Threaded optimization stable bone screw

Abstract

The utility model provides a kind of thread optimization stable type bone screw, including bone screw body, the outer end of bone screw body is provided with multiple anti-pulling thread, the front end of bone screw body is fixedly connected with top cap, the outer end of bone screw body is equipped with outer protective sleeve, the rear end of outer protective sleeve is fixedly connected with stretchable sleeve, the inner side wall of outer protective sleeve is equipped with inner recess sliding ring, sliding connection has sliding outer block in inner recess sliding ring, two sliding outer blocks are fixedly connected with circular ring, circular ring and top cap are mutually nested between, and circle-shaped perforation is symmetrically opened in the left and right ends of top cap and circular ring, the protective structure of outer protective sleeve and stretchable sleeve is formed, provides comprehensive protection for bone screw body in transportation and preoperative preparation stage, the outer protective sleeve of high-strength medical-grade plastic material, with good impact resistance, effectively resist external collision and extrusion, avoid thread damage.

Description

Technical Field

[0001] This utility model relates to a thread-optimized and stable bone screw, belonging to the field of medical device technology. Background Technology

[0002] Bone screws are commonly used internal fixation devices in orthopedic surgery, primarily used to fix bones during fracture treatment to promote healing. They typically consist of a screw head, a shank, and threads. Screw heads come in various shapes, commonly including Phillips head and hexagonal head, mainly to facilitate gripping and tightening with surgical instruments.

[0003] An adjustable medical screw, patent number CN205163230U, includes a screw seat and a screw body. The upper end of the screw body has a screw head. The screw seat has a U-shaped groove and a through hole at its bottom. The screw body extends from the through hole, and the screw head is disposed within the screw seat. The outer circumferential shape of the screw head complements the shape of the inner wall of the through hole, and the screw seat and screw body are coaxially arranged. This adjustable medical screw provides a simple structure and convenient use. Because the orientation of the U-shaped groove in the screw seat can be adjusted without affecting the locking performance of the screw body, it simplifies and simplifies surgical procedures, significantly reducing surgical time and complexity.

[0004] In the field of orthopedic internal fixation treatment, bone screws are core instruments whose performance directly affects the fracture healing effect and the quality of patient rehabilitation. However, during transportation and storage, due to the lack of effective protective structures, the screw threads are prone to deformation or wear due to collisions and compression, which reduces the fit between the screw and bone tissue after implantation and affects the stability of fixation.

[0005] To address this, a thread-optimized, stable bone screw is proposed. Utility Model Content

[0006] In view of this, the present invention provides a thread-optimized and stable bone screw to solve or alleviate the technical problems existing in the prior art, and at least provides a beneficial alternative.

[0007] The technical solution of this utility model is implemented as follows: A thread-optimized and stable bone screw includes a bone screw body. The outer end of the bone screw body is provided with multiple anti-pull-out threads. A top nut is fixedly connected to the front end of the bone screw body. An outer protective sleeve is fitted on the outer end of the bone screw body. A stretchable sleeve is fixedly connected to the rear end of the outer protective sleeve. An inner groove sliding ring is opened on the inner side wall of the outer protective sleeve. A sliding outer block is slidably connected in the inner groove sliding ring. A circular sleeve is fixedly connected between two sliding outer blocks. The circular sleeve and the top nut fit together. Circular through holes are symmetrically opened at the left and right ends of the top nut and the circular sleeve. Multiple circular through holes are interconnected. An L-shaped flexible adjustable plug rod is slidably connected to the inner end of two corresponding circular through holes.

[0008] More preferably, the bone screw body extends into the perforation site of the affected area, and the pull-out resistant thread and the inner wall of the perforation site of the affected area are in contact with each other.

[0009] More preferably, the front ends of the two L-shaped flexible adjustable plug rods are respectively fixedly connected to internal matching sliders, and the front end of the top nut is provided with an external cross block.

[0010] More preferably, the rear end of the outer horizontal block is symmetrically provided with symmetrical grooves on the left and right sides, and the two inner matching sliders are respectively located in the corresponding symmetrical grooves.

[0011] More preferably, a plurality of spring connectors are fixedly connected between the two L-shaped flexible adjustable plug rods, and the plurality of spring connectors are arranged at equal intervals.

[0012] More preferably, the circular sleeve and the top nut are detachably connected to each other via an L-shaped flexible adjustable plug rod.

[0013] More preferably, the rear end of the stretchable sleeve is fixedly connected to a skin contact abutment, and the skin contact abutment and the perforation site of the affected area are in contact with each other.

[0014] The present invention has the following advantages due to the adoption of the above technical solution:

[0015] I. This utility model provides comprehensive protection for the bone screw body during transportation and preoperative preparation through a protective structure consisting of an external protective sleeve and a stretchable sleeve. The high-strength medical-grade plastic external protective sleeve effectively resists external collisions and compressions due to its excellent impact resistance, preventing damage to the threads. Its inner wall features a grooved sliding ring, a sliding outer block, a circular sleeve, and an L-shaped flexible adjustable insertion rod, which work together with the top nut to form a stable limiting connection, ensuring that the protective sleeve is securely fitted. During screw implantation, the protective sleeve does not need to be removed. When the stretchable sleeve is deformed by compression, the sliding outer block slides smoothly along the grooved sliding ring, providing continuous protection and preventing surgical instruments from colliding with the threads, thus ensuring that the screw fixation performance is not affected.

[0016] II. This utility model utilizes a detachable connection method composed of an L-shaped flexible adjustable plug rod and a spring connector. After the screw is fixed, the doctor only needs to apply inward pressure to the L-shaped flexible adjustable plug rod to overcome the elasticity of the spring connector, and then pull out the plug rod, detaching the circular sleeve from the top nut. The flexibility of the L-shaped flexible adjustable plug rod does not affect the contact between the installation tool and the top nut, making it convenient for the doctor to fine-tune the screw. At the same time, the elastic potential energy stored in the compressible sleeve can assist in the detachment of the outer protective sleeve, making the operation convenient and efficient.

[0017] Third, this utility model uses a skin contact ring fixed at the rear end of a stretchable sleeve. When placed before surgery, it isolates the screw from the external environment, preventing dust, bacteria, and other contaminants from contacting the screw body, thus further enhancing the protective effect. During screw implantation, the skin contact ring fits tightly against the skin around the perforation site, playing a positioning and buffering role. This helps doctors accurately control the screw implantation depth and avoid damage to surrounding tissues due to excessive screwing. At the same time, its fitting design reduces the gap between the skin and the stretchable sleeve, lowering the risk of postoperative infection and creating a good environment for wound healing.

[0018] The above overview is for illustrative purposes only and is not intended to be limiting in any way. In addition to the illustrative aspects, embodiments, and features described above, further aspects, embodiments, and features of the present invention will become readily apparent from the accompanying drawings and the following detailed description. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the bone screw body structure of this utility model;

[0021] Figure 2 This is a schematic diagram of the external protective sleeve structure of this utility model;

[0022] Figure 3 This is a schematic diagram of the explosion structure of the external protective sleeve of this utility model;

[0023] Figure 4 This is a schematic diagram of the external protective sleeve of this utility model in use.

[0024] Figure 5This is a schematic diagram of the external horizontal block structure of this utility model.

[0025] Reference numerals: 1. Bone screw body; 2. Anti-pull-out thread; 3. Top nut; 5. Outer protective sleeve; 6. Stretchable sleeve; 7. Skin contact ring; 8. Perforation site; 9. Inner groove sliding ring; 10. Sliding outer block; 11. Circular ring; 12. Outer horizontal block; 13. L-shaped flexible adjustable insertion rod; 14. Spring connector; 15. Circular perforation; 16. Symmetrical groove position; 17. Inner matching slider. Detailed Implementation

[0026] In the following description, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments can be modified in various ways without departing from the spirit or scope of this invention. Therefore, the drawings and description are considered exemplary in nature and not restrictive.

[0027] The embodiments of this utility model will now be described in detail with reference to the accompanying drawings.

[0028] Example 1

[0029] like Figure 1-5 As shown, this utility model embodiment provides a thread-optimized and stable bone screw, including a bone screw body 1. The outer end of the bone screw body 1 is provided with multiple anti-pull-out threads 2. The front end of the bone screw body 1 is fixedly connected to a top nut 3. The outer end of the bone screw body 1 is fitted with an outer protective sleeve 5. The rear end of the outer protective sleeve 5 is fixedly connected to a stretchable sleeve 6. The inner sidewall of the outer protective sleeve 5 is provided with an inner groove sliding ring 9. The inner groove sliding ring 9 is slidably connected to a sliding outer block 10. A circular sleeve 11 is fixedly connected between two sliding outer blocks 10. The circular sleeve 11 and the top nut 3 fit together. The top nut 3 and the circular sleeve 11 are symmetrically provided with circular through holes 15 at their left and right ends. The multiple circular through holes 15 are interconnected. The inner ends of two corresponding circular through holes 15 are slidably connected to L-shaped flexible adjustable plug rods 13.

[0030] The bone screw body 1 extends into the perforation position 8 of the affected area. The anti-pull-out thread 2 and the inner wall of the perforation position 8 of the affected area are in contact with each other. The front ends of the two L-shaped flexible adjustable plug rods 13 are respectively fixedly connected to the inner matching sliders 17. The front end of the top nut 3 is provided with an outer horizontal block 12. The rear ends of the outer horizontal block 12 are symmetrically provided with symmetrical grooves 16 on the left and right sides. The two inner matching sliders 17 are respectively located in the corresponding symmetrical grooves 16. Multiple spring connectors 14 are fixedly connected between the two L-shaped flexible adjustable plug rods 13. The multiple spring connectors 14 are equidistant from each other.

[0031] Example 2

[0032] like Figure 3 As shown, in one embodiment, the circular sleeve 11 and the top nut 3 are detachably connected to each other by an L-shaped flexible adjustable plug rod 13, and the rear end of the stretchable sleeve 6 is fixedly connected to a skin contact abutment 7, which is in contact with the perforation site 8 of the affected area.

[0033] The skin contact ring 7, fixed at the rear end of the stretchable sleeve 6, is isolated from the external environment during preoperative placement, preventing dust, bacteria, and other contaminants from contacting the bone screw body 1, thus further enhancing the protective effect. During screw implantation, the skin contact ring 7 fits tightly against the skin around the perforation site 8, playing a positioning and buffering role, helping doctors to accurately control the screw implantation depth and avoid damage to surrounding tissues due to excessive screwing. At the same time, its fitting design reduces the gap between the skin and the stretchable sleeve 6, reducing the risk of postoperative infection and creating a good environment for wound healing.

[0034] In operation, during transportation and preoperative preparation, the external protective sleeve 5 and the stretchable sleeve 6 of the bone screw body 1 can resist collisions and compression during transportation. The inner groove sliding ring 9 on its inner wall cooperates with the sliding outer block 10. The circular sleeve 11 fixed by the two sliding outer blocks 10 fits onto the top nut 3, forming a stable limiting structure. At the same time, the L-shaped flexible adjustable plug rod 13 passes through the annular through hole 15 of the top nut 3 and the circular sleeve 11. The inner matching slider 17 at the front end is embedded in the symmetrical groove position 16 of the outer horizontal block 12, and the spring connector 14 provides the preload force. The outer protective sleeve 5 is securely fitted over the bone screw body 1. During surgery, the surgeon holds the top nut 3 and aligns the bone screw body 1 with the perforation site 8 at the affected area. The pull-out thread 2 at the outer end of the bone screw body 1 is specially designed with optimized thread profile and pitch. During insertion, the thread tip first cuts into the bone wall. As the screw penetrates deeper, the thread gradually engages tightly with the bone tissue. Because the pull-out thread 2 is in close contact with the inner wall of the perforation site 8, the thread effectively grips the bone tissue with each rotation, generating a strong anchoring force. During this process, the outer protective sleeve 5 does not need to be removed. As the main body 1 is inserted deeper, the stretchable sleeve 6 is gradually compressed and deformed by the pressure of bone tissue and skin. The sliding outer block 10 slides smoothly along the inner groove sliding ring 9, ensuring that the outer protective sleeve 5 always fits against the outside of the bone screw body 1, continuously providing protection and preventing accidental collisions between surgical instruments and the threads, which could affect the fixation performance of the threads. When the bone screw body 1 is screwed in to the predetermined depth, the L-shaped flexible adjustable insertion rod 13 has good flexibility and does not affect the insertion of tools. After the fixation of the fracture site is completed, the outer protective sleeve 5 needs to be removed. At this time, the doctor applies inward pressure to the two L-shaped flexible adjustable insertion rods 13. Under pressure, the elastic circular sleeve 11 of the spring connector 14 is released from the connection with the top nut 3. Since the stretchable sleeve 6 stores a certain elastic potential energy during the compression process, and the outer protective sleeve 5 has a certain weight, after the connection is released, the stretchable sleeve 6 restores its deformation and pushes the outer protective sleeve 5 to slide outward along the bone screw body 1 until it is completely separated. Throughout the process, the flexible characteristics of the L-shaped flexible adjustable plug rod 13 ensure that it does not block the contact between the installation tool and the top nut 3. The doctor can still use the tool to make fine adjustments to the top nut 3 to ensure the fixation effect of the bone screw.

[0035] The above are merely specific embodiments of this utility model, but the protection scope of this utility model is not limited thereto. Any person skilled in the art can easily conceive of various variations or substitutions within the technical scope disclosed in this utility model, and these should all be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the protection scope of the claims.

Claims

1. A thread-optimized, stabilizing bone screw, comprising a bone screw body (1), characterized in that: The outer end of the bone screw body (1) is provided with multiple anti-pull-out threads (2). The front end of the bone screw body (1) is fixedly connected with a top nut (3). The outer end of the bone screw body (1) is fitted with an outer protective sleeve (5). The rear end of the outer protective sleeve (5) is fixedly connected with a stretchable sleeve (6). The inner sidewall of the outer protective sleeve (5) is provided with an inner groove sliding ring (9). The inner groove sliding ring (9) is slidably connected with a sliding outer block (10). A circular sleeve (11) is fixedly connected between two sliding outer blocks (10). The circular sleeve (11) and the top nut (3) fit together. The top nut (3) and the circular sleeve (11) are symmetrically provided with circular through holes (15) at their left and right ends. Multiple circular through holes (15) are interconnected. The inner ends of two corresponding circular through holes (15) are slidably connected with L-shaped flexible adjustable plug rods (13).

2. The thread-optimized, stabilizing bone screw according to claim 1, characterized in that: The bone screw body (1) extends into the perforation site (8) of the affected area, and the anti-pull-out thread (2) and the inner wall of the perforation site (8) of the affected area are in contact with each other.

3. The thread-optimized, stabilizing bone screw according to claim 1, characterized in that: The front ends of the two L-shaped flexible adjustable plug rods (13) are respectively fixedly connected to the inner matching sliders (17), and the front end of the top nut (3) is provided with an outer cross block (12).

4. The thread-optimized, stabilizing bone screw according to claim 3, characterized in that: The outer horizontal block (12) has symmetrical grooves (16) on the left and right sides of its rear end, and the two inner matching sliders (17) are located in the corresponding symmetrical grooves (16).

5. The thread-optimized, stabilizing bone screw according to claim 1, characterized in that: Multiple spring connectors (14) are fixedly connected between the two L-shaped flexible adjustable plug rods (13), and the multiple spring connectors (14) are equidistant from each other.

6. The thread-optimized, stabilizing bone screw according to claim 1, characterized in that: The circular ring (11) and the top nut (3) are detachably connected to each other by an L-shaped flexible adjustable plug rod (13).

7. The thread-optimized, stabilizing bone screw according to claim 2, characterized in that: The rear end of the stretchable sleeve (6) is fixedly connected to a skin contact ring (7), and the skin contact ring (7) and the perforation site (8) of the affected area are in contact with each other.

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