Anterior cervical dynamic fixing system

Abstract

The utility model discloses an anterior cervical dynamic fixing system which comprises at least two top blocks, a plurality of sliding blocks and at least two connecting rods, two ends of each connecting rod are respectively connected with one top block, the plurality of sliding blocks are suitable for sliding along the axial direction of the connecting rods, and the sliding blocks and the top blocks are respectively connected with a cervical vertebra body through bone screws. The anterior cervical spine fixing device can be clinically assembled according to the requirements of different patients to form products of different specifications and sizes, and the defect that existing anterior cervical spine fixing products are fixed in specification and size and cannot adapt to the body types of all the patients is overcome; meanwhile, after the product is assembled into a fixing system, the middle sliding block has the degree of freedom of sliding in the axial direction of the connecting rod, non-fixed fusion can be achieved, fusion degeneration of the middle segment centrum is avoided, and the function of the cervical vertebra is reserved.

Description

Technical Field

[0001] This utility model relates to the field of medical device technology, and in particular to a dynamic fixation system for the anterior cervical spine. Background Technology

[0002] Current anterior cervical spine fixation systems typically use a plate with a fixed number of pre-drilled screw holes. These holes correspond to the arrangement of the cervical vertebrae, and the plate is fixed to the vertebrae using screws to achieve fusion. However, existing products have some shortcomings in clinical application. First, due to variations in patient body shape, the size of cervical vertebrae varies considerably. A single product size design cannot meet clinical needs, necessitating the design and preparation of various specifications to match different patients. This results in a large inventory and increased costs. Furthermore, there is a risk of unsatisfactory surgical reduction due to the selection of an incompatible size. Second, because the fixation plate is a single piece of sheet metal, the screw holes are fixed in position. In multi-segment surgeries, all involved vertebrae are fixed to the plate via bone screws to form a stable whole, achieving complete fusion and fixation. This can lead to functional loss in intermediate vertebral segments. Utility Model Content

[0003] The purpose of this application is to provide an anterior cervical spine dynamic fixation system to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, this application provides the following technical solution:

[0005] A dynamic fixation system for the anterior cervical spine includes at least two top blocks, several sliders, and at least two connecting rods. The two ends of each connecting rod are connected to one of the top blocks, and the several sliders are adapted to slide along the axial direction of the connecting rods. The sliders and top blocks are connected to the cervical vertebral bodies by bone screws.

[0006] Optionally, the top block has a first through hole on the side where it connects to the connecting rod, and the connecting rod passes through the first through hole. The top block has a first fixing hole that penetrates its upper and lower surfaces, and the wall of the first fixing hole and the wall of the first through hole have an intersecting part to form a hole.

[0007] Optionally, the first fixing hole includes a first hole and a second hole arranged sequentially along the axial direction, wherein the shape of the first hole is adapted to the shape of the bone screw head, and the second hole is cylindrical.

[0008] Optionally, the hole is located on the wall of the first hole.

[0009] Optionally, the top block is provided with positioning holes that penetrate its upper and lower surfaces.

[0010] Optionally, the slider is provided with a second through hole along the axial direction of the connecting rod.

[0011] Optionally, the slider is provided with a second fixing hole penetrating its upper and lower surfaces.

[0012] Optionally, the second fixing hole includes a third hole and a fourth hole arranged sequentially along the axial direction, wherein the shape of the third hole is adapted to the shape of the bone screw head, and the fourth hole is cylindrical.

[0013] Optionally, the first lower bone-attaching surface of the top block for contacting the cervical vertebral body is an arc-shaped surface that matches the cervical vertebral body;

[0014] And / or the second lower bone-attaching surface of the slider for contacting the cervical vertebral body is an arc-shaped surface that matches the cervical vertebral body.

[0015] Optionally, the connecting rod is cylindrical, and both ends of the connecting rod are rounded.

[0016] In summary, the technical effects and advantages of this utility model are as follows: This application can be assembled in clinical practice according to the needs of different patients to form products of different specifications and sizes, overcoming the defect that the specifications and sizes of existing anterior cervical fixation products cannot be adapted to all patient body types; at the same time, after the product is assembled into a fixation system, the middle slider has the freedom to slide along the axis of the connecting rod, which can achieve non-fixed fusion, avoid fusion and degeneration of the middle segment vertebral body, and facilitate the preservation of cervical spine function. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the anterior cervical spine dynamic fixation system in one embodiment of the present invention;

[0019] Figure 2 This is a schematic diagram of the top block in one embodiment of the present invention;

[0020] Figure 3 This is a right view of the top block in one embodiment of the present invention;

[0021] Figure 4 This is a half-sectional view of the top block in one embodiment of the present invention;

[0022] Figure 5 This is a schematic diagram of the slider structure in one embodiment of the present invention;

[0023] Figure 6 This is a right view of the slider in one embodiment of the present invention;

[0024] Figure 7 This is a half-sectional view of the slider in one embodiment of the present invention;

[0025] Figure 8 This is a schematic diagram of the connecting rod in one embodiment of the present invention.

[0026] in:

[0027] 01. Top block; 0101. First rod insertion hole; 0102. Positioning hole; 0103. First fixing hole; 010301. First hole; 010302. Second hole; 0104. First lower bone surface; 02. Slider; 03. Connecting rod; 0201. Second rod insertion hole; 0202. Second lower bone surface; 0203. Second fixing hole; 020301. Third hole; 020302. Fourth hole. Detailed Implementation

[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0029] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the system or component referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0030] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0031] Furthermore, the technical features involved in the different embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0032] This embodiment provides a dynamic fixation system for the anterior cervical spine, such as... Figures 1-8 As shown, the anterior cervical dynamic fixation system includes at least two top blocks 01, several sliders 02 and at least two connecting rods 03. The two ends of the connecting rods 03 are respectively connected to a top block 01, and the several sliders 02 are adapted to slide along the axial direction of the connecting rods 03. The sliders 02 and the top blocks 01 are respectively connected to the cervical vertebral bodies by bone screws.

[0033] This embodiment allows for clinical assembly according to the needs of different patients, forming products of different specifications and sizes. Two top blocks 01, two connecting rods 03, and one or more sliders 02 are assembled to form an anterior cervical fixation system. The sliders 02 can be selected according to the number of vertebral segments to ensure the stability of the patient's vertebrae. The length of the connecting rods 03 can be selected and adjusted by the clinical operator to adapt to the size requirements of different individuals. This overcomes the defect of existing anterior cervical fixation products with fixed specifications and sizes that cannot adapt to all patient body types. At the same time, after the product is assembled into a fixation system, the sliders 02 can slide on the connecting rods 03, retaining the degree of freedom of sliding along the axial direction of the connecting rods 03. The vertebrae fused with the sliders 02 can achieve a dynamic fixation clinical effect, avoiding fusion and degeneration of intermediate vertebral segments and facilitating the preservation of cervical spine function.

[0034] Specifically, the top block 01 has a first through hole 0101 on its side connecting to the connecting rod 03. The connecting rod 03 passes through the first through hole 0101, which can be a through hole or a blind hole. The end of the connecting rod 03 is inserted into the first through hole 0101. The top block 01 has a first fixing hole 0103 penetrating its upper and lower surfaces. The wall of the first fixing hole 0103 and the wall of the first through hole 0101 have an intersecting part to form a hole. The first fixing hole 0103 is used to install a bone screw. The bone screw contacts the connecting rod 03 through the hole, pressing the connecting rod 03. The bone screw fixes the top block 01 to the vertebral body and simultaneously connects and fixes the connecting rod 03 to the top block 01 together. In this embodiment, there are two first rod-through holes 0101. The top block 01 has a first rod-through hole 0101 on each of the left and right sides of the side of the connecting rod 03. There are also two first fixing holes 0103, which are located inside the rod-through holes.

[0035] Optionally, the first fixing hole 0103 includes a first hole 010301 and a second hole 010302 arranged sequentially along the axial direction. The shape of the first hole 010301 is adapted to the shape of the bone screw head, and the second hole 010302 is cylindrical. In this embodiment, the side of the bone screw head is spherical, and the hole wall of the first hole 010301 is spherical. This application does not impose specific limitations on the shape of the first hole 010301.

[0036] Optionally, the hole is located on the wall of the first hole 010301. The hole allows the spherical head of the bone screw to contact the connecting rod 03, thereby pressing the connecting rod 03 to achieve the installation of the connecting rod 03 and the top block 01.

[0037] Optionally, the top block 01 is provided with a positioning hole 0102 that extends through its upper and lower surfaces. The positioning hole 0102 can achieve temporary positioning and fixation during the operation, so that the operator can implant bone screws for final fixation.

[0038] Specifically, the slider 02 is provided with a second through hole 0201 along the axial direction of the connecting rod 03. The slider 02 is provided with a second fixing hole 0203 penetrating its upper and lower surfaces. In this embodiment, the second through hole 0201 is located on both sides of the second fixing hole 0203. The second through hole 0201 is a through hole, used for the connecting rod 03 to pass through, and the second fixing hole 0203 is used for installing bone screws.

[0039] Optionally, the second fixing hole 0203 includes a third hole 020301 and a fourth hole 020302 arranged sequentially along the axial direction. The shape of the third hole 020301 is adapted to the shape of the bone screw head, and the fourth hole 020302 is cylindrical. In this embodiment, the side of the bone screw head is spherical, and the hole wall of the third hole 020301 is spherical. This application does not impose specific limitations on the shape of the third hole 020301.

[0040] Optionally, the first lower bone-attaching surface 0104 of the top block 01, which contacts the cervical vertebral body, is an arc-shaped surface matching the cervical vertebral body; and / or the second lower bone-attaching surface 0202 of the slider 02, which contacts the cervical vertebral body, is an arc-shaped surface matching the cervical vertebral body. The lower surfaces of the top block 01 and the slider 02 are the first lower bone-attaching surface 0104 and the second lower bone-attaching surface 0202, respectively. The curvature of the first lower bone-attaching surface 0104 and the second lower bone-attaching surface 0202 is matched as closely as possible to the curvature of the anterior surface of the cervical vertebral body to avoid edge lifting and friction and irritation to surrounding muscle tissue. The edges of the top block 01 and / or the slider 02 are provided with rounded corners of different sizes to avoid cutting and irritating surrounding human tissues.

[0041] Optionally, in this embodiment, there are two connecting rods 03, which are respectively connected to the two ends of the slider 02 and the top block 01. The number of connecting rods 03 can also be 3 or 4, etc., and this application does not impose a specific limitation on the number of connecting rods 03.

[0042] Specifically, the connecting rod 03 is cylindrical with rounded ends to facilitate smooth insertion into the first through-hole 0101 and the second through-hole 0201 of the top block 01 and the slider 02 to form a complete fixation system. The connecting rod 03 and the top block 01 are compressed together by bone screws to form a stable system. The connecting rod 03 and the slider 02 are not fixedly connected; the slider 02 can slide along the axis of the connecting rod 03. The length of the connecting rod 03 can be selected and adjusted by the operator according to clinical needs. In this embodiment, the top block 01, connecting rod 03, and slider 02 can be freely assembled and connected to accommodate patients of different body types; simultaneously, dynamic fixation can be achieved, preserving vertebral function to the greatest extent possible.

[0043] Finally, it should be noted that the above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A dynamic cervical spine anterior fixation system, characterized by: The application relates to a cervical vertebra fixation device, which comprises at least two top blocks, a plurality of sliding blocks and at least two connecting rods, the two ends of the connecting rods are connected with the top blocks respectively, the sliding blocks are adapted to slide along the axial direction of the connecting rods, and the sliding blocks and the top blocks are connected with the cervical vertebra bodies through bone screws respectively.

2. The cervical spine anterior dynamic fixation system of claim 1, wherein, The side surface of the top block connected with the connecting rod is provided with a first rod penetrating hole, the connecting rod is arranged in the first rod penetrating hole, the top block is provided with a first fixing hole penetrating the upper and lower surfaces of the top block, the hole wall of the first fixing hole and the hole wall of the first rod penetrating hole have staggered positions to form a hole.

3. The cervical spine anterior dynamic fixation system of claim 2, wherein, The first fixing hole comprises a first hole and a second hole arranged in sequence along the axial direction, the shape of the first hole is matched with the shape of the head of a bone screw, and the second hole is in a cylindrical shape.

4. The cervical spine anterior dynamic fixation system of claim 3, wherein, The hole is located on the hole wall of the first hole.

5. The cervical spine anterior dynamic fixation system of claim 1 wherein, The top block is provided with a positioning hole penetrating the upper and lower surfaces of the top block.

6. The cervical spine anterior dynamic fixation system of claim 1 wherein, The sliding block is provided with a second rod penetrating hole along the axial direction of the connecting rod.

7. The cervical spine anterior dynamic fixation system of claim 1 wherein, The sliding block is provided with a second fixing hole penetrating the upper and lower surfaces of the sliding block.

8. The cervical spine anterior dynamic fixation system of claim 7, wherein, The second fixing hole comprises a third hole and a fourth hole arranged in sequence along the axial direction, the shape of the third hole is matched with the shape of the head of a bone screw, and the fourth hole is in a cylindrical shape.

9. The cervical spine anterior dynamic fixation system of claim 1 wherein, The first lower bone contacting surface of the top block for contacting the cervical vertebra body is an arc surface matched with the cervical vertebra body. The second lower bone contacting surface of the sliding block for contacting the cervical vertebra body is an arc surface matched with the cervical vertebra body.

10. The cervical spine anterior dynamic fixation system of claim 1 wherein, The connecting rod is in a cylindrical shape, and the two ends of the connecting rod are provided with round corners.

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