A slot adjusting structure of a universal cross connector

Abstract

This utility model relates to the field of medical device technology, specifically to a slot adjustment structure for a universal horizontal connector, applied to a first and second horizontal connector. Both the first and second horizontal connectors have clamping slots for positioning the nail rod. A screw engages with a screw hole formed on the hook body, and a driving inclined surface is formed on the screw. By adding a pressure block, this utility model utilizes the axial movement of the screw to drive the sliding of the pressure block, thereby allowing the pressure block to clamp the nail rod in conjunction with the hook body. This transforms the traditional point-line contact into a large-area surface contact, providing a more uniform clamping pressure. This makes the force state of the nail rod within the clamping slot more stable, less prone to skewing or rotation, reduces contact pressure, disperses stress, and reduces the risk of fatigue fracture of the nail rod near the contact point due to localized high pressure, thus improving the reliability of friction fixation.

Description

Technical Field

[0001] This utility model relates to the field of medical device technology, and in particular to a slot adjustment structure for a universal cross connector. Background Technology

[0002] In the surgical treatment of spinal fractures, deformities and other lesions, the spinal internal fixation system constructs a mechanically stable framework through the implanted rod-and-screw structure to maintain the normal function of the spine. The posterior transverse connection device (transverse connector) spans and connects the longitudinal rod-and-screw systems on both sides, which can significantly enhance the anti-rotational stability of the overall structure and prevent the loss of correction.

[0003] Currently, common cross-connectors include two cross-connecting hooks. Each cross-connecting hook consists of a hook body and a rod body. The hook body of the cross-connecting hook has a clamping groove for accommodating the nail bar and a screw hole. A locking screw is installed in the screw hole. The head of the screw has a downward conical surface (or conical contact surface). The working principle of the existing technology is: when the screw is turned so that it moves axially inward (downward), the conical surface of its head directly presses against the surface of the nail bar located in the clamping groove, forcing the nail bar to stick tightly to the groove wall, thereby locking the nail bar by relying on the friction between the two.

[0004] However, the existing design has a significant flaw: due to the geometric characteristics of the screw conical surface and the cylindrical nail bar surface, they actually form an approximate line contact or a very small area of ​​contact. Once loosened, the screw conical surface may completely lose contact with the nail bar, the nail bar loses effective fixation of the transverse hook, resulting in failure of the transverse connection function, which directly weakens the anti-rotation stability and overall strength of the entire nail bar system. Utility Model Content

[0005] In view of this, the purpose of this utility model is to propose a slot adjustment structure for a universal cross connector to solve the technical problem that the contact area between the existing universal cross connector and the nail bar is too small, which makes it impossible to effectively and evenly distribute the contact pressure, causing the internal fixation to easily loosen and fail.

[0006] Based on the above objectives, this utility model provides a slot adjustment structure for a universal horizontal connector, which is applied to the first horizontal connector and the second horizontal connector. The hook bodies of the first horizontal connector and the second horizontal connector are both formed with clamping slots for positioning the nail bar.

[0007] A screw that engages with a screw hole provided on the hook body, the screw having a drive bevel formed thereon;

[0008] A clamping block is slidably disposed on the hook body and adjacent to the clamping groove. The side of the clamping block facing the clamping groove has a clamping surface adapted to the outer contour of the nail bar. A driven inclined surface is formed on the clamping block to cooperate with the driving inclined surface. By rotating the screw, the driving inclined surface can be driven to act on the driven inclined surface, converting the axial movement of the screw into a force that pushes the clamping block to slide, thereby causing the clamping surface to move to the clamping groove to clamp the nail bar located therein.

[0009] As a preferred embodiment of this utility model, the pressure block is provided with a guide rod at one end away from the clamping surface, and the guide rod is slidably engaged with a guide groove formed in the hook body.

[0010] As a preferred embodiment of this invention, each of the pressure blocks is provided with at least two guide rods.

[0011] As a preferred embodiment of this utility model, the clamping surface of the pressure block and / or the clamping groove of the hook body are provided with an anti-slip part, which is used to increase the contact friction between the clamping surface and / or the clamping groove and the nail rod.

[0012] As a preferred embodiment of this invention, the anti-slip part is an anti-slip texture.

[0013] As a preferred embodiment of this utility model, the anti-slip part is an anti-slip protrusion.

[0014] As a preferred embodiment of this utility model, the anti-slip protrusions are multiple and distributed at intervals along the width direction of the clamping surface of the pressure block.

[0015] As a preferred embodiment of this utility model, the first horizontal connecting hook includes a first hook body and a first connecting rod connected to each other, and the second horizontal connecting hook includes a second hook body and a second connecting rod connected to each other. A fixing part for fixing the first connecting rod and the second connecting rod is provided between them, and the fixing part includes:

[0016] A sleeve with a threaded post at the top is provided, the sleeve having a through hole for the second connecting rod to pass through, and the surface of the first connecting rod having a through groove for the threaded post to pass through.

[0017] A nut that is compatible with the threaded post.

[0018] The beneficial effects of this utility model are as follows: By adding a pressure block, the axial movement of the screw can drive the pressure block to slide, thereby enabling the pressure block to clamp the nail bar with the hook body. This changes the traditional point-line contact to a large-area surface contact, providing a more uniform clamping pressure. This makes the force state of the nail bar in the clamping groove more stable, less prone to skewing or rotation, reduces contact pressure, disperses stress, reduces the risk of fatigue fracture of the nail bar near the contact point due to local high pressure, and improves the reliability of friction fixing. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in this utility model 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 for this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the top three-dimensional structure of this utility model;

[0021] Figure 2 This is a schematic diagram of the bottom three-dimensional structure of this utility model;

[0022] Figure 3 This is a schematic diagram of the main cross-section of the present invention;

[0023] Figure 4 This is a half-sectional three-dimensional structural diagram of the first hook body and the first connecting rod of this utility model;

[0024] Figure 5 This is a schematic diagram of the three-dimensional structure of the pressing block of this utility model.

[0025] The following are marked in the diagram: 1. First hook body; 2. First connecting rod; 3. Screw hole; 4. Screw; 5. Pressure block; 6. Anti-slip protrusion; 7. Guide rod; 8. Guide groove; 9. Driven inclined plane; 10. Driving inclined plane; 11. Through groove; 12. Threaded post; 13. Sleeve; 14. Nut; 15. Second hook body; 16. Second connecting rod. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to specific embodiments.

[0027] It should be noted that, unless otherwise defined, the technical or scientific terms used in this utility model should have the ordinary meaning understood by one of ordinary skill in the art to which this utility model pertains. The terms "first," "second," and similar terms used in this utility model do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0028] like Figure 1 , Figure 2 and Figure 3 As shown, a slot adjustment structure for a universal cross connector is applied to a first cross hook and a second cross hook. Both the first and second cross hooks have clamping slots for positioning the nail bar. A screw 4 engages with a screw hole 3 on the hook body, and a driving inclined surface 10 is formed on the screw 4. A pressure block 5 is slidably disposed on the hook body and adjacent to the clamping slot. The side of the pressure block 5 facing the clamping slot has a clamping surface adapted to the outer contour of the nail bar. A driven inclined surface 9 is formed on the pressure block 5 to engage with the driving inclined surface 10. By rotating the screw 4, the driving inclined surface 10 can be driven to act on the driven inclined surface 9, converting the axial movement of the screw 4 into a force that pushes the pressure block 5 to slide, thereby causing the clamping surface to move to the clamping slot to clamp the nail bar located therein.

[0029] The above technical solution can effectively improve the fixing effect of the first and second horizontal hooks on the nail bar. By adding a sliding pressure block 5 on the hook body, the axial movement of the screw 4 can drive the sliding of the pressure block 5, so that the pressure block 5 cooperates with the hook body to clamp the nail bar, changing from traditional point-line contact to large-area surface contact, providing a more uniform clamping pressure, making the force state of the nail bar in the clamping groove more stable, less prone to deflection or rotation, reducing contact pressure, dispersing stress, reducing the risk of fatigue fracture of the nail bar near the contact point due to local high pressure, and improving the reliability of friction fixing.

[0030] like Figure 4 and Figure 5 As shown, in this embodiment, the pressure block 5 is provided with a guide rod 7 at one end away from the clamping surface, and the guide rod 7 slides in conjunction with the guide groove 8 opened in the hook body;

[0031] The above technical solution can ensure that the pressure block 5 can move in the preset direction and prevent the pressure block 5 from moving skewed. In order to ensure that the pressure block 5 slides stably, each pressure block 5 is provided with at least two guide rods 7.

[0032] like Figure 2 and Figure 5 As shown, in this embodiment, the clamping surface of the pressure block 5 and / or the clamping groove of the hook body are provided with anti-slip parts. The anti-slip parts are used to increase the contact friction between the clamping surface and / or the clamping groove and the nail bar; for example, the anti-slip parts can be anti-slip textures.

[0033] The above technical solution can further improve the contact friction coefficient between the pressure block 5 and the hook body and the nail bar. In particular, the anti-slip texture can significantly increase the roughness of the clamping surface of the pressure block 5 and the clamping groove surface of the hook body, making it less likely for the smooth cylindrical surface of the nail bar to slip in the contact area with the pressure block 5 and the hook body.

[0034] like Figure 5 As shown, in this embodiment, the anti-slip part is an anti-slip protrusion 6; there are multiple anti-slip protrusions 6 and they are spaced apart along the width direction of the clamping surface of the pressure block 5;

[0035] The above technical solution can increase the roughness of the clamping surface of the pressure block 5 and the clamping groove surface of the hook by setting anti-slip protrusions 6. The anti-slip protrusions 6 are essentially in contact with the nail bar line, but the difference is that there are enough of these line contacts and they are dense enough to get infinitely close to the surface, which can prevent the nail bar from loosening due to the failure of a certain part.

[0036] like Figure 3 and Figure 4 As shown, in this embodiment, the first horizontal connecting hook includes a first hook body 1 and a first connecting rod 2 connected to each other, and the second horizontal connecting hook includes a second hook body 15 and a second connecting rod 16 connected to each other. A fixing part for fixing the two is provided between the first connecting rod 2 and the second connecting rod 16. The fixing part includes: a sleeve 13 with a threaded post 12 at the top end, the sleeve 13 having a through hole for the second connecting rod 16 to pass through, and a through groove 11 for the threaded post 12 to pass through on the surface of the first connecting rod 2; and a nut 14 adapted to the threaded post 12.

[0037] The above technical solution can ensure that the first horizontal connecting hook and the second horizontal connecting hook can be fixed. At the same time, the length of the first horizontal connecting hook and the second horizontal connecting hook can be adjusted through the fixing part. Also, the axial rotation of the first horizontal connecting hook and the second horizontal connecting hook can be realized through the fixing part to adapt to different angle and length adjustment requirements. This part is the prior art, and its principle is well known to those skilled in the art. It will not be described in detail here.

[0038] Working principle: In use, the length and angle of the first and second horizontal hooks of the universal connector are adjusted by fixing part to ensure that the first hook body 1 and the second hook body 15 can bite the nail bar. Then, the screw 4 is rotated by tool. When the screw 4 rotates, it will move in the axial direction. The driving inclined surface 10 at the bottom of the screw 4 contacts the driven inclined surface 9 of the pressure block 5, thereby pushing the pressure block 5 to slide. The guide rod 7 and the guide groove 8 cooperate to guide the pressure block 5 to move straight close to the nail bar until the clamping surface of the pressure block 5 contacts the nail bar and generates sufficient pressure to prevent the nail bar from sliding relative to the hook body.

[0039] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of the present invention (including the claims) is limited to these examples; within the framework of the present invention, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of the different aspects of the present invention as described above, which are not provided in the details for the sake of brevity.

[0040] This utility model is intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A slot adjustment structure for a universal cross connector, applied to a first cross hook and a second cross hook, wherein a clamping slot for positioning a nail bar is formed on the hook body of both the first cross hook and the second cross hook. Its features are, The structure also includes: A screw (4) engages with a screw hole (3) provided on the hook body, and a drive ramp (10) is formed on the screw (4). A pressure block (5) is slidably disposed on the hook body and adjacent to the clamping groove. The side of the pressure block (5) facing the clamping groove has a clamping surface adapted to the outer contour of the nail bar. A driven inclined surface (9) that cooperates with the driving inclined surface (10) is formed on the pressure block (5). By rotating the screw (4), the driving inclined surface (10) can be driven to act on the driven inclined surface (9), converting the axial movement of the screw (4) into a force that pushes the pressure block (5) to slide, thereby causing the clamping surface to move to the clamping groove to clamp the nail bar located therein.

2. The slot adjustment structure of the universal joint according to claim 1, characterized in that, The pressure block (5) has a guide rod (7) at one end away from the clamping surface, and the guide rod (7) slides in conjunction with the guide groove (8) opened in the hook body.

3. The slot adjustment structure of the universal joint according to claim 2, characterized in that, Each of the pressure blocks (5) is provided with at least two guide rods (7).

4. The slot adjustment structure of the universal joint according to claim 1, characterized in that, The clamping surface of the pressure block (5) and / or the clamping groove of the hook body are provided with anti-slip parts, which are used to increase the contact friction between the clamping surface and / or the clamping groove and the nail rod.

5. The slot adjustment structure of the universal joint according to claim 4, characterized in that, The anti-slip part is an anti-slip texture.

6. The slot adjustment structure of the universal joint according to claim 4, characterized in that, The anti-slip part is an anti-slip protrusion (6).

7. The slot adjustment structure of the universal joint according to claim 6, characterized in that, The anti-slip protrusions (6) are multiple and are spaced apart along the width direction of the clamping surface of the pressure block (5).

8. The slot adjustment structure of the universal joint according to any one of claims 1-7, characterized in that, The first horizontal connecting hook includes a first hook body (1) and a first connecting rod (2) connected to each other. The second horizontal connecting hook includes a second hook body (15) and a second connecting rod (16) connected to each other. A fixing part for fixing the two is provided between the first connecting rod (2) and the second connecting rod (16). The fixing part includes: A sleeve (13) with a threaded post (12) at the top is provided. The sleeve (13) has a through hole for the second connecting rod (16) to pass through. The surface of the first connecting rod (2) has a through groove (11) for the threaded post (12) to pass through. Nut (14) adapted to the threaded post (12).

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