Percutaneous minimally invasive cervical vertebra interarticular self-stabilizing fusion cage

Abstract

The invention discloses a percutaneous minimally invasive cervical vertebra articular process self-stabilization fusion cage which comprises a guider, a fusion cage body, a kirschner wire catheter, a kirschner wire and a hollow screw. The front end of the guider is detachably connected with the bottom of the fusion cage, a groove is formed in the fusion cage, and a rotating handle used for connecting or separating the guider and the fusion cage is arranged at the rear end of the guider; the guide device is detachably provided with a screw channel guide device, the screw channel guide device is provided with a guide hole, the axis of the guide hole is collinear with the axis of the groove, the kirschner wire catheter is detachably arranged in the guide hole in a penetrating mode and points to the groove, and the kirschner wire penetrates through the kirschner wire catheter and is downwards inserted into the groove so that the hollow screw can penetrate through the kirschner wire to be implanted into the fusion cage. According to the scheme, accurate minimally invasive implantation and fixation of the fusion cage are achieved mainly through an in-vitro guide structure, and the problems that a traditional cervical vertebra zygopophysis fusion operation is large in trauma, high in view field requirement and large in operation difficulty are effectively solved.

Description

Technical Field

[0001] This invention relates to the field of orthopedic devices, and in particular to a percutaneous minimally invasive cervical interarticular self-stabilizing fusion device. Background Technology

[0002] Cervical facet fusion surgery is an important treatment for cervical degenerative diseases and cervical instability. Traditional cervical facet fusion surgery often employs an open surgical approach, requiring a large incision in the neck to dissect the skin, subcutaneous tissue, muscles, and other structures layer by layer to fully expose the surgical field before implanting and fixing the fusion device. This open surgical approach has several drawbacks: firstly, the large incision causes severe trauma to surrounding tissues, resulting in significant intraoperative bleeding and an increased risk of infection; secondly, the postoperative recovery time is long, patients experience intense pain, and are prone to complications such as neck muscle atrophy and limited mobility, severely impacting their quality of life.

[0003] With the development of minimally invasive techniques, minimally invasive cervical spine surgery has gradually gained attention. However, existing minimally invasive fusion devices still have shortcomings in terms of precise implantation and external stable fixation. Current fusion devices lack effective guiding structures, making it difficult to accurately insert them into the cervical facet joint space through small incisions. Furthermore, post-implantation screw fixation must be performed internally, which involves limited operating space, high positioning difficulty, and a risk of damaging surrounding nerves, blood vessels, and other important structures, thus affecting surgical safety and fusion outcomes. Therefore, developing a cervical facet joint fusion device that can achieve precise minimally invasive implantation and external stable fixation has significant clinical importance. Summary of the Invention

[0004] The present invention aims to at least solve one of the technical problems existing in the prior art. Therefore, one objective of the present invention is to provide a percutaneous minimally invasive cervical interarticular facet fusion device to overcome the problems of large trauma from open surgery, inaccurate positioning of minimally invasive instruments, and difficulty in fixation operation in the prior art.

[0005] The technical solution of the present invention is as follows: a percutaneous minimally invasive cervical interarticular self-stabilizing fusion device, characterized in that it comprises: a guide, a fusion device, a Kirschner wire catheter, a Kirschner wire, and a hollow screw;

[0006] The front end of the guide is detachably connected to the bottom of the fusion unit. The fusion unit has a groove. The rear end of the guide has a rotating handle for connecting or separating the guide from the fusion unit. The guide is detachably equipped with a pin guide with a guide hole. The axis of the guide hole is collinear with the axis of the groove. The Kirschner wire guide is detachably inserted through the guide hole and points towards the groove. The Kirschner wire passes through the Kirschner wire guide and is inserted downward into the groove so that the hollow screw can pass through the Kirschner wire and be implanted into the fusion unit.

[0007] The guide is used to guide the fusion device to be precisely inserted into the joint space of the cervical facet joint through a small external incision. At this time, the pin guide is located outside the body. The Kirschner wire catheter is first inserted into the pin guide to guide the Kirschner wire into the fusion device. Then the Kirschner wire catheter is removed, and the hollow screw is implanted into the fusion device inside the body along the Kirschner wire.

[0008] Furthermore, the front end of the guide is provided with a connector, which is threadedly connected to the fusion unit. The rotating handle is used to tighten or unscrew the connector to the bottom of the fusion unit.

[0009] Furthermore, the front end of the connector is provided with a positioning protrusion and a rotatable screw, the rotating handle is connected to the screw to drive the screw to rotate, the bottom of the fusion device is provided with a positioning hole and a screw hole, the positioning protrusion is inserted into the positioning hole, and the screw is threadedly engaged with the screw hole.

[0010] Furthermore, there are two positioning protrusions and two positioning holes, and they correspond one-to-one.

[0011] Furthermore, the guide has a movable groove inside, and the front end of the movable groove has a through hole that extends to the connector. The screw is a countersunk screw, which passes through the through hole and the screw head is located in the movable groove. The rear end of the guide has a rod groove that extends forward and communicates with the movable groove.

[0012] The rotating handle includes a handle body and a transmission rod disposed at the front end of the handle body. The transmission rod passes through the rod groove and is connected to the screw head. Rotating the handle body can drive the screw to rotate through the transmission rod, thereby tightening or loosening the screw from the bottom of the fusion device.

[0013] Furthermore, the guide and the spike guide are detachably connected via a threaded structure.

[0014] Furthermore, the outer peripheral wall of the guide is provided with a connecting protrusion with external threads, the nail guide is provided with a connecting rod, the connecting rod is provided with a connecting hole with internal threads, and the connecting protrusion is threadedly connected to the connecting hole.

[0015] Furthermore, the connecting rod is an arc-shaped rod with its center located on the fusion unit so that the spike guide and the fusion unit are arranged in concentric circles.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0017] 1. Minimally invasive implantation with minimal trauma: This procedure guides the fusion device through a small external incision to precisely insert it into the facet joint space of the cervical spine, eliminating the need for a large incision to expose the surgical field. This greatly reduces trauma to the neck tissues, lowers the risk of intraoperative bleeding and infection, and allows patients to recover quickly and experience less pain after surgery.

[0018] 2. Precise positioning and safe operation: The stable connection between the guide and the fusion device, as well as the coaxial design of the pin guide and the fusion device, ensures the precise placement of the fusion device and the accurate direction of the hollow screw insertion, avoiding damage to surrounding nerves and blood vessels due to inaccurate positioning and improving surgical safety.

[0019] 3. External operation, convenient and efficient: The rotating handle enables external locking and separation of the guide and fusion device. The screw guide allows the hollow screw to be implanted externally, eliminating the need for complex operations in the confined internal space, reducing surgical difficulty, shortening surgical time, and improving surgical efficiency.

[0020] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention, and the drawings are only examples and not strictly drawn to scale. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort:

[0022] Figure 1 This is a schematic diagram of the insertion of Kirschner wires according to the present invention;

[0023] Figure 2 This is a schematic diagram of the hollow screw implanted according to the present invention;

[0024] Figure 3 This is a schematic diagram of the front end of the guide of the present invention;

[0025] Figure 4 This is a cross-sectional schematic diagram of the guide of the present invention.

[0026] Figure label:

[0027] 1. Guide; 2. Fusion device; 3. Kirschner wire guide; 4. Rotating handle; 5. Pin guide; 6. Groove; 7. Connector; 8. Positioning protrusion; 9. Screw; 10. Moving groove; 11. Through hole; 12. Rod groove; 13. Handle body; 14. Drive rod; 15. Connecting protrusion; 16. Connecting rod; 17. Kirschner wire; 18. Hollow screw. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0029] The embodiments of the present invention are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. In the description of the present invention, it should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "inner," "outer," "vertical," "circumferential," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0030] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0031] In the description of this invention, "first feature" and "second feature" may include one or more of the indicated features. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first" and "second" may explicitly or implicitly include one or more of the indicated features.

[0032] Please refer to the attached diagram below. Figures 1-4 A percutaneous minimally invasive cervical interarticular self-stabilizing fusion device 2 according to an embodiment of the present invention is described, comprising: a guide 1, a fusion device 2, a Kirschner wire catheter 3, a Kirschner wire 17, and a hollow screw 18.

[0033] like Figure 1 and Figure 2As shown, the front end of the guide 1 is detachably connected to the bottom of the fusion unit 2. The fusion unit 2 is provided with a groove 6. The rear end of the guide 1 is provided with a rotating handle 4 for connecting or separating the guide 1 from the fusion unit 2. The guide 1 is detachably provided with a pin guide 5. The pin guide 5 is provided with a guide hole. The axis of the guide hole is collinear with the axis of the groove. The Kirschner wire guide 3 is detachably inserted into the guide hole and points to the groove 6. The Kirschner wire 17 passes through the Kirschner wire guide 3 and is inserted downward into the groove 6 so that the hollow screw 18 can pass through the Kirschner wire 17 and be implanted into the fusion unit 2.

[0034] The guide 1 is used to guide the fusion device 2 to be precisely inserted into the joint space of the cervical facet joint through a small external incision. At this time, the pin guide 5 is located outside the body. The Kirschner wire catheter 3 is first inserted into the pin guide 5 to guide the Kirschner wire 17 into the fusion device 2. Then the Kirschner wire catheter 3 is removed, and the hollow screw 18 is implanted into the fusion device 2 inside the body along the Kirschner wire 17.

[0035] This allows for minimally invasive implantation, eliminating the need for large incisions to expose the surgical field, significantly reducing trauma to neck tissues, lowering the risk of intraoperative bleeding and infection, and resulting in faster postoperative recovery and less pain. Furthermore, the stable connection between the guide 1 and the fusion unit 2, as well as the coaxial design of the screw guide 5 and the fusion unit 2, ensures precise implantation of the fusion unit 2 and accurate insertion of the hollow screw 18, avoiding damage to surrounding nerves and blood vessels due to inaccurate positioning and improving surgical safety.

[0036] The rotating handle 4 enables the external locking and separation of the guide 1 and the fusion device 2. The screw guide 5 allows the hollow screw 18 to be implanted externally, eliminating the need for complex operations in a confined internal space, thus reducing the difficulty of the surgery, shortening the operation time, and improving the efficiency of the surgery.

[0037] In some implementations, such as Figure 1 and Figure 2 As shown, the front end of the guide 1 is provided with a connector 7, which is threadedly connected to the fusion unit 2. The rotating handle 4 is used to tighten or unscrew the connector 7 to the bottom of the fusion unit 2. The threaded connection method has the characteristics of simple structure, reliable connection and convenient disassembly, which can ensure that the guide 1 and the fusion unit 2 are stably connected during the implantation process, avoid relative displacement affecting the implantation accuracy, and allow the guide 1 to be easily separated after implantation.

[0038] Furthermore, the front end of the connector 7 is provided with a positioning protrusion 8 and a rotatable screw 9. The rotating handle 4 is connected to the screw 9 to drive the screw 9 to rotate. The bottom of the fusion unit 2 is provided with a positioning hole and a screw hole. There are two positioning protrusions 8 and two corresponding positioning holes. The positioning protrusion 8 is inserted into the positioning hole, and the screw 9 is threaded into the screw hole. Thus, through the cooperation of the positioning protrusion 8 and the positioning hole, the screw 9 can be directly aligned with the screw hole, which facilitates the subsequent connection of the screw 9 and the screw hole.

[0039] In some implementations, such as Figure 3 As shown, the guide 1 has a moving groove 10 inside, and the front end of the moving groove 10 has a through hole 11 that extends to the connector 7. The screw 9 is a countersunk screw 9, which passes through the through hole 11 and the screw head is located in the moving groove 10. The rear end of the guide 1 has a rod groove 12, which extends forward and communicates with the moving groove 10. The rotating handle 4 includes a handle body 13 and a transmission rod 14 located at the front end of the handle body 13. The transmission rod 14 passes through the rod groove 12 and is connected to the screw head. Rotating the handle body 13 can drive the screw 9 to rotate through the transmission rod 14, thereby tightening or separating the screw 9 from the bottom of the fusion device 2.

[0040] The rotating handle 4 allows doctors to easily lock and separate the guide 1 and fusion device 2 from outside the body, making the operation convenient and labor-saving, and reducing the difficulty of the surgery.

[0041] In some implementations, the guide 1 and the nail guide 5 are detachably connected via a threaded structure. This helical connection facilitates the rapid installation and positioning of the nail guide 5, ensuring its stable position during nail insertion and providing precise guidance for the implantation of hollow screws.

[0042] The guide 1 has a connecting protrusion 15 with external threads on its outer peripheral wall, and the nail guide 5 has a connecting rod 16 with an internal threaded connecting hole. The connecting protrusion 15 is threadedly connected to the connecting hole.

[0043] In some embodiments, the connecting rod 16 is an arc-shaped rod with its center located on the fusion unit 2, so that the pin guide 5 and the fusion unit 2 form a concentric circle arrangement. The concentric circle design ensures that the insertion direction of the hollow screw 18 is consistent with the axis of the groove 6 of the fusion unit 2, ensuring that the hollow screw is accurately inserted into the fusion unit 2, improving fixation stability, and avoiding damage to surrounding tissues due to hollow screw misalignment.

[0044] The procedure for using this device is as follows:

[0045] S1. Preoperative imaging examination of the patient's cervical spine is performed to determine the surgical site and the implantation location of fusion device 2.

[0046] S2. Make a small incision of about 1-2 cm in length at the surgical site on the neck, and dissect layer by layer to the vicinity of the facet joint space of the cervical vertebrae;

[0047] S3. Connect the bottom of the fusion unit 2 to the connector 7 at the front end of the guide 1 using threads. Rotate the handle body 13 of the rotating handle 4 to tighten and fix the guide 1 to the bottom of the fusion unit 2.

[0048] S4. Guide the fusion device 2 through a small incision and slowly insert it into the facet joint space of the cervical vertebrae until the fusion device 2 reaches the preset position.

[0049] S5. Install the spike guide 5 on the guide 1, ensuring that the axis of the guide hole of the spike guide 5 coincides with the axis of the hollow screw hole of the fusion unit 2.

[0050] S6. First, insert the Kirschner wire guide 3 into the pin guide 5, then insert the Kirschner wire 17 into the fusion device 2 through the Kirschner wire guide 3, then remove the Kirschner wire guide 3, then put the hollow screw 18 on the Kirschner wire 17, and implant it into the fusion device 2 in the body along the Kirschner wire 17 to complete the fixation of the fusion device 2.

[0051] After the hollow screw 18 is implanted, remove the Kirschner wire 17, then rotate the handle 4 in the opposite direction to unscrew the guide 1 from the bottom of the fusion device 2 and remove the guide 1 and the nail guide 5 from the incision.

[0052] S8. Suture the incision layer by layer to complete the surgery.

[0053] In summary, this solution mainly achieves precise and minimally invasive implantation and fixation of the fusion device 2 through a sophisticated external guiding structure, transforming complex in vivo operations into simple external operations. It integrates the four core requirements of minimally invasive, precise, safe, and convenient, effectively solving the pain points of traditional cervical facet fusion surgery, such as large trauma, high visual requirements, and high operational difficulty.

[0054] Although some embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and variations of these embodiments without departing from the principles and spirit of the present invention are within the scope of protection of the claims of the present invention.

Claims

1. A percutaneous minimally invasive cervical interarticular self-stabilizing fusion device, characterized in that, include: Guide, fusion device, Kirschner wire guide, Kirschner wire and hollow screw; The front end of the guide is detachably connected to the bottom of the fusion unit. The fusion unit has a groove. The rear end of the guide has a rotating handle for connecting or separating the guide from the fusion unit. The guide is detachably equipped with a pin guide with a guide hole. The axis of the guide hole is collinear with the axis of the groove. The Kirschner wire guide is detachably inserted through the guide hole and points towards the groove. The Kirschner wire passes through the Kirschner wire guide and is inserted downward into the groove so that the hollow screw can pass through the Kirschner wire and be implanted into the fusion unit. The guide is used to guide the fusion device to be precisely inserted into the joint space of the cervical facet joint through a small external incision. At this time, the pin guide is located outside the body. The Kirschner wire catheter is first inserted into the pin guide to guide the Kirschner wire into the fusion device. Then the Kirschner wire catheter is removed, and the hollow screw is implanted into the fusion device inside the body along the Kirschner wire.

2. The percutaneous minimally invasive cervical interarticular self-stabilizing fusion device according to claim 1, characterized in that, The guide has a connector at its front end, which is threaded to the fusion unit. The rotating handle is used to tighten or untighten the connector to the bottom of the fusion unit.

3. The percutaneous minimally invasive cervical interarticular self-stabilizing fusion device according to claim 2, characterized in that, The connector has a positioning protrusion and a rotatable screw at its front end. The rotating handle is connected to the screw to drive the screw to rotate. The bottom of the fusion device has a positioning hole and a screw hole. The positioning protrusion is inserted into the positioning hole, and the screw is threaded into the screw hole.

4. The percutaneous minimally invasive cervical interarticular self-stabilizing fusion device according to claim 3, characterized in that, The guide has a movable groove inside, and the front end of the movable groove has a through hole that extends to the connector. The screw is a countersunk screw, which passes through the through hole and the screw head is located in the movable groove. The rear end of the guide has a rod groove that extends forward and communicates with the movable groove. The rotating handle includes a handle body and a transmission rod disposed at the front end of the handle body. The transmission rod passes through the rod groove and is connected to the screw head. Rotating the handle body can drive the screw to rotate through the transmission rod, thereby tightening or loosening the screw from the bottom of the fusion device.

5. The percutaneous minimally invasive cervical interarticular self-stabilizing fusion device according to claim 1, characterized in that, The guide and the spike guide are detachably connected via a threaded structure.

6. The percutaneous minimally invasive cervical interarticular self-stabilizing fusion device according to claim 5, characterized in that, The guide has a connecting protrusion with external threads on its outer peripheral wall, and the nail guide has a connecting rod with a connecting hole with internal threads. The connecting protrusion is threadedly connected to the connecting hole.

7. The percutaneous minimally invasive cervical interarticular self-stabilizing fusion device according to claim 6, characterized in that, The connecting rod is an arc-shaped rod with its center located on the fusion unit so that the spike guide and the fusion unit are arranged in concentric circles.

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