Cervical vertebra titanium cage fixing device

Abstract

The invention discloses a cervical vertebra titanium cage fixing device, and belongs to the technical field of medical instruments, the cervical vertebra titanium cage fixing device comprises a titanium plate, a titanium cage body is embedded in the front side of the titanium plate through two mounting plates, a positioning assembly is arranged in a rotating seat, and positioning and fixing of a positioning screw after rotating and positioning can be achieved through the arranged positioning assembly. According to the cervical vertebra titanium cage fixing device, the titanium plate is connected with the cervical vertebra of a patient in an attached mode through the titanium cage body, then the two positioning screws are connected to the cone in a rotating and positioning mode through the mounting holes formed in the rotating base, and then the titanium cage body can be positioned and fixed; the two extrusion springs can automatically eject the two positioning blocks into the positioning grooves formed in the two sides of the positioning screw through the elastic force of the two extrusion springs, so that the position of the positioning screw subjected to rotating positioning is positioned and fixed, and the phenomenon that the positioning screw loosens and falls off due to shaking in the later use process of being matched with a patient is avoided.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, specifically to a cervical spine titanium cage fixation device. Background Technology

[0002] The cervical titanium cage fixation device is a core bone grafting and fusion auxiliary device in anterior cervical decompression and fusion surgery. Made primarily of medical-grade titanium alloy, it has a hollow cage-like structure and is implanted into the decompression bone defect area between the cervical vertebrae. It combines three core functions: bone defect filling, intervertebral support, and bone graft fusion carrier, ultimately achieving bony fusion between the cervical vertebrae, restoring the physiological curvature and stability of the cervical spine. It is a commonly used implant in the clinical treatment of cervical disc herniation, vertebral osteophyte formation, cervical fracture-dislocation, and other cervical spine diseases. For example, in prior art 1 (Chinese patent application number CN202120466896.8, application date 2021-03-04), a titanium plate for preventing titanium cage dislocation in anterior cervical surgery, the "convex" structure of the plate and support platform facilitates contact and fixation of the plate against the anterior edge of the cage, thereby preventing cage displacement. Through various... The standardized plate and support platform design facilitates fixation and limitation for different patients and surgical locations, thereby reducing the risk of postoperative complications. The curved design of the plate and support platform increases the structural strength of the device and prevents deformation. For example, in prior art 1 (Chinese patent application number CN201620216441.X, application date 2016-03-21), an internal fixation device for anterior cervical fusion has connecting screw holes on the anterior cervical plate and titanium mesh. In subtotal cervical vertebral resection, especially in multi-segment subtotal cervical vertebral resection, this device can stably connect the anterior cervical plate and titanium mesh without increasing operation time, significantly reducing titanium mesh displacement, reducing complications in anterior cervical surgery, increasing the anterior cervical fusion rate, and greatly improving surgical efficacy. It is worthy of clinical promotion.

[0003] While existing technologies can improve the fixation effect of cervical titanium cages and thus increase the fusion rate of cervical vertebrae, the actual installation and positioning of cervical titanium cages is basically done by directly fixing them with screws. However, during later use by patients, the screws and bolts may loosen or fall off due to shaking, reducing the positioning stability of the cervical titanium cage. Therefore, a cervical titanium cage fixation device has been proposed to effectively solve the above problems. Summary of the Invention

[0004] The purpose of this invention is to provide a cervical titanium cage fixation device to solve the problem mentioned in the background art, which states that in the actual installation and positioning process of cervical titanium cages on the market, they are basically fixed directly by screws. However, during the later use by patients, the screws and bolts may loosen and fall off due to shaking, reducing the positioning stability of the cervical titanium cage.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a cervical spine titanium cage fixation device, comprising a titanium plate and positioning holes at the four corners of the titanium plate. A titanium cage body is embedded in the front side of the titanium plate via two mounting plates, and the titanium cage body is mesh-like. Two rotating seats are rotatably mounted inside the titanium plate, and positioning screws are connected to the interior of the two rotating seats via mounting holes. The rear ends of the two positioning screws extend through to the rear side of the titanium plate. A positioning component is provided inside the rotating seat, which can be used to position and fix the positioning screws after rotation, preventing them from loosening or falling off during later use. A protective component is provided inside the titanium plate, which can provide cushioning and protection for the titanium cage body, reducing stress on the titanium cage body.

[0006] Preferably, the titanium plate and the titanium cage body are designed as a single unit, wherein the titanium plate is in the shape of an arc.

[0007] Preferably, the positioning component includes two positioning blocks, which are slidably mounted inside the rotary base. The outer side of the positioning screw has two positioning grooves, and the positioning grooves and positioning blocks are engaged.

[0008] Preferably, the inner wall of the rotary seat is fixedly connected to one end of two compression springs, and the other end of the two compression springs is fixedly connected to a positioning block.

[0009] Preferably, one end of a polyetheretherketone (PEEK) fiber rope is fixedly connected to the outer side of the two positioning blocks, and the two PEEK fiber ropes have the same structure. The other end of the two PEEK fiber ropes is fixedly connected to two transmission rods through guide wheels provided inside the swivel.

[0010] Preferably, two levers are slidably mounted on the top of the rotary base, and transmission rods are fixedly mounted on the outer ends of the two levers. The two transmission rods are slidably mounted inside the rotary base by a return spring.

[0011] Preferably, one end of two connecting rods is rotatably mounted on the rear side of the mounting plate, and the two connecting rods are inclined, and the other end of the two connecting rods is rotatably connected to a sliding member.

[0012] Preferably, the two sliding members are slidably mounted inside the top plate, and the two sliding members are symmetrically arranged about the transverse center line of the top plate, and the top plate is slidably mounted inside the titanium plate.

[0013] Preferably, one end of two energy storage springs is fixedly connected to the inner wall of the top plate, and the two energy storage springs have the same structure, and the other end of the two energy storage springs is fixedly connected to a sliding member.

[0014] Preferably, the storage spring, compression spring, and return spring have the same structure, and all three are made of medical-grade stainless steel.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: (1) The titanium plate and the titanium cage body are designed as a whole. The titanium plate is designed to fit the arc shape of the cervical vertebrae. The integrated structure eliminates the gap between the titanium plate and the titanium cage body, which greatly improves the overall mechanical stability of the anterior cervical fixation and avoids the risk of loosening and displacement that is easy to occur with the separate design. The arc titanium plate can accurately fit the physiological curvature of the cervical spine, reduce the local friction and stimulation of the soft tissues such as the esophagus and trachea in front of the cervical spine, and reduce the incidence of postoperative swallowing discomfort, aseptic inflammation and other complications.

[0016] (2) It simplifies the surgical implantation process and shortens the operation time. The bone-fitting design of the arc titanium plate can evenly distribute stress along the physiological curvature of the cervical spine, reduce the vertebral bone degeneration caused by local stress concentration, and take into account the fixation reliability, physiological adaptability and surgical operability. It also retains the core function of the hollow bone graft cavity of the titanium cage body, does not affect the filling of bone graft material and bone cell ingrowth, and can also reduce the space occupancy rate, achieving dual optimization of fixation support and bone fusion.

[0017] (3) The design of rotating the positioning screw can flexibly adapt to the implantation needs of different angles in anterior cervical spine surgery during the operation. The titanium cage can be accurately positioned without repeatedly adjusting the overall position of the titanium plate. This not only improves the fit and fixation stability between the titanium cage body and the vertebral body, but also reduces the traction and damage to the surrounding soft tissues, simplifies the surgical procedure, shortens the operation time, and reduces the risk of loosening and displacement of the titanium cage body due to poor angle adaptation, thus creating a more stable initial condition for bone graft fusion.

[0018] (4) When the titanium cage body is installed on the patient's spine, the shaking caused by the patient walking will simultaneously compress and shrink the titanium cage body. At this time, the compressed titanium cage body will simultaneously drive the mounting plate to shrink and move inside the titanium plate. Subsequently, the shrinking titanium cage body will drive the mounting plate to drive the two connecting rods to compress and store the two energy storage springs through the two sliding parts. After the shaking ends, the two energy storage springs after compression and storage will reset the position of the two sliding parts after compression and movement through their own elasticity. At this time, the top plate will drive the two mounting plates to reset the compressed titanium cage body through the two connecting rods, so as to improve the buffer protection performance between the titanium cage body and the patient's cervical vertebrae and reduce the stress shielding of the titanium cage body.

[0019] (5) When it is necessary to position and install the titanium cage body, simply connect the titanium plate to the patient's cervical vertebrae through the titanium cage body, and then rotate and position the two positioning screws at the cone through the mounting holes opened inside the rotator. This will complete the positioning and fixing of the titanium cage body. After the positioning screws are fixed, the two compression springs will automatically spring the two positioning blocks into the positioning grooves opened on both sides of the positioning screws through their own elasticity. This will fix the position of the positioning screws after rotation and prevent the positioning screws from loosening and falling off due to shaking during later use with the patient, thus improving stability.

[0020] (6) When the titanium cage body fails to fuse with the patient's cervical vertebrae and infection occurs, requiring a second surgical adjustment of the titanium cage body, simply press the two levers to drive the two transmission rods to retract and move above the turntable. At this time, the two retracting transmission rods will simultaneously drive the two polyether ether ketone fiber ropes to pull the two positioning blocks through the guide wheels set inside the turntable, causing the positioning blocks to separate from the positioning grooves. Then the positioning screws can be removed from the inside of the turntable, thereby enabling the disassembly of the titanium cage body to facilitate a second surgical adjustment of the titanium cage body, which can improve the fusion rate of the titanium cage body with the patient's cervical vertebrae. Attached Figure Description

[0021] Figure 1 This is a frontal three-dimensional structural diagram of the titanium plate and titanium cage body of the present invention; Figure 2 This is a rear-view three-dimensional structural diagram of the titanium plate and titanium cage body of the present invention; Figure 3 This is a top-view three-dimensional structural diagram of the titanium plate and titanium cage body of the present invention; Figure 4 This is a partial three-dimensional structural diagram of the titanium cage body and top plate of the present invention; Figure 5 For the present invention Figure 4 Enlarged structural diagram at point A in the middle; Figure 6 This is a partial three-dimensional structural diagram of the titanium plate and the rotating base of the present invention; Figure 7 This is a side-view perspective three-dimensional structural diagram of the rotary base and positioning screw of the present invention; Figure 8 This is a partial three-dimensional structural diagram of the rotary base and positioning screw of the present invention; Figure 9 For the present invention Figure 8 Enlarged structural diagram at point B; Figure 10 This is a partial three-dimensional structural diagram of the rotary seat and positioning block of the present invention.

[0022] In the diagram: 1. Titanium plate; 2. Mounting plate; 3. Titanium cage body; 4. Positioning hole; 5. Rotary seat; 6. Positioning screw; 7. Top plate; 8. Connecting rod; 9. Sliding component; 10. Storage spring; 11. Toggle block; 12. Transmission rod; 13. Positioning block; 14. Positioning groove; 15. Compression spring; 16. Polyetheretherketone fiber pull rope; 17. Return spring; 18. Mounting hole. Detailed Implementation

[0023] 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.

[0024] This invention provides the following technical solution: a cervical spine titanium cage fixation device. Example 1 discloses: The titanium plate 1 and positioning holes 4 at its four corners are provided. A titanium cage body 3 is embedded in the front of the titanium plate 1 via two mounting plates 2. The titanium cage body 3 is mesh-like. The titanium plate 1 and the titanium cage body 3 are designed as a single unit. The titanium plate 1 is arc-shaped. This integrated design, which conforms to the arc shape of the cervical vertebrae, eliminates the gap between the separate connections of the titanium plate 1 and the titanium cage body 3, significantly improving the overall mechanical stability of anterior cervical fixation and avoiding the risks of loosening and displacement that are common with separate units. Furthermore, the arc-shaped titanium plate 1 precisely conforms to the cervical spine. The design optimizes the curvature of the cervical spine, reducing local friction and irritation to soft tissues such as the esophagus and trachea, thus lowering the incidence of postoperative complications such as swallowing discomfort and aseptic inflammation. It simplifies the surgical implantation process and shortens the operation time. The bone-fitting design of the arc-shaped titanium plate 1 allows stress to be evenly distributed along the physiological curvature of the cervical spine, reducing vertebral bone degeneration caused by local stress concentration. It balances fixation reliability, physiological adaptability, and surgical operability, while retaining the core function of the hollow bone graft cavity of the titanium cage body 3, without affecting bone graft material filling and bone cell ingrowth. It also reduces space occupancy, achieving dual optimization of fixation support and bone fusion. Figures 1-4 As shown.

[0025] The titanium plate 1 has two rotating seats 5 internally mounted, and the interior of the two rotating seats 5 is connected to positioning screws 6 through mounting holes 18. The rear ends of the two positioning screws 6 extend through to the rear side of the titanium plate 1. The design of rotating seats 5 driving the positioning screws 6 to rotate and adjust allows for flexible adaptation to different angle implantation needs in anterior cervical spine surgery during the operation. It can accurately position the titanium cage without repeatedly adjusting the overall position of the titanium plate 1, which not only improves the fit and fixation stability between the titanium cage body 3 and the vertebral body, but also reduces traction and damage to surrounding soft tissues, simplifies the surgical procedure, shortens the operation time, and reduces the risk of loosening and displacement of the titanium cage body 3 due to poor angle adaptation, thus creating a more stable initial condition for bone graft fusion. Figure 2 and Figure 6 As shown.

[0026] Example 2: To address the issue that in the existing titanium cage body 3, positioning and fixing are primarily achieved through screws, but during later use by the patient, the screws and bolts may loosen and fall off due to shaking, reducing the positioning stability of the titanium cage body 3, the following method is disclosed: The rotary base 5 is internally equipped with a positioning component. This component secures the positioning screw 6 after rotation, preventing it from loosening or falling off during later use. The positioning component includes two positioning blocks 13, which are slidably mounted inside the rotary base 5. Two positioning grooves 14 are formed on the outer surface of the positioning screw 6, and these grooves engage with the positioning blocks 13. Two compression springs 15 are fixedly connected to one end of each other on the inner wall of the rotary base 5, and the other ends of these springs are fixedly connected to the positioning blocks 13. This allows for precise positioning of the titanium cage body 3. During installation, the titanium plate 1 is simply connected to the patient's cervical vertebrae via the titanium cage body 3. Then, two positioning screws 6 are rotated and positioned at the vertebrae through the mounting holes 18 inside the rotating base 5. This completes the positioning and fixing of the titanium cage body 3. Once the positioning screws 6 are fixed, the two compression springs 15 will automatically spring the two positioning blocks 13 into the positioning grooves 14 on both sides of the positioning screws 6 using their own elasticity. This achieves the positioning and fixing of the positioning screws 6 after rotation, preventing them from loosening or falling off during later use with the patient. Figures 8-10 As shown.

[0027] Two positioning blocks 13 are fixedly connected to one end of a polyetheretherketone (PEEK) fiber rope 16 on their outer surfaces. The two PEEK fiber ropes 16 have identical structures. The other ends of the two PEEK fiber ropes 16 are fixedly connected to two transmission rods 12 via guide wheels inside the rotary seat 5. Two levers 11 are slidably mounted on the top of the rotary seat 5, and transmission rods 12 are fixedly mounted on the outer ends of the two levers 11. The two transmission rods 12 are slidably mounted inside the rotary seat 5 via return springs 17. When the titanium cage body 3 fails to fuse with the patient's cervical vertebrae and infection occurs, the titanium cage body 3 needs to be... During the second surgical adjustment, simply press the two levers 11 to retract the two transmission rods 12 above the rotary seat 5. Simultaneously, the two retracting transmission rods 12 will drive the two polyetheretherketone fiber ropes 16 through the guide wheels inside the rotary seat 5, pulling the two positioning blocks 13 to retract and separate them from the positioning grooves 14. Then, the positioning screws 6 can be removed from inside the rotary seat 5, allowing for the disassembly of the titanium cage body 3. This facilitates the second surgical adjustment of the titanium cage body 3, thereby improving the fusion rate between the titanium cage body 3 and the patient's cervical spine. Figures 7-10 As shown.

[0028] Example 3, unlike Example 1, utilizes a buffer component to reduce stress shielding of the titanium cage body 3, thereby improving the fusion rate between the titanium cage body 3 and the patient's cervical spine. The following is disclosed: Two connecting rods 8 are rotatably mounted on the rear side of the mounting plate 2, and the two connecting rods 8 are inclined. The other ends of the two connecting rods 8 are rotatably connected to sliding members 9. The two sliding members 9 are slidably mounted inside the top plate 7, and the two sliding members 9 are symmetrically arranged about the transverse center line of the top plate 7. The top plate 7 is slidably mounted inside the titanium plate 1. Two energy storage springs 10 are fixedly connected to one end of the inner wall of the top plate 7, and the two energy storage springs 10 have the same structure. The other ends of the two energy storage springs 10 are fixedly connected to the sliding members 9. The energy storage springs 10, compression springs 15, and return springs 17 have the same structure. The energy storage springs 10, compression springs 15, and return springs 17 are all made of medical-grade stainless steel. When the titanium cage body 3 is installed on the patient's spine... During bone use, the swaying motion generated by the patient's walking simultaneously compresses and contracts the titanium cage body 3. This compression and contraction of the titanium cage body 3 drives the mounting plate 2 to contract and move within the titanium plate 1. Subsequently, the contracting and moving titanium cage body 3 drives the mounting plate 2 to compress and store force on the two connecting rods 8 via the two sliding parts 9, thus storing force on the two energy storage springs 10. After the swaying stops, the two energy storage springs 10, having stored force, will use their own elasticity to reset the positions of the two sliding parts 9. At this time, the top plate 7, through the two connecting rods 8, drives the two mounting plates 2 to reset the compressed and contracted titanium cage body 3, thereby improving the buffering and protective performance between the titanium cage body 3 and the patient's cervical vertebrae and reducing stress shielding of the titanium cage body 3. Figures 1-5 As shown.

[0029] The above is the entire working process of the device, and all contents not described in detail in this specification are existing technologies known to those skilled in the art.

[0030] The contents not described in detail in this specification are existing technologies known to those skilled in the art. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A cervical spine titanium cage fixation device, comprising a titanium plate (1) and positioning holes (4) opened at the four corners of the titanium plate (1), wherein a titanium cage body (3) is embedded and installed on the front side of the titanium plate (1) through two mounting plates (2), and the titanium cage body (3) is mesh-shaped; Its features are: The titanium plate (1) has two rotating seats (5) inside, and the interior of the two rotating seats (5) is connected to the positioning screws (6) through the opening of the mounting holes (18), and the rear ends of the two positioning screws (6) extend through to the rear side of the titanium plate (1). The rotating base (5) is equipped with a positioning component inside. The positioning component can be used to position and fix the positioning screw (6) after rotation and positioning, so as to prevent the positioning screw (6) from loosening and falling off during later use. The titanium plate (1) is equipped with a protective component inside, which can buffer and protect the titanium cage body (3) and reduce the stress shielding of the titanium cage body (3).

2. The cervical spine titanium cage fixation device according to claim 1, characterized in that: The titanium plate (1) and the titanium cage body (3) are designed as a single unit, wherein the titanium plate (1) is in the shape of an arc.

3. The cervical spine titanium cage fixation device according to claim 1, characterized in that: The positioning assembly includes two positioning blocks (13), which are slidably mounted inside the rotating base (5). The outer side of the positioning screw (6) has two positioning grooves (14), and the positioning grooves (14) and the positioning blocks (13) are engaged.

4. The cervical spine titanium cage fixation device according to claim 1, characterized in that: The inner wall of the rotating seat (5) is fixedly connected to one end of two compression springs (15), and the other end of the two compression springs (15) is fixedly connected to a positioning block (13).

5. The cervical spine titanium cage fixation device according to claim 4, characterized in that: The outer sides of the two positioning blocks (13) are fixedly connected to one end of the polyether ether ketone fiber pull rope (16), and the two polyether ether ketone fiber pull ropes (16) have the same structure. The other end of the two polyether ether ketone fiber pull ropes (16) is fixedly connected to two transmission rods (12) through the guide wheel set inside the swivel (5).

6. The cervical spine titanium cage fixation device according to claim 1, characterized in that: Two levers (11) are slidably mounted on the top of the rotary seat (5), and transmission rods (12) are fixedly mounted on the outer ends of the two levers (11). The two transmission rods (12) are slidably mounted inside the rotary seat (5) by means of a return spring (17).

7. The cervical spine titanium cage fixation device according to claim 1, characterized in that: The rear side of the mounting plate (2) is rotatably mounted with one end of two connecting rods (8), and the two connecting rods (8) are inclined, and the other end of the two connecting rods (8) is rotatably connected to a sliding member (9).

8. The cervical spine titanium cage fixation device according to claim 7, characterized in that: The two sliding members (9) are slidably mounted inside the top plate (7), and the two sliding members (9) are symmetrically arranged about the transverse center line of the top plate (7), and the top plate (7) is slidably mounted inside the titanium plate (1).

9. The cervical spine titanium cage fixation device according to claim 8, characterized in that: The inner wall of the top plate (7) is fixedly connected to one end of two energy storage springs (10), and the two energy storage springs (10) have the same structure. The other end of the two energy storage springs (10) is fixedly connected to a sliding member (9).

10. The cervical spine titanium cage fixation device according to claim 9, characterized in that: The energy storage spring (10), compression spring (15) and return spring (17) have the same structure, and the energy storage spring (10), compression spring (15) and return spring (17) are all made of medical stainless steel.

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