Pedicle screw and spine fixing system

Abstract

The utility model relates to the field of medical instruments, and provides a pedicle screw and a spine fixing system.The pedicle screw comprises a screw body, a connector and a locker, at least part of the screw body is used for being implanted into the spine of the human body, the screw body is provided with an injection hole channel, and the injection hole channel is used for injecting bone cement; the connector is provided with a connecting part, the connecting part is fixed on the outer side wall of the nail body, the connecting part is provided with a groove, and the groove is used for installing a pre-bent connecting rod; the screw body is provided with an external thread section, the external thread section and a groove opening of the groove are located on the same side of the connecting part, the locker is arranged on the external thread section in a sleeving mode and connected with the external thread section in a threaded mode, and the locker is provided with a supporting lug used for covering the groove opening of the groove so that the pre-bent connecting rod can be locked in the groove. Then the bone cement is injected, the bone cement cannot deflect along with the pre-bent connecting rod, the fixing effect of the bone cement in the vertebral body is guaranteed, and then the vertebral body repairing effect of a spinal operation is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of medical devices, in particular to a pedicle screw and a spinal fixation system. Background Art

[0002] When a doctor performs a spinal surgery, a fixation fusion operation is used to correct the patient's spine. In the fixation fusion operation, a pre-bent connecting rod and a pedicle screw play key roles.

[0003] In the prior art, during the surgery, for patients with bone diseases such as fractures or osteoporosis, the doctor first implants the pedicle screw into the vertebral body of the human body, and then injects bone cement along the injection channel of the screw body so that the bone cement is implanted into the vertebral body; after the bone cement is cured, the pedicle screw and the vertebral body are integrated, and then the pre-bent connecting rod and the pedicle screw are fixed. The overall connection strength of the rod-screw-bone cement is very high, and due to the possible difference between the physiological curvature of the pre-bent connecting rod and the vertebral body and the relatively high strength of the pre-bent connecting rod itself, during the connection process of the pedicle screw and the pre-bent connecting rod, the bone cement will deflect along with the pre-bent connecting rod, resulting in the loosening of the bone cement in the vertebral body and the fixation failure, and it is difficult to ensure a better spinal repair effect. Summary of the Utility Model

[0004] The utility model provides a pedicle screw and a spinal fixation system to solve the problem in the prior art that during a spinal surgery by a doctor, the bone cement deflects along with the pre-bent connecting rod, resulting in the loosening of the bone cement in the vertebral body and the fixation failure, and it is difficult to ensure a better spinal repair effect.

[0005] In a first aspect, the utility model provides a pedicle screw, comprising: a screw body, a connector and a locking device. At least part of the screw body is used for being implanted into the spine of the human body;

[0006] The connector has a connecting part which is fixed on the outer side wall of the screw body. The connecting part is provided with a groove for installing a pre-bent connecting rod; the screw body has an external thread section, and the external thread section and the notch of the groove are located on the same side of the connecting part. The locking device is sleeved on the external thread section and is in threaded connection with the external thread section. The locking device has an ear for covering the notch of the groove to lock the pre-bent connecting rod in the groove;

[0007] The screw body has an injection channel for injecting bone cement so that the bone cement penetrates into the spine of the human body.

[0008] According to a pedicle screw provided by the present utility model, the connecting portion is provided with a convex block, the convex block protrudes from the notch end of the groove, and the lug is provided with a connecting hole in the area outside the groove. As the lock-in device is screwed in, the convex block is inserted into the connecting hole, so that the lug covers the groove.

[0009] According to a pedicle screw provided by the present utility model, the connector further has a guiding portion, the guiding portion is connected to the convex block, the guiding portion is arranged parallel to the nail body, and the guiding portion passes through the connecting hole for guiding the lock-in device to move linearly along the length direction of the guiding portion.

[0010] According to a pedicle screw provided by the present utility model, a tear line is provided at the connection between the guiding portion and the convex block.

[0011] According to a pedicle screw provided by the present utility model, the lock-in device includes a lock nut and a lock body. The lock nut is sleeved on the external thread section, and the lock body is sleeved on the lock nut; or, the lock-in device has a screwing hole, and the hole wall of the screwing hole has an internal thread adapted to the external thread section, and the screwing hole is sleeved on the external thread section.

[0012] According to a pedicle screw provided by the present utility model, the nail body is provided with a limiting protrusion, and the connecting portion is sleeved on the nail body and abuts against the limiting protrusion.

[0013] According to a pedicle screw provided by the present utility model, the limiting protrusion extends along the circumferential direction of the nail body to form a support seat for supporting the connecting portion.

[0014] According to a pedicle screw provided by the present utility model, the connecting portion and the nail body are integrally connected.

[0015] According to a pedicle screw provided by the present utility model, the groove is an arc-shaped groove, and the size of the arc-shaped groove is adapted to the size of the pre-bent connecting rod.

[0016] In a second aspect, the present utility model further provides a spinal fixation system, including a bone cement syringe, a pre-bent connecting rod, and a plurality of pedicle screws as described in any one of the above. The pre-bent connecting rod is sequentially clamped and fixed between a plurality of the grooves and the lugs, and the injection head of the bone cement syringe is inserted into the injection channel for injecting bone cement into the spine of the human body.

[0017] The present utility model provides a pedicle screw and a spinal fixation system. The injection channel of the screw body is used to inject bone cement so that the bone cement penetrates into the human spine. The connecting part is fixed to the outer side wall of the screw body. The connecting part is provided with a groove which is used to install a pre-bent connecting rod. The external thread section of the screw body and the notch of the groove are located on the same side of the connecting part. The locking device is sleeved on the external thread section and is threadedly connected with the external thread section. As the locking device is screwed in, the ear of the locking device covers the notch of the groove, thereby locking the pre-bent connecting rod in the groove. The pre-bent connecting rod can be first installed into the groove to ensure that the posture of the pre-bent connecting rod is adapted to the posture of the human spine, and then the operation of injecting bone cement can be carried out. The pre-bent connecting rod can be first installed on the screw body, and then bone cement is injected. The bone cement will not deflect with the pre-bent connecting rod, ensuring the fixing effect of the bone cement in the vertebral body, and further ensuring the repair effect of the vertebral body in spinal surgery. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0019] Figure 1 is the overall structural schematic diagram of the pedicle screw provided by the present utility model.

[0020] Figure 2 is the structural schematic diagram of the screw body provided by the present utility model.

[0021] Figure 3 is the structural schematic diagram of the connector provided by the present utility model.

[0022] Figure 4 is the structural schematic diagram of the locking device provided by the present utility model.

[0023] REFERENCE SIGNS:

[0024] 1, screw body; 11, external thread section; 12, limit projection; 13, injection channel; 2, connector; 21, connecting part; 22, guiding part; 211, groove; 212, convex block; 213, tearing line; 214, through hole; 3, locking device; 31, ear; 32, locking nut; 33, locking body; 331, installation hole; 311, connecting hole. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0025] To make the objectives, technical solutions, and advantages of the present utility model clearer, the following will clearly and completely describe the technical solutions in the present utility model in conjunction with the accompanying drawings in the present utility model. Obviously, the described embodiments are some, but not all, of the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present utility model without creative efforts fall within the protection scope of the present utility model.

[0026] The terms "first" and "second" in the description and claims of the present utility model may explicitly or implicitly include one or more of such features. In the description of the present utility model, unless otherwise specified, the meaning of "a plurality" is two or more. In addition, "and / or" in the description and claims indicates at least one of the connected objects. The character " / " generally indicates an "or" relationship between the associated objects before and after.

[0027] In the description of the present utility model, it should be understood that the orientation or positional relationships indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present utility model.

[0028] In the description of the present utility model, it should be noted that, unless otherwise clearly specified and defined, the terms "installation", "connection", and "coupling" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0029] The following will be combined with Figures 1 - 4 , and through specific embodiments and their application scenarios, a pedicle screw and a spinal fixation system provided by the embodiments of the present utility model will be described in detail.

[0030] As Figure 1 shown, the present utility model provides a pedicle screw, including: a screw body 1, a connector 2, and a lock 3. At least a part of the screw body 1 is used for implantation in the human spine.

[0031] The connector 2 has a connecting portion 21. The connecting portion 21 is fixed to the outer wall of the nail body 1. The connecting portion 21 is provided with a groove 211 for installing a pre-bent connecting rod. The nail body 1 has an external thread section 11, and the external thread section 11 and the notch of the groove 211 are located on the same side of the connecting portion 21. The locking device 3 is sleeved on the external thread section 11 and is threadedly connected to the external thread section 11. The locking device 3 has an ear 31 for covering the notch of the groove 211 to lock the pre-bent connecting rod in the groove 211.

[0032] The nail body 1 has an injection channel 13. The injection channel 13 is used for injecting bone cement so that the bone cement penetrates into the human spine.

[0033] It can be understood that the shape of the pre-bent connecting rod is adapted to the shape of the human spine. In spinal fixation surgery, the pre-bent connecting rod is arranged in conformity with the human spine to support the human spine. The higher the degree of conformity between the pre-bent connecting rod and the curve of the human spine, the more conducive to the recovery of the patient's spine and the more it can reduce the patient's pain. The pedicle screw is used to fix the position and posture of the pre-bent connecting rod.

[0034] Among them, as Figure 1 and Figure 2 shown, the nail body 11 has an injection channel 13, and the injection channel 13 extends along the axial direction of the nail body 1. One end of the nail body 1 is used for implanting at the affected part such as a fracture in the human spine. The injection channel 13 is used for injecting bone cement so that the bone cement penetrates into the spine. After the bone cement solidifies, it forms an integral body with the human spine, thereby achieving the effect of strengthening the spine strength or treating spinal diseases.

[0035] The fixing position of the traditional pre-bent connecting rod is in the extending direction of the nail body 1, so that the doctor needs to fix the pre-bent connecting rod after the bone cement in the injection channel 13 solidifies. However, for the pedicle screw provided by the present utility model, as Figure 1 shown, the connecting portion 21 is fixed to the outer wall of the nail body 1. The connecting portion 21 protrudes from the nail body 1. The connecting portion 21 is provided with a groove 211. The notch of the groove 211 faces away from the human spine. The groove 211 is used for installing a pre-bent connecting rod. Further, the other end of the nail body 1 is provided with an external thread section 11. The locking device 3 is sleeved on the external thread section 11 and is threadedly connected to the external thread section 11, so that the locking device 3 can move along the axial direction of the nail body 1.

[0036] The utility model provides a pedicle screw. The injection channel 13 of the screw body 1 is used for injecting bone cement so that the bone cement penetrates into the human spine. The connecting part 21 is fixed to the outer wall of the screw body 1. The connecting part 21 is provided with a groove 211 which is used for installing a pre-bent connecting rod. The external thread section 11 of the screw body 1 and the notch of the groove 211 are located on the same side of the connecting part 21. The locking device 3 is sleeved on the external thread section 11 and is in threaded connection with the external thread section 11. As the locking device 3 is screwed in, the lug 31 of the locking device 3 covers the notch of the groove 211, so as to lock the pre-bent connecting rod in the groove 211. The pre-bent connecting rod can be first installed in the groove 211 to ensure that the posture of the pre-bent connecting rod is adapted to the posture of the human spine, and then the bone cement injection operation is carried out. The bone cement will not deflect along with the pre-bent connecting rod, ensuring the fixing effect of the bone cement in the vertebral body and further ensuring the repair effect of the vertebral body in the spinal operation.

[0037] As Figure 3 shown, in some embodiments, the connecting part 21 is provided with a convex block 212. The convex block 212 protrudes from the notch end of the groove 211. The lug 31 is provided with a connecting hole 311 in the area outside the groove 211. As the locking device 3 is screwed in, the convex block 212 is inserted into the connecting hole 311, so that the lug 31 covers the groove 211.

[0038] It can be understood that the convex block 212 protrudes from the end face of the notch end of the groove 211, so as to form an abutting surface at the notch end of the groove 211. As the locking device 3 is screwed in, the convex block 212 is inserted into the connecting hole 311, so that the side surface of the lug 31 facing the connecting part 21 abuts against the abutting surface, thereby improving the connection stability between the lug 31 and the connecting part 21 and ensuring that the pre-bent connecting rod is firmly fixed in the groove 211.

[0039] Furthermore, in some embodiments, as Figure 3 shown, the connector 2 further has a guiding part 22. The guiding part 22 is connected to the convex block 212 and is arranged parallel to the screw body 1. The guiding part 22 passes through the connecting hole 311 and is used for guiding the locking device 3 to move linearly along the length direction of the guiding part 22.

[0040] It can be understood that the guiding part 22 is in a rod shape. One end of the guiding part 22 is connected to the convex block 212. The guiding part 22 is arranged parallel to the axial direction of the screw body 1. The guiding part 22 passes through the connecting hole 311 of the lug 31, so that in the process of the locking device 3 being screwed along the external thread section 11, the guiding part 22 can guide the locking device 3 to stably move along the axial direction of the screw body 1 to the notch of the groove 211, so that the convex block 212 is inserted into the connecting hole 311, and further ensuring that the pre-bent connecting rod is firmly fixed in the groove 211.

[0041] As Figure 3As shown, a tear line 213 is provided at the connection between the guiding part 22 and the bump 212, so that after the lug 31 is firmly fixed at the notch of the groove 211, the guiding part 22 can be torn off from the bump 212 along the tear line 213, reducing the occupied space of the surgical part in the human body and improving the human comfort level.

[0042] In some embodiments, as Figure 1 and Figure 4 shown, the locking device 3 includes a locking nut 32 and a locking body 33. The locking nut 32 is sleeved on the external thread section 11, and the locking body 33 is sleeved on the locking nut 32.

[0043] It can be understood that the thread of the locking nut 32 is adapted to the external thread section 11. One end of the locking nut facing the connecting part is oval. The locking body 33 is provided with an arc groove adapted to the locking nut 32, and the locking nut 32 is fixed to the wall of the arc groove, so that the locking nut 32 and the locking body 33 are connected together. The lug 31 and the locking body 33 can be an integrally connected structure. The locking body 33 is provided with a mounting hole 331 for the nail body 1 to pass through. As the locking nut 32 is screwed in, the locking body 33 covers the notch of the groove 211, so as to firmly fix the pre-bent connecting rod in the groove 211.

[0044] In some other embodiments, the locking device 3 has a screwing hole. The hole wall of the screwing hole has an internal thread adapted to the external thread section 11, and the screwing hole is sleeved on the external thread section 11. In this embodiment, the locking nut 32 may not be provided, and an internal thread adapted to the external thread section 11 is directly provided on the hole wall of the mounting hole 331 of the locking body 33, and then the locking body 33 is sleeved on the external thread section 11, which can also achieve firmly covering the lug 31 at the notch of the groove 211.

[0045] Furthermore, as Figure 1 and Figure 2 shown, the nail body 1 is provided with a limiting protrusion 12. The connecting part 21 is sleeved on the nail body 1 and abuts against the limiting protrusion 12. The limiting protrusion 12 is provided on the outer side wall of the nail body 1, and the connecting part 21 is provided with a through hole 214. The nail body 1 passes through the through hole 214, and one side surface of the connecting part 21 abuts against the limiting protrusion 12, so as to firmly fix the position of the connecting part 21 at this place, prevent the connecting part 21 from moving along the axial direction of the nail body 1, and further ensure the stability of the installation of the pre-bent connecting rod.

[0046] It should be noted that the connecting part 21 is sleeved on the nail body 1, and when a small adjustment of the position of the groove 211 is required, the position of the groove 211 can be slightly deflected by rotating the connecting part 21, so as to adapt to the curvature of the pre-bent connecting rod.

[0047] Specifically, as Figure 2As shown, the limiting protrusion 12 extends along the circumferential direction of the nail body 1 to form a support seat for supporting the connecting portion 21. Among them, the limiting protrusion 12 extends along the circumferential wall of the nail body 1 to form an annular support seat, so that the support seat can both limit the connecting portion 21 and support the connecting portion 21 and the pre-bent connecting rod.

[0048] Alternatively, in some embodiments, the connecting portion 21 and the nail body 1 are integrally connected, as long as it can be ensured that the position of the groove 211 is not easily displaced.

[0049] Preferably, as Figure 3 shown, the groove 211 is an arc-shaped groove. The size of the arc-shaped groove is adapted to the size of the pre-bent connecting rod, so that the groove wall of the arc-shaped groove is closely attached to the outer wall of the pre-bent connecting rod, further ensuring that the pre-bent connecting rod can be firmly fixed in the groove 211.

[0050] In a second aspect, the present utility model further provides a spinal fixation system, including a bone cement syringe, a pre-bent connecting rod, and a plurality of pedicle screws as described above. The pre-bent connecting rod is sequentially clamped and fixed between a plurality of grooves 211 and the ear portions 31. The injection head of the bone cement syringe is inserted into the injection channel 13 for injecting bone cement into the spine of the human body.

[0051] It can be understood that in medical or surgical operations, the bone cement syringe is mainly used to inject bone cement into the treatment site of fractures or bone diseases. Bone cement is a composite of polymethyl methacrylate, which is used to fill and fix the fracture or bone disease site to strengthen the bone structure or relieve pain.

[0052] The bone cement syringe includes a syringe body and an injection head. The syringe body is provided with a plunger and a control handle. The bone cement is loaded in the cavity of the syringe body. The injection head is arranged at the end of the syringe for evenly injecting the bone cement into the target site. Further, the nail body 1 has an injection channel 13, and the injection head of the bone cement syringe is inserted into the injection channel 13. At least a part of the nail body 1 is implanted at the treatment site of the fracture or bone disease. By pushing the plunger through the control handle, the bone cement is ejected from the injection head, so that the bone cement is injected into the spine of the human body. During the injection process, it is necessary to precisely control the injection speed of the injection head to ensure that the bone cement is evenly distributed in the spine.

[0053] Since the spinal fixation system includes pedicle screws, and the specific structure of the pedicle screws refers to the above embodiments, the spinal fixation system of this embodiment includes all the technical solutions of the above embodiments. Therefore, it has at least all the beneficial effects obtained by all the technical solutions of the above embodiments, which will not be elaborated here one by one.

[0054] 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 foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A pedicle screw, characterized in that: include: A nail body, a connector and a locker, wherein at least a portion of the nail body is implanted in a human spine; The connector has a connecting portion, which is fixed to the outer side wall of the nail body, and the connecting portion is provided with a groove, and the groove is used to install the pre-bent connecting rod; the nail body has an external thread section, and the notch of the external thread section and the groove are located on the same side of the connecting portion, and the locking device is sleeved on the external thread section and threadedly connected to the external thread section, and the locking device has a support ear for covering the notch of the groove, so as to lock the pre-bent connecting rod in the groove; The nail body has an injection channel, and the injection channel is used to inject bone cement so that the bone cement penetrates into the spine of the human body.

2. The pedicle screw according to claim 1, characterized in that: The connecting portion is provided with a protrusion, which is protruding from the notch end of the groove. The area of ​​the ear outside the groove is provided with a connecting hole. As the locker is screwed in, the protrusion is inserted into the connecting hole, so that the ear cover is arranged in the groove.

3. The pedicle screw according to claim 2, characterized in that: The connector further comprises a guide portion, the guide portion is connected to the protrusion, the guide portion and the nail body are arranged in parallel, and the guide portion is passed through the connecting hole to guide the locker to move linearly along the length direction of the guide portion.

4. The pedicle screw according to claim 3, characterized in that: A tear line is provided at the connection between the guide portion and the protrusion.

5. The pedicle screw according to claim 1, characterized in that: The locking device comprises a locking nut and a locking body, wherein the locking nut is sleeved on the external thread section, and the locking body is sleeved on the locking nut; or, the locking device has a screw-in hole, the hole wall of the screw-in hole has an internal thread adapted to the external thread section, and the screw-in hole is sleeved on the external thread section.

6. The pedicle screw according to claim 1, characterized in that: The nail body is provided with a limiting protrusion, and the connecting portion is sleeved on the nail body and abuts against the limiting protrusion.

7. The pedicle screw according to claim 6, characterized in that: The limiting protrusion extends along the circumference of the nail body to form a support seat for supporting the connecting part.

8. The pedicle screw according to claim 1, characterized in that: The connecting portion and the nail body are connected as one piece.

9. The pedicle screw according to claim 1, characterized in that: The groove is an arc-shaped groove, and the size of the arc-shaped groove is adapted to the size of the pre-bent connecting rod.

10. A spinal fixation system, characterized in that: It comprises a bone cement injector, a pre-bent connecting rod and a plurality of pedicle screws as described in any one of claims 1 to 9, wherein the pre-bent connecting rod is clamped and fixed in sequence to the plurality of grooves and the ears, and the injection head of the bone cement injector is inserted into the injection channel for injecting bone cement into the human spine.

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