A combined integrated anti-subsidence anterior cervical fusion system

Abstract

The present invention discloses a combined integrated anti-subsidence anterior cervical fusion system, which relates to the field of medical device technology. It includes: an internal fixation plate, the four corner positions of the internal fixation plate are provided with through holes, and the center position of the internal fixation plate is provided with a mounting hole; an intervertebral fusion device, the intervertebral fusion device is connected to the internal fixation plate, the intervertebral fusion device is connected to the middle position of the internal fixation plate, and the intervertebral fusion device is provided with a threaded hole; a conical screw, the conical screw passes through the mounting hole on the internal fixation plate and is threadedly connected to the intervertebral fusion device; a bone screw, the bone screw is provided at the through hole, and is used to fix the internal fixation plate. The present invention can achieve the technical effects of facilitating intraoperative operation, reducing operation time and facilitating installation by arranging a threaded connection between the intervertebral fusion device and the internal fixation plate, while reducing stress shielding and asynchronous secondary subsidence caused by different elastic moduli after surgery. At the same time, it reduces the formation of postoperative artifacts.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and more particularly to a combined integrated anti-subsidence anterior cervical fusion system. Background Art

[0002] Cervical spondylosis is common in middle-aged and elderly patients. Cervical spondylotic myelopathy (CSM) is caused by degeneration of the cervical intervertebral disc, which leads to compression of the spinal cord and / or obstruction of the spinal cord blood supply at that segment. Conservative treatment is generally ineffective, and the disease progressively worsens. Because much of the pressure on CSM originates primarily from the anterior spinal cord, such as osteophytes at the posterior margin of the vertebral bodies and intervertebral disc tissue, anterior cervical decompression and bone grafting and fusion are increasingly used in clinical practice. Reconstruction after adequate decompression is crucial to ensuring surgical effectiveness. The anterior cervical plate has good immediate stability and tension load effect. Its function is to act as a tension band when the cervical spine is extended, and to support the plate when the cervical spine is flexed, so that the physiological flexion and height of the cervical spine can be maintained. When used in conjunction with an intervertebral fusion device, the maintenance of intervertebral height not only expands the intervertebral foramen, but also restores the tension of the surrounding soft tissue, so that the posterior longitudinal ligament of the diseased segment is adducted into the vertebral body under the longitudinal force supported by internal fixation, reducing the wrinkles of the ligament during neck movement, further achieving the purpose of decompression, thereby avoiding secondary nerve damage caused by loss of intervertebral height or collapse of the intervertebral space, and reducing the rate of reoperation.

[0003] At present, most anterior cervical spine surgeries use traditional steel plates for fixation, most of which are non-locking steel plates. Their main materials are inert metals or alloy materials. While obtaining good rigidity and support, their large elastic modulus often leads to stress shielding. At the same time, bone grafting and fusion after cervical disc removal or subtotal vertebral body resection are generally supplemented with intervertebral fusion devices or titanium cages filled with autologous or allogeneic cancellous bone made of polyetheretherketone material. Since the cervical vertebral body is small, the screw length is limited, usually 12-14mm, and in order to avoid further compression of the spinal cord from the back, double cortical fixation is generally not selected. Secondary settlement often occurs within a period of time after fixation, and screw loosening or withdrawal is inevitable. In severe cases, soft tissue damage in front of the vertebral body, such as trachea and esophagus, may occur.

[0004] In this context, some researchers have sought to improve internal fixation devices. In 1986, Morscher et al. first used the AO cervical locking plate. This system connects the plate, screws, vertebral body, and bone graft into a solid whole, reducing the risk of screw loosening and slippage. This system enhances cervical stability, improves bone graft fusion rates, and effectively maintains the intervertebral height and physiological curvature of the cervical spine, greatly improving surgical safety. However, although the cervical locking plate is a strong internal fixation device, its design does not consider stress shielding. When asynchronous settlement occurs between screw stress and vertebral support, the risk of overall internal fixation failure increases significantly. Furthermore, with the increase in segmental resections performed during anterior cervical surgery, the cervical spine loses stability and blood supply, increasing the incidence of internal fixation complications. This can lead to complications such as loss of intervertebral space and vertebral height, pseudoarthrosis, and kyphosis.

[0005] Therefore, how to provide a combined, integrated, anti-settling anterior cervical fusion system that is anti-settling and has uniform force and good stability is an urgent problem that needs to be solved by those skilled in the art. Summary of the Invention

[0006] In view of this, the present invention provides a combined integrated anti-subsidence anterior cervical fusion system, which aims to solve the problems in the above-mentioned background technology, and prevent the intervertebral fusion cage from subsiding when fixing the cervical spine and the intervertebral fusion cage, and has uniform force and good stability.

[0007] In order to achieve the above object, the present invention adopts the following technical solutions:

[0008] An inner fixing plate, wherein the four corner positions of the inner fixing plate are each provided with through holes, and the center position of the inner fixing plate is provided with a mounting hole;

[0009] An intervertebral fusion cage, the intervertebral fusion cage is arranged in the middle position of the internal fixation plate, and the intervertebral fusion cage is provided with a threaded hole;

[0010] a conical screw passing through the mounting hole on the internal fixation plate and being threadedly connected to the threaded hole on the intervertebral fusion cage;

[0011] A bone screw is arranged at the through hole and is used to fix the internal fixation plate.

[0012] Furthermore, the internal fixation plate is a rectangular plate, and the cross section of the internal fixation plate is an arc-shaped structure with both ends bent toward the intervertebral fusion cage.

[0013] Furthermore, the intervertebral fusion cage has a U-shaped structure, and the opening of the intervertebral fusion cage faces the internal fixation plate.

[0014] Furthermore, at the position where the internal fixation plate and the intervertebral fusion cage contact each other, the internal fixation plate is provided with a groove for mortise and tenon connection, and the intervertebral fusion cage is provided with a protrusion for mortise and tenon connection, and the mortise and tenon connection between the internal fixation plate and the intervertebral fusion cage is achieved through the cooperation between the groove and the protrusion.

[0015] Furthermore, the diameter of the threaded hole is the same as the end diameter of the screw-in end of the conical screw, and the diameter of the conical screw gradually increases from the end diameter of the screw-in end to the other end.

[0016] Furthermore, the internal fixation plate and the intervertebral fusion cage are both made of a resin composition consisting of polyetherketone resin and fluororesin, the mass ratio of the polyetherketone resin and the fluororesin in the composition is 95:5 to 50:50, and the average dispersed particle size of the fluororesin is less than 0.30 μm.

[0017] The above technical solution demonstrates that, compared to existing technologies, the present invention provides a combined, integrated, anti-subsidence anterior cervical fusion system. By threading the intervertebral fusion cage and internal fixation plate, this system facilitates intraoperative manipulation, reduces surgical time, and facilitates installation. It also reduces postoperative stress shielding and internal fixation failure caused by asynchronous secondary subsidence due to differences in elastic modulus, and reduces postoperative artifacts. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are merely embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0019] Figure 1 The present invention provides an installation diagram of a combined integrated anti-subsidence anterior cervical fusion system;

[0020] Figure 2 The present invention provides a front view of a combined integrated anti-subsidence anterior cervical fusion system internal fixation plate;

[0021] Figure 3 A left view of an internal fixation plate in a combined integrated anti-subsidence anterior cervical fusion system provided by the present invention;

[0022] Figure 4 A schematic diagram of an intervertebral fusion device for a combined integrated anti-subsidence anterior cervical fusion system provided by the present invention;

[0023] Figure 5A schematic diagram of a tapered screw for a combined integrated anti-subsidence anterior cervical fusion system provided by the present invention.

[0024] Among them: 1 is an internal fixation plate; 11 is a through hole; 12 is a mounting hole; 2 is an intervertebral fusion cage; 21 is a threaded hole; 3 is a tapered screw; and 4 is a bone screw. DETAILED DESCRIPTION

[0025] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0026] See also Figure 1-5 The embodiment of the present invention discloses a combined integrated anti-subsidence anterior cervical fusion system, comprising:

[0027] The internal fixation plate 1 has through holes 11 at the four corners and a mounting hole 12 at the center. In this embodiment, the internal fixation plate 1 is used to fit the cervical vertebra and fix the intervertebral fusion cage 2 on the affected part of the cervical vertebra.

[0028] An intervertebral fusion cage 2 is provided in the middle of the internal fixation plate 1 and is provided with a threaded hole 21;

[0029] The conical screw 3 passes through the mounting hole 12 on the internal fixation plate 1 and is threadedly connected to the threaded hole 21 on the intervertebral fusion cage 1;

[0030] The bone screw 4 is arranged at the through hole 11 and is used to fix the internal fixation plate 1. During fixation, the bone screw 4 passes through the internal fixation plate 1 and is screwed onto the cervical vertebra.

[0031] The internal fixation plate 1 is a rectangular plate. The cross section of the internal fixation plate 1 is an arc-shaped structure with both ends bent toward the intervertebral fusion cage 2. In this embodiment, the sharp corners of the internal fixation plate 1 are chamfered.

[0032] The intervertebral fusion device 2 has a U-shaped structure, and the opening of the intervertebral fusion device 2 faces the internal fixation plate 1. At the position where the internal fixation plate and the intervertebral fusion device contact each other, the internal fixation plate is provided with a groove for mortise and tenon connection, and the intervertebral fusion device is provided with a protrusion for mortise and tenon connection, and the mortise and tenon connection between the internal fixation plate and the intervertebral fusion device is achieved through the cooperation of the groove and the protrusion. The mortise and tenon connection between the internal fixation plate 1 and the intervertebral fusion device 2 is convenient for intraoperative operation, reduces surgical time, and facilitates installation. At the same time, it reduces stress shielding and asynchronous secondary sinking caused by different elastic moduli after surgery. At the same time, it reduces the formation of postoperative artifacts and facilitates postoperative follow-up and evaluation. The diameter of the threaded hole 21 is the same as the end diameter of the screw-in end of the conical screw 3, and the conical screw 2 gradually increases from the end diameter of the screw-in end to the diameter of the other end.

[0033] When the intervertebral fusion cage 2 is in use, the tapered screw 3 is screwed into the interior of the intervertebral fusion cage 2, and the U-shaped structure of the intervertebral fusion cage 2 is expanded due to the increase in the diameter of the tapered screw 3, forming a further mortise and tenon fixation between the intervertebral fusion cage 2 and the internal fixation plate 1. At the same time, the intervertebral fusion cage 2 located in the vertebral body also gradually forms a wedge-shaped change with a higher front and a lower back, further improving and reconstructing the physiological curvature of the cervical lordosis, and appropriately expanding the intervertebral space, further decompressing the posterior intervertebral foramen, and finally fixing the head and tail ends of the internal fixation plate 1 in the middle of the vertebral body to maintain the obtained decompression and correction effects.

[0034] Both the internal fixation plate 1 and the intervertebral fusion device 2 are made from a resin composition consisting of polyetherketone resin and fluororesin. The mass ratio of the polyetherketone resin and fluororesin in the composition is 95:5 to 50:50, and the average dispersed particle size of the fluororesin is less than 0.30 μm. This material has a modulus similar to that of cortical bone. By maintaining normal stress in the surrounding bone tissue, it can minimize the impact of implanted devices on bone density. Compared with unmodified polyetheretherketone, it has higher strength, making it an excellent choice for structural, load-bearing, and implantable medical devices used in spinal surgery. Due to its high strength, the size of the implantable device can be reduced, reducing the prevertebral space-occupying effect of the material implant, thereby achieving a lower notch and being tissue-friendly. At the same time, this polyetheretherketone material also has excellent creep resistance and can withstand long-term fatigue stress.

[0035] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. Reference can be made to the common and similar parts between the various embodiments. For the devices disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple, and the relevant parts can be referred to the method description.

[0036] The above description of the disclosed embodiments is intended to enable one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not limited to the embodiments shown herein but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A combined integrated anti-subsidence anterior cervical fusion system, characterized by: include: An inner fixing plate, wherein the four corner positions of the inner fixing plate are each provided with through holes, and the center position of the inner fixing plate is provided with a mounting hole; An intervertebral fusion cage, the intervertebral fusion cage is arranged in the middle position of the internal fixation plate, and the intervertebral fusion cage is provided with a threaded hole; a conical screw passing through the mounting hole on the internal fixation plate and being threadedly connected to the threaded hole on the intervertebral fusion cage; a bone screw, the bone screw being arranged at the through hole and being used for fixing the internal fixation plate; The intervertebral fusion cage is in a U-shaped structure, and the opening of the intervertebral fusion cage faces the internal fixation plate; At the position where the internal fixation plate and the intervertebral fusion cage contact each other, the internal fixation plate is provided with a groove for mortise and tenon connection, and the intervertebral fusion cage is provided with a bump for mortise and tenon connection, and the mortise and tenon connection between the internal fixation plate and the intervertebral fusion cage is achieved through the cooperation between the groove and the bump; The diameter of the threaded hole is the same as the end diameter of the tapered screw's screw-in end, and the diameter of the tapered screw gradually increases from the end diameter of the screw-in end to the other end; When the intervertebral fusion device is in use, the tapered screw is screwed into the interior of the intervertebral fusion device, and the increase in the diameter of the tapered screw expands the U-shaped structure of the intervertebral fusion device, forming a further mortise and tenon fixation between the intervertebral fusion device and the internal fixation plate. At the same time, the intervertebral fusion device located in the vertebral body also gradually forms a wedge-shaped change with a higher front and a lower back, further improving and reconstructing the physiological curvature of the cervical lordosis, and appropriately expanding the intervertebral space, further decompressing the posterior intervertebral foramen.

2. The combined integrated anti-subsidence anterior cervical fusion system according to claim 1, characterized in that: The internal fixation plate is a rectangular plate, and the cross section of the internal fixation plate is an arc-shaped structure with both ends bent toward the intervertebral fusion cage.

3. The combined integrated anti-subsidence anterior cervical fusion system according to claim 1, characterized in that: The internal fixation plate and the intervertebral fusion cage are both made of a resin composition consisting of polyetherketone resin and fluororesin. The mass ratio of the polyetherketone resin and the fluororesin in the composition is 95:5 to 50:50, and the average dispersed particle size of the fluororesin is less than 0.30 μm.

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