Internal fixation device for treating tibial plateau trailing edge fracture
By designing an internal fixing device including main nails, nuts, steel plates and torsion springs, the problem of insufficient strength of the traditional internal fixing device is solved, and a more stable fixation of the posterior edge of the tibia is achieved, which improves the effectiveness of the device.
Patent Information
- Application Number
- CN202420754234.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-12
- Publication Date
- 2025-05-27
- Estimated Expiration
- 2034-04-12
AI Technical Summary
Traditional internal fixation devices for treating fractures of the posterior edge of the tibial platform, such as sutures and steel plates, have insufficient fixation strength, which can easily lead to early loosening of the bone mass.
An internal fixing device is designed, including main nails, nuts, steel plates and torsion springs. Through the combination of main nails and nuts, the steel plate fixes the bone blocks, and the torsion springs and fixing grooves prevent the steel plate from deflecting back and forth, improving the fixing stability.
By setting up the mutual cooperation of the main nail, nut and steel plate, more stable fixation can be achieved at the fracture of the posterior edge of the tibia. The design of the torsion spring and fixing groove prevents the steel plate from deflecting, improving the effectiveness of the device.
Smart Images
Figure CN222899255U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of orthopedic instruments, and particularly relates to an internal fixation device for treating posterior tibial plateau fractures. Background Technique
[0002] Most of the posterior tibial plateau fractures are avulsion fractures of the posterior cruciate ligament insertion point. Since the fracture location is behind the knee joint, and there are a large number of important blood vessels and nerves behind the knee joint, it causes great difficulties in the fixation after fracture reduction. Traditional open surgery requires a large surgical incision behind the knee joint, retracting the blood vessels and nerves, and then using ordinary screws for fixation. This not only has a large incision but also easily causes damage to blood vessels and nerves, leading to major surgical safety accidents. With the development of minimally invasive technology to date, many scholars have begun to use arthroscopic minimally invasive surgery to treat posterior tibial plateau fractures. After observing and reducing under the arthroscope, a guide pin is inserted by a locator and then fixed by suture ligation or loop plate fixation. However, whether it is a suture or a loop, the fixation strength is lacking, and even early loosening of the bone block may occur.
[0003] Therefore, we propose an internal fixation device for treating posterior tibial plateau fractures to facilitate solving the problems mentioned above. Content of the Utility Model
[0004] The purpose of the utility model is to provide an internal fixation device for treating posterior tibial plateau fractures to solve the problem that whether it is a suture or a loop, the fixation strength is lacking, and even early loosening of the bone block may occur as mentioned in the above background technique.
[0005] To achieve the above purpose, the utility model provides the following technical solution: An internal fixation device for treating posterior tibial plateau fractures, including a main nail. A receiving groove is opened at a position close to the top on one side of the main nail. External threads are opened at a position close to the bottom on the outer periphery of the main nail. A nut is threadedly installed on the outer periphery of the main nail close to the bottom. Rectangular blocks are fixedly installed at positions close to the front and rear sides at the top of the inner cavity of the receiving groove. Connecting shafts are fixedly installed at positions close to the bottom on the opposite sides of the rectangular blocks. The opposite ends of the connecting shafts are jointly rotatably connected to a steel plate.
[0006] Preferably, a fixing groove is fixedly installed at a position close to the bottom on the rear side of the rectangular block on the front side, and the rear end of the connecting shaft movably penetrates through the inner cavity of the fixing groove. A torsion spring is movably sleeved on the outer periphery of the connecting shaft on the front side, and the front end of the torsion spring is fixedly connected to the adjacent rectangular block, and the rear end of the torsion spring is fixedly connected to the adjacent connecting shaft.
[0007] Preferably, a baffle is fixedly installed at a position close to one side at the top of the inner cavity of the receiving groove, and the baffle is arranged in mutual fit with the steel plate.
[0008] Preferably, the length and diameter of the main nail are 70 mm and 3.2 mm respectively.
[0009] Preferably, the length of the external thread is 40 mm.
[0010] Preferably, the length of the steel plate is 8 mm.
[0011] Compared with the prior art, the beneficial effects of the present utility model are as follows:
[0012] By setting the cooperation of components such as the main nail, nut and steel plate, the fracture at the posterior edge of the tibia can be stably fixed. And by setting the torsion spring and the fixing groove, the steel plate can be prevented from deflecting back and forth, which affects the installation efficiency of the main nail. And by setting the baffle plate, the excessive flipping of the steel plate can be hindered, improving the use effect of the device. Description of the Drawings
[0013] Figure 1 is a schematic diagram of the overall structure of the present utility model;
[0014] Figure 2 is an exploded view of the main nail and nut of the present utility model;
[0015] Figure 3 is a partial three-dimensional structure schematic diagram of the main nail, steel plate and storage groove of the present utility model;
[0016] Figure 4 is a partial exploded view of the main nail, steel plate and storage groove of the present utility model;
[0017] Figure 5 is an unfolded view of the main nail, steel plate and storage groove of the present utility model;
[0018] Figure 6 is of the present utility model Figure 4 Enlarged view at A in.
[0019] In the figure: 1, main nail; 2, nut; 3, external thread; 4, storage groove; 5, rectangular block; 6, connecting shaft; 7, steel plate; 8, fixing groove; 9, torsion spring; 10, baffle plate. Detailed Embodiments
[0020] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. Based on the embodiments in the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.
[0021] Embodiment 1: Please refer to Figures 1-6, An internal fixation device for treating fractures of the posterior margin of the tibial plateau, including a main nail 1. A receiving groove 4 is provided near the top on one side of the main nail 1, and the receiving groove 4 can be used to receive the steel plate 7. An external thread 3 is provided near the bottom on the outer periphery of the main nail 1, and a nut 2 is threadedly installed on the outer periphery of the main nail 1 near the bottom. Rectangular blocks 5 are fixedly installed near the front and rear sides at the top of the inner cavity of the receiving groove 4. Connecting shafts 6 are fixedly installed near the bottom on the opposite sides of the rectangular blocks 5. The opposite ends of the connecting shafts 6 are jointly rotatably connected to the steel plate 7. By setting the cooperation of the nut 2, the main nail 1 and the external thread 3, the bone block can be stably fixed through the steel plate 7.
[0022] The length and diameter of the main nail 1 are 70 mm and 3.2 mm respectively.
[0023] The length of the external thread 3 is 40 mm.
[0024] The length of the steel plate 7 is 8 mm.
[0025] Embodiment 2: This embodiment is an improvement made on the basis of Embodiment 1. Specifically, please refer to Figures 1-6 , A fixing groove 8 is fixedly installed near the bottom at the rear side of the front rectangular block 5, and the rear end of the connecting shaft 6 movably penetrates through the inner cavity of the fixing groove 8. A torsion spring 9 is movably sleeved on the outer periphery of the front connecting shaft 6, and the front end of the torsion spring 9 is fixedly connected to the adjacent rectangular block 5, and the rear end of the torsion spring 9 is fixedly connected to the adjacent connecting shaft 6. Under the action of the torsion spring 9, the steel plate 7 can be restricted through the connecting shaft 6, preventing the steel plate 7 from deflecting back and forth when installing the main nail 1 and affecting the installation efficiency of the main nail 1.
[0026] A baffle 10 is fixedly installed near one side at the top of the inner cavity of the receiving groove 4, and the baffle 10 is arranged in mutual fit with the steel plate 7. Under the obstruction of the baffle 10, the steel plate 7 can be prevented from turning over too much, improving the effect of fixing the bone block.
[0027] Working principle: During the operation, a hole is pre-drilled at the posterior margin fracture position using an external tool, and the hole diameter is slightly larger than 3.2 mm. The main nail 1 is penetrated through the inner cavity of the drilled hole, and the steel plate 7 is flipped. Under the obstruction of the baffle 10, the steel plate 7 can be prevented from turning over too much, improving the effect of fixing the bone block. Then, the nut 2 is threadedly connected to the outer periphery of the main nail 1 to improve the fixing effect of the steel plate 7 on the bone block. When the steel plate 7 is firmly fixed, the redundant main nail 1 can be removed by an external clamp. By setting the torsion spring 9 and the fixing groove 8, it can be prevented that when installing the main nail 1, the steel plate 7 deflects back and forth and affects the installation efficiency of the main nail 1, improving the use effect of the device.
[0028] The content not described in detail in this specification belongs to the well-known prior art of those skilled in the art.
[0029] 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 perform equivalent replacements on some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.
Claims
1. An internal fixation device for treating posterior edge fracture of tibial plateau, comprising a main nail (1), characterized in that: A receiving groove (4) is provided on one side of the main nail (1) near the top, an external thread (3) is provided on the outer periphery of the main nail (1) near the bottom, a nut (2) is threadedly mounted on the outer periphery of the main nail (1) near the bottom, a rectangular block (5) is fixedly mounted on the top of the inner cavity of the receiving groove (4) near the front and rear sides, a connecting shaft (6) is fixedly mounted on the opposite side of the rectangular block (5) near the bottom, and a steel plate (7) is rotatably connected to the opposite end of the connecting shaft (6).
2. An internal fixation device for treating posterior edge fracture of tibial plateau according to claim 1, characterized in that: A fixing groove (8) is fixedly installed near the bottom of the rear side of the rectangular block (5) located on the front side, and the rear end of the connecting shaft (6) movably penetrates the inner cavity of the fixing groove (8). A torsion spring (9) is movably sleeved on the periphery of the connecting shaft (6) located on the front side, and the front end of the torsion spring (9) is fixedly connected to the adjacent rectangular block (5), and the rear end of the torsion spring (9) is fixedly connected to the adjacent connecting shaft (6).
3. The internal fixation device for treating posterior edge fracture of tibial plateau according to claim 1, characterized in that: A baffle plate (10) is fixedly mounted near one side of the inner cavity top of the storage groove (4), and the baffle plate (10) and the steel plate (7) are arranged to fit each other.
4. The internal fixation device for treating posterior edge fracture of tibial plateau according to claim 1, characterized in that: The length and diameter of the main nail (1) are 70 mm and 3.2 mm respectively.
5. The internal fixation device for treating posterior edge fracture of tibial plateau according to claim 1, characterized in that: The length of the external thread (3) is 40 mm.
6. The internal fixation device for treating posterior edge fracture of tibial plateau according to claim 1, characterized in that: The length of the steel plate (7) is 8 mm.