Transverse connecting device for internal fixation of spine and internal fixation system of spine

Abstract

The utility model belongs to the technical field of medical instruments, and discloses a transverse connecting device for internal fixation of a spine and an internal fixation system of the spine, the transverse connecting device for internal fixation of the spine comprises a locking assembly and at least two connecting mechanisms, and the at least two connecting mechanisms are rotatably connected; the joint of the at least two connecting mechanisms is detachably connected with a locking assembly so as to lock the at least two connecting mechanisms; the connecting mechanism comprises a transverse connecting head and an adjusting assembly, and the transverse connecting head can be fixedly connected to the connecting rod; one end of the adjusting assembly is rotationally connected to the transverse connector, and the other end of the adjusting assembly is provided with a low-incisura part which is rotationally connected to the low-incisura parts of other connecting mechanisms; the length of the adjusting assembly is adjustable. According to the transverse connecting device for internal fixation of the spine, the connecting stability is improved, the transverse connecting device is formed by assembling a plurality of modularized connecting mechanisms, maintenance is convenient, the maintenance cost is reduced, meanwhile, the connecting positions of the connecting mechanisms are arranged in a low-incisura mode, the overall height is reduced, and the reliability is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of medical devices, in particular to a transverse connection device for spinal internal fixation and a spinal internal fixation system. Background Art

[0002] For patients with scoliosis, spondylolisthesis, vertebral compression fractures, etc., a thoracic and lumbar posterior internal fixation system is often required to maintain the physiological curvature of the thoracic and lumbar posterior spine and perform reduction, fixation, fusion, and correction.

[0003] The commonly used transverse connection devices in the existing posterior thoracic and lumbar internal fixation systems include two types: hook-type transverse connection devices and snap-on transverse connection devices. Among them, the snap-on transverse connection device is a rod-type connection, which includes a connecting rod and two transverse connection blocks arranged at both ends of the connecting rod. The connection method is to clamp the two transverse connection blocks on the corresponding connecting rods respectively, and then adjust the length and tighten the connecting rod by a clamping nut. This connection method has too high requirements on the deformation area accuracy of the transverse connection block. If the deformation area is too large, the clamping force will be too large, resulting in plastic deformation of the transverse connection block and product failure; if the deformation area is too small, the clamping force will be reduced, resulting in too low strength of the transverse connection block and poor stability.

[0004] The hook-type cross-connection device is a bridge-type connection, which includes two cross-connection hooks with adjustable relative positions. The connection method is to clamp the two cross-connection hooks on the connecting rod, adjust the cross-connection hook on one side to clamp on the other connecting rod, and lock the two cross-connection hooks with the locking nut in the middle. This connection method has a convex middle and a high notch; if part of the structure is damaged during use, the entire cross-connection device will be unusable.

[0005] Furthermore, during the recovery process of the above two transverse connecting devices after being fixed, since no locking mechanism is provided, the connection between the transverse connecting device and the connecting rod may become loose, resulting in a poor recovery effect.

[0006] Therefore, there is an urgent need for a transverse connection device for spinal internal fixation and a spinal internal fixation system to solve the above technical problems. Utility Model Content

[0007] One purpose of the utility model is to provide a transverse connection device for spinal internal fixation, which can improve the stability of the connection and is assembled into a plurality of modular connection mechanisms, which is convenient for maintenance and reduces maintenance costs. At the same time, the connection points between the plurality of modules are set with low notches, which reduces the overall height and improves reliability.

[0008] To achieve this purpose, the utility model adopts the following technical solutions:

[0009] A transverse connection device for spinal internal fixation comprises a locking assembly and at least two connecting mechanisms, wherein at least two of the connecting mechanisms are rotatably connected to each other; the locking assembly is detachably connected to the connection of at least two of the connecting mechanisms, so that the locking assembly locks at least two of the connecting mechanisms; the connecting mechanisms comprise:

[0010] A transverse connector, which can be fixedly connected to the connecting rod;

[0011] The adjusting component has one end rotatably connected to the above-mentioned transverse connecting head, and the other end is provided with a low-profile portion, and the above-mentioned low-profile portion is rotatably connected to the above-mentioned low-profile portion of the other above-mentioned connecting mechanism; the length of the above-mentioned adjusting component is adjustable.

[0012] Optionally, the adjustment assembly comprises a first connecting rod, a second connecting rod and an adjusting screw sleeve;

[0013] One end of the first connecting rod is rotatably connected to the horizontal connecting head, and the other end is provided with a first external thread, and the first external thread is threadedly connected to the adjusting screw sleeve;

[0014] One end of the second connecting rod is provided with a second external thread, the second external thread is threadedly connected to the adjusting screw sleeve, and the other end is provided with the low cut portion;

[0015] The adjusting screw sleeve is configured to adjust the distance between the first connecting rod and the second connecting rod.

[0016] Optionally, the two ends of the adjusting screw sleeve are respectively provided with a first threaded hole and a second threaded hole, one of the first threaded hole and the second threaded hole is provided with a left-handed internal thread, and the other is provided with a right-handed internal thread, one of the first external thread and the second external thread is a left-handed external thread, and the other is a right-handed external thread, the left-handed external thread and the left-handed internal thread are threadedly connected, and the right-handed external thread and the right-handed internal thread are threadedly connected.

[0017] Optionally, the adjustment assembly further comprises a locking nut, which is arranged on one side of the adjusting screw sleeve along its own axial direction, and the locking nut is threadedly connected to the first connecting rod or the second connecting rod to tighten or loosen the adjusting screw sleeve.

[0018] Optionally, the thickness of the low-profile portion is smaller than the diameter of the body of the second connecting rod.

[0019] Optionally, two connecting surfaces of the low-profile portion arranged opposite to each other are provided with anti-slip teeth, and the anti-slip teeth on the low-profile portion of one of the connecting mechanisms are meshed with the anti-slip teeth on the low-profile portion of the other connecting mechanisms.

[0020] Optionally, the locking assembly includes a screw and two fixing nuts, one end of the screw is passed through the low-profile portions of all the connecting mechanisms and is threadedly connected to the two fixing nuts.

[0021] Optionally, the above-mentioned cross-connecting head includes a cross-connecting hook and a clamping nut, one end of the above-mentioned cross-connecting hook is rotatably connected to the above-mentioned adjustment assembly, and the other end can be clamped on the connecting rod; the above-mentioned clamping nut is detachably connected to the above-mentioned cross-connecting hook, and the above-mentioned clamping nut and the above-mentioned cross-connecting hook can lock and fix the above-mentioned connecting rod.

[0022] Optionally, the above-mentioned transverse connecting head includes a screw seat connecting piece and a top screw, the above-mentioned screw seat connecting piece can be connected to the pedicle screw in a limiting position, the above-mentioned top screw is passed through the above-mentioned screw seat connecting piece and can be detachably connected to the above-mentioned pedicle screw, and the above-mentioned top screw is used to lock the above-mentioned connecting rod to the above-mentioned pedicle screw.

[0023] Another object of the utility model is to provide a spinal internal fixation system, which can improve the stability of the connection and is assembled into multiple modular connection mechanisms, which is easy to maintain and reduces maintenance costs. At the same time, the connections between the multiple modules are set with low notches, which reduces the overall height and improves reliability.

[0024] To achieve this purpose, the utility model adopts the following technical solutions:

[0025] A spinal internal fixation system comprises two connecting rods, a plurality of pedicle screws and a plurality of transverse connecting devices for spinal internal fixation as described in any of the above schemes, wherein the plurality of pedicle screws are arranged at intervals at spinal internal fixation positions, the two connecting rods are arranged at intervals and fixedly connected to the pedicle screws, and the transverse connecting device for spinal internal fixation is connected between two adjacent connecting rods.

[0026] Beneficial effects of the utility model:

[0027] The utility model provides a transverse connection device and a spinal fixation system for spinal internal fixation. The transverse connection head of a connection mechanism to be fixed on a connecting rod is fixedly connected to the connecting rod, and then the length of the adjustment component is adjusted so that the transverse connection head of a connection mechanism to be fixed on another connecting rod is fixedly connected to the connecting rod; in this process, the angle between each connection mechanism can be determined according to actual needs, and then each connection mechanism is locked and fixed by a locking component, that is, the transverse connection and fixation of two connecting rods are completed. In addition, the modular setting of the connection mechanism ensures that when a part of the structure in a connection mechanism fails or a part of the structure in the locking component fails, the connection mechanism or the locking component can be directly replaced without replacing the entire transverse connection device, which is convenient for the maintenance of the transverse connection device for spinal internal fixation and reduces the maintenance cost. At the same time, a low notch portion is provided at the connection between the connection mechanisms, which reduces the height of the connection of each connection mechanism, thereby reducing the height of the entire device, and further reducing the discomfort of the patient such as bulge, pain and itching. In addition, the setting of the locking component avoids the slippage phenomenon at the connection of each connection mechanism during use, and improves the stability of the connection. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a partial cross-sectional view of a transverse connection device for spinal internal fixation provided by some embodiments of the utility model;

[0029] Figure 2 It is a top view of a transverse connection device for spinal internal fixation provided by some embodiments of the utility model;

[0030] Figure 3 It is a partial cross-sectional view of a transverse connection device for spinal internal fixation provided by other embodiments of the utility model;

[0031] Figure 4 It is a top view of a transverse connection device for spinal internal fixation provided by other embodiments of the utility model;

[0032] Figure 5 It is a top view of a transverse connection device for spinal internal fixation having two first connection mechanisms provided by some embodiments of the utility model;

[0033] Figure 6 It is a top view of a transverse connection device for spinal internal fixation having three first connection mechanisms provided by some embodiments of the utility model;

[0034] Figure 7 It is a top view of a transverse connection device for spinal internal fixation having four first connection mechanisms provided by some embodiments of the utility model;

[0035] Figure 8It is a top view of a transverse connection device for spinal internal fixation having two second connection mechanisms provided by other embodiments of the utility model;

[0036] Fig. 9 It is a top view of a transverse connection device for spinal internal fixation having three second connection mechanisms provided by other embodiments of the utility model;

[0037] Fig.10 It is a top view of a transverse connection device for spinal internal fixation having four second connection mechanisms provided by other embodiments of the utility model;

[0038] Fig.11 It is a structural schematic diagram of an adjusting nut provided in a specific embodiment of the utility model;

[0039] Fig.12 It is a cross-sectional view of an adjusting nut provided in a specific embodiment of the utility model;

[0040] Fig.13 is a top view of a first connecting rod provided in a specific embodiment of the utility model;

[0041] Fig.14 is a partial cross-sectional view of a first connecting rod provided in a specific embodiment of the utility model;

[0042] Fig.15 is a front view of a second connecting rod provided in a specific embodiment of the utility model;

[0043] Fig.16 is a top view of a second connecting rod provided in a specific embodiment of the utility model;

[0044] Fig.17 It is a front view of a horizontal connecting hook provided by a specific embodiment of the utility model;

[0045] Fig.18 It is a top view of a horizontal connecting hook provided in a specific embodiment of the utility model;

[0046] Fig.19 It is a front view of a compression nut provided in a specific embodiment of the utility model;

[0047] Fig. 20 It is a cross-sectional view of a compression nut provided in a specific embodiment of the utility model;

[0048] Fig.21 It is a front view of a nail seat connector provided in a specific embodiment of the utility model;

[0049] Fig. 22 It is a top view of a nail seat connector provided in a specific embodiment of the utility model;

[0050] Fig.23 It is a front view of a screw provided in a specific embodiment of the utility model.

[0051] In the figure:

[0052] 10. Connecting mechanism; 11. Horizontal connecting head; 111. Horizontal connecting hook; 1111. Mounting hole; 112. Compression nut; 1121. Threaded portion; 1122. Limiting portion; 113. Nail seat connector; 114. Top screw; 115. Second connecting portion; 1151. Second pin hole; 12. Adjusting assembly; 121. First connecting rod; 1211. First external thread; 1212. First connecting portion; 12121. Slot; 12122. First pin hole; 122. Second connecting rod; 1221. Low cut portion; 12211. Anti-slip teeth; 12212. Through hole; 1222. Main body; 12221. Second external thread; 123. Adjusting screw sleeve; 1231. First threaded hole; 1232. Second threaded hole; 1233. Rotating portion; 1234. Connecting portion; 124. Locking nut;

[0053] 20. Locking assembly; 21. Screw; 211. Limiting cap; 212. Rod body; 22. Fixing nut;

[0054] 30. Tighten the fixing pin;

[0055] 200. Connecting rod; 300. Pedicle screw. DETAILED DESCRIPTION

[0056] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only the parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0057] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0058] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0059] In the description of this embodiment, the terms "upper", "lower", "right", etc., are based on the directions or positions shown in the drawings, and are only for the convenience of description and simplification of operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0060] See below Figures 1 to 23 The utility model is provided with a specific embodiment to introduce a transverse connection device for spinal internal fixation and a spinal internal fixation system.

[0061] Please refer to Figures 1 to 4 Specifically, the transverse connection device for spinal internal fixation includes a locking assembly 20 and at least two connecting mechanisms 10, and the at least two connecting mechanisms 10 are rotatably connected to each other; the locking assembly 20 is detachably connected to the connection between the at least two connecting mechanisms 10, so that the locking assembly 20 locks the at least two connecting mechanisms 10; the connecting mechanism 10 includes a transverse connecting head 11 and an adjusting assembly 12, and the transverse connecting head 11 can be fixedly connected to the connecting rod 200; one end of the adjusting assembly 12 is rotatably connected to the transverse connecting head 11, and the other end is provided with a low notch portion 1221, and the low notch portion 1221 is rotatably connected to the low notch portion 1221 of other connecting mechanisms 10; the length of the adjusting assembly 12 is adjustable.

[0062] The transverse connection device for spinal internal fixation of this embodiment, when performing transverse connection and fixation of two connecting rods 200, the transverse connection head 11 of the connecting mechanism 10 to be fixed on one connecting rod 200 is fixedly connected to the connecting rod 200, and then the length of the adjustment component 12 is adjusted so that the transverse connection head 11 of the connecting mechanism 10 to be fixed on the other connecting rod 200 is fixedly connected thereto; in this process, the angle between each connecting mechanism 10 can be determined according to actual needs, and then each connecting mechanism 10 is locked and fixed by the locking component 20, that is, the transverse connection and fixation of the two connecting rods 200 is completed. The transverse connection device for spinal internal fixation modularizes the connecting mechanism 10, ensuring that when a part of the structure in a connecting mechanism 10 or a part of the structure in the locking component 20 fails, the connecting mechanism 10 or the locking component 20 can be directly replaced without replacing the entire transverse connection device, which facilitates the maintenance of the transverse connection device for spinal internal fixation and reduces the maintenance cost. At the same time, the connection between the connection mechanisms 10 is provided with a low notch 1221, which reduces the height of the connection between the connection mechanisms 10, thereby reducing the height of the entire device, and further reducing the discomfort such as bulging, pain and itching caused by the patient. In addition, the setting of the locking assembly 20 avoids the slippage of the connection between the connection mechanisms 10 during use, thereby improving the stability of the connection.

[0063] Please refer to Figures 5 to 10 Optionally, the number of the connecting mechanisms 10 can be two, three, four, etc., which is not specifically limited here.

[0064] Please refer to Figure 5 and Figure 8 In an optional embodiment, two connecting mechanisms 10 are provided, and the two connecting mechanisms 10 are respectively connected to two connecting rods 200 .

[0065] Please refer to Figure 6 and Fig. 9 In an optional embodiment, when there are three connecting mechanisms 10, one of the three connecting mechanisms 10 is connected to a connecting rod 200, and the other two are connected to another connecting rod 200, and the other two are arranged at a certain angle, so that a triangle is formed between the two connecting rods 200 and the connecting rods 200 connected thereto, thereby improving the stability of the transverse connection device for spinal internal fixation.

[0066] Please refer to Figure 7 and Fig.10 In an optional embodiment, four connecting mechanisms 10 are provided, two of the four connecting mechanisms 10 are connected to one connecting rod 200 at an angle, and the other two are connected to another connecting rod 200 at an angle, further improving the stability of the transverse connection device for spinal internal fixation.

[0067] Please continue to refer to Figures 1 to 4 In this embodiment, the adjusting component 12 includes a first connecting rod 121, a second connecting rod 122 and an adjusting screw sleeve 123; one end of the first connecting rod 121 is rotatably connected to the cross-connection head 11, so that the angle between the connecting rod 200 and the adjusting component 12 can be adjusted; the other end of the first connecting rod 121 is provided with a first external thread 1211, and the first external thread 1211 is threadedly connected to the adjusting screw sleeve 123; one end of the second connecting rod 122 is provided with a second external thread 12221, and the second external thread 12221 is threadedly connected to the adjusting screw sleeve 123, and the other end is provided with a low cut portion 1221; the rotation directions of the first external thread 1211 and the second external thread 12221 are opposite; the adjusting screw sleeve 123 is configured to be able to adjust the distance between the first connecting rod 121 and the second connecting rod 122.

[0068] When in use, after the two connecting rods 200 are installed, the transverse connection device for spinal internal fixation is installed. First, a transverse connecting head 11 is installed with the corresponding connecting rod 200, and then the adjusting screw sleeve 123 is rotated to adjust the relative position between the first connecting rod 121 and the adjusting screw sleeve 123, and the relative position between the second connecting rod 122 and the first connecting rod 121 is adjusted at the same time, so as to adjust the length of the adjustment component 12 to the installation position, and then the other transverse connecting head 11 can be installed on the other connecting rod 200 for fixation to complete the installation.

[0069] Please refer to Figures 11 to 16 Further, the two ends of the adjusting screw sleeve 123 are respectively provided with a first threaded hole 1231 and a second threaded hole 1232, one of the first threaded hole 1231 and the second threaded hole 1232 is provided with a left-handed internal thread, and the other is provided with a right-handed internal thread, one of the first external thread 1211 and the second external thread 12221 is a left-handed external thread, and the other is a right-handed external thread, the left-handed external thread is threadedly connected with the left-handed internal thread, and the right-handed external thread is threadedly connected with the right-handed internal thread. In this way, when the adjusting component 12 is adjusted in length, it only needs to rotate the adjusting screw sleeve 123 forward or backward to adjust the position between the first connecting rod 121 and the second connecting rod 122, which improves convenience.

[0070] Illustratively, in this embodiment, the first external thread 1211 is a left-handed external thread, the first threaded hole 1231 is provided with a left-handed internal thread, the second external thread 12221 is a right-handed external thread, the second threaded hole 1232 is provided with a right-handed internal thread, the first threaded hole 1231 is arranged toward the first connecting rod 121, and the second threaded hole 1232 is arranged toward the second connecting rod 122, so that the adjusting screw sleeve 123 can be threadedly connected to the first connecting rod 121 and the second connecting rod 122 respectively.

[0071] Please continue to refer to Fig.11 and Fig.12Optionally, the adjusting screw sleeve 123 is provided with a rotating portion 1233 and two connecting portions 1234, the two connecting portions 1234 are respectively provided on both sides of the rotating portion 1233, one of the two connecting portions 1234 is provided with a first threaded hole 1231, and the other is provided with a second threaded hole 1232; the outer diameter of the rotating portion 1233 is greater than the outer diameter of the connecting portion 1234. When in use, the adjusting screw sleeve 123 can be rotated by rotating the rotating portion 1233, thereby improving the convenience during use.

[0072] Please refer to Figures 1 to 4 Furthermore, the adjusting component 12 also includes a locking nut 124, which is arranged on one side of the adjusting screw sleeve 123 along its own axial direction. The locking nut 124 is threadedly connected to the first connecting rod 121 or the second connecting rod 122 to tighten or loosen the adjusting screw sleeve 123. The setting of the locking nut 124 can limit the movement of the adjusting screw sleeve 123 along its own axial direction, that is, after the relative positions of the first connecting rod 121 and the second connecting rod 122 are determined, the locking nut 124 is abutted against the adjusting screw sleeve 123, so that the relative position between the first connecting rod 121 and the second connecting rod 122 can be locked, thereby improving the reliability of the adjusting component 12, avoiding the loosening and rotation of the adjusting screw sleeve 123 during use, thereby preventing the first connecting rod 121 and the second connecting rod 122 from slipping, thereby avoiding the problem of loosening of the transverse connecting device for spinal fixation, and improving the reliability of the transverse connecting device for spinal fixation.

[0073] In some embodiments, the first connecting rod 121 and the cross-connecting head 11 are connected via a fixing pin 30 to achieve a rotational connection between the two.

[0074] Please refer to Fig.13 , Fig.14 , Fig.17 and Fig.18 Specifically, a first connecting portion 1212 is provided at one end of the first connecting rod 121, and a first pin hole 12122 is opened on the first connecting portion 1212; the cross-connecting head 11 is provided with a second connecting portion 115, and a second pin hole 1151 is opened on the second connecting portion 115. The locking pin 30 sequentially transmits the first pin hole 12122 and the second pin hole 1151 and fastens the two together, thereby realizing the rotation and fixed connection between the two.

[0075] Furthermore, the first connecting portion 1212 is provided with a slot 12121 , and the second connecting portion 115 is inserted into the slot 12121 , so that the connection between the two can be achieved, ensuring that the first pin hole 12122 and the second pin hole 1151 are aligned.

[0076] Please refer to Fig.15 and Fig.16In some embodiments, the thickness of the low-profile portion 1221 is less than the diameter of the body of the second connecting rod 122, which reduces the height of the connection between the low-profile portions 1221, thereby reducing the height of the entire device, and further reducing the discomfort such as bulging, pain and itching caused by the patient. Specifically, the second connecting rod 122 includes a main body portion 1222 and a low-profile portion 1221 connected to each other, and the main body portion 1222 is provided with a second external thread 12221. The thickness of the low-profile portion 1221 is less than the diameter of the main body portion 1222, which can ensure that the height of multiple low-profile portions 1221 after being superimposed and connected will not be too high, thereby achieving the low-profile treatment of the transverse connection device for spinal internal fixation.

[0077] Optionally, the number of connecting mechanisms 10 is N, the thickness of the low-profile portion 1221 is A, the diameter of the main body 1222 is D, and A*N≤D. This ensures that the low-profile portions 1221 of each connecting mechanism 10 will not cause significant discomfort to the skin or bones when stacked together.

[0078] Exemplarily, in the present embodiment, the thickness of the low-profile portion 1221 is half the diameter of the main body portion 1222 , which not only ensures the strength of the low-profile portion 1221 , but also enables low-profile processing at the connection points of each low-profile portion 1221 .

[0079] Furthermore, two connecting surfaces of the low-profile portion 1221 that are arranged opposite to each other are provided with anti-slip teeth 12211. The anti-slip teeth 12211 on the low-profile portion 1221 of one connecting mechanism 10 are meshed with the anti-slip teeth 12211 of the low-profile portion 1221 of other connecting mechanisms 10, thereby improving the connection strength between each low-profile portion 1221. At the same time, after the locking assembly 20 locks it, no sliding will occur between the two connected low-profile portions 1221, thereby improving the reliability of the transverse connection device for spinal internal fixation after installation.

[0080] Furthermore, the low-profile portion 1221 is also provided with a through hole 12212, and the through hole 12212 is used for the penetration of the locking assembly 20, so as to achieve the locking effect of the locking assembly 20 on each low-profile portion 1221 after connection.

[0081] Please refer to Figures 17 to 20 In an optional embodiment, the transverse connecting head 11 includes a transverse connecting hook 111 and a clamping nut 112, one end of the transverse connecting hook 111 is rotatably connected to the adjustment component 12, and the other end can be clamped on the connecting rod 200; the clamping nut 112 is detachably connected to the transverse connecting hook 111, and the clamping nut 112 and the transverse connecting hook 111 can lock and fix the connecting rod 200, thereby realizing the locking and fixation of the transverse connecting head 11 and the connecting rod 200.

[0082] Specifically, the transverse connecting hook 111 is provided with a mounting hole 1111, one end of the clamping nut 112 is passed through the mounting hole 1111, and the other end is threadedly connected with the mounting hole 1111. When in use, the connecting rod 200 and the pedicle screw 300 are first fixed at a fixed position in the spine, and then the transverse connecting hook 111 is clamped with the connecting rod 200, and one end of the clamping nut 112 is passed through the mounting hole 1111, and the other end of the clamping nut 112 is threadedly connected with the transverse connecting hook 111, so that the connecting rod 200 is compressed between one end of the clamping nut 112 and the transverse connecting hook 111, and the fixed connection between the transverse connecting device for spinal fixation and the connecting rod 200 can be achieved.

[0083] Furthermore, the clamping nut 112 includes a threaded portion 1121 and a limiting portion 1122. The limiting portion 1122 is passed through the mounting hole 1111, and the threaded portion 1121 is connected to the mounting hole 1111. As the threaded portion 1121 is continuously screwed in, the limiting portion 1122 can be pressed against the connecting rod 200, thereby realizing a fixed connection between the transverse connection device for spinal internal fixation and the connecting rod 200.

[0084] Please refer to Fig.21 and Fig. 22 In another optional embodiment, the transverse connecting head 11 includes a screw seat connecting piece 113 and a top screw 114. The screw seat connecting piece 113 can be connected to the pedicle screw 300 in a limited position. The screw seat connecting piece 113 is passed through the screw seat connecting piece 113 and can be detachably connected to the pedicle screw 300. The top screw 114 is used to lock the connecting rod 200 to the pedicle screw 300, thereby realizing the locking and fixation of the transverse connecting head 11 and the connecting rod 200.

[0085] Specifically, a groove body is provided on the pedicle screw 300, and the screw seat connector 113 includes a limiting sleeve and a through hole. The groove wall of the groove body is clamped in the limiting sleeve to achieve the fixation of the screw seat connector 113 and the pedicle screw 300. The top screw 114 can be passed through the through hole and detachably connected to the pedicle screw 300.

[0086] When in use, first fix the pedicle screw 300 at a fixed position in the spine, place the connecting rod 200 at the installation position of the pedicle screw 300, then limit the connection between the screw seat connector 113 and the pedicle screw 300, and then pass the top screw 114 through the screw seat connector 113 and detachably connect it to the pedicle screw 300, so as to tighten the connecting rod 200 in the groove body of the pedicle screw 300, and at the same time achieve a fixed connection between the transverse connecting head 11 and the connecting rod 200.

[0087] Please refer to Fig.10 It is understandable that the transverse connecting heads 11 in the above two optional solutions can also be mixed and used without specific limitation.

[0088] Please refer to Figure 1 , Figure 2, Figure 3 , Figure 4 and Fig.23 In this embodiment, the locking assembly 20 includes a screw rod 21 and two fixing nuts 22. One end of the screw rod 21 is passed through the low-profile portion 1221 of all the connecting mechanisms 10 and is threadedly connected to the two fixing nuts 22, so that during use, the two fixing nuts 22 are locked with each other, thereby improving the anti-retreat ability of the locking assembly 20, avoiding the loosening of the locking assembly 20, and improving the locking reliability of the locking assembly 20.

[0089] Specifically, the screw rod 21 includes a rod body 212 and a limiting cap 211. The rod body 212 is provided with an external thread for threaded connection with the fixing nut 22. The limiting cap 211 is used to limit the position of the screw rod 21, that is, when the rod body 212 is passed through a plurality of low-profile portions 1221, the limiting cap 211 can abut against the end of the low-profile portion 1221 to achieve the limitation of the screw rod 21, thereby ensuring that the locking assembly 20 can lock and fix the plurality of low-profile portions 1221.

[0090] Optionally, the screw rod 21 and the fixing nut 22 are provided with various specifications to adapt to the connection between different numbers of connection mechanisms 10 .

[0091] Specifically, in the present embodiment, only the screw rod 21 is provided with various specifications, that is, the screw rod 21 has different lengths, so as to be used for locking two, three or four connection mechanisms 10 .

[0092] The present embodiment also provides a spinal internal fixation system, which includes two connecting rods 200, a plurality of pedicle screws 300 and a plurality of transverse connection devices for spinal internal fixation as described in any of the above schemes, wherein the plurality of pedicle screws 300 are arranged at intervals at spinal internal fixation positions, the two connecting rods 200 are arranged at intervals and fixedly connected to the pedicle screws 300, and the transverse connection device for spinal internal fixation is connected between two adjacent connecting rods 200.

[0093] The spinal internal fixation system in this embodiment adopts the transverse connection device for spinal internal fixation described in any of the above schemes. After the connecting rod 200 is installed on the pedicle screw 300, the transverse connection device for spinal internal fixation can achieve the stability of fixation between two adjacent connecting rods 200, so as to strengthen the connection between adjacent connecting rods 200 and facilitate the recovery of the spine. At the same time, it also has the beneficial effects of all schemes of the transverse connection device for spinal internal fixation, which will not be repeated here.

[0094] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the scope of protection of the present invention. It is not necessary and impossible to list all implementation methods here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention shall be included in the scope of protection of the claims of the present invention.

Claims

1. A transverse connection device for spinal internal fixation, characterized in that: The invention comprises a locking assembly (20) and at least two connecting mechanisms (10), wherein at least two connecting mechanisms (10) are rotatably connected to each other; the locking assembly (20) is detachably connected to the connection point of at least two connecting mechanisms (10), so that the locking assembly (20) locks at least two connecting mechanisms (10); the connecting mechanism (10) comprises: A transverse connecting head (11), wherein the transverse connecting head (11) can be fixedly connected to the connecting rod (200); An adjusting component (12) has one end rotatably connected to the transverse connecting head (11), and the other end is provided with a low-profile portion (1221), and the low-profile portion (1221) is rotatably connected to the low-profile portion (1221) of the other connecting mechanism (10); the length of the adjusting component (12) is adjustable.

2. The transverse connection device for spinal internal fixation according to claim 1, characterized in that: The adjustment assembly (12) comprises a first connecting rod (121), a second connecting rod (122) and an adjustment screw sleeve (123); One end of the first connecting rod (121) is rotatably connected to the transverse connecting head (11), and the other end is provided with a first external thread (1211), and the first external thread (1211) is threadedly connected to the adjusting screw sleeve (123); One end of the second connecting rod (122) is provided with a second external thread (12221), the second external thread (12221) is threadedly connected to the adjusting screw sleeve (123), and the other end is provided with the low-profile portion (1221); the first external thread (1211) and the second external thread (12221) rotate in opposite directions; The adjusting screw sleeve (123) is configured to be able to adjust the distance between the first connecting rod (121) and the second connecting rod (122).

3. The transverse connection device for spinal internal fixation according to claim 2, characterized in that: The two ends of the adjusting screw sleeve (123) are respectively provided with a first threaded hole (1231) and a second threaded hole (1232); one of the first threaded hole (1231) and the second threaded hole (1232) is provided with a left-handed internal thread, and the other is provided with a right-handed internal thread; one of the first external thread (1211) and the second external thread (12221) is a left-handed external thread, and the other is a right-handed external thread; the left-handed external thread is threadedly connected to the left-handed internal thread, and the right-handed external thread is threadedly connected to the right-handed internal thread.

4. The transverse connection device for spinal internal fixation according to claim 3, characterized in that: The adjustment assembly (12) further comprises a locking nut (124), wherein the locking nut (124) is arranged on one side of the adjustment screw sleeve (123) along its own axial direction, and the locking nut (124) is threadedly connected to the first connecting rod (121) or the second connecting rod (122) to tighten or loosen the adjustment screw sleeve (123).

5. The transverse connection device for spinal internal fixation according to claim 2, characterized in that: The thickness of the low-profile portion (1221) is smaller than the diameter of the body of the second connecting rod (122).

6. The transverse connection device for spinal internal fixation according to claim 1, characterized in that: Two connecting surfaces of the low-profile portion (1221) arranged opposite to each other are both provided with anti-slip teeth (12211), and the anti-slip teeth (12211) on the low-profile portion (1221) of one connecting mechanism (10) are meshed with the anti-slip teeth (12211) of the low-profile portion (1221) of the other connecting mechanism (10).

7. The transverse connection device for spinal internal fixation according to claim 1, characterized in that: The locking assembly (20) comprises a screw rod (21) and two fixing nuts (22), one end of the screw rod (21) being passed through the low-profile portions (1221) of all the connecting mechanisms (10) and being threadedly connected to the two fixing nuts (22).

8. The transverse connection device for spinal internal fixation according to any one of claims 1 to 7, characterized in that: The transverse connecting head (11) comprises a transverse connecting hook (111) and a clamping nut (112); one end of the transverse connecting hook (111) is rotatably connected to the adjusting assembly (12), and the other end can be clamped on the connecting rod (200); the clamping nut (112) is detachably connected to the transverse connecting hook (111), and the clamping nut (112) and the transverse connecting hook (111) can lock and fix the connecting rod (200).

9. The transverse connection device for spinal internal fixation according to any one of claims 1 to 7, characterized in that: The transverse connecting head (11) comprises a screw seat connecting piece (113) and a top screw (114); the screw seat connecting piece (113) can be connected to the pedicle screw (300) in a limiting manner; the top screw (114) is passed through the screw seat connecting piece (113) and is detachably connected to the pedicle screw (300); the top screw (114) is used to lock the connecting rod (200) to the pedicle screw (300).

10. A spinal fixation system, characterized in that: The invention comprises two connecting rods (200), a plurality of pedicle screws (300) and a plurality of transverse connection devices for spinal internal fixation as described in any one of claims 1 to 9, wherein the plurality of pedicle screws (300) are arranged at intervals at spinal internal fixation positions, two connecting rods (200) are arranged at intervals and fixedly connected to the pedicle screws (300), and the transverse connection device for spinal internal fixation is connected between two adjacent connecting rods (200).

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