Hanging block for fracture fixation

Abstract

Aiming at the problems in the prior art, the utility model provides the hanging block for fracture fixation, which comprises a cylindrical rod, a hanging block, a ball screw and an inclined slide block, the hanging block can be directly hooked on the cylindrical rod during an operation, and the hanging block can be fixed on the cylindrical rod only by screwing the ball screw and the inclined slide block, so that the operation is convenient, and the operation efficiency is improved. And the operation difficulty is reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of bone correction devices, and in particular relates to a hanging block for bone fixation. Background Art

[0002] As a new type of internal fixation device, the rod-block combination internal fixation system has been clinically proven to have advantages in the treatment of limb fractures.

[0003] The existing rod-block combination internal fixation system usually includes: a connecting rod, a fixing block and a hanging block. Compared with the fixing block, the hanging block is provided with an opening on the connecting rod hole. During the operation, the hanging block can be hooked on the connecting rod through the opening at any time without adjusting other fixed fixing blocks or hanging blocks, thereby increasing the flexibility of the rod-block combination internal fixation system. However, since the existing hanging block needs to cover the opening when fixed on the connecting rod, the component covering the opening cannot be pre-installed before the hanging block is hooked on the connecting rod. The component covering the opening is generally small, and is affected by the use environment during the operation, making the use of the hanging block difficult to operate during the operation. Utility Model Content

[0004] The utility model aims at the problems existing in the prior art and provides a bone fixation hanging block, comprising: a cylindrical rod, a hanging block, a ball screw, and an inclined sliding block. The hanging block comprises a hook and a hanging body, the hanging body is provided with a bone screw hole and a composite hole composed of an upper hole and a lower hole, the ball screw is provided with a ball-shaped nail head and a nail tail with a thread, and the inclined sliding block is provided with a threaded hole, an inclined surface 1, and an inclined surface 2;

[0005] The hook is semicircular and adapted to the cylindrical rod, and is provided with an opening through which the hook is hung on the cylindrical rod;

[0006] The upper hole is a hole where a hemisphere and a cylinder are connected and whose diameter is close to the diameter of the nail head. The axis of the upper hole cylinder is 30° to 60° with the axis of the ball head screw. The lower hole is a square hole adapted to the shape of the inclined slider. One end of the lower hole is connected to the hook and the other end is an inclined wall matching the inclined surface.

[0007] The nail head of the ball screw is placed in the upper hole, the inclined sliding block is placed in the lower hole, and the nail tail of the ball screw passes through the upper hole and matches with the threaded hole on the inclined sliding block in the lower hole to form a threaded connection;

[0008] Before use, the nail tail is not completely screwed into the threaded hole so that there is a sufficient distance between the nail head and the first bevel, the ball screw and the bevel slider are located on the side of the composite hole away from the hook, and the second bevel does not block the hook opening. When in use, first hang the hook on the cylindrical rod, and then continue to screw the nail tail into the threaded hole, so that the nail head and the first bevel are close to each other, the nail head presses the upper hole, and the first bevel presses the lower hole. Under the action of the cylindrical surface of the upper hole and the inclined wall of the lower hole, the ball screw and the bevel slider approach the hook at the same time during the tightening process. When the nail tail is completely screwed into the threaded hole, the second bevel blocks the hook opening and presses the cylindrical rod. The cylindrical rod is fixed in the hook under the encirclement and pressure of the inner wall of the hook and the second bevel, so that the cylindrical rod and the hanging block form a fixed connection.

[0009] Furthermore, the ball screw is provided with a driving hole, and a tool matching the driving hole is used to screw the ball screw into the inclined slider to provide a greater torque, so that the cylindrical rod and the hanging block form a more stable fixed connection.

[0010] Furthermore, the opening of the hook is 60° to 80° with the axis of the ball screw. When the nail tail is completely screwed into the threaded hole, the surrounding opening formed by the hook and the second inclined surface is made smaller, preventing the cylindrical rod from falling out of the hook.

[0011] Furthermore, the threaded hole is threadedly connected with one end of a matching bone screw, and the other end of the bone screw is implanted into the bone, so that the bone fixation hanging block is fixed on the bone.

[0012] The utility model has at least one of the following advantages:

[0013] The ball screw and the inclined plane slider of the utility model can be pre-installed on the hanging block before the operation without blocking the opening of the hook. During the operation, the hanging block can be directly hooked on the cylindrical rod. There is no need to pick up the ball screw and the inclined plane slider and insert them into the hanging block during the operation. The hanging block can be fixed on the cylindrical rod by only tightening the ball screw and the inclined plane slider, which facilitates the operation and reduces the difficulty of the operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 The figure shows a structural schematic diagram of a bone fixation hanging block of the utility model;

[0015] Figure 2 The figure shows a cross-sectional schematic diagram of a bone fixation hanging block at a ball screw before use of the hanging block of the utility model;

[0016] Figure 3 The figure shows a cross-sectional schematic diagram of a hanging block at the ball screw when the nail tail of a hanging block for bone fixation of the utility model is completely screwed into a threaded hole;

[0017] Figure 4 The figure shows the structure diagram of the hanging block of the utility model;

[0018] Figure 5 Shown is a structural schematic diagram of the other side of the hanging block of the utility model;

[0019] Figure 6 The figure shows the structure diagram of the ball head screw of the utility model;

[0020] Figure 7 The figure shows the structure diagram of the inclined sliding block of the utility model;

[0021] In the figure: 1 cylindrical rod, 2 hanging block, 201 hook, 202 hanging body, 203 bone screw hole, 204 upper hole, 205 lower hole, 206 compound hole, 3 ball head screw, 301 nail head, 302 nail tail, 303 driving hole, 4 inclined slider, 401 threaded hole, 402 inclined plane 1, 403 inclined plane 2. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0023] Example 1

[0024] Before use, the nail head 301 of the ball head screw 3 is placed in the upper hole 204, the inclined slider 4 is placed in the lower hole 205, the nail tail 302 of the ball head screw 3 passes through the upper hole and is partially screwed into the threaded hole 401 on the inclined slider 4 in the lower hole 205, and the ball head screw 3 and the inclined slider 4 are placed in the composite hole 206 on the side away from the hook 201.

[0025] When in use, first hang the hook 201 on the cylindrical rod 1, and then continue to screw the nail tail 302 into the threaded hole 401. Under the action of the cylindrical surface of the upper hole 204 and the inclined wall of the lower hole 205, the ball head screw 3 and the inclined slider 4 simultaneously approach the hook 201 during the tightening process. When the nail tail 302 is completely screwed into the threaded hole 401, the second inclined surface 403 blocks the opening of the hook 201 and presses the cylindrical rod 1. The cylindrical rod 1 is fixed in the hook 201 under the encirclement and pressure of the inner wall of the hook 201 and the second inclined surface 403, so that the cylindrical rod 1 and the hanging block 2 form a fixed connection.

[0026] It should be noted and understood that various modifications and improvements can be made to the utility model described in detail above without departing from the spirit and scope of the claims of the utility model. Therefore, the scope of the technical solution claimed is not limited by any specific exemplary teaching given.

Claims

1. A hanging block for bone fixation, characterized in that: include: A cylindrical rod (1), a hanging block (2), a ball screw (3), and an inclined sliding block (4), wherein the hanging block (2) comprises a hook (201) and a hanging body (202), the hanging body (202) is provided with a bone screw hole (203) and a composite hole (206) formed by combining an upper hole (204) and a lower hole (205), the ball screw (3) is provided with a ball-shaped nail head (301) and a nail tail (302) with a thread, and the inclined sliding block (4) is provided with a threaded hole (401), an inclined surface 1 (402), and an inclined surface 2 (403); The hook (201) is semicircular and adapted to the cylindrical rod (1). The hook (201) is provided with an opening, and the hook (201) is hung on the cylindrical rod (1) through the opening. The upper hole (204) is a hole where a hemisphere and a cylinder are connected and the diameter is close to the diameter of the nail head (301). The axis of the cylinder of the upper hole (204) is 30° to 60° with the axis of the ball head screw (3). The lower hole (205) is a square hole adapted to the shape of the inclined plane slider (4). One end of the lower hole (205) is connected to the hook (201) and the other end is an inclined wall matched with the inclined plane (402). The nail head (301) of the ball screw (3) is placed in the upper hole (204), the inclined sliding block (4) is placed in the lower hole (205), and the nail tail (302) of the ball screw (3) passes through the upper hole and matches with the threaded hole (401) on the inclined sliding block (4) of the lower hole (205) to form a threaded connection.

2. A bone fixation hanging block according to claim 1, characterized in that: The ball screw (3) is provided with a driving hole (303). A tool matching the driving hole (303) is used to screw the ball screw (3) into the inclined sliding block (4) to provide a greater torque, so that the cylindrical rod (1) and the hanging block (2) form a more stable fixed connection.

3. A bone fixation hanging block according to claim 1, characterized in that: The opening of the hook (201) is at an angle of 60° to 80° with the axis of the ball screw (3). When the nail tail (302) is completely screwed into the threaded hole (401), the surrounding opening formed by the hook (201) and the second inclined surface (403) is made smaller, thereby preventing the cylindrical rod (1) from coming out of the hook (201).

4. A bone fixation hanging block according to claim 1, characterized in that: The bone screw screw hole (203) is threadedly connected with one end of a matching bone screw, and the other end of the bone screw is implanted into the bone, so that the bone fixation hanging block is fixed on the bone.

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