Scoliosis correcting device

Abstract

The invention relates to the technical field of medical machinery, and discloses a scoliosis correcting device. The scoliosis correcting device comprises a plurality of pedicle screws and a plurality of connecting rods, the pedicle screws are used for fixing the flexible orthopedic rod together, the flexible orthopedic rod comprises rod bodies and connecting pieces, the rod bodies are movably connected end to end through the connecting pieces, and the included angle formed by the adjacent rod bodies ranges from 160 degrees to 180 degrees. The connecting pieces capable of being movably connected are arranged between the rod bodies to form the flexible orthopedic rod, a certain natural movement range can be kept while the spine is corrected through the flexible orthopedic rod, the spine has the rotation movement freedom degree, a patient can keep a certain stoop ability, and therefore the patient can have the certain stoop ability. Due to the fact that the flexible orthopedic rod has the movement freedom degree among a plurality of conical sections of the spine, the spine can keep a certain movement freedom degree in the correction process, the movement ability of a patient in daily life can be kept, and the patient can better complete stooping, turning and other activities.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, and in particular to a scoliosis correction device. Background Technology

[0002] Scoliosis, a three-dimensional spinal deformity, involves abnormalities in the coronal, sagittal, and axial planes. Its harm escalates with the severity of the deformity. Mild cases may only manifest as uneven shoulders and back, and postural abnormalities. As the Cobb angle increases, pelvic tilt, unequal leg lengths, and decreased height gradually occur. Muscle and joint pain can also result from spinal deformation. Clinically, treatment for scoliosis is categorized as mild (Cobb angle > 10°–40°), moderate (Cobb angle > 40°–60°), moderate to severe (Cobb angle > 60°–80°), and severe (Cobb angle > 80°). Mild cases are primarily treated non-surgically, while moderate and moderate to severe cases require surgical intervention, depending on the patient's skeletal maturity. Severe cases require surgical correction because the thoracic cavity is severely compressed and deformed, reducing its volume and compressing the heart and lungs.

[0003] Clinically, scoliosis surgery is mainly divided into non-fusion and fusion surgeries. The core advantage of non-fusion surgery is that it corrects the deformity while preserving spinal growth space and some mobility, making it suitable for early intervention or patients whose bones are not yet fully developed. Fusion surgery is currently the main clinical approach to radically cure scoliosis, encompassing various techniques such as posterior fusion, combined anterior and posterior fusion, hemiepiphyseal block on the convex side, and hemi-segmentectomy. Fusion surgeries, including but not limited to posterior fusion with or without instrumentation, combined anterior and posterior fusion, combined anterior and posterior hemiepiphyseal block on the convex side, and hemi-segmentectomy, can all result in spinal rigidity and limited mobility, potentially leading to postoperative complications such as incomplete bone graft fusion and curvature at the fusion site. Furthermore, current instruments cannot be adjusted for flexibility, making it difficult to adapt to individual patient anatomical differences.

[0004] Therefore, it is essential to provide a scoliosis correction device to address the shortcomings of existing technologies. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of existing technologies and provide a scoliosis correction device. This scoliosis correction device can retain a certain natural range of motion, the spine has a degree of freedom of rotation, the patient can maintain a certain degree of bending ability, and it can also extend and retract according to the actual condition of the spine.

[0006] The above-mentioned objectives of the present invention are achieved through the following technical measures:

[0007] This invention provides a scoliosis correction device, which includes multiple pedicle screws and a flexible orthotic rod. The multiple pedicle screws are used to fix the flexible orthotic rod together. The flexible orthotic rod includes a rod body and a connector. The multiple rod bodies are movably connected end to end by the connector. The included angle formed by adjacent rod bodies is in the range of 160° to 180°.

[0008] Furthermore, the connector includes a hinge housing and a first ball joint rod. Both ends of the hinge housing are provided with spherical through grooves or first spherical cavities that match the first ball joint rod. The hinge housing is connected to the rod body through the first ball joint rod.

[0009] Furthermore, the pedicle screw includes a screw body and a screw head, the screw head being disposed on the screw body, the screw head having a first through hole adapted to the size of the hinge housing, and the hinge housing being located at the first through hole.

[0010] Furthermore, the pedicle screw includes a screw body, a screw head, and a second ball head rod. The hinge housing also has a second spherical cavity. One end of the second ball head rod has a ball head that matches the second spherical cavity, and the other end of the second ball head rod is disposed on the screw head. The screw head is disposed on the screw body.

[0011] Furthermore, the first ball head is perpendicular to the nail body.

[0012] Furthermore, the connector includes a hinge housing and a first ball joint. The hinge housing has a first spherical cavity, and the first ball joint is adapted to the first spherical cavity. The first ball joint and the hinge housing are respectively disposed at both ends of the rod body. Furthermore, the hinge housing has a limiting groove that communicates with the first spherical cavity, and the limiting groove is used to limit the rotation range of the first ball joint.

[0013] Furthermore, the limiting groove restricts the rotatable angle range of the first ball joint to 0° to 20°.

[0014] Furthermore, the connector includes a pin seat and a pin, the pin seat has a pin hole for mounting the pin, the pin is located at the pin hole, and a plurality of the connectors are provided between the pedicle screws, with adjacent pins perpendicular to each other.

[0015] Furthermore, the pedicle screw includes a screw body, a screw seat, and a fastening stud. The screw body is rotatably connected to the inner bottom end of the screw seat. The threaded section of the screw body is located below the screw seat. Symmetrical through slots are provided on both sides of the screw seat, and a threaded groove is provided on the inner side of the top of the screw seat. The fastening stud is threadedly connected to the threaded groove, and the rod body is sandwiched between the screw body and the fastening stud.

[0016] Preferably, the rod is a telescopic rod.

[0017] Preferably, the retractable rod body is provided with an outer joint rod, an inner joint rod, and a locking member for locking the relative position of the inner joint rod and the outer joint rod. The inner joint rod is movably fitted inside the outer joint rod, and the locking member is movably assembled to the outer joint rod.

[0018] Preferably, the surface of the locking member is provided with protruding teeth.

[0019] Preferably, one end of the inner joint bar has a ratchet tooth integrally connected to its outer surface, which matches the convex tooth. The end connected to the ratchet tooth is defined as the first working end. The first working end is telescopically fitted inside the outer joint bar. The locking member is movably assembled to the outer joint bar, and the convex tooth engages with the ratchet tooth.

[0020] Preferably, the external joint bar is provided with a second through hole for exposing the ratchet and an assembly area for assembling with the locking member. The second through hole is located inside the assembly area, the locking member is movably assembled in the assembly area, and the ratchet extends to the assembly area through the second through hole.

[0021] Preferably, the locking element is an elastic pawl, which is movably fitted inside the assembly area.

[0022] When the length of the retractable rod is adjusted, the elastic pawl is compressed, thereby separating the convex tooth from the ratchet tooth, adjusting the position of the inner joint rod, and then the elastic pawl is restored, and the convex tooth engages with the ratchet tooth, thereby locking the positions of the inner joint rod and the outer joint rod.

[0023] In another preferred embodiment, the locking element is a closely spaced toothed cam, which is rotatably connected to the assembly area.

[0024] When adjusting the length of the telescopic rod, the closely spaced cam is rotated, thereby separating the convex tooth from the ratchet tooth, adjusting the position of the inner joint rod, and then the closely spaced cam is restored, and the convex tooth engages with the ratchet tooth, thereby locking the positions of the inner joint rod and the outer joint rod.

[0025] Preferably, the locking element is a locking knob, which is fitted onto the outer surface of the outer joint bar and is threadedly connected to the outer joint bar.

[0026] Preferably, one end of the outer joint bar is integrally connected with an external thread that matches the locking knob, and the end connected with the external thread is defined as the second working end, and the inner joint bar is telescopically fitted inside the second working end.

[0027] Preferably, the end of the second working end is provided with a plurality of longitudinal slits, and the inner surface of the second working end is integrally connected with teeth.

[0028] Preferably, the end of the second working end is provided with a plurality of longitudinal slits, and the inner surface of the second working end is integrally connected with teeth, and the ratchet of the inner joint bar engages with the teeth.

[0029] When adjusting the length of the retractable rod, rotate the locking knob to the outside of the second working end to adjust the position of the inner joint rod, and then rotate the locking knob to the end of the second working end to lock the positions of the inner joint rod and the outer joint rod.

[0030] Preferably, the connector is provided with a collar and a rotating ring, the rotating ring being rotatably fitted inside the collar, and the pedicle screw passing through the rotating ring.

[0031] Preferably, the collar is provided with an opening, and the rotating ring is a closed circular ring.

[0032] This invention discloses a scoliosis correction device. By incorporating movable connectors between the rods to form a flexible orthotic rod, the spinal column is corrected using this flexible orthotic rod while retaining a certain range of natural motion. The spine has rotational freedom of movement, allowing the patient to maintain a certain degree of bending ability. Because the flexible orthotic rod has a certain degree of freedom of movement between multiple vertebrae of the spine, the scoliosis correction device can more accurately adapt to the patient's spinal curvature. The spine retains a certain degree of freedom of movement during the correction process, preserving the patient's mobility in daily life and enabling them to better perform activities such as bending and turning. This scoliosis correction device, by incorporating movable connectors between the rods to form a flexible orthotic rod, allows the spine to be corrected using this flexible orthotic rod while retaining a certain range of natural motion. The spine has rotational freedom of movement, allowing the patient to maintain a certain degree of bending ability. Because the flexible orthotic rod has a certain degree of freedom of movement between multiple vertebrae of the spine, the scoliosis correction device can more accurately adapt to the patient's spinal curvature. The spine retains a certain degree of freedom of movement during the correction process, preserving the patient's mobility in daily life and enabling them to better perform activities such as bending and turning. This invention can also extend and retract according to the actual condition of the spine. Attached Figure Description

[0033] The invention will be further described with reference to the accompanying drawings, but the contents of the drawings do not constitute any limitation on the invention.

[0034] Figure 1 This is a first perspective view of the scoliosis correction device of the present invention.

[0035] Figure 2 This is a first bottom view of the scoliosis correction device of the present invention.

[0036] Figure 3 This is a side view of the scoliosis correction device of the present invention.

[0037] Figure 4 This is a second bottom view of the scoliosis correction device of the present invention.

[0038] Figure 5 This is a second perspective view of the scoliosis correction device of the present invention and an anatomical view of the flexible orthotic rod.

[0039] Figure 6 This is a third perspective view of the scoliosis correction device of the present invention and an anatomical view of the flexible orthotic rod.

[0040] Figure 7 This is a fourth perspective view of the scoliosis correction device of the present invention.

[0041] Figure 8 This is a fifth perspective view and disassembled view of the scoliosis correction device of the present invention.

[0042] Figure 9 This is a schematic diagram of the scoliosis correction device and its assembly with the spine in Example 2.

[0043] Figure 10 This is a schematic diagram of the scoliosis correction device in Example 2.

[0044] Figure 11 This is a schematic diagram of the flexible orthopedic rod in Example 2.

[0045] Figure 12 for Figure 11 A cross-sectional view along the "AA" direction.

[0046] Figure 13 for Figure 10 A schematic diagram of the locking mechanism.

[0047] Figure 14 This is a schematic diagram of the scoliosis correction device and its assembly with the spine in Example 3.

[0048] Figure 15 This is a schematic diagram of the scoliosis correction device in Example 3.

[0049] Figure 16 This is a cross-sectional view of the scoliosis correction device in Example 3.

[0050] Figure 17 for Figure 15 A schematic diagram of the locking mechanism.

[0051] Figure 18 This is a schematic diagram of the scoliosis correction device and its assembly with the spine in Example 4.

[0052] Figure 19 This is a schematic diagram of the scoliosis correction device in Example 4.

[0053] Figure 20 This is a cross-sectional view of the scoliosis correction device in Example 4.

[0054] Figure 21 This is a schematic diagram of the scoliosis correction device in Example 5.

[0055] Figure 22 This is a cross-sectional view of the scoliosis correction device in Example 5.

[0056] exist Figures 1 to 22 This includes:

[0057] 1. Pedicle screw

[0058] Nail body 11, nail head 12, second ball head 13, nail seat 14, fastening stud 15, first through hole 101

[0059] 2. Flexible orthopedic rod

[0060] Rod body 21,

[0061] External joint rod 211, assembly area 2111, slot 2112, tooth 2113

[0062] Internal joint rod 212, ratchet 2121,

[0063] Locking component 213, protruding tooth 2131, claw body 2132, spring piece 2133

[0064] Connector 22

[0065] Hinge housing 221, first ball joint 222, pin seat 223, pin 224, spherical through groove 201, first spherical cavity 202, limiting groove 203.

[0066] 225. Ring 226. Rotating ring 227. Third ball head 228. Concave body 229. Universal ball shell 229. Detailed Implementation

[0067] The technical solution of the present invention will be further described in conjunction with the following embodiments.

[0068] Example 1

[0069] like Figures 1 to 8 As shown, an embodiment of the present invention discloses a scoliosis correction device, which is provided with multiple pedicle screws 1 and flexible orthotic rods 2.

[0070] Among them, multiple pedicle screws 1 jointly fix the flexible orthotic rod 2. The flexible orthotic rod 2 includes a rod body 21 and a connector 22. The multiple rod bodies 21 are movably connected end to end through the connector 22. The included angle A formed by adjacent rod bodies 21 ranges from 160° to 180°.

[0071] The scoliosis correction device of this application forms a flexible orthotic rod 2 by setting a movably connected connector 22 between the rods 21. This allows the spine to be corrected with the help of the flexible orthotic rod 2 while retaining a certain natural range of motion. The spine has a degree of freedom of rotation, and the patient can maintain a certain ability to bend over.

[0072] Because the flexible orthotic rod 2 has a certain degree of freedom of movement between multiple vertebrae of the spine, the scoliosis correction device can more accurately adapt to the patient's spinal curvature. During the correction process, the spine retains a certain degree of freedom of movement, preserving the patient's mobility in daily life, enabling them to better perform activities such as bending and turning, thereby improving their quality of life. The flexible orthotic rod 2 consists of multiple rods 21 connected end-to-end by connectors 22, such as... Figure 3 As shown, the included angle A formed by adjacent rods 21 ranges from 160° to 180°, allowing the spine to maintain its corrective effect while ensuring a certain degree of rotational freedom between adjacent vertebrae. This allows the spine to move naturally within a certain range, reducing the stiffness of traditional fixation devices and better adapting to the body's natural movements and changes, providing greater comfort and adaptability. The flexible orthotic rod 2 enables the scoliosis correction device to adapt to the growth and changes of the spine while ensuring the corrective effect, helping to maintain a good corrective effect during long-term use.

[0073] like Figure 1 and Figure 2 As shown, in an optional embodiment of the present invention, the connector 22 includes a hinge housing 221 and a first ball head rod 222. Both ends of the hinge housing 221 are provided with spherical through grooves 201 or first spherical cavities 202 that match the first ball head rod 222. The hinge housing 221 is disposed on both ends of the rod body 21 through the first ball head rod 222.

[0074] By using the hinge housing 221 in conjunction with the first ball joint 222, the connector 22 provides flexible freedom of movement. This also allows for fine-tuning of the scoliosis correction device at different angles and directions, making spinal correction more precise and adaptable to the natural curvature of the individual spine.

[0075] The engagement of the first ball-end rod 222 with the spherical groove 201 and spherical cavity reduces friction and hard contact points at the connection points, making the scoliosis correction device more comfortable to use and reducing discomfort that may be caused by traditional rigid connections. Due to the movable structure of the hinge housing 221 and the ball-end rod, the scoliosis correction device can maintain the natural degree of freedom of spinal movement during correction. This allows patients to retain some mobility during correction, such as bending and turning, thus improving their quality of life. The engagement of the first ball-end rod 222 with the spherical groove 201 or spherical cavity allows the scoliosis correction device to better adapt to the individual patient's spinal curvature. By adaptively adjusting the angle of adjacent rods 21 according to the spinal curvature using the connector 22, the correction angle can be precisely adjusted, resulting in a more effective correction.

[0076] like Figure 3 and Figure 4 As shown, in an optional embodiment of the present invention, the connector 22 includes a hinge housing 221 and a first ball joint 222. The hinge housing 221 is provided with a first spherical cavity 202. The ball joints of the two first ball joints 222 are located in a first spherical cavity 202. The first ball joints 222 are disposed on both ends of the rod body 21.

[0077] like Figure 1 and Figure 5 As shown, in an optional embodiment of the present invention, the pedicle screw 1 includes a screw body 11 and a screw head 12. The screw head 12 is disposed on the screw body 11 and has a first through hole 101 that is adapted to the size of the hinge housing 221. The hinge housing 221 is located at the first through hole 101.

[0078] By ensuring that the first through hole 101 on the screw head 12 matches the size of the hinge housing 221, precise alignment between the screw and the hinge housing 221 is ensured, reducing installation errors of the flexible orthotic rod 2 and improving stability and effectiveness. The screw head 12 allows the screw to be more securely fixed to the hinge housing 221, thereby increasing the stability of the flexible orthotic rod 2, helping to maintain the corrective effect, and preventing loosening or displacement during correction, which could affect the corrective effect. The first through hole 101 ensures the accurate position of the hinge housing 221 within the screw head 12, thus avoiding potential malfunctions or damage due to improper connection and improving safety during use.

[0079] like Figure 7As shown, in an optional embodiment of the present invention, the pedicle screw 1 includes a screw body 11, a screw head 12, and a second ball-head rod 13. The hinge housing 221 also has a second spherical cavity. One end of the second ball-head rod 13 has a ball head that matches the second spherical cavity, and the other end of the second ball-head rod 13 is disposed on the screw head 12, which is disposed on the screw body 11. The interaction between the second ball-head rod 13 and the second spherical cavity allows the second ball-head rod 13 to provide greater joint flexibility. The presence of the ball head allows the screw to be adjusted at different angles and directions, thereby improving the flexibility of spinal correction and adapting to the complexities of natural spinal curvature.

[0080] The ball head at one end of the second ball head rod 13 can be precisely embedded into the second spherical cavity in the hinge housing 221, facilitating the connection and fixation of the pedicle screw 1 to the flexible orthotic rod 2. The engagement of the screw head 12 with the screw body 11 and the connection of the second ball head rod 13 increases the stability of the flexible orthotic rod 2. The connection between the screw and the second ball head rod 13 via the screw head 12 allows the flexible orthotic rod 2 to be more firmly fixed to the spine, reducing the risk of displacement or loosening of the flexible orthotic rod 2 due to movement or load changes.

[0081] like Figure 7 As shown, in an optional embodiment of the present invention, the first ball-end rod 222 is perpendicular to the nail body 11. By making the first ball-end rod 222 perpendicular to the nail body 11, the force distribution of the scoliosis correction device can be more even when bearing spinal load. The vertical structure makes the force transmission path more direct, which helps to reduce unnecessary lateral stress, thereby improving the stability and support of the device for the spine during correction. The vertical configuration of the first ball-end rod 222 and the nail body 11 allows the device to maintain high structural integrity during use, reducing the risk of device deformation or damage due to uneven force distribution and improving the long-term stability of the device. During surgery, the vertical configuration simplifies the installation and layout of the device. Since the relative positions of the nail body 11 and the first ball-end rod 222 are fixed, medical personnel can more intuitively position and install the flexible orthotic rod 2 through the first ball-end rod 222, reducing the difficulty and time of operation. By keeping the first ball head 222 perpendicular to the nail body 11, the distance between the flexible orthotic rod 2 and the spine can be reduced, allowing the flexible orthotic rod 2 to fit the spine more closely while maintaining the same nail body 11 height, making it easier to embed the flexible orthotic rod 2 in a limited space.

[0082] like Figure 6 As shown, in an optional embodiment of the present invention, the connector 22 includes a hinge housing 221 and a first ball head rod 222. The hinge housing 221 is provided with a first spherical cavity 202. The first ball head rod 222 is adapted to the first spherical cavity 202. The first ball head rod 222 and the hinge housing 221 are respectively disposed on both ends of the rod body 21.

[0083] By engaging the first spherical cavity 202 within the hinge housing 221 with the first ball-head rod 222, the rods 21 at both ends of the connector 22 are allowed to rotate in multiple directions, providing the flexible orthotic rod 2 with a greater range of motion and flexibility. This allows the flexible orthotic rod 2 to better adapt to complex spinal curvatures, thereby improving the corrective effect. Due to the spherical engagement between the first ball-head rod 222 and the hinge housing 221, the installation and adjustment of the flexible orthotic rod 2 become simpler. Medical personnel can more easily position and fix the connector 22, thus saving surgical time and reducing operational complexity.

[0084] The spherical fit between the hinge housing 221 and the first ball-end rod 222 provides a secure connection, reducing the loss of corrective effect due to loosening or displacement of device components, increasing the long-term stability and durability of the flexible orthotic rod 2, and improving the persistence of the corrective effect. The spherical fit makes force transmission more uniform and stable, reducing local stress concentration. When the flexible orthotic rod 2 bears the load of the spine, the force can be distributed more evenly, thereby improving the support effect on the spine during correction. The spherical cavity and ball-end rod allow for fine-tuning of the rod 21 at different angles and directions, increasing the adaptability of the flexible orthotic rod 2 to different spinal morphologies. This flexibility allows the scoliosis correction device to better meet individualized correction needs, improving the targeting and accuracy of the corrective effect.

[0085] In an optional embodiment of the present invention, the hinge housing 221 is provided with a limiting groove 203, which is connected to the first spherical cavity 202. The limiting groove 203 is used to limit the rotation range of the first ball joint 222.

[0086] By connecting the limiting groove 203 to the first spherical cavity 202, the rotation range of the first ball joint 222 can be precisely controlled, ensuring that the first ball joint 222 moves within a preset range. This helps to achieve more accurate spinal correction and avoids unstable correction results caused by excessive rotation. By limiting the rotation range of the first ball joint 222, the limiting groove 203 can effectively prevent the connector 22 from excessive movement or loss of control during spinal correction, helping to protect the spine from excessive force, reducing potential injury risks, and ensuring that the range of spinal movement is not too large, thus ensuring the correction effect.

[0087] By providing a limiting groove 203 in the hinge housing 221, the reliability of the flexible orthotic rod 2 is increased, ensuring stable operation within a preset range of motion, thereby improving the stability of the overall corrective effect. This reduces fluctuations in the corrective effect caused by excessive or unpredictable movement of the flexible orthotic rod 2. The limiting groove 203 simplifies the adjustment process of the flexible orthotic rod 2 by setting a clear rotation range limitation. Operators can more easily set the range of motion of the flexible orthotic rod 2 by changing the connector 22 with different limiting ranges, reducing the complexity of adjustment and the possibility of operational errors. The connector 22, which limits the rotation range, avoids excessive pressure or discomfort on the patient's spine, making the device more comfortable to use. This reduces postoperative discomfort or pain that may result from uncontrolled movement. The connector 22 with the limiting groove 203 increases the safety of the device; by controlling the rotation range, it reduces the risk of accidental movement or mechanical failure, thus providing a higher level of safety.

[0088] Specifically, the connector 22 is detachably connected to the rod 21. Various connectors 22 are available to limit the rotation range of adjacent rods 21. The connectors 22 achieve different rotation limitation ranges through limiting grooves 203 of different sizes. The connector 22 corresponding to the patient's scoliosis is selected based on their rotation limitation range.

[0089] In an optional embodiment of the invention, the limiting groove 203 restricts the rotatable angle range of the first ball joint 222 to 0° to 20°. By limiting the rotatable angle range to 0° to 20°, the degree of freedom of correction applied to the spine by the corrective device can be precisely controlled, which helps to provide accurate correction according to individual needs, optimize the correction effect, and ensure that the correction effect is neither too strong nor too weak. Limiting the rotation angle range to 0° to 20° effectively prevents overcorrection during spinal correction. Overcorrection may lead to patient discomfort or further spinal problems, while the limitation of the limiting groove 203 ensures that the correction process is carried out within a safe and effective range. A clearly defined small rotation angle range can reduce accidental over-rotation and lower the risk of spinal injury during correction. Safe angle limitation can effectively prevent potential injuries caused by uncontrolled angles. Limiting the angle to 0° to 20° ensures that the corrective device operates within a controllable and stable small range, which helps to maintain the stability and reliability of the correction effect.

[0090] like Figure 8As shown, in an optional embodiment of the present invention, the connector 22 includes a pin seat 223 and a pin 224. The pin seat 223 has a pin hole for mounting the pin 224, and the pin 224 is located at the pin hole. Multiple connectors 22 are provided between the pedicle screws 1, and adjacent pins 224 are perpendicular to each other. By providing a pin hole on the pin seat 223 for mounting the pin 224, a tight fit between the pin 224 and the pin seat 223 can be ensured. Precise installation of the pin 224 provides stronger connection stability and reduces the risk of unstable correction effects caused by loosening or detachment of connecting parts.

[0091] The arrangement of multiple connectors 22 and the perpendicular arrangement of adjacent pins 224 allow the rod 21 to move in two different directions, enabling the flexible orthotic rod 2 to adapt to spines with varying degrees of curvature. This enhances the flexibility of the scoliosis correction device, allowing adjustments to be made for different correction schemes and making it suitable for various scoliosis cases. The cooperation between the pins 224 and the pin seat 223 simplifies the assembly and disassembly of the connectors 22. The relatively simple installation and disassembly of the pins 224 reduces the complexity of the scoliosis correction device assembly process, improves operational efficiency, and is particularly suitable for situations requiring frequent adjustment or disassembly of the scoliosis correction device.

[0092] The connection method between pin 224 and pin seat 223 reduces the need for complex connecting components, thus helping to lower manufacturing costs. Simultaneously, the standardized pin 224 and pin seat 223 also contribute to increased production efficiency, further reducing the cost of the device. The fit between pin 224 and pin seat 223 disperses mechanical stress, reducing wear caused by prolonged use or heavy loads, improving the durability and service life of the device, and ensuring good performance even during long-term straightening processes.

[0093] like Figure 5 and Figure 8 As shown, in an optional embodiment of the present invention, the pedicle screw 1 includes a screw body 11, a screw seat 14, and a fastening stud 15. The screw body 11 is rotatably connected to the inner bottom end of the screw seat 14. The threaded section of the screw body 11 is located below the screw seat 14. Symmetrical through slots are provided on both sides of the screw seat 14, and a threaded groove is provided on the inner side of the top of the screw seat 14. The fastening stud 15 is threadedly connected to the threaded groove, and the rod body 21 is sandwiched between the screw body 11 and the fastening stud 15.

[0094] The nail body 11 is rotatably connected to the inner bottom of the nail seat 14, ensuring a tight fit between the nail body 11 and the nail seat 14. This effectively improves the fixation stability of the nail body 11 and the spinal bone, preventing loosening or displacement during use, thus providing a more reliable corrective effect. The threaded groove on the inner side of the top of the nail seat 14 is threadedly connected to the fastening stud 15, making the installation process simpler and more efficient. The tightness of the fastening stud 15 is adjusted by threading to fix the rod 21 clamped between the nail body 11 and the fastening stud 15, ensuring the stability of the flexible orthopedic rod 2 and improving the ease of fixing the rod 21. The rod 21, clamped between the nail body 11 and the fastening stud 15, provides additional support and stability. This not only enhances the overall strength of the scoliosis correction device but also effectively distributes the corrective force evenly on the spine, reducing local pressure and improving comfort and effectiveness.

[0095] Example 2

[0096] A scoliosis correction device, such as Figures 9 to 13 As shown, the rod body 21 is a telescopic rod body 21; the telescopic rod body 21 is provided with an outer joint rod 211, an inner joint rod 212 and a locking member 213 for locking the relative position of the inner joint rod 212 and the outer joint rod 211. The inner joint rod 212 can be movably fitted inside the outer joint rod 211, and the locking member 213 can be movably assembled on the outer joint rod 211.

[0097] The surface of the locking member 213 is provided with protruding teeth 2131. For example... Figures 10 to 12 As shown, a ratchet 2121 that matches the protruding tooth 2131 is integrally connected to the outer surface of one end of the inner joint rod 212. The end connected to the ratchet 2121 is defined as the first working end. The first working end can be telescopically fitted inside the outer joint rod 211. The locking member 213 can be movably assembled to the outer joint rod 211, and the protruding tooth 2131 meshes with the ratchet 2121.

[0098] The outer joint bar 211 is provided with a second through hole (not shown in the figure) for exposing the ratchet 2121 and an assembly area 2111 for assembling with the locking member 213. The second through hole is located inside the assembly area 2111, and the locking member 213 is movably assembled in the assembly area 2111. The ratchet 2121 extends to the assembly area 2111 through the second through hole.

[0099] like Figure 13 As shown, the locking element 213 is a resilient pawl, which is movably fitted into the assembly area.

[0100] Inside 2111. The elastic pawl is provided with a pawl body 2132 and a spring piece 2133, with the protruding tooth 2131 and the spring piece 2133 integrally connected to the pawl body 2132. The assembly area 2111 is an assembly groove, and the elastic pawl is embedded inside the assembly groove.

[0101] When adjusting the length of the retractable rod 21, the doctor compresses the elastic pawl, thereby separating the protruding tooth 2131 from the ratchet tooth 2121, adjusting the position of the inner joint rod 212. After releasing, the elastic pawl automatically matches and restores the matching external thread, and the protruding tooth 2131 engages with the ratchet tooth 2121, thereby locking the position of the inner joint rod 212 and the outer joint rod 211.

[0102] like Figures 10 to 12 As shown, connector 22 is provided with a collar 225 and a rotating ring 226. The rotating ring 226 is rotatably fitted inside the collar 225, and a pedicle screw (not shown) passes through the rotating ring 226. The collar 225 has an opening, and the rotating ring 226 is a closed ring. When the collar 225 is integrally connected to the outer joint rod 211, the rotating ring 226 is integrally connected to the inner joint rod 212; when the collar 225 is integrally connected to the inner joint rod 212, the rotating ring 226 is integrally connected to the outer joint rod 211. This embodiment uses the example of the collar 225 being integrally connected to the outer joint rod 211 and the rotating ring 226 being integrally connected to the inner joint rod 212 for explanation. The connector 22 in this embodiment has a relatively simple structure and small size.

[0103] It should be noted that in this embodiment, the rotating ring 226 rotates around the central axis of the pedicle screw along the opening of the collar 225, thus having a certain degree of freedom of movement.

[0104] Compared with Example 1, the scoliosis correction device in this example not only has a certain degree of freedom of movement, but can also extend and retract according to the actual condition of the spine to match different situations.

[0105] Example 3

[0106] A scoliosis correction device, such as Figures 14 to 17 As shown, the rod body 21 is a telescopic rod body 21; the telescopic rod body 21 is provided with an outer joint rod 211, an inner joint rod 212 and a locking member 213 for locking the relative position of the inner joint rod 212 and the outer joint rod 211. The inner joint rod 212 can be movably fitted inside the outer joint rod 211, and the locking member 213 can be movably assembled on the outer joint rod 211.

[0107] The surface of the locking member 213 is provided with protruding teeth 2131. For example... Figures 15 to 16 As shown, a ratchet 2121 that matches the protruding tooth 2131 is integrally connected to the outer surface of one end of the inner joint rod 212. The end connected to the ratchet 2121 is defined as the first working end. The first working end can be telescopically fitted inside the outer joint rod 211. The locking member 213 can be movably assembled to the outer joint rod 211, and the protruding tooth 2131 meshes with the ratchet 2121.

[0108] The outer joint bar 211 is provided with a second through hole (not shown in the figure) for exposing the ratchet 2121 and an assembly area 2111 for assembling with the locking member 213. The second through hole is located inside the assembly area 2111, and the locking member 213 is movably assembled in the assembly area 2111. The ratchet 2121 extends to the assembly area 2111 through the second through hole.

[0109] like Figure 17 As shown, the locking element 213 is a closely spaced toothed cam, which is rotatably connected to the assembly area 2111. When adjusting the length of the telescopic rod 21, the closely spaced toothed cam will be rotated, thereby separating the convex tooth 2131 from the ratchet tooth 2121, adjusting the position of the inner joint rod 212. Then, the closely spaced toothed cam will be restored, and the convex tooth 2131 will engage with the ratchet tooth 2121, thereby locking the positions of the inner joint rod 212 and the outer joint rod 211.

[0110] The connector 22 is provided with a third ball joint 227 and a concave body 228 that matches the third ball joint 227. The third ball joint 227 and the concave body 228 can slide and abut against each other. When the concave body 228 is integrally connected to the outer joint rod 211, the third ball joint 227 is integrally connected to the inner joint rod 212; when the concave body 228 is integrally connected to the inner joint rod 212, the third ball joint 227 is integrally connected to the outer joint rod 211. This embodiment is described using the example of the concave body 228 being integrally connected to the outer joint rod 211 and the third ball joint 227 being integrally connected to the inner joint rod 212.

[0111] It should be noted that the third ball joint 227 and the concave body 228 form a joint structure, enabling the third ball joint 227 to rotate and have a certain degree of freedom of movement.

[0112] The pedicle screw 1 is provided with a screw seat 14, a fastening stud 15 and a screw body (not shown in the figure). One end of the screw body extends from the lower part of the screw seat 14 to the outside. The third ball head 227 and the concave body 228 are both located inside the screw seat 14. The fastening stud 15 is threaded to the upper end of the screw seat 14.

[0113] Compared with Example 1, the scoliosis correction device in this example not only has a certain degree of freedom of movement, but can also extend and retract according to the actual condition of the spine to match different situations.

[0114] Example 4

[0115] A scoliosis correction device, such as Figures 18 to 20 As shown, the rod body 21 is a telescopic rod body 21; the telescopic rod body 21 is provided with an outer joint rod 211, an inner joint rod 212 and a locking member 213 for locking the relative position of the inner joint rod 212 and the outer joint rod 211. The inner joint rod 212 can be movably fitted inside the outer joint rod 211, and the locking member 213 can be movably assembled on the outer joint rod 211.

[0116] The locking element 213 is a locking knob, which is fitted onto the outer surface of the outer joint bar 211 and is threadedly connected to the outer joint bar 211.

[0117] One end of the outer joint bar 211 has an external thread integrally connected to its outer surface, which matches the locking knob. This threaded end is defined as the second working end. The inner joint bar 212 is telescopically fitted inside the second working end. The end of the second working end has multiple longitudinal slits 2112. The inner surface of the second working end has teeth 2113 integrally connected to it, and ratchet 2121 engages with the teeth 2113.

[0118] When adjusting the length of the telescopic rod 21, rotate the locking knob to the outside of the second working end to adjust the position of the inner joint rod 212, and then rotate the locking knob to the end of the second working end to lock the positions of the inner joint rod 212 and the outer joint rod 211.

[0119] It should be noted that, since the end of the second working end has multiple slits 2112, when the locking knob is turned open, the inner joint rod 212 is released from the second working end and can extend and retract. When it moves to the appropriate position, the locking knob is rotated to the end of the second working end to close the slits 2112 of the outer joint rod 211, thereby locking the positions of the inner joint rod 212 and the outer joint rod 211.

[0120] The connector 22 is provided with a third ball joint 227, a concave body 228 matching the third ball joint 227, and a universal ball housing 229. The third ball joint 227 and the concave body 228 are slidably abutting against each other, and both the third ball joint 227 and the concave body 228 are located in the universal ball housing 229. When the concave body 228 is integrally connected to the outer joint rod 211, the third ball joint 227 is integrally connected to the inner joint rod 212; when the concave body 228 is integrally connected to the inner joint rod 212, the third ball joint 227 is integrally connected to the outer joint rod 211. This embodiment is described using the example of the concave body 228 being integrally connected to the outer joint rod 211 and the third ball joint 227 being integrally connected to the inner joint rod 212.

[0121] It should be noted that the third ball joint 227 and the concave body 228 form a joint structure, which allows the third ball joint 227 to rotate. Moreover, the third ball joint 227 and the concave body 228 are located inside the universal ball shell 229 as a whole, making their rotation more flexible.

[0122] The pedicle screw 1 is provided with a screw seat 14, a fastening stud (not shown in the figure) and a screw body (not shown in the figure). One end of the screw body extends from the lower part of the screw seat 14 to the outside. The third ball head 227 and the concave body 228 are both located inside the screw seat 14. The fastening stud is threaded to the upper end of the screw seat 14.

[0123] The pedicle screw 1 is provided with a screw seat 14, a fastening stud 15 and a screw body (not shown in the figure). One end of the screw body extends from the lower part of the screw seat 14 to the outside. The third ball head 227, the concave body 228 and the universal ball shell 229 are all located inside the screw seat 14. The fastening stud 15 is threaded to the upper end of the screw seat 14.

[0124] Compared with Example 1, the scoliosis correction device in this example not only has a certain degree of freedom of movement, but can also extend and retract according to the actual condition of the spine to match different situations.

[0125] Example 5

[0126] A scoliosis correction device, such as Figure 21 and Figure 22 As shown, the rod body 21 is a telescopic rod body 21; the telescopic rod body 21 is provided with an outer joint rod 211, an inner joint rod 212 and a locking member 213 for locking the relative position of the inner joint rod 212 and the outer joint rod 211. The inner joint rod 212 can be movably fitted inside the outer joint rod 211, and the locking member 213 can be movably assembled on the outer joint rod 211.

[0127] The locking element 213 is a locking knob, which is fitted onto the outer surface of the outer joint bar 211 and is threadedly connected to the outer joint bar 211.

[0128] One end of the outer joint bar 211 has an external thread integrally connected to its outer surface, which matches the locking knob. This threaded end is defined as the second working end. The inner joint bar 212 is telescopically fitted inside the second working end. The end of the second working end has multiple longitudinal slits 2112. The inner surface of the second working end has teeth 2113 integrally connected to it, and ratchet 2121 engages with the teeth 2113.

[0129] When adjusting the length of the telescopic rod 21, rotate the locking knob to the outside of the second working end to adjust the position of the inner joint rod 212, and then rotate the locking knob to the end of the second working end to lock the positions of the inner joint rod 212 and the outer joint rod 211.

[0130] It should be noted that, since the end of the second working end has multiple slits 2112, when the locking knob is turned open, the inner joint rod 212 is released from the second working end and can extend and retract. When it moves to the appropriate position, the locking knob is rotated to the end of the second working end to close the slits 2112 of the outer joint rod 211, thereby locking the positions of the inner joint rod 212 and the outer joint rod 211.

[0131] The connector 22 is provided with a third ball joint 227 and a universal ball housing 229. The third ball joint 227 is slidably abutted against the side wall of the universal ball housing 229, and both the third ball joint 227 and the concave body 228 are located in the universal ball housing 229. The pedicle screw 1 is provided with a screw seat 14, a fastening stud 15, and a screw body 11. The screw seat 14 is integrally connected to the outer joint rod 211, and the screw body 11 extends from the lower part of the screw seat 14 to the outside. The fastening stud 15 is threadedly connected to the upper end of the screw seat 14. The third ball joint 227 is integrally connected to the inner joint rod 212, and the universal ball housing 229 is integrally assembled inside the screw seat 14. The third ball joint 227 is movably assembled inside the universal ball housing 229. When the pin seat 14 is integrally connected to the outer articulator 211, the third ball head rod 227 is integrally connected to the inner articulator 212; when the third ball head rod 227 is integrally connected to the inner articulator 212, the pin seat 14 is integrally connected to the outer articulator 211; this embodiment is illustrated by taking the integral connection of the pin seat 14 and the outer articulator 211, and the integral connection of the third ball head rod 227 and the inner articulator 212 as an example.

[0132] It should be noted that the third ball joint 227 and the universal ball housing 229 form a joint structure, enabling the third ball joint 227 to rotate and have a certain degree of freedom of movement.

[0133] Compared with Example 1, the scoliosis correction device in this example not only has a certain degree of freedom of movement, but can also extend and retract according to the actual condition of the spine to match different situations.

[0134] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the essence and scope of the technical solutions of the present invention.

Claims

1. A scoliosis correction device, comprising a plurality of pedicle screws and a flexible orthotic rod, wherein the plurality of pedicle screws jointly fix the flexible orthotic rod; the flexible orthotic rod includes a rod body and a connector, wherein the plurality of rod bodies are movably connected end-to-end via the connector; characterized in that: The rod is a telescopic rod; The retractable rod is provided with an outer joint rod, an inner joint rod, and a locking member for locking the relative position of the inner joint rod and the outer joint rod. The inner joint rod is movably fitted inside the outer joint rod, and the locking member is movably assembled to the outer joint rod.

2. The scoliosis correction device according to claim 1, characterized in that: The surface of the locking element is provided with protruding teeth; One end of the inner joint bar has a ratchet tooth integrally connected to its outer surface, which matches the convex tooth. The end connected to the ratchet tooth is defined as the first working end. The first working end is telescopically fitted inside the outer joint bar. The locking member is movably assembled to the outer joint bar, and the convex tooth meshes with the ratchet tooth.

3. The scoliosis correction device according to claim 2, characterized in that: The outer joint bar is provided with a second through hole for exposing the ratchet and an assembly area for assembling with the locking member. The second through hole is located inside the assembly area, the locking member is movably assembled in the assembly area, and the ratchet extends to the assembly area through the second through hole.

4. The scoliosis correction device according to claim 3, characterized in that: The locking element is a resilient pawl, which is movably fitted inside the assembly area. When the length of the retractable rod is adjusted, the elastic pawl is compressed, thereby separating the convex tooth from the ratchet tooth, adjusting the position of the inner joint rod, and then the elastic pawl is restored, and the convex tooth engages with the ratchet tooth, thereby locking the positions of the inner joint rod and the outer joint rod.

5. The scoliosis correction device according to claim 3, characterized in that: The locking element is a closely spaced toothed cam, which is rotatably connected to the assembly area. When adjusting the length of the telescopic rod, the closely spaced cam is rotated, thereby separating the convex tooth from the ratchet tooth, adjusting the position of the inner joint rod, and then the closely spaced cam is restored, and the convex tooth engages with the ratchet tooth, thereby locking the positions of the inner joint rod and the outer joint rod.

6. The scoliosis correction device according to claim 1, characterized in that: The locking element is a locking knob, which is fitted onto the outer surface of the outer joint bar and is threadedly connected to the outer joint bar.

7. The scoliosis correction device according to claim 6, characterized in that: One end of the outer joint bar has an integrally connected external thread that matches the locking knob. The end connected to the external thread is defined as the second working end. The inner joint bar can be telescopically fitted inside the second working end.

8. The scoliosis correction device according to claim 7, characterized in that: The end of the second working end is provided with multiple longitudinal slits, and the inner surface of the second working end is integrally connected with teeth, and the ratchet of the inner joint bar engages with the teeth. When adjusting the length of the retractable rod, rotate the locking knob to the outside of the second working end to adjust the position of the inner joint rod, and then rotate the locking knob to the end of the second working end to lock the positions of the inner joint rod and the outer joint rod.

9. The scoliosis correction device according to any one of claims 1 to 8, characterized in that: The connector is provided with a collar and a rotating ring. The rotating ring is rotatably assembled inside the collar, and the pedicle screw passes through the rotating ring.

10. The scoliosis correction device according to claim 9, characterized in that: The collar has an opening, and the rotating ring is a closed circular ring.

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