A double-locking pedicle screw for fusion and non-fusion surgery

Abstract

The present application discloses a double-locking pedicle screw for fusion and non-fusion surgery, which comprises a ball-head nail and a nail seat connected to the ball-head nail; the nail seat is provided with a fixing channel and a fixing screw hole connected to the side wall of the fixing channel; the double-locking pedicle screw for fusion and non-fusion surgery also comprises two fixing screws that can be threadedly connected to the fixing screw holes, and the two fixing screws are respectively provided with a first extrusion part and a second extrusion part; the fixing screw hole can be connected to one of the fixing screws so that the first extrusion part enters the fixing channel and acts together with the inner wall of the fixing channel to clamp the elastic band passing through the fixing channel, or so that the second extrusion part can enter the fixing channel and acts together with the inner wall of the fixing channel to clamp the rigid rod passing through the fixing channel. The present application can fix both the elastic band and the rigid rod by replacing the fixing screws, and the damage to the patient is relatively small when replacing the connection object.

Description

Technical Field

[0001] The present application belongs to the field of medical device technology, and specifically relates to a double-locking pedicle screw for fusion and non-fusion surgery. Background Art

[0002] For adults or skeletally mature patients with spinal deformity, the most commonly used surgical option is posterior scoliosis correction with internal fixation and bone grafting and fusion. That is, after correction during the operation, a rigid connecting rod (such as titanium rod or cobalt-chromium-molybdenum rod) is used to connect the corrected spine together, and autologous bone / allogeneic bone is used to completely fuse the surgical segments. This can achieve a stable and effective scoliosis correction effect. However, the problem faced by this operation method is that the spinal fixation and fusion segment will lose spinal mobility, and will face greater functional problems in future daily life, physical exercise, work, etc.

[0003] In addition, for young and adolescent patients with spinal deformity who still have growth potential, early fusion and fixation will sacrifice the growth and development ability of the fused segment, which may cause problems such as short spinal development and short stature in children. In response to the problem that spinal fusion surgery will cause decreased spinal mobility and loss of growth ability, European and American scholars have proposed the concept of spinal "non-fusion technology" in recent years, among which vertebral tethering technology, one of the representatives, has been initially applied in clinical practice. The technical concept is based on the Hueter-Volkmann law, that is, as the pressure on the epiphysis increases, bone growth will be inhibited; as the pressure on the epiphysis decreases, bone growth will be accelerated. During spinal growth, the longitudinal development of the spine is inhibited under mechanical pressure and stimulated to grow under traction. Therefore, this technology places multiple pedicle screws on the convex side of the scoliosis, and then connects the multiple pedicle screws in series through an elastic band. The elastic band applies continuous pressure to the convex side of the scoliosis, so that the growth of the vertebral body on the convex side is inhibited, while the growth of the vertebral body on the concave side is not affected, thereby utilizing the patient's own growth potential to continuously correct the scoliotic deformity. At the same time, the elastic band can undergo a larger deformation relative to the rigid connecting rod. By using an elastic band to correct scoliosis, the growth ability and mobility of the spine are retained.

[0004] In clinical work, some patients use vertebral tethering technology to control or slow down the progression of spinal deformity in the early stage, retain the function of spinal growth, and then switch to traditional fusion surgery after the bones mature. This can retain the growth function of the spine, control the development of scoliosis, save spinal fusion segments, and especially protect the mobility of the lumbar spine. At present, there are certain differences between the two internal fixation systems. In traditional fusion surgery, the internal fixation system includes multiple pedicle screws implanted in the spine, rigid connecting rods connecting the pedicle screws, and the pedicle screws include tail plugs that lock the connecting rods on the screw seat. In vertebral tethering technology, the internal fixation system includes pedicle screws implanted in the vertebral body, elastic binding bands connecting the screws, and pedicle screws including locking tail plugs that lock the elastic binding bands on the screw seat. The core difference between the two methods is the different connecting objects. The former is a rigid connecting rod, and the latter is an elastic binding belt. At present, the tail plug structure for locking the connecting rod or the binding belt does not match, and the screw seats of the two are also different, and they cannot be replaced and interacted. In clinical practice, some patients with spinal deformity face the clinical need of using elastic bands for elastic fixation in the first stage during surgical treatment, and then using rigid rods for rigid fixation in the second stage as time goes by. If the previous structure is followed, the entire internal fixation system needs to be removed, including the elastic binding belt and the pedicle screws that have been connected to the spine, and then the pedicle screws that can be connected to the rigid rods are re-inserted, and the rigid rods are fixed with pedicle screws. Since the pedicle screws have completed bony fusion with the patient's spine, it is meaningless to replace the pedicle screws, which will increase the operation time and bleeding volume, and the re-implantation of pedicle screws will increase the risk of spinal cord and nerve damage. Therefore, if a pedicle screw that can fix both the rigid connecting rod and the elastic binding belt can be designed, the operation of repeated screw insertion can be avoided, which effectively solves the problem of repeated screw insertion of pedicle screws, and makes the surgical treatment method more flexible. Summary of the invention

[0005] In order to improve the flexibility of the operation, so that the doctor can use surgery to replace the connector for spinal correction while reducing harm to the patient after evaluating the patient's spinal condition in the second stage, the present application provides a double-locking pedicle screw for fusion and non-fusion surgery.

[0006] A double-locking pedicle screw for fusion and non-fusion surgery, comprising a ball-head nail and a nail seat connected to the ball-head nail; the nail seat is provided with a fixing channel and a fixing screw hole connected to the side wall of the fixing channel; the double-locking pedicle screw for fusion and non-fusion surgery also includes two fixing screws that can be threadedly connected to the fixing screw holes, the two fixing screws are respectively provided with a first extrusion part and a second extrusion part, the first extrusion part is rotatably connected to the threaded part of the fixing screw, and the threaded part can rotate relative to the first extrusion part around its own axis; the fixing screw hole can be connected to one of the fixing screws, so that the first extrusion part enters the fixing channel and acts together with the inner wall of the fixing channel to clamp the elastic band passing through the fixing channel, or so that the second extrusion part can enter the fixing channel and act together with the inner wall of the fixing channel to clamp the rigid rod passing through the fixing channel.

[0007] By using two different fixing screws to connect with the fixing channel, the nail seat can fix the elastic band or the rigid rod in a way of fixing different connecting objects, so that the elastic band can be used to correct the patient in the first stage. If the patient's spine condition is relatively stable, the elastic band is left in the patient's body. If the patient's spine condition worsens, the fixing screw with the second extrusion part is used to replace the fixing screw with the first extrusion part, and the elastic band is replaced with a rigid rod. The rigid rod can provide a greater correction force to correct the spine than the elastic band. For example, when the patient is in adolescence, the elastic band with a relatively weak restraining effect on the spine can be used to correct the spine first, thereby reducing the restrictive effect of the connecting object on the patient's spine and avoiding the connection object from hindering the development of the patient's spine as much as possible; when the patient is an adult and the bone development is delayed, a secondary operation is performed to replace the elastic band with a rigid rod to enhance the correction effect on the patient's spine. In this process, there is no need to replace the nail seat and the ball head nail, which avoids the damage to the patient's spine caused by taking and placing the ball head nail during the secondary operation, thereby reducing the trauma of the operation to the patient.

[0008] In one embodiment of the present application, the nail seat includes two fixing channels and two fixing screw holes, the two fixing channels are respectively connected to a fixing screw hole, and the threads of the two fixing screws and the two fixing screw holes are the same.

[0009] The two fixing channels in the present application can fix two rigid rods, or two elastic bands, or one rigid rod, or one elastic band, so that appropriate fixing screws, appropriate types of connectors, and appropriate number of connectors can be selected according to surgical needs to correct the spine and meet different surgical needs.

[0010] In one embodiment of the present application, the extension directions of the two fixing channels are parallel to each other and are arranged in the installation plane.

[0011] The extension directions of the two fixing channels are parallel to each other. When the nail seat fixes two elastic bands or two rigid rods, the two connecting objects can cooperate to provide a larger correction force.

[0012] In one embodiment of the present application, a first plane is provided on the outer surface of the nail seat, the first plane is parallel to the installation plane, and two grooves are provided on the first plane, and the two grooves form two fixing channels.

[0013] By forming a fixing channel through grooves provided on the surface, the rigid rod or elastic band can be more easily installed in the fixing channel, so that the rigid rod or elastic band can be conveniently connected to multiple double-locking pedicle screws for fusion and non-fusion surgeries to perform spinal correction operations on patients.

[0014] In one embodiment of the present application, the nail seat is provided with a mounting hole for the ball stud to enter, and the axial direction of the mounting hole is perpendicular to the mounting plane.

[0015] The mounting hole is perpendicular to the mounting plane, so that the two fixing channels are perpendicular to the mounting hole. The two fixing channels are parallel, which reduces the height of the entire pedicle screw and the height occupied by the pedicle screw in the body.

[0016] In one embodiment of the present application, the nail seat is provided with a fixing channel and a fixing screw hole, and both fixing screws are provided with threads threadedly connected to the fixing screw holes. The fixing screw holes can be connected to one of the fixing screws so that the fixing screws and the fixing channel can work together to fix the elastic band or rigid rod.

[0017] The nail seat is provided with a fixing channel capable of fixing the elastic band or the rigid rod. By using different fixing screws, the elastic band or the rigid rod entering the fixing channel is fixed, thereby meeting the requirements of the surgery for the connection object.

[0018] In one embodiment of the present application, a fixing groove is provided on the outer surface of the nail seat, and the fixing groove forms a fixing channel; the groove walls on both sides of the fixing groove are provided with thread grooves, and the thread grooves are provided with threads, and the threads in the thread grooves on the groove walls on both sides form fixing screw holes.

[0019] In one embodiment of the present application, the fixing screw hole is arranged at the notch of the fixing groove, the axial direction of the fixing screw hole is the same as the depth direction of the fixing groove, and the first extrusion portion or the second extrusion portion can approach the bottom of the fixing groove to fix the elastic band or the rigid rod.

[0020] A spinal correction kit includes any one of the above-mentioned double-locking pedicle screws for fusion and non-fusion surgery, and also includes an elastic band and / or a rigid rod. The double-locking pedicle screws for fusion and non-fusion surgery are provided with multiple elastic bands or rigid rods that are connected in series with multiple double-locking pedicle screws for fusion and non-fusion surgery.

[0021] In one embodiment of the present application, the elastic band is a flat elastic band; the first extrusion portion and the inner wall of the fixing channel can extrude the elastic band along the thickness direction of the elastic band.

[0022] The present application has at least the following beneficial effects:

[0023] 1. By using two different fixing screws to connect with the fixing channel and fix different connecting objects, the nail seat can fix the elastic band or the rigid rod by replacing the fixing screws. The use of the elastic band or the rigid rod can be determined according to the patient's spinal condition. For example, when the patient is in adolescence, the elastic band with relatively weak spinal restraint can be used to correct the spine first, thereby reducing the restrictive effect of the connecting object on the patient's spine and avoiding the connection object hindering the development of the patient's spine as much as possible; when the patient is an adult and the bone development is delayed, an assessment is conducted to determine the patient's spinal correction condition. When the patient's correction condition is good, no surgery is required, and only the elastic band can be used to correct the spine; if the spinal correction of the elastic band is not ideal, a secondary operation is required to replace the elastic band with a rigid rod to enhance the correction effect on the patient's spine. In this process, there is no need to replace the nail seat and the ball head nail, so as to avoid damage to the patient's spine during the secondary operation when the ball head nail is removed and placed, thereby reducing the trauma of the operation to the patient.

[0024] 2. The two fixing channels in the present application can fix two rigid rods, or two elastic bands, or one rigid rod, or one elastic band, so as to fix the connection objects according to the surgical requirements and meet different surgical correction requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a structural schematic diagram of an exemplary implementation method when the nail seat in the present application is provided with a fixing groove;

[0026] Figure 2 It is a structural schematic diagram of an exemplary implementation of a strap fixing screw in the present application;

[0027] Figure 3 It is a structural schematic diagram of an exemplary implementation method when the threaded portion and the first extrusion portion are rotatably connected in the present application;

[0028] Figure 4 It is a structural schematic diagram of an exemplary implementation mode when the nail seat in the present application is provided with two fixing grooves;

[0029] Figure 5 It is a structural schematic diagram of a schematic implementation of the mounting hole of the nail seat in the present application;

[0030] Figure 6It is a structural schematic diagram of an exemplary implementation of the limit seat in the present application;

[0031] Figure 7 It is a structural schematic diagram of an exemplary implementation of two fixing grooves in the present application;

[0032] Figure 8 It is a structural schematic diagram of an exemplary embodiment of the connection between the nail seat and the ball stud in the present application;

[0033] Fig. 9 It is a structural schematic diagram of an exemplary implementation method when the nail seat in the present application is connected to two rigid rods;

[0034] Fig.10 It is a structural schematic diagram of an exemplary implementation method when the nail seat in the present application is connected to two elastic bands;

[0035] Fig.11 is a schematic structural diagram of an exemplary embodiment of the spine arrangement in the present application;

[0036] Fig.12 It is a structural schematic diagram of an exemplary implementation method of simultaneously connecting an elastic band and a rigid rod to a plurality of pedicle screws in the present application;

[0037] Fig.13 It is a structural schematic diagram of an exemplary embodiment of the present application in which a plurality of pedicle screws are simultaneously connected to an elastic band and two rigid rods;

[0038] Fig.14 It is a structural schematic diagram of an exemplary implementation method when a pedicle screw with one fixing channel and a pedicle screw with two fixing channels are used together;

[0039] Fig.15 The schematic diagram is a schematic structural diagram of an exemplary embodiment of a pedicle screw with a rigid rod and two fixation channels.

[0040] In the figure:

[0041] 101, fixing screw;

[0042] 201, fixing screw; 202, threaded portion; 203, first extrusion portion; 204, matching hole; 205, first limiting portion; 206, second limiting portion; 207, positioning protrusion;

[0043] 301, nail seat; 302, fixing groove; 303, fixing screw hole; 304, thread groove; 305, positioning groove; 306, main body; 307, first groove; 308, limit seat; 309, second groove; 310, working hole; 311, ball head groove; 312, first plane; 313, mounting hole;

[0044] 401, ball studs;

[0045] 501, rigid rod; 502, elastic band;

[0046] 601. Spine. DETAILED DESCRIPTION

[0047] In order to have a clearer understanding of the technical features, purposes and effects of the present application, the specific implementation methods of the present application are now described with reference to the accompanying drawings. The same reference numerals in the drawings represent components with the same structure or similar structures but the same functions.

[0048] In this document, “exemplary” means “serving as an example, instance or illustration”, and any diagram or implementation described in this document as “exemplary” should not be interpreted as a more preferred or more advantageous technical solution.

[0049] In order to simplify the drawings, only the parts related to the present application are schematically shown in each figure, and they do not represent the actual structure of the product. In addition, in order to simplify the drawings and facilitate understanding, in some figures, only one of the parts with the same structure or function is schematically drawn or marked.

[0050] See also Figures 1 to 15 Understand this application.

[0051] See also Figure 1 , a double-locking pedicle screw for fusion and non-fusion surgery, comprising a ball-head nail 401 and a nail seat 301 connected to the ball-head nail 401; the nail seat 301 is provided with a fixing channel and a fixing screw hole 303 connected to the side wall of the fixing channel, the outer surface of the nail seat 301 is provided with a fixing groove 302, the fixing groove 302 penetrates the nail seat, the fixing groove 302 forms a fixing channel, the elastic band 502 or the rigid rod 501 can enter the fixing groove 302 through the notch of the fixing groove 302, the fixing screw hole 303 is arranged at the notch of the fixing groove 302, the groove walls on both sides of the fixing groove 302 are provided with thread grooves 304, the thread grooves 304 are provided with threads, the thread grooves 304 on both sides of the fixing groove 302 form a fixing screw hole 303, and the axial direction of the fixing screw hole 303 is the same as the depth direction of the fixing groove 302; in one embodiment of the present application, the nail seat 301 is provided with a fixing groove 302 and a fixing screw hole 303.

[0052] The double-locking pedicle screw for fusion and non-fusion surgery also includes two fixing screws that can be threadedly connected to the fixing screw hole 303. Both fixing screws are provided with threads that are threadedly connected to the fixing screw hole 303. The fixing screw hole 303 can be connected to one of the fixing screws, so that the fixing screw and the fixing groove 302 can work together to fix the elastic band 502 or the rigid rod 501. The two fixing screws can be connected to the fixing screw hole 303 respectively. The two fixing screws are respectively provided with a first extrusion portion 203 and a second extrusion portion, see Figures 2 to 4 One of the fixing screws is provided with a first extrusion portion 203 and a threaded portion 202, and the first extrusion portion 203 is rotatably connected to the threaded portion 202 of the fixing screw. The other fixing screw is provided with a second extrusion portion and a threaded portion 202, and the threaded portion 202 is provided with a thread that can be threadedly connected to the fixing screw hole 303, so that both fixing screws can be threadedly connected to the fixing screw hole 303.

[0053] Technicians in the technical field to which the present application belongs can understand that there are many ways to realize the rotational connection between the first extrusion portion 203 and the threaded portion 202 in the present application. In order to better describe the present application, the fixing screw provided with the first extrusion portion 203 is named as a fixed band screw 201, and the fixing screw provided with the second extrusion portion is named as a fixed rod screw 101. The threads provided by the fixed band screw 201 and the fixed rod screw 101 can be threadedly connected with the threads provided by the two fixing grooves 302. The fixed rod screw 101 is used to fix the rigid rod 501, and the fixed band screw 201 is used to fix the elastic band 502. The second extrusion portion of the fixed rod screw 101 is the end face of the fixed rod screw 101.

[0054] See also Figures 1 to 3The fixing screw 201 includes a threaded portion 202 and a first extrusion portion 203, the threaded portion 202 and the first extrusion portion 203 are rotatably connected, and the first extrusion portion 203 is provided with a matching hole 204; the threaded portion 202 is provided with a threaded rod that can be threadedly connected to the fixing screw hole 303 and a matching rod that can be inserted into the matching hole 204, the matching rod, the threaded portion 202, and the matching hole 204 are coaxially arranged, the matching rod can rotate around its own axis in the matching hole 204, the aperture of the matching hole 204 is smaller than the outer diameter of the threaded rod, the length of the matching rod is not greater than the depth of the matching hole 204, the threaded portion 202 can rotate around its own axis relative to the first extrusion portion 203, when the threaded portion 202 is threadedly connected to the fixing screw hole 303 When the threaded portion 202 can rotate relative to the first extrusion portion 203, the first extrusion portion 203 can not rotate relative to the fixing groove 302 under the action of the matching rod and the matching hole 204, and the length of the matching rod is not greater than the depth of the matching hole 204, the outer diameter of the threaded rod is greater than the aperture of the matching hole 204, the threaded portion 202 can be pressed against the orifice of the matching hole 204 of the first extrusion portion 203 through the threaded rod, and when the threaded rod is threadedly connected to the fixing screw hole 303, the threaded portion 202 applies a force to the first extrusion portion 203 close to the fixing groove 302 through the threaded rod, so that the first extrusion portion 203 and the fixing groove 302 work together to fix the elastic band 502.

[0055] Technicians in the technical field to which the present application belongs can understand that there are other ways to realize the rotational connection between the threaded portion 202 and the first extrusion portion 203. For example, the threaded portion 202 and the first extrusion portion 203 are split structures. After the first extrusion portion 203 is placed in the fixing groove 302, the threaded portion 202 is threadedly connected to the fixing screw hole 303, so that the threaded portion 202 abuts against the first extrusion portion 203 and moves relative to each other. By squeezing the first extrusion portion 203, the elastic band 502 is squeezed into the fixing groove 302, and the elastic band 502 can be fixed under the joint action of the threaded portion 202 and the fixing groove 302.

[0056] The rotational connection between the threaded portion 202 and the first extrusion portion 203 can prevent the first extrusion portion 203 and the surface of the elastic band 502 from rotating relative to each other during the process of the threaded portion 202 being threadedly connected to the fixing screw hole 303, so that the first extrusion portion 203 rubs and grinds the elastic band 502, causing deformation of the surface of the elastic band 502, thereby preventing the first extrusion portion 203 from causing damage to the elastic band 502, thereby ensuring the service life of the elastic band 502 and reducing the possibility of the elastic band 502 breaking, so that the first extrusion portion 203 and the bottom of the fixing groove 302 can firmly fix the elastic band 502, thereby meeting the requirements for the elastic band 502 under complex physical conditions in the human body.

[0057] See also Figure 2 The first extrusion part 203 is provided with two first limiting parts 205 and two second limiting parts 206. The two first limiting parts 205 can respectively fit the groove wall on one side of the fixing groove 302, and the two second limiting parts 206 can respectively fit the groove wall of a thread groove 304 to limit the rotation of the first extrusion part 203 in the first groove 307. When used in complex situations in the body, since the bending movements of the human spine are various, the magnitude and direction of the force applied by the spine to the elastic band 502 are relatively complex, so that the elastic band 502 applies the force applied to the first extrusion part 203 The force acting on the elastic band 502 is relatively complex, and since the elastic band 502 itself undergoes elastic deformation after being subjected to force, the shape of the elastic band 502 changes, so the stability of the first extrusion portion 203 in the body is required to be relatively high. The first limiting portion 205 and the second limiting portion 206 can limit the lateral movement of the first extrusion portion 203 in the fixed groove 302, and the threaded portion 202 limits the first extrusion portion 203 from being away from the bottom of the fixed groove 302, so that the first extrusion portion 203 can stably cooperate with the bottom of the fixed groove 302 to clamp the elastic band 502.

[0058] The fixing screw hole 303 can be threadedly connected with the fixing band screw 201 or the fixing rod screw 101, so that the first extrusion portion 203 enters the fixing groove 302 and cooperates with the inner wall of the fixing groove 302 to clamp the elastic band 502 passing through the fixing groove 302, or so that the second extrusion portion can enter the fixing groove 302 and cooperate with the inner wall of the fixing groove 302 to clamp the rigid rod 501 passing through the fixing groove 302.

[0059] After evaluation by a doctor, the correction force required for the spine of some patients can be met by a rigid rod 501 or an elastic band 502. After adulthood, another evaluation is conducted to determine whether the elastic band 502 needs to be replaced with a rigid rod 501. If not, no surgery is performed, and the elastic band or rigid rod is no longer removed from the patient's body. If necessary, the rigid rod 501 can be fixed using only a fixing screw. When the patient reaches adulthood and undergoes a second surgery, only the fixing screw needs to be replaced to complete the replacement of the elastic band 502 in the patient's body with the rigid rod 501. There is no need to replace the nail seat 301, the ball head nail 401 and other components, thereby avoiding the secondary insertion of the ball head nail 401 and greatly reducing the damage to the patient caused by the second surgery.

[0060] Those skilled in the art of the present application can understand that the number of the fixing channel and the fixing screw hole 303 in the present application is not limited to one, but can also be other ways. For example, in one embodiment of the present application, the nail seat 301 includes two fixing grooves 302 and two fixing screw holes 303, and the two fixing grooves 302 are respectively connected to one fixing screw hole 303.

[0061] The doctor can select the appropriate fixation method through evaluation. For example, in adolescence, only one elastic band 502 is needed on one side of the patient's spine. After adulthood, it needs to be replaced with two rigid rods 501. Through the two fixing channels and two fixing screw holes 303 provided in the present application, only one band screw 201 needs to be replaced with two rod screws 101. There is no need to replace other parts, thus avoiding the harm to the patient caused by repeated replacement of the ball stud 401.

[0062] See also Figure 1 In one embodiment of the present application, the extension directions of the two fixing grooves 302 are parallel to each other and are arranged in the installation plane. When the two fixing grooves 302 are both installed with elastic bands 502 or rigid rods 501, see Fig. 9 , Fig.10 The two elastic bands 502 or rigid rods 501 are located in the same installation plane, and the elastic bands 502 or rigid rods 501 fixed by the two fixing grooves 302 on the same nail seat 301 can provide correction forces in the same direction to the spine, and compared with one elastic band 502 or rigid rod 501, the two elastic bands 502 or rigid rods 501 can provide greater correction forces to correct the spine to achieve better correction effects.

[0063] Of course, the pedicle screw with two fixing channels in the present application can also fix only one elastic band 502 or one rigid rod 501, and the appropriate number of connectors is selected according to the surgical requirements.

[0064] See also Figure 1 In one embodiment of the present application, a first plane 312 is provided on the outer surface of the nail seat 301, the first plane 312 is parallel to the installation plane, and the first plane 312 is provided with two fixing grooves 302. The two fixing grooves 302 are provided in the first plane 312, and the doctor can more easily align the elastic band 502 or the rigid rod 501 with the fixing grooves 302 provided in the first plane 312, so that the elastic band 502 or the rigid rod 501 can be more conveniently installed in the fixing grooves 302, thereby reducing the difficulty of installation.

[0065] See also Figure 4 , Figure 6 In one embodiment of the present application, the nail seat 301 is provided with a mounting hole 313 for the ball stud 401 to enter, and the axial direction of the mounting hole 313 is perpendicular to the mounting plane.

[0066] Since the mounting plane is perpendicular to the mounting hole 313, the ball stud 401 can be perpendicular to the mounting plane, so that the fixing groove 302 is arranged in a direction perpendicular to the ball stud 401, see Figure 7 , reducing the overall height of the pedicle screw, thereby improving the subcutaneous adaptability of the present application.

[0067] Of course, the relative positions of the two fixing grooves 302 can be in other ways, not just limited to the two fixing grooves 302 being parallel to each other, and the heights of the two fixing grooves 302 relative to the ball stud 401 can also be different, which will not be elaborated here.

[0068] See also Figures 4 to 7 In one embodiment of the present application, the nail seat 301 also includes a limit seat 308 arranged in the mounting hole 313, the mounting hole 313 is a stepped hole, and the mounting hole 313 decreases in the direction away from the fixing groove 302, so that the mounting hole 313 limits the limit seat 308 from downwardly detaching from the mounting hole 313, and the limit seat 308 is provided with a ball head groove 311 for the ball head of the ball head nail 401 to enter, and the limit seat 308 is also provided with a working hole 310 connected to the groove bottom of the ball head groove 311, the ball head groove 311 is coaxially arranged with the working hole 310, and the ball head groove 311 is connected to the fixing groove 302 through the working hole 310. The outer diameter of the limit seat 308 is larger than the aperture of the mounting hole 313. When the ball head of the ball stud 401 enters the ball head groove 311, the limit seat 308 cannot leave the fixing groove 302 through the mounting hole 313 because the outer diameter of the limit seat 308 is larger than the aperture of the mounting hole 313. Therefore, the limit seat 308 prevents the ball stud 401 from leaving the fixing groove 302 through the mounting hole 313. When the screw enters the fixing screw hole 303, the fixing screw squeezes the limit seat 308 and fixes it in the fixing groove 302.

[0069] See also Figure 6 The nail seat 301 also includes a main body 306 with a first groove 307, and the mounting hole 313 is connected to the first groove 307; the nail seat 301 also includes a limit seat 308 arranged at the mounting hole 313, the limit seat 308 is provided with a ball head groove 311 for the ball head of the ball head nail 401 to enter, the limit seat 308 is arranged in the first groove 307, the limit seat 308 is provided with a second groove 309, the ball head groove 311 is arranged opposite to the second groove 309, and the second groove 309 and the first groove 307 form a fixed groove 302 for the rigid rod 501 or the elastic band 502 to pass through.

[0070] See also Figure 3 , Figure 6 The limiting seat 308 is also provided with a positioning groove 305, the bottom of the positioning groove 305 is a spherical surface, the bottom of the positioning groove 305 is provided with a working hole 310, and the first extrusion portion 203 is provided with a positioning protrusion 207 that can enter the positioning groove 305. The setting of the positioning groove 305 and the positioning protrusion 207 can firmly fix the elastic band and enhance the fixing effect of the pedicle screw on the elastic band.

[0071] Of course, those skilled in the art of the present application can understand that the fixing screw hole 303 in the present application can also have other settings, such as directly setting the fixing screw hole 303 at other positions of the nail seat 301, the fixing screw hole 303 is not set at the notch of the fixing groove 302, and the fixing screw hole 303 connects the side wall of the fixing groove 302 with the outside world, which will not be repeated here. The fixing channel can also be implemented in other ways, such as the fixing channel is a through hole that passes through the nail seat 301, and the rigid rod 501 or the elastic band 502 can pass through the nail seat 301 through the through hole, and multiple nail seats 301 are connected in series, so as to play a role in correcting the spine, and the fixing screw hole 303 is connected to the side wall of the through hole, so that the rigid rod 501 or the elastic band 502 connected to the nail seat 301 can be fixed by using a screw through the fixing screw hole 303.

[0072] See also Fig. 9 , Fig.10 A spinal correction kit includes any one of the above-mentioned double-locking pedicle screws for fusion and non-fusion surgery, and also includes an elastic band 502 and / or a rigid rod 501. The double-locking pedicle screws for fusion and non-fusion surgery are provided with multiple elastic bands 502 or rigid rods 501 are connected in series. During the operation, the multiple pedicle screws are connected to the patient's spine and arranged along the extension direction of the spine. The elastic band 502 or the rigid rod 501 is used to connect the pedicle screws in series, so that the elastic band 502 or the rigid rod 501 applies a force to the spine through the pedicle screws to perform spinal correction.

[0073] The present application provides two fixing channels and two fixing screw holes 303, thereby making the surgical method applicable to the present application more flexible. For example, in the first stage, the patient needs to use two elastic bands 502 to correct the spine, and in the second stage, only one rigid rod 501 is needed to correct the spine; or in the first stage, the patient needs to use one elastic band 502 to correct the spine, and in the second stage, two rigid rods 501 are needed to correct the spine; or in the first stage, two elastic bands 502 are needed to correct the spine, and in the second stage, two rigid rods 501 are needed to correct the spine; or in the first stage, the patient needs to use two rigid rods 501 to correct the spine. Of course, there are other ways of use.

[0074] The pedicle screw with a single fixation channel and the pedicle screw with two fixation channels in the present application can be used in combination, see Fig.11 The arrangement direction of the vertebrae 601 is described as shown in the figure. During the first stage, the lower spine ( Fig.11 The curvature of the spine (a in the figure) is small and is corrected using elastic band 502. Fig.11 The degree of bending (the position indicated by b in FIG. 1 ) is relatively large and needs to be corrected by using a rigid rod 501. Fig.12 The pedicle screws with a single fixing channel and the pedicle screws with two fixing channels can be used in combination. An elastic band 502 is used to correct the side of the lower spine extension direction with a smaller degree of deformity, and a pedicle screw with two fixing channels is used to correct the side of the upper spine extension direction. The pedicle screws with two fixing channels fix a rigid rod 501. As time goes by, the second stage begins. In the second stage, the doctor re-evaluates the patient's spinal condition. If the rigid rod 501 does not have a good correction effect on the patient's spine, a pedicle screw with two fixing channels is used to fix another rigid rod 501, so that the pedicle screws are changed from fixing one rigid rod 501 to fixing two rigid rods 501. The two rigid rods 501 can provide greater correction force to correct the spine. See Fig.13 If the correction force provided by an elastic band 502 has a weak limiting effect on spinal deformity, the fixed band screw 201 is replaced with a fixed rod screw 101, and the fixed nail rigid rod 501 is fixed, thereby replacing the elastic band 502 with a rigid rod 501, see Fig.14 The pedicle screw with one fixing channel and the pedicle screw with two fixing channels fix the same rigid rod 501 , and at the same time, the pedicle screw with two fixing channels fixes two rigid rods 501 .

[0075] The present application realizes that the pedicle screw can fix the elastic band 502 or the rigid rod 501 by replacing the pedicle screw with the fixed rod screw 101 and the fixed band screw 201. The doctor can use the elastic band 502 or the rigid rod 501 according to the patient's needs, or use the elastic band 502 or the rigid rod 501 at the same time to correct the patient's spine.

[0076] The rigid rod 501 and the elastic band 502 are connectors used by doctors during spinal correction treatment. Doctors can select a pedicle screw to connect one or two connectors according to their needs, and can replace the fixed band screw 201 and the fixed rod screw 101. The pedicle screw can be connected to the rigid rod 501 or the elastic band 502, so that according to their needs, in the first stage, a pedicle screw can be selected to connect one or two connectors. In the second stage, the doctor will evaluate again and choose whether to replace the connector or change the number of connectors connected to a pedicle screw. See Fig.10 , the pedicle screw with two fixing channels fixes two elastic bands 502, and by replacing the fixing screws, the fixing band screw 201 is replaced with the fixing rod screw 101, see Fig.15, a pedicle screw fixes a rigid rod 501. The present application makes the surgical method more flexible by replacing fixing screws of different structures. When replacing the connecting object, there is no need to remove the ball head nail 401 of the pedicle screw from the spine. During the process of replacing the connecting object, there is no situation where the ball head nail 401 is repeatedly inserted into the spine, thereby reducing the harm of the operation to the patient. By replacing different fixing screws, different connecting objects can be replaced to meet the surgical needs of different patients, which reduces the difficulty of the second stage of the operation and increases the flexibility of the operation.

[0077] In one embodiment of the present application, see Fig.10 The elastic band 502 is a flat elastic band 502; the first extrusion portion 203 and the inner wall of the fixing channel can extrude the elastic band 502 along the thickness direction of the elastic band 502. The elastic band 502 is a flat elastic band 502, which reduces the elastic deformation degree of the elastic band 502 in the thickness direction, increases the contact area between the elastic band 502 and the first extrusion portion 203 and the fixing channel, and ensures the connection strength between the elastic band 502 and the pedicle.

[0078] It should be understood that although this specification is described according to various implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

[0079] The series of detailed descriptions listed above are merely specific descriptions of feasible embodiments of the present application. They are not intended to limit the scope of protection of the present application. Any equivalent implementation scheme or changes that do not deviate from the technical spirit of the present application, such as combination, division or repetition of features, should be included in the scope of protection of the present application.

Claims

1. A double-locking pedicle screw for fusion and non-fusion surgery, characterized in that: It includes a ball stud and a stud seat connected to the ball stud; The nail seat is provided with a fixing channel and a fixing screw hole communicating with the side wall of the fixing channel; The double-locking pedicle screw for fusion and non-fusion surgery also includes two fixing screws that can be threadedly connected to the fixing screw hole, and the two fixing screws are respectively provided with a first extrusion portion and a second extrusion portion, the first extrusion portion is rotatably connected to the threaded portion of the fixing screw, and the threaded portion can rotate around its own axis relative to the first extrusion portion; The fixing screw hole can be connected to any one of the fixing screws so that the first extrusion portion can enter the fixing channel and cooperate with the inner wall of the fixing channel to clamp the elastic band passing through the fixing channel, and the second extrusion portion can enter the fixing channel and cooperate with the inner wall of the fixing channel to clamp the rigid rod passing through the fixing channel.

2. A double-locking pedicle screw for fusion and non-fusion surgery according to claim 1, characterized in that: The nail seat includes two fixing channels and two fixing screw holes, and the two fixing channels are respectively connected to one fixing screw hole.

3. A double-locking pedicle screw for fusion and non-fusion surgery according to claim 2, characterized in that: The extension directions of the two fixing channels are parallel to each other and are arranged in the installation plane.

4. A double-locking pedicle screw for fusion and non-fusion surgery according to claim 3, characterized in that: The outer surface of the nail seat is provided with a first plane, the first plane is parallel to the installation plane, and the first plane is provided with two grooves, and the two grooves form the two fixing channels.

5. A double-locking pedicle screw for fusion and non-fusion surgery according to claim 3, characterized in that: The nail seat is provided with a mounting hole for the ball stud to enter, and the axial direction of the mounting hole is perpendicular to the mounting plane.

6. A double-locking pedicle screw for fusion and non-fusion surgery according to claim 1, characterized in that: The nail seat is provided with a fixing channel and a fixing screw hole.

7. A double-locking pedicle screw for fusion and non-fusion surgery according to claim 1, characterized in that: The outer surface of the nail seat is provided with a fixing groove, and the fixing groove forms the fixing channel; The groove walls on both sides of the fixing groove are provided with thread grooves, and threads are provided in the thread grooves. The threads in the thread grooves on the groove walls on both sides form the fixing screw holes.

8. A double-locking pedicle screw for fusion and non-fusion surgery according to claim 7, characterized in that: The fixing screw hole is arranged at the notch of the fixing groove, the axial direction of the fixing screw hole is the same as the depth direction of the fixing groove, and the first extrusion part or the second extrusion part can approach the bottom of the fixing groove to fix the elastic band or the rigid rod.

9. A spinal correction kit, characterized in that: A double-locking pedicle screw for fusion and non-fusion surgery comprising any one of claims 1 to 8, and further comprising an elastic band and / or a rigid rod, wherein a plurality of the double-locking pedicle screws for fusion and non-fusion surgery are provided, and the elastic band or the rigid rod are connected in series with a plurality of the double-locking pedicle screws for fusion and non-fusion surgery.

10. The spinal correction kit according to claim 9, characterized in that: The elastic band is a flat elastic band; The first pressing portion and the inner wall of the fixing channel can press the elastic band along the thickness direction of the elastic band.

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