In-vivo self-torsion growth-friendly spinal correction system

Abstract

Disclosed is an in-vivo self-torsion growth-friendly spinal correction system, comprising: an internal fixation rod; first fixation units respectively arranged at both ends of the internal fixation rod; and a torsion assembly comprising a second fixation unit and a rotation assembly. The rotation assembly is wrapped around an outer side of the internal fixation rod. The second fixation unit is arranged in the middle of the rotation assembly, and the two are detachably connected. Both ends of the rotation assembly are connected to the internal fixation rod. The rotation assembly comprises a connecting ring, a connecting block, a first torsion unit, and a second torsion unit. The connecting block is arranged between the first torsion unit and the second torsion unit. One end of the connecting ring is adapted to the connecting block, while the other end is adapted to the second fixation unit. The first torsion unit and the second torsion unit are torsion springs with opposite winding directions. The rotation assembly is connected to a spine by means of the second fixation unit, and a torsional force is applied to the rotation assembly, such that a strong anti-rotational force is applied to the vertebral body by means of the second fixation unit, thereby correcting vertebral body rotation and addressing scoliosis.

Description

In vivo self-torsion growth-friendly spinal correction system

[0001] This application claims priority to the Chinese patent application filed on October 25, 2023, with application number 202311387129.8 and invention name “In vivo self-torsion growth-friendly spinal correction system”. Technical Field

[0002] The present invention belongs to the technical field of medical devices, and in particular relates to a spinal correction device. Background Art

[0003] Early-onset scoliosis (EOS) refers to spinal deformity diagnosed in children before the age of 10. In order to control spinal deformity while preserving the growth potential of the spine and thorax, corrective surgery using growth-friendly spinal implants is required. Growth-friendly spinal implants can preserve the growth potential of the spine and promote spinal growth while correcting spinal deformity. For a spine with scoliosis, the spine usually has both coronal translational deformity and axial rotational deformity. For coronal translational deformity of the spine, a longitudinally expandable growth-friendly spinal implant can provide longitudinal traction through expansion to correct the coronal translational deformity. However, for axial rotational deformity of the spine, the longitudinal traction provided by expansion is very limited to correcting the rotational deformity and is not easy to maintain. Therefore, the current growth-friendly spinal implants cannot meet the derotation needs of spinal rotational deformity.

[0004] In view of the above problems, the present invention provides an in vivo self-torsion growth-friendly spinal correction system.

[0005] Summary of the Invention

[0006] In order to overcome the problems mentioned in the background art, the present invention provides an in vivo self-torsion growth-friendly spinal correction system.

[0007] In-vivo self-torsion growth-friendly spinal correction system, including:

[0008] Internal fixation rod;

[0009] The first fixing units are respectively provided at both ends of the internal fixing rod;

[0010] The torsion assembly includes a second fixing unit and a rotating assembly; the rotating assembly is wrapped around the outside of the internal fixing rod; the second fixing unit is arranged in the middle of the rotating assembly, and the two are detachably connected; both ends of the rotating assembly are connected to the internal fixing rod.

[0011] Furthermore, end caps are respectively provided at both ends of the rotating assembly; the end caps are adapted to the internal fixation rod.

[0012] Furthermore, the rotating assembly includes a connecting ring, a connecting block, a first torsion unit and a second torsion unit; the connecting block is arranged between the first torsion unit and the second torsion unit; one end of the connecting ring is adapted to the connecting block, and the other end is adapted to the second fixing unit.

[0013] Furthermore, the second fixing unit includes a second fixing bolt, a second locking bolt, a nut and a second mounting position; the second fixing bolt is fixedly connected to the second mounting position; one end of the second locking bolt is threadedly connected to the second mounting position, and the other end passes through the connecting ring and is threadedly connected to the nut.

[0014] Furthermore, the second fixing unit includes a second fixing bolt and a second mounting position; the second fixing bolt is fixedly connected to the second mounting position; and one end of the second fixing bolt away from the second mounting position passes through the connecting ring and is connected to the patient's spine.

[0015] Furthermore, the internal fixation rod includes a first fixed end, a connecting portion and a second fixed end; the connecting portion is arranged between the first fixed end and the second fixed end, and the three are fixedly connected; the first fixing unit is connected to the first fixed end and the second fixed end respectively.

[0016] Furthermore, the internal fixation rod also includes a first force-bearing portion and a second force-bearing portion; the first force-bearing portion is arranged between the first fixed end and the connecting portion; the second force-bearing portion is arranged between the second fixed end and the connecting portion; and the end caps are respectively adapted to the first force-bearing portion and the second force-bearing portion.

[0017] Furthermore, the first fixing unit includes a first mounting position, a first fixing bolt, a first locking bolt and an anti-torsion structure; one end of the first fixing bolt is an enlarged end; the enlarged end is stuck inside the first mounting position; the anti-torsion structure is arranged inside the first mounting position; the inner wall of the anti-torsion structure is respectively adapted to the first fixed end and the second fixed end; the first locking bolt is threadedly connected to the first mounting position; the first locking screw presses the internal fixing rod into the inside of the anti-torsion structure, and at the same time the first locking screw presses the anti-torsion structure into the inside of the first mounting position.

[0018] Furthermore, a connecting structure and an extension rod are provided at one end of the internal fixation rod; the extension rod is connected to the internal fixation rod through the connecting structure; a third fixing unit is provided at one end of the extension rod away from the internal fixation rod; the third fixing unit is separate from the extension rod and fixed on the side wall of the extension rod.

[0019] Furthermore, the third fixing unit includes a third fixing bolt, a third locking bolt and a third mounting position; the third mounting position is fixedly connected to the third fixing bolt; the third locking bolt is threadedly connected to the third mounting position; the third locking bolt presses the extension rod against the inner wall of the third mounting position, and uses friction force to lock the relative position relationship between the extension rod and the third fixing unit.

[0020] The beneficial effects of the present invention are as follows: the rotating assembly is connected to the spine through the second fixing unit, and a torsional force is applied to the rotating assembly, and a strong anti-rotational force is applied to the vertebral body through the second fixing unit, thereby correcting vertebral rotation and correcting scoliosis. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] FIG1 is a schematic structural diagram of an in vivo self-torsion growth-friendly spinal correction system implementing the present invention;

[0022] FIG2 is a schematic structural diagram of another embodiment of the in vivo self-torsion growth-friendly spinal correction system of the present invention;

[0023] FIG3 is a schematic structural diagram of a third embodiment of the in vivo self-torsion growth-friendly spinal correction system of the present invention;

[0024] FIG4 is a schematic structural diagram of a fourth embodiment of the in vivo self-torsion growth-friendly spinal correction system of the present invention;

[0025] FIG5 is a schematic structural diagram of an internal fixation rod according to the present invention;

[0026] FIG6 is a schematic diagram of the installation of a first fixing unit and an internal fixing rod according to the present invention;

[0027] FIG7 is a cross-sectional view of a first fixing unit implementing the present invention;

[0028] FIG8 is a schematic diagram of the installation of the third fixing unit and the extension rod according to the present invention;

[0029] FIG9 is a schematic diagram of the installation of a connection structure, an internal fixation rod, and an extension rod according to the present invention;

[0030] FIG10 is a schematic diagram of the installation of the second fixing unit, the connecting ring, and the connecting block according to the present invention;

[0031] FIG11 is a cross-sectional view of a second fixing unit implementing the present invention;

[0032] In the figure, 1. internal fixing rod; 2. torsion assembly; 3. first fixing unit; 4. third fixing unit; 5. connecting structure; 6. extension rod; 11. first fixed end; 12. first force-bearing part; 13. connecting part; 14. second force-bearing part; 15. second fixed end; 21. end cap; 22. second fixing unit; 23. connecting ring; 24. connecting block; 25. first torsion unit; 26. second torsion unit; 31. first mounting position; 32. first fixing bolt; 33. first locking bolt; 34. anti-torsion structure; 41. third fixing bolt; 42. third locking bolt; 51. connecting bracket; 52. limit bolt; 221. second fixing bolt; 222. pressure block; 223. second locking bolt; 224. nut. DETAILED DESCRIPTION

[0033] 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 described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. The present invention can also be implemented or applied through other different specific implementation methods. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0034] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the present invention.

[0035] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature identified as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, "plurality" means two or more, unless otherwise specifically defined.

[0036] Example 1

[0037] The in vivo self-torsion growth-friendly spinal correction system shown in Figure 1-11 includes:

[0038] Internal fixation rod 1;

[0039] The first fixing units 3 are respectively provided at both ends of the internal fixing rod 1; the first fixing units 3 are connected to the internal fixing rod 1;

[0040] The torsion assembly 2 includes a second fixing unit 22 and a rotation assembly (not shown in the figure); the rotation assembly is wrapped around the outside of the internal fixation rod 1; the second fixing unit 22 is set in the middle of the rotation assembly, and the two are detachably connected; both ends of the rotation assembly are connected to the internal fixation rod 1.

[0041] During use, the first fixation unit 3 secures both ends of the patient's scoliotic spine, and the internal fixation rod 1 is mounted on the first fixation unit 3. After applying a torsional force to the rotational assembly, the second fixation unit 22 is fixed to the location where the scoliotic vertebra is most severely rotated. The rotational assembly gradually releases its torsional force, which, through the second fixation unit 22, gradually rotates the location where the scoliotic vertebra is most severely rotated, gradually restoring the spine to its normal state.

[0042] End caps 21 are respectively provided at both ends of the rotating assembly; the end caps 21 are adapted to fit the internal fixation rod 1 .

[0043] Specifically, a polygonal through-hole is provided within the end cap 21, and a first force-bearing portion 12 and a second force-bearing portion 14 are provided on the internal fixation rod 1, adapted to fit the end cap 21. The end caps 21 connect the rotating assembly to the internal fixation rod 1 at both ends, preventing relative rotation between the rotating assembly and the internal fixation rod 1. This prevents the excessive dissipation of the torsional force carried by the rotating assembly, ensuring that the torsional force carried by the rotating assembly can be fully released through the second fixing unit 22 to the location where the scoliosis rotational deformity is most severe, thereby ensuring the therapeutic effect.

[0044] Furthermore, a square through hole is provided inside the end cap 21 .

[0045] As shown in FIG5 , the internal fixation rod 1 includes a first fixed end 11 , a connecting portion 13 and a second fixed end 15 ; the connecting portion 13 is disposed between the first fixed end 11 and the second fixed end 15 , and the three are fixedly connected; the first fixing unit 3 is connected to the first fixed end 11 and the second fixed end 15 respectively.

[0046] The first fixing unit 3 includes a first mounting position 31, a first fixing bolt 32, a first locking bolt 33 and an anti-torsion structure 34; one end of the first fixing bolt 32 is an enlarged end; the enlarged end is stuck inside the first mounting position 31; the anti-torsion structure 34 is arranged inside the first mounting position 31; the inner wall of the anti-torsion structure 34 is respectively adapted to the first fixing end 11 and the second fixing end 15; the first locking bolt 33 is threadedly connected to the first mounting position 31; the first locking bolt 33 presses the internal fixing rod 1 into the anti-torsion structure 34, and at the same time, the first locking bolt presses the anti-torsion structure 34 into the first mounting position 31, and uses friction force to lock the relative position relationship between the internal fixing rod 1 and the first fixing unit 3.

[0047] The internal fixation rod 1 further includes a first force-bearing portion 12 and a second force-bearing portion 14; the first force-bearing portion 12 is arranged between the first fixed end 11 and the connecting portion 13; the second force-bearing portion 14 is arranged between the second fixed end 15 and the connecting portion 13; and the end caps 21 are respectively adapted to the first force-bearing portion 12 and the second force-bearing portion 14.

[0048] Specifically, the first force-bearing portion 12 and the second force-bearing portion 14 are both square prisms adapted to the end cap 21. During use, the internal fixation rod 1 and the end cap 21 will not rotate relative to each other.

[0049] As can be seen from Figures 1-11, the first fixed end 11 and the second fixed end 15 are regular octagonal prisms. A square through-hole is provided within the anti-torsion structure 34. The regular octagonal prism cooperates with the square through-hole within the anti-torsion structure 34 to prevent relative rotation between the internal fixation rod 1 and the first fixation unit 3. Once the first fixation unit 3 is implanted within the patient's spine, there is no rotation between the internal fixation rod 1 and the first fixation unit 3, nor between the internal fixation rod 1 and the end cap 21. This allows the torsional force carried by the rotating assembly to be fully applied through the second fixation unit 22 to the location of the scoliotic apical vertebra with the most severe rotational deformity, thereby enhancing the therapeutic effect.

[0050] As can be seen from Figure 1-11, the rotating assembly includes a connecting ring 23, a connecting block 24, a first torsion unit 25 and a second torsion unit 26; the connecting block 24 is arranged between the first torsion unit 25 and the second torsion unit 26; one end of the connecting ring 23 is adapted to the connecting block 24, and the other end is adapted to the second fixed unit 22.

[0051] Specifically, the first torsion unit 25 and the second torsion unit 26 are torsion springs with opposite rotation directions. The first torsion unit 25 is a torsion spring with a clockwise rotation direction, and the second torsion unit 26 is a torsion spring with a counterclockwise rotation direction. Alternatively, the first torsion unit 25 is a torsion spring with a counterclockwise rotation direction, and the second torsion unit 26 is a torsion spring with a clockwise rotation direction.

[0052] One end of the torsion spring is connected to the end cap 21, and the other end is connected to the connecting block 24. One end of the torsion spring is connected to the internal fixation rod 1 through the end cap 21. The end cap 21 is adapted to the internal fixation rod 1, preventing the torsion spring from releasing its own torsional force toward the end of the end cap 21.

[0053] The ends of the connecting block 24 are connected to the first torsion unit 25 and the second torsion unit 26, respectively. The middle of the connecting block 24 is connected to the connecting ring 23, and the interior of the connecting block 24 is rotatably connected to the internal fixation rod 1. This allows the torsional force carried by the torsion spring to be transmitted through the connecting block 24 to the connecting ring 23, and then through the second fixation unit 22 to the location where the rotational deformity of the apical vertebra of the scoliosis is most severe, gradually restoring the patient's spine to normal.

[0054] Specifically, the connecting ring 23 is provided with an opening that can be opened and deformed to facilitate the installation and disassembly between the connecting ring 23 and the connecting block 24. During use, the second fixing unit 22 will press the opening on the connecting ring 23 to lock the relative position relationship between the connecting ring 23 and the connecting block 24. One end of the connecting ring 23 is wrapped around the outside of the connecting block 24. The contact part between the connecting block 24 and the connecting ring 23 is a hollow regular sixteen-sided prism, and the contact part between the connecting ring 23 and the block is a regular eight-sided through hole. The regular sixteen-sided prism cooperates with the regular eight-sided through hole to prevent the connecting ring 23 and the connecting block 24 from rotating relative to each other, while increasing the connection angle range between the connecting ring 23 and the connecting block 24, thereby enhancing the applicability of the torsion assembly 2 to meet the needs of different patients.

[0055] The second fixing unit 22 includes a second fixing bolt 221, a second locking bolt 223, a nut 224 and a second mounting position (not marked in the figure); the second fixing bolt 221 is fixedly connected to the second mounting position; one end of the second locking bolt 223 is threadedly connected to the second mounting position, and the other end passes through the connecting ring 23 and is threadedly connected to the nut 224.

[0056] In an embodiment of the present application, the second fixing unit 22 further includes a pressure block 222. The pressure block 222 is disposed inside the second mounting position, at the end of the second locking bolt 223 away from the nut 224. The pressure block 222 is rotationally connected to the second locking bolt 223. When the second locking bolt 223 is tightened inside the second mounting position, it squeezes the pressure block 222, which generates a reaction force on the second locking bolt 223, causing the threads on the second locking bolt 223 to fit tightly with the threads inside the second mounting position, thereby strengthening the stability of the connection between the second locking bolt 223 and the second mounting position and effectively preventing the second locking bolt 223 from rotating accidentally.

[0057] During use, the end of the second fixing bolt 221 away from the second mounting position is threadedly connected to the patient's spine. After one end of the second locking bolt 223 is screwed into the end of the second mounting position away from the second fixing bolt 221, the second locking bolt 223 is passed through the end of the connecting ring 23 away from the connecting block 24, and the nut 224 is tightened. This compresses the opening of the connecting ring 23, locking the relative position between the connecting ring 23 and the connecting block 24. At the same time, the connecting ring 23 is fixed between the nut 224 and the second mounting position, locking the relative position between the connecting ring 23 and the second fixing unit 22, so that the torsional force carried by the rotation assembly can be fully applied to the location where the rotational deformity of the apical vertebra of the scoliosis is most severe.

[0058] The working principle of this embodiment is as follows:

[0059] The first fixing bolts 32 are respectively installed at both ends of the patient's scoliotic spine, and the second fixing bolts 221 are installed at the position where the rotational deformity of the apical vertebra of the scoliotic spine is the most severe. Driven by the first torsion unit 25 and the second torsion unit 26, the second fixing bolts 221 rotate around the axis of the internal fixation rod 1 as the axis, driving the part of the apical vertebra of the scoliotic spine with the most severe rotational deformity to rotate, so that the scoliotic part of the spine gradually returns to a normal state.

[0060] The usage of this embodiment:

[0061] 1. Install multiple first fixing bolts 32 to both ends of the patient's scoliotic spine;

[0062] 2. Install the second fixing bolt 221 to the position where the rotational deformity of the apical scoliosis vertebra is most severe;

[0063] 3. Install the rotating assembly and end cap 21 onto the outside of the internal fixation rod 1;

[0064] 4. Install the anti-torsion structure 34 and the internal fixation rod 1 on the first installation position 31 and lock them with the first locking bolt 33;

[0065] 5. Install the pressing block 222 and the second locking bolt 223 into the second installation position; and tighten the second locking bolt 223;

[0066] 6. Apply a torsional force to the first torsion unit 25 and the second torsion unit 26;

[0067] 7. Install the end of the connecting ring 23 away from the connecting block 24 on the second locking bolt 223 and tighten it with the nut 224.

[0068] Example 2

[0069] As shown in FIG2-11 , this embodiment differs from Embodiment 1 in that:

[0070] A connecting structure 5 and an extension rod 6 are provided at one end of the internal fixation rod 1; the extension rod 6 is connected to the internal fixation rod 1 through the connecting structure 5; a third fixing unit 4 is provided at the end of the extension rod 6 away from the internal fixation rod 1; the third fixing unit 4 is separated from the extension rod 6 and fixed on the side wall of the extension rod 6.

[0071] Specifically, the connecting structure 5 includes a connecting bracket 51 and a limiting bolt 52. Two parallel through holes (not marked in the figure) and two threaded holes perpendicular to the through holes (not marked in the figure) are set inside the connecting bracket 51. The internal fixing rod 1 and the extension rod 6 are both compatible with the through holes. The limiting bolts 52 are both compatible with the threaded holes. During use, the internal fixing rod 1 and the extension rod 6 are respectively passed through the connecting bracket 51 through the two through holes, and then the limiting bolts 52 are screwed into the threaded holes so that the limiting bolts 52 contact the side walls of the internal fixing rod 1 and the extension rod 6 respectively, and the internal fixing rod 1 and the extension rod 6 are pressed against the side walls of the through hole. The positional relationship between the internal fixing rod 1 and the connecting structure 5 is locked by friction force, and the positional relationship between the extension rod 6 and the connecting structure 5 is also locked by friction force, thereby locking the positional relationship between the internal fixing rod 1 and the extension rod 6.

[0072] Specifically, the bottom of the limiting bolt 52 is flat. When the limiting bolt 52 contacts the internal fixing rod 1, the bottom of the limiting bolt 52 is in surface contact with the first fixing end 11 or the second fixing end 15, preventing the internal fixing rod 1 and the connecting structure 5 from rotating relative to each other.

[0073] As shown in Figure 8, the third fixing unit 4 includes a third fixing bolt 41, a third locking bolt 42 and a third mounting position (not marked in the figure); the third mounting position is fixedly connected to the third fixing bolt 41; the third locking bolt 42 is threadedly connected to the third mounting position; the third locking bolt 42 presses the extension rod 6 against the inner wall of the third mounting position, and uses friction force to lock the relative position relationship between the extension rod 6 and the third fixing unit 4.

[0074] The usage of this embodiment:

[0075] 1. Install multiple first fixing bolts 32 to both ends of the patient's scoliotic spine;

[0076] 2. Install the second fixing bolt 221 to the position where the rotational deformity of the apical scoliosis vertebra is most severe;

[0077] 3. Install multiple third fixing bolts 41 to appropriate positions;

[0078] 4. Install the rotating assembly and end cap 21 onto the outside of the internal fixation rod 1;

[0079] 5. Install the anti-torsion structure 34 and the internal fixation rod 1 on the first installation position 31 and lock them with the first locking bolt 33;

[0080] 6. Install the extension rod 6 to the third installation position and lock it with the third locking bolt 42;

[0081] 7. Install the pressing block 222 and the second locking bolt 223 into the second installation position; and tighten the second locking bolt 223;

[0082] 8. Apply a torsional force to the first torsion unit 25 and the second torsion unit 26;

[0083] 9. Install the end of the connecting ring 23 away from the connecting block 24 on the second locking bolt 223 and tighten it with the nut 224.

[0084] Example 3

[0085] As shown in FIG3-11 , the difference between this embodiment and embodiments 1 and 2 is that:

[0086] The second fixing unit 22 includes a second fixing bolt 221 and a second mounting position; the second fixing bolt 221 is fixedly connected to the second mounting position; one end of the second fixing bolt 221 away from the second mounting position passes through the connecting ring 23 and is connected to the patient's spine.

[0087] When the second fixing bolt 221 passes through the end of the connecting ring 23 away from the connecting block 24 and is then implanted at the position where the rotational deformity of the apical vertebra of scoliosis is the most severe, the opening on the connecting ring 23 is compressed, locking the relative position relationship between the connecting ring 23 and the connecting block 24. At the same time, the connecting ring 23 is also fixed between the second mounting position and the patient's spine, locking the relative position relationship between the connecting ring 23 and the second fixing unit 22, so that the torsional force carried by the rotating assembly can be fully applied to the position where the rotational deformity of the apical vertebra of scoliosis is the most severe.

[0088] The usage of this embodiment:

[0089] 1. Install multiple first fixing bolts 32 to both ends of the patient's scoliotic spine;

[0090] 2. Install the rotating assembly and end cap 21 onto the outside of the internal fixation rod 1;

[0091] 3. Install the anti-torsion structure 34 and the internal fixation rod 1 on the first installation position 31 and lock them with the first locking bolt 33;

[0092] 4. Apply a torsional force to the first torsion unit 25 and the second torsion unit 26;

[0093] 6. After passing the second fixing bolt 221 through the end of the connecting ring 23 away from the connecting block 24, install it to the position where the rotational deformity of the apical vertebra of the scoliosis is the most severe.

[0094] Alternatively, the method of using this embodiment is:

[0095] 1. Install multiple first fixing bolts 32 to both ends of the patient's scoliotic spine;

[0096] 2. Install multiple third fixing bolts 41 to appropriate positions;

[0097] 3. Install the rotating assembly and end cap 21 onto the outside of the internal fixation rod 1;

[0098] 4. Install the anti-torsion structure 34 and the internal fixation rod 1 on the first installation position 31 and lock them with the first locking bolt 33;

[0099] 5. Install the extension rod 6 to the third installation position and lock it with the third locking bolt 42;

[0100] 6. Apply a torsional force to the first torsion unit 25 and the second torsion unit 26;

[0101] 7. After passing the second locking bolt 223 through the end of the connecting ring 23 away from the connecting block 24, install it to the position where the rotational deformity of the apical vertebra of the scoliosis is the most severe.

[0102] The above shows and describes the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely preferred examples of the present invention and are not intended to limit the present invention. Various changes and improvements may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and improvements fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. An in vivo self-torsion growth-friendly spinal correction system, characterized in that: include: Internal fixation rod; The first fixing units are respectively arranged at two ends of the internal fixing rod; A torsion assembly, comprising a second fixing unit and a rotation assembly; The rotating assembly is wrapped around the outside of the internal fixing rod; the second fixing unit is arranged in the middle of the rotating assembly, and the two are detachably connected; both ends of the rotating assembly are connected to the internal fixing rod; the rotating assembly includes a connecting ring, a connecting block, a first torsion unit and a second torsion unit; the connecting block is arranged between the first torsion unit and the second torsion unit; one end of the connecting ring is adapted to the connecting block, and the other end is adapted to the second fixing unit; the first torsion unit and the second torsion unit are torsion springs with opposite rotation directions.

2. The in vivo self-torsion growth-friendly spinal correction system according to claim 1, characterized in that: End caps are respectively arranged at both ends of the rotating assembly; the end caps are adapted to the internal fixing rod.

3. The in vivo self-torsion growth-friendly spinal correction system according to claim 1, characterized in that: The second fixing unit includes a second fixing bolt, a second locking bolt, a nut and a second mounting position; the second fixing bolt is fixedly connected to the second mounting position; one end of the second locking bolt is threadedly connected to the second mounting position, and the other end passes through a connecting ring and is threadedly connected to the nut.

4. The in vivo self-torsion growth-friendly spinal correction system according to claim 1, characterized in that: The second fixing unit includes a second fixing bolt and a second mounting position; the second fixing bolt is fixedly connected to the second mounting position; and one end of the second fixing bolt away from the second mounting position passes through a connecting ring and is connected to the patient's spine.

5. The in vivo self-torsion growth-friendly spinal correction system according to claim 2, characterized in that: The internal fixing rod includes a first fixing end, a connecting portion and a second fixing end; the connecting portion is arranged between the first fixing end and the second fixing end, and the three are fixedly connected; the first fixing unit is connected to the first fixing end and the second fixing end respectively.

6. The in vivo self-torsion growth-friendly spinal correction system according to claim 5, characterized in that: The internal fixing rod also includes a first force-bearing portion and a second force-bearing portion; the first force-bearing portion is arranged between the first fixed end and the connecting portion; the second force-bearing portion is arranged between the second fixed end and the connecting portion; and end caps are arranged on the first force-bearing portion and the second force-bearing portion.

7. The in vivo self-torsion growth-friendly spinal correction system according to claim 5, characterized in that: The first fixing unit includes a first mounting position, a first fixing bolt, a first locking bolt and an anti-torsion structure; one end of the first fixing bolt is an enlarged end; the enlarged end is stuck inside the first mounting position; the anti-torsion structure is arranged inside the first mounting position; the inner wall of the anti-torsion structure is respectively adapted to the first fixing end and the second fixing end; the first locking bolt is threadedly connected to the first mounting position; the first locking screw presses the internal fixing rod into the anti-torsion structure, and at the same time the first locking screw presses the anti-torsion structure into the first mounting position.

8. The in vivo self-torsion growth-friendly spinal correction system according to claim 4, characterized in that: The second fixing unit also includes a pressing block; the pressing block is arranged inside the second mounting portion and is located at an end of the second locking bolt away from the nut; the pressing block is rotatably connected to the second locking bolt.

9. An in vivo self-torsion growth-friendly spinal correction system, characterized in that: include: Internal fixation rod; The first fixing units are respectively arranged at two ends of the internal fixing rod; A torsion assembly, comprising a second fixing unit and a rotation assembly; The rotating assembly is wrapped around the outside of the internal fixing rod; the second fixing unit is arranged in the middle of the rotating assembly, and the two are detachably connected; both ends of the rotating assembly are connected to the internal fixing rod; the rotating assembly includes a connecting ring, a connecting block, a first torsion unit and a second torsion unit; the connecting block is arranged between the first torsion unit and the second torsion unit; the connecting ring has two mounting rings with mutually perpendicular axes; one end of the connecting ring is adapted to the connecting block, and the other end is adapted to the second fixing unit; the first torsion unit and the second torsion unit are torsion springs with opposite rotation directions.

10. The in vivo self-torsion growth-friendly spinal correction system according to claim 9, characterized in that: The second fixing unit includes a second fixing bolt, a second locking bolt, a nut and a second mounting part; the second fixing bolt is fixedly connected to the second mounting part; one end of the second locking bolt is threadedly connected to the second mounting part, and the other end passes through a connecting ring and is threadedly connected to the nut.

11. The in vivo self-torsion growth-friendly spinal correction system according to claim 9, characterized in that: The first fixing unit includes a first mounting portion, a first fixing bolt, a first locking bolt and an anti-torsion structure; one end of the first fixing bolt is an enlarged end; the enlarged end is stuck inside the first mounting portion; the anti-torsion structure is arranged inside the first mounting portion; the inner wall of the anti-torsion structure is respectively adapted to the first fixing end and the second fixing end; the first locking bolt is threadedly connected to the first mounting portion; the first locking screw presses the internal fixing rod inside the anti-torsion structure.

12. The in vivo self-torsion growth-friendly spinal correction system according to claim 8, characterized in that: A connecting structure and an extension rod are arranged at one end of the internal fixing rod; the extension rod is connected to the internal fixing rod through the connecting structure; a third fixing unit is arranged at one end of the extension rod away from the internal fixing rod; the third fixing unit is separated from the extension rod and fixed on the side wall of the extension rod.

13. The in vivo self-torsion growth-friendly spinal correction system according to claim 12, characterized in that: The third fixing unit includes a third fixing bolt, a third locking bolt and a third mounting portion; the third mounting portion is fixedly connected to the third fixing bolt; the third locking bolt is threadedly connected to the third mounting portion; the third locking bolt presses the extension rod against the inner side wall of the third mounting portion, and uses friction force to lock the relative position relationship between the extension rod and the third fixing unit.

14. The in vivo self-torsion growth-friendly spinal correction system according to claim 12, characterized in that: The connection structure includes a connection bracket and a limiting bolt; two parallel through holes and two threaded holes perpendicular to the through holes are arranged inside the connection bracket; the internal fixing rod and the extension rod are both adapted to the through holes; and the limiting bolts are both adapted to the threaded holes.

15. The in vivo self-torsion growth-friendly spinal correction system according to claim 9, characterized in that: The inner fixing rod comprises a first fixing end, a connecting portion and a second fixing end arranged along an axis; a first fixing unit is arranged on the first fixing end and the second fixing end.

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