Double-groove pedicle screw for fusion and non-fusion operations

Abstract

The utility model discloses a double-groove pedicle screw for fusion and non-fusion operations. The double-groove pedicle screw comprises a rod fixing screw, a belt fixing screw, a ball head screw and a screw base connected with the ball head screw. The screw seat is provided with two parallel fixing channels in an array mode in one direction, the fixing channels penetrate through the screw seat, the screw seat is further provided with fixing screw holes communicated with the side walls of the fixing channels, the two fixing channels are provided with fixing screw holes respectively, and the rod fixing screw and the belt fixing screw can be in threaded connection with the fixing screw holes; the belt fixing screw comprises an extrusion part and a thread part rotationally connected with the extrusion part, threads in threaded connection with the fixing screw hole are arranged on the side wall of the thread part, the thread part rotates around the axis of the thread part, when the thread part is in threaded connection with the fixing screw hole, the extrusion part enters the fixing channel, and the inner wall of the fixing channel can limit rotation of the extrusion part along with the thread part. By means of the rod fixing screws and the belt fixing screws, a rigid rod or an elastic belt can be fixed, at most two connecting objects can be fixed through the two fixing channels, and an operation is more flexible.

Description

Technical Field

[0001] The present application belongs to the field of medical device technology, and specifically relates to a double-groove 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, internal fixation and bone grafting and fusion. That is, after correction during the operation, a rigid connecting rod (titanium rod or cobalt-chromium-molybdenum rod or other rigid rods) is used to connect the corrected spine together, supplemented by autologous bone or allogeneic bone to achieve complete fusion of the surgical segments, which 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.

[0005] Depending on the degree of spinal deformity, some patients may not need to replace connectors or adjust the number of connectors in the first and second stages; some patients may only need one connector to meet the correction needs in the first stage. As time goes by, two connectors are needed to meet the correction needs in the second stage. For example, patients only need to use one elastic band to correct the spine in the first stage, but as time goes by, due to factors such as the patient's wrong posture, the degree of scoliosis increases. In the second stage, the patient may need a pedicle screw to fix two elastic bands or two rigid rods, but replacing pedicle screws and repeating pedicle screw insertion is unnecessary for patients. This operation method will greatly increase the patient's trauma and affect the patient's recovery. When the screw is inserted again, the ball head screw may cause cracks in the spine. Re-insertion of the screw has a higher surgical risk and is not conducive to the patient's health. It is also necessary to consider the interference problem of two identical connectors or two different connectors as the spine bends. Utility Model Content

[0006] In order to increase the flexibility of surgery, select appropriate connectors and the appropriate number of connectors at different times, and reduce the risk of spinal injuries during and after surgery, the present application provides a double-groove pedicle screw for fusion and non-fusion surgery.

[0007] A double-groove pedicle screw for fusion and non-fusion surgery, comprising a fixed rod screw, a fixed band screw, a ball nail, and a nail seat connected to the ball nail; the nail seat is provided with two mutually parallel fixing channels in an array along one direction, the fixing channels penetrate the nail seat, the nail seat is also provided with a fixing screw hole connected to the side wall of the fixing channel, the two fixing channels are respectively provided with the fixing screw holes, the fixed rod screw and the fixed band screw can be threadedly connected to the fixing screw holes; the fixed band screw comprises an extrusion part and a threaded part plug-connected to the extrusion part, the side wall of the threaded part is provided with a thread threadedly connected to the fixing screw hole, the extrusion part can rotate relative to the extrusion part around the axis of the threaded part, the threaded part rotates around its own axis, and when threadedly connected to the fixing screw hole, the extrusion part enters the fixing channel, and the inner wall of the fixing channel can limit the extrusion part from rotating with the threaded part.

[0008] In one embodiment of the present application, the extrusion portion is provided with a first curved surface, the fixing channel is provided with a second curved surface, the second curved surface is arranged opposite to the fixing screw hole, and when the threaded portion is threadedly connected with the fixing screw hole, the first curved surface is close to the second curved surface, and the first curved surface is parallel to the second curved surface.

[0009] In one embodiment of the present application, the length of the first curved surface is equal to the length of the second curved surface.

[0010] In one embodiment of the present application, the second curved surface is provided with a positioning groove, and the depth direction of the positioning groove is the same as the axial direction of the fixing screw hole; the extrusion portion is provided with a positioning protrusion, and when the first curved surface approaches the second curved surface, the positioning protrusion can be inserted into the positioning groove.

[0011] In one embodiment of the present application, the inner diameter of the positioning groove gradually decreases along the depth direction of the positioning groove; the outer diameter of the positioning protrusion gradually decreases along the height direction of the positioning protrusion; and the positioning protrusion can be inserted into the positioning groove.

[0012] In one embodiment of the present application, the positioning groove is arranged at the center of the second curved surface.

[0013] In one embodiment of the present application, the extrusion portion is provided with a matching hole, the threaded portion is provided with a threaded rod that can be threadedly connected to the fixing screw hole and a matching rod that can be inserted into the matching hole, the matching rod can rotate in the matching hole, the threaded rod and the matching rod are coaxially arranged, the aperture of the matching hole is smaller than the outer diameter of the threaded rod, and the length of the matching rod is not greater than the depth of the matching hole.

[0014] In one embodiment of the present application, the mating rod is a round rod, and the mating hole is a round hole; one end of the mating rod is connected to a threaded rod, and the other end is a rotating end, and the diameter of the rotating end is equal to the aperture of the mating hole.

[0015] In one embodiment of the present application, the mating hole includes an inlet section, a clamping section, and a rotating section along its depth direction, and the inner diameter of the clamping section is larger than the inner diameter of the rotating section and the inner diameter of the inlet section; one end of the mating rod is connected to a threaded rod, and the other end is a rotating end, and a clamping mating section is provided between the two ends of the mating rod, and the outer diameter of the clamping mating section is smaller than the diameter of the rotating end; a clamping ring is provided between the mating rod and the mating hole, and the outer diameter of the clamping ring is larger than the diameter of the inlet section, and the inner diameter of the clamping ring is smaller than the outer diameter of the rotating end; the rotating end enters the rotating section, and the clamping mating section is connected to the clamping section through the clamping ring, and the clamping ring restricts the mating rod from leaving the mating hole.

[0016] In one embodiment of the present application, the fixing channel is a fixing groove arranged on the surface of the nail seat, the groove walls on both sides of the fixing groove are provided with thread grooves, the thread grooves are provided with threads, and the two thread grooves form a fixing screw hole; the extrusion part is provided with two first limiting parts and two second limiting parts, the two first limiting parts can respectively fit into a groove wall of the fixing groove, and the two second limiting parts can respectively fit into a groove wall of a thread groove.

[0017] The present application has at least the following beneficial effects:

[0018] 1. The threads of the band screw and the rod screw are the same as those of the two fixing screw holes, and the band screw and the rod screw can be connected to the two fixing screw holes, that is, the two fixing screw holes can fix both the band screw and the rod screw, and the two fixing channels can fix the elastic band or the rigid rod, so one pedicle screw can fix at most two elastic bands or the rigid rod, so according to the needs of the operation, the elastic band or the rigid rod can be selected, and the appropriate number of connectors can be selected. For example, in the first stage, the patient's condition only needs one pedicle screw to fix one or two elastic bands for spinal treatment, but as time goes by, the patient's condition requires one or two rigid rods for treatment. In this process, only the band screw threadedly connected to the fixing screw hole needs to be replaced with a rod screw to complete the replacement of the connector. Alternatively, in the first stage, one elastic band or one rigid rod is needed, and in the second stage, two elastic bands or rigid rods are needed, which can be achieved by adjusting the number of band screws or rod screws.

[0019] For example, when an adolescent patient reaches adulthood, if the elastic band does not have an optimistic correction effect on the patient, the band screw is removed, and the rigid rod is connected to the pedicle screw using a rod screw, and the elastic band is replaced with a rigid rod. During this process, only the band screw or the rod screw needs to be replaced to complete the replacement of the connection. There is no need to remove the ball nail, thus avoiding repeated insertion of the ball nail into the spine and reducing surgical trauma and surgical risks.

[0020] Of course, if an elastic band or a rigid rod can meet the patient's correction needs, then there is no need to replace the connector or change the number of connectors. The present application uses two fixing channels and band fixing screws and rod fixing screws to make the surgical method for patients in the second stage more flexible.

[0021] 2. The extrusion part is rotationally connected to the threaded part. When the threaded part rotates and is threadedly connected to the fixing screw hole, the threaded part rotates relative to the nail seat, and the extrusion part that extrude the elastic band remains stationary relative to the nail seat, thereby avoiding the extrusion part from rotating relative to the elastic band, avoiding the extrusion part from rubbing the surface of the elastic band, causing wrinkles on the surface of the elastic band, and affecting the mechanical properties of the elastic band. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural schematic diagram of an exemplary implementation of the present application;

[0023] Figure 2 It is a structural schematic diagram of an exemplary implementation of a strap fixing screw in the present application;

[0024] Figure 3 It is a structural schematic diagram of an exemplary implementation of the matching hole in the present application;

[0025] Figure 4 is a schematic structural diagram of an exemplary implementation of the positioning protrusion in the present application;

[0026] Figure 5 is a schematic structural diagram of a schematic implementation of the positioning groove in the present application;

[0027] Figure 6 It is a structural schematic diagram of an exemplary implementation method when the strap fixing screw in the present application is installed in the fixing groove;

[0028] Figure 7 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;

[0029] Figure 8 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;

[0030] Fig. 9 is a schematic diagram of one illustrative embodiment of a spinal alignment;

[0031] Fig.10 It is a structural schematic diagram of an exemplary implementation method when a double-locking pedicle screw is provided with a fixing band screw and a fixing rod screw at the same time.

[0032] In the figure:

[0033] 101, fixing screw;

[0034] 201, fixing screw; 202, threaded portion; 203, threaded rod; 204, matching rod; 205, rotating end; 206, extruding portion; 207, matching hole; 208, inlet section; 209, clamping section; 210, rotating section; 211, clamping ring; 212, first limiting portion; 213, second limiting portion; 214, positioning protrusion; 215, first curved surface;

[0035] 301, nail seat; 302, fixing groove; 303, fixing screw hole; 304, thread groove; 305, positioning groove; 306, second curved surface;

[0036] 401, ball studs;

[0037] 501. Rigid rod; 502. Elastic band. DETAILED DESCRIPTION

[0038] 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.

[0039] 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.

[0040] 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.

[0041] See also Figures 1 to 10 Understand this application.

[0042] See also Figure 1 A double-groove pedicle screw for fusion and non-fusion surgery, comprising a rod screw 101, a band screw 201, a ball stud 401, and a screw seat 301 connected to the ball stud 401; the screw seat 301 is provided with two mutually parallel fixing channels in an array along one direction, see Figure 1 The fixing channel is a fixing groove 302 arranged on the surface of the nail seat 301, and the fixing channel passes through the nail seat 301. The nail seat 301 is also provided with a fixing screw hole 303 connected to the side wall of the fixing channel, and the fixing screw hole 303 is arranged at the notch of the fixing groove 302. The two fixing channels are respectively provided with fixing screw holes 303, and the fixing rod screw 101 and the fixing band screw 201 can be threadedly connected with the fixing screw holes 303. The two fixing channels can fix two rigid rods or two elastic bands at the same time, or in some cases the rigid rod and the elastic band are used together. Of course, one of the fixing channels can also be used to fix a rigid rod or an elastic band.

[0043] The two fixing channels are arranged parallel to each other, so that when multiple double-slot pedicle screws are used to fix two connecting objects, it is convenient to align the multiple fixing channels, or to avoid interference between the two connecting objects fixed by the two fixing channels during the extension process. In particular, after the patient uses this application, if a collision occurs between the rigid rod and the elastic band when the patient's spine is bent, it is very easy to cause displacement of the pedicle screws or other situations that cause tissue damage.

[0044] See also Figure 1 , Figure 2The fixing screw 201 includes an extrusion portion 206 and a threaded portion 202 plugged into the extrusion portion 206. The side wall of the threaded portion 202 is provided with a thread threadedly connected to the fixing screw hole 303. The extrusion portion 206 can rotate relative to the threaded portion 202 around the axis of the threaded portion 202. The extrusion portion 206 enters the fixing channel. The threaded portion 202 rotates around its own axis. When threadedly connected to the fixing screw hole 303, the threaded portion 202 pushes the extrusion portion 206 into the fixing channel. The plug-in connection between the extrusion portion 206 and the threaded portion 202 enables the threaded portion 202 to stably apply a force to the extrusion portion 206, and the inner wall of the fixing channel can limit the extrusion portion 206 from rotating with the threaded portion 202.

[0045] See also Figure 1 , Figure 7 The rod fixing screw 101 can be threadedly connected with the fixing screw hole 303, and the rod fixing screw 101 extends into the fixing channel and contacts the side wall of the rigid rod 501 passing through the fixing channel, so that the rod fixing screw 101 and the fixing channel work together to fix the rigid rod 501;

[0046] See also Figure 1 , Figure 8 The threaded portion 202 of the fixing screw 201 can be threadedly connected with the fixing screw hole 303. When the threaded portion 202 is threadedly connected with the fixing screw hole 303, the extrusion portion 206 extends into the fixing channel, contacts the elastic band 502 in the fixing channel, and fixes the elastic band 502 together with the inner wall of the fixing channel; in this process, due to the rotational connection between the threaded portion 202 and the extrusion portion 206, when the threaded portion 202 rotates relative to the nail seat 301, the extrusion portion 206 does not rotate relative to the nail seat 301, thereby avoiding the extrusion portion 206 from rotating relative to the elastic band 502, avoiding the extrusion portion 206 from rubbing the surface of the elastic band 502, causing wrinkles on the surface of the elastic band 502, and affecting the mechanical properties of the elastic band 502.

[0047] See also Figures 1 to 3In one embodiment of the present application, the extrusion portion 206 is provided with a matching hole 207; the threaded portion 202 is provided with a threaded rod 203 that can be threadedly connected to the fixing screw hole 303 and a matching rod 204 that can be inserted into the matching hole 207, the matching rod 204 and the matching hole 207 are coaxially arranged, the matching rod 204 can rotate in the matching hole 207, the threaded rod 203 and the matching rod 204 are coaxially arranged, the aperture of the matching hole 207 is smaller than the outer diameter of the threaded rod 203, and the length of the matching rod 204 is not greater than the depth of the matching hole 207, so that when the extrusion portion 206 squeezes the elastic band 5 02, the threaded rod 203 can abut against the hole opening of the matching hole 207. Since the threaded rod 203 can be threadedly connected with the fixing screw hole 303, when the threaded rod 203 rotates, a force is applied to the extrusion part 206 close to the fixing channel through the extrusion part 206. Since the aperture of the matching hole 207 is smaller than the outer diameter of the threaded rod 203, when the force is applied to the elastic band, the threaded rod 203 applies the force to the extrusion part 206 in a larger range to ensure the stability of the extrusion process. Finally, the extrusion part 206 and the fixing channel work together to fix the elastic band 502.

[0048] Furthermore, the mating rod 204 is a round rod, and the mating hole 207 is a round hole; one end of the mating rod 204 is connected to the threaded rod 203, and the other end is a rotating end 205, and the diameter of the rotating end 205 is equal to the aperture of the mating hole 207. Therefore, through the shape design of the mating rod 204 and the mating hole 207, the mating rod 204 can rotate more smoothly in the mating hole 207, and at the same time, the mating hole limits the radial displacement of the rotating end to ensure the smoothness of the rotation.

[0049] Technicians in the technical field to which the present application belongs can understand that the method for realizing the rotation of the mating rod 204 in the mating hole 207 in the present application is not limited to the method that the mating rod 204 is a round rod and the mating hole 207 is a round hole, but it can also be the method that the cross-section of the mating rod 204 and the cross-section of the mating hole 207 are elliptical. Of course, it can also be other methods, which will not be repeated here, as long as the mating rod 204 can be inserted into the mating hole 207 and the mating rod 204 can rotate in the mating hole 207 around its own axis.

[0050] See also Figure 3Furthermore, the matching hole 207 includes an inlet section 208, a clamping section 209, and a rotating section 210 along its depth direction, and the inner diameter of the clamping section 209 is larger than the inner diameter of the rotating section 210 and the inner diameter of the inlet section 208; one end of the matching rod 204 is connected to the threaded rod 203, and the other end is the rotating end 205. A clamping matching section is provided between the two ends of the matching rod 204, and the outer diameter of the clamping matching section is smaller than the diameter of the rotating end 205; a clamping ring 211 is provided between the matching rod 204 and the matching hole 207, and the clamping ring 211 is an elastic clamping ring 211. The outer diameter of the clamping ring 211 in its natural state is larger than the diameter of the inlet section 208, and the inner diameter of the clamping ring 211 is smaller than the outer diameter of the rotating end 205; the rotating end 205 enters the rotating section 210, and the clamping matching section is connected to the clamping section 209 through the clamping ring 211, and the clamping ring 211 restricts the matching rod 204 from leaving the matching hole 207.

[0051] In one embodiment of the present application, the extrusion portion 206 is provided with a first curved surface 215, see Figure 4 The fixed channel is provided with a second curved surface 306, see Figure 1 , that is, the first curved surface 215 is the bottom of the extrusion portion 206, the second curved surface 306 is the bottom of the fixing groove 302, and the second curved surface 306 is arranged opposite to the fixing screw hole 303, see Figure 1 The second curved surface 306 is arranged at the bottom of the fixing groove 302 and is arranged opposite to the fixing screw hole 303. When the threaded portion 202 is threadedly connected with the fixing screw hole 303, the extrusion portion 206 is close to the bottom of the fixing groove 302, and the first curved surface 215 is close to the second curved surface 306. Since the first curved surface 215 is parallel to the second curved surface 306, the first curved surface 215 and the second curved surface 306 can clamp the elastic band 502, so that the elastic band 502 is fixedly connected to the pedicle; due to the design of the first curved surface 215 and the second curved surface 306 matching each other, when the first curved surface 215 and the second curved surface 306 clamp the elastic band 502, the curvature of the first curved surface 215 and the second curved surface 306 can limit the deformation of the elastic band 502, thereby ensuring the clamping effect of the first curved surface 215 and the second curved surface 306 on the elastic band 502.

[0052] In one embodiment of the present application, the length of the first curved surface 215 is equal to the length of the second curved surface 306. Figure 6 (The numbers of the first curved surface 215 and the second curved surface 306 are not marked in the figure), the length of the first curved surface 215 of the extrusion portion 206 is the same as the length of the bottom of the fixing groove 302, so that when the first curved surface 215 and the second curved surface 306 are close to each other and the elastic band 502 is clamped, since the lengths of the first curved surface 215 and the second curved surface 306 are equal, the effective length of the first curved surface 215 and the second curved surface 306 for clamping the elastic band 502 is increased, thereby ensuring the clamping effect of the first curved surface 215 and the second curved surface 306.

[0053] Preferably, the first curved surface 215 and the second curved surface 306 are arc surfaces, which increase the contact area between the first curved surface 215 and the second curved surface 306 and the elastic band 502 , thereby ensuring the clamping effect of the first curved surface 215 and the second curved surface 306 on the elastic band 502 .

[0054] See also Figure 4 , Figure 5 In one embodiment of the present application, the second curved surface 306 is provided with a positioning groove 305, and the depth direction of the positioning groove 305 is the same as the axial direction of the fixing screw hole 303; the extrusion portion 206 is provided with a positioning protrusion 214, and when the first curved surface 215 approaches the second curved surface 306, the positioning protrusion 214 can be inserted into the positioning groove 305, and the fixing screw 201 is threadedly connected with the fixing screw hole 303. When moving along the axial direction of the fixing screw hole 303, the extrusion portion 206 approaches the positioning groove 305, and the positioning protrusion 214 presses the elastic band 502 that can undergo elastic deformation into the positioning groove 305, so that when the elastic band 502 passes through the first curved surface 215 and the second curved surface 306, it undergoes elastic deformation due to the action of the positioning protrusion 214 and the positioning groove 305, thereby strengthening the fixing effect of the extrusion portion 206 and the fixing channel on the elastic band 502.

[0055] See also Figure 7 Furthermore, along the depth direction of the positioning groove 305, the inner diameter of the positioning groove 305 gradually decreases; along the height direction of the positioning protrusion 214, the outer diameter of the positioning protrusion 214 gradually decreases; the positioning protrusion 214 can be inserted into the positioning groove 305. Through the changes in the inner diameter of the positioning groove 305 and the outer diameter of the positioning protrusion 214, the elastic band 502 can be more closely attached to the outer wall of the positioning protrusion 214 and the inner wall of the positioning groove 305, and the shape change is relatively gentle, so that the shape of the elastic band 502 is not drastically changed under the action of the positioning protrusion 214, so that the elastic band 502 is not damaged.

[0056] See also Figure 5 Furthermore, the positioning groove 305 is arranged at the central position of the second curved surface 306, so that when the positioning protrusion 214 and the positioning groove 305 clamp the elastic band 502, the area of ​​the second curved surface 306 outside the positioning groove 305 can clamp the elastic band 502, and the force exerted by the elastic band 502 on the nail seat 301 is more balanced.

[0057] See also Figure 4 , Figure 6 , Figure 8The fixing channel is a fixing groove 302 arranged on the surface of the nail seat 301, and the groove walls on both sides of the fixing groove 302 are provided with thread grooves 304, and threads are provided in the thread grooves 304, and the two thread grooves 304 form a fixing screw hole 303; the extrusion part 206 is provided with two first limiting parts 212 and two second limiting parts 213, and the two first limiting parts 212 can respectively fit a groove wall of the fixing groove 302, and the two second limiting parts 213 can respectively fit a groove wall of a thread groove 304, so as to limit the rotation of the extrusion part 206 in the first groove. When used in complex situations in the body, since the bending action of the human spine is various, the spine is given The magnitude and direction of the force applied by the elastic band 502 are relatively complex, so the force applied by the elastic band 502 to the extrusion portion 206 is relatively complex. In addition, 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 extrusion portion 206 in the body is required to be relatively high. The first limiting portion 212 and the second limiting portion 213 can limit the lateral movement of the extrusion portion 206 in the fixed groove 302, and the threaded portion 202 limits the extrusion portion 206 from being away from the bottom of the fixed groove 302, so that the extrusion portion 206 can stably cooperate with the bottom of the fixed groove 302 to clamp the elastic band 502.

[0058] In this application, the strap screw 201 and the rod screw 101 can be used at the same time. Fig.10 , multiple double-groove pedicle screws are provided along the extension direction of the spine, Fig. 9 The curvature of the spine (a in the figure) is small and is corrected using elastic band 502. Fig. 9 The degree of curvature is large, and a rigid rod 501 needs to be used for correction, so one of the double-groove pedicle screws is provided with a fixed band screw 201 and a fixed rod screw 101, see Fig.10 , so as to meet different usage needs.

[0059] 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.

[0060] 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-groove pedicle screw for fusion and non-fusion surgery, characterized in that: It includes a rod fixing screw, a belt fixing screw, a ball stud, and a nail seat connected to the ball stud; The nail seat is provided with two mutually parallel fixing channels in an array along one direction, the fixing channels penetrate the nail seat, the nail seat is also provided with a fixing screw hole communicating with the side wall of the fixing channel, the two fixing channels are respectively provided with the fixing screw holes, the fixing rod screw and the fixing belt screw can be threadedly connected with the fixing screw holes; The fixing screw includes an extrusion part and a threaded part plugged into the extrusion part, the side wall of the threaded part is provided with a thread threadedly connected to the fixing screw hole, the extrusion part can rotate relative to the extrusion part around the axis of the threaded part, and the threaded part rotates around its own axis. When the extrusion part is threadedly connected to the fixing screw hole, the extrusion part enters the fixing channel, and the inner wall of the fixing channel can limit the extrusion part from rotating with the threaded part.

2. A double-groove pedicle screw for fusion and non-fusion surgery according to claim 1, characterized in that: The extrusion portion is provided with a first curved surface, the fixing channel is provided with a second curved surface, the second curved surface is arranged opposite to the fixing screw hole, and when the threaded portion is threadedly connected with the fixing screw hole, the first curved surface is close to the second curved surface, and the first curved surface is parallel to the second curved surface.

3. A double-groove pedicle screw for fusion and non-fusion surgery according to claim 2, characterized in that: The length of the first curved surface is equal to the length of the second curved surface.

4. A double-groove pedicle screw for fusion and non-fusion surgery according to claim 2, characterized in that: The second curved surface is provided with a positioning groove, and the depth direction of the positioning groove is the same as the axial direction of the fixing screw hole; The extrusion portion is provided with a positioning protrusion, and when the first curved surface approaches the second curved surface, the positioning protrusion can be inserted into the positioning groove.

5. A double-groove pedicle screw for fusion and non-fusion surgery according to claim 4, characterized in that: Along the depth direction of the positioning groove, the inner diameter of the positioning groove gradually decreases; Along the height direction of the positioning protrusion, the outer diameter of the positioning protrusion gradually decreases; the positioning protrusion can be inserted into the positioning groove.

6. A double-groove pedicle screw for fusion and non-fusion surgery according to claim 4, characterized in that: The positioning groove is arranged at the center of the second curved surface.

7. A double-groove pedicle screw for fusion and non-fusion surgery according to claim 1, characterized in that: The extrusion portion is provided with a matching hole, The threaded portion is provided with a threaded rod that can be threadedly connected to the fixing screw hole and a matching rod that can be inserted into the matching hole, the matching rod can rotate in the matching hole, the threaded rod and the matching rod are coaxially arranged, the aperture of the matching hole is smaller than the outer diameter of the threaded rod, and the length of the matching rod is not greater than the depth of the matching hole.

8. A double-groove pedicle screw for fusion and non-fusion surgery according to claim 7, characterized in that: The matching rod is a round rod, and the matching hole is a round hole; One end of the matching rod is connected to the threaded rod, and the other end is a rotating end, and the diameter of the rotating end is equal to the hole diameter of the matching hole.

9. A double-groove pedicle screw for fusion and non-fusion surgery according to claim 8, characterized in that: The matching hole includes an inlet section, a clamping section, and a rotating section along its depth direction, and the inner diameter of the clamping section is larger than the inner diameters of the rotating section and the inner diameters of the inlet section; One end of the matching rod is connected to the threaded rod, and the other end is a rotating end. A snap-fit ​​section is provided between the two ends of the matching rod, and the outer diameter of the snap-fit ​​section is smaller than the diameter of the rotating end. A clamping ring is provided between the matching rod and the matching hole, the outer diameter of the clamping ring is larger than the diameter of the inlet section, and the inner diameter of the clamping ring is smaller than the outer diameter of the rotating end; The rotating end enters into the rotating section, and the snap-fit ​​section is connected to the snap-fit ​​section via a clamping ring, and the clamping ring restricts the fitting rod from leaving the fitting hole.

10. A double-groove pedicle screw for fusion and non-fusion surgery according to claim 1, characterized in that: The fixing channel is a fixing groove arranged on the surface of the nail seat, the groove walls on both sides of the fixing groove are provided with thread grooves, the thread grooves are provided with threads, and the two thread grooves form the fixing screw hole; The extrusion portion is provided with two first limiting portions and two second limiting portions, the two first limiting portions can respectively fit a groove wall of the fixing groove, and the two second limiting portions can respectively fit a groove wall of the thread groove.

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