Connecting device and occipitocervical posterior internal fixation system

Abstract

The present invention relates to a connecting device and a posterior occipito-cervical internal fixation system. The connecting device includes a connecting seat, a connecting member, and a locking member. The connecting seat is provided with two receiving holes, and the center lines of the two receiving holes are arranged at an included angle. The connecting member is rotatably inserted into the receiving hole. One end of the locking member is inserted into the receiving hole, and the locking member is used to lock or loosen the connecting member. The above-mentioned connecting device avoids bending of the connecting member, ensures the strength and use effect of the connecting member, and the angle adjustment of the connecting member is simpler and more labor-saving, which is convenient for intraoperative operation.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and particularly to a connecting device and a posterior occipitocervical internal fixation system. Background Art

[0002] With the popularization of computer work and the increase in heavy mobile phone users, the number of patients with cervical spondylosis is also increasing day by day. Cervical spondylosis seriously affects the daily life, work and quality of life of patients. Surgical operation is one of the current effective treatment methods. In cervical spine surgery, it is usually necessary to restore the normal sequence, curvature, height and mobility of the cervical spine through a posterior occipitocervical internal fixation system, so as to maintain the stability of the cervical spine and improve the nerve function compressed by bone.

[0003] Traditional posterior occipitocervical internal fixation systems include screw seats, connecting rods, compression nuts, etc. The compression nut is used to fix the connecting rod on the screw seat. The compression nut not only needs to limit the axial movement of the connecting rod but also needs to press the connecting rod in the long U-shaped groove of the screw seat. In order to firmly lock the head end of the connecting rod in the long U-shaped groove as much as possible, the connecting rod usually needs to be bent at a large angle clinically, which will damage the strength and service effect of the connecting rod, and it is also difficult to implant the connecting rod during the operation due to the physiological curvature of the occipital bone and the cervical spine. Summary of the Invention

[0004] Based on this, it is necessary to provide a connecting device and a posterior occipitocervical internal fixation system that are simple to implant and avoid damaging the strength and service effect of the connecting rod.

[0005] A connecting device, comprising:

[0006] A connecting seat, the connecting seat is provided with two receiving holes, and the central lines of the two receiving holes are arranged at an included angle;

[0007] A connecting member, the connecting member is rotatably inserted into the receiving hole; and,

[0008] A locking member, one end of the locking member is inserted into the receiving hole, and the locking member is used to lock or loosen the connecting member.

[0009] In one embodiment, the connecting member includes a spherical rotating portion and a connecting portion connected to the rotating portion, the rotating portion is rotatably disposed in the receiving hole, and the connecting portion extends out of the receiving hole.

[0010] In one embodiment, the connecting seat is further provided with a first spherical groove and a connecting hole. The first spherical groove communicates with the receiving hole, and the first spherical groove matches the outer contour of the rotating part and is in rotational cooperation with the rotating part. The connecting hole communicates with the first spherical groove and penetrates through the connecting seat, and the connecting part is in clearance fit with the connecting hole.

[0011] In one embodiment, a chamfer is provided at one end of the hole wall of the connecting hole away from the first spherical groove.

[0012] In one embodiment, the connecting device further includes a pressing member. The pressing member is movably arranged in the receiving hole. The pressing member cooperates with the locking member and is used for selectively locking or loosening the connecting member under the drive of the locking member.

[0013] In one embodiment, the connecting device further includes a pressing member. The pressing member is arranged between the connecting member and the locking member. A second spherical groove is provided on one side of the pressing member close to the rotating part. The second spherical groove matches the outer contour of the rotating part. The locking member is used for selectively driving the pressing member to move close to the rotating part or releasing the pressing member, so that the pressing member locks or loosens the connecting member.

[0014] In one embodiment, an anti-slip portion for cooperating with the second spherical groove is provided on the surface of the rotating part; and / or,

[0015] An anti-slip portion for cooperating with the surface of the rotating part is provided on the surface of the second spherical groove.

[0016] In one embodiment, at least a part of the locking member has a conical structure. A conical surface matching the conical structure is provided on one side of the pressing member close to the locking member, and the conical surface is used for contacting the conical structure.

[0017] In one embodiment, the locking member includes a threaded portion and a guiding portion. The connecting seat is further provided with a threaded hole and a guiding hole communicating with the receiving hole, and the center lines of the threaded hole and the guiding hole coincide. The threaded portion is inserted into the threaded hole, and the guiding portion is inserted into the guiding hole.

[0018] In one embodiment, the connecting seat is an integrally formed structure, and the two receiving holes communicate with each other and penetrate through the connecting seat; or, the connecting seat includes a detachable first part and a second part, each of the first part and the second part is provided with a receiving hole, and the connecting member, the pressing member and the locking member are arranged in each receiving hole.

[0019] In one embodiment, the connecting seat is provided with a side groove communicating with the receiving hole and a limiting member for locking or releasing the side groove.

[0020] A posterior occipitocervical internal fixation system includes an occipital plate, pedicle screws, and the above-mentioned connecting device.

[0021] By rotatably arranging a connecting member in the receiving hole of the connecting seat and locking or releasing the connecting member through a locking member, the above-mentioned connecting device and the posterior occipitocervical internal fixation system can unlock the connecting member through the locking member during a clinical operation, and then rotate the connecting member around a direction perpendicular to the center line of the receiving hole, so as to adjust the included angle between the two connecting members within a certain range, so that the included angle between the two connecting members adapts to the included angle requirements between the occipital bone and the cervical vertebrae of different patients. After adjusting the two connecting members to an angle adapted to the included angle between the occipital bone and the cervical vertebrae, the connecting member is locked through the locking member, thereby preventing the connecting member from rotating relative to the connecting seat, and further enabling the connecting device to adapt to the included angle requirements between the occipital bone and the cervical vertebrae of different patients. Compared with the traditional connecting rod that bends at a large angle to adapt to the included angle requirement between the occipital bone and the cervical vertebrae, the connecting device of the present application avoids bending of the connecting member, ensures the strength and use effect of the connecting member, and the angle adjustment of the connecting member is simpler and more labor-saving, facilitating intraoperative operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The schematic embodiments and descriptions thereof of the present invention are used to explain the present invention and do not constitute an improper limitation of the present invention.

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0024] Figure 1 It is a structural cross-sectional view of the connecting device according to an embodiment;

[0025] Figure 2 For Figure 1 It is a structural cross-sectional view of the connecting member of the connecting device shown in

[0026] Figure 3 For Figure 1 It is a structural cross-sectional view of the connecting seat of the connecting device shown in

[0027] Figure 4 For Figure 1 It is a structural cross-sectional view of the pressing member of the connecting device shown in

[0028] Figure 5 is Figure 1 a structural sectional view of the locking member of the connecting device shown in

[0029] Description of reference numerals:

[0030] 10. Connecting seat; 11. Accommodating hole; 111. Through hole; 12. First spherical groove; 13. Connecting hole; 131. Chamfer; 141. Threaded hole; 142. Guide hole; 20. Connecting member; 21. Connecting portion; 22. Rotating portion; 23. Anti-slip portion; 30. Pressing member; 31. Second spherical groove; 32. Conical surface; 40. Locking member; 41. Guide portion; 42. Threaded portion; 43. Conical structure; 44. Driving interface. Detailed implementation manners

[0031] In order to make the above objects, features and advantages of the present invention more obvious and understandable, the following will describe the detailed implementation manners of the present invention with reference to the accompanying drawings. Many specific details are set forth in the following description in order to fully understand the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the connotation of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed below.

[0032] Refer to Figure 1 , Figure 1 shows a sectional view of the connecting device in an embodiment of the present invention. Specifically, an embodiment of the present application provides a connecting device for replacing the connecting rod in the traditional posterior atlantoaxial internal fixation system to restore the normal sequence, curvature, height and mobility of the cervical vertebrae. Specifically, a connecting device in an embodiment includes a connecting seat 10, a connecting member 20, a pressing member 30 and a locking member 40. The connecting seat 10 is provided with two accommodating holes 11, and the central lines of the two accommodating holes 11 are arranged at an angle. The connecting member 20 is rotatably inserted into the accommodating hole 11; the pressing member 30 is movably arranged in the accommodating hole 11. One end of the locking member 40 is inserted into the accommodating hole 11 and the locking member 40 cooperates with the pressing member 30, and the locking member 40 is used to drive the pressing member 30 to lock or loosen the connecting member 20.

[0033] Preferably, the two accommodating holes 11 extend substantially along the extending direction of the connecting seat 10 and are arranged symmetrically with respect to a symmetry plane S. The angle between the central lines of the two accommodating holes 11 matches the angle between the occipital bone and the cervical vertebrae. Generally, the angle between the occipital bone and the cervical vertebrae is about 100° - 120°. Therefore, in this embodiment, the range of the angle between the central lines of the two accommodating holes 11 is 100° - 120°. Further, the connecting member 20, the pressing member 30 and the locking member 40 all correspond to the accommodating hole 11 one by one, that is, each accommodating hole 11 is correspondingly provided with a connecting member 20, a pressing member 30 and a locking member 40.

[0034] Preferably, the connecting seat 10 is also mirror-symmetrical with respect to the symmetry plane S, and the included angle between the centerlines of the two mirror-symmetrical parts also matches the included angle between the occipital bone and the cervical vertebra. Preferably, this included angle is the same as the included angle between the centerlines of the two receiving holes 11.

[0035] Furthermore, the connecting member 20 is used to connect the pedicle screw or screw seat in the posterior occipito-cervical internal fixation system. In the initial state, the extending direction of the connecting member 20 is consistent with the extending direction of the centerline of the receiving hole 11, so that the included angle between the two connecting members 20 meets the general included angle requirement between the occipital bone and the cervical vertebra. When the included angle between the two connecting members 20 does not meet the required included angle requirement between the occipital bone and the cervical vertebra, the pressing member 30 unlocks the connecting member 20 through the locking member 40, and then by rotating the connecting member 20 around the direction perpendicular to the centerline of the receiving hole 11, the included angle between the two connecting members 20 can be changed within a certain range, so that the connecting device adapts to the included angle requirements between the occipital bone and the cervical vertebra of different patients.

[0036] The above-mentioned connecting device rotatably arranges the connecting member 20 in the receiving hole 11 of the connecting seat 10, and through the cooperation of the locking member 40 and the pressing member 30, the connecting member 20 is locked or loosened. Thus, during a clinical operation, the locking member 40 can be used to drive the pressing member 30 to unlock the connecting member 20, and then by rotating the connecting member 20 around the axis perpendicular to the centerline of the receiving hole 11, the included angle between the two connecting members 20 can be adjusted within a certain range, so that the included angle between the two connecting members 20 adapts to the included angle requirements between the occipital bone and the cervical vertebra of different patients. After adjusting the two connecting members 20 to an angle adapted to the included angle between the occipital bone and the cervical vertebra, the locking member 40 is used to drive the pressing member 30 to lock the connecting member 20, thereby preventing the connecting member 20 from rotating relative to the connecting seat 10, and further enabling the connecting device to adapt to the included angle requirements between the occipital bone and the cervical vertebra of different patients. Compared with the traditional connecting rod that adapts to the included angle requirement between the occipital bone and the cervical vertebra by large-angle bending, the connecting device of the present application avoids bending of the connecting member 20, ensures the strength and use effect of the connecting member 20, and the angle adjustment of the connecting member 20 is simpler and more labor-saving, facilitating intraoperative operation.

[0037] Furthermore, referring to Figure 2-3, the connecting member 20 includes a spherical rotating portion 22 and a rod-shaped connecting portion 21. The connecting portion 21 is connected to the rotating portion 22. The rotating portion 22 is rotatably disposed in the receiving hole 11, and the connecting portion 21 extends out of the receiving hole 11. Further, the connecting seat 10 is further provided with a first spherical surface groove 12 and a connecting hole 13. The first spherical surface groove 12 communicates with the receiving hole 11, and the first spherical surface groove 12 matches the outer contour of the rotating portion 22. The first spherical surface groove 12 is in rotational cooperation with the rotating portion 22. By the cooperation of the first spherical surface groove 12 and the spherical rotating portion 22, a spherical connection pair can be formed between the connecting member 20 and the connecting seat 10, so that the connecting member 20 can freely rotate around the center of the sphere of the rotating portion 22 to change its own angle. Further, the connecting hole 13 communicates with the first spherical surface groove 12 and penetrates through the connecting seat 10. The connecting portion 21 is in clearance fit with the connecting hole 13, thereby ensuring that the connecting member 20 can rotate freely. Further, the connecting hole 13 is a cylindrical hole. Since the rotation range of the connecting member 20 is related to the clearance between it and the hole wall of the connecting hole 13, the larger the diameter of the connecting hole 13, the larger the rotation range of the connecting member 20. However, if the diameter of the connecting hole 13 is too large, it is easy for the rotating portion 22 of the connecting member 20 to come out of the receiving hole 11. Therefore, the diameter of the connecting hole 13 is larger than the diameter of the connecting portion 21 but smaller than the diameter of the rotating portion 22.

[0038] Further, referring to Figure 3 , a chamfer 131 is provided on the hole wall at the end of the connecting hole 13 away from the first spherical surface groove 12. The chamfer 131 is used to limit the rotation range of the connecting member 20. Specifically, by providing a chamfer 131 on the hole wall at the end of the connecting hole 13 away from the first spherical surface groove 12, while expanding the rotation range of the connecting member 20, the diameter of the connecting hole 13 can be effectively prevented from being too large, thereby avoiding the rotating portion 22 of the connecting member 20 from coming out of the receiving hole 11. Preferably, in this embodiment, the included angle between the center lines of the two receiving holes 11 is 110°, and the range of the chamfer 131 is between C0.5 - C1.5, so that the included angle between the two connecting members 20 can be adjusted between 100° - 120°.

[0039] Further, referring to Figure 1 and Figure 4, The pressing member 30 is disposed between the connecting member 20 and the locking member 40. A second spherical surface groove 31 is provided on one side of the pressing member 30 close to the rotating portion 22. The second spherical surface groove 31 matches the outer contour of the rotating portion 22. The locking member 40 is used to drive the pressing member 30 to move closer to or away from the rotating portion 22, so as to lock or loosen the connecting member 20 by the pressing member 30. Through the cooperation of the second spherical surface groove 31 with a spherical cross-section and the spherical rotating portion 22, after the locking member 40 drives the pressing member 30 to move closer to the rotating portion 22, the groove wall of the second spherical surface groove 31 abuts against and presses the rotating portion 22. The rotation of the rotating portion 22 is restricted by the frictional force between the groove wall of the second spherical surface groove 31 and the rotating portion 22, thereby locking the connecting member 20. When the locking member 40 releases the pressing member 30, the rotating portion 22 is no longer subjected to the frictional force of the groove wall of the second spherical surface groove 31, so that the connecting member 20 can rotate freely.

[0040] Further, referring to Figure 2 , An anti-slip portion 23 for cooperating with the second spherical surface groove 31 is provided on the surface of the rotating portion 22. The anti-slip portion 23 is used to increase the frictional force between the rotating portion 22 and the pressing member 30, ensuring that the rotating portion 22 cannot rotate arbitrarily when the groove wall of the second spherical surface groove 31 abuts against the rotating portion 22. Preferably, the anti-slip portion 23 is a plurality of grooves or protrusions provided on the rotating portion 22. In another embodiment, the anti-slip portion 23 may also be an anti-slip material provided on the surface of the rotating portion 22. For example, the anti-slip material may be EVA, rubber or silica gel, etc. Further, the groove wall of the second spherical surface groove 31 may also be provided with the anti-slip portion 23, thereby further increasing the frictional force between the rotating portion 22 and the pressing member 30.

[0041] Further, referring to Figure 4 and Figure 5 , At least a part of the locking member 40 has a conical structure 43. A conical surface 32 matching the conical structure 43 is provided on one side of the pressing member 30 close to the locking member 40. The conical surface 32 is in contact with the conical structure 43. Specifically, the conical surface 32 includes a large end and a small end. By driving the locking member 40 to insert into the receiving hole 11 along a direction perpendicular to the center line of the receiving hole 11 and moving from the large end of the conical surface 32 to the small end of the conical surface 32, since the conical structure of the locking member 40 matches the conical surface 32 and the conical structure 43 is in contact with the conical surface 32, the pressing member 30 will be forced to move in the direction close to the rotating portion 22 during the movement of the locking member 40, and finally the pressing member 30 locks the rotating portion 22. On the contrary, by driving the locking member 40 to move from the small end of the conical surface 32 to the large end of the conical surface 32, the locking member 40 can release the pressing member 30, and further the pressing member 30 releases the rotating portion 22. Preferably, the inclination angles of the conical structure 43 and the conical surface 32 are 30°-50°. Within this range, the conical structure 43 and the pressing member 30 will not form self-locking due to the static frictional force between the materials and can achieve a better locking effect.

[0042] Further, see Figure 3 as well as Figure 5 The locking member 40 includes a threaded portion 42 and a guide portion 41. The connection seat 10 is further provided with a threaded hole 141 and a guide hole 142 that penetrate the receiving hole 11, and the center line of the threaded hole 141 coincides with the center line of the guide hole 142. The threaded portion 42 is inserted into the threaded hole 141, so that the locking member 20 can be locked or released by rotating the locking member 40 in different directions. The guide portion 41 is inserted into the guide hole 142. Preferably, the guide portion 41 is a cylinder, and the guide hole 142 is a cylindrical hole. The guide portion 41 cooperates with the guide hole 142 to position and guide the movement of the locking member 40, so that the locking member 40 can only move along the center line direction of the guide hole 142, avoiding the problem that the locking member 40 is offset by the reaction force of the pressing member 30 during the locking process of the pressing member 30, and ensuring that the locking member 40 drives the pressing member 30 to move close to the rotating portion 22 during the locking process. Furthermore, the conical structure 43 is disposed at the lower half of the threaded portion 42, and the upper half of the threaded portion 42 is a cylindrical structure.

[0043] Further, see Figure 5 One end of the locking member 40 is also provided with a driving interface 44 for cooperating with the driving device. The driving interface 44 can be in the shape of a straight line, a cross, a square, a hexagon or a plum blossom, etc., and is not limited here. The driving interface 44 can be used to quickly and labor-savingly tighten or loosen the locking member 40 by cooperating with the driving device, thereby reducing the difficulty of implanting the connecting device during surgery.

[0044] In this embodiment, the locking member 40 is inserted into the receiving hole 11 in a direction perpendicular to the center line of the receiving hole 11. In other embodiments, the locking member 40 can also be inserted into the receiving hole 11 at any angle to the center line of the receiving hole 11, such as obliquely inserted into the receiving hole 11, or inserted into the receiving hole 11 in parallel. When inserting in parallel, it is not necessary to open the threaded hole 141 and the guide hole 142 on the connecting seat 10, and it can be directly inserted along the receiving hole 11. When inserting in parallel, the pressing member 30 can be omitted, and the end of the locking member 40 can be directly used to press against the rotating part 22 to lock the angle between the two connecting members 20.

[0045] Further, see Figure 1 In this embodiment, the connecting seat 10 is an integrally formed structure, and the two receiving holes 11 are connected and pass through the connecting seat 10. Specifically, the receiving hole 11 includes a through opening 111 passing through the connecting seat 10. The connecting piece 20 and the pressing piece 30 can be placed in the receiving hole 11 through the through opening 111, which facilitates the installation of the connecting device.

[0046] Of course, in other embodiments, the connecting seat 10 can also be made into a split type, that is, the connecting seat 10 includes a detachable first part and a second part. Each of the first part and the second part is provided with a through accommodating hole 11. A connecting piece 20, a pressing piece 30 and a locking piece 40 are arranged in each accommodating hole 11. Thus, before installation, the connecting piece 20, the pressing piece 30 and the locking piece 40 are installed in each accommodating hole 11, and then the first part and the second part are combined, which can also realize the convenient installation of the connecting device.

[0047] In addition, in other embodiments, the connecting seat 10 is provided with a side groove communicating with the accommodating hole 11 and a limiting piece for locking or loosening the side groove. Thus, the connecting piece 20 and the pressing piece 30 can be put into the accommodating hole 11 through the side groove, and then the side groove is locked by the limiting piece, so as to prevent the connecting piece 20 and the pressing piece 30 from coming out of the side groove. In this way, the convenient installation of the connecting device can also be realized.

[0048] Further, in one of the embodiments, the present application also provides a posterior occipitocervical internal fixation system. The posterior occipitocervical internal fixation system includes an occipital plate, pedicle screws and the connecting device of any of the above embodiments. The connecting piece 20 of the connecting device is connected to the pedicle screws in the posterior occipitocervical internal fixation system, so as to restore the normal sequence, curvature, height and mobility of the cervical vertebrae.

[0049] In the above posterior occipitocervical internal fixation system, the connecting piece 20 is rotatably arranged in the accommodating hole 11 of the connecting seat 10, and the locking piece 40 and the pressing piece 30 are matched, so that the connecting piece 20 is locked or loosened. Thus, during clinical surgery, the locking piece 40 can be used to drive the pressing piece 30 to unlock the connecting piece 20, and then by rotating the connecting piece 20 around an axis perpendicular to the central line of the accommodating hole 11, the included angle between the two connecting pieces 20 can be adjusted within a certain range, so that the included angle between the two connecting pieces 20 adapts to the included angle requirements between the occipital bone and the cervical vertebrae of different patients. After adjusting the two connecting pieces 20 to an angle adapted to the included angle between the occipital bone and the cervical vertebrae, the locking piece 40 is used to drive the pressing piece 30 to lock the connecting piece 20, so as to prevent the connecting piece 20 from rotating relative to the connecting seat 10, and further make the connecting device adapt to the included angle requirements between the occipital bone and the cervical vertebrae of different patients. Compared with the traditional connecting rod that adapts to the included angle requirement between the occipital plate and the cervical vertebrae by large-angle bending, the connecting device of the present application avoids bending of the connecting piece 20, ensures the strength and use effect of the connecting piece 20, and the angle adjustment of the connecting piece 20 is simpler and more labor-saving, which is convenient for intraoperative operation.

[0050] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope recorded in this specification.

[0051] The above-described embodiments merely represent several implementation manners of the present invention. The description thereof is relatively specific and detailed, but it should not be construed as a limitation on the scope of the invention patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can still be made, and these all fall within the protection scope of the present invention. Therefore, the protection scope of the present invention patent shall be subject to the appended claims.

[0052] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation on the present invention.

[0053] In addition, the terms "first" and "second" are only used for descriptive purposes, and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0054] In the present invention, unless otherwise clearly defined and limited, the terms "mounted", "connected", "connected to", "fixed", etc. should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements or the interaction relationship between two elements, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0055] In the present invention, unless otherwise clearly defined and limited, a first feature being "on" or "under" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact via an intermediate medium. Moreover, a first feature being "above", "over" and "on top of" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature has a higher level than the second feature. A first feature being "under", "below" and "beneath" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature has a lower level than the second feature.

[0056] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may also be an intermediate element. When an element is considered to be "connected" to another element, it may be directly connected to the other element or there may be an intermediate element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only embodiments.

Claims

1. A connecting device for replacing the connecting rod in the occipitocervical posterior internal fixation system, characterized in that, The connecting device includes: a connecting base, the connecting base is provided with two receiving holes, the two receiving holes are respectively opened at opposite ends of the connecting base, and the central lines of the two receiving holes are arranged at an angle; two connecting members, the two connecting members are respectively inserted into the two receiving holes in a one-to-one correspondence; the two connecting members can rotate relative to the connecting base to adjust the angle between the two connecting members, and two locking members, the two locking members are respectively inserted into the receiving holes, and the locking members are used to lock or loosen the corresponding connecting members; wherein, the connecting member includes a spherical rotating portion and a connecting portion connected to the rotating portion, the rotating portion is rotatably arranged in the receiving hole, and the connecting portion extends out of the receiving hole; the connecting device further includes a pressing member, the pressing member is movably arranged in the receiving hole, the pressing member cooperates with the locking member, and the pressing member is used to selectively lock or loosen the connecting member under the drive of the locking member.

2. The connecting device according to claim 1, characterized in that, The connecting base is further provided with a first spherical groove and a connecting hole, the first spherical groove is communicated with the receiving hole, and the first spherical groove matches the outer contour of the rotating portion, and the first spherical groove is in rotational cooperation with the rotating portion, the connecting hole communicates with the first spherical groove and penetrates through the connecting base, and the connecting portion is in clearance fit with the connecting hole.

3. The connecting device according to claim 2, characterized in that, One end of the hole wall of the connecting hole away from the first spherical groove is provided with a chamfer.

4. The connecting device according to claim 1, characterized in that, The pressing member is arranged between the connecting member and the locking member, a second spherical groove is provided on one side of the pressing member close to the rotating portion, the second spherical groove matches the outer contour of the rotating portion, and the locking member is used to selectively drive the pressing member to move close to the rotating portion or release the pressing member, so that the pressing member locks or loosens the connecting member.

5. The connecting device according to claim 4, characterized in that, The surface of the rotating portion is provided with an anti-slip portion for cooperating with the second spherical groove; and / or, The surface of the second spherical groove is provided with an anti-slip portion for cooperating with the surface of the rotating portion.

6. The connecting device according to claim 4 or 5, characterized in that, At least a part of the locking member has a conical structure, a conical surface matching the conical structure is provided on one side of the pressing member close to the locking member, and the conical surface is used to contact the conical structure.

7. The connecting device according to claim 6, characterized in that, The locking member includes a threaded portion and a guiding portion, the connecting base is further provided with a threaded hole and a guiding hole communicating with the receiving hole, and the central line of the threaded hole coincides with the central line of the guiding hole, the threaded portion is inserted into the threaded hole, and the guiding portion is inserted into the guiding hole.

8. The connecting device according to claim 4 or 5, characterized in that The connecting base is an integrally formed structure, and the two receiving holes communicate with each other and penetrate through the connecting base; or, the connecting base includes a detachable first part and a second part, each of the first part and the second part is provided with one of the receiving holes, and the connecting member, the pressing member and the locking member are arranged in each receiving hole.

9. The connecting device according to claim 4 or 5, characterized in that The connecting base is provided with a side groove communicating with the receiving hole and a limiting member for locking or loosening the side groove.

10. A posterior occipitocervical internal fixation system, characterized in that, It includes an occipital bone plate, pedicle screws and the connecting device according to any one of claims 1-9 above.

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