, the first springs 12 will be subjected to radial compression and undergo elastic deformation, so that the distance between the two first springs 12 is just enough for the operating rod 1 to pass through. For example, when the operating rod 1 is inserted into the slot 301, the first springs 12 return to the free state and at this time the first springs 12 abut against the outer side of the operating rod 1 to achieve radial fixation and limitation.

[0039] In Example 5, in the intervertebral fusion device proposed in this invention, the slide block 3 can also slide relative to the operating rod 1 along the axial direction.

[0040] like Figure 2 , Figure 4 and Figures 7-9 As shown, the outer side of the operating lever 1 is provided with a sliding groove 7 extending along the axial direction. The inner wall of the slot 301 is provided with a positioning bead 9 that can extend and retract radially. When the positioning bead 9 is embedded in the positioning section 702 of the sliding groove 7, the slide block 3 can move synchronously with the operating lever 1. When the positioning pin is embedded in the guide section 701 of the sliding groove 7, the slide block 3 can slide relative to the operating lever 1 along the axial direction. The positioning section 702 is located in front of the guide section 701, and the two are separated by a protrusion 703. The depth of the guide section 701 is greater than the depth of the positioning section 702.

[0041] When the interbody fusion device 2 has just fully entered the vertebral body, it is necessary to continue tapping. At this time, the cover plate 4 retracts into place, and the tapping force will be transmitted to the slide 3 through the cover plate 4 to drive the positioning bead 9 from the positioning section 702 of the slide groove 7 over the protrusion 703 and into the guide section 701. This causes the slide 3 to slide a greater distance towards the rear end of the operating rod 1, which can both prompt the surgeon to remove the slide 3 and prevent the front end of the cover plate 4 from impacting the posterior edge of the vertebral body due to the presence of the slide 3, thus avoiding unnecessary damage to the vertebral body.

[0042] As described above, the inner wall of the slot 301 is provided with a positioning hole 8 extending radially. The positioning bead 9 is embedded in the positioning hole 8. The inner opening diameter of the positioning hole 8 is smaller than the diameter of the positioning bead 9, so the positioning bead 9 can protrude from the inner wall of the slot 301 without falling off. At the same time, a fastener 11, such as a screw, is screwed and fixed at the outer opening of the positioning hole 8. A spring 10 is also embedded in the positioning hole 8. One end of the spring 10 abuts against the fastener 11, and the other end abuts against the positioning bead 9, thereby realizing the function of radial extension and retraction of the positioning bead 9.

[0043] The slide 7 can be divided into a guide section 701 and a positioning section 702 from back to front. The two are separated by a protrusion 703, and the depth of the guide section 701 is greater than the depth of the positioning section 702. Therefore, when the positioning bead 9 is embedded in the positioning section 702 of the slide 7, it cannot move axially due to the obstruction of the protrusion 703 and the inner wall of the positioning section 702, thereby locking the slide 3 and ensuring that the slide 3 is relatively fixed to the operating rod 1. At this time, the striking force applied to the operating rod 1 will only act on the cover plate 4, and the cover plate 4 will then drive the guide rod 5 to move backward along the first groove 304.

[0044] When the interbody fusion device 2 has just fully entered the vertebral body, the depth is still insufficient, and further tapping is required. However, since the cover plate 4 has reached its maximum retracted position, the tapping force applied to the operating rod 1 will be transmitted to the slide 3 through the cover plate 4. This force will then push the positioning bead 9 to retract radially through the protrusion 703, allowing the positioning bead 9 to pass over the protrusion 703 and enter the guide section 701 of the slide groove 7. The depth of the guide section 701 of the slide groove 7 gradually increases from front to back. Once the slide 3 passes over the protrusion 703 and enters the guide section 701, it will automatically slide backward to the end point. This not only prompts the surgeon to remove the slide 3, but also prevents the front end of the cover plate 4 from impacting the posterior edge of the vertebral body due to the presence of the slide 3, thus avoiding unnecessary damage to the vertebral body.

[0045] In Example 6, based on the above examples, since the intervertebral fusion device 2 and the operating rod 1 are usually coaxially distributed, the slot 301 is coaxial with the operating rod 1. In order to cover the filling slot 201 after the cover plate 4 extends out, the cover plate 4 needs to be set on both sides of the operating rod 1. Therefore, the guide groove 303 is located on both sides of the slot 301.

[0046] Based on this, the positional relationship between the slot 301, the limiting slot 302, the guide slot 303, and the first groove 304 on the slide block 3 is as follows: Figure 5 As shown, at this time, the limiting groove 302 is connected to the slot 301, the guide groove 303 and the first groove 304, causing the operating rod 1 to extend into the limiting groove 302. In order to ensure that the cover plate 4 can slide smoothly relative to the operating rod 1 and avoid interference between the connecting plate 401 and the operating rod 1, a clearance groove 402 is provided on the connecting plate 401, so that the connecting plate 401 can slide on the operating rod 1 through the clearance groove 402, ensuring that the device can successfully prevent bone particles from being dislodged during the insertion of the intervertebral fusion device 2.

[0047] Workflow: S1. Fill the filling groove 201 of the interbody fusion device 2 with autologous bone, artificial bone, or mixed bone particles and compact it. Then install the interbody fusion device 2 on the front end of the operating rod 1, and then install the slide 3 on the operating rod 1 (e.g., Figure 2 (as shown) S2. Push the cover plate 4 forward using the guide rod 5 until it completely covers the filling slot 201 of the intervertebral fusion device 2 (e.g., Figure 3 , Figure 8 and Figure 11 (as shown) S3. Align the intervertebral fusion cage 2 with the intervertebral space. At this time, the front end of the cover plate 4 abuts against the posterior edge of the vertebral body. Use a hammer or other tool to strike the rear end of the operating rod 1, causing the operating rod 1 to push the intervertebral fusion cage 2 into the intervertebral space. During this process, the cover plate 4 moves backward relative to the intervertebral fusion cage 2 under the support of the posterior edge of the vertebral body, while the exposed filling groove 201 is further sealed by the inner wall of the intervertebral space until the intervertebral fusion cage 2 is completely inside the intervertebral space (e.g., ...). Figure 2 and Figure 10 (as shown) S4. Continue tapping the operating lever 1; the slide 3 moves axially backward relative to the operating lever 1 (e.g., ...). Figure 4 (As shown), to avoid damage to the vertebral body by the cover plate 4, the slide 3 can be removed from the operating rod 1 at this time to carry out the subsequent implantation operation, or the slide 3 can be removed before this step and then continue to tap.

[0048] A conspicuous mark can be made on the guide rod 5 or the connecting plate 401, such as painting the corresponding position green. When the green mark reaches the rear wall of the limiting groove 302, it indicates that the rear of the fusion device is flush with the posterior edge of the vertebral body, reminding the surgeon to start tapping slowly to prevent the interbody fusion device 2 from entering the vertebral body too deeply.

[0049] In summary, this invention proposes an interbody fusion cage insertion device. By extending and retracting the cover plate 4 along the guide groove 303 relative to the operating rod 1, bone fragments can be prevented from being dislodged during the insertion of the interbody fusion cage 2. Furthermore, the contraction of the cover plate 4 coordinates with the insertion action of the interbody fusion cage 2, ensuring equal displacement between the interbody fusion cage 2 and the cover plate 4 during implantation. Additionally, the slide 3 can move rearward relative to the operating rod 1, preventing the front end of the cover plate 4 from impacting the posterior edge of the vertebral body, thus protecting the vertebral body. The slide 3 can also be quickly installed and removed from the operating rod 1 to accommodate different operational scenarios. Moreover, the improved structure of this device is simple, with fewer parts and a low failure rate. Depending on the actual situation, it can be manufactured as a disposable device or one that can be repeatedly sterilized and reused.

[0050] The embodiments of the present invention have been described above with reference to the accompanying drawings. However, the present invention is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many improvements and modifications under the guidance of the present invention without departing from the spirit and scope of the claims. These improvements and modifications should also be considered within the scope of protection of the present invention.

[0051] In the description of this invention, it should be understood that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0052] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art will understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0053] Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

Claims

1. A device for inserting an interbody fusion cage, characterized in that: The device includes a slide that can be mounted on an operating rod. The slide has a guide groove that extends axially along the operating rod. The front end of the guide groove passes through the slide. A cover plate is movably installed in the guide groove. The cover plate can extend and retract axially relative to the operating rod along the guide groove. The inner side of the cover plate has a mating surface that is adapted to the outer wall of the intervertebral fusion device. The mating surface can cover the filling slot of the intervertebral fusion device to achieve sealing. When the intervertebral fusion device is implanted into the intervertebral space, the front end of the cover plate abuts against the posterior edge of the vertebral body. The bottom of the slide is provided with a slot, and two first springs that can undergo elastic deformation are arranged opposite each other in the slot. After the operating rod presses the first springs radially to embed them into the slot, the first springs abut against the outer side of the operating rod. The outer side of the operating lever is provided with an axially extending groove. The inner wall of the groove is provided with a positioning bead that can extend and retract radially. When the positioning bead is embedded in the positioning section of the groove, the slide block can move synchronously with the operating lever. When the positioning pin is embedded in the guide section of the groove, the slide block can slide axially relative to the operating lever. The positioning section is located in front of the guide section, and the two are separated by a protrusion. The depth of the guide section is greater than the depth of the positioning section. The slide block is also provided with a first groove extending along the axial direction of the operating rod. A guide rod is slidably installed in the first groove. The guide rod is fixedly connected to the cover plate. A pressure plate for limiting the radial displacement of the guide rod is fixedly installed on the outside of the first groove. The pressure plate has a second groove corresponding to the first groove. The guide rod passes through the first groove and the second groove. A second spring that can undergo elastic deformation is fixedly installed inside the second groove. The second spring abuts against the outer side of the guide rod. The guide rod has a wave groove extending along the axial direction, and the second spring has a protrusion that matches the wave groove, and the protrusion is embedded in the wave groove.

2. The interbody fusion device according to claim 1, characterized in that: The slide block is detachably mounted on the operating lever, and the slide block can slide relative to the operating lever along the axial direction.

3. The interbody fusion device according to claim 2, characterized in that: The slide block is also provided with a limiting groove for limiting the axial extension distance of the cover plate. The limiting groove is connected to the first groove and the guide groove, and the connection between the guide rod and the cover plate is located in the limiting groove.

4. The interbody fusion cage insertion device according to claim 3, characterized in that: Two cover plates are provided opposite to each other and are connected by a connecting plate. The connecting plate is located in the limiting groove and the guide rod is fixedly connected to the connecting plate.

5. The interbody fusion cage insertion device according to claim 4, characterized in that: The cover plate has an outwardly convex arc-shaped structure, and the distance between the two cover plates decreases from back to front to clamp the filling groove of the intervertebral fusion device.

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