A self-locking cervical fusion device

Abstract

The utility model relates to the technical field of medical devices, and discloses a self-locking cervical fusion device, including: an anchor bolt, a lock buckle, and a body of the fusion device; the anchor bolt is an arc-shaped structure, and an anchor bolt insertion channel is respectively provided on both sides of the body, the anchor bolt is inserted in the anchor bolt insertion channel and locked by the lock buckle, and the two anchor bolts are both facing outward and stably connected with the upper and lower adjacent vertebral bones. The fusion device body, anchor bolt and lock buckle of the utility model are all integrated structures, and ridges are provided on the anchor bolt, and spinous processes are provided on the fusion device body, which can greatly improve the connection stability between the fusion device and the upper and lower adjacent vertebrae; and the fusion device of the utility model can be applied to all spinal segments; the body of the fusion device is made of PEEK material, and due to its good wear resistance, elasticity and biocompatibility, it can be stably used for a long time, and compared with the body made of titanium alloy, it can reduce joint wear and infection, and reduce the probability of secondary surgery.

Description

Technical Field

[0001] The utility model relates to the technical field of medical devices, in particular to a self-locking cervical fusion device. Background Art

[0002] At present, cervical and lumbar disc herniation, spinal stenosis, and spondylolisthesis are common and frequently occurring diseases, all of which require the removal of lesions and / or reduction, as well as intervertebral bone grafting and fusion surgery. Intervertebral fusion devices are important therapeutic devices in intervertebral fusion surgery. They open the intervertebral space, restore the tension of the annulus fibrosus, the anterior and posterior longitudinal ligaments of the spine, muscles, and joint capsules, and provide immediate stability to the spine, creating conditions for bone grafting and reconstruction of the spinal sequence. They have the functions of maintaining the height of the intervertebral space, restoring the support of the anterior and middle columns, increasing the capacity of the intervertebral foramen, relieving the compression of the nerve roots, and preventing intervertebral space collapse and pseudoarthrosis formation.

[0003] Most vertebral fusion devices do not have a reliable locking mechanism. The holding force between the vertebral fusion device and the adjacent vertebrae is low and the stability is poor, which will reduce the success rate of postoperative vertebral fusion and the fusion effect is poor. In order to overcome the defects of traditional vertebral fusion devices, the zero-profile fusion devices in the prior art mostly use 3D printed titanium alloy fusion devices and add locking screws or inserts for fixation. However, this form of fixation with multiple locking screws is not only very cumbersome to operate and increase the difficulty of surgery, but also there are certain blind spots in the spinal segments. For example, due to the obstruction of the mandible and sternum, it is impossible to implant fixing screws in the C2-C3 and C7-T1 segments, which makes the intervertebral fusion device of this structure have certain limitations in its scope of use. In addition, this metal fusion device is not movable and will wear the joints after long-term use, resulting in joint imbalance, thereby causing pain, infection, joint sinking, fracture and thrombosis, leading to secondary surgery. Utility Model Content

[0004] The utility model provides a self-locking cervical fusion device, which solves the problem of limited use of existing cervical fusion devices.

[0005] A self-locking cervical fusion device, comprising: an anchor bolt, a lock buckle and a fusion device body;

[0006] The anchor bolt has an arc-shaped structure, and ridges are arranged on its upper side and lower side, and the size of the inner end of the anchor bolt is smaller than the size of its middle section;

[0007] An anchor insertion channel is respectively arranged on both sides of the body, and the anchors are inserted into the anchor insertion channels and locked by locking buckles. Both anchors face outwards and are stably connected to the upper and lower adjacent vertebral bones.

[0008] Furthermore, a plurality of spinous processes are distributed on the body, and the spinous processes are connected to the upper and lower vertebral bones.

[0009] Furthermore, a bone grafting cavity for filling autologous bone or allogeneic bone is provided on the main body, and the bone grafting cavity runs through the upper and lower end surfaces of the main body.

[0010] Furthermore, the convergence angle of the inward end of the anchor bolt is 15°, and converges toward the inner side of the arc of the anchor bolt.

[0011] Furthermore, the main body is made of PEEK material.

[0012] Further, the anchor bolt is made of nickel-titanium alloy.

[0013] The utility model has the following beneficial effects:

[0014] (1) The fusion device body, anchor bolt and lock buckle of the utility model are all integrated structures. At the same time, ridges are provided on the anchor bolts and spinous processes are provided on the fusion device body, which can greatly improve the connection stability between the fusion device and the upper and lower adjacent vertebrae; and the fusion device of the utility model can be applied to all spinal segments.

[0015] (2) The fusion device body of the present invention is made of PEEK material. Due to its good wear resistance, elasticity and biocompatibility, it can be used stably for a long time. Compared with the body made of titanium alloy, it can reduce joint wear and infection and reduce the chance of secondary surgery.

[0016] (3) The fusion device of the present invention has a small number of components and is easy to operate, thereby reducing the difficulty of surgery. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a front view schematic diagram of the fusion device structure of the utility model;

[0018] Figure 2 It is a right side view schematic diagram of the fusion device structure of the utility model;

[0019] Figure 3 It is a front view schematic diagram of the fusion device body in the utility model;

[0020] Figure 4 It is a top view schematic diagram of the fusion device body in the utility model;

[0021] Figure 5 It is a schematic diagram of the structure of the anchor bolt in the utility model;

[0022] Figure 6 The structure of the lock in the utility model is shown in FIG. Figure 1 ;

[0023] Figure 7 The structure of the lock in the utility model is shown in FIG. Figure 2 .

[0024] In the figure: 1-main body; 101-bone graft chamber; 102-anchor insertion channel; 103-spinous process; 2-anchor; 201-ridge process; 202-inward end; 3-locking buckle. DETAILED DESCRIPTION

[0025] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0026] refer to Figures 1 to 7 The utility model provides a self-locking cervical fusion device, comprising: an anchor bolt 2, a lock buckle 3 and a body 1 of the fusion device.

[0027] The body 1 of the fusion device is provided with a bone graft chamber 101 for filling autologous bone or allogeneic bone, and the bone graft chamber 101 passes through the upper and lower end surfaces of the body 1. The body 1 of the fusion device is provided with a plurality of spinous processes 103, which are connected to the upper and lower vertebral bones to ensure the stability of the connection.

[0028] Preferably, the main body 1 is made of PEEK material. PEEK material has strong wear resistance and good biomechanical properties and biocompatibility. It can be used for a long time and has an elastic modulus closest to that of bones, which can significantly reduce the wear and infection rate of joint bones.

[0029] The anchor bolt 2 is an arc-shaped structure, and ridges 201 are respectively arranged on its upper side and lower side, and the size of the inward end 202 of the anchor bolt 2 is smaller than the size of the middle section. The convergence angle of the inward end 202 of the anchor bolt 2 is 15°, and it converges toward the inner side of the arc of the anchor bolt 2. The 15° angle can ensure the safety and directional stability of the anchor bolt 2 when it is screwed in.

[0030] An anchor insertion channel 102 is provided on each side of the body 1 of the fusion device, and the anchor 2 is inserted into the anchor insertion channel 102. Both anchors 2 face outward and form a bilateral stable connection with the upper and lower adjacent vertebral bones. The anchor 2 is locked by a lock buckle 3. One end of the lock buckle 3 with a locking groove can slide. When the anchor 2 is screwed into place on the body 1, one end of the locking groove on the lock buckle 3 is pressed into the gap of the anchor insertion channel 102, so that the anchor 2 is completely locked; after the lock buckle 3 locks the anchor 2, the ridge 201 on the anchor 2 is stably connected with the upper and lower adjacent cone bones, which can effectively prevent the body 1 of the fusion device from being displaced relative to the upper and lower adjacent cone bones, reducing the difficulty of surgery and the risk of secondary surgery.

[0031] Preferably, the anchor bolt 2 and the lock buckle 3 are both made of nickel-titanium alloy.

[0032] Preferably, the body 1 of the fusion device in this embodiment is made by 3D printing.

[0033] The main body 1, anchor bolt 2 and locking buckle 3 of the fusion device of the utility model are all an integrated structure, which is not only convenient and reliable to use, but also applicable to all spinal segments, without any blind spots in the spinal segments, and will not be affected by the obstruction of the mandible and sternum. It can be implanted in the cervical 2-cervical 3 and cervical 7-thoracic 1 segments, and at the same time, through self-locking with the locking buckle 3 and the anchor bolt 2, it can have multiple fulcrum points with the upper and lower adjacent vertebral bones, thereby improving the holding force of the main body 1 and the upper and lower adjacent vertebral bones. In addition, the fusion device of the utility model does not need to be equipped with multiple locking screws for assistance, which greatly reduces the joint imbalance caused by wear, thereby reducing the risk of secondary surgery.

[0034] The above is only a preferred embodiment of the utility model, which does not represent all possible forms of the utility model, and the protection scope of the utility model is not limited to such special statements and embodiments. According to the technical inspirations disclosed by the utility model, various other modifications and improvements that do not deviate from the essence of the utility model are made, and these modifications and improvements are still within the protection scope of the utility model.

Claims

1. A self-locking cervical fusion device, characterized in that: include: Anchor bolts (2), lock buckles (3) and a body (1) of the fusion device; The anchor bolt (2) is of an arc-shaped structure, and is provided with ridges (201) on its upper side and lower side, respectively, and the size of the inward end (202) of the anchor bolt (2) is smaller than the size of its middle section; An anchor insertion channel (102) is respectively provided on both sides of the body (1), the anchor (2) is inserted into the anchor insertion channel (102) and locked by the lock buckle (3), and the two anchors (2) are both facing outwards and stably connected to the upper and lower adjacent vertebral bones.

2. The self-locking cervical fusion cage according to claim 1, characterized in that: A plurality of spinous processes (103) are distributed on the body (1), and the spinous processes (103) are connected to the upper and lower vertebral bones.

3. The self-locking cervical fusion cage according to claim 1, characterized in that: The main body (1) is provided with a bone grafting chamber (101) for filling autologous bone or allogeneic bone, and the bone grafting chamber (101) passes through the upper and lower end surfaces of the main body (1).

4. The self-locking cervical fusion cage according to claim 1, characterized in that: The convergence angle of the inward end (202) of the anchor bolt (2) is 15°, and converges toward the inner side of the arc of the anchor bolt (2).

5. The self-locking cervical fusion cage according to claim 1, characterized in that: The body (1) is made of PEEK material.

6. The self-locking cervical fusion cage according to claim 1, characterized in that: The anchor bolt (2) is made of nickel-titanium alloy.

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