Bone fracture anti-loosening screw

Abstract

The utility model relates to a kind of bone fracture prevention screw, it is related to medical instrument technical field, including screw body and anti-off component, the screw body includes tension head end and anti-off tail end, the surface of tension head end and anti-off tail end is provided with outer thread, the anti-off component is hollow structure, and cavity is formed inside, and the inner surface of cavity is provided with internal thread, and is fixed with anti-off tail end thread connection, bone fracture prevention screw is embedded in bone and is fixed to fracture site. The utility model can make fracture end close contact to the bidirectional sustained pressure of fracture site, improve local blood circulation, provide better mechanical environment for fracture healing, accelerate fracture healing process, reduce the risk of screw loosening, withdrawal and fracture displacement, improve the stability of internal fixation.

Description

Technical Field

[0001] This utility model relates to the field of medical device technology, specifically to a bone-setting anti-dislodgement screw. Background Technology

[0002] Femoral neck fracture is a common type of fracture, especially prevalent in the elderly, and is often caused by osteoporosis and low-energy trauma. Traditional cannulated lag screw fixation of the femoral neck is a commonly used treatment method, but it has several limitations:

[0003] 1. In terms of fixation stability: Traditional hollow tension screws apply pressure in one direction, which has weak resistance to shear and rotation, making them prone to fracture displacement and screw dislodgement, leading to nonunion of fractures, femoral head necrosis, etc., increasing patient suffering and medical costs.

[0004] 2. Regarding bone adaptability: There are many elderly patients with osteoporosis. Traditional screws have poor holding force in osteoporotic bone and are prone to loosening after surgery, which limits the scope of application of the surgery and increases the risk and difficulty of treatment.

[0005] 3. Postoperative rehabilitation: Traditional screw fixation has limited stability, requiring patients to stay in bed for a long time after surgery, resulting in slow recovery, increased likelihood of complications such as muscle atrophy and joint stiffness, affecting patients' quality of life, and prolonging the rehabilitation period and hospitalization time.

[0006] The aforementioned problems spurred the development of a new type of anti-removal hollow tension screw. Utility Model Content

[0007] In view of the shortcomings of the prior art, this utility model provides a bone-setting anti-dislodgement screw, which aims to solve the problems of easy dislodgement of fixation screws at fracture sites and slow fracture healing in the prior art.

[0008] To achieve the above-mentioned technical effects, one aspect of this application provides a bone-setting anti-dislocation screw, including a screw body and an anti-dislocation component. The screw body includes a tension head end and an anti-dislocation tail end. Both the tension head end and the anti-dislocation tail end are provided with external threads. The anti-dislocation component is a hollow structure with an internal cavity. The inner surface of the cavity is provided with internal threads, which are threadedly connected and fixed to the anti-dislocation tail end. The bone-setting anti-dislocation screw is embedded in the bone to fix the fracture site.

[0009] According to a preferred embodiment of the present invention, the outer surface of the anti-detachment component is provided with external threads.

[0010] According to a preferred embodiment of the present invention, the screw body has a hollow structure.

[0011] According to a preferred embodiment of the present invention, a first screwdriver fixing groove is provided at the top of the anti-detachment tail end.

[0012] According to a preferred embodiment of the present invention, the top of the anti-detachment component is provided with a central hole that extends into the cavity.

[0013] According to a preferred embodiment of the present invention, the central hole is disposed in the second screwdriver fixing groove.

[0014] According to a preferred embodiment of the present invention, the screw body and the anti-loosening component are made of alloy material.

[0015] According to a preferred embodiment of the present invention, the length of the bone-setting anti-dislodgement screw is 75mm-110mm.

[0016] The beneficial effects of this utility model are as follows:

[0017] 1. Promotes fracture healing: The screw has a threaded design at both the head and tail, which can achieve bidirectional continuous pressure on the fracture site, allowing the fracture ends to make close contact, improving local blood circulation, providing a better mechanical environment for fracture healing, accelerating the fracture healing process, and shortening the patient's recovery time.

[0018] 2. Improved fixation stability: Compared with the existing single-thread structure, the threaded anti-dislodgement design and bidirectional pressure-optimized structure of the anti-dislodgement component enhance the screw's holding force and stability in the bone tissue, effectively resist various stresses at the fracture ends, reduce the risk of screw loosening, dislodgement, and fracture displacement, improve the success rate of internal fixation, and reduce the incidence of postoperative complications such as nonunion, femoral head necrosis, and screw dislodgement.

[0019] 3. Facilitates surgical procedures: The hollow structure of the screw facilitates guide pin guidance and allows for tight overlapping of the screw body and anti-dislodgement components, making screw implantation more precise, reducing the difficulty of surgical procedures, reducing surgical risks and radiation exposure for patients and medical staff. At the same time, the hollow structure also helps to reduce the weight of the screw itself and reduce pressure on surrounding tissues.

[0020] 4. Reduce patient burden: Because it can promote faster fracture healing and reduce complications, patients can start functional exercises and return to normal life earlier, reducing hospitalization time and medical expenses, and alleviating the economic and psychological burden on patients. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of the bone-setting anti-dislodgement screw of this utility model;

[0022] Figure 2 This is a schematic diagram of the screw body of this utility model;

[0023] Figure 3 This is a cross-sectional schematic diagram of the anti-detachment component of this utility model;

[0024] Figure 4This is a schematic diagram of the second screwdriver fixing groove structure of this utility model.

[0025] Among them, 1. screw body; 11. pull head end; 12. anti-loosening tail end; 13. first screwdriver fixing groove;

[0026] 2. Anti-detachment component; 21. Chamber; 22. Center hole; 23. Second screwdriver fixing slot. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0028] Figure 1 This is a schematic diagram of the structure of the bone-setting anti-dislocation screw of this utility model. Figure 2 This is a schematic diagram of the screw body 1 of this utility model. Figure 3 This is a cross-sectional schematic diagram of the anti-detachment component 2 of this utility model. (See diagram below.) Figure 1-3 As shown, a bone-setting anti-dislocation screw includes a screw body 1 and an anti-dislocation component 2. The screw body 1 includes a tension head end 11 and an anti-dislocation tail end 12. Both the tension head end 11 and the anti-dislocation tail end 12 are provided with external threads. The anti-dislocation component 2 is a hollow structure with an internal cavity 21. The inner surface of the cavity 21 is provided with internal threads, which are threadedly connected and fixed to the anti-dislocation tail end 12. The bone-setting anti-dislocation screw is embedded in the bone to fix the fracture site. It exerts bidirectional tension on the proximal and distal ends of the fracture. The screw body 1 and the anti-dislocation component 2 are designed to overlap tightly. Through reasonable tension distribution, it promotes close contact between the fracture ends, which is beneficial to fracture healing.

[0029] The screw body 1 is a cylindrical screw body. The tension thread design mechanism of the tension head end 11 of the screw body 1 reduces or prevents the screw from loosening or coming out after surgery. The diameter of the anti-dislodgement tail end 12 is smaller than that of the tension head end 11.

[0030] The top of the anti-detachment tail end 12 is provided with a first screwdriver fixing groove 13 for fixing the front end of the screwdriver, so that the screw body 1 can be screwed into the bone with the screwdriver. The maximum width of the first screwdriver fixing groove 13 is 2.7mm.

[0031] The anti-dislodgement component 2 is a cylindrical nail body. The internal threads on the inner wall of the chamber 21 cooperate with the external threads of the anti-dislodgement tail end 12 of the screw body 1 for fixation. The outer surface is also provided with external threads, which are embedded in the bone to further increase the tensile force at the fracture site, prevent the screw from loosening or coming out after surgery, and enhance the fixation stability of the screw on the fracture ends.

[0032] The screw body 1 and the anti-loosening component 2 are designed as hollow structures, and the top of the anti-loosening component 2 is provided with a second screwdriver fixing groove 23. Figure 4 This is a schematic diagram of the second screwdriver fixing groove structure of this utility model, as shown below. Figure 4 As shown, the second screwdriver fixing groove 23 has an internal hexagonal structure, which makes it easy to screw the anti-dislodgement part 2 into the bone with a screwdriver. The first screwdriver fixing groove 13 has the same structure as the second screwdriver fixing groove 23, and the maximum width of the second screwdriver fixing groove 23 is 4mm.

[0033] The second screwdriver fixing groove 23 has a central hole 22 that extends into the chamber 21, facilitating the insertion of the guide needle during surgery and ensuring a tight fit between the screw body 1 and the anti-dislodgement component 2, thereby improving surgical precision and ease of operation. Simultaneously, the hollow structure helps reduce the weight of the screw itself and minimizes pressure on surrounding tissues.

[0034] The total length of the bone-setting anti-dislodgement screw is 75mm-110mm. The tension head end 11 of the screw body 1 is 21mm long and 7.3mm in diameter. The anti-dislodgement tail end 12 is 2.7mm in diameter. The anti-dislodgement component 2 has a diameter of 5mm at the unthreaded part and a thread length of 21mm, including the thread diameter of 7.3mm.

[0035] The screw body 1 and the anti-loosening component 2 are made of stainless steel or alloy, which are highly resistant to corrosion and wear.

[0036] How to use this utility model:

[0037] A Kirschner wire is placed outside the skin as a guide pin. A matching hollow drill is drilled in the direction of the guide pin and fixed in the first screwdriver slot 13 of the anti-dislodgement end 12 with a screwdriver. The screw body 1 of the bone-setting anti-dislodgement screw is then screwed in, ensuring the screw body 1 reaches a depth of 1.5-2.0 cm below the bone cartilage surface. Then, the anti-dislodgement component 2 is fixed in the second screwdriver slot 23 at the top of the anti-dislodgement component 2 and screwed in along the direction of the guide pin in the central hole 22, ensuring the internal thread of the anti-dislodgement component 2 completely matches the external thread of the anti-dislodgement end 12 of the screw body 1 to form a single unit. The bone-setting anti-dislodgement screw is then screwed into the appropriate position within the bone, ensuring the tension head 11 of the screw body 1 passes through the fracture line and applies bidirectional pressure to the fracture ends to prevent screw dislodgement. Two to three hollow screws are fixed in the same way, positioned in an inverted triangle shape. Finally, the wound is sealed.

[0038] This invention applies continuous bidirectional pressure to the fracture site, which can make the fracture ends in close contact, improve local blood circulation, provide a better mechanical environment for fracture healing, accelerate the fracture healing process, reduce the risk of screw loosening, removal, and fracture displacement, and improve the stability of internal fixation.

[0039] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.

[0040] Furthermore, it is clear that the word "comprising" does not exclude other units or steps, and the singular does not exclude the plural. Multiple units or devices recited in a device claim may also be implemented by a single unit or device through software or hardware. The terms "first," "second," etc., are used to indicate names and do not indicate any specific order.

Claims

1. A bone fracture anti-backout screw, characterized by: The screw body (1) includes a screw body (1) and an anti-dislodgement component (2). The screw body (1) includes a tension head end (11) and an anti-dislodgement tail end (12). Both the tension head end (11) and the anti-dislodgement tail end (12) are provided with external threads. The anti-dislodgement component (2) is a hollow structure with a cavity (21) inside. The inner surface of the cavity (21) is provided with internal threads and is threadedly connected and fixed to the anti-dislodgement tail end (12). The bone-setting anti-dislodgement screw is embedded in the bone to fix the fracture site.

2. The bone uniting anti-backout screw according to claim 1, characterized in that: The outer surface of the anti-detachment component (2) is provided with external threads.

3. The bone uniting anti-backout screw of claim 1 wherein: The screw body (1) has a hollow structure.

4. The bone uniting anti-backout screw of Claim 1 wherein: The top of the anti-detachment tail end (12) is provided with a first screwdriver fixing groove (13).

5. The bone uniting anti-backout screw of Claim 1 wherein: The top of the anti-detachment component (2) is provided with a second screwdriver fixing groove (23).

6. The bone-setting anti-dislocation screw according to claim 5, characterized in that: The second screwdriver fixing groove (23) is provided with a central hole (22) that extends into the cavity (21).

7. The bone-setting anti-dislocation screw according to claim 1, characterized in that: The screw body (1) and the anti-loosening component (2) are made of alloy material.

8. The bone-setting anti-dislocation screw according to claim 1, characterized in that: The length of the bone-setting anti-dislodgement screw is 75mm-110mm.

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