A two-way locking fusion device

Abstract

The present application relates to the field of fusion device, specifically to a bidirectional locking type fusion device, comprising an implant assembly provided with a fixed pin at one end; a sliding assembly connected with the implant assembly through sliding connection and provided with a movable pin at one end; a screw rod rotationally connected with the implant assembly and screw-connected with the sliding assembly; a first locking claw rotationally connected with the fixed pin and having a non-working end in contact with the sliding assembly; a second locking claw rotationally connected with the movable pin and having a non-working end in contact with the implant assembly or the screw rod; the relative movement of the implant assembly and the sliding assembly along the screw rod axis is realized by rotating the screw rod, and the first locking claw and the second locking claw are simultaneously expanded or closed. The first locking claw and the second locking claw of the embodiment of the present application are capable of synchronous expansion or closure and relative close at both ends of the fusion device, so that the fusion device can realize bidirectional locking during installation and provide more stable connection.

Description

Technical Field

[0001] This invention relates to the field of fusion devices, and more specifically to a bidirectional locking fusion device. Background Technology

[0002] Existing interbody fusion devices with inserts pose several risks during surgery, such as material deformation, breakage, insert cutting the fusion device, and breakage during insert removal. These problems not only increase the difficulty of the surgery but may also have serious consequences for the patient.

[0003] To address the aforementioned issues, various types of interbody fusion devices have been developed, including bilateral self-locking, unilateral self-locking, and those with limiting components. However, these self-locking devices cannot effectively adjust the position of their locking claws, making it difficult to securely lock adjacent vertebrae. Summary of the Invention

[0004] The purpose of this invention is to provide a bidirectional locking fusion device to solve the problems of traditional interbody fusion devices with inserts having multiple risks during surgery, and traditional self-locking fusion devices being unable to effectively adjust the position of their locking claws, making it difficult to firmly lock adjacent vertebrae above and below.

[0005] To solve the above-mentioned technical problems, the present invention specifically provides the following technical solution:

[0006] A bidirectional locking fusion device includes: an implantation component with a fixing pin at one end; a sliding component slidably connected to the implantation component with a movable pin at one end; a screw rotatably connected to the implantation component and helically connected to the sliding component; a first locking claw rotatably connected to the fixing pin, with its non-working end contacting the sliding component; and a second locking claw rotatably connected to the movable pin, with its non-working end contacting the implantation component or the screw. By rotating the screw, the implantation component and the sliding component can move relative to each other along the screw axis, while simultaneously driving the first locking claw and the second locking claw to open or close synchronously, thereby achieving a stable connection between adjacent vertebrae above and below.

[0007] Furthermore, the implantation component is a sleeve shape with open sides, and the first locking claw can unfold outward from the open side of the implantation component, with the opening of the implantation component facing the implantation direction; the implantation component includes two flat outer plates, which are arranged parallel and symmetrically to each other and are fixedly connected by a connecting block located at the middle position on the same side of the outer plates.

[0008] Furthermore, the two fixing pins are disposed on both sides of the same side of the implanted component and perpendicular to the two outer plates on the side where the connecting block is located, and each fixing pin is connected to one of the first locking claws.

[0009] Furthermore, the screw includes a first limiting member and a second limiting member, which are connected to the screw and respectively abut against the connecting block at both ends of the screw in the axial direction to restrict the axial movement of the screw.

[0010] Furthermore, the first limiting member is a cylinder and is fixedly connected to one end of the screw. The end of the first limiting member away from the screw has a prism or a prism-shaped hole. The second limiting member is a spring C-shaped retaining ring, which is sleeved on the outer circumferential surface of the screw and embedded into the screw through an annular groove on the screw.

[0011] Furthermore, the sliding assembly is a sleeve shape with open sides, and the second locking claw can unfold outward from the open side of the sliding assembly. The opening of the sliding assembly faces the opposite direction of the implantation direction. The sliding assembly includes an inner plate, a slider, and a nut. The inner plate is flat, and the two inner plates are arranged parallel and symmetrically between the two outer plates. The two sliders are respectively fixedly connected to the two inner plates. The two outer plates are provided with two guide grooves corresponding to the two sliders. The guide grooves are used to guide the sliders to move along the axis of the screw. Both inner plates are fixedly connected to the nut to ensure that the inner plates can move synchronously with the nut. The nut is connected to the screw through a screw connection. When the screw rotates, the inner plates can move along the axis of the screw.

[0012] Furthermore, one end of the slider is connected to a roller, and the outer plate is provided with a rolling groove corresponding to the roller. There is a height difference between the rolling groove and the guide groove, forming a step that can accommodate the roller, ensuring that the roller is guided and supported during the sliding process, and the roller can roll freely in the rolling groove.

[0013] Furthermore, a driven lever is provided at one end of the first locking claw near the inner plate, and a first drive plate and a second drive plate are provided at the part of the inner plate near the first locking claw. In the axial direction of the screw, the first drive plate is located at the far end of the driven lever, and the second drive plate is located at the near end of the driven lever.

[0014] Furthermore, the sliding assembly and the second locking claw are also connected via a guide mechanism. The guide mechanism includes a limiting slide rod fixedly connected to the second locking claw and a limiting slide groove disposed on the inner plate. The limiting slide rod is connected to the limiting slide groove, and the limiting slide groove is an arc shape coaxial with the movable pin. The limiting slide groove is used to limit the sliding stroke of the limiting slide rod, thereby limiting the rotation angle of the second locking claw to no more than 45 degrees.

[0015] Furthermore, the end of the second locking claw facing the screw has an arc-shaped outer wall, and the end of the second locking claw abuts against the end face of the screw, with the two connected by line contact.

[0016] Compared with the prior art, this application has the following advantages:

[0017] A bidirectional locking fusion device is provided. By setting a first locking claw and a second locking claw at both ends of the fusion device that can be simultaneously opened or closed and can be relatively close, the fusion device can achieve bidirectional locking during installation, providing a more stable connection and enhancing the stability between the upper and lower vertebral bodies. At the same time, the design of using a screw to drive the first locking claw and the second locking claw to open or close simultaneously simplifies the installation process, reduces complex operation steps during surgery, improves surgical efficiency, shortens surgical time, and allows the surgeon to more precisely control the installation and locking process of the fusion device during surgery, improving the controllability and safety of the surgery. Attached Figure Description

[0018] To more clearly illustrate the embodiments of the present invention or the technical solutions in 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 merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

[0019] Figure 1 This is a perspective view of an embodiment of the present invention;

[0020] Figure 2 This is an assembly diagram of an embodiment of the present invention;

[0021] Figure 3 This is an axial view of an embodiment of the present invention;

[0022] Figure 4 for Figure 3 A cross-sectional view along the AA direction;

[0023] Figure 5 for Figure 3 A cross-sectional view along the BB direction;

[0024] Figure 6 This is a schematic diagram of the implantation process according to an embodiment of the present invention;

[0025] Figure 7 This is a schematic diagram of the locking operation in an embodiment of the present invention.

[0026] The labels in the diagram represent the following:

[0027] 1-Implanted component; 11-Fixing pin; 12-Outer plate; 121-Guide groove; 122-Rolling groove; 123-Step; 13-Connecting block; 2-Sliding component; 21-Modible pin; 22-Nut; 23-Inner plate; 231-First drive plate; 232-Second drive plate; 233-Limiting groove; 24-Slider; 25-Roller; 3-Screw; 31-First limiting component; 32-Second limiting component; 4-First locking claw; 41-Driven lever; 5-Second locking claw; 51-Limiting slide bar. Detailed Implementation

[0028] 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, and 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] Existing interbody fusion devices with inserts pose several risks during surgery, such as material deformation, breakage, insert cutting the fusion device, and breakage during insert removal. These problems not only increase the difficulty of the surgery but may also have serious consequences for the patient.

[0030] To address these issues, there are already double-sided self-locking, single-sided self-locking, and interbody fusion cages with limiting components. However, these designs still pose a risk of damage to the fusion cage during installation and fixation, and the surgical procedures are complex.

[0031] To further optimize the installation and fixation process, reduce the risk of damage to the fusion device, and simplify surgical procedures, this embodiment provides a bidirectional locking fusion device. By improving the fixation and locking method, this fusion device significantly reduces the risk of damage to the fusion device during installation and simplifies the surgical procedure.

[0032] Combination Figure 1 The bidirectional locking fusion device includes: an implantation component 1, a sliding component 2, a screw 3, a first locking claw 4, and a second locking claw 5. The relative movement of the implantation component 1 and the sliding component 2 along the axis of the screw 3 is achieved by rotating the screw 3, as well as the opening and closing of the first locking claw 4 and the second locking claw 5.

[0033] Combination Figure 2The above components are connected as follows: the implant component 1 and the sliding component 2 are slidably connected, the screw 3 is rotatably connected to the implant component 1, and the screw 3 is helically connected to the sliding component 2. One end of the implant component 1 is provided with a fixing pin 11, and the first locking claw 4 is rotatably connected to the fixing pin 11. One end of the sliding component 2 is provided with a movable pin 21, and the second locking claw 5 is rotatably connected to the movable pin 21. The non-working end of the first locking claw 4 contacts the sliding component 2, so that the sliding component 2 can push the first locking claw 4 to rotate. The non-working end of the second locking claw 5 contacts the implant component 1 or the screw 3, so that the implant component 1 or the screw 3 can push the second locking claw 5 to rotate.

[0034] The contact methods mentioned above include point contact, line contact, and surface contact.

[0035] The steps for using a two-way locking fusion device during surgery include:

[0036] Implantation stage: Combination Figure 6 The doctor implanted the bidirectional locking fusion device into the intervertebral canal to ensure the initial fixation of implanted component 1 and sliding component 2.

[0037] Locking phase: Combination Figure 7 By rotating the screw 3, the implanted component 1 and the sliding component 2 move relative to each other along the axis of the screw 3, driving the first locking claw 4 and the second locking claw 5 to unfold synchronously and securely connect the upper and lower vertebrae.

[0038] Completion stage: After locking, ensure that the bidirectional locking fusion device is firmly fixed without the need for inserts, thus reducing the risk of damage to the fusion device.

[0039] Combination Figure 2 , Figure 3 , Figure 4 and Figure 5 .

[0040] Regarding the specific shape and structure of implanted component 1:

[0041] The implantation component 1 is a sleeve shape with open sides, with the opening of the sleeve facing the implantation direction of the device. The implantation component 1 includes an outer plate 12 and a connecting block 13, and the specific structure and connection method are described below.

[0042] The implantation component 1 includes two outer plates 12, both of which are flat. The two outer plates 12 are arranged in parallel and symmetrically. A connecting block 13 is located in the middle of the same side of the two outer plates 12. The two outer plates 12 are fixedly connected by the connecting block 13 to form the main frame of the fusion device, ensuring the stability of the structure.

[0043] Two fixing pins 11 are set on both sides of the same side of the implant component 1 and perpendicular to the two outer plates 12 on the side where the connecting block 13 is located. Each fixing pin 11 is connected to a first locking claw 4 to ensure that the first locking claw 4 can rotate stably and lock.

[0044] Regarding the specific shape and structure of screw 3, and the connection structure between screw 3 and implant component 1:

[0045] The two ends of the connecting block 13 located on the axis of the screw 3 abut against the first limiting member 31 and the second limiting member 32 respectively. The first limiting member 31 and the second limiting member 32 are connected to the screw 3 to restrict the axial movement of the screw 3, while not hindering the rotation of the screw 3.

[0046] The first limiting member 31 is a cylinder and is fixedly connected to one end of the screw 3. The end of the first limiting member 31 away from the screw 3 has a prism or a prism-shaped hole. The doctor can rotate the first limiting member 31 with an external hexagonal socket or an external hexagonal wrench to drive the screw 3 to rotate. The second limiting member 32 is an annular body and is sleeved on the outer circumferential surface of the screw 3.

[0047] In this embodiment, the first limiting member 31 and the screw 3 are integral parts and use standard internal hex bolts. The second limiting member 32 is a spring C-type retaining ring, and the screw 3 is provided with an annular groove for embedding the spring C-type retaining ring.

[0048] Regarding the specific shape and structure of the sliding component 2, and the connection structure between the sliding component 2 and the implanted component 1:

[0049] The sliding component 2 is a sleeve shape with open sides. The opening of the sleeve faces the opposite direction of the implantation direction of the device. The sliding component 2 includes a nut 22, an inner plate 23, a slider 24, and a roller 25. The specific structure and connection method are as follows.

[0050] The sliding assembly 2 includes two inner plates 23, both of which are flat. The two inner plates 23 are arranged parallel and symmetrically between two outer plates 12. Two sliders 24 are fixedly connected to the two inner plates 23 respectively. The two outer plates 12 are provided with two guide grooves 121 that are connected to the two sliders 24 respectively. The guide grooves 121 are used to guide the sliders 24 to move along the axis of the screw 3. Both inner plates 23 are fixedly connected to nuts 22 to ensure that the inner plates 23 can move synchronously with the nuts 22. The nuts 22 are connected to the screw 3 by a screw connection. When the screw 3 rotates, the inner plates 23 can move along the axis of the screw 3.

[0051] Furthermore, one end of the slider 24 is connected to a roller 25, and the outer plate 12 is provided with a rolling groove 122 corresponding to the roller 25. There is a height difference between the rolling groove 122 and the guide groove 121, and a step 123 is formed to accommodate the roller 25, ensuring that the roller 25 is effectively guided and supported during the sliding process. The roller 25 can roll freely in the rolling groove 122, reducing the friction and resistance of the slider 24 during the sliding process inside the guide groove 121.

[0052] Regarding the connection structure between the sliding component 2 and the first locking claw 4:

[0053] A driven lever 41 is provided at one end of the first locking claw 4 near the inner plate 23. A first drive plate 231 and a second drive plate 232 are provided at the part of the inner plate 23 near the first locking claw 4. The first drive plate 231 is located at the far end in the axial direction of the screw 3, and the second drive plate 232 is located at the near end in the axial direction of the screw 3.

[0054] As the sliding assembly 2 moves linearly, the driven lever 41 is pushed toward the proximal or distal end by the first drive plate 231 and the second drive plate 232, thereby ensuring that the inner plate 23 can effectively drive the rotation of the first locking claw 4.

[0055] Regarding the connection structure between the sliding component 2 and the second locking claw 5:

[0056] In addition to the movable pin 21, the sliding assembly 2 and the second locking claw 5 are also connected by a guide mechanism. The guide mechanism includes a limiting slide rod 51 fixedly connected to the second locking claw 5 and a limiting slide groove 233 provided on the inner plate 23. The limiting slide rod 51 is connected to the limiting slide groove 233, and the limiting slide groove 233 is an arc shape coaxial with the movable pin 21.

[0057] The limiting groove 233 is used to limit the sliding stroke of the limiting slide bar 51, thereby limiting the rotation angle of the second locking claw 5. This ensures that the rotation angle of the second locking claw 5 does not exceed 45 degrees during the implantation of the bidirectional locking fusion device, preventing the second locking claw 5 from moving beyond its limit and improving the accuracy and consistency of the locking action.

[0058] In this embodiment, the implanted component 1 does not contact the second locking claw 5, while the screw 3 contacts the second locking claw 5. Regarding the connection structure between the screw 3 and the second locking claw 5:

[0059] The second locking claw 5 has an arc-shaped outer wall at one end facing the screw 3, and the end of the second locking claw 5 abuts against the end face of the screw 3, and the two are connected by line contact.

[0060] The above embodiments are merely exemplary embodiments of the present invention and are not intended to limit the present invention. The scope of protection of the present invention is defined by the claims. Those skilled in the art can make various modifications or equivalent substitutions to the present invention within its spirit and scope of protection, and such modifications or equivalent substitutions should also be considered as falling within the scope of protection of the embodiments of the present invention.

Claims

1. A bidirectional locking fusion device, characterized in that, include: An implant component (1) is provided with a fixed pin (11) at one end; a sliding component (2) is slidably connected to the implant component (1) and is provided with a movable pin (21) at one end; a screw (3) is rotatably connected to the implant component (1) and helically connected to the sliding component (2); a first locking claw (4) is rotatably connected to the fixed pin (11) and its non-working end is in contact with the sliding component (2); a second locking claw (5) is rotatably connected to the movable pin (21) and its non-working end is in contact with the screw (3); by rotating the screw (3), the implant component (1) and the sliding component (2) can move relative to each other along the axis of the screw (3), and at the same time drive the first locking claw (4) and the second locking claw (5) to open or close synchronously, so as to achieve a stable connection between the upper and lower adjacent vertebrae; The implantation component (1) is a sleeve shape with open sides. The first locking claw (4) can be unfolded outward from the open side of the implantation component (1). The opening of the implantation component (1) faces the implantation direction. The implantation component (1) includes two flat outer plates (12). The two outer plates (12) are arranged parallel and symmetrically to each other and are fixedly connected by a connecting block (13) located in the middle of the same side of the outer plates (12). The sliding assembly (2) is a sleeve shape with open sides. The second locking claw (5) can unfold outward from the open side of the sliding assembly (2). The opening of the sliding assembly (2) faces the opposite direction of the implantation direction. The sliding assembly (2) includes an inner plate (23), a slider (24), and a nut (22). The inner plate (23) is flat. The two inner plates (23) are arranged parallel and symmetrically between the two outer plates (12). The two sliders (24) are fixedly connected to the two inner plates (23) respectively. The two outer plates (12) are fixedly connected to the two inner plates (23) respectively. 2) Two guide grooves (121) are provided on the upper part, which are connected to the two sliders (24) respectively. The guide grooves (121) are used to guide the sliders (24) to move along the axis of the screw (3). The two inner plates (23) are fixedly connected to the nuts (22) to ensure that the inner plates (23) can move synchronously with the nuts (22). The nuts (22) are connected to the screw (3) by a screw connection. When the screw (3) rotates, the inner plates (23) can move along the axis of the screw (3). The first locking claw (4) is provided with a driven lever (41) at one end near the inner plate (23), and the inner plate (23) is provided with a first drive plate (231) and a second drive plate (232) near the first locking claw (4). In the axial direction of the screw (3), the first drive plate (231) is located at the far end of the driven lever (41), and the second drive plate (232) is located at the near end of the driven lever (41). The sliding component (2) and the second locking claw (5) are also connected by a guide mechanism. The guide mechanism includes a limiting slide rod (51) fixedly connected to the second locking claw (5) and a limiting slide groove (233) provided on the inner plate (23). The limiting slide rod (51) is connected to the limiting slide groove (233), and the limiting slide groove (233) is an arc shape coaxial with the movable pin (21).

2. The bidirectional locking fusion device according to claim 1, characterized in that, Two fixing pins (11) are disposed on both sides of the same side of the implant component (1) and perpendicular to the two outer plates (12) on the side where the connecting block (13) is located, and each fixing pin (11) is connected to one of the first locking claws (4).

3. The bidirectional locking fusion device according to claim 1, characterized in that, The screw (3) includes a first limiting member (31) and a second limiting member (32). The first limiting member (31) and the second limiting member (32) are connected to the screw (3) and abut against the two ends of the connecting block (13) in the axial direction of the screw (3) to restrict the axial movement of the screw (3).

4. A bidirectional locking fusion device according to claim 3, characterized in that, The first limiting member (31) is a cylinder and is fixedly connected to one end of the screw (3). The end of the first limiting member (31) away from the screw (3) has a prism or a prism-shaped hole. The second limiting member (32) is a spring C-shaped retaining ring, which is sleeved on the outer circumferential surface of the screw (3) and embedded into the screw (3) through the annular groove on the screw (3).

5. A bidirectional locking fusion device according to claim 1, characterized in that, One end of the slider (24) is connected to a roller (25). The outer plate (12) is provided with a rolling groove (122) corresponding to the roller (25). There is a height difference between the rolling groove (122) and the guide groove (121), and a step (123) is formed to accommodate the roller (25), ensuring that the roller (25) is guided and supported during the sliding process. The roller (25) can roll freely in the rolling groove (122).

6. A bidirectional locking fusion device according to claim 1, characterized in that, The limiting groove (233) is used to limit the sliding stroke of the limiting slide bar (51), thereby limiting the rotation angle of the second locking claw (5) to no more than 45 degrees.

7. A bidirectional locking fusion device according to claim 1, characterized in that, The second locking claw (5) has an arc-shaped outer wall at one end facing the screw (3), and the end of the second locking claw (5) abuts against the end face of the screw (3), and the two are connected by line contact.

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