Expansion type interbody fusion cage

Abstract

The invention relates to the technical field of interbody fusion cages, in particular to an expansion type interbody fusion cage. Comprising a fusion cage body, and expansion blocks are installed at the upper end and the lower end of the fusion cage body; the fusion cage body comprises a front end head and a rear end head; by arranging the combined frame, the steel wire rope and the abutting spring, when the winding unit winds the steel wire rope on one side, the steel wire rope can pull the front end to be close to the rear end, so that the distance between the front end and the rear end is reduced, and the combined frame on the side where the stretched steel wire rope is located extrudes the abutting spring to be close to each other; the combined frame is bent towards the side where the stretched steel wire rope is located, so that the geometrical shape of the overall structure of the fusion cage body naturally tends to form an arc shape under the action of pulling force, and force balance is achieved; the angle and position of the fusion cage can be conveniently adjusted by a doctor, the attachment between the fusion cage and the vertebral body of a patient is enhanced, the replacement requirement of the fusion cage is reduced, the operation time is shortened, and the postoperative recovery effect of the patient is improved.

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] Intervertebral fusion cage is a medical device used in spinal surgery, mainly used to treat degenerative disc disease, spinal instability or other spinal problems; its main function is to help restore the structure and function of the spine by providing stable support and promoting bone healing; according to the raw materials of the fusion cage, it can be divided into metal and non-metal types, among which metal fusion cages are mainly titanium alloy fusion cages, while there are many types of non-metal fusion cages, mainly including biological fusion cages, composite fusion cages (such as carbon fiber, polyetheretherketone), etc. Existing intercone fusion cages have various shapes. On the one hand, due to individual differences in patients (individual bone development, including the shape, size and curvature of the spine), different patients have different spinal anatomical structures. In order to ensure that the intercone fusion cage used can better cooperate and reduce damage to surrounding tissues, surgeons will choose a suitable shape of fusion cage. On the other hand, intercone fusion cages of different shapes have different mechanical properties. For example, arc-shaped fusion cages can better disperse the load, while type I fusion cages perform better when linear support is required. Although during the preoperative evaluation, doctors will consider factors such as the patient's disease type, spinal curvature, and vertebral size to select a fusion device of appropriate size and shape; however, the actual vertebral anatomical structure is often significantly different from the expected one. Therefore, doctors need to dynamically adjust the shape of the selected fusion device based on the observed spinal condition to ensure the surgical effect and patient safety; the adjustment and replacement of fusion devices of different shapes and sizes will increase the total time of the operation and lead to a longer postoperative recovery time; 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

[0003] In order to make up for the deficiencies of the prior art, the present invention proposes an expandable intervertebral fusion device. The present invention arranges a combination frame, a steel wire rope and a tightening 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 tightening 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 doctors 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.

[0004] The technical solution adopted by the present invention to solve the technical problem is as follows: the expandable intervertebral fusion device described in the present invention comprises a fusion device body, and expansion blocks are installed at the upper end and the lower end of the fusion device body; The fusion device body comprises a front end head and a rear end head; a combination frame is arranged 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 pushing rod fixedly connected to the expansion block is slidably connected in the circular groove; a support plate is arranged 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 arranged at 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 pushing rods; a pushing unit is arranged between the two support plates; the pushing unit is used to push the two support plates away from each other; 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 clamping spring is sleeved on the surface of the titanium alloy wire; the clamping spring is located between two adjacent combination frames.

[0005] Preferably, the pushing unit includes a spiral rod and a spiral barrel; the spiral barrel is provided with two; the two spiral barrels are rotatably connected to the front end head and the rear end head respectively; the spiral rod is spirally transmitted to the spiral barrel; the end of the spiral rod away from the spiral barrel is hinged to the support plate; a worm gear ring is fixedly connected to the surface of the spiral barrel; a worm meshing 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 by a transmission unit.

[0006] 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; one 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.

[0007] 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.

[0008] 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; and the two winding rollers are distributed on both sides of the rotating rod.

[0009] Preferably, a support spring is arranged 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 meshing with the bevel gear ring.

[0010] 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 pushing rod; the hinged rod is located between the two U-shaped plates and is hinged to the U-shaped plates; the pushing rod close to the hinged rod is fixedly connected to the hinged rod.

[0011] Preferably, rectangular grooves are provided at both ends of the articulated rod; a hinge joint is slidably connected in the rectangular groove; the articulated rod is hinged to the front end head and the rear end head through the hinge joint; and two adjacent articulated rods are hinged through the hinge joint.

[0012] The beneficial effects of the present invention are as follows: 1. The present invention sets a combination frame, a steel wire rope and a tightening 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 tightening 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 doctors 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.

[0013] 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. The inconsistent lifting and lowering of the expansion blocks at both ends can adjust the vertebrae with different cone gaps to different extents 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

[0014] The present invention is further described below in conjunction with the accompanying drawings and implementation modes.

[0015] Figure 1 is a stereogram of the present invention; Figure 2 It is a schematic diagram of the structure of the present invention; Figure 3 yes Figure 2 The enlarged view of point A in the middle; Figure 4 yes Figure 2 The enlarged view of point B in the middle; Figure 5 It is a schematic diagram of the structure of the front end head used in the present invention; Figure 6 is a stereogram of a combination frame used in the present invention; Figure 7 It is a schematic structural diagram of the rear end head used in the present invention; Figure 8 yes Figure 7 Enlarged view of point C in the middle; 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. tightening spring; 16. winding roller; 161. cylindrical groove; 162. supporting spring; 163. bevel gear ring; 164. meshing teeth; 2. support plate; 21. spiral rod; 22. spiral cylinder; 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. hinge rod; 282. rectangular groove; 283. hinge head. DETAILED DESCRIPTION

[0016] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0017] like Figures 1 to 8 As shown, an expandable intervertebral fusion cage according to the present invention comprises a fusion cage body 1, and expansion blocks 11 are installed at both the upper and lower ends of the fusion cage body 1; The fusion device body 1 includes a front end head 12 and a rear end head 13; a combination frame 14 is arranged 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 arranged 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 arranged in two; the two support plates 2 are distributed up and down; the sides of the two support plates 2 away from each other are fixedly connected to the adjacent pushing rod 112; a pushing unit is arranged between the two support plates 2; the pushing unit is used to push the two support plates 2 away from each other; 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 clamping spring 151 is sleeved on the surface of the titanium alloy wire 15; the clamping spring 151 is located between two adjacent combination frames 14.

[0018] As an embodiment of the present invention, the pushing unit includes a spiral rod 21 and a spiral barrel 22; the spiral barrel 22 is provided with two; the two spiral barrels 22 are respectively rotatably connected to the front end head 12 and the rear end head 13; the spiral rod 21 is spirally transmitted to the spiral barrel 22; the end of the spiral rod 21 away from the spiral barrel 22 is hinged to the support plate 2; a worm gear ring 221 is fixedly connected to the surface of the spiral barrel 22; a worm 222 meshing 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.

[0019] 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 close to 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 close to 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 is meshed with the straight rod 251 and the bevel gear shaft 24 through a gear set.

[0020] 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; gear plates 27 are 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 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 through a torsion spring; At work, before lumbar surgery, doctors will consider factors such as the patient's disease type, spinal curvature, and vertebral size to select a fusion device of appropriate size and shape; however, the actual vertebral anatomical structure is often significantly different from the expected one, so doctors need to dynamically adjust the shape of the selected fusion device based on the observed spinal condition to ensure surgical results and patient safety; the adjustment and replacement of fusion devices of different shapes and sizes will increase the total time of the operation and lead to a longer postoperative recovery time; In this regard, the present invention sets 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 doctors 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; Before the operation, the doctor will perform general anesthesia or spinal anesthesia on the patient, and then the doctor will mark the surgical incision position on the patient's spine, make the incision after disinfection, so that the incision position can expose the patient's intervertebral space, and 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 which time the rear end head 13 is exposed in the incision; 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 up the titanium alloy wire 15 on the side of the fusion device body 1 that needs to be bent, so that one side of 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 one side of the combination frame 14 to squeeze and tighten the spring 151 to get closer to 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 that the part of the front end head 12 pulled by the titanium alloy wire 15 pushes one side of the combination frame 14 to squeeze and tighten the spring 151 to get closer to each other, 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 all 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 be freely maintained on 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, adjust the position of the fusion device body 1 to ensure its fit with the vertebral body; Although the fusion device body 1 is of type I in the initial state, the existing type I 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 of type I, it will still bend and deform under the action of external force, so that it cannot ensure that it can maintain a straight shape and be accurately placed between the patient's cones. Therefore, when the doctor needs to use the type I fusion device, he only needs to control the winding unit to wind up 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 to be close to each other and close to each other. 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 intercondylar space in a straight line shape, thereby improving the practicality of the present invention, and at the same time, it is also convenient for doctors to use; Since the intervertebral heights of different patients are different, and the existing adjustable intervertebral fusion devices are raised and lowered synchronously at both ends when adjusting the height, in patients with relatively normal anatomical structures and without significant deformities, the use of synchronous lifting can simplify the surgical process and reduce complexity; however, the existing intervertebral patients are mostly due to trauma or sedentary lifestyles, lack of exercise, etc., which lead to different degrees of intervertebral lesions and spinal structure changes, so that the intervertebral space has a certain physiological curvature, that is, it is in an asymmetrical state; for this, the present invention sets two spiral cylinders 22, so that the two spiral cylinders 22 can push the two ends of the support plate 2 close to 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, so that the inconsistent lifting of the expansion blocks 11 at both ends can adjust the vertebrae with different intervertebral spaces to different degrees, so as to correct the position and angle of the vertebrae; 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; If the intervertebral space near the front end head 12 of the patient is large, 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 rotating rod 23 rotating counterclockwise can drive the spur gear ring 26 on the surface to rotate. Since the surface of the gear plate 27 is connected with a ratchet 272 for rotation, the tip of the ratchet 272 on the gear plate 27 fixed to the straight rod 251 faces the counterclockwise rotation direction, while the tip of the ratchet 272 on the gear plate 27 fixed to the straight rod 251 faces the clockwise rotation direction; when the spur gear ring 26 rotates counterclockwise, the spur gear ring 26 can push the ratchet 272 on the gear plate 27 connected to the straight rod 251 to rotate clockwise, so that the ratchet 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 meshed worm wheel ring 221 to rotate, so that the worm wheel 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 close to 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 close to the front end head 12;The spiral barrel 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 drive the gear disk 27 connected to the bevel gear shaft 24 to rotate through the pawl 272. Therefore, the spiral barrel 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 bevel gear ring 231 meshed with it 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 worm wheel ring 221 meshed with it to rotate, so that the worm wheel 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 to drive the expansion block 11 near the rear end head 13 away from the combination 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. ;

[0021] 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.

[0022] 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 a meshing tooth 164 meshing with the bevel gear ring 163 is fixedly connected to the cavity wall of the cylindrical groove 161; When working, 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 at this time, 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 wind up the titanium alloy wire 15 on one side, a flat-blade screwdriver or other tool is used to push the adjacent 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 to extend out of the cylindrical groove 161. At this time, the winding roller 16 extends out of the cylindrical groove 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 mesh 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.

[0023] 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 plates 28; the push rod 112 close to the hinged rod 281 is fixedly connected to the hinged rod 281.

[0024] As an embodiment of the present invention, the two ends of the hinge rod 281 are provided with rectangular grooves 282; a hinge head 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 head 283; two adjacent hinge rods 281 are hinged through the hinge head 283; During operation, since the two ends of the support plate 2 are respectively parallel to the front end head 12 and the rear end head 13, 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 an arc deformation. If the support plate 2 undergoes an 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 deflects, the front end head 12 will squeeze the combination frame 14 to deflect into an arc. At this time, the U-shaped plate 28 deflects 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 setting 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 groups 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; By setting the hinged head 283, when the doctor needs to use a stable I-type fusion device, the doctor can roll up the titanium alloy wires 15 on both sides to make 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 presents 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 head 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.

[0025] 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.

[0026] The above shows and describes the basic principles, main features and advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. An expandable intervertebral fusion cage, comprising a cage body (1), wherein expansion blocks (11) are installed at 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 arranged 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 pushing rod (112) fixedly connected; a support plate (2) is arranged 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 arranged vertically; the sides of the two support plates (2) that are away from each other are fixedly connected to the adjacent pushing rod (112); a pushing unit is arranged between the two support plates (2); the pushing unit is used to push the two support plates (2) away from each other; 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 clamping spring (151) is sleeved on the surface of the titanium alloy wire (15); the clamping spring (151) is located between two adjacent combination frames (14).

2. The expandable intervertebral fusion cage according to claim 1, characterized in that: The pushing unit comprises a screw rod (21) and a screw barrel (22); two of the 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 a 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 a rotating rod (23); the rotating rod (23) and the worm (222) are connected via a transmission unit.

3. The expandable intervertebral fusion cage according to claim 2, 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) close to the rear end head (13); the bevel gear shaft (24) is rotatably connected to the rear end head (13); a metal rope (25) is fixedly connected to one end of the worm (222) close to the front end head (12); the metal rope (25) is made of titanium alloy material; a straight rod (251) is rotatably connected to the side of the rotating rod (23) away from the bevel gear shaft (24); one end of the metal rope (25) away from the worm (222) is fixedly connected to the straight rod (251); the rotating rod (23) is meshed with the straight rod (251) and the bevel gear shaft (24) through a gear set.

4. The expandable intervertebral fusion cage according to claim 3, 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 arranged 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 arranged in the groove (271); the ratchet (272) is rotationally connected to a groove wall of the groove (271) via a torsion spring.

5. The expandable intervertebral fusion cage according to claim 4, characterized in that: The winding unit comprises a winding roller (16); a cylindrical groove (161) is formed 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).

6. The expandable intervertebral fusion cage according to claim 5, 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 a meshing tooth (164) meshing with the bevel gear ring (163) is fixedly connected to the cavity wall of the cylindrical groove (161).

7. The expandable intervertebral fusion cage according to claim 6, characterized in that: The support plate (2) comprises 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) via a push rod (112); the hinged 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 hinged rod (281) is fixedly connected to the hinged rod (281).

8. The expandable intervertebral fusion cage according to claim 7, characterized in that: Rectangular grooves (282) are provided at both ends of the hinged rod (281); a hinge joint (283) is slidably connected in the rectangular groove (282); the hinged rod (281) is hingedly connected to the front end head (12) and the rear end head (13) via the hinge joint (283); and two adjacent hinged rods (281) are hingedly connected via the hinge joint (283).

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