Improved posterior reduction fixing system for dentation of skull and atlantoaxial dislocation

Abstract

The invention relates to the technical field of medical instruments, in particular to an improved posterior reduction fixing system for skull base depression concurrent atlantoaxial dislocation, which comprises an occipital bone plate, a connecting rod and a locking assembly, the occipital bone plate is used for being connected with the occipital bone, the connecting rod is used for being connected with the axis, and the occipital bone plate is rotatably connected with the connecting rod; the locking assembly is arranged on the connecting rod when the occipital bone plate and the connecting rod are adjusted to a preset angle. According to the atlantoaxial dislocation reduction device, the occipital bone plate and the connecting rod are arranged, the occipital bone plate is connected with the occipital bone, the connecting rod is connected with the axis, the occipital bone plate is rotatably connected with the connecting rod, and the angle between the occipital bone plate and the connecting rod is adjusted through relative rotation of the occipital bone plate and the connecting rod, so that atlantoaxial dislocation is reset to an ideal state; angle adjustment and fixed state switching between the occipital bone plate and the connecting rod are achieved, operation of medical staff is facilitated, and flexible adjustment of the angle between the occipital bone plate and the connecting rod is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of medical devices, and in particular to an improved posterior reduction and fixation system for skull base indentation complicated with atlantoaxial dislocation. Background Art

[0002] Basilar skull invagination is a common deformity of the craniocervical junction, which is often complicated by atlantoaxial dislocation. The odontoid process of the axis is displaced upward and backward and sinks into the skull base, causing compression of important structures such as the medulla oblongata, high cervical spinal cord, cerebellum, and posterior cranial nerves, resulting in corresponding symptoms of neurological damage, and even paralysis and life-threatening consequences.

[0003] At present, the treatment of skull base invagination complicated with atlantoaxial dislocation usually adopts transoral anterior or posterior approach to perform reduction, internal fixation and occipital-cervical fusion on the basis of atlantoaxial joint release. Among them, the posterior approach is widely accepted because of its low risk of infection. During the operation, the axis is pressed forward and downward on the basis of release and skull traction to achieve reduction by relatively moving the skull backward and rotating it backward. However, the force control of the key action of pressing the axis during the reduction operation is completely based on the surgeon's technique, and it is necessary to drill holes in the skull and lock the internal fixation system while pressing and reducing to maintain the reduction effect. The reduction process must be completed in one go, which is more likely to cause iatrogenic spinal cord injury.

[0004] For example, the patent number is CN2022110523306, and the patent name is a Chinese invention patent for an occipital-cervical dislocation reduction instrument. It discloses a fixator structure for posterior reduction of skull base depression complicated by atlantoaxial dislocation. The entire reduction process is controllable, but it lacks the function of adjusting the reduction angle. At the same time, there are few screw holes in the occipital plate, so it is only used as a temporary reduction tool and is not suitable for implantation.

[0005] In view of this, it is particularly important to design and manufacture a reduction and fixation system with adjustable angle and controllable reduction process for application in the treatment of posterior reduction of skull base depression complicated with atlantoaxial dislocation. Summary of the invention

[0006] The purpose of the present invention is to provide a posterior reduction and fixation system for skull base indentation complicated with atlantoaxial dislocation with adjustable angle and controllable reduction process, so as to solve the problems in the prior art that the reduction process is difficult to control and the angle is difficult to adjust, and an improved posterior reduction and fixation system for skull base indentation complicated with atlantoaxial dislocation is proposed.

[0007] In order to achieve the above object, the present invention adopts the following technical solutions: An improved posterior reduction and fixation system for basilar indentation complicated with atlantoaxial dislocation comprises an occipital plate, a connecting rod and a locking assembly, wherein the occipital plate is used to be connected to the occipital bone, the connecting rod is used to be connected to the axis, and the occipital plate and the connecting rod are rotatably connected; the locking assembly is arranged on the connecting rod, and when the occipital plate and the connecting rod are adjusted to a preset angle, the locking assembly is used to lock the rotation of the occipital plate and the connecting rod.

[0008] As a further description of the above technical solution: The invention also includes a gear shaft; the occipital plate includes a connecting plate and a connecting head, the connecting plate is connected to the occipital bone, and the connecting head is arranged at the end of the connecting plate away from the occipital bone; the connecting rod includes a rod body and a connecting seat, the rod body is connected to the axis, and the connecting seat is arranged at the end of the rod body away from the axis; the connecting head and the connecting seat both have a through hole, the inner wall of the through hole of the connecting head has a first gear ring, the inner wall of the through hole of the connecting seat has a second gear ring, the gear shaft passes through the through hole, and is respectively meshed with the first gear ring and the second gear ring.

[0009] As a further description of the above technical solution: The connecting head is provided with two first gear rings; the two first gear rings are arranged opposite to each other, and the second gear ring is sandwiched between them, and the gear shaft passes through the two first gear rings and the second gear rings.

[0010] As a further description of the above technical solution: The connecting seat includes a first seat body, a connecting seat body and a second seat body; the first seat body, the connecting seat body and the second seat body are connected in sequence, and the first seat body is arranged opposite to the second seat body, the first seat body is connected to the rod body, and the connecting seat body has a second gear ring.

[0011] As a further description of the above technical solution: The locking assembly includes: an adjusting screw; a mounting hole is provided on the first seat body, and an arc-shaped opening is provided on the second seat body, and the mounting hole is coaxially arranged with the arc-shaped opening; the adjusting screw is rotatably inserted into the arc-shaped opening and the mounting hole to achieve locking or loosening of the relative rotation between the gear shaft and the connecting seat; the nut of the adjusting screw is adapted to the screwing structure of the wrench to facilitate the operation of the adjusting screw by the wrench.

[0012] As a further description of the above technical solution: A step groove is provided in the arc-shaped opening, and a step hole is provided in the mounting hole; when the adjusting screw is in a locked state, the bottom wall of the step groove abuts against the nut of the adjusting screw to limit the adjusting screw; the step hole limits the screw rod of the adjusting screw to the small head end of the step hole.

[0013] As a further description of the above technical solution: The connecting plate includes a first plate body and a second plate body; the first end of the first plate body is connected to the occipital bone, and the second end of the second plate body is connected to the connecting head; the second end of the first plate body is provided with a sliding groove, and the first end of the second plate body is provided with a sliding block on a side close to the first plate body, and the sliding block is movably provided in the sliding groove to adjust the length of the connecting plate.

[0014] As a further description of the above technical solution: The connecting plate also includes: an adjusting gear and a locking screw; the locking screw is threadedly connected to the first plate body, the adjusting gear is sleeved on the locking screw, the second plate body has a receiving groove, the groove wall on one side of the receiving groove has a rack, the adjusting gear is rotatably arranged in the receiving groove and meshing with the rack.

[0015] As a further description of the above technical solution: A strip hole is provided at the first end of the connecting plate; the strip hole is extended along the length direction of the connecting plate; there are a plurality of the strip holes, and the plurality of the strip holes are arranged at intervals along the length direction of the connecting plate.

[0016] As a further description of the above technical solution: The areas corresponding to two adjacent strip-shaped holes on the connecting plate are provided with arc-shaped folded edges; there are two arc-shaped folded edges, and the two arc-shaped folded edges are respectively arranged on both sides of the connecting plate.

[0017] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are: In the present invention, an occipital plate and a connecting rod are provided, the occipital plate is connected to the occipital bone, the connecting rod is connected to the axis, the occipital plate and the connecting rod are rotatably connected, and the angle between the occipital plate and the connecting rod is adjusted by relative rotation of the occipital plate and the connecting plate, so that the atlantoaxial dislocation is restored to an ideal state, and then the occipital plate and the connecting rod bracket are locked using a locking assembly to lock the rotation between the occipital plate and the connecting rod, the occipital plate and the connecting rod support and fix the occipital bone and the axis in a fixed posture, and when adjusting the angle between the occipital plate and the connecting rod, the locking assembly can be loosened to restore the occipital plate and the connecting rod to a state of relative rotation, thereby realizing the adjustment and fixed state switching of the angle between the occipital plate and the connecting rod, facilitating the operation of medical personnel, and realizing flexible adjustment of the angle between the occipital plate and the connecting rod. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is one of the three-dimensional structural diagrams of an improved posterior reduction and fixation system for skull base depression complicated with atlantoaxial dislocation proposed by the present invention; Figure 2 This is the second three-dimensional structural diagram of the present invention; Figure 3 This is the third three-dimensional structural diagram of the present invention; Figure 4 It is a three-dimensional structural diagram of the gear shaft in the present invention; Figure 5 It is a three-dimensional structural diagram of the connecting rod in the present invention; Figure 6 A top view of the connecting rod of the present invention; Figure 7 for Figure 6 Schematic diagram of the cross-sectional structure at AA in the middle; Figure 8 It is a three-dimensional structural diagram of the first plate body in the present invention; Fig. 9 It is a three-dimensional structural diagram of the second plate body in the present invention.

[0019] Legend: 1. Occipital plate; 11. Connecting plate; 12. Connecting head; 121. First gear ring; 111. First plate body; 112. Second plate body; 113. Adjusting gear; 114. Locking screw; 115. Strip hole; 116. Arc folding edge; 1111. Sliding groove; 1121. Sliding block; 1122. Accommodating groove; 11221. Rack; 2. Connecting rod; 21. Rod body; 22. Connecting seat; 221. First seat body; 222. Connecting seat body; 223. Second seat body; 2211. Mounting hole; 2221. Second gear ring; 22111. Step hole; 2231. Arc opening; 22311. Step groove; 3. Locking assembly; 31. Adjusting screw; 4. Gear shaft; 100. Wrench. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] See also Figure 1-9 The present invention provides a technical solution: an improved posterior reduction and fixation system for skull base depression complicated with atlantoaxial dislocation, comprising an occipital plate 1, a connecting rod 2 and a locking assembly 3, wherein the occipital plate 1 is used to connect with the occipital bone, the connecting rod 2 is used to connect with the axis, and the occipital plate 1 and the connecting rod 2 are rotatably connected; The locking assembly 3 is disposed on the connecting rod 2. When the occipital plate 1 and the connecting rod 2 are adjusted to a preset angle, the locking assembly 3 is used to lock the rotation of the occipital plate 1 and the connecting rod 2.

[0022] It is understandable that the internal fixation system is used to fix the occipital bone and the axis vertebra. The occipital plate 1 can be connected to the occipital bone through occipital screws, and the connecting rod 2 is connected to the axis vertebra through pedicle screws. The inclination angle between the occipital plate 1 and the connecting rod 2 needs to conform to the anatomical structure of the occipital bone and the axis vertebra of the human body.

[0023] The inclination angle between the occipital plate 1 and the connecting rod 2 is α, and the occipital plate 1 and the connecting rod 2 can rotate relative to each other to adjust the size of α, so that the occipital plate 1 can lift and reset the occipital bone, and reset the angle between the occipital bone and the axis vertebra to the ideal physiological curvature, which is more conducive to the treatment of the patient.

[0024] Specifically, the rotation structure of the occipital plate 1 and the connecting rod 2 can be achieved by bearings or by rotating gears.

[0025] After the occipital plate 1 is connected to the occipital bone and the connecting rod 2 is connected to the axis, the angle between the occipital plate 1 and the connecting rod 2 is adjusted to the preset angle. At this time, the angle between the occipital plate 1 and the connecting rod 2 is reset to the ideal angle. The locking assembly 3 is used to fix the relative position between the occipital plate 1 and the connecting rod 2. The occipital plate 1 and the connecting rod 2 form a fixed posture at the current preset angle to assist in the reduction of the patient's atlas and axis.

[0026] Specifically, the locking assembly 3 can be implemented through a key slot and key structure, or through a snap-on structure.

[0027] The posterior reduction and fixation system for basilar depression complicated with atlantoaxial dislocation provided by the present invention has adjustable angle and controllable reduction process. The occipital plate 1 and the connecting rod 2 are provided. The occipital plate 1 is connected to the occipital bone, and the connecting rod 2 is connected to the axis. The occipital plate 1 and the connecting rod 2 are rotatably connected. The angle between the occipital plate 1 and the connecting rod 2 is adjusted by relative rotation of the occipital plate 1 and the connecting plate 11, so that the atlantoaxial dislocation is reduced to an ideal state. Subsequently, the occipital plate 1 and the connecting rod 2 bracket are locked using a locking component 3, so that the rotation between the occipital plate 1 and the connecting rod 2 is locked. The occipital plate 1 and the connecting rod 2 support and fix the occipital bone and the axis in a fixed posture. When adjusting the angle between the occipital plate 1 and the connecting rod 2, the locking component 3 can be loosened to restore the occipital plate 1 and the connecting rod 2 to a state of relative rotation, thereby realizing the adjustment and fixed state switching of the angle between the occipital plate 1 and the connecting rod 2, facilitating the operation of medical personnel, and realizing flexible adjustment of the angle between the occipital plate 1 and the connecting rod 2.

[0028] Specifically, Figure 1 , Figure 2 , Figure 4 and Figure 5 As shown, the reduction and internal fixation system of this embodiment further includes a gear shaft 4.

[0029] The occipital plate 1 comprises a connecting plate 11 and a connecting head 12 . The connecting plate 11 is connected to the occipital bone, and the connecting head 12 is arranged at one end of the connecting plate 11 away from the occipital bone.

[0030] The connecting rod 2 includes a rod body 21 and a connecting seat 22. The rod body 21 is connected to the axis, and the connecting seat 22 is arranged at one end of the rod body 21 away from the axis.

[0031] Both the connector 12 and the connector base 22 have through holes. The inner wall of the through hole of the connector 12 has a first gear ring 121 , and the inner wall of the through hole of the connector base 22 has a second gear ring 2221 . The gear shaft 4 passes through the through hole and meshes with the first gear ring 121 and the second gear ring 2221 , respectively.

[0032] It can be understood that the gear shaft 4 transmits rotational motion and torque by meshing with the first gear ring 121 and the second gear ring 2221. The teeth on the gear shaft 4 mesh with the teeth on the first gear ring 121 and the second gear ring 2221, and can accurately transmit rotational motion. When adjusting the angle between the connecting head 12 and the connecting seat 22, the angle between the connecting head 12 and the connecting seat 22 can be slowly and flexibly adjusted through the cooperation of the gear shaft 4 with the first gear ring 121 and the second gear ring 2221, thereby avoiding damage to the patient and achieving smaller angle adjustments, which is conducive to achieving slight adjustments in the angle between the connecting plate 11 and the rod body 21. Specifically, Figure 1 , Figure 7 and Fig. 9As shown, the connecting head 12 is provided with two first gear rings 121 .

[0033] The two first gear rings 121 are arranged opposite to each other and sandwich the second gear ring 2221 therebetween. The gear shaft 4 passes through the two first gear rings 121 and the second gear ring 2221 .

[0034] It is understandable that the two first gear rings 121 form a clamping space, and the second gear ring 2221 is clamped in the clamping space, so that when the second gear ring 2221 and the first gear ring 121 rotate through the gear shaft 4, the gear shaft 4 can be stably passed through the two second gear rings 2221 and the first gear ring 121, which is beneficial to the reliability of the rotation of the gear shaft 4.

[0035] Specifically, Figure 5 As shown, the connecting seat 22 of this embodiment includes a first seat body 221 , a connecting seat body 222 and a second seat body 223 .

[0036] The first seat body 221 , the connecting seat body 222 and the second seat body 223 are connected in sequence, and the first seat body 221 and the second seat body 223 are arranged opposite to each other. The first seat body 221 is connected to the rod body 21 , and the connecting seat body 222 has a second gear ring 2221 .

[0037] The gear shaft 4 is passed through the connecting seat body 222 , and the locking assembly 3 is arranged on the first seat body 221 and the second seat body 223 . The locking assembly 3 is used to adjust the distance between the first seat body 221 and the second seat body 223 to achieve locking and loosening of the rotation of the connecting seat body 222 and the gear shaft 4 .

[0038] It can be understood that the connecting seat body 222 is used to install the second gear ring 2221, and the first seat body 221 and the second seat body 223 respectively support the locking component 3 from both sides of the connecting seat body 222, so that when the locking component 3 is locked on the connecting seat 22, it can reduce the distance between the first seat body 221 and the second seat body 223, so that the second gear ring 2221 can lock the gear shaft 4, thereby limiting the rotation of the gear shaft 4, and then locking the relative rotation of the connecting seat body 222 and the gear shaft 4, thereby locking the angle between the connecting head 12 and the connecting seat 22, and when it is necessary to release the unlocking component 3, it only needs to increase the distance between the first seat body 221 and the second seat body 223, which can be conveniently achieved, and the operation is simple. Specifically, Figure 1 As shown, the locking assembly 3 of this embodiment includes: an adjusting screw 31 ; a mounting hole 2211 is provided on the first seat body 221 , and an arc-shaped opening 2231 is provided on the second seat body 223 , and the mounting hole 2211 and the arc-shaped opening 2231 are coaxially arranged.

[0039] The adjusting screw 31 is rotatably inserted through the arc-shaped opening 2231 and the mounting hole 2211 to achieve locking or loosening of the relative rotation between the gear shaft 4 and the connecting seat 22 .

[0040] The nut of the adjusting screw 31 is matched with the screwing structure of the wrench 100 , so as to facilitate the operation of the adjusting screw 31 by the wrench 100 .

[0041] It is understandable that the nut of the adjusting screw 31 is provided with a structure adapted to the wrench 100 , and the wrench 100 can be used to screw the adjusting screw 31 during the adjustment process.

[0042] The screw of the adjusting screw 31 can extend into the arc-shaped opening 2231 and the mounting hole 2211. When the angle of the occipital plate 1 and the connecting rod 2 needs to be locked, the adjusting screw 31 is tightened with the wrench 100. The adjusting screw 31 reduces the distance between the first seat body 221 and the second seat body 223, thereby reducing the inner diameter of the second gear ring 2221, so that the second gear ring 2221 is tightly clamped on the gear shaft 4, and the gear shaft 4 cannot rotate relative to the first gear ring 121 and the second gear ring 2221, thereby achieving the locking of the gear shaft 4 and the connecting seat 22, thereby achieving Locking of the occipital plate 1 and the connecting rod 2; when the angle of the occipital plate 1 and the connecting rod 2 needs to be adjusted, use the wrench 100 to loosen the adjusting screw 31, and the adjusting screw 31 increases the distance between the first seat body 221 and the second seat body 223, thereby increasing the inner diameter of the second gear ring 2221, so that the clamping force of the second gear ring 2221 on the gear shaft 4 becomes smaller, and the gear shaft 4 can rotate relative to the first gear ring 121 and the second gear ring 2221, thereby achieving the loosening of the gear shaft 4 and the connecting seat 22, and then achieving the loosening of the occipital plate 1 and the connecting rod 2.

[0043] In this embodiment, by providing an adjustment screw 31, the angle between the occipital plate 1 and the connecting rod 2 can be easily adjusted by screwing the adjustment screw 31 with the wrench 100, which is convenient for medical personnel to operate with the wrench 100 without interfering with the occipital plate 1 and the connecting rod 2.

[0044] Specifically, Figure 6 and Figure 7 As shown, in this embodiment, a step groove 22311 is provided in the arc-shaped opening 2231 , and a step hole 22111 is provided in the mounting hole 2211 .

[0045] When the adjusting screw 31 is in a locked state, the bottom wall of the step groove 22311 abuts against the nut of the adjusting screw 31 to limit the adjusting screw 31 .

[0046] The stepped hole 22111 limits the screw rod of the adjusting screw 31 at the small head end of the stepped hole 22111 .

[0047] It is understandable that when the adjusting screw 31 is rotated and adjusted in the arc-shaped opening 2231 and the mounting hole 2211, the bottom wall of the step groove 22311 can limit the adjusting screw 31 to prevent the adjusting screw 31 from slipping off the connecting seat 22, and the step hole 22111 can ensure that the screw rod of the adjusting screw 31 is always located at the small head end of the step hole 22111, further limiting the rotation path of the adjusting screw 31, so that when the spacing between the first seat body 221 and the second seat body 223 changes, the adjusting screw 31 always rotates from the small head end of the step hole 22111 to the step groove 22311, thereby improving the reliability of the adjusting angle of the adjusting screw 31.

[0048] Specifically, Figure 1 , Figure 8 and Fig. 9 As shown, the connecting plate 11 includes a first plate body 111 and a second plate body 112 .

[0049] The first end of the first plate body 111 is connected to the occipital bone, and the second end of the second plate body 112 is connected to the connector 12 .

[0050] A sliding groove 1111 is disposed at the second end of the first plate body 111 , and a sliding block 1121 is disposed at a first end of the second plate body 112 close to the first plate body 111 . The sliding block 1121 is movably disposed in the sliding groove 1111 to adjust the length of the connecting plate 11 .

[0051] It is understandable that, based on the cooperation between the sliding block 1121 and the sliding groove 1111, the first plate 111 and the second plate 112 can slide relative to each other, and then the relative position of the first plate 111 and the second plate 112 can be adjusted, thereby adjusting the length of the connecting plate 11. Medical staff can adjust the relative position of the first plate 111 and the second plate 112 according to the specific length of the patient's occipital bone, so that the effect of lifting and resetting the occipital bone is better. Since the length of the connecting plate 11 can adapt to the installation of occipitals of different lengths, the universality of the connecting plate 11 is improved, and the difficulty of installing the first plate 111 on the occipital bone is reduced. Specifically, Figure 1 and Fig. 9 As shown, the connecting plate 11 of this embodiment further includes: an adjusting gear 113 and a locking screw 114 .

[0052] The locking screw 114 is threadedly connected to the first plate body 111, and the adjusting gear 113 is sleeved on the locking screw 114. The second plate body 112 has a receiving groove 1122, and the groove wall on one side of the receiving groove 1122 has a rack 11221. The adjusting gear 113 is rotatably disposed in the receiving groove 1122 and meshing with the rack 11221.

[0053] It can be understood that since the adjusting gear 113 is meshed with the rack 11221, by screwing the adjusting gear 113, the adjusting gear 113 moves up and down relative to the rack 11221, thereby driving the first plate 111 to move relative to the second plate 112, so that the patient's atlantoaxial vertebra is repositioned, and screwing the adjusting gear 113 is stopped, and the locking screw 114 is tightened to fix the adjusting gear 113, thereby locking the first plate 111 and the second plate 112, and the length of the connecting plate 11 is fixed.

[0054] In this embodiment, by providing an adjusting gear 113 and a locking screw 114, the relative movement of the first plate 111 and the second plate 112 can be completed based on the meshing of the adjusting gear 113 and the rack 11221, and when the relative position of the first plate 111 and the second plate 112 is appropriate, the locking screw 114 is used to lock the first plate 111 and the second plate 112, which can not only flexibly adjust, but also fix the relative position of the first plate 111 and the second plate 112, which is conducive to the switching between adjustment and fixation. Specifically, Figure 1 As shown, a strip-shaped hole 115 is provided at the first end of the connecting plate 11 .

[0055] The strip-shaped holes 115 are extended along the length direction of the connecting plate 11 .

[0056] A plurality of strip-shaped holes 115 are provided, and the plurality of strip-shaped holes 115 are arranged at intervals along the length direction of the connecting plate 11 .

[0057] It can be understood that the strip hole 115 is used to install the occipital screw, so as to realize the connection between the occipital bone and the connecting plate 11. The installation position of the occipital screw in the strip hole 115 can be fine-tuned along the length direction of the strip hole 115, thereby facilitating medical staff to select a suitable implantation position. In addition, the first end of the connecting plate 11 of this embodiment is provided with two strip holes 115, and the occipital screws can be implanted in the two strip holes 115 at the same time, so that the connection between the connecting plate 11 and the occipital bone is more reliable.

[0058] Specifically, Figure 1 As shown, in this embodiment, the area corresponding to two adjacent strip holes 115 on the connecting plate 11 is provided with an arc-shaped folded edge 116.

[0059] There are two arc-shaped folded edges 116 , which are respectively disposed on two sides of the connecting plate 11 .

[0060] It is understandable that since the bending curvature of the occipital bone is different, during the operation, medical staff need to bend the connecting plate 11 according to the specific situation so that the connecting plate 11 can better fit the physiological angle of the occipital bone. The setting of the arc-shaped folded edge 116 reduces the strength of the area that needs to be bent, which is more conducive to the operation of medical staff.

[0061] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. An improved posterior reduction and fixation system for skull base depression complicated with atlantoaxial dislocation, characterized in that: It comprises an occipital plate (1), a connecting rod (2) and a locking assembly (3), wherein the occipital plate (1) is used to be connected to the occipital bone, the connecting rod (2) is used to be connected to the axis vertebra, and the occipital plate (1) and the connecting rod (2) are rotatably connected; The locking component (3) is arranged on the connecting rod (2), and when the occipital plate (1) and the connecting rod (2) are adjusted to a preset angle, the locking component (3) is used to lock the rotation of the occipital plate (1) and the connecting rod (2).

2. The improved posterior reduction and fixation system for skull base depression complicated with atlantoaxial dislocation according to claim 1, characterized in that: Also includes a gear shaft (4); The occipital plate (1) comprises a connecting plate (11) and a connecting head (12), wherein the connecting plate (11) is connected to the occipital bone, and the connecting head (12) is arranged at an end of the connecting plate (11) away from the occipital bone; The connecting rod (2) comprises a rod body (21) and a connecting seat (22), the rod body (21) being connected to the axis, and the connecting seat (22) being arranged at an end of the rod body (21) away from the axis; The connecting head (12) and the connecting seat (22) both have a through hole, the inner wall of the through hole of the connecting head (12) has a first gear ring (121), the inner wall of the through hole of the connecting seat (22) has a second gear ring (2221), and the gear shaft (4) is arranged through the through hole and is respectively meshed with the first gear ring (121) and the second gear ring (2221).

3. The improved posterior reduction and fixation system for skull base depression complicated with atlantoaxial dislocation according to claim 2, characterized in that: The connecting head (12) is provided with two first gear rings (121); The two first gear rings (121) are arranged opposite to each other, and the second gear ring (2221) is sandwiched between them. The gear shaft (4) is disposed through the two first gear rings (121) and the second gear ring (2221).

4. The improved posterior reduction and fixation system for skull base depression complicated with atlantoaxial dislocation according to claim 3, characterized in that: The connecting seat (22) comprises a first seat body (221), a connecting seat body (222) and a second seat body (223); The first seat body (221), the connecting seat body (222) and the second seat body (223) are connected in sequence, and the first seat body (221) and the second seat body (223) are arranged opposite to each other. The first seat body (221) is connected to the rod body (21), and the connecting seat body (222) has a second gear ring (2221).

5. The improved posterior reduction and fixation system for skull base indentation complicated with atlantoaxial dislocation according to claim 4, characterized in that: The locking assembly (3) comprises: an adjusting screw (31); The first seat body (221) is provided with a mounting hole (2211), the second seat body (223) is provided with an arc-shaped opening (2231), and the mounting hole (2211) and the arc-shaped opening (2231) are coaxially arranged; The adjusting screw (31) is rotatably inserted through the arc-shaped opening (2231) and the mounting hole (2211) to achieve locking or loosening of the relative rotation between the gear shaft (4) and the connecting seat (22); The nut of the adjusting screw (31) is matched with the screwing structure of the wrench (100), so as to facilitate the operation of the adjusting screw (31) by the wrench (100).

6. The improved posterior reduction and fixation system for skull base depression complicated with atlantoaxial dislocation according to claim 5, characterized in that: A step groove (22311) is provided in the arc-shaped opening (2231), and a step hole (22111) is provided in the mounting hole (2211); When the adjusting screw (31) is in a locked state, the bottom wall of the step groove (22311) abuts against the nut of the adjusting screw (31) to limit the position of the adjusting screw (31); The step hole (22111) limits the screw rod of the adjusting screw (31) to the small head end of the step hole (22111).

7. The improved posterior reduction and fixation system for skull base indentation complicated with atlantoaxial dislocation according to claim 2, characterized in that: The connecting plate (11) comprises a first plate body (111) and a second plate body (112); The first end of the first plate body (111) is connected to the occipital bone, and the second end of the second plate body (112) is connected to the connecting head (12); A sliding groove (1111) is provided at the second end of the first plate body (111), and a sliding block (1121) is provided at a side of the first end of the second plate body (112) close to the first plate body (111), wherein the sliding block (1121) is movably arranged in the sliding groove (1111) to adjust the length of the connecting plate (11).

8. The improved posterior reduction and fixation system for skull base depression complicated with atlantoaxial dislocation according to claim 7, characterized in that: The connecting plate (11) further comprises: an adjusting gear (113) and a locking screw (114); The locking screw (114) is threadedly connected to the first plate body (111); the adjusting gear (113) is sleeved on the locking screw (114); the second plate body (112) has a receiving groove (1122); a groove wall on one side of the receiving groove (1122) has a rack (11221); the adjusting gear (113) is rotatably arranged in the receiving groove (1122) and meshed with the rack (11221).

9. The improved posterior reduction and fixation system for skull base depression complicated with atlantoaxial dislocation according to claim 2, characterized in that: The first end of the connecting plate (11) is provided with a strip-shaped hole (115); The strip-shaped holes (115) are arranged to extend along the length direction of the connecting plate (11); A plurality of the strip-shaped holes (115) are provided, and the plurality of the strip-shaped holes (115) are arranged at intervals along the length direction of the connecting plate (11).

10. The improved posterior reduction and fixation system for skull base indentation complicated with atlantoaxial dislocation according to claim 9, characterized in that: Areas corresponding to two adjacent strip-shaped holes (115) on the connecting plate (11) are provided with arc-shaped folded edges (116); Two arc-shaped folded edges (116) are provided, and the two arc-shaped folded edges (116) are respectively arranged on two sides of the connecting plate (11).

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