CN217430137U - Internal fixing system and pedicle screw - Google Patents

Abstract

The utility model relates to an internal fixation system and pedicle screw, wherein the pedicle screw includes screw seat and screw body. The screw seat is provided with an axially through inner cavity, the inner cavity is provided with a rotating groove, and the rotating groove is provided with two first rotation stopping planes which are opposite along the radial direction; the screw body is including the screw thread post and the rotating head that are connected, the screw thread post is used for passing the inner chamber is followed the distal end of screw seat stretches out, the rotating head be used for with swivelling chute normal running fit, just the rotating head is equipped with two relative second along its self rotation axis direction and splines the plane, the second splines the plane with correspond first plane cooperation that splines is used for restricting the screw body winds the axial rotation of screw seat. The screw body of the fixing system and the pedicle screw can rotate directionally in the screw seat, so that the anti-rotation effect of the cone is improved, and the auxiliary directional operation is realized.

Description

Internal fixing system and pedicle screw

Technical Field

The utility model relates to the technical field of medical equipment, especially, relate to an internal fixation system and pedicle of vertebral arch screw.

Background

With the development of orthopedic medical technology, the application of orthopedic medical implants is more and more extensive. The spinal internal fixation device is widely applied to the surgical treatment of spinal degenerative diseases, spinal tumors, wounds, spinal infection and the like. The vertebral column internal fixation device mainly comprises a connecting rod and vertebral pedicle screws, the screw bodies of the vertebral pedicle screws are implanted into the vertebral column and fixed with the vertebral column, the screw seats of the vertebral pedicle screws are connected with the connecting rod, the distance and the angle between the vertebral pedicle screws are adjusted, and the connecting rod and the corresponding vertebral pedicle screws are locked again to achieve the purpose of treatment.

The pedicle screws commonly available on the market at present generally comprise a screw seat with a spherical inner cavity, a pressing block with a spherical groove and a screw body with a ball head. Through the ball head and the spherical inner cavity in rotating fit, the screw body can rotate 360 degrees in the screw seat.

In the spine deformity correction operation or the intervertebral degeneration fusion operation, a plurality of screws are needed to be utilized for positioning, spreading, pressurizing and other orthopedic operation operations, and because the screw body of the traditional pedicle screw can rotate 360 degrees in the screw seat, the anti-rotation effect of the vertebral body is poor when the spreading and pressurizing operations are carried out in certain spine operation processes, thereby increasing the difficulty of the operation of the doctor and further possibly leading the operation to fail to achieve the expected ideal effect.

SUMMERY OF THE UTILITY MODEL

Based on this, it is necessary to provide an internal fixation system and pedicle screw, and the screw body of pedicle screw can be directional rotated in the screw seat to improve the anti-soon effect of cone, realized supplementary directional operation, in order to satisfy clinical operation variety demand, provide convenience and possibility for the operation.

In one aspect, the present application provides a pedicle screw comprising:

the screw seat is provided with an axially through inner cavity, the inner cavity is provided with a rotating groove, and the rotating groove is provided with two first rotation stopping planes which are opposite along the radial direction;

the screw body, including the screw thread post and the rotating head that are connected, the screw thread post is used for passing the inner chamber is followed the distal end of screw seat stretches out, the rotating head be used for with swivelling chute normal running fit, just the rotating head is equipped with relative two second along its self rotation axis direction and splines the plane, the second splines the plane with correspond first plane cooperation that splines is used for the restriction the screw body winds the axial rotation of screw seat.

The technical solution of the present application is further described below:

in one embodiment, a cylindrical surface is arranged between the two first rotation stopping planes, and the axial direction of the cylindrical surface is perpendicular to the first rotation stopping planes.

In one embodiment, a cylindrical surface is arranged between the two second rotation stop planes, and the axial direction of the cylindrical surface is perpendicular to the second rotation stop planes.

In one embodiment, the far end of the inner cavity comprises a swinging groove, the groove wall of the swinging groove comprises two limiting inclined surfaces which are oppositely arranged in the swinging direction of the threaded column, and the distance between the two limiting inclined surfaces is gradually increased along the direction far away from the rotating groove.

In one embodiment, the groove wall of the swing groove further comprises two side walls, the two side walls are oppositely arranged, and both the two side walls are parallel to the first rotation stopping plane.

In one embodiment, the swing groove is a tapered groove, and the diameter of the tapered groove gradually increases in a direction away from the rotation groove.

In one embodiment, the inner cavity is further provided with a holding groove communicated with the rotating groove, and the pedicle screw further comprises a pressing ring movably arranged in the holding groove and in rotatable contact with the rotating head.

In one embodiment, a limiting groove is formed in the peripheral side of the pressing ring, and a locking hole is further formed in the position, corresponding to the accommodating groove, of the peripheral side of the screw seat.

In one embodiment, the screw base is further provided with a rod placing groove communicated with the accommodating groove and radially penetrating through the screw base, the rod placing groove is used for placing a connecting rod, the inner cavity is further provided with a thread groove communicated with the accommodating groove, the pedicle screw further comprises a pressing piece, the pressing piece is in threaded fit with the thread groove, and the pressing piece is used for abutting the connecting rod against the pressing ring.

In another aspect, the present application further provides an internal fixation system, which includes a connecting rod and at least two pedicle screws as described above, wherein the connecting rod connects at least two pedicle screws.

The pedicle screw is characterized in that two opposite first rotation stopping planes are arranged on the groove wall of the rotating groove, two opposite second rotation stopping planes are arranged on the rotating head of the screw body, and the first rotation stopping planes are contacted with the second rotation stopping planes, thereby limiting the axial rotation of the screw body around the screw seat, enabling the rotating head to only rotate around the direction vertical to the first rotation-stopping plane when rotating in the rotating groove, further, the thread column of the screw body can only swing in a plane parallel to the first rotation-stopping plane, so that the directional rotation of the screw body is realized, and when the vertebral pedicle screws are used for positioning, spreading, pressurizing and other orthopedic operations in the spine deformity correction operation or the intervertebral degeneration fusion operation, the screw body can rotate freely, so that the anti-rotation effect of the vertebral body in the operation is improved, and the difficulty of the operation of a doctor is reduced.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification.

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

FIG. 1 is a cross-sectional view of an embodiment pedicle screw;

FIG. 2 is a cross-sectional view of the pedicle screw shown in FIG. 1 in another cross-section;

FIG. 3 is an exploded view of the pedicle screw shown in FIG. 1;

FIG. 4 is an elevation view of the screw body of the pedicle screw shown in FIG. 1;

FIG. 5 is a top view of the screw body shown in FIG. 4;

FIG. 6 is a side view of the screw body shown in FIG. 4;

FIG. 7 is a top view of the screw receptacle of the pedicle screw shown in FIG. 1;

FIG. 8 is a cross-sectional view of the screw housing shown in FIG. 7, taken at section A-A;

FIG. 9 is a cross-sectional view of the screw housing shown in FIG. 7, taken at section B-B;

FIG. 10 is a top view of the compression ring of the pedicle screw shown in FIG. 1;

FIG. 11 is a cross-sectional view of the pressure ring shown in FIG. 10;

FIG. 12 is a cross-sectional view of another embodiment pedicle screw;

FIG. 13 is a cross-sectional view of the pedicle screw shown in FIG. 12 in another cross-section;

FIG. 14 is an exploded view of the pedicle screw shown in FIG. 12;

FIG. 15 is an elevation view of the screw body of the pedicle screw shown in FIG. 12;

FIG. 16 is a top view of the screw body shown in FIG. 15;

FIG. 17 is a side view of the screw body shown in FIG. 15;

FIG. 18 is a top view of the screw receptacle of the pedicle screw shown in FIG. 15;

FIG. 19 is a cross-sectional view of the screw housing shown in FIG. 18, taken at section C-C;

FIG. 20 is a cross-sectional view of the screw housing shown in FIG. 18, taken at section D-D;

FIG. 21 is an elevation view of the compression ring of the pedicle screw shown in FIG. 1;

FIG. 22 is a top view of the pressure ring shown in FIG. 21;

figure 23 is a cross-sectional view of the pressure ring shown in figure 21 taken at section E-E.

Description of reference numerals:

10. a screw seat; 11. a rotating tank; 111. a first rotation stop plane; 12. accommodating grooves; 13. a thread groove; 14. A bar placing groove; 15. a locking hole; 151. thin wall; 16. a swing groove; 161. a side wall; 162. a limiting inclined plane; 20. a screw body; 21. rotating the head; 211. a second rotation stop plane; 212. a cylindrical surface; 213. a spherical surface; 214. driving the blind hole; 215. a circular arc surface; 22. a threaded post; 30. pressing a ring; 31. a limiting groove; 32. a spherical groove; 33. positioning a groove; 34. avoiding the arc surface; 35. a limiting plane; 40. a compression member; 50. and (4) connecting the rods.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention more comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, as those skilled in the art will be able to make similar modifications without departing from the spirit and scope of the present invention.

Specifically, referring to fig. 1 to 3, fig. 1 to 3 show a schematic structural diagram of a pedicle screw according to an embodiment of the invention. Specifically, the pedicle screw of an embodiment comprises a screw seat 10, a screw body 20, a pressing ring 30 and a pressing piece 40, wherein the screw body 20 is implanted into the spinal column, the screw seat 10 is used for placing a connecting rod 50, the pressing ring 30 is used for pressing the screw body 20 into the screw seat 10, and the pressing piece 40 is used for locking the connecting rod 50 into the screw seat 10.

Specifically, as shown in FIGS. 1-3, the screw base 10 is generally cylindrical and has an axially extending lumen therethrough, which includes a proximal opening and a distal opening in axial sequence, with the proximal end at the top and the distal end at the bottom in FIG. 1. A neck part which contracts in the radial direction is arranged between the opening and the through hole. The radial inner dimension of the neck is small, so that a screw is placed in the opening, and the head of the screw can be clamped on the neck, so that the connection between the screw seat and the screw is realized. The neck is for example a ring of bosses protruding radially inwards. The opening is provided with a rotation slot 11 near the neck, i.e. the proximal end of the neck, the rotation slot 11 is provided with two first rotation stop planes 111 opposite along the radial direction of the screw seat 10, and the two first rotation stop planes 111 are parallel and perpendicular to the radial direction of the screw seat 10. An arc surface is arranged between the two first rotation stopping planes 111, and the axial direction of the arc surface (i.e. the axial direction of the rotating groove 11) is perpendicular to the first rotation stopping planes 111. The cambered surface is preferably a cylindrical surface.

The screw body 20 includes a threaded post 22 and a rotating head 21 connected, the threaded post 22 passes through the neck and the through hole and extends from the distal end of the screw base 10, the rotating head 21 is rotatably fitted to the rotary groove 11, and the rotating head 21 is shaped to match the rotary groove 11 and can rotate in the rotary groove 11 around the axial direction of the rotary groove 11. Specifically, the rotary head 21 is provided with two opposite second rotation stop planes 211 along the direction of its own rotation axis, and the two second rotation stop planes 211 are parallel and are both perpendicular to the direction of its own rotation axis. An arc surface is arranged between the two second rotation stopping planes 211, and the axial direction of the arc surface is perpendicular to the two second rotation stopping planes 211. The cambered surface is preferably a cylindrical surface.

The pedicle screw is formed by arranging two first rotation-stopping planes 111 on the wall of the rotary groove 11, and two second rotation-stopping planes 211 are disposed on the rotary head 21 of the screw body 20, and the first rotation-stopping plane 111 and the second rotation-stopping plane 211 are matched to ensure that the rotary head 21 can only rotate around a direction perpendicular to the first rotation-stopping plane 111 when rotating in the rotary slot 11, thereby enabling the threaded shank 22 of the screw body 20 to swing only in a plane parallel to the first rotation stop plane 111, but not to rotate about the axial direction of the screw seat, thereby realizing the directional rotation of the screw body 20, avoiding the problems that when the vertebral pedicle screws are used for positioning, expanding, pressurizing and other orthopedic operations in the spine deformity correction operation or the intervertebral degeneration fusion operation, the screw body 20 can rotate freely, so that the anti-rotation effect of the vertebral body in the operation is improved, and the difficulty of the operation of a doctor is reduced.

Further, referring to fig. 1 to 3 in combination with fig. 4 to 6, the rotary head 21 includes a cylindrical surface 212, the cylindrical surface 212 is rotatably fitted with the rotary slot 11, and the cylindrical surface 212 is in surface contact or line contact with the rotary slot 11, that is, in the present embodiment, the rotary slot 11 is a cylindrical slot matched with the cylindrical surface 212, two opposite slot walls in the cylindrical slot are each formed with a first rotation stop plane 111, and the two first rotation stop planes 111 are parallel. Another cylindrical surface matched with the cylindrical surface 212 is arranged between the two first rotation stopping planes 11, the axial direction of the cylindrical surface is perpendicular to the first rotation stopping planes 11, further, the cylindrical surface 212 of the rotating head 21 is connected between the second rotation stopping planes 211 at two sides, the two second rotation stopping planes 211 are parallel, the two second rotation stopping planes 211 are in one-to-one corresponding contact with the two first rotation stopping planes 111, so that the rotating head 21 can only rotate around the axis of the cylindrical surface 212 through the matching of the cylindrical surface 212 and the cylindrical surface groove, and the two second rotation stopping planes 211 are in one-to-one corresponding contact with the two first rotation stopping planes 111, thereby realizing the directional rotation of the screw body 20.

Preferably, in the present embodiment, the central angle corresponding to the circular arc formed by the cross section of the cylindrical surface 212 is 180 °, and it should be noted that, in other embodiments, the central angle corresponding to the circular arc formed by the cross section of the cylindrical surface 212 may be less than 180 ° or greater than 180 °. Further, the threads of the threaded post 22 may be full or half threads or a combination of single and multi-lead threads. Further, the threaded post 22 may be in the form of a cylindrical or conical or cylindrical tailed cone. Further, the end of the rotating head 21 away from the threaded column 22 is provided with a blind driving hole 214, and the blind driving hole 214 is used for cooperating with a wrench to realize the implantation of the screw body 20 into the spinal column. Preferably, the blind drive hole 214 may be a hexagonal hole, a hexagonal plum blossom, a rectangular hole, or the like.

Referring to fig. 7 to 9, preferably, the through hole at the distal end of the screw holder 10, i.e., the distal end of the inner cavity, includes a swing groove 16, and the groove wall of the swing groove 16 includes two limit slopes 162, the two limit slopes 162 being disposed opposite to each other in the swing direction of the threaded post 22, and the distance between the two limit slopes 162 gradually increases in the direction away from the rotary groove 11. The two limit inclined planes 162 are used for limiting the swing range of the threaded column 22, so that the distance between the two limit inclined planes 162 can be designed according to the requirement of the swing angle of the threaded body, and further, the swing range of the threaded column 22 can be changed. Further, when the threaded post 22 swings to the limit position, it may be in line contact or point contact with the limit slope 162.

Further, the groove wall of the swing groove 16 further includes two side walls 161, the two side walls 161 are disposed oppositely, and both the two side walls 161 are parallel to the swing direction of the threaded column 22, i.e., parallel to the first rotation stop plane 111. The swinging direction of the threaded column 22 is further limited by the two side walls 161, and the directional swinging direction of the threaded column 22 is ensured. Preferably, the sidewall 161 can contact the threaded post 22 or can be a clearance fit with the threaded post 22.

Further, referring to fig. 1, the screw seat 10 is further provided with a receiving groove 12 communicated with the rotating groove 11, and the pedicle screw further comprises a pressing ring 30, wherein the pressing ring 30 is movably disposed in the receiving groove 12 and is in rotatable contact with the rotating head 21. Specifically, the pressing ring 30 is used to cooperate with the pressing member 40 to press the screw body 20 in the screw housing 10. Preferably, referring to fig. 4, in the present embodiment, the rotating head 21 is further provided with a spherical surface 213. Referring to fig. 11, one end of the pressing ring 30 close to the rotator head 21 is provided with a spherical groove 32, so that the pressing ring 30 and the rotator head 21 form spherical contact through the spherical groove 32 and the spherical surface 213, and the rotator head 21 can rotate relative to the pressing ring 30 before the pressing member 40 locks the pressing ring 30, thereby adjusting the angle of the screw body 20. Further, one end of the pressure ring 30 close to the rotating head 21 is provided with an avoiding arc surface 34 for avoiding the cylindrical surface 212, so that the interference between the cylindrical surface 212 and the pressure ring 30 when the screw body 20 swings is avoided.

Referring to fig. 2, the compression ring 30 is provided with a limiting groove 31 on the peripheral side, and the screw seat 10 is further provided with a locking hole 15 on the peripheral side corresponding to the position of the receiving groove 12. Further, the locking hole 15 is a blind hole, i.e. a thin wall 151 is provided between the locking hole 15 and the limiting groove 31. The thin wall 151 can be extruded and deformed by penetrating a tool into the locking hole 15, so that the thin wall 151 protrudes into the limiting groove 31, the pressing ring 30 and the deformed thin wall 151 form a riveting structure, the pressing ring 30 is prevented from falling off from the screw base 10, the pressing ring 30 can still move in a limited axial direction at the moment, the screw body 20 can rotate relative to the pressing ring 30, and then the angle of the screw body 20 can be adjusted. Preferably, two limiting grooves 31 are formed in the peripheral side of the pressing ring 30, correspondingly, two locking holes 15 are formed in the peripheral side of the screw seat 10, and the two locking holes 15 correspond to the two limiting grooves 31 one by one, so that the riveting effect of the deformed thin wall 151 and the pressing ring 30 is improved.

Further, referring to fig. 3, the screw base 10 is further provided with a rod placing groove 14 communicating with the receiving groove 12 and penetrating through the screw base 10, the rod placing groove 14 is used for placing the connecting rod 50, and the screw base 10 is further provided with a thread groove 13 communicating with the receiving groove 12. Further, the pedicle screw further comprises a pressing piece 40, the pressing piece 40 is in threaded fit with the thread groove 13, and the pressing piece 40 is used for abutting against one side, far away from the pressing ring 30, of the connecting rod 50. After the connecting rod 50 is placed in the rod placing groove 14, the pressing piece 40 is locked in the thread groove 13, so that the pressing ring 30 is pressed while the connecting rod 50 is fixed in the rod placing groove 14, and the pressing ring 30 fixes the swing angle of the screw body 20. Preferably, the rod placing groove 14 is a U-shaped groove, that is, the rod placing groove 14 penetrates through the upper end surface of the screw seat 10, so that the connecting rod 50 can be conveniently placed into the rod placing groove 14 from top to bottom, and the installation is convenient. Further, the axial direction of the first rotation-stopping plane 111 and the connecting rod 50 may be perpendicular or parallel or form another included angle, so that the axial angle relationship between the first rotation-stopping plane 111 and the connecting rod 50 can be designed as required, and a desired swing direction of the screw body 20 is obtained.

Further, referring to fig. 10 to 11, one end of the pressing ring 30 near the connecting rod 50 is provided with a positioning groove 33 for engaging with the peripheral side contour shape of the connecting rod 50. For example, in this embodiment, the positioning groove 33 is a cylindrical groove, so that the pressing ring 30 can fit the contour of the periphery of the connecting rod 50, and then the connecting rod 50 is pressed from both sides of the connecting rod 50 by matching with the pressing member 40, thereby improving the connection stability between the connecting rod 50 and the pedicle screw.

The installation steps of the pedicle screw are as follows: the screw body 20 is first installed into the screw holder 10 from the upper part of the screw holder 10, the screw post 22 is made to pass through the swing groove 16 at the bottom of the screw holder 10, the cylindrical surface 212 of the rotary head 21 and the rotation groove 11 of the screw holder 10 form a revolute pair, and the second rotation stop plane 211 of the rotary head 21 is in contact with or infinitely close to the first rotation stop plane 111 of the screw holder 10, thereby restricting the rotation direction of the rotary head 21. The compression ring 30 is then fitted into the receiving groove 12 of the screw receptacle 10 such that the spherical groove 32 of the compression ring 30 cooperates with the spherical surface 213 of the screw body 20 to form a ball revolute pair. Simultaneously, the limiting groove 31 of the pressing ring 30 is aligned with the locking hole 15 of the screw base 10, and then the pressing ring 30 is limited to be separated from the screw base 10 by pressing and riveting the thin wall 151 at the bottom of the locking hole 15 into the limiting groove 31. Further, after the pressing ring 30 is riveted with the screw seat 10 and before the connecting rod 50 is installed, the pressing ring 30 can move axially along the screw seat 10, so that the screw body 20 can swing to adjust the angle. At this time, the wrench can be engaged with the blind driving hole 214 to perform positioning, expanding, pressurizing and other operations, and then the swing angle of the screw body 20 is adjusted. Then, the connecting rod 50 is fitted into the rod setting groove 14 of the screw holder 10, and the outer peripheral side of the connecting rod 50 is brought into close contact with the positioning groove 33 of the pressing ring 30. Finally, the pressing piece 40 is arranged in the threaded groove 13, the pressing piece 40 is screwed through an instrument, so that the pressing piece 40 presses the connecting rod 50 and the pressing ring 30, the connecting rod 50 and the screw body 20 are fixed, and the pedicle screw installation is completed.

Referring to fig. 12 to 23, fig. 12 to 23 are schematic views illustrating another exemplary pedicle screw structure, which is different from the pedicle screw embodiment of fig. 1 in that the rotation head 21 of the screw seat 10 in the pedicle screw of fig. 12 includes an arc surface 215, and the two second rotation stop planes 211 are parallel to each other between the second rotation stop planes 211 of the arc surface 215 connected to both sides. The arc surface 215 is rotationally matched with the rotation groove, that is, in the present embodiment, the rotation groove 11 is an arc groove matched with the arc surface 215, two opposite groove walls in the arc groove are both formed with the first rotation stopping plane 111, and the two first rotation stopping planes 111 are parallel. Two second splines plane 211 and parallels to two second splines plane 211 and two first splines plane 111 one-to-one contact, thereby form the revolute pair through arc surface 215 and the cooperation of circular arc groove, and two second splines plane 211 and two first splines plane 111 one-to-one contact of rethread, can guarantee the directional swing of screw body 20.

Further, referring to fig. 19, the swing groove 16 of the screw groove of the embodiment shown in fig. 19 is a tapered groove, and the diameter of the tapered groove is gradually increased in a direction away from the rotation groove 11. The groove wall of the tapered groove serves to limit the swing range of the threaded post 22. Understandably, the larger the maximum diameter of the tapered groove, the larger the swing range of the threaded post 22. Therefore, the maximum diameter of the tapered groove can be selected according to the requirement of the swing angle of the thread body, and the swing range of the thread column 22 can be changed. Further, when the threaded post 22 swings to the extreme position, it may make line contact or point contact with the groove wall of the tapered groove.

Further, referring to fig. 21 to 23, the compression ring 30 of the embodiment shown in fig. 21 to 23 has the same basic structure as the compression ring 30 shown in fig. 10, but in order to fit the two first rotation stop planes 111 in the spherical grooves, two limit planes 35 are further provided on the peripheral side of the compression ring 30 of the embodiment shown in fig. 21 to 23, and the two limit planes 35 are in one-to-one contact with the two first rotation stop planes 111, so that the compression ring 30 is prevented from interfering with the first rotation stop planes 111 and the relative rotation between the compression ring 30 and the screw seat 10 is also limited, thereby preventing the compression ring 30 from rotating in a human body due to a biomechanical action, and further preventing the compression ring 30 from being worn or loosened.

The installation steps of the pedicle screw are as follows: the screw body 20 is first installed into the screw base 10 from the upper part of the locking base, the screw post 22 is made to pass through the screw post 22 from the swing groove 16 at the bottom of the locking base, the circular arc surface 215 of the rotary head 21 and the spherical groove of the screw base 10 form a revolute pair, and the second rotation stop plane 211 of the rotary head 21 is in contact with or infinitely close to the first rotation stop plane 111 of the screw base 10, thereby limiting the rotation direction of the rotary head 21. The compression ring 30 is then fitted into the receiving groove 12 of the screw receptacle 10 such that the spherical groove 32 of the compression ring 30 cooperates with the circular arc surface 215 of the screw body 20 to form a ball revolute pair. Simultaneously, the limiting groove 31 of the pressing ring 30 is aligned with the locking hole 15 of the screw base 10, and then the pressing ring 30 is limited to be separated from the screw base 10 by pressing and riveting the thin wall 151 at the bottom of the locking hole 15 into the limiting groove 31. Further, after the pressing ring 30 is riveted with the screw seat 10 and before the connecting rod 50 is installed, the pressing ring 30 can move axially along the screw seat 10, so that the screw body 20 can swing to adjust the angle. At this time, the wrench can be engaged with the blind driving hole 214 to perform positioning, expanding, pressurizing and other operations, and then the swing angle of the screw body 20 is adjusted. Then, the connecting rod 50 is fitted into the rod setting groove 14 of the screw holder 10, and the outer peripheral side of the connecting rod 50 is brought into close contact with the positioning groove 33 of the pressing ring 30. Finally, the pressing piece 40 is arranged in the threaded groove 13, the pressing piece 40 is screwed through an instrument, so that the pressing piece 40 presses the connecting rod 50 and the pressing ring 30, the connecting rod 50 and the screw body 20 are fixed, and the pedicle screw installation is completed.

Further, the application also provides an internal fixing system in another aspect. The internal fixation system of one embodiment includes a connecting rod 50 and at least two pedicle screws of any of the above embodiments, wherein the connecting rod 50 connects at least two pedicle screws. During the use, implant the screw body 20 of pedicle of vertebral arch screw in the backbone, connect the screw seat 10 of pedicle of vertebral arch screw with connective bar 50 again, adjust pedicle of vertebral arch screw angle simultaneously, lock connecting rod and the pedicle of vertebral arch screw that corresponds again, can reach the treatment purpose of correcting that resets to the backbone.

The pedicle screw of the internal fixation system is provided with the first rotation stopping plane 111 on the groove wall of the rotary groove 11, the second rotation stopping plane 211 is arranged on the rotary head 21 of the screw body 20, and the first rotation stopping plane 111 is in contact with the second rotation stopping plane 211, so that the rotary head 21 can only rotate around the direction vertical to the first rotation stopping plane 111 when rotating in the rotary groove 11, and further the threaded column 22 of the screw body 20 can only swing in the plane parallel to the first rotation stopping plane 111, and further the directional rotation of the screw body 20 is realized, and the problem that the screw body 20 rotates randomly when the pedicle screw is used for orthopedic operations such as positioning, spreading and pressurizing is avoided in a spine deformity correction operation or a degenerative fusion operation, and the anti-rotation effect of a vertebral body in the operation is improved, so that the difficulty of the operation of a doctor is reduced.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only represent several embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the invention. It should be noted that, for those skilled in the art, without departing from the concept of the present invention, several variations and modifications can be made, which all fall within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like, indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or to implicitly indicate the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In the present application, unless expressly stated or limited otherwise, the first feature may be directly on or directly under the second feature or indirectly via intermediate members. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.

Claims (10)

1. A pedicle screw, comprising:

the screw seat is provided with an axially through inner cavity, the inner cavity is provided with a rotating groove, and the rotating groove is provided with two first rotation stopping planes which are opposite along the radial direction;

the screw body, including the screw thread post and the rotating head that are connected, the screw thread post is used for passing the inner chamber is followed the distal end of screw seat stretches out, the rotating head be used for with swivelling chute normal running fit, just the rotating head is equipped with relative two second along its self rotation axis direction and splines the plane, the second splines the plane with correspond first plane cooperation that splines is used for the restriction the screw body winds the axial rotation of screw seat.

2. The pedicle screw according to claim 1, wherein a cylindrical surface is arranged between the two first rotation stop planes, and the axial direction of the cylindrical surface is perpendicular to the first rotation stop planes.

3. The pedicle screw according to claim 1, wherein a cylindrical surface is arranged between the two second rotation stop planes, and the axial direction of the cylindrical surface is perpendicular to the second rotation stop planes.

4. The pedicle screw as claimed in claim 1, wherein the distal end of the inner cavity comprises a swing groove, the wall of the swing groove comprises two limit slopes, the two limit slopes are oppositely arranged in the swing direction of the threaded post, and the distance between the two limit slopes is gradually increased in the direction away from the rotation groove.

5. The pedicle screw as claimed in claim 4, wherein the groove wall of the wobble groove further comprises two side walls, the two side walls being disposed opposite each other and both of the side walls being parallel to the first rotation stop plane.

6. Pedicle screw according to claim 4, wherein the rocking groove is a conical groove with a diameter increasing in a direction away from the rotation groove.

7. The pedicle screw according to claim 1, wherein the inner cavity further comprises a receiving groove communicating with the rotating groove, and the pedicle screw further comprises a pressing ring movably disposed in the receiving groove and rotatably contacting the rotating head.

8. The pedicle screw according to claim 7, wherein the compression ring is provided with a limiting groove on the periphery, and the screw seat is further provided with a locking hole on the periphery corresponding to the accommodating groove.

9. The pedicle screw according to claim 7, wherein the screw base is further provided with a rod placing groove communicated with the accommodating groove and radially penetrating through the screw base, the rod placing groove is used for placing a connecting rod, the inner cavity is further provided with a thread groove communicated with the accommodating groove, the pedicle screw further comprises a pressing piece, the pressing piece is in threaded fit with the thread groove, and the pressing piece is used for enabling the connecting rod to abut against the pressing ring.

10. An internal fixation system comprising at least two pedicle screws as claimed in any one of claims 1-9 and a connecting rod connecting at least two of said pedicle screws.

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