Universal pedicle screw fixing system

Abstract

The invention discloses a universal pedicle screw fixing system, and relates to the technical field of medical instruments. Wherein one end of the connecting screw along the axial direction is a ball head part; the first screw hole, the first screw hole and the second screw hole are sequentially communicated in the axial direction of the screw base and penetrate through the two opposite end faces of the screw base in the axial direction, the first screw hole is provided with a first inner circumferential spherical surface connected with the ball head part in a matched mode, and the U-shaped opening extends to the first screw hole from the second screw hole in the axial direction of the screw base. The two U-shaped openings are located in the two opposite sides of the screw base in the radial direction respectively. The locking plug screw is connected with the first screw hole and abuts against the ball head part. An abutting plane and a U-shaped groove are respectively arranged on two opposite end surfaces of the U-shaped pressure seat along the axial direction; one end of the connecting rod penetrates through the U-shaped opening and the U-shaped groove and abuts against the screw base and the pressing base, and the pressing base abuts against the locking screw plug. The self-breaking screw plug is connected with the second screw hole and abuts against the abutting plane. The connecting effect of the connecting screw and the connecting rod on the screw seat can be enhanced, and the operation difficulty is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of medical devices, and in particular to a universal pedicle screw fixing system. Background Art

[0002] At present, the posterior vertebral screw-rod system plays a significant role in the treatment of spinal and cervical spine-related diseases, and promotes faster recovery of patients. The connecting screws used in the posterior vertebral screw-rod system are generally universal screws, which can solve the problem of difficulty in inserting the rod due to the single screw placement angle. After the connecting screw is inserted into the screw seat with a U-shaped opening and inserted into the patient's pedicle or lamina, the connecting screw and the screw seat are locked with a locking screw plug to prevent the connecting screw from rotating relative to the screw seat; then, the connecting rod is placed on the screw seat, and the connecting rod and the screw seat are fixed with a self-breaking screw plug, and the self-breaking screw plug is tightened until it breaks to achieve the expected locking effect, so as to avoid the locking force being too small or too large, which will cause the fixing effect of the connecting rod to deteriorate or even fail.

[0003] During use of the existing posterior vertebral screw-rod system, the locking screw plug and the self-breaking screw plug are both threadedly connected to the screw seat. The length of the locking screw plug is smaller than that of the self-breaking screw plug. Therefore, the connecting screw is prone to loosening due to the poor connection between the locking screw plug and the screw seat.

[0004] Moreover, the self-breaking screw plug will press against the connecting rod, and the contact area between the self-breaking screw plug and the connecting rod is small, and the friction effect is weak. Moreover, the self-breaking or separation of the self-breaking screw plug is mainly achieved by the friction resistance between the self-breaking screw plug and the screw seat and the axial blocking effect of the connecting rod on the self-breaking screw plug. In the case that the friction resistance between the self-breaking screw plug and the screw seat and the wall thickness of the self-breaking position of the self-breaking screw plug cannot be further optimized, the axial blocking effect of the connecting rod on the self-breaking screw plug can only be increased, making the self-breaking screw plug easy to break under the action of shear force. However, this will cause the operator to increase the twisting force of the self-breaking screw plug, increasing the difficulty of operation. At the same time, the self-breaking screw plug will easily rotate and loosen due to the large axial blocking effect applied by the connecting rod, which will lead to a decrease in the fixing effect of the connecting rod.

[0005] It can be seen that the structure of the existing posterior vertebral screw-rod system needs to be further improved. Summary of the invention

[0006] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention proposes a universal pedicle screw fixation system, which can enhance the connection effect of the connecting screw and the connecting rod on the screw seat, ensure the stable operation of the universal pedicle screw fixation system, and reduce the difficulty of operation.

[0007] The embodiment of the present invention provides a universal pedicle screw fixation system, including a connecting rod and a fixing assembly, wherein the fixing assembly is provided with two and is respectively located on opposite sides of the connecting rod along its own axial direction; the fixing assembly includes: A connecting screw, which is used to connect the vertebral body, wherein one end of the connecting screw along its own axial direction is a ball head; A screw seat, which is provided with a first screw hole, a first screw hole, a second screw hole and a U-shaped opening, wherein the first screw hole, the first screw hole and the second screw hole are sequentially connected along the axial direction of the screw seat and penetrate the two opposite end surfaces of the screw seat along its own axial direction, the first screw hole has a first inner circumferential spherical surface adapted to be connected with the ball head, the U-shaped opening extends from the second screw hole to the first screw hole along the axial direction of the screw seat, and the U-shaped opening is provided with two and is respectively located on opposite sides of the screw seat along its radial direction; A locking screw plug connected to the first screw hole and pressed against the ball head; The pressure seat is in a U-shaped structure, wherein one end face of the pressure seat along its own axial direction away from the locking screw plug is an abutting plane, and one end face close to the locking screw plug is recessed to form a U-shaped groove, and the U-shaped groove passes through the radial direction of the pressure seat; one end of the connecting rod is respectively provided in the two U-shaped openings and the U-shaped groove along the radial direction of the screw seat, and is respectively pressed against the screw seat and the pressure seat, and at the same time, one end of the pressure seat close to the locking screw plug is pressed against the locking screw plug; A self-breaking screw plug is connected to the second screw hole and pressed against the abutting plane.

[0008] The universal pedicle screw fixation system according to the embodiment of the present invention has at least the following beneficial effects: after the connecting screw is passed through the first screw hole of the screw seat and connected to the patient's vertebral position, the locking screw plug is screwed into the first screw hole of the screw seat, so that the locking screw plug can tighten the connecting screw, so that the connecting screw is fixed relative to the screw seat while maintaining a certain installation angle; then, the connecting rod is placed at the U-shaped opening of the screw seat, and then the pressure seat is placed in the screw seat, so that the connecting rod passes through the U-shaped groove of the pressure seat, and at the same time, the pressure seat can abut against the locking screw plug; then, the self-breaking screw plug is screwed into the second screw hole of the screw seat, so that the self-breaking screw plug can abut on the abutment plane of the pressure seat.

[0009] The U-shaped groove of the pressure seat cooperates with the U-shaped opening of the screw seat to fix the connecting rod tightly. At the same time, the contact area between the self-breaking screw plug and the abutting plane is large and the friction effect is strong. When the self-breaking screw plug breaks and separates by itself, the self-breaking screw plug will be simultaneously subjected to the friction resistance of the screw seat, the axial blocking effect of the connecting rod on the self-breaking screw plug through the pressure seat, and the friction effect between the abutting plane and the self-breaking screw plug. This can effectively reduce the twisting effect of the operator on the self-breaking screw plug to reduce the difficulty of operation. In addition, the friction effect between the self-breaking screw plug and the abutting plane can effectively prevent the self-breaking screw plug from easily rotating and loosening due to the axial blocking effect applied by the connecting rod, thereby strengthening the fixing effect of the connecting rod.

[0010] In some embodiments of the present invention, an abutment portion is provided at one end of the pressure seat close to the locking screw plug, and two abutment portions are provided and are respectively located on opposite sides of the U-shaped groove. One end of the abutment portion is integrally formed with the pressure seat, and the other end of the abutment portion is bent and extended toward the pressure seat in a direction radially away from the U-shaped groove.

[0011] In some embodiments of the present invention, the abutting portion is connected to the pressure seat in an arc transition, and the center angle of the abutting portion is greater than or equal to 45° and less than or equal to 90°.

[0012] In some embodiments of the present invention, the wall thickness of the abutting portion decreases from a side close to the U-shaped groove to a side away from the U-shaped groove.

[0013] In some embodiments of the present invention, the abutting plane is a frosted surface; and / or, The surface of the self-breaking screw plug in contact with the abutment plane is a frosted surface; and / or, The locking screw plug is coaxially provided with a second screw hole and a second inner angle hole, and the second screw hole has a second inner circumferential spherical surface that is adaptively connected to the ball head.

[0014] In some embodiments of the present invention, the self-breaking screw plug includes a screwing portion and a first threaded portion that are integrally formed with each other and coaxially arranged, and the outer peripheral surface of the connection between the screwing portion and the first threaded portion is provided with a first self-breaking groove, the first self-breaking groove is circular and is coaxially arranged with the first threaded portion, and the cross-sectional shape of the first self-breaking groove is V-shaped.

[0015] In some embodiments of the present invention, the first threaded portion is coaxially provided with a first inner angle hole, the screwing portion is coaxially provided with a first through hole, the aperture of the first through hole is larger than the aperture of the first inner angle hole, and the first through hole is connected to the first inner angle hole.

[0016] In some embodiments of the present invention, a second self-breaking groove is provided on the inner circumference of the connection between the twisting portion and the first threaded portion. The second self-breaking groove is annular and is coaxially arranged with the first threaded portion. The cross-sectional shape of the second self-breaking groove is V-shaped.

[0017] In some embodiments of the present invention, a third threaded portion is provided on the outer circumferential surface of the screw seat, and the self-breaking screw plug also includes an inner cylinder portion and an outer cylinder portion, the inner cylinder portion, the outer cylinder portion and the first threaded portion are coaxially arranged, one end of the inner cylinder portion is integrally formed with the first threaded portion, and the other end of the inner cylinder portion is integrally formed with the outer cylinder portion, the inner cylinder portion is located at the periphery of the twisting portion, and there is a spacing between the inner cylinder portion and the twisting portion, and a fourth threaded portion is provided on the inner circumferential surface of the outer cylinder portion, the outer cylinder portion is located at the periphery of the screw seat, and the fourth threaded portion is connected to the third threaded portion.

[0018] In some embodiments of the present invention, guide portions corresponding to the U-shaped opening are provided on opposite sides of the pressure seat, and the guide portions are located on one side of the U-shaped groove close to the abutment plane. The guide portions can slide along the side wall surface of the U-shaped opening, and the guide portions protrude from the U-shaped opening. The guide portions have an arc surface that can be adaptably connected to the outer peripheral surface of the connecting rod, and the outer cylinder portion can be pressed against the guide portions.

[0019] Other features and advantages of the present invention will be described in the following description, and partly become apparent from the description, or understood by practicing the present invention. The purpose and other advantages of the present invention can be realized and obtained by the structures particularly pointed out in the description, claims and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a structural exploded diagram of a universal pedicle screw fixation system provided according to an embodiment of the present invention; Figure 2 is a schematic diagram of the three-dimensional structure of a locking screw plug provided according to an embodiment of the present invention; Figure 3 is a cross-sectional schematic diagram of a locking screw plug provided according to an embodiment of the present invention; Figure 4 is a schematic diagram of the three-dimensional structure of a screw seat provided according to an embodiment of the present invention; Figure 5 is a schematic cross-sectional view of a screw seat provided according to an embodiment of the present invention; Figure 6 is a schematic diagram of the three-dimensional structure of a self-breaking screw plug provided in an embodiment of the present invention; Figure 7 is a cross-sectional schematic diagram of a self-breaking screw plug provided in an embodiment of the present invention; Figure 8 is a structural exploded diagram of a universal pedicle screw fixation system provided according to another embodiment of the present invention; Fig. 9 is a structural exploded diagram of a universal pedicle screw fixation system provided according to another embodiment of the present invention; Fig.10 It is a perspective structural schematic diagram of a self-breaking screw plug provided according to another embodiment of the present invention.

[0021] : Illustrations: 100, connecting screw; 110, ball head; 120, second threaded portion; 200, locking screw plug; 210, second screw hole; 220, second inner angle hole; 300, screw seat; 310, first screw hole; 320, first screw hole; 330, second screw hole; 340, U-shaped opening; 350, third threaded portion; 400, connecting rod; 500, pressure seat; 510, abutment plane; 520, U-shaped groove; 530, abutment portion; 540, guide portion; 600, self-breaking screw plug; 610, twisting portion; 611, first through hole; 620, first threaded portion; 621, first inner angle hole; 631, first self-breaking groove; 632, second self-breaking groove; 640, inner cylinder portion; 650, outer cylinder portion; 651, fourth threaded portion. DETAILED DESCRIPTION

[0022] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0023] In the description of the present invention, it is to be understood that a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0024] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0025] Reference below Figures 1 to 10 A universal pedicle screw fixation system according to an embodiment of the present invention is described.

[0026] like Figures 1 to 10 As shown, the universal pedicle screw fixation system according to the embodiment of the present invention can be applied to surgical operations for patients' spinal or cervical spine-related diseases, such as posterior spinal fixation, to enable patients to heal and recover faster after surgery.

[0027] Compared with the prior art, the universal pedicle screw fixation system of this embodiment can enhance the connection effect of the connecting screw 100 and the connecting rod 400 on the screw seat 300, avoid the phenomenon that the connecting screw 100 and the connecting rod 400 are easily loosened on the screw seat 300, thereby effectively ensuring the stable operation of the universal pedicle screw fixation system and reducing the difficulty of operation.

[0028] like Figures 1 to 7 As shown, the universal pedicle screw fixation system of this embodiment includes a connecting rod 400 and a fixing assembly. Among them, the number of connecting rods 400 is one, and at the same time, two fixing assemblies are provided, and the two fixing assemblies are respectively located on opposite sides of the connecting rod 400 along its own axis. It can be understood that the fixing assembly is installed on the patient's vertebral body (spine or cervical vertebra, etc.), and the function of the fixing assembly is to connect and fix the connecting rod 400. The connecting rod 400 is usually made of titanium alloy or stainless steel. The connecting rod 400 is a round rod. The connecting rod 400 can play a role in sharing the load of the spine, effectively promote the patient's bone healing, and reduce the risk of failure of spinal internal fixation surgery.

[0029] The structure of each fixing assembly includes a connecting screw 100 , a screw seat 300 , a locking screw plug 200 , a pressure seat 500 and a self-breaking screw plug 600 .

[0030] The connecting screw 100 is used to connect the vertebral body of the patient. Specifically, one end of the connecting screw 100 along its own axial direction is a ball head 110, and the other end is a second threaded portion 120. The ball head 110 and the second threaded portion 120 are integrally formed. The ball head 110 is provided with a hexagonal hole, and the hexagonal hole is located on the upper end surface of the ball head 110. The second threaded portion 120 is located below the ball head 110.

[0031] It is understandable that the operator can insert an inner hexagonal wrench into the inner hexagonal hole of the ball head 110 and rotate it to drive the second threaded portion 120 of the connecting screw 100 to be screwed in or out of the patient's screw placement position. The connecting screw 100 is an existing structure, and those skilled in the art should understand its specific structure and working principle, which will not be described in detail here.

[0032] The screw seat 300 is provided with a first screw hole 310, a first screw hole 320, a second screw hole 330 and a U-shaped opening 340. The first screw hole 310, the first screw hole 320 and the second screw hole 330 are sequentially arranged along the axial direction of the screw seat 300 and are interconnected, and also penetrate the opposite two end surfaces of the screw seat 300 along its own axial direction. The screw seat 300 can be cylindrical.

[0033] In this embodiment, the screw seat 300 has a central axis extending in the up-down direction, the first screw hole 310 is located below the first screw hole 320 and passes through the lower end surface of the screw seat 300, and the second screw hole 330 is located above the first screw hole 320 and passes through the upper end surface of the screw seat 300. The inner diameter of the first screw hole 320 is larger than the inner diameter of the first screw hole 310 and smaller than the inner diameter of the second screw hole 330. The first screw hole 310, the first screw hole 320 and the second screw hole 330 are coaxially arranged, and their central axes coincide with the central axis of the screw seat 300. The dimension of the first screw hole 320 extending along the axial direction of the screw seat 300 (that is, the up-down extension dimension of the first screw hole 320) is smaller than the dimension of the second screw hole 330 extending along the axial direction of the screw seat 300 (that is, the up-down extension dimension of the second screw hole 210).

[0034] The first screw hole 310 has a first inner spherical surface, and the first inner spherical surface is adapted to be connected with the ball head 110 of the connecting screw 100. It is understandable that after the connecting screw 100 passes through the second screw hole 330, the first screw hole 320 and the first screw hole 310 in sequence, the ball head 110 can be placed at the first screw hole 310 and can rotate relative to the first inner spherical surface, so as to adjust the installation angle of the connecting screw 100 relative to the screw seat 300 according to the surgical needs.

[0035] The U-shaped opening 340 extends from the second screw hole 330 to the first screw hole 320 along the axial direction of the screw seat 300, and the U-shaped opening 340 is open in a direction away from the first screw hole 310. There is a certain vertical spacing between the U-shaped opening 340 and the first screw hole 310. Two U-shaped openings 340 are provided, and the two U-shaped openings 340 are respectively located on opposite sides of the screw seat 300 along its radial direction.

[0036] In this embodiment, a U-shaped opening 340 is provided at both the front and rear sides of the screw seat 300, and the U-shaped opening 340 is open upward. Specifically, the upper end surface of the screw seat 300 is recessed downward to form the U-shaped opening 340, so that the operator can insert one end of the connecting rod 400 from top to bottom along the U-shaped opening 340 of the screw seat 300 until the outer peripheral surface of the connecting rod 400 contacts the lower wall surface of the U-shaped opening 340, so that the connecting rod 400 can be supported by the screw seat 300. At this time, the connecting rod 400 will be set through the two U-shaped openings 340. It can be understood that the left and right dimensions of the U-shaped opening 340 are equal to the diameter of the connecting rod 400. The upper end of the U-shaped opening 340 can be provided with a guide chamfer.

[0037] The locking screw plug 200 is connected to the first screw hole 320 of the screw seat 300, and the locking screw plug 200 can be pressed against the ball head 110 of the connecting screw 100. Specifically, the locking screw plug 200 is provided with a second screw hole 210 and a second inner angle hole 220, wherein the second screw hole 210 and the second inner angle hole 220 are sequentially arranged along the central axis of the locking screw plug 200 extending in the up-down direction, the second screw hole 210 and the second inner angle hole 220 are coaxially arranged, and their central axes coincide with the central axis of the locking screw plug 200. The second screw hole 210 has a second inner circumferential spherical surface, and the second inner circumferential spherical surface is adapted to be connected with the ball head 110 of the connecting screw 100. In this embodiment, the second screw hole 210 is located below the second inner corner hole 220 , the second screw hole 210 passes through the lower end surface of the locking screw plug 200 , the second screw hole 210 is open downward, and the second inner corner hole 220 passes through the upper end surface of the locking screw plug 200 .

[0038] It is understood that in some examples, the second screw hole 210 is connected to the second inner angle hole 220. In other examples, the second screw hole 210 is not connected to the second inner angle hole 220. After adjusting the installation angle of the connecting screw 100, the locking screw plug 200 is screwed into the first screw hole 320 of the screw seat 300, so that the locking screw plug 200 can apply a compression effect to the ball head 110 of the connecting screw 100 to ensure that the connecting screw 100 is not easy to rotate relative to the screw seat 300. The first screw hole 310 of the screw seat 300 and the second screw hole 210 of the locking screw plug 200 are arranged opposite to each other, and can jointly define a receiving cavity for accommodating the ball head 110. The first screw hole 310 and the second screw hole 210 cooperate with each other to apply a certain rotation resistance to the ball head 110, thereby preventing the connecting screw 100 from easily rotating relative to the screw seat 300 when the patient's vertebral body is pressurized or distracted.

[0039] After the locking screw 200 is installed on the screw seat 300 , the connecting rod 400 can be placed on the screw seat 300 corresponding to the U-shaped opening 340 , so that the outer circumference of the connecting rod 400 contacts the lower wall and side wall of the U-shaped opening 340 .

[0040] The end surface of the pressure seat 500 away from the locking screw plug 200 along its own axial direction is an abutting plane 510, and the end surface of the pressure seat 500 close to the locking screw plug 200 along its own axial direction is recessed to form a U-shaped groove 520, wherein the U-shaped groove 520 penetrates along the radial direction of the pressure seat 500. The pressure seat 500 is a U-shaped structure as a whole.

[0041] In this embodiment, the pressure seat 500 has a central axis extending in the up-down direction, the upper end surface of the pressure seat 500 is set as a contact plane 510, the contact plane 510 is horizontally arranged, that is, the contact plane 510 is perpendicular to the central axis of the pressure seat 500, and the lower end surface of the pressure seat 500 is provided with a U-shaped groove 520, the opening of the U-shaped groove 520 is open downward, and the U-shaped groove 520 runs through the front and rear sides of the pressure seat 500 so that the connecting rod 400 can pass through. The left and right dimensions of the U-shaped groove 520 are adapted to the diameter of the connecting rod 400. The pressure seat 500 can be put into the second screw hole 330 of the screw seat 300 from top to bottom, and the lower end of the pressure seat 500 can extend into the first screw hole 320 and contact the locking screw plug 200 located in the first screw hole 320.

[0042] During the installation of the connecting rod 400, one end of the connecting rod 400 is placed on the screw seat 300 from top to bottom, and then the pressure seat 500 is placed on the screw seat 300 from top to bottom, so that one end of the connecting rod 400 can pass through the two U-shaped openings 340 on the screw seat 300 and the U-shaped groove 520 on the pressure seat 500 along the radial direction of the screw seat 300, at which time, the outer peripheral surface of the connecting rod 400 will contact the wall surface of the U-shaped opening 340 and the wall surface of the U-shaped groove 520, and the connecting rod 400 can be pressed against the screw seat 300 and the pressure seat 500 respectively, and at the same time, one end of the pressure seat 500 close to the locking screw plug 200 can be pressed against the locking screw plug 200. Therefore, the locking screw plug 200 can be pressed by the pressure seat 500, and the connecting rod 400 can also be pressed by the pressure seat 500. There is a certain vertical distance between the locking screw plug 200 and the connecting rod 400 .

[0043] The self-breaking screw plug 600 is connected to the second screw hole 330 of the screw seat 300, and the self-breaking screw plug 600 can be pressed against the abutting plane 510 of the pressure seat 500. Specifically, the structure of the self-breaking screw plug 600 includes a twisting portion 610 and a first threaded portion 620, wherein the twisting portion 610 and the first threaded portion 620 are integrally formed with each other, and the two are coaxially arranged. It is understandable that the operator can use an appropriate tool to rotate the twisting portion 610, so that the twisting portion 610 drives the first threaded portion 620 to rotate, so that the self-breaking screw plug 600 can be screwed into the second screw hole 330 of the screw seat 300.

[0044] Moreover, a first self-breaking groove 631 is provided at the connection between the twisting part 610 and the first threaded part 620. The first self-breaking groove 631 is located on the outer peripheral surface of the connection. When viewed from the up and down direction, the first self-breaking groove 631 is annular, and the first self-breaking groove 631 is coaxially arranged with the first threaded part 620. The cross-sectional shape of the first self-breaking groove 631 is V-shaped. It can be understood that by providing the first self-breaking groove 631, the wall thickness of the connection between the twisting part 610 and the first threaded part 620 can be reduced, and the connection strength between the twisting part 610 and the first threaded part 620 can be reduced, so that the twisting part 610 and the first threaded part 620 can be driven to break and separate by a smaller twisting force, which plays a role of saving effort and reducing the difficulty of operation, so that the first threaded part 620 can be fixedly connected to the screw seat 300, and at the same time, the twisting part 610 can be removed from the screw seat 300.

[0045] Further, the first threaded portion 620 is provided with a first inner angle hole 621, and the first inner angle hole 621 is coaxially arranged with the first threaded portion 620. The twisting portion 610 is provided with a first through hole 611, and the first through hole 611 is coaxially arranged with the twisting portion 610. The aperture of the first through hole 611 is larger than the aperture of the first inner angle hole 621, and the first through hole 611 is connected with the first inner angle hole 621. In this embodiment, the twisting portion 610 is located above the first threaded portion 620.

[0046] It is understandable that, in this configuration, the first inner angle hole 621 can be manufactured in the first threaded portion 620 through the first through hole 611. After the first threaded portion 620 is separated from the screwing portion 610, the first threaded portion 620 can be removed from the screw seat 300 by inserting a tool into the first inner angle hole 621 and performing a rotation operation. In some examples, the first through hole 611 can be an inner angle hole, so that the operator can use a tool to reach into the first through hole 611 and rotate the self-breaking screw plug 600 to screw the self-breaking screw plug 600 into the second screw hole 330 of the screw seat 300. In other examples, the screwing portion 610 is in a plum blossom shape as a whole, so that the outer peripheral surface of the screwing portion 610 is applied with a wrench tool to drive the self-breaking screw plug 600 to screw into or out of the second screw hole 330.

[0047] Furthermore, a second self-breaking groove 632 is further provided at the connection between the screwing portion 610 and the first threaded portion 620. The second self-breaking groove 632 is located on the inner circumference of the connection. When viewed from the up and down direction, the second self-breaking groove 632 is in a circular ring shape, and the second self-breaking groove 632 is coaxially arranged with the first threaded portion 620. The second self-breaking groove 632 and the first self-breaking groove 631 are arranged opposite to each other inside and outside in the horizontal direction. The cross-sectional shape of the second self-breaking groove 632 is V-shaped. It can be understood that by providing the second self-breaking groove 632, the wall thickness of the connection between the screwing portion 610 and the first threaded portion 620 can be further reduced, and the connection strength between the screwing portion 610 and the first threaded portion 620 can be reduced, thereby reducing the difficulty of the self-breaking operation of the self-breaking screw plug 600.

[0048] It can be understood that after the connecting screw 100 is passed through the first screw hole 310 of the screw seat 300 and connected to the patient's vertebral position, the locking screw plug 200 is screwed into the first screw hole 320 of the screw seat 300, so that the locking screw plug 200 can tighten the connecting screw 100, so that the connecting screw 100 is fixed relative to the screw seat 300 while maintaining a certain installation angle; then, the connecting rod 400 is placed at the U-shaped opening 340 of the screw seat 300, and then the pressure seat 500 is placed in the screw seat 300, so that the connecting rod 400 passes through the U-shaped groove 520 of the pressure seat 500, and at the same time, the pressure seat 500 can abut against the locking screw plug 200; then, the self-breaking screw plug 600 is screwed into the second screw hole 330 of the screw seat 300, so that the self-breaking screw plug 600 can abut against the abutting plane 510 of the pressure seat 500.

[0049] At this time, the locking screw plug 200 can be simultaneously subjected to the threaded connection effect of the screw seat 300 and the pressing effect of the pressure seat 500, thereby strengthening the fixing effect of the locking screw plug 200 and preventing the connecting screw 100 from loosening due to the poor fixing effect of the locking screw plug 200; moreover, the self-breaking screw plug 600 applies a force to the pressure seat 500 by abutting against the abutting plane 510, so that the U-shaped groove 520 of the pressure seat 500 cooperates with the U-shaped opening 340 of the screw seat 300 to tightly fix the connecting rod 400. At the same time, the contact area between the self-breaking screw plug 600 and the abutting plane 510 is large, and the friction effect is strong. When the self-breaking and separating occurs, the self-breaking screw plug 600 will be simultaneously subjected to the friction resistance of the screw seat 300, the axial blocking effect of the connecting rod 400 on the self-breaking screw plug 600 through the pressure seat 500, and the friction between the abutting plane 510 and the self-breaking screw plug 600. This can effectively reduce the operator's twisting effect on the self-breaking screw plug 600 to reduce the difficulty of operation. In addition, the friction between the self-breaking screw plug 600 and the abutting plane 510 can effectively prevent the self-breaking screw plug 600 from being easily rotated and loosened due to the axial blocking effect applied by the connecting rod 400, thereby enhancing the fixing effect of the connecting rod 400.

[0050] Since the pressure seat 500 has a U-shaped structure, when the self-breaking screw plug 600 applies a pressing effect on the pressure seat 500, the pressure seat 500 not only presses against the connecting rod 400, but also presses against the locking screw plug 200. During this process, the two free ends (i.e., the lower ends) of the pressure seat 500 can be stretched outwards under the pressure applied by the locking screw plug 200, that is, the opening of the U-shaped groove 520 of the pressure seat 500 is enlarged, so that the pressure seat 500 can press against the connecting rod 400 and the locking screw plug 200 at the same time.

[0051] like Figure 8 As shown, in some embodiments, the pressure seat 500 is provided with an abutment portion 530, which is located at one end of the pressure seat 500 close to the locking screw plug 200, and two abutment portions 530 are provided, and the two abutment portions 530 are respectively located at opposite sides of the U-shaped groove 520. One end of the abutment portion 530 is integrally formed with the pressure seat 500, and the other end of the abutment portion 530 is bent and extended toward the pressure seat 500 in a direction away from the U-shaped groove 520 along its radial direction.

[0052] It is understandable that, in some examples, the pressure seat 500 is square when viewed in the up-down direction, and the abutment portion 530 is long strip when viewed in the up-down direction. In other examples, the pressure seat 500 is circular when viewed in the up-down direction, and the abutment portion 530 is arc-shaped when viewed in the up-down direction. By providing the abutment portion 530, the abutment portion 530 can be pressed against the locking screw plug 200, and the contact area between the abutment portion 530 and the locking screw plug 200 is increased, and the friction between the abutment portion 530 and the locking screw plug 200 is increased, so that the locking screw plug 200 is prevented from rotating easily after being installed in the first screw hole 310, and at the same time, the pressure of the pressure seat 500 on the locking screw plug 200 can be reduced, so that the locking screw plug 200 is prevented from being easily deformed.

[0053] Furthermore, the abutting portion 530 is connected to the pressure seat 500 in an arc transition, and the center angle of the abutting portion 530 is greater than or equal to 45° and less than or equal to 90°. This arrangement can avoid excessive concentration of profit at the connection between the abutting portion 530 and the pressure seat 500, thereby preventing the abutting portion 530 and the pressure seat 500 from being easily broken.

[0054] Furthermore, the contact surface between the locking screw plug 200 and the abutment portion 530 can be set to a frosted surface. Such a design can increase the friction between the locking screw plug 200 and the abutment portion 530, further increasing the difficulty of the locking screw plug 200 rotating relative to the screw seat 300, thereby preventing the connection screw 100 from being easily loosened due to the poor fixing effect of the locking screw plug 200.

[0055] In some preferred embodiments, the wall thickness of the abutment portion 530 decreases from the side close to the U-shaped groove 520 to the side away from the U-shaped groove 520, that is, the wall thickness of the abutment portion 530 decreases from top to bottom. With such a design, when the abutment portion 530 contacts the locking screw plug 200, as the self-breaking screw plug 600 is continuously screwed in, the abutment portion 530 can tightly press the locking screw plug 200 and easily deform to a certain extent, ensuring that the pressure seat 500 can press against the locking screw plug 200 and the connecting rod 400 at the same time, and at this time, the self-breaking screw plug 600 is screwed in place.

[0056] In some embodiments, the abutting plane 510 is a frosted surface, and the surface of the self-breaking screw plug 600 that contacts the abutting plane 510 is a frosted surface. It is understandable that such a setting can increase the anti-skid and wear resistance of the frosted surface, thereby increasing the friction between the self-breaking screw plug 600 and the pressure seat 500, and preventing the self-breaking screw plug 600 from rotating loose due to the axial blocking effect of the connecting rod 400, thereby strengthening the fixing effect of the connecting rod 400 on the screw seat 300.

[0057] Of course, it is not excluded that in other embodiments, only the abutting plane 510 is set as a frosted surface, or only the surface of the self-breaking screw plug 600 that contacts the abutting plane 510 is set as a frosted surface.

[0058] like Fig. 9 and Fig.10 As shown, in some embodiments, the outer circumferential surface of the screw seat 300 is provided with a third threaded portion 350 , and the third threaded portion 350 extends along the axial direction of the screw seat 300 (ie, from top to bottom).

[0059] Moreover, the structure of the self-breaking screw plug 600 also includes an inner cylinder portion 640 and an outer cylinder portion 650. The inner cylinder portion 640, the outer cylinder portion 650 and the first threaded portion 620 are coaxially arranged, one end of the inner cylinder portion 640 is integrally formed with the first threaded portion 620, and the other end of the inner cylinder portion 640 is integrally formed with the outer cylinder portion 650. The inner cylinder portion 640 is located at the periphery of the twisting portion 610, that is, the inner cylinder portion 640 surrounds the twisting portion 610, and there is a distance between the inner cylinder portion 640 and the twisting portion 610, so that the twisting portion 610 can be taken out of the inner cylinder portion 640 after being separated from the first threaded portion 620. The inner circumferential surface of the outer cylinder portion 650 is provided with a fourth threaded portion 651, and the fourth threaded portion 651 extends along the central axis of the outer cylinder portion 650 extending in the up-down direction. The outer cylinder portion 650 is located at the periphery of the screw seat 300, that is, the outer cylinder portion 650 surrounds the upper end of the screw seat 300, and the fourth threaded portion 651 on the outer cylinder portion 650 can be connected to the third threaded portion 350 on the screw seat 300.

[0060] It can be understood that the inner cylinder 640 can be cylindrical as a whole, and the outer cylinder 650 can be cylindrical as a whole, and the diameter of the outer cylinder 650 is greater than the diameter of the inner cylinder 640. The connection between the outer cylinder 650 and the inner cylinder 640 is higher than the upper end of the screw seat 300, and the inner cylinder 640 has a circular hole that passes through the upper and lower parts, and the twisting part 610 is located in the circular hole, and the inner diameter of the circular hole is greater than the outer diameter of the twisting part 610. After the connecting rod 400 is installed, the self-breaking screw plug 600 is screwed into the screw seat 300. During this process, the first threaded part 620 will be threadedly connected with the second screw hole 330 of the screw seat 300, and at the same time, the outer cylinder 650 will be threadedly connected with the third threaded part 350 of the screw seat 300. After the self-breaking screw plug 600 breaks by itself, the first threaded part 620 is separated from the twisting part 610, and the twisting part 610 can be taken out of the screw seat 300.

[0061] Since the screw seat 300 is provided with a U-shaped opening 340, the self-breaking screw plug 600 will exert a force on the screw seat 300 during the screwing process, so that the screw seat 300 is stretched outward, that is, the U-shaped opening 340 becomes larger, and the self-breaking screw plug 600 is subjected to the pressure exerted by the connecting rod 400 and the pressure seat 500, so that the self-breaking screw plug 600 has a tendency to move out of the screw seat 300, resulting in the failure of the compression effect of the self-breaking screw plug 600 on the connecting rod 400 and the locking screw plug 200, resulting in the universal vertebral arch The root screw fixing system is unstable in operation. Therefore, this embodiment adopts such a design, using the outer cylinder portion 650 to restrict the screw seat 300, preventing the screw seat 300 from being stretched outward, allowing the screw seat 300 to tightly wrap the first threaded portion 620 of the self-breaking screw plug 600, thereby enhancing the connection between the first threaded portion 620 of the self-breaking screw plug 600 and the second screw hole 330 of the screw seat 300, thereby ensuring that the self-breaking screw plug 600 has a good fixing effect on the screw seat 300.

[0062] In the manufacturing process of the self-breaking screw plug 600, if it is inconvenient to manufacture the first self-breaking groove 631, only the second self-breaking groove 632 can be manufactured. In addition, the self-breaking screw plug 600 can be printed and manufactured using existing mature 3D printing technology.

[0063] Furthermore, the pressure seat 500 is provided with a guide portion 540, which is integrally formed with the pressure seat 500 and is located on a side of the U-shaped groove 520 close to the abutting plane 510, that is, the guide portion 540 is provided on the upper part of the pressure seat 500 and above the U-shaped groove 520. Two guide portions 540 are provided and are respectively provided on opposite sides of the pressure seat 500, and the two guide portions 540 correspond to the two U-shaped openings 340 respectively and can be slidably connected.

[0064] When installing the pressure seat 500 on the screw seat 300, align the guide part 540 with the corresponding U-shaped opening 340 so that the guide part 540 can slide downward along the side wall of the U-shaped opening 340. The guide part 540 cooperates with the U-shaped opening 340 to achieve the positioning of the pressure seat 500 and ensure that the pressure seat 500 can move downward stably.

[0065] Moreover, the guide portion 540 is protruding from the U-shaped opening 340 and has an arc surface which can be adapted to connect with the outer circumference of the connecting rod 400 and is located at the lower side of the guide portion 540. The guide portion 540 is rectangular when viewed from top to bottom.

[0066] It is understandable that after the pressure seat 500 is installed, the arc surface of the guide portion 540 contacts the outer peripheral surface of the connecting rod 400. Moreover, after the self-breaking screw plug 600 is installed, the outer cylinder portion 650 can press against the guide portion 540. At this time, the guide portion 540 will be clamped by the connecting rod 400 and the outer cylinder portion 650. Then, the outer cylinder portion 650 can exert a certain compression effect on the pressure seat 500 and the connecting rod 400 through the guide portion 540, so that the pressure seat 500 and the connecting rod 400 are fixed more firmly on the screw seat 300, and the guide portion 540 can be prevented from being easily deformed due to the pressure of the outer cylinder portion 650.

[0067] It can be understood that the inner corner hole mentioned in the above embodiment can be an inner hexagonal hole, an inner quadrangular hole or a plum blossom-shaped hole, etc., which is convenient for the operator to insert the inner corner hole with the help of existing tools and perform rotation operations.

[0068] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0069] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A universal pedicle screw fixation system, comprising a connecting rod and a fixing assembly, wherein two fixing assemblies are provided and are respectively located on opposite sides of the connecting rod along its own axial direction; characterized in that: The fixing assembly comprises: A connecting screw, which is used to connect the vertebral body, wherein one end of the connecting screw along its own axial direction is a ball head; A screw seat, which is provided with a first screw hole, a first screw hole, a second screw hole and a U-shaped opening, wherein the first screw hole, the first screw hole and the second screw hole are sequentially connected along the axial direction of the screw seat and penetrate the two opposite end surfaces of the screw seat along its own axial direction, the first screw hole has a first inner circumferential spherical surface adapted to be connected with the ball head, the U-shaped opening extends from the second screw hole to the first screw hole along the axial direction of the screw seat, and the U-shaped opening is provided with two and is respectively located on opposite sides of the screw seat along its radial direction; A locking screw plug connected to the first screw hole and pressed against the ball head; The pressure seat is in a U-shaped structure, wherein one end face of the pressure seat along its own axial direction away from the locking screw plug is an abutting plane, and one end face close to the locking screw plug is recessed to form a U-shaped groove, and the U-shaped groove passes through the radial direction of the pressure seat; one end of the connecting rod is respectively provided in the two U-shaped openings and the U-shaped groove along the radial direction of the screw seat, and is respectively pressed against the screw seat and the pressure seat, and at the same time, one end of the pressure seat close to the locking screw plug is pressed against the locking screw plug; A self-breaking screw plug is connected to the second screw hole and pressed against the abutting plane.

2. The universal pedicle screw fixation system according to claim 1, characterized in that: The pressure seat is provided with an abutment portion at one end close to the locking screw plug, and two abutment portions are provided and respectively located on opposite sides of the U-shaped groove. One end of the abutment portion is integrally formed with the pressure seat, and the other end of the abutment portion is bent and extended toward the pressure seat in a direction radially away from the U-shaped groove.

3. The universal pedicle screw fixation system according to claim 2, characterized in that: The abutting portion is connected to the pressure seat in an arc transition, and the center angle of the abutting portion is greater than or equal to 45° and less than or equal to 90°.

4. The universal pedicle screw fixation system according to claim 3, characterized in that: The wall thickness of the abutting portion decreases from a side close to the U-shaped groove to a side away from the U-shaped groove.

5. The universal pedicle screw fixation system according to claim 1, characterized in that: The abutting plane is a frosted surface; and / or, The surface of the self-breaking screw plug in contact with the abutment plane is a frosted surface; and / or, The locking screw plug is coaxially provided with a second screw hole and a second inner angle hole, and the second screw hole has a second inner circumferential spherical surface that is adaptively connected to the ball head.

6. The universal pedicle screw fixation system according to claim 1, characterized in that: The self-breaking screw plug includes a screwing portion and a first threaded portion that are integrally formed and coaxially arranged with each other. The outer peripheral surface of the connection between the screwing portion and the first threaded portion is provided with a first self-breaking groove. The first self-breaking groove is circular and is coaxially arranged with the first threaded portion. The cross-sectional shape of the first self-breaking groove is V-shaped.

7. The universal pedicle screw fixation system according to claim 6, characterized in that: The first threaded portion is coaxially provided with a first inner angle hole, the screwing portion is coaxially provided with a first through hole, the aperture of the first through hole is larger than the aperture of the first inner angle hole, and the first through hole is connected with the first inner angle hole.

8. The universal pedicle screw fixation system according to claim 7, characterized in that: A second self-breaking groove is provided on the inner circumference of the connection between the twisting part and the first threaded part. The second self-breaking groove is annular and is coaxially arranged with the first threaded part. The cross-section of the second self-breaking groove is V-shaped.

9. The universal pedicle screw fixation system according to any one of claims 6 to 8, characterized in that: The outer circumferential surface of the screw seat is provided with a third threaded portion, and the self-breaking screw plug also includes an inner cylinder portion and an outer cylinder portion, the inner cylinder portion, the outer cylinder portion and the first threaded portion are coaxially arranged, one end of the inner cylinder portion is integrally formed with the first threaded portion, and the other end of the inner cylinder portion is integrally formed with the outer cylinder portion, the inner cylinder portion is located at the periphery of the screwing portion, and there is a spacing between the inner cylinder portion and the screwing portion, the inner circumferential surface of the outer cylinder portion is provided with a fourth threaded portion, the outer cylinder portion is located at the periphery of the screw seat, and the fourth threaded portion is connected to the third threaded portion.

10. The universal pedicle screw fixation system according to claim 9, characterized in that: The pressure seat is provided with guiding parts corresponding to the U-shaped opening on opposite sides, and the guiding parts are located on the side of the U-shaped groove close to the abutting plane. The guiding parts can slide along the side wall surface of the U-shaped opening, and the guiding parts are arranged to protrude from the U-shaped opening. The guiding parts have an arc surface that can be adapted and connected with the outer peripheral surface of the connecting rod, and the outer cylinder part can be pressed against the guiding parts.

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