Dynamic compression locking bone screw
By designing a split nail cap structure and clutch combination in the locking bone screw, the torque control is achieved, and the problem of excessive torque during manual tightening is solved, which leads to damage to the screw, improving the convenience of surgical operation.
Patent Information
- Application Number
- CN202421035711.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-14
- Publication Date
- 2025-03-07
- Estimated Expiration
- 2034-05-14
AI Technical Summary
When using locking bone screws for fracture treatment, manual tightening process is prone to damage the screw thread due to excessive torque, and the operation is cumbersome and there is a lack of convenient solutions.
A dynamic pressurized locking bone screw is designed. By setting the nail cap apart as a connecting part and a locking part, and using the combination of clutch moving block, fixed block and butterfly reed, it can effectively control the torque and avoid screw damage caused by excessive torque.
It effectively prevents the screw thread from being damaged due to excessive torque during manual tightening, and does not need to replace the manual screw handle, which significantly improves the convenience of surgical operation.
Smart Images
Figure CN222565922U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of medical devices, and in particular relates to a dynamic pressurized locking bone screw. Background Art
[0002] Locking bone screws are passive implant devices used for fracture treatment, featuring high strength, adjustability, low trauma, and long-term stability. There are a variety of types to choose from, depending on the type of fracture and the patient's specific situation. During fracture treatment, dynamic compression plates and locking bone screws are often used together. The doctor will use locking bone screws to stabilize the fracture site, and then use dynamic compression plates to apply appropriate pressure to the fracture site. In this way, the plate and screws work together to provide the best environment and conditions for fracture healing.
[0003] The locking bone screw has a unique structure, with threads on the cap, while the screw is thicker and has shallower threads. The threads on the cap match the threads at the bone plate connection hole to ensure a stable connection; while the threads on the screw match the threaded holes pre-opened in the broken bone to achieve precise fixation. In view of the long thread stroke of the screw, an electric power device is usually used for tightening to ensure smooth screwing. However, in order to avoid damage to the screw threads due to excessive torque applied by the power device, a torque handle is usually used for manual tightening in the final stage. Although this ensures safety, the operation process is relatively cumbersome, so the utility model proposes a dynamic pressurized locking bone screw to avoid the risk of damage to the screw threads due to excessive torque during manual tightening. At the same time, there is no need to replace the manual screwdriver handle, thereby improving the convenience of surgical operations.
[0004] Currently, no effective solution has been proposed for the problems in the related technologies. Utility Model Content
[0005] To achieve the above-mentioned objectives, the utility model provides the following technical solutions: a dynamic pressure locking bone screw, comprising a nail cap structure and a nail rod, the nail cap structure comprising a connecting part and a locking part, the connecting part is connected to the nail rod at the center of the bottom, an installation cavity is opened inside the connecting part, a clutch fixed block is evenly connected to the top of the installation cavity, a screwdriver groove is opened at the center of the top end surface of the locking part, a connecting rod is connected to the center of the bottom of the locking part, a baffle is connected to the bottom end of the connecting rod, a butterfly spring is installed between the baffle and the inner wall of the installation cavity, the connecting rod shaft passes through the top of the installation cavity, the butterfly spring and the baffle are placed at the bottom of the installation cavity, the locking part is located at the outer edge of the connecting rod and is evenly connected to the clutch moving block, and the clutch fixed block and the clutch moving block are adapted.
[0006] As a preferred technical solution of the utility model, the clutch fixed block and the clutch movable block are both arranged in a circle.
[0007] As a preferred technical solution of the utility model, the connecting portion and the outer wall of the nail rod are both provided with external threads.
[0008] As a preferred technical solution of the present utility model, the connecting portion, the nail rod and the clutch stator are an integrally formed structure.
[0009] As a preferred technical solution of the present utility model, the locking portion, the connecting rod and the baffle are an integrally formed structure.
[0010] Compared with the prior art, the beneficial effects of the utility model are as follows: the utility model realizes effective control of torque by separately setting the nail nut as a connecting part and a locking part, and by cleverly using the combination of the clutch movable block, the fixed block and the butterfly spring leaf. When the torque applied to the screw exceeds the preset value, the inclined surface of the clutch movable block will slip off the inclined surface of the clutch fixed block, thereby effectively preventing the screw from being further tightened. This not only avoids the risk of damaging the screw thread due to excessive torque during the manual tightening process, but also eliminates the need to replace the manual screwdriver handle, significantly improving the convenience of surgical operations. BRIEF DESCRIPTION OF THE DRAWINGS
[0011] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:
[0012] Figure 1 It is a schematic diagram of the overall structure of the utility model;
[0013] Figure 2 It is a schematic diagram of the cross-sectional structure of the connecting part and the locking part in the utility model;
[0014] In the figure: 1. nail rod; 2. connecting part; 3. locking part; 4. installation cavity; 5. clutch fixed block; 6. screwdriver groove; 7. connecting rod; 8. baffle; 9. butterfly spring; 10. clutch moving block; 11. external thread. DETAILED DESCRIPTION
[0015] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0016] Example
[0017] See also Figure 1-2The utility model provides the following technical solutions: a dynamic pressure locking bone screw, which is mainly composed of a screw cap structure and a screw rod 1; wherein the screw cap structure is responsible for connecting with a screwdriver and an electric power device, and the screw rod 1 is responsible for implanting the broken bone to achieve bone fixation and repair; the screw cap structure includes a connecting portion 2 and a locking portion 3; the bottom center of the connecting portion 2 is closely connected to the screw rod 1, and the connecting portion 2 has an installation cavity 4 therein; the top of the installation cavity 4 is evenly distributed with clutch fixed blocks 5 for cooperating with a clutch moving block 10; a screwdriver groove 6 is provided at the center of the top end surface of the locking portion 3 for cooperating with the screwdriver; the bottom center of the locking portion 3 is connected with Connecting rod 7, the bottom end of connecting rod 7 is connected with baffle 8; butterfly spring 9 is installed between baffle 8 and the inner wall of mounting cavity 4 to provide necessary elasticity and restoring force, and abut the inclined surface of clutch movable block 10 against the inclined surface of clutch fixed block 5; the connecting rod 7 rod body passes through the top of mounting cavity 4, and butterfly spring 9 and baffle 8 are placed at the bottom of mounting cavity 4, which are used for connecting connecting part 2 and locking part 3; on the outer edge of locking part 3, clutch movable blocks 10 are evenly distributed, and these clutch movable blocks 10 are matched with clutch fixed block 5 to form a clutch structure together; clutch fixed block 5 and clutch movable block 10 are both distributed in a circle to ensure the stability and reliability of bone screw during dynamic pressurization.
[0018] In order to facilitate the connection and fastening with the threaded hole pre-drilled in the broken bone, in this embodiment, as a preferred technical solution of the utility model, the outer wall of the connecting part 2 and the nail rod 1 are both provided with external threads 11.
[0019] In order to ensure the overall strength of the screw, in this embodiment, as a preferred technical solution of the utility model, the connecting part 2, the nail rod 1 and the clutch stator 5 are an integrally formed structure, and the locking part 3, the connecting rod 7 and the baffle 8 are an integrally formed structure.
[0020] In summary, with the aid of the above technical scheme of the utility model, when in use, a screw hole is opened in advance at the broken bone, and then the output head of the electric power device is connected to the tail end of the screwdriver head, and one end of the screwdriver head is embedded in the screwdriver groove 6 of the locking part 3, and the locking part 3 is rotated by the output of the electric power device, and then the screwdriver head is driven to rotate through the output of the electric power device. When the locking part 3 is subjected to force, the clutch movable block 10 at the bottom abuts against the inner wall of the installation cavity 4 and the baffle 8 on both sides of the butterfly spring 9, and then the inclined surface of the clutch movable block 10 abuts against the inclined surface of the clutch fixed block 5. When the electric power device drives the locking part 3 to rotate with the aid of the screwdriver head, since the threaded hole has been opened in advance at the broken bone, the resistance when the nail rod 1 is drilled into the threaded hole is reduced. The force is small, so that the locking part 3 can drive the connecting part 2 and the nail rod 1 to rotate, so that the nail rod 1 is threadedly connected with the help of the external thread 11 and the screw hole pre-opened at the broken bone. When the external thread 11 of the nail rod 1 gradually rotates to the end point, the resistance will increase, and the torque output by the screwdriver head will continue to screw the locking part 3 with the help of the screwdriver head. At this time, since the torque cannot be transmitted downward, the force is concentrated on the adjacent inclined surfaces of the clutch movable block 10 and the clutch fixed block 5. Since the inclined surfaces between the clutch movable block 10 and the clutch fixed block 5 are in contact with each other, when the force is large here, the adjacent inclined surface of the clutch movable block 10 will slip off the inclined surface of the clutch fixed block 5, and the purpose of continuing to tighten the nail rod 1 cannot be achieved, thereby preventing damage to the thread.
[0021] Finally, it should be noted that in the present utility model, unless otherwise clearly stipulated and limited, terms such as "installation", "setting", "connection", "fixation", and "screw-on" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. Unless otherwise clearly defined, ordinary technicians in this field can understand the specific meanings of the above terms in the utility model according to the specific circumstances.
[0022] The above description is only a preferred embodiment of the utility model and is not intended to limit the utility model. Although the utility model is described in detail with reference to the above embodiments, those skilled in the art can still modify the technical solutions recorded in the above embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.
Claims
1. A dynamic compression locking bone screw, comprising a screw cap structure and a screw rod (1), characterized in that: The nail cap structure comprises a connecting portion (2) and a locking portion (3). The center of the bottom of the connecting portion (2) is connected to the nail rod (1). An installation cavity (4) is provided inside the connecting portion (2). A clutch fixed block (5) is evenly connected to the top of the installation cavity (4). A screwdriver groove (6) is provided at the center of the top end surface of the locking portion (3). A connecting rod (7) is connected to the center of the bottom of the locking portion (3). A baffle plate (8) is connected to the bottom end of the connecting rod (7). A butterfly spring (9) is installed between the baffle plate (8) and the inner wall of the installation cavity (4). The connecting rod (7) has a rod body that passes through the top of the installation cavity (4). The butterfly spring (9) and the baffle plate (8) are placed at the bottom of the installation cavity (4). The locking portion (3) is evenly connected to a clutch movable block (10) at the outer edge of the connecting rod (7). The clutch fixed block (5) and the clutch movable block (10) are matched.
2. A dynamic compression locking bone screw according to claim 1, characterized in that: The clutch fixed block (5) and the clutch movable block (10) are both arranged in a circle.
3. The dynamic compression locking bone screw according to claim 1, characterized in that: The connecting portion (2) and the outer wall of the nail rod (1) are both provided with external threads (11).
4. The dynamic compression locking bone screw according to claim 1, characterized in that: The connecting portion (2), the nail rod (1) and the clutch stator (5) are an integrally formed structure.
5. The dynamic compression locking bone screw according to claim 1, characterized in that: The locking portion (3), the connecting rod (7) and the baffle plate (8) are an integrally formed structure.