An interlocking screw

Abstract

The application relates to an interlocking screw, belonging to the technical field of medical instruments, which comprises a nail body and a lock, a plurality of bolt holes are formed in the end of the nail body facing the lock, a plurality of pin bodies which are adapted to be inserted into the bolt holes are fixed on the side of the lock facing the nail body, a single thread is formed on the circumferential side wall of the nail body, and a double thread is formed on the circumferential side wall of the end of the nail body close to the lock. The application has the effects of improving the stability of the connection between the inserter and the skeleton and reducing the operation difficulty.

Description

Technical Field

[0001] This application relates to the technical field of medical devices, and in particular to an interlocking screw. Background Technology

[0002] For athletes and manual laborers, ligament injuries and even ligament ruptures are inevitable. Therefore, various methods are needed to repair or even reconstruct tendons and ligaments to restore normal motor function.

[0003] Currently, many related products have emerged on the market, including ultra-high molecular weight polyethylene sutures and inserters. The ultra-high molecular weight polyethylene sutures are connected and fixed to the inserter, and then the inserter is fixed to the human skeleton using products such as suture anchors, looped titanium plates, interface nails, and U-shaped nails. Finally, the ligament rupture is sutured using ultra-high molecular weight polyethylene sutures. These products meet most surgical needs.

[0004] However, during the surgery, products such as suture anchors, looped titanium plates, interface nails, and U-shaped nails are prone to loosening and slippage when connecting and fixing the inserter to the bone, which increases the difficulty of the surgery. Summary of the Invention

[0005] To improve the stability of the connection and fixation between the inserter and the bone, and to reduce the difficulty of the operation, this application provides an interlocking screw.

[0006] The interlocking screw provided in this application adopts the following technical solution:

[0007] An interlocking screw includes a screw body and a locking device. The screw body has multiple pin holes at one end facing the locking device. The locking device has multiple pins that are adapted to be inserted into the pin holes on one side facing the screw body. The circumferential sidewall of the screw body is machined with a single-threaded thread, and the circumferential sidewall of the screw body near the locking device is machined with a double-threaded thread.

[0008] By adopting the above technical solution, the nail body is first fixed to the human bone. The single-threaded design facilitates the gradual screwing of the nail body into the bone, while the double-threaded design increases the connection strength between the nail body and the bone, making it less likely for the nail body to loosen. Then, the inserter is placed inside the nail body, and a locking device is fastened to the top of the nail body. The pin is inserted into the pin hole, forming a tenon-and-mortise connection between the locking device and the nail body. The locking device improves the stability of the inserter inside the nail body, and the tenon-and-mortise connection improves the stability between the nail body and the locking device. This effectively improves the stability of the connection and fixation between the inserter and the bone, and reduces the difficulty of the surgery.

[0009] Optionally, the side wall of the nail body is provided with a through hole, and the locking device is provided with a through hole.

[0010] By adopting the above technical solution, after the nail body and the locking device are fixed, the ultra-high molecular weight polyethylene suture is passed through the suture hole through the locking device in sequence, and then through the suture hole through the nail body, which facilitates the binding work of the staff.

[0011] Optionally, the length of the double-threaded section in the axial direction of the circumferential sidewall of the pin body is equal to the length of the pin body.

[0012] Optionally, the sidewall of the pin is provided with a plurality of barbs.

[0013] By adopting the above technical solution, the barbed structure creates an interference fit between the locking device and the skeleton, improving the stability of the connection between the locking device and the skeleton and making the locking device less likely to fall off.

[0014] Optionally, the top of the nail body is provided with a square hole, which is adapted to be inserted into the inserter.

[0015] By adopting the above technical solution, the inserter is placed in the square hole, so that the inserter is engaged with the nail body, thereby improving the stability between the nail body and the inserter.

[0016] Optionally, the diameter of the locking device gradually increases from bottom to top, and the minimum diameter of the locking device is greater than the diameter of the top of the nail body.

[0017] By adopting the above technical solution, when the locking device and the nail body are connected, as the locking device moves towards the nail body, the locking device can gradually fit more closely with the bone, further improving the stability of the connection between the locking device and the bone.

[0018] Optionally, a reinforcement structure for reinforcing the nail body and the locking device is provided between the nail body and the pin body. The reinforcement structure includes a trigger rod and a insertion rod. The trigger rod is fixedly connected to the bottom wall of the nail body at the insertion pin hole. The bottom of the pin body has a trigger hole for inserting the trigger rod. The side wall of the pin body has a first receiving hole. The insertion rod is located in the first receiving hole and is slidably connected to the pin body. The first receiving hole and the trigger hole are connected. The first receiving hole penetrates the inner side wall of the pin body. A first fixing block is fixedly provided on the side wall of the insertion rod. A first spring is fixedly connected between the first fixing block and the inner wall of the pin body at the first receiving hole. The side wall of the nail body has an insertion hole adapted to the insertion rod. The inside of the nail body is provided with a snap-fit ​​assembly adapted to the snap-fit ​​of the insertion rod.

[0019] By adopting the above technical solution, when the locking device is installed above the nail body, the trigger rod is inserted into the trigger hole. The trigger rod drives the insert rod to move outward from the first receiving hole. At this time, the first spring is gradually stretched and drives the insert rod to be inserted into the insertion hole. The locking component is locked and fixed with the insert rod, thereby improving the stability of the connection and fixation between the locking device and the nail body.

[0020] Optionally, the nail body has second storage holes on both sides of the insertion hole, and the snap-fit ​​assembly is located in the second storage holes. The snap-fit ​​assembly includes a snap-fit ​​block and a snap-fit ​​spring. The snap-fit ​​spring is fixedly connected between the snap-fit ​​block and the nail body, and the side wall of the insertion rod has a snap-fit ​​hole that is adapted to snap-fit ​​the snap-fit ​​block.

[0021] By adopting the above technical solution, when the plug is inserted into the socket, the plug causes the locking block to gradually retract into the second storage hole. When the plug moves to the point where the second storage hole and the locking hole are aligned, the locking spring will spring the locking block into the locking hole, thereby fixing the plug in the socket.

[0022] Optionally, the nail body has a movable groove above the insertion hole, the bottom of the movable groove is connected to the insertion hole, the top of the movable groove penetrates the top wall of the nail body, a locking rod is provided in the movable groove, the locking rod is slidably connected to the nail body, a pair of locking plates are hinged to the top of the locking rod, the two locking plates are arranged opposite each other, a torsion spring is installed between the locking plates and the locking rod, and a locking hole is provided at the bottom of the locking device for the locking rod and the locking plates to be inserted.

[0023] By adopting the above technical solution, when the insert rod is inserted into the insertion hole, it drives the locking rod to move into the locking hole in the movable groove. When the insert rod is fully inserted into the insertion hole, the insert rod drives the locking rod to move in the direction of the locking hole, so that the end of the locking rod and the locking plate are inserted into the locking hole. When the locking plate enters the locking hole, the torsion spring drives the locking plate to open to both sides of the locking rod, thereby realizing the locking rod and the locking device to be locked together.

[0024] Optionally, a second fixing block is fixedly provided on the side wall of the locking rod, and a second spring is fixedly connected to the inner wall between the second fixing block and the nail body in the movable groove.

[0025] By adopting the above technical solution, when the plug rod is not inserted into the socket, the second spring can keep the locking rod in the movable groove, making it difficult for the locking rod to slide out of the movable groove. When the plug rod is inserted into the socket, the second spring is in a stretched state after the end of the locking rod is moved out of the movable groove.

[0026] In summary, this application includes at least one of the following beneficial technical effects:

[0027] 1. The circumferential sidewalls of the nail body are machined with single-thread and double-thread, thereby improving the fixation effect between the nail body and the bone;

[0028] 2. A snap-fit ​​assembly is added between the nail body and the locking device, thereby improving the stability of the connection between the two;

[0029] 3. Add a locking rod and a locking plate between the nail body and the locking device to further improve the stability of the connection between the two. Attached Figure Description

[0030] Figure 1This is a schematic diagram of the structure of an interlocking screw according to an embodiment of this application;

[0031] Figure 2 This is an exploded view of the nail body and the locking device in the embodiments of this application;

[0032] Figure 3 This is a partial sectional view of the side of the embodiment of the present application to illustrate the reinforced structure;

[0033] Figure 4 This is a top partial sectional view of the snap-fit ​​assembly structure in an embodiment of this application.

[0034] In the diagram, 1. Nail body; 11. Insertion hole; 12. Single-threaded thread; 13. Double-threaded thread; 14. Wire hole; 15. Square hole; 16. Insertion hole; 17. Movable groove; 2. Locking device; 21. Pin body; 211. Trigger hole; 212. First storage hole; 22. Wire passage hole; 23. Barb; 24. Locking hole; 3. Reinforcing structure; 31. Trigger rod; 32. Insertion rod; 321. Snap-fit ​​hole; 33. First spring; 331. First fixing block; 4. Snap-fit ​​assembly; 41. Snap-fit ​​block; 42. Snap-fit ​​spring; 5. Second storage hole; 6. Locking rod; 61. Locking plate; 62. Torsion spring; 7. Second fixing block; 71. Second spring. Detailed Implementation

[0035] The following is in conjunction with the appendix Figure 1-4 This application will be described in further detail.

[0036] This application discloses an interlocking screw.

[0037] refer to Figure 1 and Figure 2 An interlocking screw includes a screw body 1 and a locking device 2. The tip of the screw body 1 faces downward, and the locking device 2 is located above the screw body 1, with its radius gradually increasing from bottom to top. The circumferential sidewall of the screw body 1 has a single-threaded thread 12 and a double-threaded thread 13 from bottom to top, with the double-threaded thread 13 located on the circumferential sidewall near the top of the screw body 1. The screw body 1 is screwed into the human bone, and an inserter is placed inside the screw body 1. The locking device 2 is then fixed above the screw body 1 to protect the inserter. Ultra-high molecular weight polyethylene sutures are then passed through the locking device 2 into the screw body 1 to connect with the inserter, and then exit from the screw body 1. The single-threaded thread 12 facilitates the gradual screwing of the screw body 1 into the bone, while the double-threaded thread 13 increases the friction between the screw body 1 and the bone, improving the stability of the screw body 1.

[0038] The top circumferential sidewall of the nail body 1 is uniformly provided with multiple pin holes 11 along the length of the nail body 1. In this embodiment, four pin holes 11 are preferably provided. The bottom of the locking device 2 is provided with multiple pins 21, which are inserted into and matched with the pin holes 11 one by one. The locking device 2 and the pins 21 are integrally formed. The outer wall of each pin 21 is provided with barbs 23. In this embodiment, three barbs 23 are provided on each pin 21. The diameter of the locking device 2 gradually increases from bottom to top. The diameter of the largest part of the locking device 2 is greater than the diameter of the largest part of the nail body 1. In this embodiment, the diameter of the smallest part of the locking device 2 is 7 mm, and the diameter of the top of the nail body 1 is 6.5 mm.

[0039] A threading hole 14 is provided through the side wall near the bottom of the nail body 1. A square hole 15 for placing the inserter is provided at the top of the nail body 1. The square hole 15 communicates with the threading hole 14. A thread-passing hole 22 is provided through the locking device 2. The thread-passing hole 22 communicates with the square hole 15. The ultra-high molecular weight polyethylene suture is passed through the locking device 2 through the thread-passing hole 22 and connected and fixed to the inserter at the square hole 15. Then the ultra-high molecular weight polyethylene suture is passed out from the inside of the nail body 1 through the threading hole 14.

[0040] Reference Figure 3 and Figure 4 A reinforcing structure 3 for reinforcing the nail body 1 and the locking device 2 is provided between the pin body 21 and the pin hole 11. The reinforcing structure 3 includes a trigger rod 31, a insertion rod 32, and a first spring 33. The bottom of the locking device 2 has a trigger hole 211 for inserting the trigger rod 31. The trigger rod 31 is fixedly connected to the bottom wall of the nail body 1 at the pin hole 11. The inner side wall of the pin body 21 has a first receiving hole 212. The insertion rod 32 is located in the first receiving hole 212. The side wall of the nail body 1 at the pin hole 11... A socket 16 is provided to fit the insertion rod 32. A first fixing block 331 is fixed to the circumferential side wall of the insertion rod 32. Two first springs 33 are provided, located on both sides of the trigger rod 31. The two ends of the first springs 33 are fixedly connected to the first fixing block 331 and the pin 21 at the inner wall of the first receiving hole 212, respectively. The trigger hole 211 is connected to the first receiving hole 212. A snap-fit ​​assembly 4 is provided inside the nail body 1 to snap and fix the insertion rod 32. When the locking device 2 is fastened above the nail body 1, the trigger rod 31 is inserted into the trigger hole 211 and drives the insertion rod 32 to be inserted into the socket 16. At this time, the first spring 33 is in a stretched state. After the insertion rod 32 moves into the socket 16, the snap-fit ​​assembly 4 snaps and fixes the insertion rod 32, thereby further improving the stability of the connection and fixation between the locking device 2 and the nail body 1.

[0041] The nail body 1 has second receiving holes 5 on both sides of the insertion hole 16, which are connected to the insertion hole 16. The snap-fit ​​assembly 4 is disposed in the second receiving hole 5. The snap-fit ​​assembly 4 includes a snap-fit ​​block 41 and a snap-fit ​​spring 42. The side wall of the insertion rod 32 has a snap-fit ​​hole 321 that is adapted to snap-fit ​​the snap-fit ​​block 41. The snap-fit ​​spring 42 is fixedly connected between the snap-fit ​​block 41 and the nail body 1. When the insertion rod 32 is inserted into the insertion hole 16, and when the snap-fit ​​hole 321 is aligned with the second receiving hole 5, the snap-fit ​​spring 42 pops the snap-fit ​​block 41 out of the second receiving hole 5, so that the snap-fit ​​block 41 is snapped into the snap-fit ​​hole 321, thereby fixing the insertion rod 32 in the insertion hole 16, realizing the connection and fixation between the nail body 1 and the insertion rod 32.

[0042] The top of the nail body 1 has a movable groove 17, the top of which penetrates the top wall of the nail body 1, and the bottom of which is connected to the insertion hole 16. A locking rod 6 is provided in the movable groove 17. Second fixing blocks 7 are fixed on both sides of the locking rod 6. A second spring 71 is fixedly connected between the second fixing blocks 7 and the nail body 1. A pair of locking plates 61 are hinged to the top of the locking rod 6. The two locking plates 61 are arranged opposite each other on both sides of the locking rod 6. A torsion spring 62 is installed at the hinge of the locking plates 61 and the locking rod 6. The bottom of the locking device 2 has a locking hole 24 that is adapted to engage with the locking plates 61. When the insertion rod 32 is inserted into the insertion hole 16, the insertion rod 32 drives the locking rod 6 to move into the locking hole 24. After the locking plate 61 moves into the locking hole 24, the torsion spring 62 springs the locking plate 61 open so that the locking plate 61 is locked in the locking hole 24. At this time, the second spring 71 is in a stretched state, thereby realizing the fixation between the locking rod 6 and the locking device 2, and further improving the stability of the connection and fixation between the locking device 2 and the nail body 1.

[0043] The implementation principle of an interlocking screw according to an embodiment of this application is as follows: First, the screw body 1 is screwed into the human bone. Then, the inserter is placed into the square hole 15. Next, the locking device 2 is fastened above the screw body 1 to fix the locking device 2 and the screw body 1. Finally, ultra-high molecular weight polyethylene suture is passed through the locking device 2 through the thread hole 14 and through the screw body 1 through the thread hole 22. The double thread 13 improves the stability of the connection and fixation between the screw body 1 and the bone; the square hole 15 improves the stability within the screw body 1; and the reinforcement structure 3 and the locking plate 61 improve the stability of the connection and fixation between the locking device 2 and the screw body 1.

[0044] The embodiments described in this specific implementation are preferred embodiments of this application and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. An interlocking screw, characterized in that: It includes a nail body (1) and a locking device (2). The nail body (1) has multiple pin holes (11) at one end facing the locking device (2). The locking device (2) has multiple pins (21) that are compatible with the pin holes (11) fixed on one side facing the nail body (1). The circumferential sidewall of the nail body (1) is machined with a single thread (12), and the circumferential sidewall of the nail body (1) near the locking device (2) is machined with a double thread (13). A reinforcement structure (3) for reinforcing the nail body (1) and the locking device (2) is provided between the nail body (1) and the pin body (21). The reinforcement structure (3) includes a trigger rod (31) and a insertion rod (32). The trigger rod (31) is fixedly connected to the bottom wall of the nail body (1) at the insertion hole (11). The bottom of the pin body (21) is provided with a trigger hole (211) for inserting the trigger rod (31). The side wall of the pin body (21) is provided with a first receiving hole (212). The insertion rod (32) is located in the first receiving hole (212) and slides with the pin body (21). The connection is made so that the first storage hole (212) and the trigger hole (211) are connected. The first storage hole (212) penetrates the inner side wall of the pin (21). The side wall of the insertion rod (32) is fixed with a first fixing block (331). The first fixing block (331) and the pin (21) are fixedly connected with a first spring (33) between the inner wall of the first storage hole (212). The side wall of the nail body (1) is provided with an insertion hole (16) that is compatible with the insertion rod (32). The inside of the nail body (1) is provided with a snap-fit ​​assembly (4) that is compatible with the insertion rod (32). The nail body (1) has a second storage hole (5) on both sides of the insertion hole (16). The snap-fit ​​assembly (4) is located in the second storage hole (5). The snap-fit ​​assembly (4) includes a snap-fit ​​block (41) and a snap-fit ​​spring (42). The snap-fit ​​spring (42) is fixedly connected between the snap-fit ​​block (41) and the nail body (1). The side wall of the insertion rod (32) has a snap-fit ​​hole (321) that is adapted to snap-fit ​​the snap-fit ​​block (41).

2. The interlocking screw according to claim 1, characterized in that: The nail body (1) has a wire hole (14) on its side wall, and the locking device (2) has a wire hole (22) through it.

3. The interlocking screw according to claim 1, characterized in that: The length of the double thread (13) in the axial direction of the circumferential sidewall of the nail body (1) is equal to the length of the pin body (21).

4. The interlocking screw according to claim 1, characterized in that: The sidewall of the pin (21) is provided with a plurality of barbs (23).

5. The interlocking screw according to claim 1, characterized in that: The top of the nail body (1) is provided with a square hole (15), which is adapted to be inserted into the inserter.

6. The interlocking screw according to claim 1, characterized in that: The diameter of the locking device (2) gradually increases from bottom to top, and the minimum diameter of the locking device (2) is greater than the diameter of the top of the nail body (1).

7. The interlocking screw according to claim 1, characterized in that: The nail body (1) has a movable groove (17) above the insertion hole (16). The bottom of the movable groove (17) is connected to the insertion hole (16). The top of the movable groove (17) penetrates the top wall of the nail body (1). A locking rod (6) is provided in the movable groove (17). The locking rod (6) is slidably connected to the nail body (1). A pair of locking plates (61) are hinged to the top of the locking rod (6). The two locking plates (61) are arranged opposite to each other. A torsion spring (62) is installed between the locking plates (61) and the locking rod (6). The bottom of the locking device (2) has a locking hole (24) for the locking rod (6) and the locking plates (61) to be inserted.

8. The interlocking screw according to claim 7, characterized in that: The side wall of the locking rod (6) is fixed with a second fixing block (7), and the second fixing block and the nail body (1) are fixedly connected with a second spring (71) on the inner wall between the movable groove (17).

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