Device for treating isthmus

Abstract

The invention provides a device for treating isthmus fissure, the device for treating isthmus fissure comprises two vertebral pedicle screws, a suture, a plug screw and a tightener, the two vertebral pedicle screws are respectively implanted into vertebral pedicles on two sides of a patient, the suture is arranged between the two vertebral pedicle screws, two ends of the suture are respectively connected with the two vertebral pedicle screws, and the plug screw is connected with the tightener. The plug screw is detachably arranged on the pedicle screw and used for pressing the suture, and the tightener is used for adjusting the tension of the suture. According to the device for treating the isthmus fissure, certain elasticity can be reserved while enough fixing strength is provided, the suture tension can be accurately adjusted through the tightener to achieve personalized adaptation, and therefore the risk of complications is reduced, and the postoperative rehabilitation quality is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of orthopedic surgical instruments, and in particular to a device for treating spondylolysis. Background Art

[0002] Spondylolysis is a common structural spinal lesion, often occurring in the lumbar region, often caused by trauma or congenital factors. Currently, the most common clinical treatment involves rigid fixation with pedicle screws and connecting rods to achieve stable healing of the fracture ends.

[0003] In related technologies, rigid internal fixation systems have certain risks and limitations during postoperative recovery. For example, the rigid structure lacks physiological elastic buffering and is prone to stress concentration. Before bone fusion is completed, excessive rigidity may cause pedicle screws to loosen, break, or connectors to fall out. The fixation strength cannot be adjusted and cannot meet the personalized needs of different patients. Summary of the Invention

[0004] The present invention provides a device for treating spondylolysis, which can achieve a stable fixation effect, is used to solve the complications caused by traditional rigid fixation, and improve the quality of postoperative rehabilitation.

[0005] An embodiment of the present invention discloses a device for treating spondylolysis, comprising: Two pedicle screws are implanted into the pedicles on both sides of the patient; A suture is provided between the two pedicle screws, and both ends of the suture are connected to the two pedicle screws respectively; a screw plug, detachably disposed on the pedicle screw, for compressing the suture; A tightener is used to adjust the tension of the suture.

[0006] In some embodiments, the pedicle screw comprises: A nail head, wherein the surface of the nail head is provided with threads so as to be implanted into the pedicle; A nail tail, one end of which is connected to the nail head, and the other end of which is provided with a U-shaped groove, wherein the suture is passed through the U-shaped groove.

[0007] In some embodiments, the screw plug includes a first threaded portion and a stop portion, and a second threaded portion is provided on the inner circumference of the U-shaped groove. The first threaded portion is threadedly connected to the second threaded portion so that the stop portion presses the suture against the bottom wall of the U-shaped groove.

[0008] In some embodiments, the suture includes a plurality of sub-threads, and the plurality of sub-threads are intertwined to form the suture.

[0009] In some embodiments, the tightener comprises: A body having a head end and a tail end in its extension direction; A handle assembly, the handle assembly being arranged at the end of the body, the handle assembly comprising a fixed handle and a movable handle, the fixed handle being fixedly connected to the body, and the movable handle being rotatable relative to the body; A docking head, the docking head being arranged at the head end of the body and having an inner cavity so as to be sleeved on the outer peripheral side of the pedicle screw; A tightening assembly is movably arranged on the machine body. The position of the tightening assembly can be adjusted by rotating the movable handle. The tightening assembly is used to wind and tighten the suture.

[0010] In some embodiments, the tightener comprises: The transmission assembly is connected to the movable handle and the tightening assembly. The transmission assembly is used to convert the rotation of the movable handle into the movement of the tightening assembly.

[0011] In some embodiments, the movable handle comprises: a connecting portion rotatably connected to the body; a connecting rod component and an intermediate portion, wherein the connecting rod component is rotatably connected to the intermediate portion and the connecting rod component is fixedly connected to the transmission assembly; The gripping portion, wherein the intermediate portion is arranged between the connecting portion and the gripping portion.

[0012] In some embodiments, the transmission assembly includes a transmission column and a connecting piece, and the movable handle, the transmission column, the connecting piece and the tightening assembly are connected in sequence.

[0013] In some embodiments, the tightening assembly comprises: a base plate connected to the transmission assembly; two guide posts arranged on the bottom plate at intervals; The winding column is arranged between the two guide columns, and the dimension between the two guide columns gradually increases along the direction from the head end of the body to the tail end of the body.

[0014] In some embodiments, the transmission assembly includes: The locking member has a locking position and a releasing position. In the locking position, the locking member is engaged with the transmission assembly to limit the movement of the transmission assembly. In the releasing position, the locking member is separated from the transmission assembly.

[0015] The device for treating spondylolysis in an embodiment of the present invention can retain a certain degree of elasticity while providing sufficient fixation strength, and can accurately adjust the suture tension through a tightener to achieve personalized adaptation, thereby reducing the risk of complications and improving the quality of postoperative rehabilitation. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the present invention or the prior art, a brief introduction is given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0017] Figure 1 This is a schematic diagram of the use status of the device for treating spondylolysis provided by the present invention.

[0018] Figure 2 It is a schematic structural diagram of the device for treating spondylolysis provided by the present invention.

[0019] Figure 3 This is a schematic diagram of the device for treating spondylolysis provided by the present invention with the tensioner removed.

[0020] Figure 4 It is a structural schematic diagram of a wire tightener of the device for treating spondylolysis provided by the present invention.

[0021] Figure 5 It is a schematic structural diagram of the transmission assembly and handle assembly of the device for treating spondylolysis provided by the present invention.

[0022] Figure 6 It is a schematic structural diagram of the tightening component of the device for treating spondylolysis provided by the present invention.

[0023] Figure 7 It is a schematic structural diagram of the connecting rod component of the device for treating spondylolysis provided by the present invention.

[0024] Reference numerals: 100. Device for treating spondylolysis; 1. Pedicle screw; 11. Screw head; 12. Screw tail; 121. U-shaped groove; 2. Suture; 3. Screw plug; 4. Tightener; 41. Body; 42. Handle assembly; 421. Fixed handle; 422. Movable handle; 4221. Connecting portion; 4222. Connecting rod component; 42221. First connecting rod; 42222. Second connecting rod; 4223. Intermediate portion; 4224. Grip portion; 43. Docking joint; 431. Roller; 44. Tightening assembly; 441. Bottom plate; 442. Guide column; 443. Winding column; 45. Transmission assembly; 451. Transmission column; 452. Connecting piece; 453. Locking piece; 454. Elastic piece. DETAILED DESCRIPTION

[0025] To make the objectives, technical solutions, and advantages of the present invention more clear, the technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0026] like Figures 1 to 7 As shown, the device 100 for treating spondylolysis according to an embodiment of the present invention includes two pedicle screws 1 , a suture 2 , a screw plug 3 and a tightener 4 .

[0027] Two pedicle screws 1 are respectively implanted into the pedicles on both sides of the patient.

[0028] The suture 2 is arranged between the two pedicle screws 1 , and both ends of the suture 2 are connected to the two pedicle screws 1 respectively.

[0029] The screw plug 3 is detachably arranged on the pedicle screw 1 , and is used to compress the suture 2 .

[0030] The tightener 4 is used to adjust the tension of the suture 2 .

[0031] Two pedicle screws 1 are implanted in the patient's pedicles on either side, ensuring a secure fixation point. A suture 2 is placed between the two screws 1, with its ends connected to each screw 1, forming a complete fixation structure. A screw plug 3 is removably attached to each screw 1. Rotating the screw plug 3 compresses the suture 2, ensuring proper tension and position.

[0032] In addition, the device 100 for treating spondylolysis according to an embodiment of the present invention is further equipped with a specially designed tightener 4 for precisely adjusting the tension of the suture 2. The tightener 4 can flexibly adjust the tightness of the suture 2 to achieve the best reduction effect. After the tension is finally determined, the suture 2 is fixed by the screw plug 3, thereby achieving stable and reliable elastic fixation.

[0033] In related technologies, rigid internal fixation systems have certain risks and limitations during postoperative recovery. For example, the rigid structure lacks physiological elastic buffering and is prone to stress concentration. Before bone fusion is completed, excessive rigidity may cause the pedicle screw 1 to loosen, break, or the connector 452 to fall out. The fixation strength cannot be adjusted and cannot meet the personalized needs of different patients.

[0034] In contrast, the device 100 for treating isthmic spondylolysis according to an embodiment of the present invention not only provides sufficient fixation strength to meet the stability requirements of the lesion site during and in the early postoperative period, but also replaces the traditional rigid connector 452 with sutures 2, retaining a certain degree of elasticity, making the fixation system closer to the natural biomechanical properties of the human body.

[0035] This fixation method helps alleviate stress concentration, reducing the risk of pedicle screw 1 fracture or dislodgement, and allows patients adequate physical space during recovery, thereby promoting bone healing and functional recovery. Furthermore, combined with the accompanying tightener 4 design, the surgeon can flexibly adjust the tension of the suture 2 according to individual patients, further enhancing the personalized adaptability of the surgical procedure, ultimately effectively improving the quality of postoperative recovery and reducing the risk of complications.

[0036] Therefore, the device 100 for treating spondylolysis in an embodiment of the present invention can retain a certain degree of elasticity while providing sufficient fixation strength, and can accurately adjust the tension of the suture 2 through the tightener 4 to achieve personalized adaptation, thereby reducing the risk of complications and improving the quality of postoperative recovery.

[0037] In some embodiments, the pedicle screw 1 includes a screw head 11 and a screw tail 12 . The surface of the screw head 11 is provided with threads for implantation into the pedicle.

[0038] One end of the nail tail 12 is connected to the nail head 11 , and the other end of the nail tail 12 is provided with a U-shaped groove 121 , and the suture 2 is passed through the U-shaped groove 121 .

[0039] The surface of the nail head 11 is provided with a thread so that it can be firmly implanted in the pedicle, ensuring the firmness of the fixing point. One end of the nail tail 12 is connected to the nail head 11, and the other end is provided with a U-shaped groove 121, and the suture 2 is passed through the U-shaped groove 121. This design not only facilitates the installation and fixation of the suture 2, but also enables the suture 2 to remain stable in the U-shaped groove 121, avoiding slippage or displacement during the operation. In addition, the design of the U-shaped groove 121 also provides convenience for adjusting the tension of the suture 2 during the operation, ensuring that the doctor can accurately control the tightness of the suture 2, thereby achieving the best reduction effect and fixation reliability. Through this structural design, the present invention effectively combines the advantages of high-strength fixation and flexible adjustment, further improving the treatment effect and the convenience of surgical operation.

[0040] In some embodiments, the screw plug 3 includes a first threaded portion and a stop portion, and a second threaded portion is provided on the inner circumference of the U-shaped groove 121. The first threaded portion is threadedly connected to the second threaded portion so that the stop portion presses the suture 2 against the bottom wall of the U-shaped groove 121.

[0041] The inner circumference of the U-shaped groove 121 is provided with a second threaded portion. When the screw plug 3 is screwed into the U-shaped groove 121, its first threaded portion and the second threaded portion are tightly matched through a threaded connection, ensuring that the screw plug 3 can be firmly fixed in a predetermined position. As the screw plug 3 is gradually tightened, the stop portion will apply pressure to the inside of the U-shaped groove 121, firmly pressing the suture 2 passing through the U-shaped groove 121 against the bottom wall of the U-shaped groove 121. This design not only ensures the stability and reliability of the suture 2 during the operation, but also allows the doctor to accurately adjust the tension of the suture 2 according to actual needs, thereby achieving the best reduction effect and fixation reliability. In addition, through this precise threaded connection method, the present invention effectively prevents the problem of loosening or displacement of the suture 2 due to external forces, further improving the safety and stability of the device 100 for treating spondylolysis.

[0042] In some embodiments, the suture 2 includes a plurality of sub-threads, which are twisted together to form the suture 2 .

[0043] Each sub-wire can be made of a high-strength, high-toughness material (such as ultra-high molecular weight polyethylene) to ensure that it has sufficient tensile strength and biocompatibility so that it will not break or trigger an immune response when implanted in the body for a long time.

[0044] In the device 100 for treating spondylolysis according to an embodiment of the present invention, these sub-threads are intertwined to form an integral suture 2. This design not only enhances the overall strength and durability of the suture 2, but also improves its stability and reliability during surgery.

[0045] In some embodiments, the tightener 4 includes a body 41 , a handle assembly 42 , a docking head 43 and a tightening assembly 44 . The body 41 has a head end and a tail end in its extending direction.

[0046] The handle assembly 42 is provided at the end of the body 41 . The handle assembly 42 includes a fixed handle 421 and a movable handle 422 . The fixed handle 421 is fixedly connected to the body 41 , and the movable handle 422 can rotate relative to the body 41 .

[0047] The butt joint 43 is provided at the head end of the body 41 , and is provided with an inner cavity so as to be sleeved on the outer peripheral side of the pedicle screw 1 .

[0048] The tightening assembly 44 is movably provided on the machine body 41 . The position of the tightening assembly 44 can be adjusted by rotating the movable handle 422 . The tightening assembly 44 is used to wind and tighten the suture 2 .

[0049] The tightener 4 includes a body 41 , a handle assembly 42 , a docking head 43 and a tightening assembly 44 , wherein the body 41 has a head end and a tail end in its extending direction.

[0050] The handle assembly 42 is provided at the end of the body 41 and includes a fixed handle 421 and a movable handle 422 . The fixed handle 421 is firmly connected to the body 41 , while the movable handle 422 can rotate relative to the body 41 to facilitate the operator to apply torque.

[0051] The docking head 43 is located at the head end of the body 41 and is designed with an inner cavity so that it can be sleeved on the outer peripheral side of the pedicle screw 1, ensuring that the device 100 for treating isthmic spondylosis maintains a stable and accurate position during use.

[0052] The tightening assembly 44 is movably mounted on the machine body 41 and has the function of winding and tightening the suture 2. The movable handle 422 is operated to drive the tightening assembly 44 to move along the machine body 41, thereby gradually increasing the tension of the suture 2 until the desired reduction effect is achieved.

[0053] The device 100 for treating spondylolysis according to an embodiment of the present invention is designed to not only enable the doctor to accurately control the tension of the suture 2 during surgery, but also to flexibly adjust it according to the patient's specific conditions, thereby ensuring the best treatment effect and fixation reliability.

[0054] In some embodiments, the tightener 4 includes a transmission assembly 45 , and the movable handle 422 and the tightening assembly 44 are both connected to the transmission assembly 45 . The transmission assembly 45 is used to convert the rotation of the movable handle 422 into the movement of the tightening assembly 44 .

[0055] When the operator rotates the movable handle 422 in the handle assembly 42, the rotational motion of the movable handle 422 is converted into translational motion of the tightening assembly 44 along the extension direction of the body 41 via the transmission assembly 45. This conversion mechanism ensures that each rotation is precisely transmitted to the tightening assembly 44, allowing the suture 2 to be tensioned evenly and stably. The design of the transmission assembly 45 not only improves the operating precision and controllability of the device, but also allows the physician to fine-tune the tension of the suture 2 according to actual needs, achieving optimal reduction and secure fixation.

[0056] In some embodiments, the movable handle 422 includes a connecting portion 4221, a connecting rod component 4222, an intermediate portion 4223, and a grip portion 4224. The connecting portion 4221 is rotatably connected to the body 41. The connecting rod component 4222 is rotatably connected to the intermediate portion 4223. The connecting rod component 4222 is fixedly connected to the transmission assembly 45. The intermediate portion 4223 is disposed between the connecting portion 4221 and the grip portion 4224.

[0057] The connecting portion 4221 is rotatably connected to the body 41 so that the movable handle 422 can rotate around a fixed point.

[0058] One end of the connecting rod component 4222 is hingedly connected to the middle part 4223, allowing a certain relative movement between the two, while the other end of the connecting rod component 4222 is fixedly connected to the transmission assembly 45 to ensure that any rotational movement generated by the movable handle 422 can be directly transmitted to the transmission assembly 45.

[0059] The middle portion 4223 is located between the connecting portion 4221 and the gripping portion 4224 , and acts as a bridge, thereby enhancing the structural stability of the entire movable handle 422 .

[0060] When a doctor applies force to grip portion 4224, this force is converted into rotational motion by connecting rod component 4222 and transmitted to transmission assembly 45 via connecting portion 4221. Due to the fixed connection between connecting rod component 4222 and transmission assembly 45, this rotational motion is converted into linear movement of tightening assembly 44, thereby achieving precise tightening of suture 2. The device 100 for treating spondylolysis according to the present invention not only improves operational flexibility and accuracy, but also significantly enhances its overall reliability and ease of use, allowing doctors to more efficiently and accurately adjust the tension of suture 2 during surgery, thereby optimizing the patient's treatment effect.

[0061] In some embodiments, the transmission assembly 45 includes a transmission column 451 and a connector 452 , and the movable handle 422 , the transmission column 451 , the connector 452 and the tightening assembly 44 are sequentially connected.

[0062] The middle portion 4223 is hingedly connected to the connecting portion 4221 , the transmission column 451 is fixedly connected to the connecting portion 4221 , the transmission column 451 is fixedly connected to the connecting member 452 , and the connecting member 452 is fixedly connected to the tightening assembly 44 .

[0063] The transmission column 451 is movably disposed within the body 41 along the extension direction of the body 41. The physician grasps and rotates the movable handle 422 in the handle assembly 42, causing the connecting portion 4221 to rotate about its connection point with the body 41. This rotational motion is transmitted to the transmission column 451 via the connecting rod 4222, causing the transmission column 451 to translate along a predetermined path within the body 41. As the transmission column 451 moves, the connecting member 452 connected thereto also moves, converting this movement into linear motion of the tightening assembly 44. Ultimately, the tightening assembly 44 winds and tightens the suture 2, achieving the desired tension adjustment effect.

[0064] Optionally, the connecting rod component 4222 includes a first connecting rod 42221 and a second connecting rod 42222, the middle part 4223, the first connecting rod 42221, the second connecting rod 42222 and the transmission column 451 are connected in sequence, the middle part 4223 is hinged to the first connecting rod 42221, the first connecting rod 42221 is hinged to the second connecting rod 42222, and the second connecting rod 42222 is fixedly connected to the transmission column 451.

[0065] In other embodiments, the transmission assembly 45 includes an elastic member 454, which has a force that causes the transmission column 451 to move toward the head end of the body 41. The elastic member 454 is mounted on the transmission column 451, with one end of the elastic member 454 abutting against the body 41, and the other end of the elastic member 454 abutting against the connecting rod component 4222. When the transmission column 451 is subjected to the force transmitted by the movable handle 422 and moves toward the end of the body 41, the elastic member 454 is compressed and stores energy, causing the tightening assembly 44 to move backward to tighten the suture 2. Once the movable handle 422 is released, the elastic member 454 releases the stored energy, generating a reverse force that causes the transmission column 451 to move toward the head end of the body 41, thereby causing the tightening assembly 44 to release the suture 2.

[0066] In some embodiments, the tightening assembly 44 includes a base plate 441, two guide posts 442, and a winding post 443. The base plate 441 is connected to the transmission assembly 45. The two guide posts 442 are spaced apart on the base plate 441. The winding post 443 is disposed between the two guide posts 442, and the distance between the two guide posts 442 gradually increases from the front end of the body 41 to the rear end of the body 41.

[0067] The bottom plate 441 is fixedly connected to the connecting member 452 to ensure that when the transmission assembly 45 moves, the bottom plate 441 can move synchronously, thereby driving the entire tightening assembly 44 to operate.

[0068] Two guide posts 442 are spaced apart on the bottom plate 441 to form a winding gap. The size of the winding gap gradually increases from the head end of the body 41 to the tail end of the body 41. The winding gap has a head section and a tail section in the extension direction of the body 41. The head section of the winding gap is arranged adjacent to the head end of the body 41, and the winding post 443 is arranged at the tail section of the winding gap.

[0069] The suture 2 enters from the first section of the winding gap, passes through the gap between a guide post 442 and a winding post 443, then wraps around the winding post 443 and turns back, passes through the gap between another guide post 442 and the winding post 443, and finally extends from the first section of the winding gap.

[0070] During use, the suture 2 first enters the winding slit through the first section. It then passes through the gap between one of the guide pins 442 and the winding pin 443, wraps around the winding pin 443, and after completing one or more turns, returns to the gap between the other guide pin 442 and the winding pin 443, finally exiting the winding slit through the first section. Because the first section is thin, it exerts a certain clamping force on the suture 2, preventing it from slipping or shifting.

[0071] The device 100 for treating isthmic spondylolysis according to an embodiment of the present invention has a structural design that not only realizes a reasonable layout of the suture 2 path, but also plays a role in preliminarily fixing the suture 2 through the thinner gap in the first section, further enhancing the device's ability to control the suture 2 during the tightening process, ensuring that the doctor can adjust the tension more stably and accurately, thereby improving the safety and reliability of the surgical operation.

[0072] In some embodiments, the transmission assembly 45 includes a locking member 453, which has a locking position and a release position. In the locking position, the locking member 453 is engaged with the transmission assembly 45 to limit the movement of the transmission assembly 45. In the release position, the locking member 453 is separated from the transmission assembly 45.

[0073] In the locked position, the locking member 453 engages the transmission post 451, thereby limiting the movement of the transmission assembly 45 and ensuring that the suture 2 remains fixed after reaching the desired tension, preventing loosening or displacement caused by external forces. In the released position, the locking member 453 is separated from the transmission assembly 45, allowing the transmission assembly 45 to move freely so that the surgeon can adjust the tension of the suture 2 according to surgical needs.

[0074] Furthermore, the transmission assembly 45 is equipped with a locking spring that exerts a force that urges the locking member 453 from the locked position to the released position. Specifically, when the operator wishes to release the lock, they can manually operate (e.g., rotate the locking member 453) to release the locking member 453 from the engagement with the transmission assembly 45, thereby shifting the locking member 453 to the released position under the action of the locking spring. To shift the lock to the released position, the locking member 453 is manipulated to overcome the force of the locking spring, thereby shifting the locking member 453 to the released position.

[0075] Optionally, racks are provided on both the locking member 453 and the transmission column 451 , and the locking member 453 and the transmission column 451 are locked by meshing of the two racks.

[0076] Optionally, a roller 431 is provided on the docking joint 43 so that the docking joint 43 is connected to the screw tail 12 of the pedicle screw 1 .

[0077] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A device for treating spondylolysis, characterized in that: include: Two pedicle screws are implanted into the pedicles on both sides of the patient; A suture is provided between the two pedicle screws, and both ends of the suture are connected to the two pedicle screws respectively; a screw plug, detachably disposed on the pedicle screw, for compressing the suture; A tightener is used to adjust the tension of the suture.

2. The device for treating spondylolysis according to claim 1, characterized in that: The pedicle screw comprises: A nail head, wherein the surface of the nail head is provided with threads so as to be implanted into the pedicle; A nail tail, one end of which is connected to the nail head, and the other end of which is provided with a U-shaped groove, wherein the suture is passed through the U-shaped groove.

3. The device for treating spondylolysis according to claim 2, characterized in that: The screw plug includes a first threaded portion and a stop portion. A second threaded portion is provided on the inner circumference of the U-shaped groove. The first threaded portion is threadably connected to the second threaded portion so that the stop portion presses the suture against the bottom wall of the U-shaped groove.

4. The device for treating spondylolysis according to claim 1, characterized in that: The suture includes a plurality of sub-threads, and the plurality of sub-threads are twisted together to form the suture.

5. The device for treating spondylolysis according to claim 1, characterized in that: The tightener comprises: A body having a head end and a tail end in its extension direction; A handle assembly, the handle assembly being arranged at the end of the body, the handle assembly comprising a fixed handle and a movable handle, the fixed handle being fixedly connected to the body, and the movable handle being rotatable relative to the body; A docking head, the docking head being arranged at the head end of the body and having an inner cavity so as to be sleeved on the outer peripheral side of the pedicle screw; A tightening assembly is movably arranged on the machine body. The position of the tightening assembly can be adjusted by rotating the movable handle. The tightening assembly is used to wind and tighten the suture.

6. The device for treating spondylolysis according to claim 5, characterized in that: The tightener comprises: The transmission assembly is connected to the movable handle and the tightening assembly. The transmission assembly is used to convert the rotation of the movable handle into the movement of the tightening assembly.

7. The device for treating spondylolysis according to claim 6, characterized in that: The movable handle comprises: a connecting portion rotatably connected to the body; a connecting rod component and an intermediate portion, wherein the connecting rod component is rotatably connected to the intermediate portion and the connecting rod component is fixedly connected to the transmission assembly; The gripping portion, wherein the intermediate portion is arranged between the connecting portion and the gripping portion.

8. The device for treating spondylolysis according to claim 6, characterized in that: The transmission assembly includes a transmission column and a connecting piece. The movable handle, the transmission column, the connecting piece and the tightening assembly are connected in sequence.

9. The device for treating spondylolysis according to claim 6, characterized in that: The tightening assembly comprises: a base plate connected to the transmission assembly; two guide posts arranged on the bottom plate at intervals; The winding column is arranged between the two guide columns, and the dimension between the two guide columns gradually increases along the direction from the head end of the body to the tail end of the body.

10. The device for treating spondylolysis according to claim 6, characterized in that: The transmission assembly comprises: The locking member has a locking position and a releasing position. In the locking position, the locking member is engaged with the transmission assembly to limit the movement of the transmission assembly. In the releasing position, the locking member is separated from the transmission assembly.

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