Threading bone screw

Abstract

The invention discloses a threading bone screw, and relates to the technical field of clinical medicine bone surgery, the threading bone screw comprises a screw body, the screw body is made of a titanium alloy material, one end of the screw body is provided with a telescopic assembly used for changing the number of screw threads, and the telescopic assembly comprises a hollow rod. According to the threading bone screw, when the threading bone screw needs to be used for fixing a fracture part and when a patient with dense sclerotin needs to use the bone screw for fixing a bone, a rotating block is rotated anticlockwise, a hollow rod is driven to cover more threaded rings, and the number of exposed threaded rings of the threading screw is reduced; when a patient with relatively loose sclerotin needs to use the bone screw for fixation, the rotating block is rotated clockwise to drive the hollow rod to move reversely, so that the exposed part of the threaded ring is increased, and the exposed threaded ring of the threading bone screw can be adjusted according to the actual condition of the bone of the patient.

Description

Technical Field

[0001] The invention relates to the technical field of clinical medical bone surgery, in particular to a threadable bone screw. Background Art

[0002] Threadable bone screws are shell fixation nails used for internal fixation of fractures. They are mainly used to provide stable bone support to promote fracture healing. Compared with traditional bone screws, the design of threadable bone screws allows wires to be inserted into or around the screws to further enhance the stability of the fracture site. Threadable bone screws provide an effective and safe fixation option for the treatment of fractures and can significantly increase the possibility of fracture healing.

[0003] Existing bone screws are mainly used to tightly fix the two fractured bones together to promote healing, which helps to restore the normal alignment and function of the bones. In the process of using bone screws to fix the patient's bones, due to the great difference in bone density between different patients, for osteoporotic patients, due to their relatively porous bones, in order to improve the stability of bone setting, bone screws with a large number of thread turns are needed to improve the gripping force of the bone screws. For patients with dense bones, when the number of thread turns of the bone screws is large, the local bone pressure is too large due to the over-tightening of the bones, resulting in micro fractures and bone cracks. Therefore, bone screws with a small number of thread turns are needed. However, since the number of threads of most existing threadable bone screws is fixed, the number of thread turns of the bone screw exposed to the outside cannot be adjusted according to the actual situation of the patient, thereby reducing the practicality of the threadable bone screws.

[0004] Therefore, we propose a threadable bone screw to solve the above problems. Summary of the invention

[0005] The object of the present invention is to provide a threadable bone screw to solve the problem that the thread area of ​​most threadable bone screws mentioned in the above background technology is fixed and cannot be adjusted according to actual conditions, which reduces the practicality.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a threadable bone screw, comprising a screw body, the screw body being made of a titanium alloy material, a telescopic component for changing the number of screw threads being arranged at one end of the screw body, the telescopic component comprising a hollow rod, a mounting head being arranged at an outer surface of the hollow rod near one end, two sliding grooves for the sliding of the hollow rod being arranged on the inner wall of the mounting head, a slider being slidably connected between the insides of the two sliding grooves, a plurality of arc-shaped holes being arranged on an outer surface of one side of the slider, a rotating block being rotatably connected to the inside of the mounting head, a threaded rod being fixedly mounted on the outer surface of the rotating block, and a plurality of positioning rods being fixedly connected to one end of the screw body.

[0007] Preferably, the hollow rod is made of stainless steel, one end of the hollow rod is fixedly connected to the outer surface of the other side of the slider, and one end of the plurality of positioning rods is movably penetrated to the outside of the plurality of arc-shaped holes.

[0008] Preferably, one end of each of the plurality of positioning rods is fixedly connected to the inner wall of the mounting head, and one end of the threaded rod movably penetrates into the interior of the mounting head.

[0009] Preferably, the outer surface of the threaded rod is connected to the inner thread of the slider, and the threaded rod is arranged inside the mounting head.

[0010] Preferably, a threaded ring is fixedly sleeved on the outer surface of the screw body, the outer surface of the threaded ring is slidably connected to the inside of the hollow rod, and the pitch range of the threaded ring is 1.5 mm-3.5 mm.

[0011] Preferably, the threaded ring includes a polylactic acid layer for reducing human body's rejection of foreign matter, and the outer surface of the polylactic acid layer is provided with a polycaprolactone layer for promoting wound healing of patients.

[0012] Preferably, the outer surface of the polycaprolactone layer is provided with a polyglycolic acid layer for preventing secondary damage to the fracture site.

[0013] Preferably, the outer surface of the polyglycolic acid layer is provided with a hydroxy calcium phosphate layer for enhancing the adhesion of cells and bone tissue to the implant screw.

[0014] Preferably, a screw head is fixed to the other end of the screw body, and a threading hole for fixing and limiting the guide wire is opened on the outer surface of one side of the screw head.

[0015] Preferably, the other side outer surface of the screw head is provided with a protective block for buffering the dynamic load borne by the medical screw in the body, and the protective block is made of polyglycolic acid.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. When it is necessary to use threaded bone screws to fix the fracture site, when patients with dense bones need to use bone screws to fix the bones, the rotating block is rotated counterclockwise to drive the hollow rod to cover more thread circles, thereby reducing the number of thread circles of the thread screw exposed to the outside. When patients with relatively loose bones need to use bone screws for fixation, the rotating block is rotated clockwise to drive the hollow rod to move in the opposite direction, so that the part of the thread circle exposed to the outside is increased, so that the thread circle of the threadable bone screw exposed to the outside can be adjusted according to the actual situation of the patient's bones, thereby solving the problem that the thread area of ​​most threadable bone screws in the prior art is fixed and cannot be adjusted according to the actual situation, which reduces the practicality.

[0018] 2. When the bone screw is taken out after the patient's bones have healed, in order to prevent the thread ring from damaging the surrounding soft tissue and bone tissue, during the thread ring processing, a polylactic acid layer, a polycaprolactone layer, a polyglycolic acid layer and a hydroxy calcium phosphate layer are mixed and processed into a thread ring, so that the thread ring has both mechanical strength and mobile biological activity in the early stage of bone fixation, and the absorbable performance of the thread ring is achieved, so that it can fix the human skeleton in the early stage and merge with the human body in the later stage, so that when the bone screw is taken out later, the thread ring has disappeared, which is convenient for taking out the threading bone screw, and effectively preventing the threading bone screw from causing secondary damage to the human body when it is taken out later.

[0019] 3. After the area of ​​the threaded ring of the threading screw exposed on the outside is determined, screw the screw head into the bone segments on both sides of the fracture at the appropriate position, thereby driving the protective block to move forward. The protective block can provide effective auxiliary functions for the bone screw and play a role in buffering external forces. After the threading screw fixes the fracture end, insert the external medical suture into the threading hole, and then wrap the medical suture around the ligament tissue, thereby further improving the fixation effect of the screw body on the fracture end, thereby effectively improving the patient's bone fixation effect.

[0020] 4. In order to further prevent the bone screws from causing secondary damage to the human body during the process of connecting bones, the thread pitch of the thread circles is set so that the bone screws can ensure the fixation force of the bone screws on the bones while avoiding damage to the surrounding tissues. The screw body is made of titanium alloy material and the hollow rod is made of stainless steel, which can be used safely in the body. By setting the material of the threadable bone screws and the thread pitch, it is effectively prevented from penetrating into the bones and causing secondary damage to the human body. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a frontal stereoscopic diagram of a threadable bone screw of the present invention;

[0022] Figure 2A side stereoscopic view of a threadable bone screw according to the present invention;

[0023] Figure 3 It is a sectional stereoscopic view of a screw body portion of a threadable bone screw of the present invention;

[0024] Figure 4 It is a partially cutaway stereoscopic view of the installation head of a threadable bone screw of the present invention;

[0025] Figure 5 It is a partially cutaway stereoscopic view of a threaded bone screw of the present invention;

[0026] Figure 6 It is a three-dimensional diagram of the structure of the slider portion of a threadable bone screw of the present invention;

[0027] Figure 7 It is a partially cutaway stereoscopic view of a telescopic assembly of a threadable bone screw according to the present invention;

[0028] Figure 8 The present invention is a layered diagram of the threaded ring portion of a threadable bone screw.

[0029] In the figure:

[0030] 1. Screw body; 2. Thread ring; 201. Polylactic acid layer; 202. Polycaprolactone layer; 203. Polyglycolic acid layer; 204. Hydroxycalcium phosphate layer; 3. Screw head; 4. Threading hole; 5. Protective block; 6. Telescopic assembly; 601. Hollow rod; 602. Mounting head; 603. Slide groove; 604. Sliding block; 605. Arc hole; 606. Rotating block; 607. Threaded rod; 7. Positioning rod. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the implementation regulations described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] See also Figure 1-8The present invention provides a technical solution: a threadable bone screw, comprising a screw body 1, the screw body 1 is made of titanium alloy material, one end of the screw body 1 is provided with a telescopic component 6 for changing the number of screw threads, the telescopic component 6 comprises a hollow rod 601, an outer surface of the hollow rod 601 is provided with a mounting head 602 near one end, the inner wall of the mounting head 602 is provided with two sliding grooves 603 for sliding of the hollow rod 601, a slider 604 is slidably connected between the insides of the two sliding grooves 603, a plurality of arc-shaped holes 605 are provided on the outer surface of one side of the slider 604, and a rotating block 606 is rotatably connected inside the mounting head 602 A threaded rod 607 is fixedly installed on the outer surface of the rotating block 606, and one end of the screw body 1 is fixedly connected to a plurality of positioning rods 7. The hollow rod 601 is made of stainless steel, and one end of the hollow rod 601 is fixedly connected to the outer surface of the other side of the slider 604. One ends of the plurality of positioning rods 7 are respectively movably penetrated to the outside of the plurality of arc holes 605, and one ends of the plurality of positioning rods 7 are fixedly connected to the inner wall of the mounting head 602. One end of the threaded rod 607 is movably penetrated to the interior of the mounting head 602, and the outer surface of the threaded rod 607 is threadedly connected to the interior of the slider 604, and the threaded rod 607 is arranged inside the mounting head 602.

[0033] In this embodiment, during surgical procedures, when a patient has a fracture or sports injury, in order to accelerate the healing of the injured bone, the medical staff first needs to partially reset the fracture to restore the fracture ends to a normal anatomical position, and then use threaded bone screws to fix the fracture site. Before bone setting, due to differences in bone density and quality among different patients, when a patient with dense bone needs to use bone screws to fix the bone, in order to avoid excessive compression of the bone due to excessive thread rings 2, resulting in bone fractures, the medical staff can rotate the rotating block 606 counterclockwise, wherein, as shown in FIG. Figure 4As shown, the cross-section of the connection between the rotating block 606 and the mounting head 602 is T-shaped, the purpose of which is to limit the rotating block 606 and facilitate its rotation. The rotating block 606 drives the threaded rod 607 to rotate, and then drives the slider 604 to move along the two slide grooves 603 toward the screw head 3, wherein the two slide grooves 603 both limit the slider 604 to prevent rotation during the movement, and then drive the hollow rod 601 to move along the screw body 1 toward the screw head 3, thereby further covering more thread circles 2 until the number of thread circles 2 exposed to the outside reaches the required value, and the rotation of the rotating block 606 can be stopped. By reducing the number of thread circles 2 of the threading screw exposed to the outside, it can avoid squeezing the bone while ensuring sufficient fixation strength for the bone. When patients with relatively loose bones need to use a joint When the bone screw is fixed, in order to further improve the gripping force of the bone screw in the bone and make the screw better embedded in the bone, the medical staff first rotates the rotating block 606 clockwise to drive the threaded rod 607 to rotate. The rotation of the threaded rod 607 drives the slider 604 to move along the two slide grooves 603 toward the installation head 602. The movement of the slider 604 drives the hollow rod 601 to move forward along the installation head 602, thereby increasing the portion of the threaded circle 2 exposed to the outside, until the number of threads of the bone screw exposed to the outside reaches the required value, thereby increasing the thread area of ​​the threaded bone screw exposed to the outside. By increasing the number of threads of the threaded circle 2, the bone screw is better embedded in the bone, just like using a nail with more threads in soft soil, which can make the bone screw more firmly fix the bone with relatively loose bone. Figure 1 As shown, the end point of the hollow rod 601 is arc-shaped, the purpose of which is to improve the smoothness of the contact point between the hollow rod 601 and the threaded ring 2, so as to facilitate the insertion of the threadable bone screw into the human bone, so that it can be fixed more firmly, just like using a nail with more threads in soft soil. For patients with dense bones, the thread area can be appropriately reduced to avoid complications such as bone fractures caused by excessive squeezing of the bone, while also ensuring sufficient fixation strength. Through the action of the telescopic component 6, the threaded ring 2 of the threadable bone screw exposed to the outside can be adjusted according to the actual situation of the patient's bones, thereby further improving the diversity of the threadable bone screw and solving the problem that the thread area of ​​most threadable bone screws in the prior art is fixed and cannot be adjusted according to actual conditions, thereby reducing practicality.

[0034] like Figure 1-Figure 6 and Figure 8As shown, the outer surface of the screw body 1 is fixedly sleeved with a thread ring 2, the outer surface of the thread ring 2 is slidably connected to the inside of the hollow rod 601, the pitch range of the thread ring 2 is 1.5mm-3.5mm, the thread ring 2 includes a polylactic acid layer 201 for reducing the body's rejection of foreign matter, the outer surface of the polylactic acid layer 201 is provided with a polycaprolactone layer 202 for promoting wound healing of the patient, the outer surface of the polycaprolactone layer 202 is provided with a polyhydroxyacetic acid layer 203 for preventing secondary injury to the fracture site, and the outer surface of the polyhydroxyacetic acid layer 203 is provided with a hydroxy calcium phosphate layer 204 for enhancing the adhesion of cells and bone tissue to the implanted screw.

[0035] In this embodiment, since the bone screw is provided with an exposed thread ring 2, when the patient's bone heals, the bone screw needs to be removed. Since the surface of the thread ring 2 is uneven, it will rub and pull with the surrounding soft tissue and bone tissue during the movement. This mechanical stimulation can easily cause tissue damage to the patient, and even cause local bleeding and tearing. In order to prevent this phenomenon, during the processing of the thread ring 2, the polylactic acid layer 201, the polycaprolactone layer 202, the polyglycolic acid layer 203 and the hydroxy calcium phosphate layer 204 are mixed and processed into the thread ring 2, so that the thread ring 2 has both mechanical strength and mobile biological activity in the early stage of fixing the bone, thereby improving the healing performance of the implant. Among them, the polylactic acid layer 201 has good biocompatibility and appropriate mechanical strength, and can be gradually absorbed by the body. The polycaprolactone layer 202 is a A polymer with good biocompatibility can be well combined with biological tissues to reduce the body's rejection reaction to implants. The polyglycolic acid layer 203 is a biodegradable material that can be gradually degraded in the human body and eventually absorbed, so that the polyglycolic acid layer 203 implant does not need to be removed by a secondary operation after reaching its function, thereby reducing the patient's pain and the risk of postoperative complications. The hydroxy calcium phosphate layer 204 has excellent biocompatibility, which can reduce the body's rejection reaction to implants and provide a good environment for bone healing. Through the mixture of the above four materials, the absorbable performance of the thread ring 2 is achieved, so that it can fix the human skeleton in the early stage and merge with the human body in the later stage, so that when the bone screw is taken out in the later stage, the thread ring 2 has disappeared, which is convenient for taking out the threading bone screw, and effectively preventing the threading bone screw from causing secondary damage to the human body when it is taken out in the later stage.

[0036] like Figure 1-Figure 6 As shown, a screw head 3 is fixed to the other end of the screw body 1, and a threading hole 4 for fixing and limiting the guide wire is opened on the outer surface of one side of the screw head 3. A protective block 5 for buffering the dynamic load borne by the medical screw in the body is arranged on the outer surface of the other side of the screw head 3. The protective block 5 is made of polyglycolic acid.

[0037] In this embodiment, after the area of ​​the threaded screw's exposed threaded ring 2 is determined, the screw head 3 is screwed into the bone segments on both sides of the fracture at a suitable position, thereby driving the protective block 5 to move forward, wherein the protective block 5 is made of polyglycolic acid material. Polyglycolic acid is an absorbable biomaterial with a relatively fast degradation rate. It can be decomposed by hydrolysis in the body. The initial strength of polyglycolic acid can provide an effective auxiliary function for the bone screw, prevent the bone screw from loosening, and play a role in buffering external forces. In addition, polyglycolic acid can provide a certain space for the surrounding tissues during the degradation process, which is beneficial to the growth and repair of tissues. The movement of the screw head 3 makes the screw The nail body 1, the threaded ring 2 and the hollow rod 601 are inserted into the fracture segment. After the threading screw fixes the fracture end, the external medical suture is inserted into the threading hole 4, and then passes through the soft tissue around the fracture site, so that the medical suture surrounds the ligament tissue. When the limb moves in the later stage, the medical suture can share part of the force generated by the muscle contraction movement, prevent the bone screw from being subjected to excessive tension, and then reduce the load borne by the bone screw alone, thereby further improving the fixation effect of the screw body 1 on the fracture end. Through the protection of the protective block 5 and the cooperation between the medical suture inserted into the threading hole 4, the patient's bone fixation effect is effectively improved.

[0038] like Figure 1-Figure 8 As shown, a thread ring 2 is fixedly sleeved on the outer surface of the screw body 1, and the outer surface of the thread ring 2 is slidably connected to the inside of the hollow rod 601, and the pitch range of the thread ring 2 is 1.5mm-3.5mm.

[0039] In this embodiment, in order to further prevent the bone screw from causing secondary damage to the human body during the process of connecting the bone, the coil spacing of the thread ring 2 is set between 1.5 mm and 3.5 mm, and the coil spacing is maintained within this range, so that the bone screw can ensure the fixation force of the bone screw on the bone while also avoiding damage to the surrounding tissues. The screw body 1 is made of titanium alloy material because titanium has excellent biocompatibility and strength, and is lighter than stainless steel. In addition, titanium alloy has corrosion resistance and excellent mechanical properties, and is less likely to cause allergic reactions in the human body. The hollow rod 601 is made of stainless steel. Stainless steel has good mechanical strength and strong corrosion resistance. Due to its good biocompatibility and antioxidant properties, it will not cause significant rejection reactions in the human body and can be safely used in the body. By setting the material of the threadable bone screw and the thread spacing, it is effectively prevented from penetrating into the bone and causing secondary damage to the human body.

[0040] The method of use and working principle of the device: During surgical medical operations, threaded bone screws can be used as surgical fixation nails. When a patient has a fracture or sports injury, in order to accelerate the healing of the damaged bone, the medical staff first needs to partially reset the fracture to restore the fracture ends to a normal anatomical position, and then use the threaded bone screws to fix the fracture site. Before bone setting, due to differences in bone density and quality among different patients, when a patient with dense bone needs to use bone screws to fix the bone, in order to avoid excessive squeezing of the bone due to too many threaded circles 2, resulting in bone fractures, the medical staff can rotate the rotating block 606 counterclockwise, and the rotating block 606 drives the threaded rod 607 to rotate, thereby driving the slider 604 along the two The slide groove 603 moves toward the screw head 3, thereby driving the hollow rod 601 to move along the screw body 1 toward the screw head 3, thereby further covering more thread circles 2, until the number of thread circles 2 exposed to the outside reaches the required value, and the rotation of the rotating block 606 can be stopped. By reducing the number of thread circles 2 exposed to the outside of the threading screw, it can avoid squeezing the bone while ensuring sufficient fixation strength for the bone. When patients with relatively loose bones need to use bone screws for fixation, in order to further improve the gripping force of the bone screws in the bone and make the screws better embedded in the bone, the medical staff first rotates the rotating block 606 clockwise to drive the threaded rod 607 to rotate, and the rotation of the threaded rod 607 drives the slider 604 moves along the two slide grooves 603 toward the mounting head 602, and the movement of the slider 604 drives the hollow rod 601 to move forward along the mounting head 602, thereby increasing the portion of the threaded ring 2 exposed to the outside, until the number of threads of the bone screw exposed to the outside reaches the required value. By increasing the number of threads 2, the bone screw can be better embedded in the bone and can be fixed more firmly. For patients with dense bones, the thread area can be appropriately reduced to avoid complications such as bone fractures caused by excessive compression of the bone, while also ensuring sufficient fixing strength. When the area of ​​the threaded ring 2 exposed to the outside of the threading screw is determined, the screw head 3 is screwed into the bone segments on both sides of the fracture at a suitable position, thereby driving the protective The protective block 5 is made of polyglycolic acid material to prevent the bone screw from loosening. The movement of the screw head 3 allows the screw body 1 and the threaded ring 2 to be inserted into the fracture segment. After the threading screw fixes the fracture end, the external medical suture is inserted into the threading hole 4, and then passes through the soft tissue around the fracture site, so that the medical suture surrounds the ligament tissue. When the limb moves in the later stage, the medical suture can share part of the force generated by the muscle contraction movement, prevent the bone screw from being subjected to excessive tension, and thus reduce the load borne by the bone screw alone. In order to further prevent the bone screw from causing secondary damage to the human body during the process of connecting the bones, the thread pitch of the threaded ring 2 is set at 1.5 mm-3.5 mm, the pitch of the coils is maintained within this interval, so that the bone screw can ensure the fixing force of the bone screw on the bone while avoiding damage to the surrounding tissues. The screw body 1 is made of titanium alloy material because titanium has excellent biocompatibility and strength and is lighter than stainless steel. In addition, titanium alloy has corrosion resistance and excellent mechanical properties, and is less likely to cause allergic reactions in the human body. The hollow rod 601 is made of stainless steel. Stainless steel has good mechanical strength and strong corrosion resistance. Due to its good biocompatibility and antioxidant properties, it will not cause significant rejection reactions in the human body and can be used safely in the body. Since the bone screw is provided with an exposed thread coil 2, when the patient's bone is healed, the bone screw needs to be removed. Since the surface of the thread coil 2 is uneven, it will rub and pull with the surrounding soft tissue and bone tissue during movement. This mechanical stimulation can easily cause tissue damage to the patient and even cause local bleeding and tearing. In order to prevent this phenomenon from occurring, during the processing of the thread coil 2, the polylactic acid layer 201, the polycaprolactone layer 202, the polyglycolic acid layer 203 and the hydroxyphosphorus The calcium phosphate layer 204 is mixed and processed to form the thread ring 2, so that the thread ring 2 has both mechanical strength and mobile biological activity in the early stage of bone fixation, thereby improving the healing performance of the implant. Among them, the polylactic acid layer 201 has good biocompatibility and appropriate mechanical strength, and can be gradually absorbed by the body. The polycaprolactone layer 202 is a polymer with good biocompatibility, which can be well combined with biological tissues to reduce the body's rejection of implants. The polyhydroxyacetic acid layer 203 is a biodegradable material that can be gradually degraded in the human body and finally absorbed, so that the polyhydroxyacetic acid layer 203 implant does not need to be removed by secondary surgery after reaching its function, thereby reducing the patient's pain and postoperative complications. The calcium phosphate layer 204 has excellent biocompatibility, which can reduce the body's rejection of implants and provide a good environment for bone healing. Through the mixture of the above four materials, the absorbable performance of the thread ring 2 is achieved, so that it can fix the human skeleton in the early stage and merge with the human body in the later stage, so that when the bone screw is removed in the later stage, the thread ring 2 has disappeared, which is convenient for removing the threading bone screw. .

[0041] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A threadable bone screw, comprising a screw body (1), wherein the screw body (1) is made of a titanium alloy material, and is characterized in that: A telescopic component (6) for changing the number of screw threads is arranged at one end of the screw body (1), and the telescopic component (6) comprises a hollow rod (601), and a mounting head (602) is arranged near one end of the outer surface of the hollow rod (601), and the inner wall of the mounting head (602) is provided with two sliding grooves (603) for sliding the hollow rod (601), and a slider (604) is slidably connected between the insides of the two sliding grooves (603), and a plurality of arc-shaped holes (605) are arranged on the outer surface of one side of the slider (604), and a rotating block (606) is rotatably connected inside the mounting head (602), and a threaded rod (607) is fixedly installed on the outer surface of the rotating block (606), and a plurality of positioning rods (7) are fixedly connected to one end of the screw body (1).

2. The threadable bone screw according to claim 1, characterized in that: The hollow rod (601) is made of stainless steel, one end of the hollow rod (601) is fixedly connected to the outer surface of the other side of the slider (604), and one end of the plurality of positioning rods (7) is movably penetrated to the outside of the plurality of arc-shaped holes (605).

3. The threadable bone screw according to claim 2, characterized in that: One end of each of the plurality of positioning rods (7) is fixedly connected to the inner wall of the mounting head (602), and one end of the threaded rod (607) is movably inserted into the interior of the mounting head (602).

4. The threadable bone screw according to claim 3, characterized in that: The outer surface of the threaded rod (607) is connected to the inner thread of the slider (604), and the threaded rod (607) is arranged inside the mounting head (602).

5. The threadable bone screw according to claim 4, characterized in that: The outer surface of the screw body (1) is fixedly sleeved with a thread ring (2), the outer surface of the thread ring (2) is slidably connected to the inside of the hollow rod (601), and the pitch of the thread ring (2) is in the range of 1.5 mm to 3.5 mm.

6. The threadable bone screw according to claim 5, characterized in that: The threaded ring (2) comprises a polylactic acid layer (201) for reducing the human body's rejection of foreign matter, and the outer surface of the polylactic acid layer (201) is provided with a polycaprolactone layer (202) for promoting wound healing of patients.

7. The threadable bone screw according to claim 6, characterized in that: The outer surface of the polycaprolactone layer (202) is provided with a polyglycolic acid layer (203) for preventing secondary damage to the fracture site.

8. The threadable bone screw according to claim 7, characterized in that: The outer surface of the polyglycolic acid layer (203) is provided with a hydroxy calcium phosphate layer (204) for enhancing the adhesion of cells and bone tissue to the implant screw.

9. The threadable bone screw according to claim 8, characterized in that: A screw head (3) is fixed to the other end of the screw body (1), and a threading hole (4) for fixing and limiting the guide wire is provided on an outer surface of one side of the screw head (3).

10. The threadable bone screw according to claim 9, characterized in that: The other outer surface of the screw head (3) is provided with a protective block (5) for buffering the dynamic load borne by the medical screw in the body, and the protective block (5) is made of polyglycolic acid.

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