Expandable intervertebral fusion cage

Abstract

The present invention relates to the technical field of intervertebral fusion devices, and specifically to an expandable intervertebral fusion device; it includes a fusion device body, and expansion blocks are installed at the upper and lower ends of the fusion device body; the fusion device body includes a front end head and a rear end head; the present invention sets a combination frame, a wire rope and a tightening spring, so that when the winding unit winds up the wire rope on one side, the wire rope will pull the front end head close to the rear end head, so that the distance between the front end head and the rear end head is reduced, so that the combination frame on the side where the stretched wire rope is located squeezes the tightening spring and approaches each other; the combination frame is bent toward the side where the stretched wire rope is located, so that the geometric shape of the overall structure of the fusion device body naturally tends to form an arc under the action of tension to achieve force balance; it is convenient for doctors to adjust the angle and position of the fusion device, enhance its fit with the patient's vertebral body, reduce the need to replace the fusion device, shorten the operation time, and thus improve the patient's postoperative recovery effect.

Description

Technical Field

[0001] The present invention relates to the technical field of intervertebral fusion cages, in particular to an expandable intervertebral fusion cage. Background Art

[0002] An intervertebral fusion cage is a medical device used in spinal surgery, primarily for the treatment of degenerative disc disease, spinal instability, or other spinal-related problems. Its primary function is to restore the structure and function of the spine by providing stable support and promoting bone healing. Based on the materials used, the cage can be divided into metal and non-metal types. Metal cages are primarily titanium alloys, while non-metal cages come in many varieties, including bio-based cages and composite materials (such as carbon fiber and polyetheretherketone).

[0003] Existing intercone fusion cages come in a variety of shapes. This is partly due to individual differences in spinal anatomy (specifically, individual bone development, including characteristics such as the shape, size, and curvature of the spine). Surgeons choose the appropriate cage shape to ensure optimal fit and minimize damage to surrounding tissues. Furthermore, intercone fusion cages of different shapes exhibit varying mechanical properties. For example, curved cages better disperse loads, while Type I cages perform better when linear support is required.

[0004] Although during preoperative evaluation, doctors will consider factors such as the patient's condition type, spinal curvature, and vertebral size to select the appropriate size and shape of the fusion cage, the actual vertebral anatomy often differs significantly from the expected structure. Therefore, doctors need to dynamically adjust the shape of the selected fusion cage based on the observed spinal condition to ensure surgical effectiveness and patient safety. Adjusting and replacing fusion cages of different shapes and sizes will increase the total time of the operation and lead to a prolonged postoperative recovery time.

[0005] In view of this, in order to overcome the above technical problems, the present invention proposes an expandable intervertebral fusion cage to solve the above technical problems. Summary of the Invention

[0006] In order to make up for the shortcomings of the existing technology, the present invention proposes an expandable intervertebral fusion device. The present invention sets a combination frame, a wire rope and a tightening spring, so that when the winding unit winds up the wire rope on one side, the wire rope will pull the front end head close to the rear end head, so that the distance between the front end head and the rear end head is reduced, so that the combination frame on the side where the stretched wire rope is located squeezes the tightening spring and approaches each other; the combination frame is bent toward the side where the stretched wire rope is located, so that the geometric shape of the overall structure of the fusion device body naturally tends to form an arc under the action of tension to achieve force balance; it is convenient for the doctor to adjust the angle and position of the fusion device, enhance its fit with the patient's vertebral body, reduce the need to replace the fusion device, shorten the operation time, and thus improve the patient's postoperative recovery effect.

[0007] The technical solution adopted by the present invention to solve the technical problem is as follows: the expandable intervertebral fusion cage of the present invention comprises a fusion cage body, wherein the upper end and the lower end of the fusion cage body are both equipped with expansion blocks;

[0008] The fusion device body includes a front end head and a rear end head; a combination frame is provided between the front end head and the rear end head; the combination frame close to the front end head and the rear end head is fixedly connected to the front end head and the rear end head; two adjacent combination frames are fixedly connected by a bellows; a circular groove is provided on the surface of the combination frame; a push rod fixedly connected to the expansion block is slidably connected in the circular groove; a support plate is provided between the front end head and the rear end head; the support plate is located in the combination frame; the number of the support plates is provided with two; the two support plates are distributed up and down; the sides of the two support plates away from each other are fixedly connected to the adjacent push rods; a pushing unit is provided between the two support plates; the pushing unit is used to push the two support plates away from each other;

[0009] A titanium alloy wire is arranged between the front end head and the rear end head; one end of the titanium alloy wire is fixedly connected to the front end head, and the other end passes through the combination frame and is fixedly connected to the rear end head; a winding unit is installed on the outer surface of the rear end head; the winding unit is used to wind the titanium alloy wire; a tightening spring is sleeved on the surface of the titanium alloy wire; the tightening spring is located between two adjacent combination frames.

[0010] Preferably, the pushing unit includes a screw rod and a screw barrel; there are two screw barrels; the two screw barrels are rotatably connected to the front end head and the rear end head respectively; the screw rod is spirally connected to the screw barrel; the end of the screw rod away from the screw barrel is hinged to the support plate; a worm gear ring is fixedly connected to the surface of the screw barrel; a worm engaged with the worm gear ring is provided on one side of the worm gear ring; the two worms are rotatably connected to the front end head and the rear end head respectively; the outer wall of the rear end head is rotatably connected to a rotating rod; the rotating rod and the worm are connected through a transmission unit.

[0011] Preferably, the transmission unit includes a bevel gear ring and a bevel gear shaft; the bevel gear ring is fixedly connected to the worm near the rear end head; the bevel gear shaft is rotatably connected to the rear end head; one end of the worm near the front end head is fixedly connected with a metal rope; the metal rope is made of titanium alloy material; the side of the rotating rod away from the bevel gear shaft is rotatably connected with a straight rod; the end of the metal rope away from the worm is fixedly connected to the straight rod; the rotating rod, the straight rod and the bevel gear shaft are meshed and transmitted through a gear set.

[0012] Preferably, the gear set includes a spur gear ring; the spur gear ring is fixedly connected to the rotating rod; gear plates are provided on both sides of the spur gear ring; the two gear plates are respectively fixedly connected to the bevel gear shaft and the straight rod; a groove is provided on the surface of the gear plate; a pawl is provided in the groove; the pawl is rotationally connected to the groove wall through a torsion spring.

[0013] Preferably, the winding unit includes a winding roller; a cylindrical groove is opened on the outer surface of the rear end head; the winding roller is rotatably connected in the cylindrical groove; one end of the titanium alloy wire is fixedly connected to the front end head, and the other end passes through the combination frame and is fixedly connected to the winding roller; there are two winding rollers; the two winding rollers are distributed on both sides of the rotating rod.

[0014] Preferably, a support spring is provided between the winding roller and the bottom of the cylindrical groove; one end of the support spring is fixedly connected to the bottom of the cylindrical groove, and the other end is rotatably connected to the winding roller; a bevel gear ring is fixedly connected to the surface of the winding roller; and the cavity wall of the cylindrical groove is fixedly connected to meshing teeth that engage with the bevel gear ring.

[0015] Preferably, the support plate includes a U-shaped plate and a hinged rod; two U-shaped plates are provided; the two U-shaped plates are respectively connected to the front end head and the rear end head through a push rod; the hinged rod is located between the two U-shaped plates and is hinged to the U-shaped plates; the push rod close to the hinged rod is fixedly connected to the hinged rod.

[0016] Preferably, rectangular grooves are provided at both ends of the hinged rod; hinge joints are slidably connected in the rectangular grooves; the hinged rod is hinged to the front end and the rear end through the hinge joints; and two adjacent hinged rods are hinged through the hinge joints.

[0017] The beneficial effects of the present invention are as follows:

[0018] 1. The present invention sets a combination frame, a steel wire rope and a holding spring, so that when the winding unit winds up the steel wire rope on one side, the steel wire rope will pull the front end head close to the rear end head, so that the distance between the front end head and the rear end head is reduced, so that the combination frame on the side where the stretched steel wire rope is located squeezes the holding spring and approaches each other; the combination frame is bent toward the side where the stretched steel wire rope is located, so that the geometric shape of the overall structure of the fusion device body naturally tends to form an arc under the action of tension to achieve force balance; it is convenient for the doctor to adjust the angle and position of the fusion device, enhance its fit with the patient's vertebral body, reduce the need to replace the fusion device, shorten the operation time, and thus improve the patient's postoperative recovery effect.

[0019] 2. The present invention sets two spiral cylinders so that the two spiral cylinders can push the two ends of the support plate close to the front end and the rear end to rise and fall respectively through the spiral rod, so that the support plate pushes the expansion block to rise to inconsistent heights, so that the inconsistent lifting and lowering of the expansion blocks at both ends can adjust the vertebrae with different cone gaps to different amplitudes to correct the position and angle of the vertebrae; balance the pressure distribution between the intervertebral gaps, and then help correct the natural curvature of the spine, make it more in line with the physiological state, and improve the stability and function of the spine. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0021] Figure 1 is a perspective view of the present invention;

[0022] Figure 2 It is a structural schematic diagram of the present invention;

[0023] Figure 3 yes Figure 2 Enlarged view of point A in the middle;

[0024] Figure 4 yes Figure 2 Enlarged view of point B in the middle;

[0025] Figure 5 It is a structural schematic diagram of the front end used in the present invention;

[0026] Figure 6 is a perspective view of a combination frame used in the present invention;

[0027] Figure 7 It is a structural diagram of the rear end head used in the present invention;

[0028] Figure 8 yes Figure 7 Enlarged view of point C in the middle;

[0029] In the figure: 1. Fusion device body; 11. Expansion block; 111. Circular groove; 112. Push rod; 12. Front end head; 13. Rear end head; 14. Combination frame; 141. Bellows; 15. Titanium alloy wire; 151. Clamping spring; 16. Winding roller; 161. Cylindrical groove; 162. Support spring; 163. Bevel gear ring; 164. Meshing teeth; 2. Support plate; 21. Screw rod; 22. Screw barrel; 221. Worm gear ring; 222. Worm; 23. Rotating rod; 231. Bevel gear ring; 24. Bevel gear shaft; 25. Metal rope; 251. Straight rod; 26. Spur gear ring; 27. Gear plate; 271. Groove; 272. Ratchet; 28. U-shaped plate; 281. Articulated rod; 282. Rectangular groove; 283. Articulated head. DETAILED DESCRIPTION

[0030] In order to make the technical means, creative features, objectives and effects achieved by the present invention easier to understand, the present invention is further described below in conjunction with specific implementation methods.

[0031] like Figures 1 to 8 As shown, the expandable intervertebral fusion cage of the present invention comprises a cage body 1, and expansion blocks 11 are installed at both the upper and lower ends of the cage body 1;

[0032] The fusion device body 1 includes a front end head 12 and a rear end head 13; a combination frame 14 is provided between the front end head 12 and the rear end head 13; the combination frame 14 close to the front end head 12 and the rear end head 13 is fixedly connected to the front end head 12 and the rear end head 13; two adjacent combination frames 14 are fixedly connected by a bellows 141; a circular groove 111 is provided on the surface of the combination frame 14; a pushing rod 112 fixedly connected to the expansion block 11 is slidably connected in the circular groove 111; a support plate 2 is provided between the front end head 12 and the rear end head 13; the support plate 2 is located in the combination frame 14; the number of the support plates 2 is provided with two; the two support plates 2 are distributed up and down; the side of the two support plates 2 away from each other is fixedly connected to the adjacent pushing rod 112; a pushing unit is provided between the two support plates 2; the pushing unit is used to push the two support plates 2 away from each other;

[0033] A titanium alloy wire 15 is arranged between the front end head 12 and the rear end head 13; one end of the titanium alloy wire 15 is fixedly connected to the front end head 12, and the other end passes through the combination frame 14 and is fixedly connected to the rear end head 13; a winding unit is installed on the outer surface of the rear end head 13; the winding unit is used to wind the titanium alloy wire 15; a tightening spring 151 is sleeved on the surface of the titanium alloy wire 15; the tightening spring 151 is located between two adjacent combination frames 14.

[0034] As an embodiment of the present invention, the pushing unit includes a screw rod 21 and a screw barrel 22; the screw barrel 22 is provided with two; the two screw barrels 22 are respectively rotatably connected to the front end head 12 and the rear end head 13; the screw rod 21 is spirally transmitted to the screw barrel 22; the end of the screw rod 21 away from the screw barrel 22 is hinged to the support plate 2; a worm gear ring 221 is fixedly connected to the surface of the screw barrel 22; a worm 222 engaged with the worm gear ring 221 is provided on one side of the worm gear ring 221; the two worms 222 are respectively rotatably connected to the front end head 12 and the rear end head 13; the outer wall of the rear end head 13 is rotatably connected to the rotating rod 23; the rotating rod 23 and the worm 222 are connected through a transmission unit.

[0035] As an embodiment of the present invention, the transmission unit includes a bevel gear ring 231 and a bevel gear shaft 24; the bevel gear ring 231 is fixedly connected to the worm 222 near the rear end head 13; the bevel gear shaft 24 is rotatably connected to the rear end head 13; one end of the worm 222 near the front end head 12 is fixedly connected to a metal rope 25; the metal rope 25 is made of titanium alloy material; the side of the rotating rod 23 away from the bevel gear shaft 24 is rotatably connected to a straight rod 251; the end of the metal rope 25 away from the worm 222 is fixedly connected to the straight rod 251; the rotating rod 23, the straight rod 251 and the bevel gear shaft 24 are meshed and transmitted through a gear set.

[0036] As an embodiment of the present invention, the gear set includes a spur gear ring 26; the spur gear ring 26 is fixedly connected to the rotating rod 23; a gear plate 27 is provided on both sides of the spur gear ring 26; the two gear plates 27 are respectively fixedly connected to the bevel gear shaft 24 and the straight rod 251; a groove 271 is formed on the surface of the gear plate 27; a pawl 272 is provided in the groove 271; the pawl 272 is rotationally connected to the groove wall of the groove 271 via a torsion spring;

[0037] Before lumbar spine surgery, doctors consider factors such as the patient's condition, spinal curvature, and vertebral size to select a fusion cage of appropriate size and shape. However, the actual vertebral anatomy often differs significantly from expectations, requiring doctors to dynamically adjust the shape of the selected fusion cage based on the observed spinal condition to ensure surgical effectiveness and patient safety. Adjusting and replacing fusion cages of different shapes and sizes increases the total duration of the surgery and prolongs postoperative recovery.

[0038] To this end, the present invention provides a combination frame 14, a steel wire rope, and a holding spring 151, so that when the winding unit winds up the steel wire rope on one side, the steel wire rope will pull the front end head 12 close to the rear end head 13, so that the distance between the front end head 12 and the rear end head 13 is reduced, so that the combination frame 14 on the side where the stretched steel wire rope is located squeezes the holding spring 151 and approaches each other; the combination frame 14 is bent toward the side where the stretched steel wire rope is located, so that the geometric shape of the overall structure of the fusion device body 1 naturally tends to form an arc under the action of tension to achieve force balance; it is convenient for the doctor to adjust the angle and position of the fusion device, enhance its fit with the patient's vertebral body, reduce the need for replacement of the fusion device, shorten the operation time, and thus improve the patient's postoperative recovery effect;

[0039] Before the operation, the doctor will perform general anesthesia or spinal anesthesia on the patient. The doctor will then mark the surgical incision location on the patient's spine, disinfect the incision, and make it so that the incision location can expose the patient's intervertebral space. The doctor will then use a clamping instrument to clamp the rear end head 13 and gradually push the front end head 12 into the patient's lumbar intervertebral space. At this time, the rear end head 13 is exposed in the incision.

[0040] When the doctor needs to adjust the shape of the intercone fusion device, such as adjusting the intercone fusion device to an arc shape, the doctor controls the winding device to wind the titanium alloy wire 15 on the side of the fusion device body 1 that needs to be bent, so that the front end head 12 is pulled by the titanium alloy wire 15 and continuously approaches the rear end head 13, so that the part of the front end head 12 pulled by the titanium alloy wire 15 pushes the one side of the combination frame 14 to squeeze and tighten the spring 151 to approach each other, while the titanium alloy wire 15 on the other side of the front end head 12 is not wound. If it is in a horizontal state with the combination frame 14 and the rear end head 13 on this side, in order to achieve the goal that the part of the front end head 12 pulled by the titanium alloy wire 15 pushes the one side of the combination frame 14 to squeeze and tighten the spring 151 to approach each other, Then, the front end head 12, the rear end head 13 and the combination frame 14 close to the front end head 12 and the rear end head 13 need to bend; however, the front end head 12, the rear end head 13 and the combination frame 14 are made of titanium alloy material, that is, they are rigid and will not bend. Therefore, when one end of the combination frame 14 is pulled closer, the front end head 12, the rear end head 13 and the combination frame 14 close to the front end head 12 and the rear end head 13 cannot freely remain in the original plane, and they must rotate around the combination frame 14 in the middle part, which causes the fusion device body 1 to form an arc; after adjusting the fusion device body 1 to the required arc, the position of the fusion device body 1 is adjusted to ensure its fit with the vertebral body;

[0041] Although the fusion device body 1 is I-type in the initial state, the existing I-type fusion device structure needs to effectively bear the vertical load from the upper and lower vertebrae in design; its straight shape helps to evenly distribute the force, avoid unnecessary stress concentration, and ensure stability; and although the fusion device body 1 of the present invention is I-type, it will still bend and deform under the action of external force, so it cannot ensure that it can maintain a straight shape and be accurately placed in the patient's intervertebral space. Therefore, when the doctor needs to use the I-type fusion device, he only needs to control the winding unit to wind the two titanium alloy wires 15 so that the two titanium alloy wires 15 can be pulled. The front end head 12 is moved close to the rear end head 13; since the side wall of the combination frame 14 is provided with a receiving groove, and the holding spring 151 is located in the receiving groove, when the titanium alloy wire 15 pulls the front end head 12, the front end head 12 squeezes the holding spring 151 and pushes all the combination frames 14 close to each other and tightly. At this time, the contracted holding spring 151 is located in the receiving groove. At this time, the fusion device is I-shaped, and since there is no gap between the combination frames 14, it will not bend, thereby ensuring that the present invention can be accurately placed in the patient's intervertebral space in a straight line shape, thereby improving the practicality of the present invention and making it convenient for doctors to use.

[0042] Since the intervertebral heights of different patients are different, the existing adjustable intervertebral fusion cages all raise and lower the heights of both ends synchronously when adjusting the height. In patients with relatively normal anatomical structures and no significant deformities, the use of synchronous lifting can simplify the surgical process and reduce complexity. However, most of the existing intervertebral patients suffer from different degrees of intervertebral lesions and spinal structure changes due to trauma or sedentary lifestyles, lack of exercise, etc., which makes the intervertebral space have a certain physiological curvature, that is, it is in an asymmetrical state. To this end, the present invention provides two spiral cylinders 22, so that the two spiral cylinders 22 can push the support plate 2 near the front end head 12 and the rear end head 13 to rise and fall respectively through the spiral rod 21, so that the support plate 2 pushes the expansion block 11 to rise to inconsistent heights. The inconsistent lifting of the expansion blocks 11 at both ends can adjust the vertebrae with different intervertebral spaces to different degrees to correct the vertebral position and angle; balance the pressure distribution between the intervertebral spaces, and then help correct the natural curvature of the spine, make it more in line with the physiological state, and improve the stability and function of the spine.

[0043] If the intervertebral space near the front end head 12 of the patient is larger, the doctor needs to control the support height of the expansion block 11 at the front end head 12 to increase. At this time, the doctor only needs to rotate the rotating rod 23 so that the rotating rod 23 can rotate counterclockwise, so that the counterclockwise rotating rotating rod 23 can drive the spur gear ring 26 on the surface to rotate. Since the surface rotation of the gear plate 27 is connected to the pawl 272, the tip of the pawl 272 on the gear plate 27 fixed to the straight rod 251 is facing the counterclockwise rotation direction, and the tip of the pawl 272 on the gear plate 27 fixed to the straight rod 251 is facing the clockwise rotation direction; when the spur gear ring 26 rotates counterclockwise, the spur gear ring 26 can push the pawl 272 on the gear plate 27 connected to the straight rod 251 to rotate clockwise, so that the pawl 272 pushes the straight rod 251 to rotate through the gear plate 27 connected thereto, so that the straight rod 251 drives the metal rope 25 fixed thereto to wrap around the straight rod On the surface of the rod 251, since the metal rope 25 is fixedly connected to the worm 222 rotatably connected to the front end head 12, and the metal rope 25 is wound around the surface of the worm 222 rotatably connected to the front end head 12, the metal rope 25 can pull the worm 222 rotatably connected to the front end head 12 to rotate, so that the worm 222 rotatably connected to the front end head 12 drives the engaged worm gear ring 221 to rotate, so that the worm gear ring 221 can drive the spiral barrel 22 to rotate; since the spiral rod 21 is hinged to the support plate 2, the spiral barrel 22 rotates relative to the spiral rod 21, so that the spiral rod 21 continuously extends out of the spiral barrel 22. At this time, the spiral rods 21 located at the upper and lower ends of the spiral barrel 22 push the upper and lower support plates 2 away from each other, so that the support plate 2 pushes the expansion block 11 near the front end head 12 away from the combination frame 14 through the push rod 112, so that the expansion block 11 can fill and support the larger intervertebral space near the front end head 12;The spiral drum 22 near the rear end head 13 will not rotate. This is because when the rotating rod 23 drives the spur gear ring 26 to rotate, the spur gear ring 26 and the arcuate surface of the pawl 272 on the gear disk 27 on the surface of the bevel gear shaft 24 slide in contact, so that the pawl 272 is pushed by the spur gear ring 26 to overcome the torsion force of the torsion spring and rotate into the groove 271 until the teeth of the spur gear ring 26 pass over the pawl 272. At this time, the pawl 272 is reset under the action of the restoring force of the torsion spring, so that the spur gear ring 26 cannot push the gear disk 27 connected to the bevel gear shaft 24 to rotate through the pawl 272. Therefore, the spiral drum 22 near the rear end head 13 will not be driven by the bevel gear shaft 24 to rotate. If the intervertebral space near the rear end head 13 is large, the user only needs to use a tool to rotate the rotating rod 23 clockwise , so that the rotating rod 23 can push the pawl 272 near the bevel gear shaft 24 through the spur gear ring 26 to push the gear plate 27 connected to the bevel gear shaft 24 to rotate, so that the gear plate 27 drives the bevel gear shaft 24 to rotate, so that the bevel gear shaft 24 can drive the meshing bevel gear ring 231 to drive the worm 222 rotatably connected to the rear end head 13 to rotate, so that the worm 222 rotatably connected to the rear end head 13 can drive the meshing worm gear ring 221 to rotate, so that the worm gear ring 221 drives the spiral barrel 22 to rotate, so that the spiral barrel 22 drives the internal spiral rod 21 to push the support plate 2 and drive the expansion block 11 near the rear end head 13 away from the assembly frame 14, so that the expansion block 11 near the rear end head 13 can fill and support the larger intervertebral space near the rear end head 13.

[0044] As an embodiment of the present invention, the winding unit includes a winding roller 16; a cylindrical groove 161 is opened on the outer surface of the rear end head 13; the winding roller 16 is rotatably connected in the cylindrical groove 161; one end of the titanium alloy wire 15 is fixedly connected to the front end head 12, and the other end passes through the combination frame 14 and is fixedly connected to the winding roller 16; there are two winding rollers 16; the two winding rollers 16 are distributed on both sides of the rotating rod 23.

[0045] As an embodiment of the present invention, a support spring 162 is provided between the winding roller 16 and the bottom of the cylindrical groove 161; one end of the support spring 162 is fixedly connected to the bottom of the cylindrical groove 161, and the other end is rotatably connected to the winding roller 16; a bevel gear ring 163 is fixedly connected to the surface of the winding roller 16; and meshing teeth 164 that mesh with the bevel gear ring 163 are fixedly connected to the cavity wall of the cylindrical groove 161;

[0046] During operation, in the initial state, the bevel gear ring 163 is meshed with the meshing teeth 164, and because the meshing teeth 164 are fixedly connected to the inner wall of the cylindrical groove 161, the bevel gear ring 163 meshed with the meshing teeth 164 cannot rotate under the obstruction of the meshing teeth 164, that is, when the winding roller 16 is rotated, the bevel gear ring 163 fixedly connected to the surface of the winding roller 16 will block the rotation of the winding roller 16; when it is necessary to reel the titanium alloy wire 15 on one side, a flat-blade screwdriver or other tool is used to push the bevel gear ring 163 against the meshing teeth 164. The winding roller 16 of the titanium alloy wire 15 to be wound squeezes the support spring 162 into the cylindrical groove 161, so that the winding roller 16 drives the bevel gear ring 163 on the surface away from the meshing teeth 164, and then rotates the winding roller 16, so that the winding roller 16 drives the bevel gear ring 163 on the surface to rotate, and because the end of the titanium alloy wire 15 away from the front end head 12 is fixedly connected to the surface of the winding roller 16, during the rotation of the winding roller 16, the winding roller 16 can drive the titanium alloy wire 15 fixedly connected to the surface. The wire 15 is wound around the surface of the winding roller 16, so that the length of the titanium alloy wire 15 is reduced, so that the titanium alloy wire 15 can pull the front end head 12 toward the rear end head 13; so that the fusion device body 1 forms an arc. If the shape adjustment of the fusion device body 1 is completed at this time, the user can pull the flat-blade screwdriver out of the cylindrical slot 161. At this time, the winding roller 16 extends out of the cylindrical slot 161 under the push of the restoring force of the support spring 162, so that the winding roller 16 is still in contact with the flat-blade screwdriver under the push of the support spring 162. Because the flat-blade screwdriver is not in a rotating state, the winding roller 16 connected to the flat-blade screwdriver will not rotate under the obstruction of the flat-blade screwdriver until the winding roller 16 drives the bevel gear ring 163 fixed on the surface to approach the meshing teeth 164, so that the meshing teeth 164 engage with the bevel gear ring 163. At this time, the meshing teeth 164 block the bevel gear ring 163, and the user can take out the flat-blade screwdriver; at this time, the winding of the titanium alloy wire 15 is completed.

[0047] As an embodiment of the present invention, the support plate 2 includes a U-shaped plate 28 and a hinged rod 281; two U-shaped plates 28 are provided; the two U-shaped plates 28 are respectively connected to the front end head 12 and the rear end head 13 through a push rod 112; the hinged rod 281 is located between the two U-shaped plates 28 and is hinged to the U-shaped plate 28; the push rod 112 close to the hinged rod 281 is fixedly connected to the hinged rod 281.

[0048] As an embodiment of the present invention, the hinge rod 281 has rectangular grooves 282 at both ends; a hinge joint 283 is slidably connected in the rectangular groove 282; the hinge rod 281 is hinged to the front end head 12 and the rear end head 13 through the hinge joint 283; and two adjacent hinge rods 281 are hinged to each other through the hinge joint 283;

[0049] During operation, since the two ends of the support plate 2 are parallel to the front end head 12 and the rear end head 13 respectively, and when the titanium alloy wire 15 pulls the front end head 12 close to the rear end head 13 and an arc deflection occurs, the front end head 12 and the rear end head 13 will drive the support plate 2 to deflect synchronously, so that the support plate 2 also undergoes arc deformation. If the support plate 2 undergoes arc deformation, the support plate 2 needs to be made of elastic material, but the support plate 2 made of elastic material does not have good rigidity, that is, it cannot produce a good supporting and pushing effect on the expansion block 11. For this purpose, the present invention provides a hinge rod 281, and the hinge rod 281 and the U-shaped plate 28 are made of titanium alloy material, so that the hinge rod 281 and the U-shaped plate 28 can have good rigidity, and the number of hinge rods 281 is consistent with the number of combination frames 14, so that each hinge rod 281 is connected to the pushing rod 112 in the combination frame 14, and the connection between the hinge rods 281 is a chain structure. When the front end head 12 is pulled by the titanium alloy wire 15 and approaches the rear end head 13 When the front end head 12 is deflected, the front end head 12 will squeeze the combination frame 14 to deflect into an arc. At this time, the U-shaped plate 28 is deflected under the drive of the front end head 12. Due to the deflection of the combination frame 14, the combination frame 14 can drive the hinge rod 281 to deflect, that is, the adjacent hinge rods 281 rotate relative to each other. Due to the arrangement of the hinge rod 281, the chain-like hinge rod 281 combination structure has good flexibility in the horizontal direction and high stability in the vertical direction; therefore, when the fusion device body 1 is bent, the hinge rods 281 can also be flexible and complete, and when the spiral rod 21 pushes the upper and lower U-shaped plates 28 away from each other, the upper and lower U-shaped plates 28 can drive the hinge rods 281 hinged thereto to move away from each other, so that the upper and lower two sets of hinge rods 281 not only do not bend in the vertical direction, but also have good rigidity in the vertical direction, so that the hinge rod 281 can effectively support the expansion block 11 through the push rod 112 fixed thereto;

[0050] By setting the hinged joint 283, when the doctor needs to use a stable I-type fusion device, the doctor rolls up the titanium alloy wires 15 on both sides so that the front end head 12 and the rear end head 13 squeeze the combination frame 14 to contact and press against each other. At this time, the length of the fusion device body 1 is shortened and takes a stable I-shape. At this time, the U-shaped plate 28 connected to the front end head 12 and the rear end head 13 will squeeze the hinged rod 281, so that the hinged joint 283 of the hinged rod 281 will be inserted into the rectangular groove 282 under the action of the squeezing force, thereby preventing the hinged rod 281 from blocking the combination frame 14 from approaching and pressing against each other, thereby ensuring that the present invention can be used normally and stably, and the practicality of the present invention is further improved.

[0051] In the description of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate directions or positional relationships based on the attached Figure 1 The orientation or positional relationship shown is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, it cannot be understood as limiting the scope of protection of the present invention. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0052] The basic principles, main features, and advantages of the present invention are shown and described above. Those skilled in the art should understand that the present invention is not limited to the foregoing embodiments. The foregoing embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and modifications are intended to fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. An expandable intervertebral fusion cage, comprising a cage body (1), wherein expansion blocks (11) are mounted on both the upper and lower ends of the cage body (1); characterized in that: The fusion device body (1) comprises a front end head (12) and a rear end head (13); a combination frame (14) is provided between the front end head (12) and the rear end head (13); the combination frame (14) close to the front end head (12) and the rear end head (13) is fixedly connected to the front end head (12) and the rear end head (13); two adjacent combination frames (14) are fixedly connected via a bellows (141); a circular groove (111) is provided on the surface of the combination frame (14); a member slidably connected to the expansion block is provided in the circular groove (111). (11) a push rod (112) fixedly connected; a support plate (2) is provided between the front end head (12) and the rear end head (13); the support plate (2) is located in the combination frame (14); there are two support plates (2); the two support plates (2) are distributed up and down; the sides of the two support plates (2) that are away from each other are fixedly connected to the adjacent push rod (112); a push unit is provided between the two support plates (2); the push unit is used to push the two support plates (2) away from each other; A titanium alloy wire (15) is provided between the front end head (12) and the rear end head (13); one end of the titanium alloy wire (15) is fixedly connected to the front end head (12), and the other end passes through the combination frame (14) and is fixedly connected to the rear end head (13); a winding unit is installed on the outer surface of the rear end head (13); the winding unit is used to wind the titanium alloy wire (15); a tightening spring (151) is sleeved on the surface of the titanium alloy wire (15); the tightening spring (151) is located between two adjacent combination frames (14); two spiral cylinders (22) are provided, so that the two spiral cylinders (22) can push the support plate (2) to move up and down respectively at the two ends close to the front end head (12) and the rear end head (13) through the spiral rod (21), so that the support plate (2) pushes the expansion block (11) to move up and down at different heights, so that the inconsistent lifting of the expansion blocks (11) at the two ends can adjust the vertebrae with different cone gaps to different amplitudes, The pushing unit comprises a screw rod (21) and a screw barrel (22); two screw barrels (22) are provided; the two screw barrels (22) are rotatably connected to the front end head (12) and the rear end head (13) respectively; the screw rod (21) is connected to the screw barrel (22) by spiral transmission; one end of the screw rod (21) away from the screw barrel (22) is hinged to the support plate (2); a worm wheel ring (221) is fixedly connected to the surface of the screw barrel (22); a worm (222) meshing with the worm wheel ring (221) is provided on one side; the two worms (222) are rotatably connected to the front end head (12) and the rear end head (13) respectively; the outer wall of the rear end head (13) is rotatably connected to the rotating rod (23); the rotating rod (23) and the worm (222) are connected via a transmission unit; The support plate (2) comprises a U-shaped plate (28) and a hinge rod (281); two U-shaped plates (28) are provided; the two U-shaped plates (28) are respectively connected to the front end head (12) and the rear end head (13) via a push rod (112); the hinge rod (281) is located between the two U-shaped plates (28) and is hinged to the U-shaped plates (28); the push rod (112) close to the hinge rod (281) is fixedly connected to the hinge rod (281).

2. The expandable intervertebral fusion cage according to claim 1, characterized in that: The transmission unit comprises a bevel gear ring (231) and a bevel gear shaft (24); the bevel gear ring (231) is fixedly connected to a worm (222) near the rear end head (13); the bevel gear shaft (24) is rotatably connected to the rear end head (13); one end of the worm (222) near the front end head (12) is fixedly connected to a metal rope (25); the metal rope (25) is made of a titanium alloy material; a side of the rotating rod (23) away from the bevel gear shaft (24) is rotatably connected to a straight rod (251); one end of the metal rope (25) away from the worm (222) is fixedly connected to the straight rod (251); the rotating rod (23), the straight rod (251) and the bevel gear shaft (24) are meshed and transmitted through a gear set.

3. The expandable intervertebral fusion cage according to claim 2, characterized in that: The gear set comprises a spur gear ring (26); the spur gear ring (26) is fixedly connected to a rotating rod (23); gear plates (27) are provided on both sides of the spur gear ring (26); the two gear plates (27) are respectively fixedly connected to a bevel gear shaft (24) and a straight rod (251); a groove (271) is provided on the surface of the gear plate (27); a ratchet (272) is provided in the groove (271); the ratchet (272) is rotationally connected to the groove wall of the groove (271) via a torsion spring.

4. The expandable intervertebral fusion cage according to claim 3, characterized in that: The winding unit includes a winding roller (16); a cylindrical groove (161) is provided on the outer surface of the rear end head (13); the winding roller (16) is rotatably connected in the cylindrical groove (161); one end of the titanium alloy wire (15) is fixedly connected to the front end head (12), and the other end passes through the combination frame (14) and is fixedly connected to the winding roller (16); there are two winding rollers (16); the two winding rollers (16) are distributed on both sides of the rotating rod (23).

5. The expandable intervertebral fusion cage according to claim 4, characterized in that: A support spring (162) is provided between the winding roller (16) and the bottom of the cylindrical groove (161); one end of the support spring (162) is fixedly connected to the bottom of the cylindrical groove (161), and the other end is rotatably connected to the winding roller (16); a bevel gear ring (163) is fixedly connected to the surface of the winding roller (16); and meshing teeth (164) meshing with the bevel gear ring (163) are fixedly connected to the cavity wall of the cylindrical groove (161).

6. The expandable intervertebral fusion cage according to claim 5, characterized in that: Rectangular grooves (282) are provided at both ends of the hinge rod (281); a hinge joint (283) is slidably connected in the rectangular groove (282); the hinge rod (281) is hinged to the front end head (12) and the rear end head (13) through the hinge joint (283); and two adjacent hinge rods (281) are hinged to each other through the hinge joint (283).

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