A rat bone external fixation bracket

Abstract

The utility model provides a rat bone external fixation support, including stepping motor, threaded rod, support rod, main support, sliding block and control system, the drive shaft of stepping motor is connected with threaded rod, one end of main support is equipped with fixed block, is equipped with the first through hole of the both sides of the fixed block, one end of support rod is installed on stepping motor, the other end of support rod is connected with fixed block, sliding block is arranged on main support, is equipped with the first threaded hole of the both sides of sliding block, threaded rod is arranged in first through hole and first threaded hole, and threaded rod is connected with first threaded hole screw, control system is connected with stepping motor, and is equipped with kirschner wire on fixed block and sliding block. The utility model can realize high accuracy micro -control, can satisfy the skeletal fixation demand under the complex experimental environment.

Description

Technical Field

[0001] This utility model belongs to the field of medical device technology, and in particular relates to an external fixation frame for rat bones. Background Technology

[0002] Micromotion-induced ossification is a technique that promotes fracture healing by applying periodic, minute mechanical stimulation. Its principle is to stimulate osteocyte activity with moderate dynamic stress, accelerating callus formation and bone regeneration. Studies have shown that micromotion stimulation can effectively promote blood revascularization and callus mineralization at the fracture site, significantly shortening fracture healing time. However, existing external fixators have significant shortcomings in achieving micromotion-induced ossification: traditional fixators rely heavily on manual adjustment, making precise micromotion control difficult, and they are also unsuitable for use on small experimental animals (such as SD rats). Utility Model Content

[0003] The purpose of this invention is to provide a rat external fixation frame that can achieve high-precision micro-motion control and meet the bone fixation requirements in complex experimental environments.

[0004] This utility model is achieved through the following technical solution:

[0005] An external fixation frame for rats includes a stepper motor, a threaded rod, a support rod, a main support, a sliding block, and a control system. The drive shaft of the stepper motor is connected to the threaded rod. One end of the main support is provided with a fixing block, and the fixing block has a first through hole penetrating both sides. One end of the support rod is mounted on the stepper motor, and the other end of the support rod is connected to the fixing block. The sliding block is slidably disposed on the main support, and the sliding block has a first threaded hole penetrating both sides. The threaded rod passes through the first through hole and the first threaded hole, and the threaded rod is threadedly connected to the first threaded hole. The control system is connected to the stepper motor. Kirschner wires are provided on both the fixing block and the sliding block.

[0006] Furthermore, the sliding block is provided with a sliding groove, and the main support is inserted into the sliding groove and slidably connected to the sliding groove.

[0007] Furthermore, it also includes multiple limiting bolts. One end of the sliding block is provided with a sliding plate that contacts the side of the main support. A strip hole is provided on the sliding plate. Multiple second threaded holes are provided at intervals along the length of the strip hole on the main support. Multiple limiting bolts pass through the strip hole and are threadedly connected to the multiple second threaded holes respectively. A clearance groove is provided on the side of the sliding block facing the main support for the limiting bolts to pass through.

[0008] Furthermore, the fixing block is provided with several first mounting channels, and the fixing block is provided with several third threaded holes communicating with the first mounting channels at one side of the first mounting channels. The third threaded holes are internally threaded with first fixing bolts. The sliding block is provided with several second mounting channels, and the sliding block is provided with several fourth threaded holes communicating with the second mounting channels at one side of the second mounting channels. The fourth threaded holes are internally threaded with second fixing bolts. Kirschner wires are inserted into the first and second mounting channels.

[0009] Furthermore, the control system includes a protection box, a drive board, a controller, and an infrared receiver. The controller is connected to both the drive board and the infrared receiver, and the drive board is connected to the stepper motor. The drive board, controller, and infrared receiver are all housed inside the protection box.

[0010] Furthermore, a mounting plate is provided on one end of the support rod, and the mounting plate is mounted on the stepper motor.

[0011] Furthermore, a support plate is provided at the end of the main bracket away from the support rod, a sliding block is located between the fixed block and the support plate, and the end of the threaded rod away from the stepper motor is rotatably mounted on the support plate.

[0012] Furthermore, the drive shaft of the stepper motor is connected to a threaded rod via a coupling.

[0013] Furthermore, the main support is made of aluminum alloy, while the sliding block and coupling are made of brass.

[0014] Compared with the prior art, the beneficial effects of this utility model are as follows: by combining the control system and the stepper motor to drive the sliding block to move, the precise displacement adjustment of the external fixation frame is realized, ensuring that the external fixation frame can stably and reliably perform micro-motion operations during the experiment, ensuring the efficiency, stability and operability of the external fixation frame in experimental research, and meeting the bone fixation needs in complex experimental environments. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of the rat bone external fixation frame of this utility model;

[0016] Figure 2 This is a partial schematic diagram of the rat bone external fixation frame of this utility model;

[0017] Figure 3 This is a schematic diagram showing the connection between the sliding block and the main support in the rat bone external fixation frame of this utility model;

[0018] Figure 4 This is a schematic diagram of the sliding block in the rat bone external fixation frame of this utility model;

[0019] Figure 5This is a schematic diagram showing the connection between the main support and the fixation block in the rat bone external fixation frame of this utility model;

[0020] Figure 6 This is a schematic diagram of the control system in the rat bone external fixation frame of this utility model.

[0021] In the diagram, 1-stepper motor, 2-threaded rod, 3-support rod, 31-mounting plate, 4-main bracket, 41-support plate, 5-sliding block, 51-sliding plate, 52-strip hole, 53-second fixing bolt, 54-second mounting channel, 55-fourth threaded hole, 56-clearance groove, 6-control system, 61-protection box, 62-drive board, 63-controller, 64-infrared receiver, 7-fixing block, 71-first fixing bolt, 72-first mounting channel, 73-third threaded hole, 8-Kirschner wire, 9-coupling, 10-limiting bolt. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0023] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0024] It should be noted that similar reference numerals and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. Furthermore, in the description of this utility model, terms such as "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0025] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0026] In the description of this utility model, it should be noted that the terms "upper", "lower", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship that the utility model product is usually placed in during use. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0027] Please see Figure 1 , Figure 2 and Figure 3 , Figure 1 This is a schematic diagram of the rat bone external fixation frame of this utility model. Figure 2 This is a partial schematic diagram of the rat bone external fixation frame of this utility model. Figure 3 This is a schematic diagram showing the connection between the sliding block and the main support in the rat external fixation frame of this utility model. A rat external fixation frame includes a stepper motor 1, a threaded rod 2, a support rod 3, a main support 4, a sliding block 5, and a control system 6. The drive shaft of the stepper motor 1 is connected to the threaded rod 2. One end of the main support 4 is provided with a fixing block 7, which has a first through hole penetrating both sides. One end of the support rod 3 is mounted on the stepper motor 1, and the other end of the support rod 3 is connected to the fixing block 7. The sliding block 5 is slidably disposed on the main support 4, and has a first threaded hole penetrating both sides. The threaded rod 2 passes through the first through hole and the first threaded hole, and is threadedly connected to the first threaded hole. The control system 6 is connected to the stepper motor 1. Both the fixing block 7 and the sliding block 5 are provided with Kirschner wires 8.

[0028] In use, the rat external fixation frame of this invention uses a fixing block 7 and a sliding block 5 to fix the skeleton of an SD rat via Kirschner wires 8. Then, based on the bone length and required micro-motion stimulation, a stepper motor 1 is driven by a control system 6. The drive shaft of the stepper motor 1 drives a threaded rod 2 to rotate. The sliding block 5 forms a helical pair with the threaded rod 2 through a first threaded hole and is slidably connected to the main support 4, restricting the rotation of the sliding block 5. This converts the rotation of the threaded rod 2 into axial movement of the sliding block 5 along the main support 4, achieving precise displacement adjustment of the sliding block 5. This ensures stable and reliable micro-motion operation during micro-motion osteogenic experiments, meeting the bone fixation requirements under complex experimental environments. The support rod 3, the main support 4, and the sliding block 5 constitute an anti-rotation limiting system, effectively preventing the sliding block 5 from rotating during movement and improving the linear motion stability and reliability of the sliding block 5. Furthermore, the modular design makes the assembly and disassembly of this rat external fixation frame more convenient, improving the maintainability and flexibility of the frame and enabling rapid adaptation to different experimental needs.

[0029] In one embodiment, the sliding block 5 is provided with a sliding groove, and the main support 4 passes through the sliding groove and is slidably connected to the sliding groove. The sliding groove cooperates with the main support 4, which makes it difficult to generate rotational shear force and effectively prevents the sliding block 5 from rotating during movement. It limits the displacement of the sliding block 5 during micro-movement, except for axial micro-movement, to ensure stability and reliability during the micro-movement osteogenic experiment.

[0030] In one embodiment, the rat external fixation frame of this invention further includes multiple limiting bolts 10. One end of the sliding block 5 is provided with a sliding plate 51 that contacts the side of the main support 4. The sliding plate 51 has a strip-shaped hole 52. The main support 4 has multiple second threaded holes spaced apart along the length of the strip-shaped hole 52. The multiple limiting bolts 10 pass through the strip-shaped hole 52 and are threaded into the multiple second threaded holes respectively. The sliding block 5 has a clearance groove 56 on the side facing the main support 4 for the limiting bolts 10 to pass through. By limiting the multiple limiting bolts 10 and the strip-shaped hole 52 on the sliding plate 51, rotation of the sliding block 5 during movement is further prevented, thereby further limiting the shear displacement of the rat external fixation frame of this invention. Through multi-dimensional and multi-structure limiting, the stability of the rat external fixation frame of this invention is ensured. The clearance groove 56 on the sliding block 5 allows the limiting bolts 10 to pass through, avoiding affecting the movement of the sliding block 5 along the length of the main support 4. In one embodiment, the fixing block 7 is provided with a plurality of first mounting channels 72, and the fixing block 7 is provided with a plurality of third threaded holes 73 communicating with the first mounting channels 72 on one side of the first mounting channels 72. A first fixing bolt 71 is internally threaded into each of the third threaded holes 73. The sliding block 5 is provided with a plurality of second mounting channels 54, and a plurality of fourth threaded holes 55 communicating with the second mounting channels 54 on one side of the sliding block 5. A second fixing bolt 53 is internally threaded into each of the fourth threaded holes 55. Kirschner wires 8 are inserted into the first mounting channels 72 and the second mounting channels 54. This arrangement facilitates the installation and removal of Kirschner wires 8. Further, the Kirschner wire 8 has a diameter of 1.5 mm and a thread length of 10 mm.

[0031] In one embodiment, the control system 6 includes a protective box 61, a drive board 62, a controller 63, and an infrared receiver 64. The controller 63 is connected to both the drive board 62 and the infrared receiver 64. The drive board 62 is connected to the stepper motor 1. The drive board 62, controller 63, and infrared receiver 64 are all housed within the protective box 61. The drive board 62 can be a DRV8825 drive board, connected to the stepper motor 1 via a two-phase four-wire interface. Combined with the controller 63, it enables high-precision micro-adjustment, ensuring the stability and accuracy of the rat external fixation frame of this invention, suitable for the skeletal fixation needs of small experimental animals such as rats. Furthermore, compatibility with other experimental equipment is considered, such as remote control via the infrared receiver 64, further expanding the application scenarios and experimental functions of the equipment. The stepper motor 1 is model 20HS2806A4.

[0032] In one embodiment, a mounting plate 31 is provided on one end of the support rod 3, and the mounting plate 31 is mounted on the stepper motor 1. The mounting plate 31 can be mounted on the stepper motor 1 by bolts, which facilitates the installation and removal of the support rod 3 on the stepper motor 1.

[0033] In one embodiment, a support plate 41 is provided at the end of the main bracket 4 away from the support rod 3, a sliding block 5 is located between the fixed block 7 and the support plate 41, and the end of the threaded rod 2 away from the stepper motor 1 is rotatably mounted on the support plate 41. The support plate 41 can support and limit the threaded rod 2.

[0034] In one embodiment, the drive shaft of the stepper motor 1 is connected to the threaded rod 2 via a coupling 9. The coupling 9 ensures that the drive shaft of the stepper motor 1 and the threaded rod 2 are coaxially connected, and that the drive shaft of the stepper motor 1 and the threaded rod 2 can rotate synchronously without relative slippage or lag. This allows for precise power transmission and stable displacement control, ensuring rapid and smooth response.

[0035] In one embodiment, the main support 4 is made of aluminum alloy, and the sliding block 5 and coupling 9 are made of brass. This design utilizes lightweight and high-strength materials, ensuring both the overall lightweight nature of the rat external fixation frame and sufficient mechanical strength and durability, thus guaranteeing stable performance during long-term use.

[0036] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Therefore, any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present utility model without departing from the content of the technical solution of the present utility model shall still fall within the scope of the technical solution of the present utility model.

Claims

1. A rat bone external fixation frame, characterized in that, The device includes a stepper motor, a threaded rod, a support rod, a main bracket, a sliding block, and a control system. The drive shaft of the stepper motor is connected to the threaded rod. One end of the main bracket is provided with a fixing block, and the fixing block has a first through hole penetrating both sides. One end of the support rod is mounted on the stepper motor, and the other end of the support rod is connected to the fixing block. The sliding block is slidably disposed on the main bracket, and the sliding block has a first threaded hole penetrating both sides. The threaded rod passes through the first through hole and the first threaded hole, and the threaded rod is threadedly connected to the first threaded hole. The control system is connected to the stepper motor. Both the fixing block and the sliding block are provided with Kirschner wires.

2. The rat external fixation frame according to claim 1, characterized in that, The sliding block is provided with a sliding groove, and the main bracket passes through the sliding groove and is slidably connected to the sliding groove.

3. The rat external fixation frame according to claim 2, characterized in that, It also includes multiple limiting bolts. One end of the sliding block is provided with a sliding plate that contacts the side of the main support. The sliding plate has a strip-shaped hole. The main support has multiple second threaded holes spaced apart along the length of the strip-shaped hole. The multiple limiting bolts pass through the strip-shaped hole and are threadedly connected to the multiple second threaded holes respectively. The sliding block has a clearance groove on the side facing the main support for the limiting bolts to pass through.

4. The rat external fixation frame according to claim 1, characterized in that, The fixing block is provided with a plurality of first mounting channels. The fixing block is provided with a plurality of third threaded holes communicating with the first mounting channels at one side of the first mounting channels. The third threaded holes are internally threaded with first fixing bolts. The sliding block is provided with a plurality of second mounting channels. The sliding block is provided with a plurality of fourth threaded holes communicating with the second mounting channels at one side of the second mounting channels. The fourth threaded holes are internally threaded with second fixing bolts. Kirschner wires are inserted into the first and second mounting channels.

5. The rat external fixation frame according to claim 1, characterized in that, The control system includes a protective box, a drive board, a controller, and an infrared receiver. The controller is connected to both the drive board and the infrared receiver. The drive board is connected to a stepper motor. The drive board, controller, and infrared receiver are all housed inside the protective box.

6. The rat external fixation frame according to claim 1, characterized in that, One end of the support rod is provided with a mounting plate, which is mounted on the stepper motor.

7. The rat external fixation frame according to claim 1, characterized in that, The main bracket has a support plate at the end away from the support rod, the sliding block is located between the fixed block and the support plate, and the threaded rod is rotatably mounted on the support plate at the end away from the stepper motor.

8. The rat external fixation frame according to claim 1, characterized in that, The drive shaft of the stepper motor is connected to a threaded rod via a coupling.

9. The rat external fixation frame according to claim 8, characterized in that, The main support is made of aluminum alloy, and the sliding block and coupling are made of brass.

Images