Bone screw

Abstract

The utility model relates to the technical field of screws, in particular to a bone screw which comprises a first screw and at least one second screw, the first screw comprises a first stud and a first screw head coaxially and fixedly connected to the first stud, and a first threaded hole is formed in the end, away from the first screw head, of the first stud; the second screw comprises a second stud and a second screw head coaxially and fixedly connected to the second stud, and the second screw head is in threaded connection with the first threaded hole. In an operation, if the length of the bone screw required by a fracture part is larger than that of the first screw, the second screw can be assembled on the first stud, that is, the second screw head is locked and attached to the first threaded hole, so that the overall length of the bone screw is adjusted.

Description

Technical Field

[0001] The present application relates to the technical field of screws, and in particular to a bone screw. Background Art

[0002] Fractures caused by sports injuries are a common type of sports injury. Bone screws, as one of the indispensable medical devices in fracture internal fixation surgery, are generally used to fix internal fractures / dislocations. Bone screws are directly screwed into two different bone blocks or fixed bone plates to fix fractures, locate bones and promote their healing.

[0003] Since the screw lengths required at different parts are different, the lengths of existing bone screws of the same specification cannot be adjusted as needed, and therefore further improvements are needed. Utility Model Content

[0004] In order to facilitate the adjustment of the length of a bone screw, the present application provides a bone screw.

[0005] The present application provides a bone screw that adopts the following technical solution:

[0006] A bone screw comprises a first screw and at least one second screw, wherein the first screw comprises a first stud and a first screw head coaxially fixedly connected to the first stud, a first threaded hole is provided at one end of the first stud away from the first screw head, and the second screw comprises a second stud and a second screw head coaxially fixedly connected to the second stud, and the second screw head is threadedly connected to the first threaded hole.

[0007] By adopting the above technical solution, during surgery, if the length of the bone screw required for the fracture site is greater than the length of the first screw, the second screw can be assembled on the first stud, that is, the second screw head is locked to the first threaded hole, thereby adjusting the overall length of the bone screw.

[0008] Preferably, a plurality of the second screws are provided, a second threaded hole is formed at one end of the second stud away from the second screw head, and the second screw head on the rear second screw is threadedly connected to the second threaded hole on the front second screw.

[0009] By adopting the above technical solution, if the bone screw length condition required for the fracture site is still not met after assembling a second screw on the first screw, a second screw can be assembled on the second screw, that is, the second screw head thread on the latter second screw is connected to the second threaded hole on the former second screw, and multiple second screws are assembled in sequence, thereby increasing the length of the bone screw.

[0010] Preferably, a limiting tail plug is provided at the tail of the second stud at the tail end, and the outer diameter of the limiting tail plug is greater than the outer diameter of the second screw.

[0011] By adopting the above technical solution, a limiting tail plug is additionally provided, and the outer diameter of the limiting tail plug is larger than the outer diameter of the second screw, thereby effectively reducing the possibility of over-rotation of the bone screw.

[0012] Preferably, the limiting tail plug is integrally fixed to the second stud located at the tail end.

[0013] Preferably, the limiting tail plug is detachably connected to a second stud located at the tail end.

[0014] By adopting the above technical solution, the limiting tail plug can be detachably connected to the second stud located at the tail end, so that the first screw and the second screw can be made into the same specifications. During the assembly process, there is no need to distinguish between the first screw / the second screw. After the second screw is assembled, the limiting tail plug can be directly installed on the second stud located at the tail end, thereby improving the assembly convenience of the bone screw.

[0015] Preferably, a polygonal groove is formed on the end surface of the limiting tail plug away from the first screw head.

[0016] By adopting the above technical solution, it is convenient for the operator to insert the special tool into the polygonal groove, so that the limiting tail plug can be driven to rotate by rotating the special tool.

[0017] Preferably, the first screw and the second screw are both magnesium alloy screws.

[0018] By adopting the above technical solution, the first screw and the second screw are both made of magnesium alloy material. Magnesium is a substance necessary for human bone growth, which can be absorbed in the body and will not cause allergic reactions. Usually, pure magnesium is absorbed faster than the bone healing rate in the human body, so aluminum, zinc or rare earth metals are added to make magnesium alloy, which is to extend the time for magnesium to be absorbed in the human body. After the bone heals, the magnesium alloy bone screws are dissolved in the body together, and there is no need for the patient to undergo a second operation to remove the bone screws.

[0019] Preferably, the end face of the second stud is coaxially fixedly connected to the optical axis, and the second screw head is coaxially fixedly connected to the optical axis. After the second screw head is locked in the first threaded hole, the optical axis is inserted into the first threaded hole, and the outer peripheral wall of the optical axis has a limiting groove, and the outer peripheral wall of the first stud is penetrated by a limiting piece which is clamped in the limiting groove.

[0020] By adopting the above technical solution, after the second screw head is locked in the first threaded hole, the optical axis is inserted into the first threaded hole, and then the limit member is inserted into the first stud, and the limit member is clamped in the limit slot, which effectively reduces the possibility of the first screw and the second screw being detached, and improves the connection stability of the first screw and the second screw.

[0021] In summary, the utility model has the following beneficial effects:

[0022] 1. During surgery, if the length of the bone screw required for the fracture site is greater than the length of the first screw, the second screw can be assembled on the first screw, that is, the second screw head is locked to the first threaded hole, thereby adjusting the overall length of the bone screw;

[0023] 2. If the bone screw length required for the fracture site is still not met after assembling a second screw on the first screw, another second screw can be assembled on the second screw, that is, the second screw head on the latter second screw is threadedly connected to the second threaded hole on the former second screw, and multiple second screws are assembled in sequence, thereby increasing the length of the bone screw;

[0024] 3. The limiting tail plug can be detachably connected to the second stud at the tail end, so that the first screw and the second screw can be made into the same specifications. During the assembly process, there is no need to distinguish between the first screw / the second screw. After the second screw is assembled, the limiting tail plug can be directly installed on the second stud at the tail end, thereby improving the assembly convenience of the bone screws. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is a schematic diagram of the connection structure of the first screw and the second screw in Example 1;

[0026] Figure 2 is a schematic diagram of the structure of the position-limiting tail plug in Example 1;

[0027] Figure 3 is a schematic structural diagram of a bone screw in Example 2;

[0028] Figure 4 It is a schematic diagram of the connection structure of the first screw and the second screw in Example 3.

[0029] In the figure, 1, first screw; 11, first stud; 12, first screw head; 13, first threaded hole; 14, limit piece; 2, second screw; 21, second stud; 22, second screw head; 23, second threaded hole; 24, optical axis; 25, limit slot; 3, limit tail plug; 31, polygonal groove; 32, third screw head. DETAILED DESCRIPTION

[0030] The following is combined with Figure 1-4 This application is described in further detail.

[0031] Embodiment 1:

[0032] The present application embodiment discloses a bone screw, referring to Figure 1 , including a first screw 1 and at least a second screw 2. In this embodiment, the second screw 2 is provided with one, and both the first screw 1 and the second screw 2 are magnesium alloy screws.

[0033] The first screw 1 includes a first stud 11 and a first screw head 12 coaxially fixedly connected to one end of the first stud 11, and a first threaded hole 13 is coaxially opened at one end of the first stud 11 away from the first screw head 12. The second screw 2 includes a second stud 21 and a second screw head 22 coaxially fixedly connected to one end of the second stud 21, and the second screw head 22 is threadedly connected to the first threaded hole 13. The first stud 11 and the second stud 21 have the same outer diameter, and the outer peripheral walls of the first stud 11 and the second stud 21 both have locking external threads, and the outer peripheral walls of the first screw head 12 and the second screw head 22 both have screw-in external threads.

[0034] Reference Figure 1 , Figure 2 A limiting tail plug 3 is provided at one end of the second stud 21 away from the second screw head 22, and the outer diameter of the limiting tail plug 3 is greater than the outer diameter of the second screw 2. In this embodiment, the limiting tail plug 3 is integrally fixed to the second stud 21, and a polygonal groove 31 is provided on the end surface of the limiting tail plug 3 away from the first screw head 12.

[0035] The implementation principle of a bone screw in an embodiment of the present application is: during surgery, if the length of the bone screw required for the fracture site is greater than the length of the first screw 1, the second screw 2 can be assembled on the first stud 11, that is, by inserting a special tool into the polygonal groove 31, rotating the special tool to rotate the second stud 21, so as to lock the second screw head 22 to the first threaded hole 13, thereby increasing the overall length of the bone screw.

[0036] Embodiment 2:

[0037] The difference from Example 1 is that, referring to Figure 3 In the present embodiment, two second screws 2 are provided, and the two second screws 2 are detachably connected. Specifically, a second threaded hole 23 is provided at one end of the second stud 21 away from the second screw head 22, and the second screw head 22 of the rear second screw 2 is threadedly connected to the second threaded hole 23 of the front second screw 2.

[0038] The limiting tail plug 3 is detachably connected to the second stud 21 located at the tail end. Specifically, the limiting tail plug 3 is integrally protruded and fixed with a third screw head 32, the outer peripheral wall of the third screw head 32 has an external thread that is screwed in, and the third screw head 32 is threadedly connected to the second threaded hole 23 on the second stud 21 located at the tail end.

[0039] If the bone screw length required for the fracture site is still not met after assembling a second screw 2 on the first screw 1, another second screw 2 can be assembled on the second screw 2, that is, the second screw head 22 on the second screw 2 is threadedly connected to the second threaded hole 23 on the first screw 2, and multiple second screws 2 are assembled in sequence, thereby increasing the length of the bone screw. After the second screw 2 is assembled, the limiting tail plug 3 is directly installed on the second stud 21 at the tail end, that is, the third screw head 32 is threadedly connected to the second threaded hole 23 on the second stud 21 at the tail end, so as to improve the assembly convenience of the bone screw.

[0040] Embodiment 3:

[0041] The difference from Example 1 is that, referring to Figure 4 The end surface of the second stud 21 is coaxially fixedly connected with the optical axis 24, the second screw head 22 is coaxially fixedly connected to the optical axis 24, after the second screw head 22 is locked in the first threaded hole 13, the optical axis 24 is inserted into the first threaded hole 13, the outer peripheral wall of the optical axis 24 is surrounded by a limit slot 25, the outer peripheral wall of the first stud 11 is radially provided with a limit hole, and the outer peripheral wall of the first stud 11 is provided with a limit member 14 fixedly penetrated in the limit hole and clamped in the limit slot 25. In this embodiment, the limit hole is a countersunk threaded hole, and the limit member 14 is a countersunk top screw threadedly connected to the countersunk threaded hole, and the countersunk top screw is a magnesium alloy top screw.

[0042] After the second screw head 22 is locked in the first threaded hole 13, the optical axis 24 is inserted into the first threaded hole 13, and then the countersunk top screw is locked so that the end of the countersunk top screw is clamped in the limiting groove 25, effectively reducing the possibility of the first screw 1 and the second screw 2 being detached, and improving the connection stability of the first screw 1 and the second screw 2.

[0043] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A bone screw, characterized in that: The invention comprises a first screw (1) and at least one second screw (2), wherein the first screw (1) comprises a first stud (11) and a first screw head (12) coaxially fixedly connected to the first stud (11), a first threaded hole (13) is formed at one end of the first stud (11) away from the first screw head (12), and the second screw (2) comprises a second stud (21) and a second screw head (22) coaxially fixedly connected to the second stud (21), and the second screw head (22) is threadedly connected to the first threaded hole (13).

2. A bone screw according to claim 1, characterized in that: A plurality of second screws (2) are provided, and a second threaded hole (23) is provided at one end of the second stud (21) away from the second screw head (22), and the second screw head (22) on the rear second screw (2) is threadedly connected to the second threaded hole (23) on the front second screw (2).

3. A bone screw according to claim 2, characterized in that: A limiting tail plug (3) is provided at the tail of the second stud (21) at the tail end, and the outer diameter of the limiting tail plug (3) is greater than the outer diameter of the second screw (2).

4. A bone screw according to claim 3, characterized in that: The limiting tail plug (3) is integrally fixed to the second stud (21) located at the tail end.

5. A bone screw according to claim 3, characterized in that: The limiting tail plug (3) is detachably connected to the second stud (21) located at the tail end.

6. A bone screw according to claim 5, characterized in that: The position-limiting tail plug (3) is protruding and fixed with a third screw head (32), and the third screw head (32) is threadedly connected to a second threaded hole (23) on a second screw bolt (21) at the tail end.

7. A bone screw according to claim 3, characterized in that: A polygonal groove (31) is formed on the end surface of the limiting tail plug (3) away from the first screw head (12).

8. The bone screw according to claim 1, characterized in that: The first screw (1) and the second screw (2) are both magnesium alloy screws.

9. The bone screw according to claim 1, characterized in that: The end surface of the second screw (21) is coaxially fixedly connected to the optical axis (24), and the second screw head (22) is coaxially fixedly connected to the optical axis (24). After the second screw head (22) is locked in the first threaded hole (13), the optical axis (24) is inserted into the first threaded hole (13), and the outer peripheral wall of the optical axis (24) has a limiting groove (25), and the outer peripheral wall of the first screw (11) is penetrated by a limiting member (14) that is fixed in the limiting groove (25).

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