Spinal fusion internal fixation system capable of preventing adjacent segment degeneration and use method

Abstract

The invention discloses a spinal fusion internal fixation system capable of preventing adjacent segment degeneration, which comprises a PEEK rod, a CBT screw group, a connecting rod, a pedicle screw group and a connecting piece, the CBT screw group is arranged above the pedicle screw group, the top end of the PEEK rod is fixed with an adjacent segment centrum through the CBT screw group, and the connecting rod is connected with the pedicle screw group through the connecting piece. And the bottom end of the PEEK rod is connected with the top end of the fusion segment connecting rod through a connecting piece or is directly connected with a stud screw at the top end of the fusion segment screw-rod system, so that the PEEK rod is connected and fixed with the fusion segment vertebral body screw-rod system. Compared with the prior art, the spine fusion internal fixation system has remarkable superiority in the aspects of preventing adjacent segment degeneration, improving stability, reducing complication risks, simulating spine natural bending and load distribution, allowing movement to a certain degree, reducing damage to tissues, providing stronger fixation and the like.

Description

Technical Field

[0001] The present invention relates to the technical field of orthopedic medical devices, and particularly to a spinal fusion internal fixation system capable of preventing adjacent segment degeneration and a using method thereof. Background Art

[0002] Spinal internal fixation fusion surgery aims to treat spinal diseases, such as degenerative diseases, deformities, fractures and dislocations, by stabilizing the spine, relieving pain and correcting deformities to prevent the progression of the disease. This surgery uses an internal fixation system composed of pedicle screws and connecting rods. The screws penetrate the pedicle and are fixed in the vertebral body, and are connected to the metal connecting rod to form a rigid framework, effectively restricting abnormal spinal movement, bearing daily mechanical loads, and preventing the spine from being damaged again or the deformity from worsening. However, adjacent segment degeneration after spinal fusion is a common and troublesome complication. Since the fusion surgery restricts the natural movement of the spine, the adjacent segments may degenerate more rapidly due to increased compensatory movement, which may lead to new symptoms such as pain and instability, affecting the prognosis of the patient. In view of this, spinal non-fusion techniques have emerged, aiming to achieve spinal stability and function preservation through a series of devices and techniques, such as dynamic stabilization devices. Such techniques can not only effectively relieve the symptoms of patients, but also maintain the natural movement characteristics of the spine to the greatest extent, thereby reducing the risk of adjacent segment diseases and improving the quality of life of patients. Commonly used non-fusion techniques include dynamic stabilization devices, artificial disc replacement, and elastic PEEK rods.

[0003] Common dynamic stabilization devices include the Wallis and Coflex systems. They reduce the excessive movement above and below the spinal fusion segment, reduce the burden on adjacent segments, and reduce the risk of degeneration. The Wallis system is an interspinous process internal fixator, using a polyetheretherketone spacer, which matches the elastic modulus of the posterior lumbar structure, restricts hyperextension and bears pressure. The Coflex system is a titanium alloy U-shaped structure with elasticity, allowing 50° - 100° flexion and extension, enhancing spinal stability, especially rotational stability. Both have their own advantages and are aimed at maintaining spinal physiological activities. The use of dynamic stabilization devices may cause some complications, such as internal fixation loosening, spinous process fracture, recurrence of degenerative diseases, heterotopic ossification, etc. These problems may require the patient to undergo reoperation. Artificial disc replacement is a new method for treating lumbar disc degenerative diseases. By implanting an artificial disc to replace the diseased part, it aims to restore spinal stability and movement function. Its advantages include retaining most of the original disc function, rapid relief of clinical symptoms, and low recurrence rate. However, this surgery also has disadvantages such as insecure fixation, increased wear of the artificial disc, and possible vertebral instability. Therefore, the application of artificial disc replacement has gradually decreased.

[0004] In contrast, the use of dynamic rod fixation technology can also preserve intervertebral movement while stabilizing the lumbar spine, reduce the load on adjacent segments, replace the metal connecting rod with a polyetheretherketone (PEEK) connecting rod. The elastic modulus of the PEEK rod is close to that of bone, which helps to reduce the stress shielding effect. The PEEK rod allows a certain degree of movement, helps to maintain the natural load transfer of the spine, and reduces the risk of degeneration of adjacent segments. It is gradually becoming the mainstream non-fusion technology in clinical practice. However, there are still some defects that need to be overcome in this technology: for example, osteoporotic vertebral bodies have insufficient holding power for pedicle screws, and the internal fixation system cannot effectively stabilize the lumbar spine, resulting in a significant increase in the incidence of loosening.

[0005] In view of the current trend of PEEK rod application and its existing defects in spinal non-fusion technology, it is particularly urgent to develop a new type of spinal fusion internal fixation system based on PEEK rod that can prevent adjacent segment degeneration. This system aims to optimize the properties of PEEK material, enhance fixation stability, reduce complications, while preserving the natural movement function of the spine and effectively reducing the risk of adjacent segment degeneration. This innovative technology will meet clinical needs, improve the quality of life of patients, and promote the technological progress and development in the field of spinal surgery.

[0006] Therefore, there is an urgent need for a spinal fusion internal fixation system that can prevent adjacent segment degeneration. Summary of the Invention

[0007] The present invention provides a spinal fusion internal fixation system that can prevent adjacent segment degeneration, which solves the problem that the internal fixation system of the PEEK rod in osteoporotic vertebral bodies cannot effectively stabilize the lumbar spine, leading to adjacent segment degeneration. On the other hand, the present invention provides an installation method for a spinal fusion internal fixation system that can prevent adjacent segment degeneration.

[0008] In the first aspect of the present invention, there is provided a spinal fusion internal fixation system that can prevent adjacent segment degeneration, including a PEEK rod, a CBT screw group, a connecting rod, a pedicle screw group, and a connecting member. The CBT screw group is arranged above the pedicle screw group. The top end of the PEEK rod is fixed to the vertebral body of the adjacent segment through the CBT screw group. The bottom end of the PEEK rod is connected to the top end of the connecting rod through the connecting member. The bottom end of the connecting rod is fixed to the vertebral body of the fusion segment through the pedicle screw group, so as to realize the parallel connection of the PEEK rod and the connecting rod.

[0009] The spinal fusion internal fixation system capable of preventing adjacent segment degeneration. Preferably, the pedicle screw group includes a first pedicle screw group and a second pedicle screw group. The CBT screw group, the first pedicle screw group, and the second pedicle screw group are arranged in sequence from top to bottom. The top end of the connecting rod is connected to the first pedicle screw group. Among them, the CBT screw group includes two CBT screws arranged in parallel. Both the first pedicle screw group and the second pedicle screw group include two pedicle screws arranged in parallel. The connecting member is a domino joint. The bottom end of the PEEK rod is connected to the middle part of the connecting rod through the domino joint to make the PEEK rod and the connecting rod arranged in parallel.

[0010] The spinal fusion internal fixation system capable of preventing adjacent segment degeneration. Preferably, the CBT screw group includes two CBT screws arranged in parallel. The pedicle screw group includes two pedicle screws arranged in parallel. The connecting member is a parallel double-headed screw. The bottom end of the PEEK rod is connected to the top end of the connecting rod through the parallel double-headed screw to make the PEEK rod and the connecting rod arranged in parallel.

[0011] The second aspect of the present invention provides an installation method for a spinal fusion internal fixation system capable of preventing adjacent segment degeneration, including the spinal fusion internal fixation system capable of preventing adjacent segment degeneration, specifically including the following steps:

[0012] On the vertebral bodies of adjacent segments, place the CBT screw group. On the vertebral bodies of the fusion segment, place the first pedicle screw group and the second pedicle screw group. The CBT screw group, the first pedicle screw group, and the second pedicle screw group are arranged in sequence from top to bottom. Among them, the CBT screw group includes two CBT screws arranged in parallel. Both the first pedicle screw group and the second pedicle screw group include two pedicle screws arranged in parallel;

[0013] Connect the top ends of two PEEK rods to the CBT screw group;

[0014] Connect the top ends of two connecting rods to the first pedicle screw group respectively;

[0015] Connect the bottom ends of two PEEK rods to the middle part of the connecting rod through domino joints;

[0016] Connect the bottom ends of two said connecting rods to the second pedicle screw group.

[0017] The third aspect of the present invention provides an installation method for a spinal fusion internal fixation system capable of preventing adjacent segment degeneration, including the spinal fusion internal fixation system capable of preventing adjacent segment degeneration, specifically including the following steps:

[0018] On adjacent segment vertebrae, a CBT screw group is implanted. On the vertebrae of the fusion segment, a pedicle screw group is implanted. Among them, the CBT screw group is arranged above the pedicle screw group. The CBT screw group includes two CBT screws arranged in parallel. The pedicle screw group includes two pedicle screws arranged in parallel;

[0019] Connect the tops of two PEEK rods to the CBT screw group;

[0020] Connect the bottoms of two PEEK rods to the tops of two connecting rods through parallel double-headed screws;

[0021] Connect the bottoms of two connecting rods to the pedicle screw group.

[0022] In a fourth aspect of the present invention, a spinal fusion internal fixation system capable of preventing adjacent segment degeneration includes PEEK rods, a CBT screw group, connecting rods and connectors. The CBT screw group includes a first CBT screw group and a second CBT screw group. The top of the PEEK rod is fixed to the adjacent segment vertebrae through the first CBT screw group. The bottom of the PEEK rod is connected to the top of the connecting rod through the connector. The bottom of the connecting rod is fixed to the vertebrae of the fusion segment through the second CBT screw group to achieve that the PEEK rod and the connecting rod are longitudinally arranged in a row. Among them, both the first CBT screw group and the second CBT screw group include two CBT screws arranged in parallel.

[0023] For the spinal fusion internal fixation system capable of preventing adjacent segment degeneration, preferably, the connector is a series double-headed CBT screw. The bottom of the PEEK rod is connected to the top of the connecting rod through the series double-headed CBT screw to form the PEEK rod and the connecting rod longitudinally arranged in a row.

[0024] In a fifth aspect of the present invention, a method for installing a spinal fusion internal fixation system capable of preventing adjacent segment degeneration is provided, including the spinal fusion internal fixation system capable of preventing adjacent segment degeneration, specifically including the following steps:

[0025] On adjacent segment vertebrae, implant the first CBT screw group. On the vertebrae of the fusion segment, implant the connector and the second CBT screw group. The first CBT screw group is located above the connector and the second CBT screw group. Among them, both the first CBT screw group and the second CBT screw group include two CBT screws arranged in parallel. The connector includes two series double-headed CBT screws arranged in parallel;

[0026] Connect the tops of two PEEK rods to the first CBT screw group;

[0027] The bottom ends of two PEEK rods are connected to the top ends of two connecting rods through series double-headed CBT screws;

[0028] The bottom ends of the two connecting rods are connected to the second CBT screw group.

[0029] The beneficial effects are as follows:

[0030] 1. The CBT screw can penetrate through a thicker cortical bone layer into the vertebral body, providing higher initial stability. By passing through more cortical bone, the CBT screw can better resist the pull-out force, thereby reducing the risk of loosening. The CBT screw can be inserted along the inner wall of the pedicle rather than the outer wall, reducing the risk of penetrating the cortical bone of the pedicle, thus reducing the risk of nerve injury or other complications. At the same time, the thread design of the CBT screw is more dense, which can provide better grip in softer bone, making it more beneficial to use in osteoporotic patients, thereby improving the stability of the entire internal fixation system.

[0031] 2. The PEEK rod has an elastic modulus similar to that of human cortical bone, which can better simulate the natural curvature and load distribution of the spine, thereby reducing the pressure on adjacent unfused segments. The elastic modulus of traditional metal materials is too high, which may cause adjacent segment degeneration.

[0032] 3. The PEEK rod has a certain flexibility, which can maintain or restore the normal curve of the spine, while allowing a certain degree of movement to reduce the stiffness of adjacent segments. This flexibility can reduce the additional stress on adjacent vertebral bodies, help maintain normal spinal movement, and thus reduce the premature degeneration of adjacent segments.

[0033] 4. Traditional pedicle screws may cause problems such as pedicle fractures and nerve injuries. The CBT screw of the present invention is designed to be inserted along the inner wall of the pedicle, reducing the risk of penetrating the cortical bone of the pedicle, thereby reducing the possibility of nerve injury or other complications.

[0034] 5. The present invention can reduce tissue damage. The CBT screw causes less tissue damage than Coflex, which helps reduce the inflammatory response and pain of tissues after surgery and promotes the recovery of patients.

[0035] 6. For areas where it is difficult to implant traditional pedicle screws (such as scoliosis, spondylolisthesis, etc.), through various combinations of screws and PEEK rods, the curved and narrow areas can be avoided to provide stronger fixation.

[0036] 7. It can be used for the revision of traditional internal fixation. The CBT screw insertion point is more towards the inner lower part. The screw's running trajectory in the vertebral body mainly passes through the cortical bone area, which can provide more reliable fixation in revision cases, reduce excessive pressure on the local bone mass, reduce the risk of screw loosening, and lower the risk of reoperation failure.

[0037] 8. The present invention is applicable to a variety of surgical procedures, such as transforaminal lumbar interbody fusion (TLIF), oblique lateral lumbar interbody fusion (OLIF), posterior lumbar interbody fusion (PLIF), midline lumbar interbody fusion (MIDLIF), minimally invasive transforaminal lumbar interbody fusion (MISTLIF), etc.

[0038] The spinal fusion internal fixation system of the present invention has significant advantages over the prior art in preventing adjacent segment degeneration, improving stability, reducing the risk of complications, simulating the natural curvature and load distribution of the spine, allowing a certain degree of movement, reducing tissue damage, and providing stronger fixation. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 It is a schematic structural diagram of Embodiment 1 of the present invention;

[0040] Figure 2 It is a schematic structural diagram of Embodiment 2 of the present invention;

[0041] Figure 3 It is a schematic structural diagram of Embodiment 3 of the present invention.

[0042] In the figure:

[0043] 1, CBT screw; 2, set screw; 3, PEEK rod; 4, reset plug; 5, domino joint;

[0044] 6-1, first pedicle screw; 6-2, second pedicle screw; 6-3, third pedicle screw;

[0045] 6-4, fourth pedicle screw; 6-5, fifth pedicle screw; 6-6, sixth pedicle screw;

[0046] 7, connecting piece; 8, parallel double-headed screw; 9, series double-headed CBT screw. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0047] To make the objectives, technical solutions, and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art without creative efforts based on the embodiments of the present invention fall within the scope of protection of the present invention.

[0048] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by terms such as "upper" and "lower" is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the system or component referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention. In addition, the use of terms such as "first" and "second" to limit components is only for the convenience of differentiating the above components. Without further declaration, the above terms have no special meaning and should not be construed as indicating or implying relative importance.

[0049] In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, the terms "installation", "setting", and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0050] A spinal fusion internal fixation system capable of preventing adjacent segment degeneration provided by the present invention includes a PEEK rod, a CBT screw group (Cortical Bone Trajectory, CBT, that is, cortical bone trajectory screw), a connecting rod, a pedicle screw group, and a connecting piece. The CBT screw group is arranged above the pedicle screw group. The top end of the PEEK rod is fixed to the adjacent segment vertebra through the CBT screw group, and the bottom end of the PEEK rod is connected in parallel with the connecting rod of the fusion segment. The spinal fusion internal fixation system of the present invention has significant advantages over the prior art in aspects such as preventing adjacent segment degeneration, improving stability, reducing the risk of complications, simulating the natural curvature and load distribution of the spine, allowing a certain degree of movement, reducing tissue damage, and providing stronger fixation.

[0051] The following takes a spinal fusion internal fixation system capable of preventing adjacent segment degeneration as an example to elaborate on the entire technical process in detail.

[0052] Example 1

[0053] As Figure 1As shown in the figure, a spinal fusion internal fixation system for preventing adjacent segment degeneration includes a PEEK rod 3, a CBT screw group, a connecting rod 7, a first pedicle screw group, a second pedicle screw group, and a connecting piece. Among them, the CBT screw group, the first pedicle screw group, and the second pedicle screw group are arranged in sequence from top to bottom. The top end of the connecting rod 7 is connected to the first pedicle screw group. Among them, the CBT screw group includes two CBT screws 1 arranged side by side. The first pedicle screw group includes a first pedicle screw 6-1 and a second pedicle screw 6-2. The second pedicle screw group includes a third pedicle screw 6-3 and a fourth pedicle screw 6-4. The connecting piece is a domino joint 5. The bottom end of the PEEK rod 3 is connected to the middle part of the connecting rod 7 through the domino joint 5 to make the PEEK rod 3 and the connecting rod 7 arranged side by side.

[0054] Among them, a set screw 2 is provided on the CBT screw 1, and a reset plug 4 is provided on each of the first pedicle screw 6-1, the second pedicle screw 6-2, the third pedicle screw 6-3, the fourth pedicle screw 6-4, and the domino joint 5.

[0055] The domino joint combined with the cortical bone trajectory screw type is mainly suitable for the following situations:

[0056] 1. Preventing adjacent segment degeneration

[0057] 2. Multi-segment spinal diseases

[0058] When a patient has multi-segment spinal degenerative diseases, such as herniated discs and spinal stenosis in multiple segments, and extensive internal fixation and fusion are required, the domino connection can effectively connect multiple fixed segments to provide stable fixed support. It can evenly disperse stress, reduce the load on a single fixed point, and reduce the risk of internal fixation failure.

[0059] 3. Correcting complex spinal deformities

[0060] For severe spinal deformities, such as scoliosis and kyphosis, surgical correction often involves multiple vertebral bodies. The domino connection can help achieve multi-segment precise fixation and fusion during the complex deformity correction process. It can better adapt to the irregular shape of the deformed vertebral bodies and improve the stability and correction effect of internal fixation.

[0061] 4. Revision surgery

[0062] In the revision surgery of spinal internal fixation and fusion, due to possible loosening, fracture, or other problems in the original internal fixation structure, re-fixation and fusion are required. The domino connection can be used as an effective connection method to combine with the original fixation system or new internal fixation instruments to provide reliable fixed support and promote the success of fusion.

[0063] Example 2

[0064] As Figure 2 shown, a spinal fusion internal fixation system for preventing adjacent segment degeneration includes a PEEK rod 3, a CBT screw group, a connecting rod 7, a pedicle screw group and a connecting member. The CBT screw group includes two juxtaposed CBT screws 1. The pedicle screw group includes a fifth pedicle screw 6-5 and a sixth pedicle screw 6-6. The connecting member is a parallel double-headed screw 8. The bottom end of the PEEK rod 3 is connected to the top end of the connecting rod 7 through the parallel double-headed screw 8 to make the PEEK rod 3 and the connecting rod 7 juxtaposed.

[0065] Among them, a setscrew 2 is provided on the CBT screw 1, and a reset plug 4 is provided on both the fifth pedicle screw 6-5 and the sixth pedicle screw 6-6 and the parallel double-headed screw 8.

[0066] The parallel double-headed screw combined with the cortical bone trajectory screw type is mainly suitable for the following situations:

[0067] 1. Preventing adjacent segment degeneration

[0068] Based on the cortical bone screw, the development of the parallel double-headed screw combined with the cortical bone trajectory screw has the effect of increasing the resistance to proximal junction failure on the basis of the inherent strengthening of osteoporosis fixation by the cortical bone screw

[0069] 2. Situations requiring multi-planar fixation

[0070] In some special cases, such as spinal deformity correction, multi-segment fusion, etc., fixation needs to be performed in multiple planes. The parallel double-headed screw can provide fixing force in different directions to meet the needs of multi-planar fixation. It can be used in combination with other internal fixation instruments to achieve three-dimensional fixation and improve the stability and fusion effect of the spine.

[0071] Example 3

[0072] As Figure 3 shown, a spinal fusion internal fixation system for preventing adjacent segment degeneration includes a PEEK rod 3, a first CBT screw group, a second CBT screw group, a connecting rod 7 and a connecting member. The top end of the PEEK rod 3 is fixed to the vertebral body of the adjacent segment through the CBT screw group. The bottom end of the PEEK rod 3 is connected to the top end of the connecting rod 7 through the connecting member. The bottom end of the connecting rod 7 is fixed to the vertebral body of the adjacent segment through the CBT screw 1 to make the PEEK rod 3 and the connecting rod 7 longitudinally arranged in a row.

[0073] Among them, the connecting member is a series double-headed CBT screw 9. The bottom end of the PEEK rod 3 is connected to the top end of the connecting rod 7 through the series double-headed CBT screw 9 to form the PEEK rod 3 and the connecting rod 7 longitudinally arranged in a row.

[0074] Among them, the first CBT screw group and the second CBT screw group each include two CBT screws 1 arranged in parallel. A set screw 2 is provided on the CBT screw 1, and a reset plug 4 is provided on the series double-headed screw 9.

[0075] The series double-headed cortical bone trajectory screw combined with the cortical trajectory screw type is suitable for the following surgical situations:

[0076] 1. Preventing adjacent segment degeneration

[0077] 2. Complex spinal deformity surgery

[0078] The series double-headed screw can provide a more flexible fixation method at the deformed site, adapt to different vertebral body shapes and angles, and help achieve precise deformity correction.

[0079] In some cases of adolescent idiopathic scoliosis with large angles, vertebral rotation and thoracic deformity, the series double-headed screw can be fixed and adjusted at multiple segments at multiple angles, improving the correction effect and the stability of the surgery.

[0080] 4. Surgery for spinal fractures with dislocations

[0081] The series double-headed screw can act simultaneously at the fracture and dislocation sites. By fixing and traction of the upper and lower vertebral bodies, reduction of the dislocation and stable fixation of the fracture can be achieved.

[0082] For unstable fracture dislocations, the series double-headed screw can provide stronger anti-rotation and anti-shear forces, prevent the fracture from shifting again and the dislocation from worsening, and create good conditions for the healing and rehabilitation of the spine.

[0083] 5. Revision surgery

[0084] The series double-headed screw can be used as an effective revision means. It can be used in combination with the original internal fixation system, or replace some failed screws to improve the stability of the fixation.

[0085] For patients who have undergone multiple spinal surgeries, the anatomical structure of the spine may change, and the surgical difficulty is relatively large. The series double-headed screw can be designed and applied individually according to specific situations to adapt to complex surgical requirements.

[0086] In addition to the above situations, domino, parallel, and series can realize the combination use of cortical bone trajectory screws and traditional pedicle screws to meet different requirements under different surgical types and different surgical conditions. The domino joint and the parallel double-headed screw can realize the combination use of 4 traditional screws and 2 CBT screws; the series double-headed cortical bone trajectory screw can realize the combination use of 6 CBT screws.

[0087] Example 4

[0088] Based on an in vitro human bone model as the test basis, an installation method of a spinal fusion internal fixation system for preventing adjacent segment degeneration, including the spinal fusion internal fixation system for preventing adjacent segment degeneration in Embodiment 1, specifically includes the following steps:

[0089] S1: On the adjacent segment vertebrae, implant a CBT screw group, and on the vertebrae of the fusion segment, implant a first pedicle screw group and a second pedicle screw group. The CBT screw group, the first pedicle screw group, and the second pedicle screw group are arranged in sequence from top to bottom. Among them, the CBT screw group includes two CBT screws 1 arranged in parallel, the first pedicle screw group includes a first pedicle screw 6-1 and a second pedicle screw 6-2, and the second pedicle screw group includes a third pedicle screw 6-3 and a fourth pedicle screw 6-4;

[0090] S2: Connect the top ends of two PEEK rods 3 to the CBT screws 1 respectively;

[0091] S3: Connect the top ends of two connecting rods 7 to the first pedicle screw 6-1 and the second pedicle screw 6-2 respectively;

[0092] S4: Connect the bottom ends of two PEEK rods 3 to the middle parts of two connecting rods 7 through domino joints 5;

[0093] S5: Connect the bottom ends of the connecting rods 7 to the third pedicle screw 6-3 and the fourth pedicle screw 6-4.

[0094] Embodiment 5

[0095] Based on an in vitro human bone model as the test basis, an installation method of a spinal fusion internal fixation system for preventing adjacent segment degeneration, including the spinal fusion internal fixation system for preventing adjacent segment degeneration in Embodiment 2, specifically includes the following steps:

[0096] S1: On the adjacent segment vertebrae, implant a CBT screw group, and on the vertebrae of the fusion segment, implant a pedicle screw group. Among them, the CBT screw group is arranged above the pedicle screw group. The CBT screw group includes two CBT screws 1 arranged in parallel, and the pedicle screw group includes a fifth pedicle screw 6-5 and a sixth pedicle screw 6-6 arranged in parallel;

[0097] S2: Connect the top ends of two PEEK rods 3 to two CBT screws 1 arranged in parallel respectively;

[0098] S3: Connect the bottom ends of two PEEK rods 3 to the top ends of two connecting rods 7 through parallel double-headed screws 8 respectively;

[0099] S4: Connect the bottom ends of the two connecting rods 7 to the fifth pedicle screw 6-5 and the sixth pedicle screw 6-6 respectively.

[0100] Embodiment 6

[0101] Based on the bone model of the human body in vitro, an installation method of a spinal fusion internal fixation system capable of preventing adjacent segment degeneration includes the spinal fusion internal fixation system capable of preventing adjacent segment degeneration in Embodiment 3, and specifically includes the following steps:

[0102] S1: On the vertebral bodies of the adjacent segments, place the first group of CBT screws. On the vertebral bodies of the fusion segment, place the connecting piece and the second group of CBT screws. The first group of CBT screws is located above the series double-headed CBT screw 9 and the second group of CBT screws. Among them, both the first group of CBT screws and the second group of CBT screws include two CBT screws 1 arranged in parallel. The connecting piece includes two series double-headed CBT screws 9 arranged in parallel;

[0103] S2: Connect the top ends of the two PEEK rods 3 to the first group of CBT screws respectively;

[0104] S3: Connect the bottom ends of the two PEEK rods 3 to the top ends of the two connecting rods 7 through the series double-headed CBT screws 9 respectively;

[0105] S4: Connect the bottom ends of the two connecting rods 7 to the second group of CBT screws.

[0106] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the present invention in each embodiment.

Claims

1. A spinal fusion internal fixation system capable of preventing adjacent segment degeneration, characterized in that: It comprises a PEEK rod, a CBT screw group, a connecting rod, a pedicle screw group and a connecting piece, wherein the CBT screw group is arranged above the pedicle screw group, the top end of the PEEK rod is fixed to the vertebral body of the adjacent segment through the CBT screw group, the bottom end of the PEEK rod is connected to the top end of the connecting rod through the connecting piece, and the bottom end of the connecting rod is fixed to the vertebral body of the fusion segment through the pedicle screw group, so as to realize the parallel connection of the PEEK rod and the connecting rod.

2. The spinal fusion internal fixation system capable of preventing adjacent segment degeneration according to claim 1, characterized in that: The pedicle screw group includes a first pedicle screw group and a second pedicle screw group, the CBT screw group, the first pedicle screw group and the second pedicle screw group are arranged in sequence from top to bottom, the top of the connecting rod is connected to the first pedicle screw group, wherein the CBT screw group includes two CBT screws arranged in parallel, the first pedicle screw group and the second pedicle screw group each include two pedicle screws arranged in parallel, the connecting piece is a domino joint, and the bottom end of the PEEK rod is connected to the middle part of the connecting rod through the domino joint to achieve the parallel arrangement of the PEEK rod and the connecting rod.

3. The spinal fusion internal fixation system capable of preventing adjacent segment degeneration according to claim 1, characterized in that: The CBT screw group includes two CBT screws arranged in parallel, the pedicle screw group includes two pedicle screws arranged in parallel, the connecting piece is a parallel stud screw, and the bottom end of the PEEK rod is connected to the top end of the connecting rod through the parallel stud screw to achieve the parallel arrangement of the PEEK rod and the connecting rod.

4. A method for installing a spinal fusion internal fixation system capable of preventing adjacent segment degeneration, characterized in that: The spinal fusion internal fixation system capable of preventing adjacent segment degeneration as claimed in claim 2 specifically comprises the following steps: A CBT screw group is placed on the vertebral body of the adjacent segment, and a first pedicle screw group and a second pedicle screw group are placed on the vertebral body of the fusion segment, wherein the CBT screw group, the first pedicle screw group and the second pedicle screw group are arranged in sequence from top to bottom, wherein the CBT screw group includes two CBT screws arranged in parallel, and the first pedicle screw group and the second pedicle screw group each include two pedicle screws arranged in parallel; Connecting the top ends of the two PEEK rods to the CBT screw set; Connecting the tops of the two connecting rods to the first pedicle screw assembly respectively; Connect the bottom ends of the two PEEK rods to the middle of the connecting rod through a domino joint; The bottom ends of the two connecting rods are connected to the second pedicle screw group.

5. A method for installing a spinal fusion internal fixation system capable of preventing adjacent segment degeneration, characterized in that: The spinal fusion internal fixation system capable of preventing adjacent segment degeneration as claimed in claim 3 specifically comprises the following steps: A CBT screw group is placed on the adjacent segment vertebral body, and a pedicle screw group is placed on the vertebral body of the fusion segment, wherein the CBT screw group is arranged above the pedicle screw group, the CBT screw group includes two CBT screws arranged in parallel, and the pedicle screw group includes two pedicle screws arranged in parallel; Connecting the top ends of the two PEEK rods to the CBT screw set; Connect the bottom ends of the two PEEK rods to the top ends of the two connecting rods via parallel stud screws; The bottom ends of the two connecting rods are connected to the pedicle screw assembly.

6. A spinal fusion internal fixation system capable of preventing adjacent segment degeneration, characterized in that: It comprises a PEEK rod, a CBT screw group, a connecting rod and a connecting piece, wherein the CBT screw group comprises a first CBT screw group and a second CBT screw group, the top end of the PEEK rod is fixed to the vertebral body of the adjacent segment through the first CBT screw group, the bottom end of the PEEK rod is connected to the top end of the connecting rod through the connecting piece, and the bottom end of the connecting rod is fixed to the vertebral body of the fusion segment through the second CBT screw group, so that the PEEK rod and the connecting rod are arranged in a row longitudinally, wherein the first CBT screw group and the second CBT screw group each comprise two CBT screws arranged in parallel.

7. The spinal fusion internal fixation system capable of preventing adjacent segment degeneration according to claim 6, characterized in that: The connecting piece is a series double-headed CBT screw, and the bottom end of the PEEK rod is connected to the top end of the connecting rod through the series double-headed CBT screw, so that the PEEK rod and the connecting rod are arranged in a row along the longitudinal direction.

8. A method for installing a spinal fusion internal fixation system capable of preventing adjacent segment degeneration, characterized in that: The spinal fusion internal fixation system capable of preventing adjacent segment degeneration as claimed in claim 7 specifically comprises the following steps: A first CBT screw group is placed on the vertebral body of the adjacent segment, and the connecting member and the second CBT screw group are placed on the vertebral body of the fusion segment, wherein the first CBT screw group is located above the connecting member and the second CBT screw group, wherein the first CBT screw group and the second CBT screw group each include two CBT screws arranged in parallel, and the connecting member includes two double-headed CBT screws arranged in series in parallel; Connecting the top ends of the two PEEK rods to the first CBT screw set; Connect the bottom ends of the two PEEK rods to the top ends of the two connecting rods through a series of double-headed CBT screws; The bottom ends of the two connecting rods are connected to the second CBT screw set.

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