A correction structure for lateral correction of a scoliosis based on a growing rod

Abstract

The application discloses a correction structure for transverse correction of scoliosis based on a growing rod, and belongs to the technical field of medical devices.The correction structure comprises a growing rod, a motion adaptation assembly, a transverse traction assembly and an elastic correction assembly.The motion adaptation assembly is sleeved on the growing rod.The transverse traction assembly is used for surrounding and pulling a scoliosis vertebral body and is connected with the motion adaptation assembly.The elastic correction assembly is connected with the motion adaptation assembly at one end and is implanted into the scoliosis vertebral body at the other end.The elastic correction assembly is used for providing a pulling force and an elastic buffering force to correct the scoliosis vertebral body.The correction structure has the advantages of solving the problems of poor targeting, lack of stress buffering mechanism, imperfect anti-rebound mechanism and poor motion adaptability of the existing growing rod for transverse correction, and improving the treatment effect on early-onset scoliosis of children.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, and in particular to a corrective structure for lateral correction of scoliosis based on growth rods. Background Technology

[0002] Early-onset scoliosis in children is a common spinal deformity, and implanting growth rods in the scoliosis area is a common treatment option. As a core internal fixation device for treating this condition, the growth rod system, through its longitudinal expansion and growth-adaptive properties, guides spinal growth in children, corrects spinal deformities, and preserves the growth potential of the spine and lungs in pediatric patients.

[0003] Current growth bar technology primarily focuses on longitudinal length adjustment to accommodate spinal growth, but it suffers from the following technical limitations in clinical applications: Firstly, the transverse correction is not targeted enough. The existing structure relies on longitudinal stretching to indirectly improve scoliosis, which cannot form precise directional traction on the convex side of the spine. The correction efficiency is limited and it is difficult to quickly improve coronal lateral curvature deformity.

[0004] Secondly, the lack of stress buffering mechanism means that existing orthopedic structures lack internal elastic buffer units when applying corrective force, which cannot effectively dissipate and balance the impact stress generated by instantaneous overload during surgery or daily activities after surgery. This can easily lead to local stress concentration in the vertebral body and increase the risk of tissue damage.

[0005] Third, the anti-rebound mechanism is imperfect. After correction, the spine is prone to rebound due to its own elastic recovery or daily activities, which leads to the loss of the corrective effect. The device needs to be adjusted repeatedly, which increases the patient's pain and treatment cost.

[0006] Fourth, the adaptability to movement is poor. Traditional structures are mostly rigid connections, which cannot accommodate the rotational needs of the spine in daily movement, easily restricting the patient's mobility and even causing the device to shift or loosen.

[0007] Therefore, developing a growth bar with precise lateral correction capability, stress buffering function, anti-rebound mechanism and certain motion adaptability is the key to solving the pain points of existing technologies and has important clinical significance for improving the treatment effect of early-onset scoliosis in children. Summary of the Invention

[0008] The purpose of this invention is to provide a corrective structure for lateral correction of scoliosis based on growth rods, which solves the shortcomings of existing growth rods, such as insufficient targeting of lateral correction, lack of stress buffering mechanism, imperfect anti-rebound mechanism, and poor exercise adaptability.

[0009] To achieve the above objectives, the present invention provides a corrective structure for lateral correction of scoliosis based on a growth rod, comprising: a growth rod, a motion adapter component, a lateral traction component, and an elastic correction component; the motion adapter component is sleeved on the growth rod; the lateral traction component is used to surround and pull the scoliotic vertebra and is connected to the motion adapter component; one end of the elastic correction component is connected to the motion adapter component, and the other end is implanted into the scoliotic vertebra, the elastic correction component being used to provide traction force and elastic buffering force to correct the scoliotic vertebra.

[0010] Preferably, the elastic correction component includes a first sleeve, which is a hollow cylindrical structure with one end closed and the other end open. The closed end of the first sleeve is implanted into the scoliosis vertebra. A guide is integrally provided on the closed end of the first sleeve. The guide includes a conical head and a rod that are connected as one piece. The maximum radial dimension of both the conical head and the rod is smaller than the inner diameter of the first sleeve. The guide is connected to the closed end of the first sleeve through the rod. The length of the rod is greater than the length of the first sleeve. The conical head extends out from the open end of the first sleeve.

[0011] Preferably, the elastic correction component further includes a second sleeve, which is a hollow cylindrical structure with one end closed and the other end open. The inner diameter of the second sleeve is larger than the maximum radial dimension of the guide, and the outer diameter of the second sleeve is smaller than the inner diameter of the first sleeve. The open end of the second sleeve is inserted into the open end of the first sleeve, and the second sleeve is slidably connected to the first sleeve. The inner wall of the second sleeve is provided with thorns that are adapted to the conical head of the guide. The closed end of the second sleeve is fixedly connected to the motion adapter component. The conical head of the guide extends into the second sleeve and forms a one-way lock with the thorns.

[0012] Preferably, the thorn includes two rows of opposing ratchet structures, each ratchet structure comprising a plurality of elastic ratchet units arranged continuously along the axial direction of the second sleeve; the guide conical head passes between the two rows of ratchet structures and engages between the opposing elastic ratchet units.

[0013] Preferably, a spring is provided inside the first sleeve and sleeved on the guide rod. One end of the spring abuts against the closed end of the first sleeve, and the other end of the spring abuts against the elastic ratchet unit on one side of the open end of the second sleeve.

[0014] Preferably, the motion adapter module includes an adapter sleeve, which is sleeved on the growth rod and rotatably connected to the growth rod, and the closed end of the second sleeve is connected to the adapter sleeve.

[0015] Preferably, the inner wall of the adapter cylinder is provided with a lubricating coating.

[0016] Preferably, the lateral traction component is a mesh restraint strap woven from medical polyester fiber.

[0017] Preferably, the mesh of the mesh constraint band is diamond-shaped.

[0018] Preferably, the transverse traction assembly has bolt holes at both ends, which are connected to the appropriate sleeve by medical locking bolts.

[0019] The advantages and positive effects of the scoliosis correction structure based on growth rods for lateral correction described in this invention are as follows: 1. Highly efficient transverse correction: Through the directional circumferential traction of the convex side of the spine by the transverse traction component, combined with the guiding effect of the guide, the scoliosis spine is directly pulled to the concave side. Compared with the indirect correction of traditional longitudinal expansion, it is more targeted and improves the correction efficiency.

[0020] 2. Safe and controllable traction force: The spring balances the traction pressure of the lateral traction component in real time through the contraction elasticity, avoiding tissue damage caused by local pressure overload.

[0021] 3. Durable and reliable anti-rebound effect: The thorn structure on the inner wall of the second sleeve forms a mechanical one-way lock with the guide, which can effectively limit the rebound of the spine to the convex side after correction, significantly improving the maintenance rate of the corrective effect, and eliminating the need for additional locking operations.

[0022] 4. Excellent adaptability to movement: The rotatable assembly design between the movement adaptation component and the growth rod, combined with the inner wall lubrication coating, can synchronously adapt to the rotational needs of the spine in daily activities, without affecting the patient's motor function and reducing the risk of device displacement.

[0023] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the overall assembly structure of a preferred embodiment of the scoliosis correction structure based on growth rods for lateral correction according to the present invention. Figure 2 This is a top view of the overall assembly structure of a preferred embodiment of the scoliosis correction structure based on growth rods for lateral correction according to the present invention. Figure 3 This is a schematic diagram of the installation of the guide and the first sleeve in a preferred embodiment of the corrective structure for lateral correction of scoliosis based on growth rods according to the present invention. Figure 4 This is a schematic diagram of the assembly of an elastic correction component according to a preferred embodiment of a correction structure for lateral correction of scoliosis based on growth rods of the present invention. Figure 5 This is a schematic diagram of the installation of the transverse traction component and the motion adaptation component in a preferred embodiment of the corrective structure for transverse correction of scoliosis based on growth rods according to the present invention. Figure 6 This is a schematic diagram of the vertebral perforation of a preferred embodiment of the corrective structure for lateral correction of scoliosis based on growth rods according to the present invention. Figure 7 This is a schematic diagram of an elastic correction component embedded in a vertebra of a preferred embodiment of a correction structure for lateral correction of scoliosis based on growth rods according to the present invention. Figure 8 This is a schematic diagram of the installation of the motion adapter component and the elastic correction component in a preferred embodiment of the corrective structure for lateral correction of scoliosis based on growth rods according to the present invention.

[0025] Figure Labels 1. Lateral traction assembly; 2. Elastic correction assembly; 3. Motion adapter assembly; 4. First sleeve; 5. Guide; 6. Second sleeve; 7. Spike; 8. Spring; 9. Medical locking bolt. Detailed Implementation

[0026] In the description of this invention, it should be noted that the terms "upper," "lower," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product is in use. They are used only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," and "connect" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0027] In this application, unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains. In case of any inconsistency, the meaning set forth in this specification or derived from the content described herein shall prevail. Furthermore, the terminology used herein is for the purpose of describing embodiments of this application only and is not intended to limit the scope of this application.

[0028] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0029] like Figures 1-2As shown, the present invention discloses a lateral correction structure for scoliosis based on a growth rod, comprising: a growth rod, a motion adapter component 3, a lateral traction component 1, and an elastic correction component 2; the motion adapter component 3 is sleeved on the growth rod; the lateral traction component 1 is used to surround and pull the scoliotic vertebra and is connected to the motion adapter component 3; one end of the elastic correction component 2 is connected to the motion adapter component 3, and the other end is implanted into the scoliotic vertebra. The elastic correction component 2 corrects the scoliotic vertebra in the concave direction. The elastic correction component 2 applies traction force and elastic buffering force to the scoliotic vertebra. When the correction operation stops, the elastic correction component 2 automatically locks to maintain the corrected shape and prevent the scoliotic vertebra from rebounding.

[0030] The motion adaptation component 3 includes an adaptation sleeve, which is a hollow tubular structure made of biocompatible titanium alloy. It is fitted onto the outside of the existing growth rod and rotates in connection with the growth rod. Its inner diameter is larger than the outer diameter of the growth rod, and it can rotate synchronously with the spinal rotation to achieve motion adaptation.

[0031] The inner wall of the fitting tube is coated with a lubricating layer. This lubricating layer must meet the orthopedic implant requirements of biocompatibility, wear resistance, and a low coefficient of friction. The specific details are as follows: The coating material is a recommended diamond-like carbon coating, with a coefficient of friction as low as 0.05-0.1 and excellent wear resistance, capable of withstanding millions of axial sliding cycles. The coating process employs plasma-enhanced chemical vapor deposition (PECVD), with a coating thickness controlled at 2-5 μm, uniformly covering the contact area between the inner wall of the fitting tube and the outer wall of the growth rod. The edges are treated with a gradient transition to prevent coating detachment. The coating surface is hydrophilized to reduce postoperative tissue fluid protein adsorption and minimize the risk of inflammatory reactions.

[0032] Specifically, through the rotatable assembly design between the motion adapter component 3 and the growth rod, combined with the inner wall lubrication coating, it can simultaneously adapt to the rotational needs of the spine during daily activities, without affecting the patient's motor function and reducing the risk of device displacement.

[0033] like Figures 3-4 As shown, the elastic correction component 2 includes a first sleeve 4, which is a hollow cylindrical structure with one end closed and the other end open. The closed end of the first sleeve 4 is implanted into the scoliosis vertebra. A guide 5 is integrally provided on the closed end of the first sleeve 4. The guide 5 includes a conical head and a rod that are connected as one piece. The maximum radial dimension of the conical head and the rod is smaller than the inner diameter of the first sleeve 4. The guide 5 is connected to the closed end of the first sleeve 4 through the rod. The length of the rod is greater than the length of the first sleeve 4. The conical head extends out from the open end of the first sleeve 4.

[0034] The elastic correction component 2 also includes a second sleeve 6, which is a hollow cylindrical structure with one end closed and the other end open. The inner diameter of the second sleeve 6 is larger than the maximum radial dimension of the guide 5, and the outer diameter of the second sleeve 6 is smaller than the inner diameter of the first sleeve 4. The open end of the second sleeve 6 is inserted into the open end of the first sleeve 4, and the second sleeve 6 is slidably connected to the first sleeve 4. The inner wall of the second sleeve 6 is provided with thorns 7 that are adapted to the conical head of the guide 5. The closed end of the second sleeve 6 is fixedly connected to the motion adapter component 3. The conical head of the guide 5 extends into the second sleeve 6, and the thorns 7 on the inner wall of the second sleeve 6 lock the conical head of the guide 5, forming a one-way locking.

[0035] The thorn 7 includes two rows of opposing ratchet structures, each ratchet structure comprising a plurality of elastic ratchet units arranged continuously along the axial direction of the second sleeve 6; the conical head of the guide 5 passes between the two rows of ratchet structures and engages with the opposing elastic ratchet units.

[0036] A spring 8 is fitted inside the first sleeve 4 and sleeved on the rod of the guide member 5. One end of the spring 8 abuts against the closed end of the first sleeve 4, and the other end of the spring 8 is limited by an elastic ratchet unit on the open side of the second sleeve 6. The fatigue life of the spring 8 is not less than 1 million cycles to ensure long-term stability. A spring with appropriate stiffness is selected to ensure that the elastic ratchet unit can firmly abut against the spring.

[0037] The inner wall of the second sleeve 6 has two opposing elastic ratchet units on either side, forming a limiting point. The diameter of the limiting point is smaller than the bottom diameter of the conical head of the guide 5. When the first sleeve 4 is pushed along the axial direction of the second sleeve 6 towards the motion adapter 3, the conical head of the guide 5 moves synchronously inside the first sleeve 4. At this time, the conical head of the guide 5 moves along the inclined surface of the elastic ratchet unit 7 on the inner wall of the second sleeve 6, and the first sleeve 4 and the second sleeve 6 achieve relative movement. When the first sleeve 4 is stopped, the elastic ratchet unit on the inner wall of the second sleeve 6 locks the conical head of the guide 5, achieving one-way locking and preventing the guide 5 from moving backward and rebounding into the spine.

[0038] The first sleeve 4, the second sleeve 6, and the guide 5 are all made of medical-grade titanium alloy and have been passivated, exhibiting excellent corrosion resistance and biocompatibility.

[0039] Specifically, the spring 8 balances the traction pressure on the apical vertebra by the transverse traction component 1 and the elastic correction component 2 in real time through elasticity, so that the traction force is safe and controllable and avoids tissue damage caused by local pressure overload.

[0040] Specifically, the thorn 7 structure on the inner wall of the second sleeve 6 forms a mechanical one-way lock with the guide 5, which can effectively limit the rebound of the spine to the convex side after correction, significantly improve the maintenance rate of the orthodontic effect, and eliminate the need for additional locking operations, making the anti-rebound effect durable and reliable.

[0041] like Figures 5-8 As shown, the transverse traction component 1 is a long strip of mesh restraint strap woven from medical-grade polyester fiber, with a width of 10mm-20mm and a thickness of 2mm-3mm. The mesh restraint strap has diamond-shaped holes, which gives the transverse traction component 1 both elasticity and tensile strength.

[0042] The transverse traction assembly 1 has bolt holes at both ends, and is connected to the appropriate sleeve by medical locking bolts 9.

[0043] Anti-slip texture can be provided on the surface of the lateral traction component 1. The anti-slip texture can be a regular texture with alternating concave and convex sections to prevent relative slippage and ensure traction accuracy.

[0044] Specifically, by using the lateral traction component 1 to directionally circumferentially traction the convex side of the spine, and with the guiding effect of the guide component 5, the scoliosis spine is directly pulled towards the concave side. Compared with the traditional indirect correction of longitudinal stretching, this method is more targeted and improves the efficiency of lateral correction.

[0045] The present invention provides a method for using a lateral correction structure for scoliosis based on growth rods, as follows: Implantation and Positioning: The corrective structure provided by this invention is pre-installed on the growth rod. After implanting the growth rod according to the conventional spinal surgery procedure, the position of the motion adapter component 3 sleeved on the growth rod is adjusted according to the position of the scoliosis vertebra. After the adjustment is completed, medical locking rings (made of titanium alloy) are set at both ends of the motion adapter component to limit the motion adapter component 3. After the limit is set, the motion adapter component 3 can only rotate relative to the growth rod and cannot slide up and down with the growth rod. The angle of the motion adapter component 3 is adjusted so that the transverse traction component 1 is aligned with the scoliosis vertebra. A minimally invasive hole is made at the corresponding position of the vertebra. The closed end of the first sleeve 4 in the elastic correction component 2 is implanted into the corresponding position of the vertebra.

[0046] Traction correction: After the transverse traction component 1 is wrapped around the scoliosis vertebra and fixed to the motion adapter component 3, the unimplanted part of the first sleeve 4 in the elastic correction component 2 is slowly pushed towards the motion adapter component 3. At this time, the transverse traction component 1 generates a traction force towards the concave side, the elastic correction component 2 generates a traction force towards the concave side, and at the same time, the spring 8 in the elastic correction component 2 is compressed to generate an elastic buffer force to balance the traction force.

[0047] Limiting and locking: When the spine is corrected to the target physiological curvature, the first sleeve 4 is stopped from being pushed, and the thorns 7 on the inner wall of the second sleeve 6 lock the guide 5, forming a one-way lock to prevent the guide 5 from going backward and the spine from rebounding.

[0048] When revision or overcorrection is required in clinical practice, a minimally invasive surgical instrument can be inserted into the inner cavity of the second sleeve 6 to press the elastic thorn 7 so that it deforms and separates from the arrow structure, thereby releasing the unidirectional restriction (the thorn 7 is made of elastic material and can be temporarily deformed under pressure).

[0049] Therefore, the lateral correction structure for scoliosis based on growth rods described in this invention achieves lateral correction, elastic buffering, and unidirectional limitation functions through the coordinated operation of the lateral traction component 1, the elastic correction component 2, and the motion adaptation component 3. This overcomes the technical shortcomings of existing growth rods, such as insufficient targeting of lateral correction, lack of stress buffering mechanism, imperfect anti-rebound mechanism, and poor motion adaptability.

[0050] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. 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 still be made to the technical solutions of the present invention, and these modifications or equivalent substitutions cannot cause the modified technical solutions to deviate from the spirit and scope of the technical solutions of the present invention.

Claims

1. A corrective structure for lateral correction of scoliosis based on growth rods, characterized in that: include: Growth bars, motion adaptation components, lateral traction components, and elastic correction components; The motion adapter is fitted onto the growth rod; the transverse traction component is used to surround and pull the scoliosis vertebra and is connected to the motion adapter; one end of the elastic correction component is connected to the motion adapter, and the other end is implanted into the scoliosis vertebra. The elastic correction component is used to provide traction force and elastic buffering force to correct the scoliosis vertebra.

2. The corrective structure for lateral correction of scoliosis based on growth rods according to claim 1, characterized in that: The elastic correction component includes a first sleeve, which is a hollow cylindrical structure with one end closed and the other end open. The closed end of the first sleeve is implanted into the scoliosis vertebra. A guide is integrally provided on the closed end of the first sleeve. The guide includes a conical head and a rod that are connected as one piece. The maximum radial dimension of the conical head and the rod is smaller than the inner diameter of the first sleeve. The guide is connected to the closed end of the first sleeve through the rod. The length of the rod is greater than the length of the first sleeve. The conical head extends out from the open end of the first sleeve.

3. The corrective structure for lateral correction of scoliosis based on growth rods according to claim 2, characterized in that: The elastic correction component also includes a second sleeve, which is a hollow cylindrical structure with one end closed and the other end open. The inner diameter of the second sleeve is larger than the maximum radial dimension of the guide, and the outer diameter of the second sleeve is smaller than the inner diameter of the first sleeve. The open end of the second sleeve is inserted into the open end of the first sleeve, and the second sleeve is slidably connected to the first sleeve. The inner wall of the second sleeve is provided with thorns that are adapted to the conical head of the guide. The closed end of the second sleeve is fixedly connected to the motion adapter component. The conical head of the guide extends into the second sleeve and forms a one-way lock with the thorns.

4. The corrective structure for lateral correction of scoliosis based on growth rods according to claim 3, characterized in that: The thorn includes two rows of opposing ratchet structures, each ratchet structure comprising a plurality of elastic ratchet units arranged continuously along the axial direction of the second sleeve; the guide conical head passes between the two rows of ratchet structures and engages between the opposing elastic ratchet units.

5. The corrective structure for lateral correction of scoliosis based on growth rods according to claim 4, characterized in that: The first sleeve is provided with a spring sleeved on the guide rod. One end of the spring abuts against the closed end of the first sleeve, and the other end of the spring abuts against the elastic ratchet unit on one side of the open end of the second sleeve.

6. The corrective structure for lateral correction of scoliosis based on growth rods according to claim 3, characterized in that: The motion adapter module includes an adapter sleeve, which is fitted onto the growth rod and rotatably connected to it. The closed end of the second sleeve is connected to the adapter sleeve.

7. The corrective structure for lateral correction of scoliosis based on growth rods according to claim 6, characterized in that: The inner wall of the adapter cylinder is provided with a lubricating coating.

8. The corrective structure for lateral correction of scoliosis based on growth rods according to claim 7, characterized in that: The lateral traction component is a mesh restraint strap woven from medical polyester fiber.

9. The corrective structure for lateral correction of scoliosis based on growth rods according to claim 8, characterized in that: The mesh of the mesh restraint band has diamond-shaped holes.

10. The corrective structure for lateral correction of scoliosis based on growth rods according to claim 9, characterized in that: The transverse traction assembly has bolt holes at both ends, which are connected to the appropriate sleeve by medical locking bolts.

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