A pedicle screw assembly

Abstract

The application provides a pedicle screw assembly, which comprises a guide sleeve, a memory guide wire in the guide sleeve and a pedicle screw; one end of the guide sleeve is a fixed end matched with a spine positioning, and the other end is a force applying end; a front section of the memory guide wire is inserted into a bone channel; a middle section is Z-shaped; a rear section is provided with a scale; the pedicle screw comprises a screw seat and a screw body; the screw seat is located in the guide sleeve and can slide relative to the guide sleeve. In the scheme, the guide sleeve is used for positioning and guiding the screw seat to be placed, the screw body has an eccentric through hole for penetrating the memory guide wire, and a channel for penetrating the memory guide wire is arranged on the screw seat. The screw seat is placed along the guide sleeve, the screw body has the function of placing the hollow pedicle screw along the guide wire, the pedicle screw has a double placing function, the placing accuracy is high, the operation is simple, the strength and the fixing force of the solid pedicle screw are achieved, and the occurrence rate of broken screws is reduced.

Description

Technical Field

[0001] This invention patent relates to the field of orthopedic surgical medical devices, and in particular to a pedicle screw assembly. Background Technology

[0002] In spinal surgery, pedicle screw fixation, with its three-column fixation advantage, is a mature and widely used technique. The procedure is divided into open and minimally invasive surgery. Open surgery uses solid pedicle screws, offering strong fixation, good corrective effect, and low breakage rate. However, it is more invasive, involves more bleeding, has a higher complication rate, and slower recovery. Minimally invasive surgery is less invasive, involves less bleeding, has a lower complication rate, and faster recovery, and is now widely used clinically. Minimally invasive surgery uses hollow pedicle screws, which offer high accuracy in placement and are quick and easy to use. However, the hollow screw body results in weaker fixation, poorer corrective effect, and a higher risk of breakage. Because of their small size and weak fixation, hollow pedicle screws are extremely prone to breakage and cannot be manufactured or used. Therefore, percutaneous minimally invasive hollow pedicle screw fixation cannot be performed on the pedicles of the cervical and upper thoracic vertebrae in adults and the thoracic and lumbar vertebrae in children due to limited space. These disadvantages of hollow pedicle screws limit their application compared to solid pedicle screws, and they also have a higher rate of breakage. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of the prior art and provide a pedicle screw assembly.

[0004] This application provides a pedicle screw assembly, which includes: a pedicle screw assembly comprising: a guide sleeve, a memory guide wire located within the guide sleeve, and a pedicle screw; wherein, the guide sleeve is open at both ends, and one end of the guide sleeve is a fixing end that cooperates with the spinal positioning; the other end of the guide sleeve is a force-applying end;

[0005] The pedicle screw includes a base and a body; wherein...

[0006] The pin seat is located inside the guide sleeve and can slide relative to the guide sleeve;

[0007] The threaded section of the nail body is a solid structure, and the threaded section is exposed outside the nail seat; the nail head of the nail body is confined inside the nail seat;

[0008] The threaded section is provided with an eccentric through hole for passing through the memory guide wire at the end away from the nail head; the nail seat is provided with a channel for passing through the memory guide wire.

[0009] The memory guidewire includes an anterior section, a middle section, and a posterior section; wherein, the anterior section is a positioning section inserted into the pedicle screw channel, the middle section is Z-shaped and can pass through the eccentric through hole of the pedicle screw, and the posterior section is marked with graduations.

[0010] In one specific implementation, the channel is a through hole or notch provided on the nail seat.

[0011] In one specific implementation, the fixed end of the guide sleeve has a serrated structure;

[0012] The force-applying end of the guide sleeve is provided with a shoulder.

[0013] In one specific implementation, the threaded section of the nail body can swing and rotate relative to the nail seat; wherein the axis around which the nail body rotates is the axis of the nail body.

[0014] In one specific implementation, the eccentric through hole includes a channel with openings at both ends, the channel being straight; one end of the channel is located on the end face of the threaded segment away from the nail head; the axis of the channel is inclined relative to the axis of the threaded segment, and the other end of the channel is located on the side wall of the threaded segment, the inclined direction of the axis of the channel is towards the nail head.

[0015] In one specific implementation, the angle α between the axis of the eccentric through hole and the axis of the threaded segment, and the angle β between the taper line of the pedicle screw tip and the axis of the threaded segment, satisfy 0. 0 <α<β, and the difference between β and α is less than a set value.

[0016] In one specific implementation, the nail holder includes two oppositely arranged breakable arms, and support seats fixedly connected to each of the two breakable arms; wherein...

[0017] The breakable arm is provided with internal threads;

[0018] The threaded section of the nail passes through the support base; the channel is provided in the support base.

[0019] In one specific implementation, the breakable arm is provided with at least one recessed cut, and the internal thread crosses the recessed cut near the nail body.

[0020] In one specific implementation, a screw plug is also included, the outer surface of which is provided with an external thread that mates with the internal thread.

[0021] The beneficial effects of this invention are as follows: Positioning is achieved using a guide sleeve, and guidance is provided by a memory guide wire fixed relative to the guide sleeve. The threaded section of the corresponding pedicle screw is solid, with an eccentric through-hole for the memory guide wire only at its front end. The front opening of this eccentric through-hole is located at the front end of the pedicle screw, and the rear outlet is located on the side wall of the pedicle screw. Additionally, a channel for the memory guide wire is provided on the screw seat. When the pedicle screw is inserted through the guide wire, it is sequentially inserted into the eccentric through-hole and the channel. This ensures that the guide wire does not affect the sliding of the eccentric screw and screw seat within the guide sleeve. The pedicle screw is positioned along the guide sleeve and the memory guide wire, resulting in high placement accuracy and ease of operation. Furthermore, the solid rear section of the eccentric screw provides the advantages of strong fixation force, good orthopedic effect, reduced screw breakage rate, and ease of manufacturing and application. Therefore, the pedicle screw assembly inherits the advantages of solid pedicle screws, such as strong fixation force, good orthopedic effect, and low risk of breakage, as well as hollow pedicle screws, such as accurate placement and easy operation.

[0022] Because the outer surfaces of the two breakable arms of the pedicle screw assembly of the present invention have at least one concave notch, and the concave notch is relatively thin, the breakable arm can be broken at this point, and the length of the two breakable arms can be adjusted according to the thickness from the pedicle inlet to the skin.

[0023] Because the inner surfaces of the rear sections of the two breakable arms of the pedicle screw assembly of this invention are unthreaded guide sections, when the matching plug is inserted into the unthreaded guide section at the end of the U-shaped arm, the plug is coaxial with the two breakable arms of the pedicle screw, that is, it completely matches the threaded opening edge, allowing the plug to be screwed in smoothly and quickly. The guide section guides the plug, effectively preventing damage to the threads of the pedicle screw and the plug due to incorrect screwing direction.

[0024] The pedicle screw assembly of the present invention is easy to process, manufacture, and apply, enabling minimally invasive internal fixation. It provides accurate screw placement, simple and quick operation, strong fixation force, good orthopedic effect, reduces pedicle screw breakage and loosening, minimizes surgical trauma, reduces bleeding, and promotes rapid recovery, surpassing the effects of existing open and minimally invasive surgeries. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the pedicle screw assembly provided by the present invention;

[0026] Figure 2 This is an exploded view of the pedicle screw assembly provided by the present invention;

[0027] Figure 3 This is a schematic diagram of the structure of the guide sleeve provided by the present invention;

[0028] Figure 4This is an exploded view of the pedicle screw provided by the present invention;

[0029] Figure 5 This is a schematic diagram of the structure of the nail body provided by the present invention;

[0030] Figure 6 This is a schematic diagram of the structure of the memory guidewire provided by the present invention;

[0031] Figure 7 A schematic diagram of the expansion core provided by the present invention being inserted into human tissue;

[0032] Figure 8 A schematic diagram of the lotus root locator provided by the present invention being inserted into human tissue;

[0033] Figure 9 This is a schematic diagram of the guide tube provided by the present invention being inserted into human tissue;

[0034] Figure 10 This is a schematic diagram illustrating the fit between the tapping rod and the guide sleeve provided by the present invention.

[0035] Figure 11 This is a schematic diagram of the tapping rod after it has been withdrawn, as provided by the present invention.

[0036] Figure 12 This is a schematic diagram of the insertion of the pedicle screw into the guide sleeve provided by the present invention.

[0037] Figure 13 This is a schematic diagram of the insertion of the pedicle screw provided by the present invention into the human body;

[0038] Figure 14 This is a schematic diagram of the guide sleeve after removal provided by the present invention;

[0039] Label:

[0040] 100 - Guide sleeve, 110 - Force-applying end, 120 - Fixed end, 130 - Shoulder;

[0041] 200-Pedicle screw, 210-Screw seat, 211-Support seat, 212-Breakable arm, 213-Second concave notch, 214-First concave notch, 220-Screw body, 221-Threaded section, 222-Screw head, 230-Eccentric through hole, 231-End face opening, 232-Side wall outlet, 233-Channel, 240-Passage, 250-Plug;

[0042] 300 - Memory guidewire, 310 - Front section, 320 - Middle section, 330 - Back section, 331 - Scale;

[0043] 400 Kirschner wires;

[0044] 500-Expanded Core;

[0045] 600-Lotus stem positioner;

[0046] 700-Tapping rod. Detailed Implementation

[0047] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0048] To facilitate understanding of the pedicle screw assembly provided in this application embodiment, its application scenario is first described. The pedicle screw assembly provided in this application embodiment is used in spinal surgery to fix the spine using pedicle screws. However, in current pedicle screws, hollow pedicle screws lack sufficient strength, while solid pedicle screws have poor guidance and are difficult to position. Therefore, this application embodiment provides a pedicle screw assembly to increase the structural strength and guiding effect of the pedicle screw. A detailed description follows with reference to specific drawings and embodiments.

[0049] refer to Figure 1 and Figure 2 As shown, Figure 1 A schematic diagram of the pedicle screw assembly provided in an embodiment of this application is shown. Figure 2 An exploded view of the pedicle screw assembly provided in this embodiment is shown. The pedicle screw assembly provided in this embodiment mainly comprises three parts: a guide sleeve 100, a memory guide wire 300, and a pedicle screw 200. The guide sleeve 100 and the memory guide wire 300 are components that guide the pedicle screw 200. The pedicle screw 200 is used to fix the pedicle screw to the spine. In use, both the guide sleeve 100 and the memory guide wire 300 are fixed relative to the spine, with the memory guide wire 300 passing through and fixed relative to the guide sleeve 100. The pedicle screw 200 is slidably assembled in the guide sleeve 100, and the memory guide wire 300 passes through the pedicle screw 200. When guiding the pedicle screw 200, the memory guide wire 300 is first inserted into the pedicle screw 200, and then the pedicle screw 200 is inserted into the guide sleeve 100. The pedicle screw 200 is guided to the position that needs to be locked and fixed by the dual guidance of the guide sleeve 100 and the memory guide wire 300, so as to achieve alignment.

[0050] Please refer to the above. Figure 3 , Figure 3A schematic diagram of the guide sleeve 100 is shown. The guide sleeve 100 provided in this embodiment is an open-ended guide sleeve. One end of the guide sleeve 100 is a fixing end 120 that engages with the spine for positioning. When fixing the guide sleeve 100 to the spine, the fixing end 120 is hammered into position and fixed. The other end of the guide sleeve 100 is a force-applying end 110, which is the end where medical personnel apply force to the guide sleeve 100. In use, medical personnel can use a hammer or other tools to strike the force-applying end 110 of the guide sleeve 100 to fix it in place. It should be understood that the guide sleeve 100 is a cylindrical tube to facilitate the sliding of the pedicle screw 200 within the guide sleeve 100.

[0051] In one feasible embodiment, the fixed end 120 of the guide sleeve 100 has a serrated structure, such as... Figure 3 As shown, the fixing end 120 of the guide sleeve 100 has a serrated edge. When fixing the guide sleeve 100 to the spine, the tip of the serration can be inserted into the spine for fixation, thereby increasing the stability of the guide sleeve 100. In addition, the force-applying end 110 of the guide sleeve 100 is provided with a shoulder 130. The shoulder 130 consists of two plate-like structures arranged opposite each other. When fixing the guide sleeve 100, one shoulder 130 can be used to support the guide sleeve 100, and the other shoulder 130 can be tapped to facilitate the application of force and avoid the tool striking the opening of the guide sleeve 100, which could deform the opening of the guide sleeve 100 and affect the insertion of the pedicle screw 200.

[0052] The memory guide wire 300 provided in this application embodiment is a memory guide wire with memory and elasticity. The memory guide wire 300 is fixed on the spine. Specifically, when in use, the end of the memory guide wire 300 can be inserted into the opening position on the spine.

[0053] Please refer to the above. Figure 4 , Figure 4 An exploded view of the pedicle screw 200 provided in this embodiment is shown. The pedicle screw 200 provided in this embodiment comprises two parts: a screw seat 210 and a screw body 220. The screw seat 210 serves as a guide structure, cooperating with a guide sleeve 100 to allow the pedicle screw 200 to slide along the guide sleeve 100 to the desired position. (Reference) Figure 1 As shown, the nail seat 210 is located inside the guide sleeve 100 and can slide relative to the guide sleeve 100. During assembly, the nail seat 210 can be inserted into the guide sleeve 100 through the opening of the force application 110.

[0054] Continue to refer to Figure 4The nail body 220 provided in this embodiment includes a threaded section 221 and a nail head 222. The threaded section 221 has an external thread that engages with a threaded hole drilled in the spine for fixation. When engaged with the nail holder 210, the threaded section 221 of the nail body 220 is a solid structure and protrudes outside the nail holder 210. The nail head 222 of the nail body 220 is confined within the nail holder 210. The nail head 222 has a ball-shaped structure to ensure the nail body 220 engages with the nail holder 210 and prevents them from disengaging. Alternatively, the nail body 220 and the nail holder 210 can be designed as a single unit.

[0055] When used with the memory guide wire 300, the pedicle screw 200 provided in this embodiment has a structure that mates with the memory guide wire 300. Specifically, the threaded section 221, away from the head 222, has an eccentric through hole 230 for inserting the memory guide wire 300; the screw seat 210 has a channel 240 for inserting the memory guide wire 300. That is, when inserting the memory guide wire 300, the memory guide wire 300 first enters the eccentric through hole 230, and then enters the channel 240 of the screw seat 210. The entire guide wire does not extend beyond the periphery of the pedicle screw 200, so that when the pedicle screw 200 mates with the guide sleeve 100, the memory guide wire 300 will not affect the sliding of the pedicle screw 200, the gap between the pedicle screw 200 and the guide sleeve 100 can be smaller, and the guiding effect is better.

[0056] refer to Figure 6 As shown, Figure 6 A schematic diagram of the structure of the memory guidewire provided in an embodiment of this application is shown. The memory guidewire 300 includes a front section 310, a middle section 320, and a rear section 330; wherein, the front section 310 is a positioning section inserted into the pedicle screw 200, while the middle section 320 is Z-shaped and can pass through the eccentric through hole 230 of the pedicle screw 200; the rear section is marked with a scale 331.

[0057] Continue to refer to Figure 4 The channel 240 provided on the nail holder 210 can be a notch or a through hole. When a notch is used, the notch is formed on the side wall of the nail holder 210, and the memory guide wire 300 can be hidden in the notch. It should be understood that the notch is a straight notch, and its length direction is along the axis of the nail holder 210. When it is set as a through hole, the through hole is also a straight through hole, and the memory guide wire 300 can be inserted into the through hole. It should be understood that, regardless of which method is used, the channel 240 formed on the nail holder 210 can prevent the memory guide wire 300 from protruding beyond the outer surface of the nail holder 210, thereby ensuring the effect of the sliding engagement between the nail holder 210 and the guide sleeve 100.

[0058] It should be understood that when setting the notch and through hole, the notch and through hole are positioned to avoid the nail body 220 and close to the axis of the nail seat 210, so that when the memory guide wire 300 passes through the nail body 220 and enters the nail seat 210, it can be located inside the circumferential surface of the outer surface of the nail seat 210.

[0059] Continue to refer to Figure 5 As shown, the eccentric through-hole 230 includes a channel 233 with openings at both ends, and the channel 233 is straight. One end of the channel 233 is an end face opening 231, and the other end is a side outlet 232. The axis of the channel 233 is inclined relative to the axis of the threaded section 221, and the direction of the inclination of the axis of the channel 233 is towards the rivet head 222. The end face opening 231 of the channel 233 is located on the end face of the threaded section 221 away from the rivet head 222, and the end face opening 231 of the channel 233 is the insertion port when the memory guide wire 300 is inserted. The side wall outlet of the eccentric through-hole 230 is located on the side wall of the threaded section 221.

[0060] Please refer to the above. Figure 4 and Figure 5 As shown, Figure 5 A schematic diagram of the screw body is shown. The angle α between the axis of the eccentric through hole 230 and the axis of the threaded section 221 is shown, as is the angle β between the taper line of the eccentric pedicle screw 200 and the axis of the threaded section 221. The taper of the screw tip is a fixed value. Therefore, α and β should satisfy 0. 0 <α<β, and the difference between β and α is less than a set value, which can be between 1° and 10°. It should be understood that when α=0... 0 An eccentric through-hole extends through the entire screw body by 220, becoming a central through-hole. Currently, the hollow pedicle screw has an α=0. 0 When α=β, the eccentric through-hole 230 does not exist, and the existing solid pedicle screw has α=β. 0 <α<β, the angle value of α is between that of a hollow pedicle screw and a solid pedicle screw. 0 Within the range of ~β, the strength of the eccentric pedicle screw 200 is greater than that of the hollow pedicle screw and less than that of the solid pedicle screw. When the α value approaches the β value, the strength of the eccentric pedicle screw 200 is close to that of the solid pedicle screw, and the proportion of the eccentric through hole 230 in the threaded section 221 is minimized. The threaded section 221, far from the nail head 222, experiences the least force, while the part of the threaded section 221 near the nail head 222 experiences the greatest force and is also prone to breakage. It should also be understood that the angle α between the axis of the eccentric through hole 230 and the axis of the threaded section 221 is smaller, and the easier it is for the memory guide wire 300 to pass through the eccentric through hole 230 and the channel 240. When α=0, the eccentric through hole 230 is the most stable. 0The ordinary guide wire passes through the central through hole of the hollow pedicle screw. The closer α is to β, the larger the angle. The greater the resistance of the ordinary guide wire passing through the eccentric through hole 230 and channel 240. In addition, the key is that the larger the angle α between the guide wire extending from the end face opening 231 of the eccentric pedicle screw 200 and the axis of the threaded section 221, the more the rotating screw body 220 drives the guide wire to make non-coaxial selection in the pedicle bone canal, resulting in the loss of the pedicle bone canal and the bone threads within it. However, the memory guide wire 300 of this invention can make up for this defect.

[0061] In one feasible embodiment, the nail holder 210 includes two oppositely arranged breakable arms 212 and a support base 211 fixedly connected to each of the two breakable arms 212; wherein, the breakable arms 212 are provided with internal threads; and the threaded section 221 of the nail body 220 passes through the support base 211; a channel 240 is provided in the support base 211. In a specific configuration, the two breakable arms 212 are fixedly connected to the support base 211 oppositely and form a U-shaped structure (i.e., the nail holder 210 is a U-shaped structure), and a connecting rod can be embedded in the U-shaped structure.

[0062] In one feasible embodiment, the breakable arm 212 has at least one recessed groove, and the internal thread crosses the recessed groove near the nail body 220. Exemplarily, the outer surfaces of both breakable arms 212 have at least one recessed groove. Figure 4 There are two indentations, namely the first concave cut 214 and the second concave cut 213. The inner surface of the breakable arm 212 has internal threads and a smooth surface.

[0063] Specifically, the inner surfaces of the two breakable arms 212 have internal threads that cross the first concave notch 214 but not the second concave notch 213. Regardless of the number of concave notches on the percutaneous guided pedicle screw 200, there are no threads from the second concave notch 213 to the tail edge of the two breakable arms 212. The smooth section without threads on the inner surfaces of the two breakable arms 212 is collectively referred to as the guide section.

[0064] In one feasible solution, a screw plug 250 is also included, the outer surface of which is provided with an external thread that mates with the internal thread.

[0065] The plug 250 is used in conjunction with the aforementioned eccentric pedicle screw 200. The outer surface of the plug 250 has an external thread that matches the internal thread of the breakable arm 212. One end of the plug 250 has a locking cap hole. The inner diameter of the screw seat 210 is the same as the outer diameter of the plug 250. During operation, the plug 250 can be held and moved by inserting an operating rod into the locking cap hole. When the plug 250 is placed into the guide section, it is aligned with the central axis of the screw seat 210 and fully matches the thread opening edge, allowing it to be smoothly screwed in. In this embodiment, the plug 250 is used in conjunction with the aforementioned screw seat 210 for fixing the pedicle screw 200 and the connecting rod during spinal surgery.

[0066] Specifically, the memory guidewire 300 is a thin metal wire with memory and elasticity. After accurate pedicle positioning is achieved using a 2.0mm Kirschner wire 400, the expansion core 500 is inserted along the Kirschner wire 400 to widen the soft tissue of the incision. Then, the guide sleeve 100 is inserted along the expansion core 500, with the serrated tip of the guide sleeve 100 piercing the spinal bone. The expansion core 500 is then withdrawn, leaving the Kirschner wire 400 in the guide sleeve 100. A hollow tap is used to tap the pedicle bone tunnel along the Kirschner wire 400. After tapping, the hollow tap is withdrawn, but not completely, leaving the tap still in the pedicle bone tunnel. The Kirschner wire 400 is then removed. The memory guidewire 300 is then inserted through the hollow tap. When the middle section 320 of the memory guidewire 300 passes through the hollow tap and enters the pedicle bone tunnel, a feeling of emptiness is felt. The posterior segment 330 of the fixed memory guidewire 300 is removed, and the hollow tap is withdrawn. The anterior segment 310 and the middle segment 320 of the memory guidewire 300 remain within the pedicle bone tunnel. The memory guidewire 300 is inserted into the screw body 220 and the screw seat 210. The eccentric pedicle screw 200 slides in along the memory guidewire 300, and the tip of the screw body 220 enters the pedicle inlet. The guide sleeve 100 and the eccentric pedicle screw 200 are fixed. The memory guidewire 300 is then withdrawn. The 330 mark at the rear end is flush with the tail edge of the eccentric pedicle screw. The middle section 320 of the memory guide wire 300 is retracted into the eccentric through hole 230, and there is a feeling of emptiness. At this time, the front section 310 of the memory guide wire 300 located in the pedicle bone tunnel is coaxial with the threaded section 221 and plays a guiding role. Fix the tail end of the memory guide wire 300, rotate it 2-3 times, fix the pedicle screw 200, pull out the memory guide wire 300, and continue to screw the pedicle screw 200 into the pedicle and vertebral body.

[0067] The aforementioned connecting rod is a common type of connecting rod in the prior art, comprising a rod body and connectors located at both ends of the rod body. The rod body is cylindrical and can be embedded in the nail seat 210 to form a nail-rod fixing structure. The connecting rod can be cut to the required length or bent into the required arc according to actual needs. The screw plug 250 can be screwed into the two breakable arms 212 to press the connecting rod.

[0068] In practical use, such as operation Figure 7-14 As shown.

[0069] 1. Determine the surgical site and incision location on the patient, and make the minimally invasive incision.

[0070] 2. Insert the expansion core 500 along the incision, then insert a 2.0mm Kirschner wire 400 along the expansion core 500 to anchor the pedicle inlet for initial positioning. Figure 7 As shown.

[0071] 3. Under C-arm fluoroscopy, use a 600-type locator to insert the 400 Kirschner wire into the pedicle insertion point and adjust it to a suitable position for the procedure. Figure 8 As shown.

[0072] 4. Use the puncture vertebra to adjust the Kirschner wire 400 to match the angle with the pedicle, and fix the Kirschner wire 400.

[0073] 5. The expansion core 500 is inserted along the Kirschner wire 400 to widen the incision soft tissue. The guide sleeve 100 is inserted along the expansion core 500, with its serrated tip fixed to the vertebra. The expansion core 500 is then removed, and a hollow tapping rod 700 is used to tap along the Kirschner wire 400 towards the pedicle. Figure 9 and Figure 10 As shown;

[0074] 6. Retract the tap 700mm but not completely, pull out the Kirschner wire 400mm, replace it with the memory guide wire 300mm, then retract the tap 700mm. Insert the pedicle screw 200mm along the memory guide wire 300mm. Confirm the placement of the pedicle screw 200mm and fix it in place. Figure 11 , Figure 12 , Figure 13 and Figure 14 As shown;

[0075] 7. Repeat the operation until multiple sets of screws are inserted;

[0076] 8. Insert the guide rod along the spine and connect multiple screws, then use nuts to lock and fix one end of the guide rod to the connection with the screws;

[0077] 9. Use appropriate instruments to complete the treatment surgery, such as using bone grafting instruments to perform bone grafting on the vertebrae, or using distraction instruments to pry the screws and vertebrae to complete the distraction operation, and using nuts to lock and fix the guide rod and the connection of multiple screws.

[0078] 10. Break off the broken part of the guide plate at the tail of the screw and suture the cut.

[0079] As can be seen from the above description, the eccentric pedicle screw assembly provided in this application embodiment is positioned using a guide sleeve 100 and guided by a memory guide wire 300 fixed relative to the guide sleeve 100. The threaded section 221 of the corresponding pedicle screw 200 is a solid section, with an eccentric through hole 230 for passing the memory guide wire 300 only at the front end. The front opening of the eccentric through hole 230 is located at the front end of the pedicle screw 200, and the rear outlet of the eccentric through hole 230 is located on the side wall of the pedicle screw 200. In addition, a channel 240 for passing the memory guide wire 300 is provided on the screw seat 210. When the pedicle screw 200 is inserted through the memory guide wire 300, it is sequentially inserted into the eccentric through hole 230 and channel 240. This allows the eccentric screw 200 and screw seat 210 to slide within the guide sleeve 100 without being affected by the memory guide wire 300. The pedicle screw 200 is placed along the memory guide wire 300, resulting in high placement accuracy and simple operation. Furthermore, the middle and posterior sections of the eccentric screw are solid, combining the advantages of solid pedicle screws 200 (strong fixation, good orthopedic effect, reduced breakage rate, and ease of manufacturing and application) with those of hollow pedicle screws 200. Therefore, the pedicle screw assembly inherits the advantages of both solid pedicle screws 200 (strong fixation, good orthopedic effect, and low breakage rate) and hollow pedicle screws 200 (accurate placement and simple operation).

[0080] Since the outer surfaces of the two breakable arms 212 of the pedicle screw assembly of the present invention have at least one concave notch, and the concave notch is relatively thin, the breakable arm 212 can be broken at this point, and the length of the two breakable arms 212 can be adjusted according to the thickness from the pedicle inlet to the skin.

[0081] Because the inner surfaces of the rear sections of the two breakable arms 212 of the pedicle screw assembly of the present invention are unthreaded guide sections, when the matching plug 250 is inserted into the unthreaded guide section at the tail end of the U-shaped arm, the plug 250 can be coaxial with the two breakable arms 212 of the pedicle screw 200, that is, it completely matches the thread opening edge, allowing the plug 250 to be screwed in smoothly and quickly. The guide section guides the plug 250, effectively preventing damage to the threads of the pedicle screw 200 and the plug 250 due to incorrect screwing direction.

[0082] The pedicle screw assembly of this invention is easy to process, manufacture, and adapt for application. It is used for minimally invasive internal fixation, with accurate screw placement, simple and quick operation, strong fixation force, good orthopedic effect, reduced pedicle screw breakage and loosening, less surgical trauma, less bleeding, and faster recovery, exceeding the effects of existing open surgery and minimally invasive surgery.

[0083] The above are merely preferred embodiments of the invention and are not intended to limit the invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the invention should be included within the scope of protection of the invention.

Claims

1. A pedicle screw assembly, characterized in that, include: The guide sleeve, the memory guide wire located inside the guide sleeve, and the pedicle screw; wherein, the guide sleeve is open at both ends, and one end of the guide sleeve is a fixed end that cooperates with the spinal positioning; the other end of the guide sleeve is a force-applying end; The pedicle screw includes a base and a body; wherein... The pin seat is located inside the guide sleeve and can slide relative to the guide sleeve; The threaded section of the nail body is a solid structure, and the threaded section is exposed outside the nail seat; the nail head of the nail body is confined inside the nail seat; The threaded section is provided with an eccentric through hole for passing through the memory guide wire at the end away from the nail head; the nail seat is provided with a channel for passing through the memory guide wire. The memory guidewire includes an anterior section, a middle section, and a posterior section; wherein, the anterior section is a positioning section inserted into the pedicle screw channel, the middle section is Z-shaped and can pass through the eccentric through hole of the pedicle screw, and the posterior section is marked with graduations; The eccentric through hole includes a channel with openings at both ends, and the channel is straight. One end of the channel is located on the end face of the threaded segment away from the nail head. The axis of the channel is inclined relative to the axis of the threaded segment, and the other end of the channel is located on the side wall of the threaded segment. The inclined direction of the axis of the channel is towards the nail head. The angle α between the axis of the eccentric through hole and the axis of the threaded segment, and the angle β between the taper line of the pedicle screw tip and the axis of the threaded segment, satisfy 0° < α < β, and the difference between β and α is less than 10°.

2. The pedicle screw assembly according to claim 1, characterized in that, The channel is a through hole or notch provided on the nail seat.

3. The pedicle screw assembly according to claim 2, characterized in that, The fixed end of the guide sleeve has a serrated structure; The force-applying end of the guide sleeve is provided with a shoulder.

4. The pedicle screw assembly according to claim 2, characterized in that, The threaded section of the nail body can swing and rotate relative to the nail seat; wherein the axis around which the nail body rotates is the axis of the nail body.

5. The pedicle screw assembly according to claim 1, characterized in that, The nail holder includes two oppositely arranged breakable arms, and support bases fixedly connected to the two breakable arms respectively; wherein, The breakable arm is provided with internal threads; The threaded section of the nail passes through the support base; the channel is provided in the support base.

6. The pedicle screw assembly according to claim 5, characterized in that, The breakable arm has at least one recessed cut, and the internal thread crosses the recessed cut near the nail body.

7. The pedicle screw assembly according to claim 6, characterized in that, It also includes a screw plug, the outer surface of which is provided with an external thread that mates with the internal thread.

Images