A fracture end compression screw

Abstract

The utility model discloses a fracture end compression screw, comprising a screw head and a screw rod connected to the screw head as an integral body, a screw tail being threadedly connected to the screw rod, a first external thread being arranged on the screw head, a second external screw being arranged on the screw rod, an internal thread matching the second external thread being arranged on the screw tail, a diameter of the screw head being larger than a diameter of the screw rod, a diameter of the screw tail being smaller than a diameter of the screw head, and a connecting cap being arranged at an end of the screw tail away from the screw head. The utility model realizes tightening and pressurizing the two fracture surfaces of the fractured bone by rotating the screw tail so that the screw tail continues to move along the screw rod until the connecting cap abuts against the bone.

Description

Technical Field

[0001] The utility model belongs to the technical field of medical instruments, and in particular relates to a fracture end compression screw. Background Art

[0002] For patients with more serious fractures, hospitals generally use bone plates and bone screws to fix the patient's fracture. When using this method, the bone screws need to be driven into the patient's bones to ensure good fixation of the bone plate.

[0003] Since bone screws in the prior art are mostly composed of a screw cap and a screw rod, their tightening is achieved by relying on the tension between the external thread on the screw rod and the screw cap. However, if the bone screw is directly used for connection, the bone screw can only play a fixing role, but cannot achieve the effect of tightening and pressurizing the two fracture surfaces of the broken bone.

[0004] Therefore, a fracture end compression screw is designed to solve the above problems. Utility Model Content

[0005] In view of this, an object of the present invention is to provide a fracture end compression screw, which is used to solve the problem of insufficient fracture end compression in the prior art.

[0006] In order to achieve the above object, the utility model provides the following technical solutions:

[0007] The utility model provides a fracture end compression screw, comprising a screw head and a screw rod connected to the screw head as an integral whole, a screw tail being threadedly connected to the screw rod, a first external thread being arranged on the screw head, a second external screw being arranged on the screw rod, an internal thread being arranged on the screw tail matching the second external thread, a diameter of the screw head being larger than a diameter of the screw rod, a diameter of the screw tail being smaller than a diameter of the screw head, and a connecting cap being arranged on the screw tail away from the screw head end.

[0008] Furthermore, the first external thread is a coarse thread, and the second external thread is a fine thread.

[0009] Furthermore, a through hole coaxially arranged with the screw head is provided in the screw head, and the through hole passes through the screw head and the screw rod.

[0010] Furthermore, the screw rod is provided with a first hexagonal countersunk hole away from the screw head end.

[0011] Furthermore, a second hexagonal countersunk hole is provided on the connecting cap.

[0012] Furthermore, the connecting cap is provided with a rounded corner near the tail of the screw.

[0013] Furthermore, the screw tail is arranged at a chamfered angle away from the connecting cap end.

[0014] An operating tool used in conjunction with a compression screw on a bone fracture end comprises: a fixing rod and a handle connected to the fixing rod as an integral unit, the fixing rod being provided with a first connecting head that cooperates with a first internal hexagonal countersunk hole at an end away from the handle, a movable rod being provided with a movable sleeve on the fixing rod, a second connecting head that cooperates with a second internal hexagonal countersunk hole on the movable rod, and an operating portion being provided at an end of the movable rod away from the second connecting head.

[0015] The beneficial effects of the utility model are as follows: by rotating the screw tail so that the screw tail continues to move along the screw rod until the connecting cap abuts against the bone, the two fracture surfaces of the broken bone are tightened and pressurized; the fracture ends are pressurized by the screw in conjunction with the steel plate, such as femoral condyle fracture; the fracture ends can be pressurized separately, such as comminuted fractures, and the fracture fragments that cannot be exposed can be pressurized to reduce the exposure range, such as pelvic fractures and femoral neck fractures.

[0016] Other advantages, objectives and features of the utility model will be described in the following description and will be apparent to those skilled in the art to some extent, or those skilled in the art can be taught from the practice of the utility model. The objectives and other advantages of the utility model can be realized and obtained through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to make the purpose, technical solution and beneficial effects of the utility model clearer, the utility model is described with the following drawings:

[0018] Figure 1 This is a schematic diagram of screw installation in an embodiment of the utility model;

[0019] Figure 2 This is a schematic diagram of the cooperation between a screw and an operating tool according to an embodiment of the utility model;

[0020] Figure 3 This is a schematic diagram of the screw structure of an embodiment of the utility model;

[0021] Figure 4 This is a schematic diagram of the structure of an operating tool according to an embodiment of the utility model.

[0022] The markings in the accompanying drawings are as follows: screw head 1, first external thread 101, through hole 102, screw rod 2, second external thread 201, first hexagonal countersunk hole 202, screw tail 3, internal thread 301, connecting cap 302, second hexagonal countersunk hole 303, fixing rod 4, first connecting head 401, handle 5, movable rod 6, second connecting head 601, operating part 602. DETAILED DESCRIPTION

[0023] like Figures 1 to 4As shown, the utility model provides a fracture end compression screw, comprising: a screw head 1 and a screw rod 2 connected to the screw head 1 as a whole, a screw tail 3 being threadedly connected to the screw rod 2, the screw head 1 being provided with a first external thread 101, the screw rod 2 being provided with a second external thread 201, the screw tail 3 being provided with an internal thread 301 matching the second external thread 201, the diameter of the screw head 1 being larger than the diameter of the screw rod 2, the diameter of the screw tail 3 being smaller than the diameter of the screw head 1, and a connecting cap 302 being provided at the end of the screw tail 3 away from the screw head 1.

[0024] In this solution, after the screw head 1 is screwed into the fracture end, the screw tail 3 is rotated to make the screw tail 3 continue to move along the screw rod 2 until the connecting cap 302 abuts against the bone, so that the two fracture surfaces of the broken bone are tightened and pressurized, and the first external thread 101 is screwed into the bone to ensure the gripping force of the screw in the bone cavity, and the screw tail 3 is further pressurized by selecting the second external thread 201, and the pressurization distance is large enough to ensure sufficient pressurization, and the diameter of the screw tail 3 is smaller than the diameter of the screw head 1, which is convenient for removing the screw, and the fracture end is pressurized by the screw and the steel plate, such as femoral condyle fracture; the fracture ends can be pressurized separately, such as comminuted fractures, and the fracture fragments that cannot be exposed can be pressurized to reduce the exposure range, such as pelvic fractures and femoral neck fractures.

[0025] In one embodiment of the utility model, the first external thread 101 is a coarse thread, and the second external thread 201 is a fine thread. The coarse thread with a larger pitch ensures the strength of the screw and the stability of the screw implantation, and the fine thread with a smaller pitch prevents the screw tail 3 and the screw rod 2 from loosening. The design of the fine thread makes the displacement of the screw tail 3 caused by the number of turns during the screwing-in process of the screw tail 3 being small, which is convenient for pressurization fine-tuning.

[0026] In one embodiment of the present invention, a through hole 102 coaxially arranged with the screw head 1 is provided in the screw head 1 , and the through hole 102 passes through the screw head 1 and the screw rod 2 .

[0027] In one embodiment of the present invention, a first hexagonal countersunk hole 202 is provided at the end of the screw rod 2 away from the screw head 1, so as to facilitate the screw rod 2 to be screwed into the bone by a tool.

[0028] In an embodiment of the present utility model, a second hexagonal countersunk hole 303 is provided on the connecting cap 302 so as to facilitate the connecting cap 302 to rotate by a tool.

[0029] In an embodiment of the present invention, the connection cap 302 is provided with a rounded corner near the screw tail 3 .

[0030] In one embodiment of the present invention, the screw tail 3 is chamfered away from the end of the connection cap 302 .

[0031] A kind of operating tool that cooperates with a screw, comprising: a fixed rod 4 and a handle 5 connected to the fixed rod 4 as an integral whole, the fixed rod 4 is provided with a first connecting head 401 that cooperates with a first hexagonal countersunk hole 202 at the end away from the handle 5, a movable rod 6 is movably sleeved on the fixed rod 4, the movable rod 6 is provided with a second connecting head 601 that cooperates with a second hexagonal countersunk hole 303, and the movable rod 6 is provided with an operating part 602 at the end away from the second connecting head 601.

[0032] In this solution, the screw tail 3 is first screwed into the screw rod 2, and then the screw is screwed into the bone through the operating tool. When in use, the first connecting head 401 is matched with the first hexagonal countersunk hole 202, and the screw head 1 is screwed into the bone by turning the handle 5. Then, the movable rod 6 is slid along the fixed rod 4 to make the second connecting head 601 match with the second hexagonal countersunk hole 303. The screw tail 3 is further screwed into the screw rod 2 by turning the operating part 602 to achieve double pressurization. Then, the operating tool is directly taken out, and it can be taken out in one step. The handle 5 and the operating part 602 are operated separately, so that the screwing in of the screw head 1 and the screw tail 3 will not interfere with each other.

[0033] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made in form and details without departing from the scope defined by the claims of the utility model.

Claims

1. A fracture end compression screw, characterized in that: It includes a screw head and a screw rod connected to the screw head as a whole, the screw rod is threadedly connected to a screw tail, the screw head is provided with a first external thread, the screw rod is provided with a second external screw, the screw tail is provided with an internal thread matching the second external thread, the diameter of the screw head is larger than the diameter of the screw rod, the diameter of the screw tail is smaller than the diameter of the screw head, and the screw tail is provided with a connecting cap away from the screw head end.

2. The fracture end compression screw according to claim 1, characterized in that: The first external thread is a coarse thread, and the second external thread is a fine thread.

3. The fracture end compression screw according to claim 1, characterized in that: A through hole is arranged coaxially with the screw head in the screw head, and the through hole passes through the screw head and the screw rod.

4. The fracture end compression screw according to claim 1, characterized in that: The screw rod is provided with a first hexagonal countersunk hole away from the screw head end.

5. The fracture end compression screw according to claim 1, characterized in that: The connecting cap is provided with a second hexagonal countersunk hole.

6. The fracture end compression screw according to claim 1, characterized in that: The connecting cap is provided with a rounded corner near the screw tail.

7. The fracture end compression screw according to claim 1, characterized in that: The screw tail is arranged away from the connecting cap end at a chamfered angle.

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