Occipital plate system

Abstract

The present invention provides an occipital plate system, which includes an occipital plate, a connecting rod assembly, and a ball head seat. The connecting rod assembly includes a first connecting rod, and one end of the first connecting rod has a ball head. The ball head seat has a notch and a receiving cavity arranged along the axial direction of the ball head seat. The notch is opened along the radial direction of the ball head seat and communicates with the receiving cavity. The receiving cavity and the notch are open at one end facing the axial direction of the ball head seat. The radial inner dimension of the receiving cavity is adapted to the outer diameter of the ball head, and the ball head is detachably arranged in the receiving cavity. The width of the notch is not less than the radial outer dimension of the corresponding part of the first connecting rod. The ball head seat is detachably arranged on the occipital plate and can rotate around the axis of the receiving cavity. The first connecting rod is configured to adjust the angle of the first connecting rod relative to the occipital plate by rotating the ball head in the receiving cavity and by rotating the ball head seat around the axis of the receiving cavity. In this way, the notch of the occipital plate system can be reduced, the foreign body sensation of the patient after surgery can be reduced, and the implantation is convenient, improving the surgical efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and particularly relates to an occipital plate system. Background Art

[0002] Please refer to Figure 1 , which shows a common occipital plate system on the current market. It includes an occipital plate 01, a titanium rod 02, and several connecting members 03. The connecting member 03 includes a compression nut and a screw seat. The titanium rod 02 is fixed on the screw seat by using the compression nut, thereby fixing the position of the titanium rod 02 relative to the occipital plate 01. This fixing method has relatively high requirements for the matching performance of the compression nut and the screw seat. The compression nut not only needs to fix the axial movement of the titanium rod 02 but also needs to press the titanium rod 02 into the groove of the screw seat. In order to place the head end of the titanium rod 02 in the groove as firmly as possible and to adapt to the physiological curvature of the occipital bone, usually in clinical situations, this titanium rod 02 is bent at a large angle, which will damage the strength and usage effect of the titanium rod 02. Moreover, due to the physiological curvatures of the occipital bone and the cervical vertebrae, the placement during the operation is relatively difficult, and it may be necessary to try to bend the titanium rod 02 multiple times during the operation. At the same time, in order to prevent the axial movement of the titanium rod 02 or the possibility of the titanium rod 02 withdrawing from the connecting member 03 of the occipital plate 01, generally, the head end of the titanium rod 02 ( Figure 1 the upper end in needs to protrude a certain distance from the occipital plate 01. In this case, the notch (the notch can be understood as the size of the implant) of the entire occipital plate system will be relatively high, and the foreign body sensation of the patient after the operation will be relatively strong. Summary of the Invention

[0003] The purpose of the present invention is to provide an occipital plate system to solve the problems of a relatively high notch and inconvenient implantation of the occipital plate system in the prior art.

[0004] To solve the above technical problems, the present invention provides an occipital plate system, which includes: an occipital plate, a connecting rod assembly, and a ball head seat;

[0005] The connecting rod assembly includes a first connecting rod, and one end of the first connecting rod has a ball head;

[0006] The ball head seat has a notch and a receiving cavity arranged along the axial direction of the ball head seat. The notch is radially opened on the ball head seat and communicates with the receiving cavity; the receiving cavity and the notch are open at one end facing the axial direction of the ball head seat;

[0007] The radial inner dimension of the receiving cavity is adapted to the outer diameter of the ball head. The ball head is used for detachably arranging in the receiving cavity, and the width of the notch is not less than the radial outer dimension of the corresponding part of the first connecting rod;

[0008] The ball head seat is used to be detachably arranged on the occipital bone plate and is rotatable around the axis of the accommodating cavity; the first connecting rod is configured to rotate in the accommodating cavity through the ball head and rotate around the axis of the accommodating cavity through the ball head seat to adjust the angle of the first connecting rod relative to the occipital bone plate.

[0009] Optionally, the occipital bone plate system includes a compression screw; the compression screw has an external thread, and the external thread is a negative angle thread; the accommodating cavity has an internal thread adapted to the external thread, and the negative angle thread direction of the internal thread faces away from the open end of the accommodating cavity. The compression screw is detachably threadedly connected to the ball head seat for locking the ball head.

[0010] Optionally, the ball head is in point contact or line contact with the compression screw; and / or, the ball head is in point contact or line contact with the end of the accommodating cavity away from the open end.

[0011] Optionally, the compression screw includes a compression end face and a first recess. The compression end face is used to face the ball head, and the first recess is opened on the compression end face. The compression screw is in point contact or line contact with the ball head through the edge of the first recess on the compression end face; and / or

[0012] The ball head seat includes a limiting surface and a second recess. The limiting surface is located at one end of the accommodating cavity along the axis away from the open end, and the second recess is opened on the limiting surface. The accommodating cavity is in point contact or line contact with the ball head through the edge of the second recess on the limiting surface.

[0013] Optionally, the compression screw includes a first through hole penetrating along the axis, and the first through hole is configured as the first recess. When the compression screw is matched with the ball head, the axis of the first through hole passes through the center of the ball of the ball head; and / or

[0014] The ball head seat includes a second through hole penetrating along the axis, and the second through hole is configured as the second recess. When the compression screw is matched with the ball head, the axis of the second through hole passes through the center of the ball of the ball head.

[0015] Optionally, the occipital bone plate includes a through oblong hole; the ball head seat is used to be detachably arranged in the oblong hole. The short axis dimension of the oblong hole is adapted to the radial outer dimension of the corresponding part of the ball head seat, and the position of the ball head seat along the long axis direction of the oblong hole is adjustable.

[0016] Optionally, the ball head seat includes a bottom plate, a clamping groove and an accommodating seat connected in sequence. The accommodating cavity and the notch are arranged on the accommodating seat;

[0017] The minimum radial outer dimension of the bottom plate is greater than the minor axis dimension of the waist-shaped hole;

[0018] The engaging groove is annularly formed along the circumferential direction of the ball head seat. The outer diameter of the engaging groove is adapted to the minor axis dimension of the waist-shaped hole, and the axial width of the engaging groove is adapted to the thickness of the occipital bone plate;

[0019] The minimum radial outer dimension of the accommodating seat is not greater than the minor axis dimension of the waist-shaped hole, and the maximum radial outer dimension of the accommodating seat is greater than the minor axis dimension of the waist-shaped hole.

[0020] Optionally, the occipital bone plate system further includes a snap ring. The snap ring has a radial opening. The inner diameter of the snap ring is adapted to the outer diameter of the engaging groove, and the radial outer dimension of the snap ring is greater than the minor axis dimension of the waist-shaped hole; the snap ring is used for detachably engaging with the engaging groove to limit the axial degree of freedom of the ball head seat relative to the occipital bone plate.

[0021] Optionally, the connecting rod assembly further includes a first connecting block, a second connecting block, and a second connecting rod; the first connecting block is detachably connected to the first connecting rod; the second connecting block is detachably connected to the first connecting block; the second connecting rod is detachably connected to the second connecting block;

[0022] One end face of the first connecting block has a first tooth surface;

[0023] One end face of the second connecting block has a second tooth surface adapted to the first tooth surface; when the first connecting block and the second connecting block are configured to be axially engaged and connected through the first tooth surface and the second tooth surface, the relative circumferential degree of freedom is restricted.

[0024] Optionally, the first connecting block includes a connecting rod groove that radially penetrates the first connecting block. The radial inner dimension of the connecting rod groove is adapted to the radial outer dimension of the first connecting rod, and the first connecting rod is detachably inserted into the connecting rod groove.

[0025] Optionally, the occipital bone plate system further includes a first set screw. The first connecting block is radially provided with a first set screw hole that communicates with the connecting rod groove. The first set screw hole has a thread adapted to the first set screw, and the first set screw is detachably arranged in the first set screw hole for locking the first connecting rod.

[0026] Optionally, the connecting rod groove opens towards an end face of the first connecting block in the axial direction. The connecting rod groove includes a first region and a second region along the extending direction of the first fastening hole. The length of the first region along the extending direction of the first fastening hole is the same as the width of the opening of the connecting rod groove on the end face of the first connecting block. The second region is adjacent to the side of the first region away from the first fastening hole.

[0027] Optionally, the occipital plate system further includes a second fastening screw; one of the first connecting block and the second connecting block includes an angular locking handle, and the other includes an angular locking hole and a second fastening hole. The angular locking handle is used for detachably inserting into the angular locking hole; the second fastening hole communicates with the angular locking hole along the radial direction of the angular locking hole; the second fastening hole has a thread adapted to the second fastening screw, and the second fastening screw is used for detachably arranging in the second fastening hole through the thread to at least limit the axial freedom degree of the angular locking handle along the direction towards the tooth surface of the connecting block where it is located.

[0028] Optionally, the angular locking handle includes an inclined surface that inclines inwards towards the tooth surface of the connecting block where it is located. When the first tooth surface and the second tooth surface are configured to be meshed and connected axially, the minimum distance of the inclined surface relative to the tooth surface of the connecting block where it is located is greater than the distance of the axis of the second fastening hole relative to the tooth surface of the connecting block where it is located.

[0029] Optionally, one end of the second fastening screw towards the angular locking handle includes a tapered surface that inclines inwards towards the angular locking handle. The tapered surface abuts against the inclined surface to limit the axial freedom degree of the angular locking handle along the direction towards the tooth surface of the connecting block where it is located.

[0030] Optionally, the second connecting block has a mounting hole opened along the radial direction, and the second connecting rod is used for detachably arranging in the mounting hole through the thread.

[0031] Optionally, at least two shaping grooves and / or tool holes are formed on the occipital plate.

[0032] In summary, the occipital plate system provided by the present invention includes an occipital plate, a connecting rod assembly, and a ball head seat. The connecting rod assembly includes a first connecting rod, and one end of the first connecting rod has a ball head. The ball head seat has a notch and a receiving cavity axially arranged along the ball head seat. The notch is radially opened along the ball head seat and communicates with the receiving cavity. The receiving cavity and the notch are open at one end facing the axis of the ball head seat. The radial inner dimension of the receiving cavity is adapted to the outer diameter of the ball head. The ball head is used for detachably arranging in the receiving cavity. The width of the notch is not less than the radial outer dimension of the corresponding part of the first connecting rod. The ball head seat is used for detachably arranging on the occipital plate and can rotate around the axis of the receiving cavity. The first connecting rod is configured to adjust the angle of the first connecting rod relative to the occipital plate by rotating the ball head in the receiving cavity and by rotating the ball head seat around the axis of the receiving cavity.

[0033] With such a configuration, since the ball head of the first connecting rod is received in the receiving cavity of the ball head seat and there is no axial movement, the first connecting rod does not need to protrude from the ball head seat, reducing the notch of the occipital plate system and the foreign body sensation of the patient after surgery. Through the connection between the ball head of the first connecting rod and the ball head seat, the angle of the first connecting rod relative to the occipital plate can be conveniently adjusted. It is not necessary to bend the first connecting rod to adjust to a suitable angle. On the one hand, the strength and use effect of the first connecting rod will not be damaged. On the other hand, during the implantation process, only simple assembly of each component is required without bending the first connecting rod, making the implantation process more convenient and improving the surgical efficiency of the operator. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Those of ordinary skill in the art will understand that the provided drawings are used to better understand the present invention and do not constitute any limitation to the scope of the present invention. Among them:

[0035] Figure 1 is a schematic diagram of an occipital plate system;

[0036] Figure 2 is an exploded schematic diagram of the occipital plate system according to an embodiment of the present invention;

[0037] Figure 3 is a schematic diagram of a compression screw according to an embodiment of the present invention;

[0038] Figures 4a to 4c is a schematic diagram of different preferred examples of the first connecting rod according to an embodiment of the present invention;

[0039] Figure 5 is a schematic diagram of a snap ring according to an embodiment of the present invention;

[0040] Figure 6 is a schematic diagram of a ball head seat according to an embodiment of the present invention;

[0041] Figure 7 is a schematic diagram of the occipital bone plate according to an embodiment of the present invention;

[0042] Figure 8 is a schematic diagram of the first connecting block according to an embodiment of the present invention;

[0043] Figure 9 is a schematic diagram of the second connecting block according to an embodiment of the present invention;

[0044] Figure 10 is a schematic cross-sectional view of the mating connection between the first connecting block and the second connecting block according to an embodiment of the present invention;

[0045] Figure 11 is a schematic cross-sectional view of the mating connection between the pressing screw and the ball head seat according to an embodiment of the present invention;

[0046] Figure 12 is a schematic cross-sectional view of the pressing screw according to an embodiment of the present invention.

[0047] In the drawings:

[0048] 01 - occipital bone plate; 02 - titanium rod; 03 - connecting piece;

[0049] 10 - occipital bone plate; 11 - waist-shaped hole; 12 - shaping groove; 13 - tool hole;

[0050] 20 - connecting rod assembly; 21 - first connecting rod; 211 - ball head; 212 - connecting section; 22 - first connecting block; 221 - first tooth surface; 222 - connecting rod groove; 222a - first area; 222b - second area; 223 - first set screw hole; 23 - second connecting block; 231 - second tooth surface; 232 - mounting hole; 233 - third set screw hole; 24 - second connecting rod; 25 - angle locking handle; 251 - inclined surface; 261 - angle locking hole; 262 - second set screw hole;

[0051] 30 - ball head seat; 31 - accommodating cavity; 32 - notch; 33 - limiting surface; 34 - second depression; 35 - bottom plate; 36 - engaging groove; 37 - accommodating seat;

[0052] 40 - pressing screw; 41 - pressing end face; 42 - first depression; 43 - tool connection hole; 44 - first through hole;

[0053] 50 - snap ring; 51 - first set screw; 52 - second set screw; 521 - conical surface; 53 - third set screw. Detailed implementation manners

[0054] To make the objectives, advantages, and features of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that the accompanying drawings are in very simplified forms and are not drawn to scale, and are only used to conveniently and clearly assist in explaining the objectives of the embodiments of the present invention. In addition, the structures shown in the accompanying drawings are often part of the actual structures. In particular, the accompanying drawings need to show different emphases and sometimes use different scales.

[0055] As used in this specification, the singular forms "a", "an", and "the" include plural referents unless the context clearly dictates otherwise. As used in this specification, the term "or" is generally used in the sense of including "and / or" unless the context clearly dictates otherwise. The term "proximal" generally refers to the end closer to the operator, and the term "distal" generally refers to the end closer to the lesion of the patient.

[0056] The core idea of the present invention is to provide an occipital plate system to solve the problem of the relatively high notch of the occipital plate system in the prior art and the inconvenience of implantation.

[0057] The following description refers to the accompanying drawings.

[0058] Please refer to Figures 2 to 12 , wherein Figure 1 is a schematic diagram of an occipital plate system; Figure 2 is an exploded schematic diagram of the occipital plate system according to an embodiment of the present invention; Figure 3 is a schematic diagram of a compression screw according to an embodiment of the present invention; Figures 4a to 4c is a schematic diagram of different preferred examples of a first connecting rod according to an embodiment of the present invention; Figure 5 is a schematic diagram of a snap ring according to an embodiment of the present invention; Figure 6 is a schematic diagram of a ball head seat according to an embodiment of the present invention; Figure 7 is a schematic diagram of an occipital plate according to an embodiment of the present invention; Figure 8 is a schematic diagram of a first connecting block according to an embodiment of the present invention; Figure 9 is a schematic diagram of a second connecting block according to an embodiment of the present invention; Figure 10 is a sectional schematic diagram of the cooperation connection between the first connecting block and the second connecting block according to an embodiment of the present invention; Figure 11 is a sectional schematic diagram of the cooperation connection between the compression screw and the ball head seat according to an embodiment of the present invention; Figure 12 is a sectional schematic diagram of a compression screw according to an embodiment of the present invention.

[0059] As Figure 2As shown in the figure, an embodiment of the present invention provides an occipital plate system, which includes: an occipital plate 10, a connecting rod assembly 20, and a ball head seat 30; the connecting rod assembly 20 includes a first connecting rod 21, one end of the first connecting rod 21 has a ball head 211, and the ball head 211 refers to a structure with a diameter larger than that of the connecting rod 21 and a spherical or approximately spherical shape; the ball head seat 30 has a receiving cavity 31 and a notch 32 arranged along the axial direction of the ball head seat 30, the notch 32 is opened along the radial direction of the ball head seat 30 and communicates with the receiving cavity 31; the receiving cavity 31 and the notch 32 are open at one end facing the axial direction of the ball head seat 30, where the axial and radial directions of the ball head seat 30 refer to the axial and radial directions of the cylinder when the ball head seat 30 is regarded as a cylinder; the radial inner dimension of the receiving cavity 31 is adapted to the outer diameter of the ball head 211, the ball head 211 is used to be detachably arranged in the receiving cavity 31, and the width of the notch 32 is not less than the radial outer dimension of the corresponding part of the first connecting rod 21 (that is, the part of the first connecting rod 21 passing through the notch 32), where the radial inner dimension refers to the radial width of the receiving cavity 31, that is, the bottom diameter of the cylinder when the receiving cavity 31 is regarded as a cylinder, and the radial outer dimension refers to the radial width of the corresponding part of the first connecting rod 21, that is, the bottom diameter of the cylinder when the corresponding part of the first connecting rod 21 is regarded as a cylinder, and the following radial inner dimension and radial outer dimension are also defined in a similar way; the ball head seat 30 is used to be detachably arranged on the occipital plate 10 and can rotate around the axis of the receiving cavity 31; the first connecting rod 21 is configured to rotate the ball head 211 in the receiving cavity 31 and rotate around the axis of the receiving cavity 31 through the ball head seat 30 to adjust the angle of the first connecting rod 21 relative to the occipital plate.

[0060] Please refer to Figures 4a to 4c and Figure 6 , Figures 4a to 4c respectively show three preferred examples of the first connecting rod 21, and the first connecting rod 21 further includes a connecting section 212 connected to the ball head 211. Figure 6Exemplarily, a ball socket 30 is shown. The accommodating cavity 31 and the notch 32 are both open towards one end of the axis of the ball socket 30. The ball head 211 of the first connecting rod 21 can be inserted into the accommodating cavity 31 along the open end. Further, since the width of the notch 32 is not less than the radial outer dimension of the corresponding part of the first connecting rod (i.e., the connecting section 212), the connecting section 212 can pass through the notch 32 without being hindered. The plane where the midline of the notch 32 and the axis of the accommodating cavity 31 are located is a revolving surface. The first connecting rod 21 can freely rotate around the center of the ball head 211 along the revolving surface, thereby adjusting the angle between the first connecting rod 21 and the occipital plate 10. The first connecting rod 21 with the ball head 211 is easier to place the rod during use (i.e., put the first connecting rod 21 into the accommodating cavity 31). And due to the limitation of the accommodating cavity 31, the first connecting rod 21 can be prevented from axially moving after the operation. Moreover, the ball head 211 is received into the accommodating cavity 31 and does not protrude from the ball socket 30, so that the notch at the connection node between the first connecting rod 21 and the ball socket 30 can be reduced, and further the foreign body sensation of the patient after the operation can be reduced. Figure 4a The ball head 211 is an ordinary sphere. Correspondingly, the accommodating cavity 31 can be cylindrical, and the inner diameter of the accommodating cavity 31 is adapted to the diameter of the ball head 211. Figure 4b The ball head 211 is cut on both sides of the sphere in the direction parallel to the revolving surface to form two opposite planes. Correspondingly, the accommodating cavity 31 is a columnar body roughly in a waist shape (i.e., correspondingly forming two planes in the direction parallel to the revolving surface). Figure 4b After the ball head 211 is assembled into the corresponding accommodating cavity 31, it can be further restricted by the planes in the direction parallel to the revolving surface, and only has the rotational freedom in the direction of the revolving surface. Figure 4c The ball head 211 is provided with a protruding section on the side of the sphere away from the connecting section 212. Correspondingly, the ball socket 30 preferably has two notches 32 arranged oppositely, and the protruding section and the connecting section 212 are respectively inserted into one notch 32. Figure 4c After the ball head 211 is assembled into the corresponding accommodating cavity 31, the protruding section and the connecting section 212 jointly limit that the first connecting rod 21 only has the rotational freedom in the direction of the revolving surface. And by rotating the ball socket 30 around the axis of the accommodating cavity 31, the rotational freedom of the first connecting rod 21 around the axis of the accommodating cavity 31 in the circumferential direction can be realized. At the same time, it can be understood that the revolving surface also rotates circumferentially around the axis of the accommodating cavity 31. Combining the rotation of the first connecting rod 21 around the center of the ball head 211 on the revolving surface, the universal adjustable rotation of the first connecting rod 21 relative to the occipital plate 10 is realized.

[0061] Preferably, please refer to Figure 3 and Figure 11, the occipital plate system includes a compression screw 40; the compression screw 40 has an external thread, and the external thread is a negative angle thread; the accommodating cavity 31 has an internal thread adapted to the external thread, and the negative angle thread direction of the internal thread faces away from the open end of the accommodating cavity 31. The compression screw 40 is detachably threadedly connected to the ball head seat 30 for locking the ball head 211. A negative angle thread means that both hypotenuses of the thread teeth incline in the same direction. In other words, if the cross-section of the thread tooth is a triangle, the triangle includes an obtuse angle, while in the cross-section of a general thread, this angle is a right angle or an acute angle. The negative angle thread has a good anti-loosening effect, thereby enhancing the locking force of the compression screw 40. Please refer to Figure 11 , which is a schematic diagram after the compression screw 40 is connected to the ball head seat 30. Among them, the accommodating cavity 31 opens towards the Figure 11 upper end direction, and the negative angle thread direction of the internal thread of the accommodating cavity 31 faces away from the open end of the accommodating cavity 31 (i.e., downward), that is, the obtuse angle of the cross-section triangle of the thread teeth of the accommodating cavity 31 is located on the lower side of the cross-section triangle of each thread tooth. With such a configuration, the negative angle thread direction of the external thread of the adapted compression screw 40 faces upward. After the compression screw 40 is screwed into the accommodating cavity 31, it has a good anti-loosening effect.

[0062] Furthermore, from the axial section of the compression screw 40 (such as Figure 11 ), the ball head 211 is in point contact or line contact with the compression screw 40; and / or, the ball head 211 is in point contact or line contact with the end of the accommodating cavity 31 away from the open end. The point contact or line contact method reliably defines the position of the center of the ball of the ball head 211 and reduces the risk of breakage of the first connecting rod 21.

[0063] Please refer to Figure 12 , in an exemplary embodiment, the compression screw 40 includes a compression end face 41 and a first recess 42. The compression end face 41 is arranged to face the ball head 211, and the first recess 42 is formed on the compression end face 41. The compression screw 40 is in point contact or line contact with the ball head 211 through the edge of the first recess 42 on the compression end face 41. In terms of space, when the edge of the first recess 42 on the compression end face 41 is a circle centered on the axis of the accommodating cavity 31, the compression screw 40 is in line contact with the ball head 211, and the contact surface is a circle. When the edge of the first recess 42 on the compression end face 41 is not a circle, it can be understood that at this time the compression screw 40 is in multiple point contacts with the ball head 211.

[0064] Optionally, the pressing screw 40 further includes a tool connection hole 43 for an external tool to be inserted therein to rotate the pressing screw 40. In some examples, the tool connection hole 43 can be, for example, a cross recess, a flat slot, an internal hexagonal hole, an internal plum blossom hole or an internal triangular hole, etc., preferably a connection hole corresponding to a conventional tool (such as a cross screwdriver, an internal hexagonal wrench or an internal plum blossom wrench, etc.). The tool connection hole 43 is preferably an internal plum blossom hole, which has a high torque bearing capacity and is not easily deformed.

[0065] Further, please continue to refer to Figure 11 , in a preferred example, the pressing screw 40 includes a first through hole 44 penetrating axially, and the first through hole 44 is configured as the first recess 42. When the pressing screw 40 cooperates with the ball head 211, the axis of the first through hole 44 passes through the center of the ball of the ball head 211. In Figure 11 the illustrated example, both ends of the penetrating first through hole 44 are respectively configured as the tool connection hole 43 and the first recess 42, and this way facilitates the production and processing of the pressing screw 40. In particular, when the first through hole 44 is an internal plum blossom hole, it can be understood that the pressing screw 40 is in point contact connection with the ball head 211.

[0066] Preferably, the ball head seat 30 includes a limiting surface 33 and a second recess 34. The limiting surface 33 is located at one end of the accommodating cavity 31 along the axis away from the open end, and the second recess 34 is formed on the limiting surface 33. From the axial section of the ball head seat 30, the accommodating cavity 31 is in point contact or line contact with the ball head 211 through the edge of the second recess 34 on the limiting surface 33. Similar to the pressing screw 40, from a spatial perspective, when the edge of the second recess 43 on the limiting surface 33 is a circle centered on the axis of the accommodating cavity 31, the pressing screw 40 is in line contact with the ball head 211, and the contact surface is a circle. When the edge of the second recess 43 on the limiting surface 33 is not a circle, it can be understood that at this time the accommodating cavity 31 is in multiple point contact with the ball head 211. In one example, the ball head seat 30 includes a second through hole penetrating axially, and the second through hole is configured as the second recess 34. When the pressing screw 40 cooperates with the ball head 211, the axis of the second through hole passes through the center of the ball of the ball head 211. The method of forming the second recess 34 by using the second through hole facilitates the production and processing of the ball head seat 30.

[0067] Please refer to Figure 7 , and in combination with Figure 2, Preferably, the occipital plate 10 includes a through oblong hole 11, and the long axis direction of the oblong hole 11 is arranged at an angle to the projection of the first connecting rod 21 on the occipital plate 10; the ball head seat 30 is used for detachably arranging in the oblong hole 11, and the short axis dimension of the oblong hole 11 is adapted to the radial outer dimension of the corresponding part of the ball head seat 30 (that is, the part where the ball head seat 30 penetrates through the oblong hole 11, referring to the engaging groove 36 in one embodiment), and the position of the ball head seat 30 along the long axis direction of the oblong hole 11 is adjustably arranged. The ball head seat 30 can move along the long axis direction in the oblong hole 11 to adjust the position of the first connecting rod 21 on the occipital plate 10. In some cases, only using the universal rotation of the first connecting rod 21 during the operation may not meet the requirements. At this time, the translation of the first connecting rod 21 can be realized by using the movement of the ball head seat 30 along the long axis direction in the oblong hole 11.

[0068] In a preferred embodiment, the occipital plate system includes two connecting rod assemblies 20 and two ball head seats 30. The occipital plate 10 includes two relatively arranged oblong holes 11, and the long axis connection lines of the two oblong holes 11 coincide. Each oblong hole 11 is respectively provided with a ball head seat 30. With such a configuration, the lateral spacing dimension between the two ball head seats 30 is adjustable. Correspondingly, the lateral spacing dimension of the two first connecting rods 21 in the two connecting rod assemblies 20 is adjustable to meet the requirements of different patients.

[0069] Please refer to Figure 11 , in combination with Figure 6 and Figure 7, Preferably, the ball head seat 30 includes a bottom plate 35, a clamping groove 36 and a receiving seat 37 which are connected in sequence. The receiving cavity 31 and the notch 32 are arranged on the receiving seat 37; the minimum radial outer dimension of the bottom plate 35 is greater than the short axis dimension of the kidney-shaped hole 11; the clamping groove 36 is annularly formed along the circumferential direction of the ball head seat 30, and the outer diameter of the clamping groove 36 is adapted to the short axis dimension of the kidney-shaped hole 11, and the axial width of the clamping groove 36 is adapted to the thickness of the occipital bone plate 11. The minimum radial outer dimension of the receiving seat 37 is not greater than the short axis dimension of the kidney-shaped hole 11, and the maximum radial outer dimension of the receiving seat 37 is greater than the short axis dimension of the kidney-shaped hole 11. Specifically, in some embodiments, the receiving seat 37 is a cylinder, but due to its material and the existence of the notch 32, it can be compressed and rebound. In the compressed state, its minimum radial outer dimension is not greater than the short axis dimension of the kidney-shaped hole 11, and in the rebounding state, its maximum radial outer dimension is greater than the short axis dimension of the kidney-shaped hole 11. In other embodiments, the receiving seat 37 is frustum-shaped or other shapes with variable outer diameters. The minimum radial outer dimension near the open end is not greater than the short axis dimension of the kidney-shaped hole 11, and the maximum radial outer dimension away from the open end is greater than the short axis dimension of the kidney-shaped hole 11. The minimum radial outer dimension of the receiving seat 37 not being greater than the short axis dimension of the kidney-shaped hole 11 can ensure that the ball head seat 30 can be inserted into the kidney-shaped hole 11 with one end of the receiving seat 37; the maximum radial outer dimension of the receiving seat 37 being greater than the short axis dimension of the kidney-shaped hole 11 can ensure that the ball head seat 30 will not fall out of the kidney-shaped hole 11. The minimum radial outer dimension of the bottom plate 35 being greater than the short axis dimension of the kidney-shaped hole 11 can ensure that after the ball head seat 30 is inserted into the kidney-shaped hole 11 with one end of the receiving seat 37, the ball head seat 30 will not continue to move forward and fall out of the kidney-shaped hole 11; the axial width of the clamping groove 36 being adapted to the thickness of the occipital bone plate 10 can ensure that the ball head seat 30 can rotate around the axis of the receiving cavity 31. Through the above configuration, the ball head seat 30 can be conveniently inserted into the kidney-shaped hole 11.

[0070] Further, please refer to Figure 5 , the occipital bone plate system further includes a snap ring 50. The snap ring 50 has a radial opening. The inner diameter of the snap ring 50 is adapted to the outer diameter of the clamping groove 36, and the radial outer dimension of the snap ring 50 is greater than the short axis dimension of the kidney-shaped hole 11; the snap ring 50 is used for detachably clamping in the clamping groove 36 to limit the axial degree of freedom of the ball head seat 30 relative to the occipital bone plate 10. After the ball head seat 30 is inserted into the kidney-shaped hole 11, the axial degree of freedom of the ball head seat 30 can be further restricted by clamping the snap ring 50 on the clamping groove 36, avoiding the ball head seat 30 from falling out of the kidney-shaped hole 11, or when the width of the clamping groove 36 is greater than the thickness of the occipital bone plate 10, clamping the ball head seat 30 tightly on the occipital bone plate 11 so that it cannot shake. Figure 5Shows the shape of a snap ring, which is provided with a small notch relative to the position of the radial opening to further increase the elasticity of the snap ring 50. The snap ring 50 is preferably made of an elastic material and can recover after deformation.

[0071] Please refer to Figures 8 to 10 , preferably, the connecting rod assembly 20 further includes a first connecting block 22, a second connecting block 23 and a second connecting rod 24; the first connecting block 22 is detachably connected to the first connecting rod 21; the second connecting block 23 is detachably connected to the first connecting block 22; the second connecting rod 24 is detachably connected to the second connecting block 23; one end face of the first connecting block 22 has a first tooth surface 221; one end face of the second connecting block 23 has a second tooth surface 231 adapted to the first tooth surface 221; when the first connecting block 22 and the second connecting block 23 are configured to be axially engaged and connected through the first tooth surface 221 and the second tooth surface 231, the relative circumferential degrees of freedom are restricted. Since there is a certain physiological curvature at the occipital bone, the connecting rod assembly 20 needs to have a certain degree of curvature. In the prior art, the curvature is often achieved by bending a titanium rod. In this embodiment, the connecting rod assembly 20 can adjust the relative angle between the second connecting rod 24 and the first connecting rod 21 through the meshing connection between the first connecting block 22 and the second connecting block 23. Compared with the method of bending the titanium rod, the adjustment process is more convenient and accurate, the relative angle between the adjusted second connecting rod 24 and the first connecting rod 21 is maintained more stably, and the strength of the connecting rod will not be reduced due to bending.

[0072] Please refer to Figure 8 , and in combination with Figure 2 , optionally, the first connecting block 22 includes a connecting rod groove 222 that radially penetrates the first connecting block 22, and the radial inner dimension of the connecting rod groove 222 is adapted to the radial outer dimension of the first connecting rod 21, and the first connecting rod 21 is detachably inserted into the connecting rod groove 222. The radially penetrating connecting rod groove 222 facilitates the connection and installation of the first connecting rod 21 and the first connecting block 22. In practice, after the first connecting rod 21 and the occipital bone plate 10 are connected through the ball head seat 30, the end of the first connecting rod 21 without a ball head is not convenient for operations such as rotation. However, through the radially penetrating connecting rod groove 222, the first connecting block 22 can be easily sleeved on the first connecting rod 21 to achieve assembly connection.

[0073] Please refer to Figure 8 and Figure 10Furthermore, the occipital plate system also includes a first fastening screw 51, and the first connecting block 22 is radially provided with a first fastening hole 223, the first fastening hole 223 and the connecting rod groove 222 are connected, and the first fastening hole 223 has a thread adapted to the first fastening screw 51, and the first fastening screw 51 is detachably arranged in the first fastening hole 223 by the thread, for locking the first connecting rod 21; wherein, the connecting rod groove 222 is open toward an axial end face of the first connecting block 22, and the connecting rod groove 222 includes a first area 222a and a second area 222b along the extension direction of the first fastening hole 223, the length of the first area 222a along the extension direction of the first fastening hole 223 is the same as the width of the open mouth of the connecting rod groove 222 on the end face of the first connecting block 22, and the second area 222b is adjacent to the side of the first area 222a away from the first fastening hole 223. Preferably, the threads of the first set screw 51 and the first set hole 223 are negative-angle threads. It will be appreciated that the negative-angle internal threads of the first set hole 223 face inward, i.e., toward the center of the first connecting block 22, while the corresponding negative-angle external threads of the first set screw 51 face outward. Optionally, the end of the first set screw 51 away from the first connecting rod 21 is provided with a tool connection hole, such as a hexagonal, triangular, or torx socket.

[0074] To further simplify the assembly and connection between the first connecting block 22 and the first connecting rod 21, the connecting rod groove 222 is open toward one axial end of the first connecting block 22. This allows the first connecting rod 21 to enter the first section 222a of the connecting rod groove 222 from the open end of the first connecting block 22. The first set screw 51 is then screwed into the first set hole 223 to lock the first connecting rod 21. Furthermore, the provision of the second section 222b prevents the first connecting rod 21 from being dislodged from the open end of the connecting rod groove 222 after being inserted into it. Specifically, the first section 222a is the open area of the connecting rod groove 222 at the axial end of the first connecting block 22, while the second section 222b is a recessed area adjacent to the first section 222a and away from the first set hole 223. In some embodiments, the side of the region away from the first fixing hole 223 is adapted to the outer contour of the first connecting rod 21. For example, if the first connecting rod 21 is a round rod, the side of the second region 222b away from the first fixing hole 223 is also arc-shaped to better limit the position of the first connecting rod 21. It should be understood that the adaptation of the side of the second region 222b away from the first fixing hole 223 to the outer contour of the first connecting rod 21 is not limited to being identical in shape. For example, if the first connecting rod 21 is a round rod and the side of the second region 222b away from the first fixing hole 223 is polygonal, it can also be considered that the two shapes are adapted.

[0075] Preferably, the occipital plate system further includes a second set screw 52; one of the first connecting block 22 and the second connecting block 23 includes an angle locking handle 25, and the other includes an angle locking hole 261 and a second set hole 262. The angle locking handle 25 is used for detachably inserting into the angle locking hole 261; the second set hole 262 communicates with the angle locking hole 261 along the radial direction of the angle locking hole 261; the second set hole 262 has a thread adapted to the second set screw 52, and the second set screw 52 is used for detachably arranging in the second set hole 262 through the thread to at least limit the axial freedom degree of the angle locking handle 25 along the direction towards the tooth surface of the connecting block where it is located. Please refer to Figures 8 to 10 , in one embodiment, the first connecting block 22 includes an angle locking handle 25, the second connecting block 23 includes an angle locking hole 261 and a second set hole 262. After the angle locking handle 25 is inserted into the angle locking hole 261, by screwing the second set screw 52 into the second set hole 262, the axial freedom degree of the angle locking handle 25 along the direction towards the first tooth surface 221 of the first connecting block 22 ( Figure 10 to the right direction in the figure) can be locked. Thus, the freedom degree of the first connecting block 22 moving to the right relative to the second connecting block 23 (i.e., the freedom degree of the first connecting block 22 separating from the second connecting block 23) is locked, thereby locking the first connecting block 22 and the second connecting block 23, so that the first tooth surface 221 and the second tooth surface 231 are meshed and connected axially, and the relative circumferential freedom degree of the first connecting block 22 and the second connecting block 23 is restricted. Of course, in other embodiments, it may also be that the second connecting block 23 includes an angle locking handle 25, and the first connecting block 22 includes an angle locking hole 261 and a second set hole 262, which can also achieve the effect of locking the angle locking handle 25 through the second set screw 52, thereby locking the first connecting block 22 and the second connecting block 23. Preferably, the thread of the second set screw 52 and the second set hole 262 is a negative angle thread. It can be understood that the thread direction of the negative angle internal thread of the second set hole 262 is inward, that is, towards the center direction of the connecting block where it is located, and the thread direction of the negative angle external thread of the second set screw 52 adapted thereto is outward. Optionally, a tool connection hole, such as an internal hexagonal, internal triangular or internal plum blossom hole type, is provided at one end of the second set screw 52 away from the angle locking handle 25.

[0076] Further, the angle locking handle 25 includes an inclined surface 251 that inclines inwards towards the tooth surface of the connecting block where it is located. When the first tooth surface 221 and the second tooth surface 231 are configured to be meshed and connected axially, the minimum distance between the inclined surface 251 and the tooth surface of the connecting block where it is located is greater than the distance between the axis of the second set hole 262 and the tooth surface of the connecting block where it is located. In Figure 10In the illustrated example, the angular locking handle 25 is located on the first connecting block 22, and the inclined surface 251 inclines inwards towards the corresponding first tooth surface 221, that is, the inclined surface 251 inclines inwards towards Figure 10 the right side in Figure 10 . Inclining inwards means inclining towards the axis direction of the angular locking handle 25. In Figure 10 Figure 10 , it means inclining towards the middle from the right. The minimum distance between the inclined surface 251 and the tooth surface of the connecting block where it is located, that is, the axial distance between the point on the inclined surface 251 closest to the axis of the angular locking handle 25 and the first tooth surface 221, and the distance between the axis of the second set screw hole 262 and the tooth surface of the connecting block where it is located, that is, the distance between the axis of the second set screw hole 262 and the second tooth surface 231. Through the above configuration, it can be ensured that after the second set screw 52 is screwed into the second set screw hole 262, the angular locking handle 25 can be locked by abutting against the inclined surface 251 to restrict the axial freedom in the direction towards the first tooth surface 221. Similarly, in other embodiments, the angular locking handle 25 is located on the second connecting block 23, the angular locking hole 261 and the second set screw hole 262 are located on the first connecting block 22, then the corresponding inclined surface 251 inclines inwards towards the second tooth surface 231, and the inclined surface 251 and the second set screw hole 262 are also configured accordingly. Those skilled in the art can make adaptations according to the above description, and will not be repeated here.

[0077] Furthermore, one end of the second set screw 52 facing the angular locking handle 25 includes a tapered surface 521 that inclines inwards towards the angular locking handle 25, and the tapered surface 521 abuts against the inclined surface 251 to restrict the axial freedom of the angular locking handle 25 in the direction towards the tooth surface of the connecting block where it is located. It can be understood that the setting of the tapered surface 521 can increase the contact surface between the second set screw 52 and the inclined surface 251, thereby improving the reliability of the second set screw 52 in locking the angular locking handle 25.

[0078] Please refer to Figure 2 and Figure 9 . Optionally, the second connecting block 23 has a mounting hole 232 opened radially, and the second connecting rod 24 is used to be detachably arranged in the mounting hole 232 by means of threads. After components such as the first connecting block 22 and the second connecting block 23 are assembled and connected, the second connecting rod 24 can be conveniently installed in the mounting hole 232 of the second connecting block 23 by screwing it in by threads. Preferably, the threads of the mounting hole 232 and the second connecting rod 24 are negative angle threads. It can be understood that the thread orientation of the negative angle internal thread of the mounting hole 232 here is inwards, that is, towards the center of the second connecting block 23, and the thread orientation of the negative angle external thread of the corresponding second connecting rod 24 is outwards.

[0079] Preferably, the occipital plate system further includes a third set screw 53. The second connecting block 23 has a third set hole 233 formed radially therein. The third set hole 233 is arranged at an angle to the mounting hole 232, preferably at an angle of 90°. The third set hole 233 communicates with the mounting hole 232. The third set hole 233 has a thread adapted to the third set screw 53. The third set screw 53 is detachably arranged in the third set hole 233 by means of the thread to lock the second connecting rod 24. After the third set screw 53 is screwed into the third set hole 233, the second connecting rod 24 can be prevented from loosening, further improving the reliability of the connection. Similarly, the thread of the third set screw 53 and the third set hole 233 is preferably a negative angle thread. Optionally, one end of the third set screw 53 away from the second connecting rod 24 is provided with a tool connection hole, such as an internal hexagonal, internal triangular or internal plum blossom hole type.

[0080] As Figure 7 shown, optionally, at least two shaping grooves 12 and / or tool holes 13 are formed in the occipital plate 10. The shaping grooves 12 are preferably arranged at an angle with respect to the long axis direction of the kidney-shaped hole 11, and are generally obliquely formed in the occipital plate 10. The provision of the shaping grooves 12 enables the occipital plate 10 to be appropriately shaped during the operation to meet the needs of different patients. Preferably, a plurality of tool holes 13 are further formed in the occipital plate 10 to facilitate cooperation with the installation tool and make the implantation process more convenient.

[0081] The following exemplarily illustrates the usage steps of the occipital plate system of this embodiment:

[0082] First, insert the ball head seat 30 into the kidney-shaped hole 11 on the occipital bone plate 10, and then snap the snap ring 50 into the engagement groove 36 of the ball head seat 30. The above steps can be completed before leaving the factory. During the operation, implant the occipital bone plate 10 with the ball head seat 30 and the snap ring 50 into the occipital bone area. Then, according to the patient's condition, cut the other end of the first connecting rod 21 opposite to the ball head 211 to an appropriate length and install it into the connecting rod groove 222 of the first connecting block 22. Lock the first connecting rod 21 with the first set screw 51. Then, place the ball head 211 of the first connecting rod 21 into the accommodating cavity 31 of the ball head seat 30 and pre-lock it with the compression screw 40. Install the second connecting rod 24 into the mounting hole 232 of the second connecting block 23 and lock the second connecting rod 24 with the third set screw 53 to prevent the second connecting rod 24 from loosening. Axially connect the second connecting block 23 and the first connecting block 22, insert the angle locking handle 25 into the angle locking hole 261, and rotate the two relative to the axis according to the patient's condition, so that the included angle between the first connecting rod 21 and the second connecting rod 24 meets the required angle. After adjusting the angle, screw the second set screw 52 into the second set screw hole 262 for pre-locking. At this time, the tooth surfaces of the second connecting block 23 and the first connecting block 22 are engaged. At this time, in order to better match the lateral distance and angle of the two first connecting rods 21 between the cervical vertebra and the occipital bone, the ball head seat 30 can be rotated or the ball head seat 30 can be moved along the long axis of the kidney-shaped hole 11 according to the surgical requirements. After adjusting the angle between the neck and the pillow, lock the second set screw 52, lock the compression screw 40 and other pre-locked parts to complete the assembly.

[0083] In summary, the occipital plate system provided by the present invention includes an occipital plate, a connecting rod assembly, and a ball head seat. The connecting rod assembly includes a first connecting rod, and one end of the first connecting rod has a ball head. The ball head seat has a notch and a receiving cavity arranged along the axial direction of the ball head seat. The notch is opened along the radial direction of the ball head seat and communicates with the receiving cavity. The receiving cavity and the notch are open at one end facing the axial direction of the ball head seat. The radial inner dimension of the receiving cavity is adapted to the outer diameter of the ball head. The ball head is used for detachably arranging in the receiving cavity. The width of the notch is not less than the radial outer dimension of the corresponding part of the first connecting rod. The ball head seat is used for detachably arranging on the occipital plate and can rotate around the axis of the receiving cavity. The first connecting rod is configured to adjust the angle of the first connecting rod relative to the occipital plate by rotating the ball head in the receiving cavity and by rotating the ball head seat around the axis of the receiving cavity. With such a configuration, since the ball head of the first connecting rod is received in the receiving cavity of the ball head seat and there is no axial movement, the first connecting rod does not need to protrude from the ball head seat, reducing the notch of the occipital plate system and the foreign body sensation of the patient after surgery. Through the connection between the ball head of the first connecting rod and the ball head seat, the angle of the first connecting rod relative to the occipital plate can be conveniently adjusted without bending the first connecting rod to an appropriate angle. On the one hand, the strength and use effect of the first connecting rod will not be damaged. On the other hand, during the implantation process, only the components need to be simply assembled without bending the first connecting rod, making the implantation process more convenient and improving the surgical efficiency of the operator.

[0084] The above description is only a description of the preferred embodiments of the present invention and does not limit the scope of the present invention in any way. Any changes and modifications made by those of ordinary skill in the art of the present invention based on the above disclosure are within the scope of protection of the claims.

Claims

1. An occipital plate system, characterized in that, Comprising: an occipital bone plate, a connecting rod assembly, a ball head seat, and a compression screw; the connecting rod assembly includes a first connecting rod, and one end of the first connecting rod has a ball head; the ball head seat has a notch and a receiving cavity arranged along the axial direction of the ball head seat, the notch is opened along the radial direction of the ball head seat and communicates with the receiving cavity; the receiving cavity and the notch are open at one end facing the axial direction of the ball head seat; the radial inner dimension of the receiving cavity is adapted to the outer diameter of the ball head, the ball head is used for being detachably arranged in the receiving cavity, and the width of the notch is not less than the radial outer dimension of the corresponding part of the first connecting rod; the ball head seat is used for being detachably arranged on the occipital bone plate and can rotate around the axis of the receiving cavity; the first connecting rod is configured to adjust the angle of the first connecting rod relative to the occipital bone plate by rotating the ball head in the receiving cavity and by rotating the ball head seat around the axis of the receiving cavity; the compression screw has an external thread, the receiving cavity has an internal thread adapted to the external thread, and the compression screw is detachably threadedly connected to the ball head seat for locking the ball head; the occipital bone plate includes a through oblong hole; the long axis direction of the oblong hole is arranged at an angle to the projection of the first connecting rod on the occipital bone plate; the ball head seat is used for being detachably arranged in the oblong hole, the short axis dimension of the oblong hole is adapted to the radial outer dimension of the corresponding part of the ball head seat, and the position of the ball head seat along the long axis direction of the oblong hole is adjustably arranged.

2. The occipital plate system according to claim 1, wherein The external thread is a negative angle thread; the negative angle thread direction of the internal thread faces away from the open end of the receiving cavity.

3. The occipital plate system according to claim 2, wherein, The ball head is in point contact or line contact with the compression screw; and / or, the ball head is in point contact or line contact with the end of the receiving cavity far from the open end.

4. The occipital bone plate system according to claim 3, wherein the compression screw includes a compression end face and a first depression, the compression end face is used for facing the ball head, the first depression is opened on the compression end face, and the compression screw is in point contact or line contact with the ball head through the edge of the first depression on the compression end face; and / or the ball head seat includes a limiting surface and a second depression, the limiting surface is located at one end of the receiving cavity along the axial direction away from the open end, the second depression is opened on the limiting surface, and the receiving cavity is in point contact or line contact with the ball head through the edge of the second depression on the limiting surface.

5. The occipital bone plate system according to claim 4, wherein the compression screw includes a first through hole penetrating along the axial direction, the first through hole is configured as the first depression, and when the compression screw cooperates with the ball head, the axis of the first through hole passes through the center of the ball of the ball head; and / or the ball head seat includes a second through hole penetrating along the axial direction, the second through hole is configured as the second depression, and when the compression screw cooperates with the ball head, the axis of the second through hole passes through the center of the ball of the ball head.

6. The occipital plate system according to claim 5, wherein The ball head seat includes a bottom plate, a clamping groove and a receiving seat connected in sequence, and the receiving cavity and the notch are provided on the receiving seat; The minimum radial outer dimension of the bottom plate is greater than the short axis dimension of the kidney-shaped hole; The clamping groove is annularly formed along the circumferential direction of the ball head seat. The outer diameter of the clamping groove is adapted to the short axis dimension of the kidney-shaped hole, and the axial width of the clamping groove is adapted to the thickness of the occipital bone plate; The minimum radial outer dimension of the receiving seat is not greater than the short axis dimension of the kidney-shaped hole, and the maximum radial outer dimension of the receiving seat is greater than the short axis dimension of the kidney-shaped hole.

7. The occipital plate system according to claim 6, wherein The occipital bone plate system further includes a snap ring. The snap ring has a radially extending opening. The inner diameter of the snap ring is adapted to the outer diameter of the clamping groove, and the radial outer dimension of the snap ring is greater than the short axis dimension of the kidney-shaped hole; the snap ring is used for detachably clamping in the clamping groove to limit the axial degree of freedom of the ball head seat relative to the occipital bone plate.

8. The occipital plate system according to claim 1, characterized in that, The connecting rod assembly further includes a first connecting block, a second connecting block and a second connecting rod; the first connecting block is detachably connected to the first connecting rod; the second connecting block is detachably connected to the first connecting block; the second connecting rod is detachably connected to the second connecting block; One end face of the first connecting block has a first tooth surface; One end face of the second connecting block has a second tooth surface adapted to the first tooth surface; when the first connecting block and the second connecting block are configured to be axially engaged and connected through the first tooth surface and the second tooth surface, the relative circumferential degree of freedom is restricted.

9. The occipital plate system according to claim 8, wherein The first connecting block includes a connecting rod groove that penetrates the first connecting block in the radial direction. The radial inner dimension of the connecting rod groove is adapted to the radial outer dimension of the first connecting rod, and the first connecting rod is detachably inserted into the connecting rod groove.

10. The occipital plate system according to claim 9, wherein The occipital bone plate system further includes a first set screw. The first connecting block is provided with a first set screw hole in the radial direction. The first set screw hole communicates with the connecting rod groove. The first set screw hole has a thread adapted to the first set screw, and the first set screw is detachably arranged in the first set screw hole through the thread for locking the first connecting rod.

11. The occipital plate system according to claim 10, wherein The connecting rod groove is open to one end face of the first connecting block in the axial direction. The connecting rod groove includes a first region and a second region along the extending direction of the first set screw hole. The length of the first region along the extending direction of the first set screw hole is the same as the width of the opening of the connecting rod groove on the end face of the first connecting block, and the second region is adjacent to the side of the first region away from the first set screw hole.

12. The occipital plate system according to claim 8, wherein, The occipital plate system further includes a second set screw; one of the first connecting block and the second connecting block includes an angular locking handle, and the other includes an angular locking hole and a second set hole. The angular locking handle is used for detachably inserting into the angular locking hole; the second set hole communicates with the angular locking hole along the radial direction of the angular locking hole; the second set hole has a thread adapted to the second set screw, and the second set screw is used for detachably setting in the second set hole through the thread to at least limit the axial freedom of the angular locking handle along the direction towards the tooth surface of the connecting block where it is located.

13. The occipital plate system according to claim 12, characterized in that, The angular locking handle includes an inclined surface that inclines inward towards the tooth surface of the connecting block where it is located. When the first tooth surface and the second tooth surface are configured to be meshed and connected axially, the minimum distance between the inclined surface and the tooth surface of the connecting block where it is located is greater than the distance between the axis of the second set hole and the tooth surface of the connecting block where it is located.

14. The occipital plate system according to claim 13, wherein, One end of the second set screw facing the angular locking handle includes a conical surface that inclines inward towards the angular locking handle. The conical surface abuts against the inclined surface to limit the axial freedom of the angular locking handle along the direction towards the tooth surface of the connecting block where it is located.

15. The occipital plate system according to claim 8, wherein, The second connecting block has a mounting hole opened along the radial direction, and the second connecting rod is used for detachably setting in the mounting hole through the thread.

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