Lumbar surgery nerve root traction fixing device

Abstract

The utility model relates to a lumbar surgery nerve root traction fixing device which comprises a fixing part, an angle adjusting part, a connecting frame and a drag hook, the fixing part is used for being fixed to a spine vertebral body, the angle adjusting part is fixedly connected with the fixing part, and the drag hook is connected to the angle adjusting part through the connecting frame; the angle adjusting part comprises a connecting block, a rotating sleeve, a locking part and an elastic piece, and the connecting block is fixedly connected with the fixing part. When the rotating sleeve is locked on the connecting block, downward pressure is applied to the locking part, after the locking part slides downwards by a certain distance, the locking part can unlock the rotating sleeve and withdraw the pressure on the locking part, and the locking part can lock the rotating sleeve on the connecting block again by pushing and pressing the locking part upwards through the elastic piece. The rotating sleeve can be conveniently locked on the connecting block, the locking of the connecting block can be conveniently released, and the traction angle of the nerve root can be conveniently adjusted.

Description

Technical Field

[0001] The utility model relates to the technical field of medical auxiliary equipment, in particular to a nerve root traction and fixation device for lumbar surgery. Background Art

[0002] In lumbar spine surgery, such as lumbar disc herniation resection, in order to more clearly expose the lumbar intervertebral disc, the nerve roots need to be retracted and fixed. A nerve root retraction and fixation device is required for retracting and fixing the nerve roots.

[0003] A Chinese patent (publication number: CN219089429U) discloses a fixable and adjustable nerve root retractor, which is essentially a nerve root traction and fixation device, including a fixing assembly, an adjustment assembly, and a retractor. The retractor is fixed by screwing a screw into the spinal vertebra to form a fixed base, and the adjustment assembly is connected to the fixed retractor to achieve fixation. Compared with handheld methods, it is less likely to slip or dislodge. The adjustment assembly with a ball joint allows the position and angle of the nerve root retractor to be adjusted, eliminating the need for re-insertion and fixation, facilitating adjustments to the position and angle of the nerve root retraction point during surgery.

[0004] In the above-mentioned utility model solution, when the nerve root traction angle needs to be adjusted during the operation, the locking pin must be loosened with a screwdriver first. After adjusting the nerve root traction angle, the locking pin needs to be tightened again with a screwdriver to lock the ball joint. One adjustment requires at least two times of using a screwdriver to loosen and tighten the locking pin, which is still inconvenient when adjusting the nerve root traction angle. Utility Model Content

[0005] In view of this, the purpose of the present invention is to provide a nerve root traction and fixation device for lumbar spine surgery to solve the problem that the existing technology is still inconvenient when adjusting the traction angle of the nerve root.

[0006] The utility model is achieved through the following technical solutions:

[0007] A nerve root traction and fixation device for lumbar surgery includes a fixing part, an angle adjustment part, a connecting frame and a retractor, wherein the fixing part is used to be fixed on a spinal vertebra, the angle adjustment part is fixedly connected to the fixing part, and the connecting frame connects the retractor to the angle adjustment part; the angle adjustment part includes a connecting block, a rotating sleeve, a locking part and an elastic member, the connecting block is fixedly connected to the fixing part, an accommodating cavity is formed in the connecting block, the rotating sleeve is rotatably mounted on the connecting block in a horizontal direction, the locking part can be slid up and down in the accommodating cavity, the elastic member is located in the accommodating cavity, and the elastic member is used to push the locking part upward so that the locking part locks the rotating sleeve on the connecting block.

[0008] It is further defined that the rotating sleeve includes a cylinder, a first limiting ring, and a second limiting ring, the first limiting ring is formed by protruding inward from the upper end of the inner circumference of the cylinder, and the second limiting ring is formed by protruding inward from the lower end of the inner circumference of the cylinder; the connecting block is rotatably fitted in the cylinder, and the upper and lower end surfaces of the connecting block respectively abut against the first limiting ring and the second limiting ring.

[0009] It is further defined that the upper end surface of the connecting block is recessed downward at a position corresponding to the inner hole of the first limiting ring to form a through hole, and the lower end of the through hole is connected to the accommodating cavity.

[0010] It is further defined that the first limiting ring is formed with a plurality of first insertion holes, the plurality of first insertion holes are evenly arranged around the inner hole of the first limiting ring in a circumferential direction, the upper end surface of the connecting block is recessed downwardly at a position corresponding to one of the first insertion holes to form a second insertion hole, the second insertion hole has the same diameter as the first insertion hole, and the lower end of the second insertion hole is connected to the accommodating cavity;

[0011] The locking portion includes a sliding plate and an insertion rod. The sliding plate is slidably fitted in the accommodating cavity in a manner that it can slide up and down. The lower end of the insertion rod is fixed to the sliding plate at a position corresponding to the second insertion hole, and the upper end of the insertion rod is located in the second insertion hole and cooperates with the second insertion hole. The elastic member is used to push the sliding plate upward so that the upper end of the insertion rod is inserted into the first insertion hole through the second insertion hole.

[0012] It is further defined that the locking portion also includes a pressure block, which protrudes upward from the upper end surface of the sliding plate at a position corresponding to the through hole, and the upper end of the pressure block passes through the through hole and the inner hole of the first limiting ring in sequence and is located above the first limiting ring.

[0013] It is further defined that the connecting frame includes a telescopic rod and a vertical rod, the first end of the telescopic rod is fixedly connected to the rotating sleeve, the telescopic rod can be extended and shortened in the horizontal direction, the upper end of the vertical rod is fixedly connected to the second end of the telescopic rod, and the pull hook is fixedly connected to the lower end of the vertical rod.

[0014] It is further defined that the telescopic rod includes a screw, a connecting tube, a movable rod, an internal threaded ring and a guide rod, the first end of the screw is fixedly connected to the rotating sleeve, the end surface of the second end of the screw is recessed inward to form a guide channel, the cross-section of the guide channel is non-circular, the connecting tube can be slidably mounted on the screw, the connecting tube and the screw are arranged coaxially, the movable rod is fixedly connected to the end of the connecting tube facing away from the rotating sleeve, the internal threaded ring is screwed on the screw, and the internal threaded ring is rotatably connected to the end of the connecting tube facing the rotating sleeve, one end of the guide rod is fixedly connected to the movable rod, and the other end is located in the guide channel, and the guide rod cooperates with the guide channel; the upper end of the vertical rod is fixedly connected to the movable rod.

[0015] It is further defined that the outer circumferential surface of one end of the connecting tube facing the rotating sleeve is recessed inward to form an annular groove; the telescopic rod also includes a rotating ring and a connecting ring, the rotating ring rotatably fits in the annular groove, the connecting ring is arranged around the screw, one end of the connecting ring is fixedly connected to the rotating ring, and the other end is fixedly connected to the internal threaded ring.

[0016] It is further defined that the fixing part includes a fixing rod, a first threaded sleeve, a second threaded sleeve, an adjustment plate and a screw, the upper end of the fixing rod passes through the inner hole of the second limiting ring and is fixedly connected to the connecting block, the lower end of the fixing rod is fixedly connected to the first threaded sleeve, the outer wall of the first threaded sleeve is provided with an external thread, the second threaded sleeve is threadedly connected to the outer side of the first threaded sleeve, the adjustment plate is fixed to the lower end of the inner circumference of the second threaded sleeve, the middle part of the adjustment plate is provided with a screw hole, and the screw is threadedly connected to the screw hole.

[0017] The beneficial effects of the present invention are:

[0018] When using the present invention's nerve root traction and fixation device for lumbar spine surgery, downward pressure is applied to the locking portion, causing it to slide downward a certain distance. The locking portion then releases the lock on the rotating sleeve. By removing the pressure on the locking portion and pushing the locking portion upward via the elastic member, the locking portion relocks the rotating sleeve to the connecting block. This makes it easier to lock and unlock the rotating sleeve, and even more convenient to adjust the nerve root traction angle.

[0019] Other advantages, objectives, and features of the present invention will be described in detail in the following description and, to some extent, will be apparent to those skilled in the art upon examination and study of the following or may be learned from practice of the present invention. The objectives and other advantages of the present invention may be realized and obtained through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural diagram of the utility model;

[0021] Figure 2 It is a schematic diagram of the structure of the utility model after partial section;

[0022] Figure 3 for Figure 2 A in the middle is an enlarged schematic diagram;

[0023] Figure 4 for Figure 2 Enlarged schematic diagram of point B in the middle.

[0024] In the figure: 1. fixing part; 2. angle adjustment part; 3. connecting frame; 4. draw hook; 5. connecting block; 6. accommodating chamber; 7. rotating sleeve; 8. locking part; 9. elastic member; 10. cylinder; 11. first limiting ring; 12. second limiting ring; 13. through hole; 14. first insertion hole; 15. second insertion hole; 16. sliding plate; 17. insertion rod; 18. pressing block; 19. telescopic rod; 20. vertical rod; 21. screw; 22. connecting cylinder; 23. moving rod; 24. internal threaded ring; 25. guide rod; 26. guide channel; 27. annular groove; 28. rotating ring; 29. ​​connecting ring; 30. fixing rod; 31. first threaded sleeve; 32. second threaded sleeve; 33. adjusting plate; 34. screw; DETAILED DESCRIPTION

[0025] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0026] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort are also within the scope of protection of the present invention.

[0027] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0028] In the above description of the present invention, it should be noted that the terms "one side" and "the other side" and the like indicate positions or locations based on the positions or locations shown in the accompanying drawings, or the positions or locations in which the product of the present invention is typically placed when in use. These terms are intended solely to facilitate the description of the present invention and simplify the description, and are not intended to indicate or imply that the device or component referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" and the like are used solely for distinction and should not be construed as indicating or implying relative importance.

[0029] Furthermore, the term "identical" and similar terms do not necessarily require that the components be absolutely identical; slight variations are permitted. The term "perpendicular" simply refers to the positional relationship between components being more perpendicular than "parallel," not that the structure must be perfectly vertical; rather, it can be slightly tilted.

[0030] See also Figures 1-4 The utility model provides a technical solution: a nerve root traction and fixation device for lumbar surgery, comprising a fixing part 1, an angle adjustment part 2, a connecting frame 3 and a retractor 4, wherein the fixing part 1 is used to be fixed on the vertebral body of the spine, the angle adjustment part 2 is fixedly connected to the fixing part 1, and the connecting frame 3 connects the retractor 4 to the angle adjustment part 2; the angle adjustment part 2 comprises a connecting block 5, a rotating sleeve 7, a locking part 8 and an elastic member 9, the connecting block 5 is fixedly connected to the fixing part 1, the connecting block 5 has an accommodating cavity 6 formed therein, the rotating sleeve 7 is rotatably mounted on the connecting block 5 in the horizontal direction, the locking part 8 can be slidably placed in the accommodating cavity 6 up and down, the elastic member 9 is located in the accommodating cavity 6, the elastic member 9 can be a coil spring, and the elastic member 9 is used to push the locking part 8 upward so that the locking part 8 locks the rotating sleeve 7 on the connecting block 5.

[0031] When the nerve root traction and fixation device for lumbar vertebra surgery according to the present invention is in an initial state, the elastic member 9 pushes the locking portion 8 upward, and the locking portion 8 locks the rotating sleeve 7 on the connecting block 5 .

[0032] When using the lumbar vertebra surgery nerve root pulling and fixing device of the present invention, by fixing the fixing part 1 on the spinal vertebral body, a stable foundation can be provided for the entire lumbar vertebra surgery nerve root pulling and fixing device, and the nerve root can be pulled and fixed by the retractor 4.

[0033] When the angle of the nerve root's pulling point needs to be adjusted, downward pressure is applied to the locking portion 8, causing it to slide downward and compress the elastic member 9. After the locking portion 8 slides downward a certain distance, it releases the lock on the rotating sleeve 7. At this point, the rotating sleeve 7 can rotate relative to the connecting block 5. At this time, the rotating sleeve 7 can be rotated horizontally, thereby driving the connecting frame 3 and the retractor 4 to rotate, thus completing the adjustment of the angle of the nerve root's pulling point. After the adjustment is completed, the pressure on the locking portion 8 is released, and the elastic member 9 elastically resets and pushes the locking portion 8 upward, so that the locking portion 8 re-locks the rotating sleeve 7 to the connecting block 5.

[0034] In this structure, downward pressure is applied to the locking portion 8, causing it to slide downward a certain distance, whereupon the locking portion 8 can release the lock on the rotating sleeve 7. By removing the pressure on the locking portion 8 and pushing the locking portion 8 upward via the elastic member 9, the locking portion 8 can relock the rotating sleeve 7 to the connecting block 5. This makes it easier to lock the rotating sleeve 7 to the connecting block 5 and to release the lock on the connecting block 5, and is even more convenient for adjusting the pulling angle of the nerve root.

[0035] In this embodiment, the rotating sleeve 7 includes a cylinder 10, a first limiting ring 11, and a second limiting ring 12. The first limiting ring 11 is formed by protruding inward from the upper end of the inner circumference of the cylinder 10, and the second limiting ring 12 is formed by protruding inward from the lower end of the inner circumference of the cylinder 10; the connecting block 5 is rotatably fitted in the cylinder 10, and the upper and lower end surfaces of the connecting block 5 respectively abut against the first limiting ring 11 and the second limiting ring 12.

[0036] Since the connecting block 5 is rotatably fitted in the cylinder 10, the upper and lower end faces of the connecting block 5 respectively abut against the first limiting ring 11 and the second limiting ring 12, and the rotating sleeve 7 can be rotatably mounted on the connecting block 5 in the horizontal direction, and the rotating sleeve 7 cannot move downward relative to the connecting block 5.

[0037] In this embodiment, the upper end surface of the connecting block 5 is recessed downward to form a through hole 13 at a position corresponding to the inner hole of the first limiting ring 11 , and the lower end of the through hole 13 is connected to the accommodating cavity 6 .

[0038] By passing a finger or other object downward through the inner hole of the first limiting ring 11 and the through hole 13 in sequence, downward pressure can be applied to the locking portion 8, which makes it more convenient to press the locking portion 8 downward.

[0039] In this embodiment, a plurality of first insertion holes 14 are formed on the first limiting ring 11. The plurality of first insertion holes 14 are evenly arranged around the inner hole of the first limiting ring 11 along the circumferential direction. A second insertion hole 15 is formed on the upper end surface of the connecting block 5 at a position corresponding to one of the first insertion holes 14. The second insertion hole 15 has the same diameter as the first insertion hole 14, and the lower end of the second insertion hole 15 is connected to the accommodating cavity 6.

[0040] The locking portion 8 includes a sliding plate 16 and an insertion rod 17. The sliding plate 16 is slidably fitted in the accommodating cavity 6 in a manner that allows it to slide up and down. The lower end of the insertion rod 17 is fixed to the sliding plate 16 at a position corresponding to the second insertion hole 15. The upper end of the insertion rod 17 is located in the second insertion hole 15 and cooperates with the second insertion hole 15. The elastic member 9 is used to push the sliding plate 16 upward so that the upper end of the insertion rod 17 is inserted into the first insertion hole 14 through the second insertion hole 15.

[0041] In the initial state, under the pushing action of the elastic member 9, the upper end of the insertion rod 17 is inserted into the first insertion hole 14 through the second insertion hole 15. At this time, the insertion rod 17 locks the first limiting ring 11 on the connecting block 5, and the first limiting ring 11 cannot rotate on the connecting block 5. The combined structure of the cylinder 10, the first limiting ring 11 and the second limiting ring 12 is in a state of being locked on the connecting block 5, that is, the rotating sleeve 7 is in a state of being locked on the connecting block 5, and the rotating sleeve 7 cannot rotate on the connecting block 5.

[0042] When it is necessary to release the lock of the locking portion 8 on the rotating sleeve 7, downward pressure is applied to the sliding plate 16, the sliding plate 16 slides downward and compresses the elastic member 9, and the sliding plate 16 drives the insertion rod 17 to move downward synchronously, so that the upper end of the insertion rod 17 moves from the first insertion hole 14 to the second insertion hole 15. At this time, the insertion rod 17 is disengaged from the first limiting ring 11, and the first limiting ring 11 can rotate on the connecting block 5. The locking portion 8 can release the lock on the rotating sleeve 7, and the rotating sleeve 7 can rotate relative to the connecting block 5.

[0043] The rotating sleeve 7 is rotated on the connecting block 5. After the rotating sleeve 7 rotates a certain angle, the other first insertion hole 14 can be aligned with the second insertion hole 15. The pressure on the sliding plate 16 is released, and the elastic member 9 elastically resets to push the sliding plate 16 upward, and simultaneously pushes the insertion rod 17 upward, so that the upper end of the insertion rod 17 is inserted into the first insertion hole 14 aligned with the second insertion hole 15. At this time, the insertion rod 17 relocks the first limiting ring 11 on the connecting block 5, and the first limiting ring 11 cannot rotate on the connecting block 5. The locking portion 8 can thus relock the rotating sleeve 7 on the connecting block 5.

[0044] In this embodiment, the locking portion 8 also includes a pressure block 18, which protrudes upward from the upper end surface of the sliding plate 16 at a position corresponding to the through hole 13. The upper end of the pressure block 18 passes through the through hole 13 and the inner hole of the first limiting ring 11 in sequence and is located above the first limiting ring 11.

[0045] The pressing block 18 protrudes upward and is located above the first limiting ring 11. The upper end of the pressing block 18 is exposed. By pressing the upper end of the pressing block 18 downward, pressure can be applied to the sliding plate 16, which is more convenient when pressing the locking portion 8 downward.

[0046] In this embodiment, the connecting frame 3 includes a telescopic rod 19 and a vertical rod 20. The first end of the telescopic rod 19 is fixedly connected to the rotating sleeve 7. The telescopic rod 19 can be extended and shortened in the horizontal direction. The upper end of the vertical rod 20 is fixedly connected to the second end of the telescopic rod 19, and the pull hook 4 is fixedly connected to the lower end of the vertical rod 20.

[0047] In this structure, by extending or shortening the telescopic rod 19 in the horizontal direction, the vertical rod 20 and the distance between the retractor 4 and the rotating sleeve 7 are adjusted, so that the pulling position of the retractor 4 on the nerve root can be adjusted more flexibly.

[0048] In this embodiment, the telescopic rod 19 includes a screw 21, a connecting tube 22, a moving rod 23, an internal threaded ring 24 and a guide rod 25. The first end of the screw 21 is fixedly connected to the rotating sleeve 7, and the end surface of the second end of the screw 21 is recessed inward to form a guide channel 26. The cross-section of the guide channel 26 is non-circular. The connecting tube 22 is slidably mounted on the screw 21. The connecting tube 22 and the screw 21 are coaxially arranged. The moving rod 23 is fixedly connected to the end of the connecting tube 22 facing away from the rotating sleeve 7. The internal threaded ring 24 is screwed on the screw 21. The internal threaded ring 24 is rotatably connected to the end of the connecting tube 22 facing the rotating sleeve 7. One end of the guide rod 25 is fixedly connected to the moving rod 23, and the other end is located in the guide channel 26. The guide rod 25 cooperates with the guide channel 26; the upper end of the vertical rod 20 is fixedly connected to the moving rod 23.

[0049] The cross-sections of the guide channel 26 and the guide rod 25 are both non-circular. The guide rod 25 cooperates with the guide channel 26 so that the guide rod 25 can only move horizontally in the guide channel 26, and the guide rod 25 cannot rotate in the guide channel 26, thereby making the moving rod 23 and the connecting tube 22 only able to move horizontally relative to the screw rod 21, and making the moving rod 23 and the connecting tube 22 unable to rotate relative to the screw rod 21.

[0050] By rotating the internal threaded ring 24 on the screw 21, the internal threaded ring 24 moves toward or away from the rotating sleeve 7 on the screw 21. The internal threaded ring 24 can drive the connecting tube 22, the moving rod 23 and the guide rod 25 to move toward or away from the rotating sleeve 7. With this structure, the telescopic rod 19 can be extended and shortened in the horizontal direction.

[0051] In this embodiment, the outer circumferential surface of the end of the connecting tube 22 facing the rotating sleeve 7 is recessed inward to form an annular groove 27; the telescopic rod 19 also includes a rotating ring 28 and a connecting ring 29, the rotating ring 28 rotatably fits in the annular groove 27, and the connecting ring 29 is arranged around the screw rod 21, one end of the connecting ring 29 is fixedly connected to the rotating ring 28, and the other end is fixedly connected to the internal threaded ring 24.

[0052] With this structure, the internal thread ring 24 can be rotatably connected to the end of the connecting tube 22 facing the rotating sleeve 7 , and the internal thread ring 24 will not be separated from the connecting tube 22 .

[0053] In this embodiment, the fixing part 1 includes a fixing rod 30, a first threaded sleeve 31, a second threaded sleeve 32, an adjustment plate 33 and a screw 34. The upper end of the fixing rod 30 passes through the inner hole of the second limiting ring 12 and is fixedly connected to the connecting block 5. The lower end of the fixing rod 30 is fixedly connected to the first threaded sleeve 31. The outer wall of the first threaded sleeve 31 is provided with an external thread. The second threaded sleeve 32 is screwed to the outer side of the first threaded sleeve 31. The adjustment plate 33 is fixed to the lower end of the inner circumference of the second threaded sleeve 32. A screw hole is provided in the middle of the adjustment plate 33, and the screw 34 is threadedly connected to the screw hole.

[0054] When fixing the fixing portion 1 to the spinal vertebra, the lower end of the screw 34 is threadedly connected to the screw hole so that the lower end of the screw 34 is located below the adjustment plate 33, and the screw 34 is screwed into the spinal vertebra using a screwdriver. The fixing rod 30 is held in the hand, so that the axis of the first threaded sleeve 31 and the axis of the second threaded sleeve 32 are relative to each other in the vertical direction, and the second threaded sleeve 32 is rotated to move the second threaded sleeve 32 upward on the screw 34. While the second threaded sleeve 32 moves upward, it rotates relative to the first threaded sleeve 31, thereby being threadedly connected to the outside of the first threaded sleeve 31. In this way, the lumbar surgery nerve root traction and fixation device of the present invention can be connected to the spinal vertebra through the fixing portion 1.

[0055] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model and are not limiting. Although the utility model is described in detail with reference to the preferred embodiments, ordinary technicians in this field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution of the utility model, which should be included in the scope of the claims of the utility model.

Claims

1. A nerve root traction and fixation device for lumbar spine surgery, characterized by: The invention comprises a fixing part (1), an angle adjustment part (2), a connecting frame (3) and a retractor (4), wherein the fixing part (1) is used to be fixed on a spinal vertebra, the angle adjustment part (2) is fixedly connected to the fixing part (1), and the connecting frame (3) connects the retractor (4) to the angle adjustment part (2); the angle adjustment part (2) comprises a connecting block (5), a rotating sleeve (7), a locking part (8) and an elastic member (9), wherein the connecting block (5) is fixedly connected to the fixing part (1), an accommodating cavity (6) is formed in the connecting block (5), the rotating sleeve (7) is sleeved on the connecting block (5) in a manner that it can rotate in a horizontal direction, the locking part (8) can be slidably placed in the accommodating cavity (6) up and down, and the elastic member (9) is located in the accommodating cavity (6), and the elastic member (9) is used to push the locking part (8) upward so that the locking part (8) locks the rotating sleeve (7) on the connecting block (5).

2. The nerve root traction and fixation device for lumbar spine surgery according to claim 1, characterized in that: The rotating sleeve (7) includes a cylinder (10), a first limiting ring (11), and a second limiting ring (12). The first limiting ring (11) is formed by protruding inward from the upper end of the inner circumference of the cylinder (10), and the second limiting ring (12) is formed by protruding inward from the lower end of the inner circumference of the cylinder (10); the connecting block (5) is rotatably fitted in the cylinder (10), and the upper and lower end surfaces of the connecting block (5) respectively abut against the first limiting ring (11) and the second limiting ring (12).

3. The nerve root traction and fixation device for lumbar spine surgery according to claim 2, characterized in that: The upper end surface of the connecting block (5) is recessed downward at a position corresponding to the inner hole of the first limiting ring (11) to form a through hole (13), and the lower end of the through hole (13) is connected to the accommodating cavity (6).

4. The nerve root traction and fixation device for lumbar spine surgery according to claim 3, characterized in that: A plurality of first insertion holes (14) are formed on the first limiting ring (11), and the plurality of first insertion holes (14) are evenly arranged around the inner hole of the first limiting ring (11) along the circumferential direction. The upper end surface of the connecting block (5) is recessed downward at a position corresponding to one of the first insertion holes (14) to form a second insertion hole (15). The second insertion hole (15) has the same diameter as the first insertion hole (14), and the lower end of the second insertion hole (15) is connected to the accommodating cavity (6); The locking portion (8) includes a sliding plate (16) and an insertion rod (17), wherein the sliding plate (16) is slidably fitted in the accommodating cavity (6) in an up-and-down sliding manner, the lower end of the insertion rod (17) is fixed on the sliding plate (16) at a position corresponding to the second insertion hole (15), and the upper end of the insertion rod (17) is located in the second insertion hole (15) and fits with the second insertion hole (15); the elastic member (9) is used to push the sliding plate (16) upward so that the upper end of the insertion rod (17) is inserted into the first insertion hole (14) through the second insertion hole (15).

5. The nerve root traction and fixation device for lumbar spine surgery according to claim 4, characterized in that: The locking portion (8) further includes a pressing block (18), which is formed by protruding upward from the upper end surface of the sliding plate (16) at a position corresponding to the through hole (13), and the upper end of the pressing block (18) passes through the through hole (13) and the inner hole of the first limiting ring (11) in sequence and is located above the first limiting ring (11).

6. The nerve root traction and fixation device for lumbar spine surgery according to claim 1, characterized in that: The connecting frame (3) includes a telescopic rod (19) and a vertical rod (20), the first end of the telescopic rod (19) is fixedly connected to the rotating sleeve (7), the telescopic rod (19) can be extended and shortened in the horizontal direction, the upper end of the vertical rod (20) is fixedly connected to the second end of the telescopic rod (19), and the draw hook (4) is fixedly connected to the lower end of the vertical rod (20).

7. The nerve root traction and fixation device for lumbar spine surgery according to claim 6, characterized in that: The telescopic rod (19) comprises a screw (21), a connecting tube (22), a moving rod (23), an internal threaded ring (24) and a guide rod (25). The first end of the screw (21) is fixedly connected to the rotating sleeve (7). The end surface of the second end of the screw (21) is recessed inward to form a guide channel (26). The cross section of the guide channel (26) is non-circular. The connecting tube (22) is slidably sleeved on the screw (21). The connecting tube (22) and the screw (21) are coaxially arranged. The moving rod (25) is fixedly connected to the rotating sleeve (7). The second end of the screw (21) is recessed inward to form a guide channel (26). The cross section of the guide channel (26) is non-circular. 3) The end of the connecting tube (22) facing away from the rotating sleeve (7) is fixedly connected, the internal threaded ring (24) is screwed onto the screw rod (21), the internal threaded ring (24) is rotatably connected to the end of the connecting tube (22) facing the rotating sleeve (7), one end of the guide rod (25) is fixedly connected to the moving rod (23), and the other end is located in the guide channel (26), and the guide rod (25) cooperates with the guide channel (26); the upper end of the vertical rod (20) is fixedly connected to the moving rod (23).

8. The nerve root traction and fixation device for lumbar spine surgery according to claim 7, characterized in that: The outer circumference of one end of the connecting tube (22) facing the rotating sleeve (7) is recessed inward to form an annular groove (27); the telescopic rod (19) further comprises a rotating ring (28) and a connecting ring (29), the rotating ring (28) being rotatably engaged in the annular groove (27), the connecting ring (29) being arranged around the screw rod (21), one end of the connecting ring (29) being fixedly connected to the rotating ring (28), and the other end being fixedly connected to the internal threaded ring (24).

9. The nerve root traction and fixation device for lumbar spine surgery according to claim 2, characterized in that: The fixing portion (1) comprises a fixing rod (30), a first threaded sleeve (31), a second threaded sleeve (32), an adjusting plate (33) and a screw (34); the upper end of the fixing rod (30) passes through the inner hole of the second limiting ring (12) and is fixedly connected to the connecting block (5); the lower end of the fixing rod (30) is fixedly connected to the first threaded sleeve (31); the outer wall of the first threaded sleeve (31) is provided with an external thread; the second threaded sleeve (32) is screwed to the outer side of the first threaded sleeve (31); the adjusting plate (33) is fixed to the lower end of the inner circumference of the second threaded sleeve (32); a screw hole is provided in the middle of the adjusting plate (33); the screw (34) is screwed into the screw hole.

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