Multi-dimensional three-dimensional expansion intervertebral fusion cage

Abstract

The present invention relates to the field of medical device technology, and is a multi-dimensional, three-dimensional, open-type intervertebral fusion device, which includes a sliding disc and a fixed disc. The present invention has a reasonable and compact structure and is easy to use. The device can be implanted into a predetermined intervertebral position through a surgical working channel with a diameter of less than 5 mm. No channel expansion operation is required during the operation, which can reduce the incision and reduce muscle tissue separation. The simple deployment and fixation method greatly shortens the operation time. A rectangular space is supported by all support rods and connecting rods, which greatly increases the bone grafting space and increases the fusion rate. The arrangement of the first support rod and the second support rod can increase the connection strength and stability of each support rod and the corresponding connecting rod in the rectangular space, preventing the rectangular space from being deformed after being squeezed. In addition, after the device is implanted, the bone grafting operation can be realized under direct vision through an endoscope, and precise bone grafting and control of the bone grafting amount can be performed.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices and is a multi-dimensional three-dimensional expansion type intervertebral fusion device. Background Art

[0002] Lower back pain caused by degenerative disc disease, lumbar instability, and spondylolisthesis, as well as spinal instability resulting from extensive trauma, has become a major threat to public health and a leading cause of spinal disability. The goal of spinal disease treatment is to alleviate lower back pain and restore spinal stability. Spinal fusion is an important treatment for spinal disease. It is a surgical procedure used to treat spinal instability and spondylolisthesis caused by degenerative changes, trauma, and other factors, restoring spinal mechanical stability by creating bony fusion between the upper and lower segments. In recent years, intervertebral fusion devices have been developed to increase bone graft fusion rates, reduce reliance on external fixation, and improve and maintain spinal curvature.

[0003] Good intervertebral fusion results rely on a strong bony connection between the upper and lower vertebrae, known as bony fusion, rather than simply relying on a graft or fusion device for support. Larger implants are less likely to sink or become embedded in the intervertebral space because they are more likely to transmit axial compressive stress to the surrounding area. Therefore, in theory, a larger fusion device, a greater contact area with the endplates, and a greater amount of implanted bone can improve intervertebral stability, prevent sinking, and increase the fusion rate.

[0004] The Chinese patent document with the announcement number CN 111759436B discloses a self-guided four-sided expandable endoscopic bone grafting intervertebral fusion device, which includes a driving expansion structure, a fusion body and a combination body; the driving expansion structure includes a driving screw, an expansion body and a propulsion assembly; the center of the fusion body is provided with a cylindrical shaft groove extending in the axial direction; the driving expansion structure is arranged in the cylindrical shaft groove and can slide along the axial direction of the cylindrical shaft groove; the driving screw is used to drive the expansion body to slide along the axial direction of the cylindrical shaft groove in the cylindrical shaft groove through the propulsion assembly; during the sliding process, the expansion body changes from an unexpanded state to an expanded state; the expansion body expands the intervertebral fusion device in all directions and increases its volume in the expanded state; the combination body is arranged at one end of the fusion body, and the combination body is used to connect the fusion body with the endoscopic bone grafting sleeve; the expansion body is a hollow "individual"-shaped structure that is expanded on all sides, and the center of the expansion body is a support The main shaft of the opening body is provided with multiple opening leaves around the main shaft of the opening body; the inner side of the side circumference of the columnar shaft groove is provided with multiple oblique fusion body slide grooves, and the positions of the fusion body slide grooves correspond one by one to the positions of the multiple opening leaves. When the opening body is in an unexpanded state, the opening leaves are inserted into the inside of the fusion body slide groove; when the opening body is in an expanded state, the opening leaves are detached from the fusion body slide groove; the propulsion assembly includes a front hollow propulsion assembly and a rear hollow propulsion assembly, one end of the rear hollow propulsion assembly is fixedly connected to the end of the driving screw; the other end of the rear hollow propulsion assembly is connected to one end of the main shaft of the opening body; the other end of the main shaft of the opening body is connected to one end of the front hollow propulsion assembly; when the driving screw drives the rear hollow propulsion assembly to move from the tail end to the head end of the fusion body, the rear hollow propulsion assembly drives the main shaft of the opening body to move toward the head end of the fusion body, and the main shaft of the opening body slides relative to the front hollow propulsion assembly. It has a self-guided channel that can be inserted along a guidewire into the predetermined intervertebral position, reducing trauma and shortening surgical time. It can be expanded on all four sides, restoring intervertebral height while allowing for the maximum possible bone grafting, increasing the amount of grafted bone and the fusion rate. After expansion, the tail end is connected to a microscopic bone grafting sleeve, allowing for minimally invasive and precise microscopic bone grafting, depending on the amount of grafted bone. Although it can be expanded on all four sides, the shape of the expansion leaflets and the size of the fusion body chute limit its expandable volume, which cannot fully meet bone grafting requirements. At the same time, its size after folding is still large, which means that a larger incision is required for its implantation, which causes relatively greater pain to the patient and requires a longer time for the wound to heal.

[0005] A Chinese patent document with publication number CN112220510A discloses a minimally invasive vertebral body distractor, which includes a distraction device and a molding instrument for controlling the distraction of the distraction device. The distraction device includes a fixed block, a distraction block, and a push block. The fixed block and the push block are provided with limit blocks on their opposing surfaces. Through the limit blocks, the distraction block is provided with a series sliding limit between the fixed block and the push block. When the push block slides in a direction close to the fixed block, the distraction block is distracted upward and / or downward. It can pass through a surgical working channel with a diameter of less than 7mm, meeting the requirements of a minimally invasive surgical working channel. At the same time, because the middle block is in surface contact with the adjacent blocks, the structure is more stable, making the operation safer. However, the distraction volume is small, and the bone grafting space is limited.

[0006] Existing expandable intervertebral fusion devices have the following problems in actual use: those with large expandable spaces generally require placement through large channels, which cannot achieve true minimally invasive surgery; the expandable volume required for minimally invasive surgery is insufficient, which limits the space for bone grafting; and frame-type intervertebral fusion devices have poor stability when the expandable space is large. Summary of the Invention

[0007] The present invention provides a multi-dimensional three-dimensional expandable intervertebral fusion device, which overcomes the shortcomings of the above-mentioned existing technologies. It can effectively solve the problem that the existing expandable intervertebral fusion devices have a large expandable space and generally need to be placed through a large channel, which cannot achieve true minimally invasive surgery. The expandable volume that can meet the needs of minimally invasive surgery is insufficient, resulting in limited bone grafting space. It further solves the problem that the frame-type intervertebral fusion device has poor stability when its expandable space is large.

[0008] The technical solution of the present invention is achieved through the following measures: a multi-dimensional three-dimensional expansion intervertebral fusion device, including a sliding disc and a fixed disc, wherein the first support rod, the second support rod, the third support rod and the fourth support rod are hingedly connected along the circumference of the fixed disc, and the ends of the first support rod, the second support rod, the third support rod and the fourth support rod can form a rectangle, and the first support rod and the second support rod, the second support rod and the third support rod, the third support rod and the fourth support rod, and the fourth support rod and the first support rod are hingedly connected. A first support rod that can be folded and retracted outside the fixed column is hinged; a fixed column is fixedly installed in the middle of the upper side of the fixed disc, and a sliding disc is sleeved on the outer side of the upper end of the fixed column, and the sliding disc corresponding to the positions of the first support rod, the second support rod, the third support rod and the fourth support rod are respectively hinged. The fifth support rod, the sixth support rod, the seventh support rod and the eighth support rod are folded axially along the sliding disk, and the ends of the fifth support rod, the sixth support rod, the seventh support rod and the eighth support rod can form a rectangle, and the fifth support rod and the sixth support rod, the sixth support rod and the seventh support rod, the seventh support rod and the eighth support rod, and the eighth support rod and the fifth support rod are hinged with a second support rod that can be folded and retracted outside the handle; the fifth support rod and the first support rod, the sixth support rod and the second support rod, the seventh support rod and the third support rod, and the eighth support rod and the fourth support rod are hinged with connecting rods, and all the support rods, connecting rods and the first support rod and the second support rod can support a rectangular space when unfolded; a locking mechanism is provided between the fixed column and the sliding disk, and the inner side of the upper end of the fixed column is detachably connected to a handle with an upper end located above the sliding disk.

[0009] The following are further optimizations and / or improvements to the above technical solutions:

[0010] The above-mentioned may also include a first torsion spring and a second torsion spring. Four first mounting grooves with openings upward are provided at intervals along the circumference on the upper side of the fixed plate. The first support rod, the second support rod, the third support rod and the fourth support rod are respectively hinged in each first mounting groove through the first hinge axis. A first torsion spring is provided on the outer side of the first hinge axis corresponding to the positions between the first support rod, the second support rod, the third support rod, the fourth support rod and the corresponding first mounting groove; a second mounting groove with an opening downward is provided on the lower side of the sliding plate corresponding to the position of each first mounting groove, and a fifth support rod, a sixth support rod, a seventh support rod and an eighth support rod are respectively hinged in each second mounting groove through the second hinge axis. A second torsion spring is provided on the second hinge axis corresponding to the positions between the fifth support rod, the sixth support rod, the seventh support rod and the eighth support rod and the corresponding second mounting groove.

[0011] The above-mentioned first support rod may include a first reinforcing rod, a third torsion spring, a second reinforcing rod, a fourth torsion spring and a third reinforcing rod, and the front sides of the first support rod and the fourth support rod are respectively provided with a third mounting slot and a fourth mounting slot opening forward, the inner side of the left end of the third mounting slot is hinged to the left end of the first reinforcing rod through a third hinge shaft, and the first reinforcing rod is located in the third mounting slot after folding, and a third torsion spring is provided on the third hinge shaft corresponding to the position between the third mounting slot and the first reinforcing rod, the inner side of the right end of the fourth mounting slot is hinged to the right end of the second reinforcing rod through a fourth hinge shaft, and the second reinforcing rod is located in the fourth mounting slot after folding, and a fourth torsion spring is provided on the fourth hinge shaft corresponding to the position between the fourth mounting slot and the second reinforcing rod; the right end of the first reinforcing rod A fifth mounting groove is provided with an opening to the right and a spherical left end. A sixth mounting groove is provided at the left end of the second reinforcement rod corresponding to the position of the fifth mounting groove, and the left end of the second reinforcement rod is provided with a spherical right end. A third reinforcement rod is provided in the sixth mounting groove, and the left end and the right end of the third reinforcement rod are respectively provided with connecting balls that match the shapes of the left end of the fifth mounting groove and the right end of the sixth mounting groove; a seventh mounting groove is provided on the front side of the right end of the first reinforcement rod, which opens forward and is connected to the fifth mounting groove; an eighth mounting groove is provided on the front side of the left end of the second reinforcement rod, which opens forward and is connected to the sixth mounting groove; after folding, the left part of the third reinforcement rod is located in the seventh mounting groove and the right part is located in the eighth mounting groove; the structure of the second support rod is the same as that of the first support rod and is symmetrically distributed up and down.

[0012] The upper side of the first support rod corresponding to the right end position of the third mounting slot can be provided with a ninth mounting slot with an opening upward, and the lower side of the fifth support rod corresponding to the position of the ninth mounting slot can be provided with a tenth mounting slot with an opening downward; the upper side of the fourth support rod corresponding to the left end position of the fourth mounting slot can be provided with an eleventh mounting slot with an opening upward, and the lower side of the eighth support rod corresponding to the position of the ninth groove can be provided with a twelfth mounting slot with an opening downward.

[0013] The above-mentioned locking mechanism may include a pin shaft, a pressure cover and a spring. A first straight hole opening forward is provided at the upper end of the fixed column, and a second straight hole penetrating inside and outside is provided on the sliding plate corresponding to the position of the first straight hole. A pin shaft with a rear end located in the first straight hole is provided in the second straight hole; a pressure cover sleeved on the outside of the pin shaft is fixedly installed on the inner side of the front end of the second straight hole by means of threads, an outer ring platform is provided on the outside of the pin shaft corresponding to the front side position of the first straight hole, and a spring is sleeved on the outside of the pin shaft corresponding to the position between the outer ring platform and the pressure cover.

[0014] The outer side of the upper end of the handle may be provided with an anti-slip layer.

[0015] The rectangular space may have a length of 15-20 mm, a width of 7-10 mm, and a height of 8-11 mm.

[0016] The present invention has a reasonable and compact structure and is easy to use. The device can be implanted into a predetermined intervertebral position through a surgical working channel with a diameter of less than 5 mm. There is no need to expand the channel during the operation, which can reduce the wound and reduce muscle tissue separation. The simple deployment and fixation methods greatly shorten the operation time. A rectangular space is supported by all the support rods and connecting rods, which greatly increases the bone grafting space and increases the fusion rate. Through the arrangement of the first support rod and the second support rod, a more stable triangular support structure can be formed between the first support rod, the second support rod, the third support rod and the fourth support rod, and between the fifth support rod, the sixth support rod, the seventh support rod and the eighth support rod, so as to increase the connection strength and stability between the support rods in the rectangular space, so that the unstable rectangular frame structure is transformed into a stable rectangular frame structure, and the rectangular frame is prevented from being squeezed and deformed. In addition, after the device is implanted, the bone grafting operation can be realized under direct vision through the endoscope, thereby achieving precise bone grafting and controlling the amount of bone grafting. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Attachment Figure 1 It is a schematic diagram of the main structure of the best embodiment of the present invention.

[0018] Attachment Figure 2 This is a schematic diagram of the three-dimensional structure of the best embodiment of the present invention in the unfolded state.

[0019] Attachment Figure 3 This is a schematic diagram of the three-dimensional structure of the best embodiment of the present invention in a folded state.

[0020] Attachment Figure 4 For attachment Figure 1 Schematic diagram of the three-dimensional structure with an enlarged view of the connection state of the fixed plate and the fixed column.

[0021] Attachment Figure 5 For attachment Figure 1 Schematic diagram of the structure showing the enlarged connection state of the locking mechanism in section AA.

[0022] Attachment Figure 6 For attachment Figure 1 Schematic diagram of the three-dimensional structure showing the enlarged connection state of the fourth support rod and the fixed plate.

[0023] Attachment Figure 7 For attachment Figure 1 Schematic diagram of the three-dimensional structure of the enlarged connection state of the fourth support rod and the first support rod.

[0024] The codes in the accompanying drawings are: 1 is a sliding plate, 2 is a fixed plate, 3 is a first support rod, 4 is a second support rod, 5 is a third support rod, 6 is a fourth support rod, 7 is a fixed column, 8 is a fifth support rod, 9 is a sixth support rod, 10 is a seventh support rod, 11 is an eighth support rod, 12 is a connecting rod, 13 is a handle, 14 is a first torsion spring, 15 is a second torsion spring, 16 is a first mounting groove, 17 is a first hinge shaft, 18 is a second mounting groove, 19 is a second hinge shaft, 20 is a first reinforcing rod, 21 is a third torsion spring , 22 is the second reinforcement rod, 23 is the fourth torsion spring, 24 is the third reinforcement rod, 25 is the third mounting slot, 26 is the fourth mounting slot, 27 is the third hinge shaft, 28 is the fourth hinge shaft, 29 is the connecting ball, 30 is the seventh mounting slot, 31 is the eighth mounting slot, 32 is the ninth mounting slot, 33 is the tenth mounting slot, 34 is the eleventh mounting slot, 35 is the twelfth mounting slot, 36 is the pin shaft, 37 is the pressure cover, 38 is the spring, 39 is the outer ring platform, 40 is the anti-slip layer, and 41 is the first straight hole. DETAILED DESCRIPTION

[0025] The present invention is not limited to the following embodiments, and specific implementation methods can be determined based on the technical solutions of the present invention and actual conditions.

[0026] In the present invention, for the convenience of description, the relative position relationship of each component is described based on the Figure 1 For example, the positional relationships of front, back, up, down, left, and right are determined according to the layout directions of the drawings in the specification.

[0027] The present invention will be further described below in conjunction with the embodiments and accompanying drawings:

[0028] As attached Figure 1 、 2As shown in , 3, 4, 5, 6, and 7, the multi-dimensional three-dimensional open intervertebral fusion device includes a sliding disc 1 and a fixed disc 2, and the fixed disc 2 is respectively hinged with a first support rod 3, a second support rod 4, a third support rod 5 and a fourth support rod 6 that can be folded axially along the fixed disc 2 at intervals along the circumference, and the ends of the first support rod 3, the second support rod 4, the third support rod 5 and the fourth support rod 6 can form a rectangle, and a first support rod that can be folded and retracted outside the fixed column 7 is hinged between the first support rod 3 and the second support rod 4, the second support rod 4 and the third support rod 5, the third support rod 5 and the fourth support rod 6, and the fourth support rod 6 and the first support rod 3; a fixed column 7 is fixedly installed on the middle part of the upper side of the fixed disc 2, and the sliding disc 1 is mounted on the outer side of the upper end of the fixed column 7, and the fifth support rod that can be folded axially along the sliding disc 1 is respectively hinged on the sliding disc 1 corresponding to the positions of the first support rod 3, the second support rod 4, the third support rod 5 and the fourth support rod 6. The support rod 8, the sixth support rod 9, the seventh support rod 10 and the eighth support rod 11, and the ends of the fifth support rod 8, the sixth support rod 9, the seventh support rod 10 and the eighth support rod 11 can form a rectangle, and the fifth support rod 8 and the sixth support rod 9, the sixth support rod 9 and the seventh support rod 10, the seventh support rod 10 and the eighth support rod 11, and the eighth support rod 11 and the fifth support rod 8 are all hinged with a second support rod that can be folded and retracted outside the handle; the fifth support rod 8 and the first support rod 3, the sixth support rod 9 and the second support rod 4, the seventh support rod 10 and the third support rod 5, the eighth support rod 11 and the fourth support rod 6 are all hinged with a connecting rod 12, and all the support rods, the connecting rod 12 and the first support rod and the second support rod can support a rectangular space when unfolded; a locking mechanism is provided between the fixed column 7 and the sliding disk 1, and the inner side of the upper end of the fixed column 7 is detachably connected to a handle 13 with the upper end located above the sliding disk 1. According to requirements, all the support rods and connecting rods 12 can support a rectangular space after being unfolded. The locking mechanism can effectively prevent the sliding plate 1 from sliding up and down and causing deformation of the rectangular space. The locking mechanism can be a spring latch, a spring-loaded ball plunger, or a snap assembly that can achieve automatic locking in the prior art. The first and second support rods should be able to fold and retract axially along the fixed axis and the handle 13. Therefore, the first and second support rods can be realized by a flexible shaft, a rigid connecting rod and a flexible shaft or a steel wire assembly, or a rigid connecting rod hinge assembly. The handle 13 should be easy to disassemble. Therefore, the fixed column 7 and the handle 13 can be detachably connected by a threaded connection, a ball plunger, a rotary snap connection, or a snap connection. Through this arrangement, a stable triangular support can be formed between the first support rod 3, the second support rod 4, the third support rod 5, the fourth support rod 6 and the corresponding first support rod, and between the fifth support rod 8, the sixth support rod 9, the seventh support rod 10, and the eighth support rod 11 and the corresponding second support rod. This can enhance the stability of the rectangular space support frame and prevent the rectangular space support frame from being squeezed and deformed.

[0029] During use, when the intervertebral treatment is completed and the intervertebral fusion device is ready to be placed, the folded device is placed in the predetermined position through the surgical working channel, and the locking mechanism is unlocked with the tip of the tweezers. Then, the handle 13 is held and the sliding plate 1 is pushed with the tip of the tweezers to slowly slide down along the surface of the handle 13 until all the support rods, connecting rods 12, first support rods and second support rods are fully unfolded to form a rectangular space. At this time, the sliding plate 1 is mounted on the outer side of the upper end of the fixed column 7, and the sliding plate 1 is locked to the outer side of the upper end of the fixed column 7 through the locking mechanism. Finally, the handle 13 is removed to complete the implantation of the device; minimally invasive and precise bone grafting can be performed subsequently according to the intervertebral height. The present invention has a reasonable and compact structure. The device can be implanted into a predetermined position between vertebrae through a surgical working channel with a diameter of less than 5 mm. There is no need to expand the channel during the operation, which can reduce the incision and reduce muscle tissue separation. The deployment and fixation methods are simple and the operation time is greatly shortened. A stable rectangular space is supported by all the support rods, the connecting rod 12, the first support rod and the second support rod, which greatly increases the bone grafting space and the fusion rate. In addition, after the device is implanted, the bone grafting operation can be realized under direct vision through the endoscope, and precise bone grafting and control of the bone grafting amount can be performed.

[0030] The above-mentioned multi-dimensional three-dimensional expansion intervertebral fusion cage can be further optimized and / or improved according to actual needs:

[0031] As attached Figure 1 、 2, 3, and 6, it also includes a first torsion spring 14 and a second torsion spring 15. Four first mounting grooves 16 with an upward opening are provided on the upper side of the fixed plate 2 at intervals along the circumference. The first support rod 3, the second support rod 4, the third support rod 5, and the fourth support rod 6 are respectively hinged in each first mounting groove 16 through a first hinge shaft 17. A first torsion spring 14 is provided on the outside of the first hinge shaft 17 corresponding to the position between the first support rod 3, the second support rod 4, the third support rod 5, the fourth support rod 6 and the corresponding first mounting groove 16; a second mounting groove 18 with a downward opening is provided on the lower side of the sliding plate 1 corresponding to the position of each first mounting groove 16, and a fifth support rod 8, a sixth support rod 9, a seventh support rod 10, and an eighth support rod 11 are respectively hinged in each second mounting groove 18 through a second hinge shaft 19. A second torsion spring 15 is provided on the second hinge shaft 19 corresponding to the position between the fifth support rod 8, the sixth support rod 9, the seventh support rod 10, the eighth support rod 11 and the corresponding second mounting groove 18. Through such an arrangement, the first mounting groove 16 and the second mounting groove 18 can make the maximum expansion angle of all the struts after expansion to 90°, thereby limiting the expansion angle of all the struts; through the arrangement of the first torsion spring 14 and the second torsion spring 15, the expansion speed of all the struts can be accelerated and the anti-extrusion performance of the rectangular space can be enhanced, which can better prevent the rectangular space from being squeezed and deformed; in addition, by arranging the first mounting groove 16 and the second mounting groove 18, after all the struts and connecting rods 12 are folded and retracted, the maximum outer diameter of the device is the maximum outer diameter of the fixed disk 2 or the sliding disk 1, so that the maximum radial dimension of the device after folding can be better designed and controlled, so that the device can be implanted in the predetermined position between vertebrae through a smaller surgical channel.

[0032] As attached Figure 1 、 2As shown in , 3 and 7, the first support rod includes a first reinforcement rod 20, a third torsion spring 21, a second reinforcement rod 22, a fourth torsion spring 23 and a third reinforcement rod 24. The front sides of the first support rod 3 and the front sides of the fourth support rod 6 are respectively provided with a third mounting groove 25 and a fourth mounting groove 26 opening forward. The inner side of the left end of the third mounting groove 25 is hinged to the left end of the first reinforcement rod 20 through a third hinge shaft 27, and the first reinforcement rod 20 is located in the third mounting groove 25 after folding. A third torsion spring 21 is provided on the third hinge shaft 27 corresponding to the position between the third mounting groove 25 and the first reinforcement rod 20. The inner side of the right end of the fourth mounting groove 26 is hinged to the right end of the second reinforcement rod 22 through a fourth hinge shaft 28, and the second reinforcement rod 22 is located in the fourth mounting groove 26 after folding. The fourth hinge shaft 28 corresponding to the position between the fourth mounting groove 26 and the second reinforcement rod 22 A fourth torsion spring 23 is provided; a fifth mounting groove opening to the right and having a spherical left end is provided at the right end of the first reinforcement rod 20, and a sixth mounting groove opening to the left and having a spherical right end is provided at the left end of the second reinforcement rod 22 corresponding to the position of the fifth mounting groove, and a third reinforcement rod 24 with a left end located in the fifth mounting groove is provided in the sixth mounting groove, and the left end and the right end of the third reinforcement rod 24 are respectively provided with connecting balls 29 that match the shapes of the left end of the fifth mounting groove and the right end of the sixth mounting groove; a seventh mounting groove 30 opening forward and connected to the fifth mounting groove is provided on the front side of the right end of the first reinforcement rod 20, and an eighth mounting groove 31 opening forward and connected to the sixth mounting groove is provided on the front side of the left end of the second reinforcement rod 22. After folding, the left part of the third reinforcement rod 24 is located in the seventh mounting groove 30 and the right part is located in the eighth mounting groove 31; the structure of the second support rod is the same as that of the first support rod and is symmetrically distributed up and down. By setting the third mounting groove 25 and the fourth mounting groove 26, the first reinforcement rod 20 and the second reinforcement rod 22 can be better folded and stored outside the fixed axis after being hinged together by the connecting balls 29 at both ends of the third reinforcement rod 24, but when the first reinforcement rod 20, the second reinforcement rod 22 and the third reinforcement rod 24 are unfolded, they can form a rigid support rod, and the rigid support rod has a better supporting effect than the flexible support rod and is less likely to deform after being squeezed; the third torsion spring 21 and the fourth torsion spring 23 can better control the unfolding angle and unfolding direction of the first reinforcement rod 20 and the second reinforcement rod 22.

[0033] As attached Figure 2 、 6As shown, a ninth mounting groove 32 opening upward is provided on the upper side of the first support rod 3 at the right end of the third mounting groove 25, and a tenth mounting groove 33 opening downward is provided on the lower side of the fifth support rod 8 at the position of the ninth mounting groove 32. An eleventh mounting groove 34 opening upward is provided on the upper side of the fourth support rod 6 at the left end of the fourth mounting groove 26, and a twelfth mounting groove 35 opening downward is provided on the lower side of the eighth support rod 11 at the position of the ninth groove. With this arrangement, after folding, the third reinforcing rod 24 on the first support rod can be partially recessed into the ninth mounting groove 32 at the position corresponding to the first support rod 3, and partially recessed into the eleventh mounting groove 34 at the position corresponding to the fourth support rod 6, thereby allowing the third reinforcing rod 24 on the first support rod to be better folded outside the fixing column 7. After folding, the third reinforcing rod 24 on the second support rod can be partially recessed into the tenth mounting groove 33 at the position corresponding to the fifth support rod 8, and partially recessed into the twelfth groove at the position corresponding to the eighth support rod 11, thereby allowing the third reinforcing rod 24 on the second support rod to be fully folded outside the handle 13.

[0034] As attached Figure 1 、 2 As shown in Figures 3 and 5, the locking mechanism includes a pin 36, a pressure cover 37 and a spring 38. A first straight hole 41 opening forward is provided at the upper end of the fixed column 7. A second straight hole extending inside and outside is provided on the sliding disk 1 corresponding to the position of the first straight hole 41. The second straight hole is provided with a pin 36 with a rear end located in the first straight hole 41. A pressure cover 37 sleeved on the outside of the pin 36 is fixedly installed on the inner side of the front end of the second straight hole by means of threads. An outer ring platform 39 is provided on the outside of the pin 36 corresponding to the front side of the first straight hole 41. A spring 38 is sleeved on the outside of the pin 36 corresponding to the position between the outer ring platform 39 and the pressure cover 37. With this arrangement, when the first support rod 3, the second support rod 4, the third support rod 5, the fourth support rod 6, the fifth support rod 8, the sixth support rod 9, the seventh support rod 10, the eighth support rod 11, and all the connecting rods 12 are unfolded to form a rectangular space, the inner end of the pin 36 can be inserted into the first straight hole 41 under the action of the spring preload, thereby preventing the sliding disk 1 from sliding up and down and preventing the rectangular space from being squeezed and deformed. The pressure cover 37 can prevent the spring 38 and the pin 36 from escaping from the second straight hole. As required, the spring 38 can be a compression spring, a combination compression spring, or a combination disc spring in the prior art. After the device is folded, a locking groove can be provided at a corresponding position on the handle 13 to prevent the device from automatically unfolding under the spring force of the first torsion spring 14 and the second torsion spring 15. The outer end of the pressure cover 37 can also be provided with a wrench slot to facilitate its installation, and the outer end of the pin 36 can be provided with a threaded wrench slot with an outward opening to facilitate unlocking with a wrench if the locking mechanism is stuck.

[0035] As attached Figure 1 、 23, the outer side of the upper end of the handle 13 is provided with an anti-slip layer 40. According to demand, in order to prevent slipping when grasping the handle 13, the outer side of the upper end of the handle 13 can be provided with an embossed or knurled anti-slip layer, a frosted anti-slip layer, or a soft rubber anti-slip material anti-slip layer.

[0036] As attached Figure 1 、 2 As shown in FIG3 , the length of the rectangular space is 15-20 mm, the width is 7-10 mm, and the height is 8-11 mm. By setting this configuration, a series of devices with different space sizes can be set up, making it convenient to use different sizes of devices for different patients.

[0037] The above technical features constitute the best embodiment of the present invention, which has strong adaptability and best implementation effect. Non-essential technical features can be added or removed according to actual needs to meet the requirements of different situations.

Claims

1. A multi-dimensional three-dimensional intervertebral fusion cage, characterized in that The foldable handle is hinged on the outer cover of the cam, and the hinged handle is hinged on the outer cover of the cam, so that the cam can be folded and locked in the camshaft at the bottom end of the cam. The sliding plate is respectively hinged with a fifth support rod, a sixth support rod, a seventh support rod and an eighth support rod that can be folded along the axial direction of the sliding plate, and the ends of the fifth support rod, the sixth support rod, the seventh support rod and the eighth support rod can form a rectangle, and the fifth support rod and the sixth support rod, the sixth support rod and the seventh support rod, the seventh support rod and the eighth support rod, and the eighth support rod and the fifth support rod are each hinged with a second support rod that can be folded and retracted outside the handle; the fifth support rod and the first support rod, the sixth support rod and the second support rod, the seventh support rod and the third support rod, and the eighth support rod and the fourth support rod are each hinged with a connecting rod, and when all the support rods, the connecting rods and the first support rod and the second support rod are unfolded, they can support a rectangular space, and the length of the rectangular space is 15-20 mm, the width is 7-10 mm, and the height is 8-11 mm; A locking mechanism is provided between the fixed column and the sliding plate, and the locking mechanism includes a pin, a pressure cover, and a spring. A first straight hole opening forward is provided at the upper end of the fixed column, and a second straight hole extending through the inside and outside is provided on the sliding plate corresponding to the position of the first straight hole. A pin with a rear end located in the first straight hole is provided in the second straight hole; a pressure cover sleeved on the outside of the pin is fixedly installed on the inner side of the front end of the second straight hole by means of a thread; an outer ring platform is provided on the outside of the pin corresponding to the position in front of the first straight hole, and a spring is sleeved on the outside of the pin corresponding to the position between the outer ring platform and the pressure cover; Four first mounting grooves with upward openings are provided at intervals along the circumference on the upper side of the fixed plate, and the first support rod, the second support rod, the third support rod and the fourth support rod are hinged to each other through the first hinge axis in each first mounting groove, and a first torsion spring is provided on the outer side of the first hinge axis corresponding to the positions between the first support rod, the second support rod, the third support rod, the fourth support rod and the corresponding first mounting groove; a second mounting groove with downward opening is provided on the lower side of the sliding plate corresponding to the position of each first mounting groove, and a fifth support rod, a sixth support rod, a seventh support rod and an eighth support rod are hinged to each second mounting groove through the second hinge axis, and a second torsion spring is provided on the second hinge axis corresponding to the positions between the fifth support rod, the sixth support rod, the seventh support rod and the eighth support rod and the corresponding second mounting groove.

2. The multi-dimensional three-dimensional expansion intervertebral fusion cage according to claim 1 is characterized in that The first support rod comprises a first reinforcing rod, a third torsion spring, a second reinforcing rod, a fourth torsion spring and a third reinforcing rod, and the front sides of the first support rod and the fourth support rod are respectively provided with a third mounting slot and a fourth mounting slot opening forward, the inner side of the left end of the third mounting slot is hinged to the left end of the first reinforcing rod through a third hinge shaft, and the first reinforcing rod is located in the third mounting slot after folding, and a third torsion spring is provided on the third hinge shaft corresponding to the position between the third mounting slot and the first reinforcing rod, and the inner side of the right end of the fourth mounting slot is hinged to the right end of the second reinforcing rod through a fourth hinge shaft, and the second reinforcing rod is located in the fourth mounting slot after folding, and a fourth torsion spring is provided on the fourth hinge shaft corresponding to the position between the fourth mounting slot and the second reinforcing rod; the right end of the first reinforcing rod is provided with A fifth mounting slot is provided which opens to the right and has a spherical left end. A sixth mounting slot is provided on the left end of the second reinforcement rod corresponding to the position of the fifth mounting slot, and the left end of the second reinforcement rod is provided with a spherical right end. A third reinforcement rod is provided in the sixth mounting slot, and the left end and the right end of the third reinforcement rod are respectively provided with connecting balls that match the shapes of the left end of the fifth mounting slot and the right end of the sixth mounting slot; a seventh mounting slot is provided on the front side of the right end of the first reinforcement rod, which opens forward and is connected to the fifth mounting slot; an eighth mounting slot is provided on the front side of the left end of the second reinforcement rod, which opens forward and is connected to the sixth mounting slot; after folding, the left part of the third reinforcement rod is located in the seventh mounting slot and the right part is located in the eighth mounting slot; the structure of the second support rod is the same as that of the first support rod and they are symmetrically distributed up and down.

3. The multi-dimensional three-dimensional expansion intervertebral fusion cage according to claim 2 is characterized in that A ninth mounting slot with an upward opening is provided on the upper side of the first support rod corresponding to the right end position of the third mounting slot, and a tenth mounting slot with an downward opening is provided on the lower side of the fifth support rod corresponding to the position of the ninth mounting slot; an eleventh mounting slot with an upward opening is provided on the upper side of the fourth support rod corresponding to the left end position of the fourth mounting slot, and a twelfth mounting slot with an downward opening is provided on the lower side of the eighth support rod corresponding to the position of the ninth groove.

4. The multi-dimensional expansion intervertebral fusion cage according to claim 1, 2 or 3, characterized in that An anti-slip layer is provided on the outer side of the upper end of the handle.

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