Pedicle screw fixing device

Abstract

The pedicle screw fixing device comprises a pedicle screw body, an extension mechanism and a locking piece, the pedicle screw body comprises a screw sleeve and a screw, the end, in the first direction, of the screw is connected into the screw sleeve, and the side, away from the screw, of the screw sleeve is provided with at least two limiting parts; the at least two limiting parts are arranged at intervals in the circumferential direction of the screw sleeve to define a limiting groove; the extension mechanism is detachably connected with the at least two limiting parts, and the extension mechanism is provided with a mounting channel communicating with the limiting groove in the first direction; and the locking piece is at least used for pressing the connecting rod into the limiting groove along the mounting channel and locking the connecting rod in the limiting groove. The utility model solves the problems that the processing cost is higher, the material loss is large and the tissue irritation is easily caused when the pedicle screw is lifted, and the short-tail pedicle screw is difficult to press, complicated to operate and the like.

Description

Technical Field

[0001] The present application relates to the technical field of medical devices, and in particular to a pedicle screw fixation device. Background Art

[0002] At present, intervertebral disc herniation is one of the more common diseases, mainly because of the different degrees of degenerative changes in various parts of the intervertebral disc, which leads to the loss of intervertebral disc height and the loss of normal vertebral physiological curvature. Nowadays, a pedicle screw is required for surgical treatment of thoracolumbar degenerative diseases, lumbar instability and intervertebral disc diseases at home and abroad, and decompression of lumbar fusion surgery is supplemented with effective fixation to maintain segmental stability and physiological curvature. During clinical use, the pedicle screw is usually inserted into the vertebral body along the pedicle of the surgical site, and then the pedicle screws of the surgical site are connected by a connecting rod to achieve vertebral reduction and fixation.

[0003] With the optimization of clinical treatment plans and the needs of patients, more and more patients prefer minimally invasive nail rod surgery (i.e., several local incisions are made in the patient's spine to insert the nail rods, and the surgical environment is narrow). However, the disadvantages of minimally invasive surgery are also obvious. The learning cycle is long, the doctor's nail placement skills are high, and the accuracy of nail placement can only be ensured under repeated fluoroscopy (too many radiation times affect the patient). Therefore, at present, conventional surgery basically chooses open surgery (open surgery is a surgical method in which the skin is cut in the part where the spine is located to completely expose the bone part) as the first choice for posterior internal fixation technology to treat the disease, and the nail rod fixation technology is performed under the exposed field of vision. The screws used in conventional open nail rod fixation surgery are short-tail pedicle screws and lifting pedicle screws. The difference between the two pedicle screws is the length of the thread set in the screw seat. The length of the thread in the short-tail pedicle screw seat along its own axis is shorter. The length of the thread in the lifting pedicle screw seat along its own axis is longer, and a breaking groove is set in the screw seat.

[0004] The difference in thread length between the two types of screws is reflected in clinical use. The short tail needs to be reset by pressing the connecting rod with the help of an external tool, while the lifting pedicle screw only needs to place the connecting rod into the U-shaped groove of the nail tail and rotate it with the top screw to achieve the lifting and reset of the vertebral body. Although the lifting pedicle screw can achieve the lifting and reset function of the vertebral body by pressing the rod with the top screw without the help of external force, after the lifting pedicle screw achieves the lifting and reset function, the longer tail of the screw seat needs to be broken from the breaking groove and discarded to avoid the excessively long screw seat affecting rehabilitation. Compared with the short-tail pedicle screw, the lifting pedicle screw has a higher processing cost and greater material loss. And after the tail of the screw seat is broken, it is easy to form a sharp thorn edge, causing tissue irritation and tingling. Although the short-tail pedicle screw has a lower processing cost and lower material loss than the lifting pedicle screw, it will not cause tissue irritation and tingling. However, it is difficult to press the connecting rod into the short-tail pedicle screw and pull it up to reduce it, which requires the use of a rod pressing instrument. Especially when performing vertebral reduction surgery on multi-segment vertebrae, the combined use of short-tail pedicle screws and connecting rods is particularly difficult during the rod placement process. The connecting rod is not easy to put into the screw seats of multiple short-tail pedicle screws, and the operation is relatively cumbersome, which is difficult to be accepted by clinicians in clinical operations where every second counts.

[0005] It can be seen that among the currently available pedicle screws, the lifting pedicle screws have the problems of high processing cost, large material loss, and easy to cause tissue irritation and stinging, while the short-tail pedicle screws have the problems of difficulty in pressing the rod and cumbersome operation. Utility Model Content

[0006] The main purpose of the present application is to provide a pedicle screw fixation device, which at least solves the problems mentioned in the background technology, such as high processing cost, large material loss, and easy tissue irritation of the lifting pedicle screw, and difficulty in pressing the rod and cumbersome operation of the short-tail pedicle screw.

[0007] According to a first aspect of an embodiment of the present application, a pedicle screw fixation device is provided, comprising:

[0008] A pedicle screw body, the pedicle screw body comprising a screw sleeve and a screw, one end of the screw along a first direction is connected to the screw sleeve, the screw sleeve has at least two limiting parts on a side away from the screw, and the at least two limiting parts are arranged at intervals along the circumference of the screw sleeve to surround and form a limiting groove;

[0009] An extension mechanism, the extension mechanism being detachably connected to at least two of the limiting portions, and the extension mechanism being provided with a mounting channel communicating with the limiting groove along a first direction;

[0010] A locking piece, the locking piece is at least used to press the connecting rod into the limiting groove along the installation channel and lock the connecting rod in the limiting groove.

[0011] Furthermore, the extension mechanism includes at least two extension components, and the at least two extension components are detachably connected to at least two limiting portions in a one-to-one correspondence, and the installation channel is formed by the at least two extension components.

[0012] Furthermore, the extension component comprises:

[0013] An extension piece, one end of which along the first direction is detachably buckled with the limiting portion through a buckling assembly.

[0014] Furthermore, the extension piece comprises:

[0015] Main body;

[0016] The connecting portion is located on one side of the main body along the first direction, and the connecting portion is provided with an avoidance groove, and the avoidance groove is recessed along a direction close to the main body to divide the connecting portion into at least two connecting pieces, and the buckle assembly is arranged between at least two of the connecting pieces and the limiting portion.

[0017] Furthermore, the extension component also includes:

[0018] A sleeve portion, the sleeve portion is connected to at least two of the connecting pieces and can be moved along a first direction to a position away from the connecting pieces, and the sleeve portion is used to limit at least two of the connecting pieces to the limiting portion.

[0019] Furthermore, the sleeve portion includes:

[0020] A connecting sleeve, wherein the connecting sleeve is covered on at least two of the connecting sheets, and at least one side of the connecting sleeve along the second direction is slidably connected to the extension sheet via a sliding connection component.

[0021] Furthermore, the sliding connection assembly comprises:

[0022] A slide rail, wherein the slide rail comprises at least two slide rails, and the at least two slide rails are respectively arranged on both sides of the extension piece along the second direction;

[0023] A slide groove, wherein the slide groove is adapted to the slide rail, and the slide groove comprises at least two slide grooves, wherein the at least two slide grooves are respectively arranged on both sides of the connecting sleeve along the second direction, and are arranged in a one-to-one correspondence with the at least two slide rails.

[0024] Furthermore, a stop portion is provided on a surface of the extension piece away from the axis of the screw sleeve, the stop portion is located on a side of the connecting portion away from the main body portion, and the sleeve connection portion abuts against the stop portion.

[0025] Furthermore, the buckle assembly comprises:

[0026] A clamping protrusion, wherein the clamping protrusion is arranged on one of the extension piece and the limiting portion;

[0027] A card slot is matched with the card protrusion and is arranged on the other of the extension piece and the limiting part.

[0028] Further, the connecting portion includes at least two connecting sections, at least one of the connecting sections is connected to the main body, at least one of the connecting sections is provided with a connecting groove adapted to the limiting portion, the clamping protrusion is arranged in the connecting groove, and the clamping groove is arranged on the outer surface of the limiting portion on one side close to the connecting portion.

[0029] Further, the locking member includes a top screw, the outer peripheral surface of the top screw is provided with an external thread, the limiting groove is provided with a first internal thread adapted to the external thread, and the connecting section includes:

[0030] a first connecting section, the first connecting section being connected to the main body;

[0031] a second connecting section, the second connecting section being connected to an end of the first connecting section away from the main body;

[0032] a third connecting section, the third connecting section being connected to an end of the second connecting section away from the first connecting section, the connecting groove being arranged on the third connecting section;

[0033] Wherein, a second internal thread is provided in the second connecting section, and the second internal thread extends from an end of the second connecting section close to the first connecting section to an end close to the third connecting section;

[0034] And / or, along the first direction, the length of the card slot is greater than the length of the card protrusion.

[0035] Furthermore, the second connecting section includes a threaded section and a light hole section, the threaded section is located on a side of the second connecting section close to the first connecting section, the light hole section is located on a side of the second connecting section close to the third connecting section, the second internal thread is located in the threaded section, and the length of the light hole section along the first direction is greater than the length of the top screw along the first direction.

[0036] Compared with the prior art, the technical solution of this application has at least the following technical effects:

[0037] The screw sleeve of the pedicle screw fixing device provided by the present application is detachably connected with an extension mechanism, and the extension mechanism is provided with an installation channel connected to the limit groove on the screw sleeve, and the locking member can press the connecting rod into the limit groove along the installation channel, and lock the connecting rod in the limit groove, and the pressing rod operation is convenient. In particular, in multi-segment vertebral reduction surgery, after multiple pedicle screw bodies are placed on multiple vertebrae, the connecting rod can be conveniently, quickly and accurately placed into the limit groove with the help of the installation channel of the extension mechanism on the multiple pedicle screw bodies. After the vertebra to be reset is lifted and reset by means of the rigid bracket composed of the pedicle screw body and the connecting rod, the extension mechanism can be disassembled, and since the screw sleeve will not produce sharp thorn edges after the extension mechanism is disassembled, it can avoid tissue irritation and tingling, and avoid the occurrence of related inflammation caused by pain in the surgical area of ​​the patient after surgery. The disassembled extension mechanism can be reused, which reduces the material loss of the pedicle screw fixing device and reduces the manufacturing cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0039] Figure 1 A schematic diagram of the disassembled structure of a pedicle screw fixing device provided in one embodiment of the utility model;

[0040] Figure 2 for Figure 1 A magnified schematic diagram of part A;

[0041] Figure 3 It is a schematic diagram of the connection structure between the extension piece and the pedicle screw body;

[0042] Figure 4 for Figure 3 A magnified schematic diagram of part B;

[0043] Figure 5 for Figure 3 A magnified schematic diagram of part C;

[0044] Figure 6 It is a structural schematic diagram of the connecting sleeve;

[0045] Figure 7 It is a schematic diagram of the structure of the pedicle screw fixation device including a connecting sleeve;

[0046] Figure 8 This is a schematic diagram of the operation of inserting the connecting rod laterally;

[0047] Fig. 9 It is a structural schematic diagram of the extension piece;

[0048] Fig.10 It is a structural schematic diagram of the extension piece;

[0049] Fig.11 It is a schematic diagram of the structure of the extension piece.

[0050] The above drawings include the following reference numerals:

[0051] 10. Pedicle screw body; 11. Screw sleeve; 111. Limiting part; 112. Limiting groove; 121. First internal thread; 12. Screw; 13. Clamping groove; 20. Extension piece; 21. Main body; 22. Avoiding groove; 23. Connecting piece; 231. First connecting section; 232. Second connecting section; 321. Second internal thread; 322. Threaded section; 323. Light hole section; 233. Third connecting section; 24. Slide rail; 25. Stopper; 26. Clamping convexity; 27. Connecting groove; 30. Connecting sleeve; 31. Slide groove; 40. Connecting rod. DETAILED DESCRIPTION

[0052] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0053] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0054] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps set forth in these embodiments do not limit the scope of the present application. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, methods and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be considered as a part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, and therefore, once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0055] In order to solve the problems of high processing cost, large material loss, easy tissue irritation, difficulty in pressing the short-tail pedicle screw, and complicated operation of the existing lifting pedicle screw, the utility model provides a pedicle screw fixing device, see Figures 1 to 7 The pedicle screw fixing device includes a pedicle screw body 10, an extension mechanism and a locking member. The pedicle screw body 10 includes a screw sleeve 11 and a screw 12, and one end of the screw 12 along the first direction is connected to the screw sleeve 11. Usually, the screw 12 is connected to the screw sleeve 11 through a locking ring, and the surface of the locking ring away from the screw 12 is an arc-shaped groove structure that matches the outer surface of the connecting rod 40. After the connecting rod 40 is placed in the limiting groove 112, the connecting rod 40 will press the locking ring under pressure until the screw 12 is firmly and stably fixed on the vertebral body. Figures 1 to 3 As shown, the side of the screw sleeve 11 away from the screw 12 has at least two limiting portions 111, and the at least two limiting portions 111 are arranged at intervals along the circumference of the screw sleeve 11 to surround and form a limiting groove 112, and the limiting groove 112 is used to accommodate the portion of the connecting rod 40 that is connected to the pedicle screw body 10. The extension mechanism is detachably connected to the at least two limiting portions 111, and along the first direction, the extension mechanism is provided with an installation channel connected to the limiting groove 112, and the installation channel and the limiting groove 112 both have avoidance holes that pass through along the axial direction of the connecting rod 40, so that the connecting rod 40 can be connected in series with multiple pedicle screw bodies 10 to form a rigid support structure required for lifting and reduction. The locking member is at least used to press the connecting rod 40 into the limiting groove 112 along the installation channel, and lock the connecting rod 40 in the limiting groove 112. The first direction in this embodiment is the axial direction of the screw 12, that is, Figure 1 The direction indicated by the arrow X.

[0056] In clinical surgery, due to sagittal dislocation of adjacent vertebrae, in order to restore the physiological curvature of the vertebrae, it is necessary to lift and reset the vertebrae to be reset that have lost their curvature. The conventional operation method is that first, multiple pedicle screw bodies 10 need to be placed along the pedicles on multiple sections of normal vertebrae adjacent to the vertebrae to be reset (i.e., the vertebrae with lost physiological curvature). The connecting rod is placed into the limiting groove 112 of the multiple pedicle screw bodies 10 through the locking member to form a rigid support structure. Then, a predetermined pedicle screw body 10 is placed on the vertebrae to be reset, and the locking member is screwed into the installation channel on the predetermined pedicle screw body 10 to press the connecting rod 40 in the direction of the limiting portion 111, and with the support force provided by the formed rigid support, the vertebrae to be reset is pulled back to the original curvature position under the joint action of the locking member and the rigid support, thereby achieving lifting and reset.

[0057] Before the lifting and reduction, due to the difference in the spatial position of different vertebrae, the limiting groove 112 of individual pedicle screw bodies 10 may deviate from the predetermined installation space, affecting the insertion of the connecting rod 40. If one of the pedicle screw bodies 10 is relatively dislocated with respect to other pedicle screw bodies 10, that is, it is not in the same installation space with other pedicle screw bodies 10, if there is no installation channel of the extension mechanism (equivalent to the case of directly using a short-tail pedicle screw), it will be necessary to use additional equipment to apply a large force to push the connecting rod 40 into the limiting groove 112 of the pedicle screw body 10 with a large dislocation, while the present embodiment can make the installation channels on the multiple pedicle screw bodies 10 basically located in the same installation space by swinging and adjusting the extension mechanism, thereby ensuring that each part of the connecting rod 40 along its own length direction can smoothly enter and lock in the limiting groove 112 along the corresponding installation channel. Thus, the present embodiment adjusts the angle of the pedicle screw body 10 that deviates from the predetermined installation space by swinging the installation channel of the extension mechanism, and adjusts the installation channels on multiple pedicle screw bodies 10 to the same spatial angle, so that the connecting rod 40 can smoothly enter the limiting groove 112 along the installation channels on each pedicle screw body 10, and the rod pressing operation is efficient and simple. Moreover, since the extension mechanism is detachable and reusable, the material loss is small and it is not easy to cause tissue irritation.

[0058] It can be seen that the screw sleeve 11 of the pedicle screw fixing device provided in this embodiment is detachably connected with an extension mechanism, and the extension mechanism is provided with an installation channel connected to the limit groove 112 on the screw sleeve 11, and the locking member can press the connecting rod 40 into the limit groove 112 along the installation channel, and lock the connecting rod 40 in the limit groove 112, and the pressing rod operation is convenient. In particular, in multi-segment vertebral reduction surgery, after multiple pedicle screw bodies 10 are placed on multiple vertebral bodies, the connecting rod 40 can be conveniently, quickly and accurately placed into the limit groove 112 by means of the installation channel of the extension mechanism on the multiple pedicle screw bodies 10. After the vertebral body to be reduced is lifted and reduced by means of the rigid bracket formed by the pedicle screw body 10 and the connecting rod 40, the extension mechanism can be removed. Since no sharp thorn edge will be produced on the screw sleeve 11 after the extension mechanism is removed, it can avoid tissue irritation and tingling, and avoid the occurrence of related inflammation caused by pain in the surgical area of ​​the patient after surgery. The disassembled extension mechanism can be reused, thereby reducing the material loss of the pedicle screw fixation device and lowering the production cost.

[0059] The extension mechanism in this embodiment includes at least two extension components, and the at least two extension components are detachably connected to at least two limit portions 111 in a one-to-one correspondence, and the installation channel is formed by the at least two extension components. Figure 2As shown, the limiting groove 112 is a U-shaped groove of a U-shaped structure formed by two limiting parts 111 arranged at intervals, each limiting part 111 is detachably connected to an extension component, and the installation channel is an installation space formed by the two extension components. Figure 8 As shown, in this embodiment, different extension components can be separately disassembled and assembled on the corresponding limiting portions 111. When the spatial angles of the limiting grooves 112 on the multiple pedicle screw bodies 10 are not in the same plane, which makes it difficult to insert the connecting rod 40, since different extension components can be separately disassembled and assembled, at least one of the extension components can be removed, and then the part of the connecting rod 40 that cannot be inserted into the corresponding limiting groove 112 can be pressed into the limiting groove 112 along the radial direction of the screw sleeve 11 from the limiting portion 111 from which the extension component has been removed, thereby realizing the lateral insertion of the connecting rod 40. The connecting rod 40 can be quickly inserted without removing the connecting rod 40 again, thereby shortening the operation time and reducing the amount of bleeding for the patient.

[0060] Therefore, the present embodiment obtains the possibility of inserting the connecting rod 40 into the limiting groove 112 laterally by removing the extension component on one side. This is because in clinical use, after the pedicle screw body 10 is inserted into the vertebral body along the pedicle, the spatial angles of different pedicle screw bodies 10 are different, resulting in that the positions of the limiting grooves 112 on different pedicle screw bodies 10 cannot be on the same plane, and the limiting grooves 112 of multiple pedicle screw bodies 10 and the connecting rod 40 are often misaligned. In the present embodiment, by designing at least two independently detachable extension components, after removing one of the extension components, the portion of the connecting rod 40 outside the limiting groove 112 can be pushed into the corresponding limiting groove 112 by means of a rod pressing tool. After reinstalling the extension component, screw the locking piece along the installation channel and lock the part where the connecting rod 40 is re-inserted. With the help of the rigid support composed of multiple pedicle screw bodies 10 and the connecting rod 40, the vertebral body to be relocated that has lost its physiological curvature is relocated. After relocation, all extension components can be removed from the limiting portion 111.

[0061] like Figure 1 , Figure 3 as well as Figures 7 to 11As shown, the extension component in this embodiment includes an extension piece 20, and one end of the extension piece 20 along the first direction is detachably buckled with the limiting portion 111 through a buckle assembly. The installation channel in the extension mechanism is formed by the multiple extension pieces 20. Thus, the connecting rod 40 can be placed into the limiting groove 112 along the installation channel formed by the multiple extension pieces 20 under the pressing action of the locking member. In this embodiment, the extension piece 20 is quickly loaded and unloaded through the buckle assembly, and the extension piece 20 is removed after the operation is completed without generating sharp thorns to cause tissue irritation and tingling. In a multi-segment vertebral reduction operation, if the spatial angles of the limiting grooves 112 on the multiple pedicle screw bodies 10 are not in the same plane, since the extension piece 20 has a length along the first direction, the installation channels on the multiple pedicle screw bodies 10 can be adjusted to the same installation space by swinging the extension piece 20, thereby ensuring that the locking member can smoothly place the connecting rod 40 along the corresponding installation channel and lock it in the limiting groove 112, and finally achieve the lifting and reduction of the vertebral body. Compared with the traditional short-tail pedicle screw pressing method, it is more efficient and simple. Compared with the method of breaking the tail of the screw seat after pulling the pedicle screw to reset, since the extension piece 20 can be disconnected from the limit part 111 through the buckle assembly, not only will the limit part 111 not have sharp edges to bring postoperative burden and infection risks to the patient, but also the production cost can be reduced by reusing the extension piece 20.

[0062] Among them, Figures 9 to 11 As shown, the extension piece 20 includes a main body 21 and a connecting part, and the connecting part is used to connect with the limiting part 111. The connecting part is located on one side of the main body 21 along the first direction, and is provided with an avoidance groove 22. The avoidance groove 22 is recessed in a direction close to the main body 21 to divide the connecting part into at least two connecting pieces 23. In this embodiment, the buckle assembly is arranged between at least two connecting pieces 23 and the limiting part 111. When the connecting part of the extension piece 20 is buckled with the limiting part 111 through the buckle assembly, since the single-piece connecting piece 23 is smaller in volume and easy to deform elastically, the at least two connecting pieces 23 can be stretched apart and buckled with the limiting part 111 through the buckle assembly, thereby realizing the rapid installation of the extension piece 20. When the extension piece 20 needs to be removed from the limiting part 111, the connecting piece 23 is stretched apart until it is separated from the limiting part 111.

[0063] The extension component in this embodiment also includes a sleeve portion, which is connected to at least two connecting pieces 23 and can be moved along the first direction to a position away from the connecting piece 23. In this embodiment, at least two connecting pieces 23 are limited to the limiting portion 111 by the sleeve portion, so that in the process of pressing the connecting rod 40 into the limiting groove 112 along the installation channel formed by the extension piece 20, the connecting piece 23 will not shake relative to the limiting portion 111 or even break away from the limiting portion 111 due to the contact and compression of the connecting rod 40 and / or the locking member, thereby improving the firmness and stability of the buckle between the connecting piece 23 and the limiting portion 111. When it is necessary to remove the extension piece 20, the sleeve portion can be moved along the first direction to a position away from the connecting piece 23 or directly separated from the extension piece 20. The operation is efficient and convenient, which can greatly shorten the operation time of the operation, reduce the burden of the disassembly operation on the patient, and does not require high technical skills of clinical users.

[0064] Specifically, the sleeve connection portion in the present embodiment includes a connecting sleeve 30, which is covered on at least two connecting pieces 23, and the connecting sleeve 30 is slidably connected to the extension piece 20 via a sliding connection assembly on at least one side along the second direction. After the extension piece 20 is quickly buckled onto the limiting portion 111 by utilizing the characteristic that the connecting piece 23 is easy to elastically deform, the connecting sleeve 30 is slidably connected to the extension piece 20 via the sliding connection assembly, and is slid to a position that covers all the connecting pieces 23 on the extension piece 20, so as to prevent the connecting piece 23 from being offset from the buckling with the limiting portion 111 or even detaching from the limiting portion 111 due to force during the operation. When the extension piece 20 needs to be removed, the connecting sleeve 30 is slid along the first direction via the sliding connection assembly until it is separated from the extension piece 20. The second direction in the present embodiment is Figure 6 The direction indicated by the arrow Y.

[0065] The sliding connection assembly includes a slide rail 24 and a slide groove 31. The slide rail 24 includes at least two, and the at least two slide rails 24 are respectively arranged on both sides of the extension piece 20 along the second direction. The slide groove 31 is adapted to the slide rail 24, and the slide groove 31 includes at least two, and the at least two slide grooves 31 are respectively arranged on both sides of the connecting sleeve 30 along the second direction, and the at least two slide grooves 31 are arranged one-to-one with the at least two slide rails 24. Therefore, when it is necessary to fix the connecting piece 23 on the extension piece 20, the slide groove 31 of the connecting sleeve 30 is engaged with the slide rail 24 on the extension piece 20 and moved along the first direction to a position covering each connecting piece 23, thereby improving the connection firmness between the connecting piece 23 and the limiting portion 111. When it is necessary to remove the extension piece 20, the connecting sleeve 30 is moved along the first direction to be separated from the extension piece 20. Therefore, this embodiment is not only easy to process through the cooperation of the slide groove 31 and the slide rail 24, but also greatly improves the assembly efficiency between the connecting sleeve 30 and the extension piece 20.

[0066] The surface of the extension piece 20 away from the axis of the screw sleeve 11 is provided with a stopper 25, which is located on the side of the connection part away from the main body 21, and the sleeve part abuts against the stopper 25. In this embodiment, the sleeve part is limited by the stopper 25, and the sleeve part can be easily and quickly moved to a suitable position to limit the connecting piece 23 to the limiting part 111, so as to prevent the connecting piece 23 from being misaligned with the limiting part 111 or even separated from the limiting part 111 due to force. When the sleeve part is a connecting sleeve 30, the slide groove 31 of the connecting sleeve 30 is engaged with the slide rail 24 on the extension piece 20 and moved to the stopper 25 along the first direction, so that each connecting piece 23 can be covered, further improving the assembly efficiency and accuracy between the connecting sleeve 30 and the connecting piece 23. Specifically, the stopper 25 in this embodiment is an annular platform arranged on the surface of the extension piece 20 along the circumference of the screw sleeve 11, and the connecting sleeve 30 abuts against the surface of the annular platform after being inserted into the connecting piece 23. It can be seen that the stopper 25 can prevent the connecting sleeve 30 from excessively moving and affecting the fixing effect of the connecting sleeve 30 on the connecting piece 23, so that the connecting sleeve 30 can firmly connect the connecting piece 23, thereby preventing the connecting piece 23 from being elastically deformed by force and being misaligned or even separated from the limiting portion 111.

[0067] In this embodiment, the fastening assembly for fastening the extension piece 20 to the limiting portion 111 includes a protrusion 26 and a slot 13. The protrusion 26 is arranged on one of the extension piece 20 and the limiting portion 111. The slot 13 is adapted to the protrusion 26 and is arranged on the other of the extension piece 20 and the limiting portion 111. In this embodiment, the fastening assembly 13 or the protrusion 26 can be arranged on the connecting portion of the extension piece 20. Since the connecting portion is composed of a plurality of connecting pieces 23 that are easy to elastically deform, the slot 13 and the protrusion 26 can be conveniently and quickly fastened together or separated after each connecting piece 23 is opened, so as to realize the fast installation or disassembly of the extension piece 20.

[0068] The connection part in this embodiment includes at least two connection sections, at least one of which is connected to the main body 21, and at least one of which is provided with a connection groove 27 adapted to the position limiting part 111. The clamping protrusion 26 is arranged in the connection groove 27, and the clamping groove 13 is arranged on the outer surface of the position limiting part 111 close to the connection part. When the connection part is at least two connection pieces 23, that is, each connection piece 23 includes at least two connection sections, the structure of the extension piece 20 can be as follows: Fig. 9The structure shown. In this embodiment, the protrusion 26 is arranged in the connecting groove 27. After the connecting part and the limiting part 111 are quickly positioned and the limiting part 111 is sleeved by the connecting groove 27, the protrusion 26 in the connecting groove 27 is inserted into the slot 13 on the limiting part 111, which further improves the connection firmness between the connecting part and the limiting part 111, and the assembly is efficient and accurate. In addition, when the connecting part is a plurality of connecting pieces 23, since the connecting pieces 23 are prone to elastic deformation, each connecting piece 23 can be opened at a certain angle, and after the protrusion 26 is aligned with the slot 13 on the limiting part 111, the connecting piece 23 can be released to allow the protrusion 26 to be inserted into the slot 13. When the extension piece 20 needs to be removed, the connecting sleeve 30 on the connecting piece 23 is removed, and the connecting piece 23 is pulled again to produce elastic deformation so that the connecting piece 23 is gradually separated from the limiting part 111 until the protrusion 26 is separated from the slot 13, that is, the rapid removal of the extension piece 20 is realized.

[0069] The locking member in this embodiment includes a top screw, and the outer peripheral surface of the top screw is provided with an external thread. The limiting groove 112 is provided with a first internal thread 121 adapted to the external thread. Fig.10 As shown, the connecting section of the connecting portion includes a first connecting section 231, a second connecting section 232 and a third connecting section 233. The first connecting section 231 is connected to the main body 21. The second connecting section 232 is connected to one end of the first connecting section 231 away from the main body 21. The third connecting section 233 is connected to one end of the second connecting section 232 away from the first connecting section 231, and the connecting groove 27 is provided in the third connecting section 233. Among them, a second internal thread 321 is provided in the second connecting section 232, and the second internal thread 321 extends from one end of the second connecting section 232 close to the first connecting section 231 to one end close to the third connecting section 233. In the process of the top screw pressing the connecting rod 40 into the limiting groove 112, when it reaches the second connecting section 232, it is screwed into the second internal thread 321, so as to stably and continuously apply downward pressure toward the limiting groove 112 to the connecting rod 40 until it cooperates with the first internal thread 121 in the limiting groove 112 and tightens the connecting rod 40 in the limiting groove 112.

[0070] Secondly, the role of the second internal thread 321 is also mainly reflected in the stage of lifting and resetting the vertebral body to be reset. Specifically, after the pedicle screw body 10 is placed on multiple vertebral bodies near the vertebral body to be reset and the connecting rod 40 is connected to form a rigid bracket, a pedicle screw body 10 is placed on the vertebral body to be reset. Since there is a large gap in spatial position between the vertebral body to be reset and other vertebral bodies, the bottom of the limiting groove 112 of the pedicle screw body 10 at the vertebral body to be reset is not tightly fitted with the connecting rod 40, and the part of the connecting rod 40 at the vertebral body to be reset is roughly located above the limiting groove 112 or even in the extension piece 20. At this time, the top screw is screwed into the second connecting section 232 on the pedicle screw body 10 at the vertebral body to be reset and screwed with the second internal thread 321 to apply pressure to the connecting rod 40 in the direction close to the limiting groove 112. In the process of the top screw being gradually screwed in along the direction close to the limiting groove 112 and abutting against the connecting rod 40, since the rigid connecting rod 40 is difficult to fit with the limiting groove 112 at the vertebra to be reset, the supporting force provided by the rigid bracket formed by the connecting rod 40 and the pedicle screw body 10 on the other vertebrae and the force applied by the top screw to the connecting rod 40 can be used to enable the screw 12 at the vertebra to be reset to pull the vertebra to be reset. Therefore, this embodiment realizes the lifting and reset operation of the vertebra to be reset through the cooperation of the top screw and the second internal thread 321, and the reset operation is efficient and convenient.

[0071] Due to assembly tolerance, when the connecting rod 40 is fixed in the limiting groove 112 on the vertebral body near the vertebral body to be reset, the spiral line of the second internal thread 321 in the second connecting section 232 and the spiral line of the first internal thread 121 may not be able to merge, thereby preventing the top screw from entering the limiting groove 112 to achieve the locking operation of the connecting rod 40. To solve this problem, along the first direction, the length of the clamping groove 13 in this embodiment is greater than the length of the clamping protrusion 26. At this time, because the length of the clamping protrusion 26 along the first direction is less than the length of the clamping groove 13, the extension piece 20 can pull the second connecting section 232 to produce axial movement relative to the limiting groove 112 along the first direction, so that through the axial movement operation, the spiral lines of the first internal thread 121 and the second internal thread 321 can be adjusted to merge, ensuring that the top screw can smoothly enter the limiting groove 112 to perform the locking operation of the connecting rod 40. Therefore, in the process of screwing the top screw into the direction of the limiting groove 112, the position of the second connecting section 232 relative to the limiting groove 112 is adjusted along the first direction to merge the spiral line of the second internal thread 321 with the spiral line of the first internal thread 121, thereby ensuring that the top screw can be smoothly screwed from the second internal thread 321 section into the first internal thread 121 section.

[0072] like Fig.11As shown, in another preferred embodiment of the present embodiment, the second connecting section 232 includes a threaded section 322 and a light hole section 323. The threaded section 322 is located on a side of the second connecting section 232 close to the first connecting section 231, the light hole section 323 is located on a side of the second connecting section 232 close to the third connecting section 233, and the second internal thread 321 is located in the threaded section 322. Since the length of the light hole section 323 along the first direction is greater than the length of the top screw along the first direction, after the top screw enters the light hole section 323 from the threaded section 322 where the second internal thread 321 is located, the connecting rod 40 can be pressed into the limiting groove 112 by continuing to apply downward pressure toward the limiting groove 112 to the top screw, and there is no need to consider whether the spiral line of the second internal thread 321 and the thread line of the first internal thread 121 can be combined, so that the top screw can be screwed with the first internal thread 121 in the limiting groove 112 and the connecting rod 40 can be screwed into the limiting groove 112, and the operation is more convenient and quick. Furthermore, the second internal thread 321 in the threaded section 322 can be combined with a top screw to achieve a lifting and resetting function of the vertebral body to be relocated.

[0073] The second embodiment of the utility model is based on the above embodiment and combined with the attached Figures 1 to 11 , provides an application embodiment of a pedicle screw fixation device and a method for lifting and resetting a vertebral body using the pedicle screw fixation device.

[0074] The short-tail pedicle screw currently used in clinical practice is relatively complicated to perform vertebral lifting and reduction operations, and there are many supporting instrument parts. The instrument parts have a relatively complex combination of use during the operation, and the clinical acceptance is poor. At the same time, considering the position differences of the spinous process, lamina and corresponding joints of the patient's surgical site, it often causes the connecting rod 40 to be unable to connect with the pedicle screw. The existing special instruments have many parts and components, which also leads to the relatively large instruments, greatly prolonging the time of the surgical operation, increasing the patient's bleeding volume, and also presenting a very high challenge to the technical requirements of clinical users. Although the lifting pedicle screw is convenient and quick to place the rod, the connecting rod 40 can be pressed into the limit groove 112 by the top screw without the help of external force to achieve the lifting and reduction function of the vertebral body, but the processing cost is high, the material loss is large, and it is easy to cause tissue irritation.

[0075] It can be seen that the existing pedicle screws have a technical barrier that it is difficult to combine the advantages of short-tail pedicle screws and lifting pedicle screws. In this regard, the inventor of the utility model has found through in-depth research that if the short-tail pedicle screw can realize the rapid rod placement and rod pressing functions of the lifting pedicle screw, it is a research direction to solve this barrier. To this end, this embodiment designs a pedicle screw fixing device that can quickly realize lifting, resetting and rod placement, which can reduce the loss of raw materials and reduce manufacturing costs, while meeting the needs of different clinical surgical environments (such as minimally invasive and open surgical environments).

[0076] The pedicle screw fixing device in this embodiment includes a pedicle screw body 10, two extension components, a top screw and a connecting rod 40. The two extension components are arranged on the limiting groove 112 of the pedicle screw body 10 to increase the length of the screw sleeve 11 of the pedicle screw body 10. The top screw is placed into the limiting groove 112 along the installation channel formed by the two extension components to achieve the effect of lifting and resetting the diseased vertebra. Figure 8 As shown, since different extension components are separately detachable, the operation of laterally inserting the connecting rod 40 of the device has also achieved a qualitative leap.

[0077] In clinical surgery, due to sagittal dislocation of adjacent vertebrae, in order to restore the physiological curvature of the vertebrae, it is necessary to lift and reset the vertebrae to be reset that have lost their curvature. The conventional operation method is to place multiple pedicle screw bodies 10 along the pedicles on the adjacent vertebrae to be reset that have lost their physiological curvature, and to place the connecting rods into the limiting grooves 112 of the multiple pedicle screw bodies 10 through the top screws to form a rigid support structure. Then, a predetermined pedicle screw body 10 is placed on the vertebrae to be reset, and the top screw is screwed into the installation channel on the predetermined pedicle screw body 10 to abut against the connecting rod 40, and with the support force provided by the formed rigid support, the convex vertebra is pulled back to the original curvature position, thereby achieving lifting and reset.

[0078] In view of the above principles, in order to achieve the rapid placement of the connecting rod 40, the pedicle screw body 10 in this embodiment is preferably a short-tail pedicle screw, and then two independent and detachable extension pieces 20 are added to the short-tail pedicle screw. The two extension pieces 20 are placed on both sides of the short-tail pedicle screw sleeve 11 by using the connecting sleeve 30 (because the connecting sleeve 30 is provided with a slide groove 31 on both sides along the second direction, so that the cross section of the connecting sleeve 30 is approximately C-shaped). The extension piece 20 can be provided with a second internal thread 321 with a lifting and resetting function, and the same method as the lifting and resetting pedicle screw is used to cooperate with the second internal thread 321 with a top screw, and with the help of the nail rod rigid bracket on the nearby vertebral body, the lifting and resetting operation of the vertebral body to be reset is achieved. Among them, the extension piece 20 is provided with a clamping protrusion 26 at one end of the limiting portion 111 constituting the limiting groove 112, and the limiting portion 111 of the short-tail pedicle screw is provided with a clamping groove 13 adapted to the clamping protrusion 26. Since the extension piece 20 is provided with an escape groove 22 for dividing the connecting portion of the extension piece 20 into two connecting pieces 23, the clamping protrusion 26 can be provided on the connecting piece 23, so as to take advantage of the easy elastic deformation of the connecting piece 23, open the connecting piece 23 and quickly buckle the extension piece 20 on the short-tailed pedicle screw through the cooperation of the clamping protrusion 26 and the clamping groove 13. Then, the connecting sleeve 30 is used to stably fix the extension piece 20 on the short-tailed pedicle screw along the step of the slide rail 24 designed on the extension piece 20.

[0079] Because the second internal thread 321 of the extension piece 20 and the first internal thread 121 in the short-tail pedicle screw limiting groove 112 are two independent thread segments 322, in order to ensure that the second internal thread 321 and the first internal thread 121 can form an effective through thread, the length of the clamping protrusion 26 in the extension piece 20 along the first direction is greater than the length of the clamping groove 13 on the short-tail pedicle screw along the first direction, so that the extension piece 20 can axially move relative to the short-tail pedicle screw. The second internal thread 321 is adjusted to be able to merge and penetrate with the first internal thread 121 through the axial movement aperture, which can not only ensure that the top screw can enter the first internal thread 121 along the second internal thread 321 to tighten the connecting rod 40, but also can realize the lifting and resetting operation of the vertebral body to be reset through the cooperation between the second internal thread 321 and the top screw between the extension piece 20 on the short-tail pedicle screw to be reset.

[0080] During clinical use, after the short-tail pedicle screws are inserted into the vertebral body along the pedicles, the spatial angles of the multiple short-tail pedicle screws are different, which makes it impossible for the positions of the limiting grooves 112 on the multiple short-tail pedicle screws to be on the same plane, so that the limiting grooves 112 and the connecting rods 40 are misaligned with each other. In this regard, the present embodiment can remove one of the extension pieces 20 on the misaligned limiting groove 112, push the connecting rod 40 into the misaligned limiting groove 112 with the help of a rod pressing tool, and then install the extension piece 20 on the upper limiting groove 112, and finally realize the functions of rapid rod placement and lifting and reduction.

[0081] After the connecting rod 40 is connected to the limiting grooves 112 of multiple short-tail pedicle screws, the top screw is screwed into the extension piece 20 on the short-tail pedicle screw limiting grooves 112 on the vertebra to be reset, and the vertebra to be reset that loses its physiological curvature is reset by means of the rigid support structure composed of the short-tail pedicle screws and the connecting rod 40 on the nearby vertebra. After the vertebra to be reset is reset, the top screw at the vertebra to be reset is locked with a torque-limiting wrench, and the connecting sleeve 30 is pulled upward to make the extension piece 20 quickly separate from the short-tail pedicle screw, so as to realize the function of one-step locking and quick disassembly. After the extension piece 20 is disassembled and separated, there is no broken spike formed by the tail of the pedicle screw being pulled up in the short-tail pedicle screw, which largely avoids irritation and tingling between tissues and avoids postoperative inflammation in patients. Moreover, since the extension piece 20 and the connecting sleeve 30 can be used repeatedly, the use of raw materials and the cost of production and processing are reduced. The pedicle screw fixing device has a simple structure, is firm and stable, and the added extension piece 20 can be used for both open surgery and minimally invasive surgery, and can adapt to different surgical treatments.

[0082] This embodiment also provides a method for lifting and resetting a vertebral body using the pedicle screw fixation device, and the specific implementation of the method is as follows:

[0083] By conventional methods, the pedicle screw body 10 (such as short-tail pedicle screw) is inserted into the pedicle along its own axial direction to reach the vertebral body. On the implanted pedicle screw body 10, the extension piece 20 is slid down along the outer arc of the screw sleeve 11 and the symmetrical plane on the two limiting parts 111 and is buckled with the limiting part 111. Since the connecting piece 23 of the extension piece 20 is prone to elastic deformation, the clamping protrusion 26 is arranged on the connecting piece 23, so as to facilitate the fast docking of the clamping protrusion 26 on the extension piece 20 with the clamping groove 13 of the limiting part 111. At this time, the extension piece 20 has not yet formed an effective fixation with the limiting part 111, and the connecting piece 23 needs to be fixed by the connecting sleeve 30. When fixing, the sliding groove 31 of the connecting sleeve 30 is docked with the slide rail 24 on the extension piece 20 and slides to the stopper 25 in the direction close to the limiting part 111, and the two extension pieces 20 are placed in place by the same operation, so as to realize the efficient assembly between the extension piece 20 and the screw sleeve 11.

[0084] The starting position of the second internal thread 321 of the inner cavity of the extension piece 20 has been set during processing, and there is a play gap along the first direction between the protrusion 26 of the extension piece 20 and the groove 13 on the screw sleeve 11. The play gap length (such as Figure 5 The length indicated by the L part in the middle matches the pitch of the second internal thread 321. When the extension piece 20 is subsequently installed in the installation channel formed between the extension pieces 20 and the top screw is screwed in, the extension piece 20 is moved along the first direction, so that the first internal thread 121 on the screw sleeve 11 and the second internal thread 321 of the extension piece 20 can form a through thread, so that the top screw is screwed from the second internal thread 321 into the first internal thread 121 to achieve the pressing and locking function of the connecting rod 40. Later, the rigid support structure formed by the pedicle screw body 10 and the connecting rod 40 on the adjacent vertebral body can be used to achieve the lifting and reduction of the vertebra to be reduced through the cooperation of the top screw and the second internal thread 321.

[0085] During the open surgery, although the placement arc and angle of the connecting rod 40 can be planned in advance, there is often a rod placement space deviation when the connecting rod 40 is actually placed, resulting in the connecting rod 40 being unable to be positioned in the corresponding limiting groove 112. At that time, the connecting sleeve 30 of one of the extension pieces 20 on the limiting groove 112 is slid upward along the extension piece 20, and the extension piece 20 is gently lifted to quickly remove the extension piece 20. Then, a conventional rod pressing device is used to push the connecting rod 40 into the misplaced limiting groove 112, thereby realizing the lateral placement operation of the connecting rod 40 and saving surgical operation time.

[0086] The top screw is screwed into the installation channel between the two extension pieces 20 on the pedicle screw body 10 until the top screw contacts the arc surface on the connecting rod 40, and the top screw is continued to be tightened. The connecting rod 40 is slowly moved down to the bottom of the limiting groove 112 or the arc surface on the locking ring under the pressure of the top screw, and then the top screw is continued to be rotated. The rigid structure composed of the pedicle screw body 10 and the connecting rod 40 built on the vertebral body near the vertebral body to be reset is compared with the pulling force required for the reset of the vertebral body to be reset. When the pulling pressure is greater than the dislocation deformation force of the vertebral body to be reset, the vertebral body to be reset will be slowly pulled back until the vertebral body to be reset returns to its original normal position, thus completing the lifting and reset of the vertebral body to be reset.

[0087] Conventional tools are used to expand the upper and lower vertebrae near the vertebrae to be repositioned to normal curvature heights, the upper and lower vertebral end plates are processed, and an adapted fusion device is implanted. The fusion device is placed between adjacent vertebrae to restore the lost height of the vertebrae and achieve vertebral fusion. The rigid structure formed by the pedicle screw body 10 and the connecting rod 40 can help the fusion device achieve vertebral fusion.

[0088] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0089] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of this application.

[0090] The above are only preferred embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A pedicle screw fixation device, characterized in that: include: A pedicle screw body (10), the pedicle screw body (10) comprising a screw sleeve (11) and a screw (12), one end of the screw (12) along a first direction being connected to the inside of the screw sleeve (11), the screw sleeve (11) having at least two limiting portions (111) on a side away from the screw (12), the at least two limiting portions (111) being arranged at intervals along the circumference of the screw sleeve (11) to surround and form a limiting groove (112); an extension mechanism, the extension mechanism being detachably connected to at least two of the limiting portions (111), and the extension mechanism being provided with a mounting channel communicating with the limiting grooves (112) along a first direction; A locking piece, the locking piece is at least used to press the connecting rod (40) into the limiting groove (112) along the installation channel, and lock the connecting rod (40) in the limiting groove (112).

2. The pedicle screw fixation device according to claim 1, characterized in that: The extension mechanism comprises at least two extension components, the at least two extension components are detachably connected to at least two limit portions (111) in a one-to-one correspondence, and the installation channel is formed by surrounding the at least two extension components.

3. The pedicle screw fixation device according to claim 2, characterized in that: The extension component comprises: An extension piece (20), one end of the extension piece (20) along the first direction is detachably buckled with the limiting portion (111) via a buckling assembly.

4. The pedicle screw fixation device according to claim 3, characterized in that: The extension piece (20) comprises: A main body (21); A connecting portion, the connecting portion is located on one side of the main body (21) along a first direction, the connecting portion is provided with an avoidance groove (22), the avoidance groove (22) is recessed in a direction close to the main body (21) so as to divide the connecting portion into at least two connecting pieces (23), and the buckle assembly is arranged between the at least two connecting pieces (23) and the limiting portion (111).

5. The pedicle screw fixation device according to claim 4, characterized in that: The extension component also includes: A sleeve connection portion, the sleeve connection portion is connected to at least two of the connection pieces (23) and can be moved along a first direction to a position away from the connection pieces (23), and the sleeve connection portion is used to limit at least two of the connection pieces (23) to the limiting portion (111).

6. The pedicle screw fixation device according to claim 5, characterized in that: The sleeve portion comprises: A connecting sleeve (30), the connecting sleeve (30) is covered on at least two of the connecting sheets (23), and the connecting sleeve (30) is slidably connected to the extension sheet (20) via a sliding connection component along at least one side of the second direction.

7. The pedicle screw fixation device according to claim 6, characterized in that: The sliding connection assembly comprises: A slide rail (24), the slide rail (24) comprising at least two slide rails, the at least two slide rails (24) being respectively arranged on both sides of the extension piece (20) along the second direction; A slide groove (31), wherein the slide groove (31) is adapted to the slide rail (24), and the slide groove (31) comprises at least two slide grooves, wherein the at least two slide grooves (31) are respectively arranged on both sides of the connecting sleeve (30) along the second direction, and are arranged in a one-to-one correspondence with the at least two slide rails (24).

8. The pedicle screw fixation device according to any one of claims 5 to 7, characterized in that: A stopper (25) is provided on the surface of the extension piece (20) away from the axis of the screw sleeve (11); the stopper (25) is located on the side of the connecting portion away from the main body (21); and the sleeve connection portion abuts against the stopper (25).

9. The pedicle screw fixation device according to any one of claims 4 to 7, characterized in that: The buckle assembly comprises: A locking protrusion (26), wherein the locking protrusion (26) is arranged on one of the extension piece (20) and the limiting portion (111); A card slot (13), the card slot (13) is adapted to the card protrusion (26) and is arranged on the other of the extension piece (20) and the limiting portion (111).

10. The pedicle screw fixation device according to claim 9, characterized in that: The connecting portion comprises at least two connecting sections, at least one of the connecting sections is connected to the main body (21), at least one of the connecting sections is provided with a connecting groove (27) adapted to the limiting portion (111), the locking protrusion (26) is arranged in the connecting groove (27), and the locking groove (13) is arranged on the outer surface of the limiting portion (111) on one side close to the connecting portion.

11. The pedicle screw fixation device according to claim 10, characterized in that: The locking member comprises a top screw, the outer peripheral surface of the top screw is provided with an external thread, the limiting groove (112) is provided with a first internal thread (121) adapted to the external thread, and the connecting section comprises: A first connecting section (231), the first connecting section (231) being connected to the main body (21); a second connecting section (232), the second connecting section (232) being connected to an end of the first connecting section (231) away from the main body (21); a third connecting section (233), the third connecting section (233) being connected to an end of the second connecting section (232) away from the first connecting section (231), the connecting groove being arranged on the third connecting section (233); Wherein, a second internal thread (321) is provided in the second connecting section (232), and the second internal thread (321) extends from an end of the second connecting section (232) close to the first connecting section (231) to an end close to the third connecting section (233); And / or, along the first direction, the length of the locking groove (13) is greater than the length of the locking protrusion (26).

12. The pedicle screw fixation device according to claim 11, characterized in that: in, The second connecting section (232) comprises a threaded section (322) and a light hole section (323); the threaded section (322) is located on a side of the second connecting section (232) close to the first connecting section (231); the light hole section (323) is located on a side of the second connecting section (232) close to the third connecting section (233); the second internal thread (321) is located in the threaded section (322); and the length of the light hole section (323) along the first direction is greater than the length of the top screw along the first direction.

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