Pedicle screw for osteoporosis patient

Abstract

The pedicle screw for the osteoporosis patient comprises a screw body with external threads, a containing cavity extending in the axial direction of the screw body is formed in the screw body, and groove holes which are symmetrically distributed and communicated with the containing cavity are formed in the outer surface of the screw body; a distraction pile, an inner core assembly and an extrusion nut are sequentially arranged in the containing cavity from the head end to the tail end of the nail body. The tail end of the nail body is provided with a spherical table integrally formed with the nail body, and the containing cavity of the nail body extends and penetrates to the center of the spherical table. The outer surface of the spherical table is movably sleeved with a fixing assembly used for fixing a titanium rod. According to the pedicle screw, the inner core assembly and the extrusion nut are arranged in the containing cavity of the screw body, so that the extrusion nut can promote the anchoring piece of the inner core assembly to extend out of the slotted hole when bearing the acting force in the axial direction of the screw body, and the connecting force between the pedicle screw and the spine is enhanced; the vertebral pedicle screw has good stability in the using process, is easy and convenient to operate, and can greatly reduce damage to a patient when the vertebral pedicle screw is implanted into the spine.

Description

Technical Field

[0001] The invention relates to the technical field of pedicle screws, and in particular to a pedicle screw for osteoporosis patients. Background Art

[0002] Osteoporosis is a disease characterized by decreased bone mass and deterioration of bone microarchitecture.

[0003] Spinal fractures, tumors, degeneration and other diseases seriously threaten human health. Open decompression and internal fixation technology is widely used in the treatment of the above diseases. This technology often requires pedicle screws for fusion fixation of the surgical site. However, traditional pedicle screws often have complications such as screw loosening and pullout in osteoporosis patients, and secondary surgery is required in severe cases. Although bio-coated screws, expandable pedicle screws, and bone cement screws are currently clinically used for fixation treatment of osteoporosis patients, the following defects still exist: (1) After implantation, bio-coated screws need to achieve bony healing between the coating and the surrounding bone to achieve a better stabilization effect, and there are defects such as inability to achieve immediate stability, coating wear and peeling during the implantation process; (2) After implantation, expandable pedicle screws pull the inner core to cause the distal end of the screw to bifurcate or the middle of the screw to swell, which achieves an immediate stabilization effect, but there are disadvantages such as poor screw strength, poor torsional stability after implantation, and inability to achieve bony fusion with the surrounding bone; (3) After implantation, bone cement screws inject bone cement into the screw to achieve an immediate stabilization effect through the diffusion of bone cement, but there are disadvantages such as bone cement leakage, inconvenience in bone cement injection, and inability of bone cement to achieve bony fusion with the surrounding bone.

[0004] The Chinese utility model patent application with the announcement number CN221060816U discloses an expandable pedicle screw, including a bone screw, an expansion component, and an adjustment component; the bone screw is provided with a connected accommodating cavity and a through hole, the bone screw includes a screw head and a threaded portion connected in sequence up and down, the through hole is arranged on the outer peripheral surface of the threaded portion, the accommodating cavity extends up and down and passes through the screw head, and the inner peripheral surface of the accommodating cavity is provided with an internal threaded portion; the expansion component is arranged in the accommodating cavity, and the expansion component has an opening portion that can enter and exit the through hole; the upper end of the adjustment component is movably connected to the internal threaded portion, and the lower end of the adjustment component can abut against the expansion component to drive the opening portion to extend out of the through hole. The pedicle screw has the advantages of strong binding force and a large expansion adjustment range, which can enhance the fixed connection between the expandable pedicle screw and the bone; but the expansion range of the expandable pedicle screw is small, the holding force of the opening portion is weak, the anti-rotation stability is insufficient, and the ability of the opening portion to combine with the surrounding bone in the later stage is limited, which is not conducive to long-term stability. Summary of the invention

[0005] In order to overcome the deficiencies of the above-mentioned prior art, the purpose of the present invention is to provide a pedicle screw for patients with osteoporosis, by arranging an inner core component and an extrusion nut that can move along the axial direction of the nail body in the accommodating cavity of the nail body, combined with the slot hole, the support pile and the rectangular groove and the internal thread arranged on the inner surface of the accommodating cavity, when the extrusion nut is subjected to the force along the axial direction of the nail body, the anchor plate of the inner core component can be prompted to extend out of the slot hole, thereby strengthening the connection force between the pedicle screw and the spine and preventing the pedicle screw from loosening in the spine; at the same time, a rotatable fixing component is arranged at the tail end of the nail body, which helps to correct the direction of the titanium rod when connecting multiple pedicle screws; the present invention has good stability and is easy to operate during use, and can greatly reduce the damage to the patient caused by the implantation of the pedicle screw in the spine.

[0006] In order to achieve the above object, the technical solution adopted by the present invention is:

[0007] A pedicle screw for osteoporosis patients, comprising a nail body 2 with an external thread 1, wherein the nail body 2 is provided with a receiving cavity 21 extending along its axial direction, and the outer surface of the nail body 2 is provided with symmetrically distributed slots 22 connected to the receiving cavity 21; in the receiving cavity 21, a support pile 3, an inner core component 4, and an extrusion nut 5 are sequentially arranged from the head end to the tail end of the nail body 2; the tail end of the nail body 2 is provided with a spherical table 6 integrally formed therewith, and the receiving cavity 21 of the nail body 2 extends and penetrates to the center of the spherical table 6; the outer surface of the spherical table 6 is movably sleeved with a fixing component 7 for fixing a titanium rod.

[0008] Furthermore, the inner surface of the accommodating cavity 21 is provided with a rectangular groove 23 adapted to the inner core component 4 .

[0009] Furthermore, the inner core component 4 includes two anchor plates 41 and a sliding push rod 42 that are adapted to the slot hole 22; one end of the anchor plate 41 is rotatably connected to the sliding push rod 42, and the other end of the anchor plate 41 is adapted to the support pile 3; one end of the sliding push rod 42 away from the anchor plate 41 is in contact with the extrusion nut 5, and the anchor plate 41 can be urged to enter and exit the slot hole 22 by applying an axial force to the extrusion nut 5 along the axial direction of the nail body 2.

[0010] Furthermore, the anchoring sheet 41 includes a sheet body 411, a rotating sheet 412 is provided at one end of the sheet body 411, a cylindrical groove 413 is provided at the center of the rotating sheet 412, and the rotational connection between the anchoring sheet 41 and the sliding push rod 42 is realized through the cylindrical groove 413; the other end of the sheet body 411 is provided with an arc surface 414 adapted to the support pile 3, and the side of the sheet body 411 away from the arc surface 414 is provided with an arc top 415 adapted to the rectangular groove 23; the surface of the sheet body 411 is provided with a porous structure 416 and a bone-promoting coating 417.

[0011] Furthermore, the sliding push rod 42 includes a rod body 421, one end of which is provided with an arc groove 422 that is compatible with the rotating piece 412, and a rotating base 423 with a cylindrical groove 424 is provided in the arc groove 422, and a rotating shaft 425 is movably inserted in the cylindrical groove 424; the rotating pieces 412 are movably inserted through the cylindrical groove 1 413 at both ends of the rotating shaft 425, and the rotating pieces 412 are symmetrically distributed on both sides of the rotating base 423; the other end of the rod body 421 is provided with a circular protrusion 426 that is compatible with the accommodating cavity 21, and the circular protrusion 426 is symmetrically distributed on both sides of the rod body 421 along the axial direction of the rotating shaft 425; the rod body 421 is symmetrically provided with rectangular protrusions 427 that are compatible with the rectangular groove 23 on both sides perpendicular to the axial direction of the rotating shaft 425.

[0012] Furthermore, the inner surface of the accommodating cavity 21 is provided with an internal thread 24 adapted to the extrusion nut 5 .

[0013] Furthermore, the extrusion nut 5 includes a solid screw body 51, one side of the screw body 51 is provided with a smooth surface abutting against the sliding push rod 42, and the other side of the screw body 51 is provided with an inner hexagonal groove 52; the outer surface of the screw body 51 is provided with a thread 53 adapted to the internal thread 24.

[0014] Furthermore, the fixing assembly 7 includes an arcuate shell 71 movably mounted on the outer surface of the spherical table 6, and two fixing arms 72 are symmetrically arranged on the side of the arcuate shell 71 away from the nail body 2; the arcuate shell 71 and the two fixing arms 72 form a U-shaped groove, and a cavity for accommodating the titanium rod is formed in the middle; a second thread 721 is arranged on the side opposite to each other of the two fixing arms 72, and the two fixing arms 72 are connected with a fixing nut 73 through the second thread 721.

[0015] Furthermore, the fixing nut 73 includes a solid second screw body 731 , the outer surface of the second screw body 731 is provided with a third thread 732 matched with the second thread 721 , and a second hexagonal groove 733 is provided on the side of the second screw body 731 away from the spherical table 6 .

[0016] Furthermore, the rotation direction of the external thread 1 is opposite to that of the internal thread 24 ; the rotation direction of the external thread 1 is the same as that of the second thread 721 .

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] 1. The present invention arranges an inner core assembly 4 and an extrusion nut 5 that can move axially along the nail body 2 in the accommodation cavity 21 of the nail body 2, and combines the slot 22, the support pile 3, and the rectangular groove 23 and the internal thread 24 arranged on the inner surface of the accommodation cavity 21. When the extrusion nut 5 is subjected to the force acting along the axial direction of the nail body 2, the anchoring piece 41 of the inner core assembly can be urged to extend out of the slot 22, thereby strengthening the connection force between the pedicle screw and the spine, and preventing the pedicle screw from loosening in the spine, causing secondary damage to the patient. At the same time, due to the coordinated use of the rectangular groove 23 and the inner core assembly 4, the inner core assembly 4 does not flip when moving axially, ensuring that the anchoring piece 41 of the inner core assembly 4 smoothly extends out of the slot 22, and has immediate stability against dislodging and rotation.

[0019] 2. The present invention is provided with a rotatable fixing assembly 7, which helps to correct the direction of the titanium rod when connecting multiple pedicle screws, thereby improving the stability and efficiency of connecting multiple pedicle screws to the titanium rod.

[0020] 3. In the present invention, during the process of the entire pedicle screw being screwed into the appropriate position of the vertebral body along the pedicle according to the pre-designed screw track, the anchoring sheet 41 is hidden in the accommodating cavity 21, and will not affect the entire pedicle screw implantation process, thereby enhancing the strength of the entire pedicle screw and reducing the risk of fatigue and fracture of the hollow screw; after the entire pedicle screw reaches the appropriate position of the vertebral body, the anchoring sheet 41 is stretched open, and the porous structure 416 and the bone-promoting coating 417 provided on the anchoring sheet 41 can fuse with the surrounding bone, which helps the surrounding bone of the implanted spine to grow into, and can further improve the bone integration performance.

[0021] In summary, the present invention arranges an inner core component 4 and an extrusion nut 5 that can move axially along the nail body 2 in the accommodating cavity 21 of the nail body 2, and combines the slotted hole 22, the support pile 3, and the rectangular groove 23 and the internal thread 24 arranged on the inner surface of the accommodating cavity 21. When the extrusion nut 5 is subjected to the force acting along the axial direction of the nail body 2, the anchoring piece 41 of the inner core component can be prompted to extend out of the slotted hole 22, thereby strengthening the connection force between the pedicle screw and the spine and preventing the pedicle screw from loosening in the spine; at the same time, during the implantation of the pedicle screw, the anchoring piece 41 is hidden in the accommodating cavity 21, thereby ensuring the stability and smoothness of the pedicle screw implantation process; in addition, a rotatable fixing component 41 is arranged at the tail end of the nail body 2 through a spherical table 6, which helps to correct the direction of the titanium rod when connecting multiple pedicle screws, thereby improving the stability and efficiency of the connection of multiple pedicle screws; the pedicle screw of the present invention has good stability and is easy to operate during use, and can greatly reduce the damage of the pedicle screw implanted in the spine to the patient. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the structural disassembly of the present invention.

[0023] Figure 2 It is a schematic diagram of the structure of the anchor sheet 41 of the present invention when it is not expanded.

[0024] Figure 3 It is a schematic diagram of the structure of the anchor sheet 41 of the present invention in the expanded state.

[0025] Figure 4 It is a sagittal cross-sectional view of the overall structure of the present invention.

[0026] Figure 5 The sagittal section of the local structure of the present invention Figure 1 .

[0027] Figure 6 It is a partial structural oblique view of the present invention.

[0028] Figure 7 The sagittal section of the local structure of the present invention Figure 2 .

[0029] Figure 8 It is a schematic structural diagram of the inner core component 4 of the present invention.

[0030] Fig. 9 The structure of the anchor sheet 41 of the present invention is shown in FIG. Figure 1 .

[0031] Fig.10 The structure of the anchor sheet 41 of the present invention is shown in FIG. Figure 2 .

[0032] Fig.11 The structure of the sliding push rod 42 of the present invention is shown in FIG. Figure 1 .

[0033] Fig.12 The structure of the sliding push rod 42 of the present invention is shown in FIG. Figure 2 .

[0034] Fig.13 It is a schematic structural diagram of the extrusion nut 5 of the present invention.

[0035] Fig.14 It is a schematic structural diagram of the fixing nut 73 of the present invention.

[0036] In the figure: 1, external thread; 2, nail body; 21, accommodating cavity; 22, slot hole; 23, rectangular groove; 24, internal thread; 3, open pile; 4, inner core assembly; 41, anchoring sheet; 411, sheet body; 412, rotating sheet; 413, cylindrical groove 1; 414, arc surface; 415, arc top; 416; porous structure; 417, osteosynthesis coating; 42, sliding push rod; 421, rod body; 422, arc groove ; 423, rotating base; 424, cylindrical groove two; 425, rotating shaft; 426, circular protrusion; 427, rectangular protrusion; 5, extrusion nut; 51, screw body one; 52, hexagonal groove one; 53, thread one; 6, spherical table; 7, fixing component; 71, arc shell; 72, fixing arm; 721, thread two; 73, fixing nut; 731, screw body two; 732, thread three; 733, hexagonal groove two. DETAILED DESCRIPTION

[0037] The present invention will be further described in detail below in conjunction with the accompanying drawings.

[0038] See also Figure 1-5 A pedicle screw for osteoporosis patients, comprising a nail body 2 with an external thread 1, wherein the nail body 2 is provided with a receiving cavity 21 extending along its axial direction, and the outer surface of the nail body 2 is provided with symmetrically distributed slots 22 connected with the receiving cavity 21; in the receiving cavity 21, a support pile 3, an inner core component 4, and an extrusion nut 5 are sequentially arranged from the head end to the tail end of the nail body 2; the tail end of the nail body 2 is provided with a spherical table 6 integrally formed therewith, and the receiving cavity 21 of the nail body 2 extends and penetrates to the center of the spherical table 6; the outer surface of the spherical table 6 is movably sleeved with a fixing component 7 for fixing a titanium rod.

[0039] In this embodiment, an inner core component 4 and an extrusion nut 5 that can move axially along the nail body 2 are arranged in the accommodating cavity 21 of the nail body 2. When the extrusion nut 5 is subjected to a force acting along the axial direction of the nail body 2, the expanded portion of the inner core component can be pushed out of the slot 22; after the pedicle screw of this embodiment is delivered to a suitable position of the vertebral body, the expanded portion of the inner core component 4 can be controlled to extend out of the slot 22, so that the inner core component 4 presents Figure 3 The pedicle screw is in a distracted state, thereby strengthening the connection between the pedicle screw and the spine and preventing the pedicle screw from loosening in the spine, causing secondary injury to the patient.

[0040] In actual surgery, multiple pedicle screws need to be set up, so titanium rods are needed to fix and connect the multiple pedicle screws; based on the existing technology, this embodiment sets up a rotatable fixing component 41, which helps to correct the direction of the titanium rod when connecting multiple pedicle screws, thereby improving the efficiency of pedicle screw implantation in the spine.

[0041] See also Figure 6 and Figure 7The inner surface of the accommodating cavity 21 is provided with a rectangular groove 23 adapted to the inner core component 4; this embodiment introduces the rectangular groove 23 by making corresponding improvements to the accommodating cavity 21, so that when the nailing instrument applies an axial force to the extrusion nut 5, the inner core component 4 will not flip over at will and move along the specified direction; at the same time, it can also ensure that the expanded part of the inner core component 4 corresponds to the slot 22, and the expanded part of the inner core component 4 is pushed to expand more steadily and smoothly, reducing the effect on the spine when the pedicle screw is implanted into the spine, and reducing damage to the patient.

[0042] See also Figure 4 and Figure 8 The inner core component 4 includes two anchoring plates 41 and a sliding push rod 42 adapted to the slot hole 22; one end of the two anchoring plates 41 is rotatably connected to the sliding push rod 42, and the other end of the two anchoring plates 41 is adapted to the support pile 3; one end of the sliding push rod 42 away from the anchoring plate 41 is in contact with the extrusion nut 5, and the anchoring plate 41 can be urged to enter and exit the slot hole 22 by applying an axial force to the extrusion nut 5 along the axial direction of the nail body 2.

[0043] In this embodiment, an axial force is applied to the extrusion nut 5 along the head end of the nail body 2, so that the sliding push rod 42, the two anchor plates 41, and the support pile 3 are all subjected to an axial force along the head end of the nail body 2; at this time, the end surface of the support pile 3 will give the two anchor plates 41 an axial force along the tail end of the nail body 2. Since the sliding push rod 42 and the two anchor plates 41 are rotationally connected, the two anchor plates extend out of the slot 22 in a fan shape, thereby strengthening the connection between the entire pedicle screw and the spine.

[0044] See also Fig. 9 and Fig.10 The anchoring sheet 41 includes a sheet body 411, a rotating sheet 412 is provided at one end of the sheet body 411, a cylindrical groove 413 is provided at the center of the rotating sheet 412, and the anchoring sheet 41 is connected to the sliding push rod 42 by rotation through the cylindrical groove 413; the other end of the sheet body 411 is provided with an arc surface 414 adapted to the support pile 3, and the side of the sheet body 411 away from the arc surface 414 is provided with an arc top 415 adapted to the rectangular groove 23; the surface of the sheet body 411 is provided with a porous structure 416 and a bone-promoting coating 417. The material of the bone-promoting coating 417 used in this embodiment is hydroxyapatite, and the hydroxyapatite is arranged around the anchoring sheet 41 by micro-arc oxidation technology, so as to form the bone-promoting coating 417, which is convenient for the surrounding bone growth of the implanted spinal part, and can further improve the bone integration performance.

[0045] See also Fig.11 and Fig.12The sliding push rod 42 includes a rod body 421, one end of which is provided with an arc groove 422 matched with the rotating piece 412, a rotating base 423 with a cylindrical groove 424 is provided in the arc groove 422, and a rotating shaft 425 is movably inserted in the cylindrical groove 424; the rotating pieces 412 are movably inserted through the cylindrical groove 413 at both ends of the rotating shaft 425, and the rotating pieces 412 are symmetrically distributed on both sides of the rotating base 423; the other end of the rod body 421 is provided with a circular protrusion 426 matched with the accommodating cavity 21, and the circular protrusion 426 is symmetrically distributed on both sides of the rod body 421 along the axial direction of the rotating shaft 425; the rod body 421 is symmetrically provided with rectangular protrusions 427 matched with the rectangular groove 23 on both sides perpendicular to the axial direction of the rotating shaft 425.

[0046] In this embodiment, an arc groove 422, a rotating base 423, and a rotating shaft 425 are provided at one end of the sliding push rod 42, which are used in conjunction with the rotating plate 412 of the anchor plate 41, so that the anchor plate 41 can rotate in a fan shape through the rotating shaft 424 when forces are applied to both ends, thereby extending out of the slot 22 to ensure the stability of the pedicle screw after implantation; in addition, the sliding push rod 42 is also provided with a circular protrusion 426 and a rectangular protrusion 427 to ensure the smoothness and stability of the movement of the sliding push rod 42 in the accommodating cavity 21.

[0047] See also Figure 5 and Figure 7 The inner surface of the accommodating cavity 21 is provided with an internal thread 24 matched with the extrusion nut 5 .

[0048] See also Fig.13 The extrusion nut 5 includes a solid screw body 51, one side of the screw body 51 is provided with a smooth surface abutting against the sliding push rod 42, and the other side of the screw body 51 is provided with an inner hexagonal groove 52; the outer surface of the screw body 51 is provided with a thread 53 adapted to the internal thread 24.

[0049] See also Figure 2-7 The fixing assembly 7 includes an arcuate shell 71 movably sleeved on the outer surface of the spherical table 6, and two fixing arms 72 are symmetrically arranged on the side of the arcuate shell 71 away from the nail body 2; the arcuate shell 71 and the two fixing arms 72 form a U-shaped groove, and a cavity for accommodating the titanium rod is formed in the middle; a second thread 721 is arranged on the side opposite to each other of the two fixing arms 72, and the two fixing arms 72 are connected with a fixing nut 73 through the second thread 721.

[0050] This embodiment proposes a rotatable fixing assembly 7, in which an arc-shaped shell 71 is sleeved on the outer surface of the spherical table 7. By rotating the arc-shaped shell 71, the direction of the entire fixing assembly 7 is adjusted, which makes it easier for the titanium rod to connect multiple pedicle screws and improves the surgical efficiency.

[0051] See also Fig.14The fixing nut 73 includes a solid screw body 731, the outer surface of the screw body 731 is provided with a thread 732 matched with the thread 721, and the side of the screw body 731 facing away from the spherical table 6 is provided with an inner hexagonal groove 733, and the fixing nut 73 is locked to the titanium rod through the force exerted by the protrusion of the nailing instrument on the inner hexagonal groove 733.

[0052] The external thread 1 and the internal thread 24 have opposite rotation directions, and the external thread 1 and the second thread 721 have the same rotation direction. In this embodiment, the external thread 1 and the second thread 721 are both in a clockwise direction, while the internal thread 24 is in a counterclockwise direction.

[0053] When using the pedicle screw of the present embodiment, firstly, the entire pedicle screw needs to be screwed into the vertebral body along the pedicle according to the pre-designed screw path. In this process, the protrusion of the screw-in instrument passes through the accommodating cavity 21 located on one side of the spherical table 6 and is aligned with the inner hexagonal groove 52 of the extrusion nut 5. Then, the screw-in instrument is rotated clockwise to firmly fix the screw-in instrument and the fixing arm 72. Since the external thread 1 and the thread 2 721 of the fixing arm 72 have the same rotation direction, they are both subjected to the clockwise rotation force of the screw-in instrument, so that the entire pedicle screw is rotated in the clockwise direction. force, and screw it into the vertebral body along the preset screw channel; although the extrusion nut 5 is also subjected to a certain force in this process, since the rotation direction of the internal thread 24 is opposite to that of the external thread 1 and the second thread 721, it is prevented that the screw-in instrument accidentally pushes the extrusion nut 5 forward when anchoring with the fixed arm 72, so that the anchor plate 41 is not squeezed out in advance; after the pedicle screw reaches the appropriate position of the vertebral body, other screw-in instruments are used to align with the internal hexagonal groove 52 of the extrusion nut 5 and rotate it counterclockwise, thereby expanding the anchor plate 41 and strengthening the connection force between the pedicle screw and the spine.

[0054] The porous structure 415 includes but is not limited to a trabecular structure, a regular porous structure, and a gradient porous structure, and can be set according to the needs of clinical applications.

[0055] The shapes of the hexagonal inner groove 1 52 of the extrusion nut 5 and the hexagonal inner groove 2 732 of the fixing nut 73 include but are not limited to plum blossom-shaped and cross-shaped grooves, which can be set according to the needs of clinical applications.

[0056] The working principle of the present invention is:

[0057] When in use, first select a suitable nailing instrument, pass the raised part of the nailing instrument through the accommodating cavity 21 located on one side of the spherical table 6, and align it with the hexagonal groove 52 of the extrusion nut 5, then rotate the nailing instrument clockwise to firmly fix the nailing instrument and the fixing arm 72, so that the entire pedicle screw is fixed to the nailing instrument; then, by rotating the nailing instrument clockwise, the entire pedicle screw is screwed into the vertebral body along the pedicle according to the pre-designed screw path; after the position performance under C-arm fluoroscopy is good, take out the nailing instrument.

[0058] After the pedicle screw enters the appropriate position of the vertebral body, it is necessary to expand the anchoring plate 41 to strengthen the connection between the pedicle screw and the spine; select a suitable nailing instrument, align the raised part of the nailing instrument with the hexagonal groove 52 of the extrusion nut 5 again, and rotate the extrusion nut 5 counterclockwise, so that the sliding push rod 42, the two anchoring plates 41, and the expansion pile 3 are all subjected to the axial force along the head end of the nail body 2. The end surface of the expansion pile 3 will give the two anchoring plates 41 an axial force along the tail end of the nail body 2. At this time, the two anchoring plates 41 will be subjected to the force at both ends, thereby being squeezed out of the slot 22; after the position performance under C-arm fluoroscopy is good, take out the nailing instrument.

[0059] Finally, the bent titanium rod is placed in the cavity between the fixing arms 72, and a suitable nailing instrument is selected again to fix the titanium rod in the cavity between the fixing arms 72 by rotating the fixing nut 73, so that the titanium rod is firmly connected to the entire pedicle screw.

[0060] The above embodiments are merely detailed descriptions of the present invention, but the present invention is not limited to the above embodiments. Any modifications, substitutions and changes made to the present invention within the spirit of the present invention and the protection scope of the claims are within the protection scope of the present invention.

Claims

1. A pedicle screw for osteoporosis patients, comprising a screw body (2) with an external thread (1), characterized in that: The nail body (2) is provided with a receiving cavity (21) extending along its axial direction, and the outer surface of the nail body (2) is provided with symmetrically distributed slots (22) connected to the receiving cavity (21); the receiving cavity (21) is provided with a support pile (3), an inner core component (4), and an extrusion nut (5) in sequence from the head end to the tail end of the nail body (2); the tail end of the nail body (2) is provided with a spherical table (6) integrally formed therewith, and the receiving cavity (21) of the nail body (2) extends and penetrates to the center of the spherical table (6); the outer surface of the spherical table (6) is movably sleeved with a fixing component (7) for fixing the titanium rod.

2. A pedicle screw for osteoporosis patients according to claim 1, characterized in that: The inner surface of the accommodating cavity (21) is provided with a rectangular groove (23) adapted to the inner core component (4).

3. The pedicle screw for osteoporosis patients according to claim 1, characterized in that: The inner core component (4) comprises two anchoring sheets (41) and a sliding push rod (42) adapted to the slotted hole (22); one end of the anchoring sheet (41) is rotatably connected to the sliding push rod (42), and the other end of the anchoring sheet (41) is adapted to the support pile (3); one end of the sliding push rod (42) away from the anchoring sheet (41) is in contact with the extrusion nut (5), and the anchoring sheet (41) can be urged to enter and exit the slotted hole (22) by applying an axial force to the extrusion nut (5) along the axial direction of the nail body (2).

4. A pedicle screw for osteoporosis patients according to claim 2 or 3, characterized in that: The anchoring sheet (41) comprises a sheet body (411), a rotating sheet (412) is provided at one end of the sheet body (411), a cylindrical groove (413) is provided at the center of the rotating sheet (412), and the anchoring sheet (41) and the sliding push rod (42) are rotatably connected through the cylindrical groove (413); the other end of the sheet body (411) is provided with an arc surface (414) adapted to the support pile (3), and the side of the sheet body (411) facing away from the arc surface (414) is provided with an arc top (415) adapted to the rectangular groove (23); the surface of the sheet body (411) is provided with a porous structure (416) and a bone-promoting coating (417).

5. The pedicle screw for osteoporosis patients according to claim 4, characterized in that: The sliding push rod (42) comprises a rod body (421), one end of the rod body (421) is provided with an arc groove (422) adapted to the rotating piece (412), a rotating base (423) with a cylindrical groove (424) is provided in the arc groove (422), a rotating shaft (425) is movably inserted in the cylindrical groove (424); the two ends of the rotating shaft (425) are movably inserted with the rotating piece (412) through the cylindrical groove (413), and the rotating piece (412) is rotated. The plates (412) are symmetrically distributed on both sides of the rotating base (423); the other end of the rod body (421) is provided with a circular protrusion (426) adapted to the accommodating cavity (21), and the circular protrusion (426) is symmetrically distributed on both sides of the rod body (421) along the axial direction of the rotating shaft (425); the rod body (421) is symmetrically provided with rectangular protrusions (427) adapted to the rectangular groove (23) on both sides perpendicular to the axial direction of the rotating shaft (425).

6. The pedicle screw for osteoporosis patients according to claim 1, characterized in that: The inner surface of the accommodating cavity (21) is provided with an internal thread (24) matched with the extrusion nut (5).

7. A pedicle screw for osteoporosis patients according to claim 1, 3 or 6, characterized in that: The extrusion nut (5) comprises a solid screw body (51), one side of the screw body (51) is provided with a smooth surface that contacts the sliding push rod (42), and the other side of the screw body (51) is provided with an inner hexagonal groove (52); the outer surface of the screw body (51) is provided with a thread (53) that matches the internal thread (24).

8. The pedicle screw for osteoporosis patients according to claim 1, characterized in that: The fixing assembly (7) comprises an arc-shaped shell (71) movably sleeved on the outer surface of the spherical table (6); two fixing arms (72) are symmetrically arranged on the side of the arc-shaped shell (71) away from the nail body (2); the arc-shaped shell (71) and the two fixing arms (72) form a U-shaped groove, and a cavity for accommodating the titanium rod is formed in the middle; a second thread (721) is arranged on the side opposite to each other of the two fixing arms (72), and the two fixing arms (72) are connected to a fixing nut (73) through the second thread (721).

9. The pedicle screw for osteoporosis patients according to claim 8, characterized in that: The fixing nut (73) comprises a solid second screw body (731), the outer surface of the second screw body (731) is provided with a third thread (732) matched with the second thread (721), and the side of the second screw body (731) facing away from the spherical table (6) is provided with a second inner hexagonal groove (733).

10. A pedicle screw for osteoporosis patients according to claim 1, 6 or 8, characterized in that: The external thread (1) and the internal thread (24) have opposite rotation directions; the external thread (1) and the second thread (721) have the same rotation direction.

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