Adjustable spinal internal fixation system

Abstract

The invention provides an adjustable spinal internal fixation system, and belongs to the technical field of medical instruments. The invention provides an adjustable spine internal fixing system which comprises two sets of fixing assemblies, a first lifting connecting rod set, a second lifting connecting rod set and a pushing piece, and the two sets of fixing assemblies are arranged on two sets of vertically adjacent vertebral bodies respectively; each fixing assembly comprises two sets of pedicle screws and two sets of angle adjusting pieces; the first lifting connecting rod group and the second lifting connecting rod group are arranged between the two groups of cones; the second lifting connecting rod set and the first lifting connecting rod set are arranged in a crossed mode. The pushing piece is transversely connected to the middle of the first lifting connecting rod set and the middle of the second lifting connecting rod set and used for pushing the first lifting connecting rod set and the second lifting connecting rod set to swing so that the cross angle of the first lifting connecting rod set and the second lifting connecting rod set can be changed, and the intervertebral space can be expanded. After the adjustable internal fixation system for the spine is implanted, the intervertebral space is expanded according to actual conditions.

Description

Technical Field

[0001] This invention belongs to the field of medical device technology, specifically relating to an adjustable spinal internal fixation system. Background Technology

[0002] When the human spine becomes unstable due to degeneration or trauma, pain may occur in the corresponding area, and even nerve or spinal cord compression may occur. In this case, spinal internal fixation surgery is usually required. During the operation, the intervertebral space needs to be opened to restore the vertebral body to a certain height and the physiological curvature of the spine, avoiding nerve root compression. At the same time, the imbalance in the sagittal and coronal planes is corrected. The opening and repositioning of the vertebral body is the key to the success of the operation.

[0003] The spinal repositioning device mainly includes a connecting rod and pedicle screws. The threaded body of the pedicle screw is implanted into the spine and fixed to the spine. The pedicle screw base is connected to the connecting rod. A vertebral body distraction device is used to open the intervertebral space, adjust the distance and angle between the pedicle screws, and then lock the pre-bent and deformed connecting rod and the corresponding pedicle screw to achieve the purpose of corrective treatment.

[0004] After conventional spinal implantation, the intervertebral space is not easily opened, and the angle between the intervertebral space and the vertebral body remains largely unchanged. Common vertebral body opening tools are cumbersome to operate and cannot meet the needs of different patients. Especially after spinal deformity correction in adolescents, when the fixation of the intervertebral space and vertebral angle conflicts with the adolescent's growth and development, the operation becomes more difficult and the impact on the adolescent is more serious. Summary of the Invention

[0005] The purpose of this invention is to provide an adjustable spinal internal fixation system, which aims to solve the problems of difficulty in opening the intervertebral space and difficulty in calibrating the physiological curvature of the spine during surgery, and the difficulty in secondary adjustment after spinal deformity correction surgery in adolescents.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows: An adjustable spinal internal fixation system is provided, comprising: two sets of fixation components, respectively disposed on two adjacent sets of vertebral bodies; each set of fixation components includes two sets of pedicle screws and two sets of angle adjustment components; the two sets of pedicle screws are respectively disposed on the left and right sides of the corresponding vertebral body, and the angle adjustment components are disposed in a one-to-one correspondence with the pedicle screws, with the angle adjustment components disposed on the side of the pedicle screws closer to the other set of vertebral bodies; The first lifting connecting rod assembly has its upper end connected to the angle adjustment component on the upper left side and its lower end connected to the angle adjustment component on the lower left side. The second lifting connecting rod assembly is arranged crosswise with the first lifting connecting rod assembly, with its upper end connected to the angle adjusting component on the upper right and its lower end connected to the angle adjusting component on the lower right; and A pusher is laterally connected to the middle of the first lifting connecting rod group and the middle of the second lifting connecting rod group. The pusher is used to push the first lifting connecting rod group and the second lifting connecting rod group to swing, so as to change the intersection angle of the first lifting connecting rod group and the second lifting connecting rod group and realize the opening of the intervertebral space.

[0007] In one possible implementation, the first lifting connecting rod assembly includes: The upper end of the first upper connecting rod is hinged to the angle adjustment component on the upper left side; The upper end of the first lower connecting rod is hinged to the lower end of the first upper connecting rod via a first hinge shaft, and the lower end is hinged to the angle adjustment member on the lower left side. The second lifting connecting rod assembly includes: The upper end of the second upper connecting rod is hinged to the angle adjustment component on the upper right side; The upper end of the second lower connecting rod is hinged to the lower end of the second upper connecting rod via the second hinge shaft, and the lower end is hinged to the angle adjustment component on the lower right side. The pusher is located on the side of the second hinge shaft.

[0008] In one possible implementation, the middle portion of the first upper link is hinged to the middle portion of the second upper link, and the middle portion of the first lower link is hinged to the middle portion of the second lower link.

[0009] In one possible implementation, the actuating element includes: The sliding plate has a sliding groove extending along the width direction of the cone; the rear ends of the first hinge shaft and the second hinge shaft are slidably disposed within the sliding groove. An adjustment box is disposed at the first end of the sliding plate and near the second hinge axis; The push rod has its first end inserted into the adjustment box and its second end abutting against the side wall of the second hinge shaft. The adjusting box pushes the push rod to slide, and the push rod pushes the second hinge shaft, causing the first lifting connecting rod group and the second lifting connecting rod group to swing, so as to change the intersection angle of the first lifting connecting rod group and the second lifting connecting rod group.

[0010] In one possible implementation, the adjustment box includes: Box body; A rotating shaft is located on the rear side wall of the housing. A rotating cam is rotatably mounted on the rotating shaft, and the first end of the push rod abuts against the side wall of the rotating cam; and A rotary knob is rotatably mounted on the front side wall of the housing, and the rear side wall of the rotary knob is mounted on the front side wall of the rotary cam.

[0011] In one possible implementation, a pointer for indicating the position of the rotating cam is provided on the front sidewall of the rotary knob.

[0012] In one possible implementation, the first end of the angle adjustment member is disposed on the pedicle screw, and the second end of the angle adjustment member is hinged to the first lifting connecting rod group / the second lifting connecting rod group. The angle adjustment member is used to adjust the angle of the first lifting connecting rod group / the second lifting connecting rod group.

[0013] In one possible implementation, the angle adjustment element includes: The connecting rod has its first end mounted on the pedicle screw and its second end inserted into the first end of the adjusting outer cylinder. Adjusting the outer cylinder, wherein the second end of the adjusting outer cylinder is hinged to the first lifting connecting rod assembly / the second lifting connecting rod assembly; and An angle adjustment column is provided through the front side wall of the adjustment outer cylinder; The second end of the connecting rod abuts against the side wall of the angle adjusting column, adjusting the displacement of the angle adjusting column in the front-back direction, and adjusting the relative angle between the connecting rod and the adjusting outer cylinder.

[0014] In one possible implementation, the outer wall of the angle adjusting column is provided with threads, and the angle adjusting column is threadedly connected to the front wall of the adjusting outer cylinder. The second end of the connecting rod is provided with an adjustment tip, which abuts against the threaded groove on the outer side wall of the angle adjustment column.

[0015] In one possible implementation, the second end of the adjusting outer cylinder is adapted to allow the connecting rod to pass through.

[0016] The beneficial effects of the adjustable spinal internal fixation system provided by this invention are as follows: The fixation assembly is used to fix the patient's vertebral body. Two sets of pedicle screws are installed on one vertebral body, and the two sets of pedicle screws can be set at the same height. The pedicle screws of the two sets of fixation components are set on the two adjacent vertebrae that need to be opened up. The first lifting connecting rod group and the second lifting connecting rod group connected with the angle adjustment component are set on the pedicle screws of the upper and lower vertebrae. The angle between the pedicle screws and the first lifting connecting rod group and the second lifting connecting rod group is adjusted with the help of the angle adjustment component. By using a pusher, the angles of the first and second lifting connecting rod groups are changed, thereby changing the height of the first and second lifting connecting rod groups. This opens up the distance between the pedicle screws of the upper and lower vertebrae, thereby driving the movement of the vertebrae, opening the intervertebral space, and restoring the vertebral height.

[0017] The first and second lifting connecting rod assemblies involved in this application are easy to operate. Using a pusher, the first and second lifting connecting rod assemblies are opened, and the opening height can be adjusted according to actual needs. After opening the intervertebral space, this fixation system remains in the patient's body, which can continuously open the intervertebral space, increase the stability of the intervertebral space opening, and help the patient's recovery. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a front view schematic diagram of the expandable pedicle fixation system provided in an embodiment of the present invention; Figure 2 This is a partially enlarged structural diagram of the pushing component used in an embodiment of the present invention; Figure 3 This is a schematic diagram of the rotating cam used in an embodiment of the present invention; Figure 4 This is a cross-sectional view of the angle adjustment component used in an embodiment of the present invention.

[0020] In the diagram: 101, vertebral body; 102, pin seat; 103, locking block; 201, first upper connecting rod; 202, first lower connecting rod; 203, first hinge shaft; 204, second upper connecting rod; 205, second lower connecting rod; 206, second hinge shaft; 207, hinge plate; 208, positioning ring; 301, push rod; 302, sliding plate; 303, sliding groove; 304, housing; 305, rotating cam; 306, rotating knob; 307, ratchet; 308, rotating locking element; 309, short axis pointer; 310, long axis pointer; 311, first instrument slot; 312, scale; 401, second instrument slot; 402, adjusting outer cylinder; 403, connecting rod; 404, anti-dislodgement block; 405, adjusting tip; 406, angle adjusting column; 407, thread. Detailed Implementation

[0021] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0022] For ease of description, the height direction of vertebral body 101 is defined as the vertical direction, two adjacent sets of vertebral bodies 101 are arranged vertically, the bone surface on which the pedicle screw is implanted in vertebral body 101 is defined as the anterior bone surface, and the width direction of vertebral body 101 is defined as the left-right direction.

[0023] The pedicle screw used in this application can be a common universal pedicle screw. The pedicle screw includes a screw body, a screw seat 102, and a locking block 103. The upper end of the screw body is provided with a universal head, which is located inside the screw seat 102. The screw seat 102 is a U-shaped screw seat. The side wall of the screw seat 102 is provided with a U-shaped groove suitable for the connecting rod 403 to pass through. The outer side wall of the locking block 103 is provided with a thread 407. The locking block 103 is connected to the inner side wall of the screw seat 102 by the thread 407. The locking block 103 can lock the connecting rod 403 inside the screw seat 102.

[0024] Combination Figures 1 to 4 On the two sets of vertebral bodies 101 that require intervertebral disc opening, the points where the pedicle screws need to be implanted are selected. The two sets of pedicle screws on the same vertebral body 101 are at the same height. The pedicle screws on the same side of the two adjacent vertebral bodies 101 are located in the same vertical direction. The pedicle screws on the upper and lower vertebral bodies 101 are implanted sequentially with the help of surgical instruments. The angle adjustment component, the first lifting connecting rod group, and the second lifting connecting rod group are a whole. The four sets of angle adjustment components are respectively placed into the nail seats 102 of the four sets of pedicle screws on the two sets of vertebral bodies 101. The locking block 103 is used to lock the end of the angle adjustment component in the nail seat 102. The two sets of fixation components are respectively set on the upper and lower vertebral bodies 101.

[0025] Combination Figures 1 to 3 The first and second lifting connecting rod groups are arranged in a cross configuration. The first and second lifting connecting rod groups have the same structure and their opening directions are opposite. The first / second lifting connecting rod group includes at least two sets of connecting rods. The connecting rods of the first / second lifting connecting rod group have an angle between them. Increasing the angle between the connecting rods will increase the height of the first / second lifting connecting rod group, thereby increasing the intervertebral space of the patient.

[0026] The following is an example illustrating the first lifting connecting rod group / second lifting connecting rod group, which includes two sets of connecting rods.

[0027] The upper and lower ends of the first lifting connecting rod assembly are respectively set on the angle adjustment components inside the pedicle screw seat 102 on the left side of the two vertebral bodies 101. The first lifting connecting rod assembly includes a first upper connecting rod 201 and a first lower connecting rod 202. The lower end of the first upper connecting rod 201 and the upper end of the first lower connecting rod 202 are hinged through a first hinge shaft 203. The openings of the first upper connecting rod 201 and the first lower connecting rod 202 of the first lifting connecting rod assembly are set to face the left side.

[0028] The first upper connecting rod 201 and the first lower connecting rod 202 have the same length and are arranged symmetrically vertically. The first hinge shaft 203 is located on the center line of the first lifting connecting rod assembly.

[0029] The upper and lower ends of the second lifting connecting rod assembly are respectively set on the angle adjustment components inside the pedicle screw seat 102 on the right side of the two vertebral bodies 101. The second lifting connecting rod assembly includes a second upper connecting rod 204 and a second lower connecting rod 205. The lower end of the second upper connecting rod 204 and the upper end of the second lower connecting rod 205 are hinged through a second hinge shaft 206. The openings of the second upper connecting rod 204 and the second lower connecting rod 205 of the second lifting connecting rod assembly are set to face the right side.

[0030] The second upper connecting rod 204 and the second lower connecting rod 205 have the same length and are arranged symmetrically vertically. The second hinge shaft 206 is located on the center line of the second lifting connecting rod assembly.

[0031] The first upper link 201, the first lower link 202, the second upper link 204, and the second lower link 205 all have the same length.

[0032] The first hinge shaft 203 and the second hinge shaft 206 are located at the same height, which increases the stability of the device.

[0033] A hinge plate 207 is provided on the side wall of the angle adjustment component near the other set of vertebrae. The hinge plate 207 of the angle adjustment component of the upper vertebra 101 is set downwards, and the hinge plate 207 of the angle adjustment component of the lower vertebra 101 is set upwards. The upper end of the first upper connecting rod 201, the lower end of the first lower connecting rod 202, the upper end of the second upper connecting rod 204, and the lower end of the second lower connecting rod 205 are respectively hinged to the corresponding hinge plate 207, which facilitates the lifting and lowering adjustment of the first lifting connecting rod group and the second lifting connecting rod group.

[0034] The first upper connecting rod 201 and the second upper connecting rod 204 are arranged crosswise and are hinged at the intersection. The hinge point of the first upper connecting rod 201 and the second upper connecting rod 204 is located in the middle section of the first upper connecting rod 201, or it can be located near the first hinge axis 203. The first lower connecting rod 202 and the second lower connecting rod 205 are arranged crosswise and are hinged at the intersection. The hinge point of the first lower connecting rod 202 and the second lower connecting rod 205 is located in the middle section of the first lower connecting rod 202, or it can be located near the first hinge axis 203, which helps to increase the stability of the device.

[0035] Combination Figures 1 to 3 The pusher is used to change the angle between the links of the lifting linkage group. The pusher can push the first hinge shaft 203 and / or the second hinge shaft 206 to move in the left and right direction. Under the push of the pusher, the angle between the first upper link 201 and the first lower link 202 and the angle between the second upper link 204 and the second lower link 205 are changed, thereby changing the height of the first lifting linkage group and the second lifting linkage group.

[0036] In one embodiment, the pusher can be located on the right side of the first hinge shaft 203 to push the first hinge shaft 203 to achieve displacement in the left and right directions. Under the action of the hinge of the first upper connecting rod 201 and the second upper connecting rod 204 and the hinge of the first lower connecting rod 202 and the second lower connecting rod 205, the second hinge shaft 206 will change displacement synchronously.

[0037] In one embodiment, the pusher can be disposed on the left side of the second hinge shaft 206 to push the second hinge shaft 206 to achieve displacement in the left and right directions. Under the action of the first upper connecting rod 201 and the second upper connecting rod 204 hinged together and the first lower connecting rod 202 and the second lower connecting rod 205 hinged together, the first hinge shaft 203 will change displacement synchronously.

[0038] Combination Figures 1 to 3 The following is an example in which the pusher is located on the left side of the second hinge shaft 206.

[0039] The pusher includes an adjustment box, a push rod 301, and a sliding plate 302. The adjustment box is located on the left side of the second hinge shaft 206. The push rod 301 is used to push the second hinge shaft 206. The sliding plate 302 facilitates the sliding of the second hinge shaft 206.

[0040] The sliding plate 302 is arranged along the left and right width direction of the vertebral body 101, and the plate surface of the sliding plate 302 is arranged vertically. The sliding plate 302 is located between the pedicle screws between the upper and lower sets of vertebral bodies 101. The sliding groove 303 is arranged on the sliding plate 302 and is arranged along the length direction of the sliding plate 302.

[0041] The sliding plate 302 is located on the rear side of the first lifting connecting rod group and the second lifting connecting rod group.

[0042] The rear end of the first hinge shaft 203 is slidably disposed in the sliding groove 303, and has the freedom to slide left and right in the sliding groove 303. A first blocking block may be provided at the rear end of the first hinge shaft 203. The first blocking block is located on the rear side of the sliding plate 302 and prevents the first hinge shaft 203 from falling out of the sliding groove 303.

[0043] The rear end of the second hinge shaft 206 is slidably disposed in the sliding groove 303, and has the freedom to slide left and right in the sliding groove 303. A second blocking block may be provided at the rear end of the second hinge shaft 206. The second blocking block is located on the rear side of the sliding plate 302 and prevents the second hinge shaft 206 from falling out of the sliding groove 303.

[0044] The push rod 301 is set parallel to the sliding plate 302 and is located on the front side of the sliding plate 302. The right end of the push rod 301 abuts against the left side wall of the second hinge shaft 206, and the left end of the push rod 301 passes into the adjustment box.

[0045] A positioning ring 208 can be fitted onto the front end of the second hinge shaft 206. The positioning ring 208 is located on the front side of the second upper connecting rod 204 and the second lower connecting rod 205. The right end of the push rod 301 is set on the side wall of the positioning ring 208 to prevent the push rod 301 from affecting the rotation of the second upper connecting rod 204 and the second lower connecting rod 205.

[0046] The body 304 of the adjustment box is located at the left end of the sliding plate 302 and on the left side of the second hinge shaft 206 away from the first hinge shaft 203. The body 304 has a cavity inside and a clearance hole is provided on the right side wall of the body 304 to allow the push rod 301 to pass through. The left end of the push rod 301 passes through the clearance hole into the body 304.

[0047] The rotating cam 305 is rotatably disposed within the cavity of the box 304. A cam shaft is disposed on the rear side wall of the box 304, perpendicular to the rear side wall of the box 304. The rotating cam 305 is sleeved on the cam shaft, with the cam shaft as the rotation center. The rotating cam 305 has a major axis and a minor axis. The left end of the push rod 301 abuts against the side wall of the rotating cam 305. As the rotating cam 305 rotates, the push rod 301 is displaced in the left and right directions, thereby changing the position of the second hinge shaft 206.

[0048] In the initial state, the end point of the short shaft of the rotating cam 305 is set close to the second hinge shaft 206. At this time, the height of the first lifting connecting rod group and the second lifting connecting rod group is at its shortest. When the rotating cam 305 is rotated, the distance between the rightmost side wall of the rotating cam 305 and the cam shaft gradually increases. The second hinge shaft 206 and the first hinge shaft 203 gradually approach each other, and the height of the first lifting connecting rod group and the second lifting connecting rod group gradually increases, thereby opening the intervertebral space.

[0049] The rotating knob 306 is rotatably mounted on the front side wall of the box 304. The front end of the rotating knob 306 is located outside the box 304, which facilitates the rotation of the rotating knob 306. The rear end of the rotating knob 306 is mounted on the front side wall of the rotating cam 305. The rotating knob 306 can drive the rotating cam 305 to rotate.

[0050] A ratchet 307 is provided on the rear side wall of the rotating cam 305. The ratchet 307 is arranged parallel to the rear side wall of the housing 304. A rotation locking member 308 matching the ratchet 307 is provided on the rear side wall of the housing 304. The ratchet 307, in conjunction with the rotation locking member 308, limits the rotation direction of the rotating cam 305, prevents the rotating cam 305 from retracting, increases the stability of the device during use, and maintains the opening height of the intervertebral space.

[0051] The ratchet 307 has toothed blocks on its circumference, which are evenly distributed along the circumference of the ratchet 307. A fixed shaft is provided on the rear side wall of the housing 304. The rotation locking member 308 is rotatably sleeved on the fixed shaft. A torsion spring is provided between the rotation locking member 308 and the fixed shaft. A one-way positioning tooth is provided on the side wall of the rotation locking member 308. The one-way positioning tooth matches the toothed blocks on the circumference of the ratchet 307. The torsion spring restricts the rotation direction of the rotation locking member 308. The one-way positioning tooth is embedded between the toothed blocks on the circumference of the ratchet 307. Under the action of the one-way positioning tooth, the ratchet 307 is restricted to having a one-way rotational degree of freedom.

[0052] Two sets of pointers are provided on the front side wall of the rotary knob 306, namely the short axis pointer 309 and the long axis pointer 310. The short axis pointer 309 is set along the short axis direction of the rotary cam 305, and the long axis pointer 310 is set along the long axis direction of the rotary cam 305. The length of the short axis pointer 309 is less than the length of the long axis pointer 310. The short axis pointer 309 and the long axis pointer 310 facilitate the positioning of the short axis and long axis of the rotary cam 305.

[0053] The front side wall of the rotary knob 306 is provided with a first instrument slot 311, which can be an internal hexagonal slot, a slot-shaped slot, or a cross-shaped slot, to facilitate the insertion of instruments and the rotation of the rotary knob 306.

[0054] The front wall of the box 304 is provided with a scale 312, which is distributed around the circumference of the rotary knob 306, so as to facilitate the quantification of the rotation angle of the rotary knob 306.

[0055] Combination Figure 1 as well as Figure 4 The angle adjustment component is used to adjust the angle of the vertebral body 101. The first end of the angle adjustment component is set on the pedicle screw, and the second end is connected to the first lifting connecting rod group / second lifting connecting rod group. By adjusting the position of the second end of the angle adjustment component, the angle of the angle adjustment component can be adjusted, thereby adjusting the position and angle of the pedicle screw. The change in the position of the pedicle screw in the anterior-posterior direction leads to the adjustment of the angle of the vertebral body 101 in the anterior-posterior direction, thereby realizing the correction of the angle of the vertebral body 101.

[0056] The angle adjustment component of the vertebral body 101 above is used as an example for description. The angle adjustment component includes an adjustment outer cylinder 402 and a connecting rod 403. The upper end of the connecting rod 403 is inserted into the nail seat 102 of the pedicle screw on the left side of the vertebral body 101 and fixed in the nail seat 102 of the pedicle screw on the left side of the vertebral body 101.

[0057] The connecting rod 403 is set along the length of the adjusting outer cylinder 402, and the lower end of the connecting rod 403 passes through the upper side wall of the adjusting outer cylinder 402 and enters the adjusting outer cylinder 402.

[0058] An anti-detachment block 404 is provided on the outer side of the connecting rod 403. The anti-detachment block 404 is set perpendicular to the connecting rod 403. The upper side wall of the anti-detachment block 404 abuts against the inner side wall of the upper end of the adjusting outer cylinder 402 to prevent the connecting rod 403 from falling out of the adjusting outer cylinder 402 during the use of the device.

[0059] The outer wall of the connecting rod 403 and the upper side wall of the adjusting outer cylinder 402 are fitted with a clearance to facilitate the adjustment of the angle of the connecting rod 403.

[0060] The lower end of the connecting rod 403 is provided with an adjustment tip 405. The lowest point of the adjustment tip 405 is located at the center of the connecting rod 403, and the lowest point of the adjustment tip 405 rests against the side wall of the angle adjustment column 406.

[0061] Angle adjustment column 406 is set perpendicular to the length direction of adjustment outer cylinder 402. Angle adjustment column 406 passes through the front side wall of adjustment outer cylinder 402 and enters the adjustment outer cylinder 402. Adjusting the displacement of angle adjustment column 406 in the front and back direction drives the change of position of adjustment tip 405, thereby realizing the adjustment of the angle of connecting rod 403.

[0062] The outer wall of the angle adjustment column 406 is provided with a thread 407. The angle adjustment column 406 is connected to the thread 407 on the front side wall of the adjustment outer cylinder 402. A thread 407 groove is formed between the threads 407 on the outer wall of the angle adjustment column 406. The thread 407 groove is spiral. The rightmost end of the adjustment tip 405 abuts against the thread 407 groove.

[0063] A second instrument slot 408 is provided on the front side wall of the angle adjustment column 406. The second instrument slot 408 can be an internal hexagonal slot, a slot-shaped slot, or a cross-shaped slot, which facilitates the insertion of instruments and the rotation of the angle adjustment column 406.

[0064] During the rotation of the angle adjustment column 406, the angle adjustment column 406 moves in the front-back direction, causing the rightmost end of the adjustment tip 405 to move in the front-back direction, thereby adjusting the angle of the connecting rod 403. The position of the upper end of the connecting rod 403 changes, causing the position of the pedicle screw to move, thereby moving the vertebral body 101 at the position of the pedicle screw, and thus adjusting the angle of the vertebral body 101 in the front-back plane.

[0065] The angle adjustment column 406 is cylindrical, which makes it easy for the angle adjustment column 406 to rotate into the adjustment outer cylinder 402.

[0066] Combination Figure 1 as well as Figure 4 Taking the installation of the angle adjustment component of the upper vertebral body 101 as an example, the installation instructions for the angle adjustment component are as follows: The upper end of the connecting rod 403 is inserted into the lower opening of the adjusting outer cylinder 402, and the upper end of the connecting rod 403 extends out of the upper side wall of the adjusting outer cylinder 402. The upper side wall of the anti-detachment block 404 abuts against the inner side wall of the upper end of the adjusting outer cylinder 402. Adjust the angle of the connecting rod 403 so that the adjusting tip 405 is close to the rear side wall of the adjusting outer cylinder 402; Install the angle adjusting column 406 on the front side wall of the adjusting outer cylinder 402, rotate the angle adjusting column 406, and the angle adjusting column 406 moves to the rear until the adjusting tip 405 of the connecting rod 403 slides into the threaded groove 407 on the outer side wall of the angle adjusting column 406. Release the restriction on the connecting rod 403 and continue to rotate the angle adjusting column 406. As the angle adjusting column 406 moves backward, the thread 407 groove rotates, driving the adjusting tip 405 to move forward until the connecting rod 403 is parallel to the adjusting outer cylinder 402, and then stop rotating.

[0067] After the angle adjustment components on both sides are installed, the connecting rods 403 on both sides are respectively inserted into the nail seats 102 of the two sets of pedicle screws on the same vertebral body 101. According to actual needs, the angle adjustment columns 406 on both sides are rotated to adjust the angle of the connecting rods 403 on both sides, thereby driving the angle of the vertebral body 101 to be adjusted.

[0068] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An adjustable spinal internal fixation system, characterized in that, include: Two sets of fixation components are respectively installed on two adjacent sets of vertebrae; each set of fixation components includes two sets of pedicle screws and two sets of angle adjustment components; the two sets of pedicle screws are respectively installed on the left and right sides of the corresponding vertebrae, and the angle adjustment components are installed in one-to-one correspondence with the pedicle screws, with the angle adjustment components located on the side of the pedicle screws closer to the other set of vertebrae. The first lifting connecting rod assembly has its upper end connected to the angle adjustment component on the upper left side and its lower end connected to the angle adjustment component on the lower left side. The second lifting connecting rod group is arranged crosswise with the first lifting connecting rod group, and its upper end is connected to the angle adjustment component on the upper right side, and its lower end is connected to the angle adjustment component on the lower right side. as well as A pusher is laterally connected to the middle of the first lifting connecting rod group and the middle of the second lifting connecting rod group. The pusher is used to push the first lifting connecting rod group and the second lifting connecting rod group to swing, so as to change the intersection angle of the first lifting connecting rod group and the second lifting connecting rod group and realize the opening of the intervertebral space.

2. The adjustable spinal internal fixation system as described in claim 1, characterized in that, The first lifting connecting rod assembly includes: The upper end of the first upper connecting rod is hinged to the angle adjustment component on the upper left side; The upper end of the first lower connecting rod is hinged to the lower end of the first upper connecting rod via a first hinge shaft, and the lower end is hinged to the angle adjustment member on the lower left side. The second lifting connecting rod assembly includes: The upper end of the second upper connecting rod is hinged to the angle adjustment component on the upper right side; The upper end of the second lower connecting rod is hinged to the lower end of the second upper connecting rod via the second hinge shaft, and the lower end is hinged to the angle adjustment component on the lower right side. The pusher is located on the side of the second hinge shaft.

3. An adjustable spinal internal fixation system as described in claim 2, characterized in that, The middle part of the first upper link is hinged to the middle part of the second upper link, and the middle part of the first lower link is hinged to the middle part of the second lower link.

4. An adjustable spinal internal fixation system as described in claim 3, characterized in that, The pushing component includes: The sliding plate has a sliding groove extending along the width direction of the cone; the rear ends of the first hinge shaft and the second hinge shaft are slidably disposed within the sliding groove. An adjustment box is disposed at the first end of the sliding plate and near the second hinge axis; The push rod has its first end inserted into the adjustment box and its second end abutting against the side wall of the second hinge shaft. The adjusting box pushes the push rod to slide, and the push rod pushes the second hinge shaft, causing the first lifting connecting rod group and the second lifting connecting rod group to swing, so as to change the intersection angle of the first lifting connecting rod group and the second lifting connecting rod group.

5. An adjustable spinal internal fixation system as described in claim 4, characterized in that, The adjustment box includes: Box body; A rotating shaft is located on the rear side wall of the housing. A rotating cam is rotatably mounted on the rotating shaft, and the first end of the push rod abuts against the side wall of the rotating cam; and A rotary knob is rotatably mounted on the front side wall of the housing, and the rear side wall of the rotary knob is mounted on the front side wall of the rotary cam.

6. An adjustable spinal internal fixation system as described in claim 5, characterized in that, A pointer for indicating the position of the rotating cam is provided on the front side wall of the rotary knob.

7. An adjustable spinal internal fixation system as described in claim 1, characterized in that, The first end of the angle adjustment component is disposed on the pedicle screw, and the second end of the angle adjustment component is hinged to the first lifting connecting rod group / the second lifting connecting rod group. The angle adjustment component is used to adjust the angle of the first lifting connecting rod group / the second lifting connecting rod group.

8. An adjustable spinal internal fixation system as described in claim 7, characterized in that, The angle adjustment component includes: The connecting rod has its first end mounted on the pedicle screw and its second end inserted into the first end of the adjusting outer cylinder. Adjusting the outer cylinder, wherein the second end of the adjusting outer cylinder is hinged to the first lifting connecting rod assembly / the second lifting connecting rod assembly; and An angle adjustment column is provided through the front side wall of the adjustment outer cylinder; The second end of the connecting rod abuts against the side wall of the angle adjusting column, adjusting the displacement of the angle adjusting column in the front-back direction, and adjusting the relative angle between the connecting rod and the adjusting outer cylinder.

9. An adjustable spinal internal fixation system as described in claim 8, characterized in that, The outer wall of the angle adjusting column is provided with threads, and the angle adjusting column is threadedly connected to the front wall of the adjusting outer cylinder; The second end of the connecting rod is provided with an adjustment tip, which abuts against the threaded groove on the outer side wall of the angle adjustment column.

10. An adjustable spinal internal fixation system as described in claim 8, characterized in that, The second end of the adjusting outer cylinder is adapted for the connecting rod to pass through.

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