Adjustable cervical spine anterior fixation device

Abstract

The utility model discloses a kind of cervical vertebra front road adjustable fixing devices, it includes the fixed plate of rectangle, first screw hole and second screw hole are equipped on the fixed plate, first screw hole and second screw hole are respectively located the both ends of fixed plate along length direction, strip-shaped through-hole is equipped on the fixed plate and is arranged along length direction, strip-shaped through-hole is located between first screw hole and second screw hole, first connecting plate and second connecting plate are slidably installed in strip-shaped through-hole along length direction, third screw hole is equipped on the first connecting plate and second connecting plate. Its purpose is to provide a kind of cervical vertebra front road adjustable fixing device, when it is applied to cervical vertebra front road intervertebral disc resection and fusion, can keep the natural height of cervical vertebra, avoid the surgical complications of cervical vertebra axial pain.

Description

Technical Field

[0001] This utility model relates to the field of medical devices, and in particular to an adjustable fixation device for the anterior cervical spine. Background Technology

[0002] There are two approaches to cervical discectomy: posterior and anterior. Taking anterior cervical discectomy and fusion as an example, the surgical steps are: 1. Incision; 2. Exposure of the vertebral body and anterior to the intervertebral disc; 3. Positioning; 4. Distraction and reduction of the vertebral body; 5. Removal of the intervertebral disc; 6. Bone harvesting and grafting; 7. Plate fixation; 8. Suturing the incision. However, during bone grafting, because the fusion cage itself is larger than the height of the intervertebral disc to ensure compression with adjacent vertebral bodies and promote osteogenesis, it can also cause the upper and lower vertebral bodies to be displaced. If multiple intervertebral discs are removed, this can lead to excessive displacement of multiple segments, causing the cervical spine to lose its natural height and resulting in surgical complications such as axial cervical pain. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide an adjustable fixation device for the anterior cervical spine, which can maintain the natural height of the cervical spine and avoid surgical complications such as cervical axial pain when applied to anterior cervical discectomy and fusion.

[0004] This utility model relates to an adjustable fixation device for the anterior cervical spine, comprising a rectangular fixation plate, wherein the fixation plate is provided with a first screw hole and a second screw hole, the first screw hole and the second screw hole being located at opposite ends along the length of the fixation plate, and the fixation plate is provided with a strip-shaped through hole arranged along the length of the fixation plate, the strip-shaped through hole being located between the first screw hole and the second screw hole, and a first connecting plate and a second connecting plate being slidably installed in the strip-shaped through hole along the length of the fixation plate, both the first connecting plate and the second connecting plate being provided with a third screw hole.

[0005] This utility model relates to an adjustable fixation device for the anterior cervical spine. Each of the two long sides of the strip-shaped through-hole is provided with a sliding groove, which is arranged along the length of the strip-shaped through-hole. Both the first connecting plate and the second connecting plate are strip-shaped plates. The first connecting plate has a first slider at each end along its length, and the two first sliders of the first connecting plate are slidably installed in the two sliding grooves of the strip-shaped through-hole. Similarly, the second connecting plate has a second slider at each end along its length, and the two second sliders of the second connecting plate are slidably installed in the two sliding grooves of the strip-shaped through-hole.

[0006] This utility model relates to an adjustable fixation device for the anterior cervical spine. Each of the two long sides of the strip-shaped through-hole is provided with a strip-shaped slider, which is arranged along the length of the through-hole. Both the first connecting plate and the second connecting plate are strip-shaped plates. The first connecting plate has a first groove at both ends along its length, and the two first grooves of the first connecting plate are slidably mounted on the two strip-shaped sliders of the strip-shaped through-hole. Similarly, the second connecting plate has a second groove at both ends along its length, and the two second grooves of the second connecting plate are slidably mounted on the two strip-shaped sliders of the strip-shaped through-hole.

[0007] The present invention relates to an adjustable fixation device for the anterior cervical spine, wherein there are two first screw holes, and the two first screw holes are arranged at intervals along the width direction of the fixation plate.

[0008] The present invention relates to an adjustable fixation device for the anterior cervical spine, wherein there are two second screw holes, which are arranged at intervals along the width direction of the fixation plate.

[0009] The present invention relates to an adjustable fixation device for the anterior cervical spine, wherein there are two third screw holes on the first connecting plate, and the two third screw holes on the first connecting plate are arranged at intervals along the length of the first connecting plate.

[0010] The present invention relates to an adjustable fixation device for the anterior cervical spine, wherein there are two third screw holes on the second connecting plate, and the two third screw holes on the second connecting plate are arranged at intervals along the length of the second connecting plate.

[0011] The difference between this novel adjustable anterior cervical spine fixation device and existing technologies lies in its application in anterior cervical discectomy and fusion surgery. In this procedure, after disc removal, a fixation plate is first fixed to the upper and lower vertebral bodies adjacent to the removed disc. Specifically, a first screw passes through a first screw hole, fixing one end of the fixation plate along its length to the upper vertebral body. A second screw passes through a second screw hole, fixing the other end of the fixation plate along its length to the lower vertebral body. The length of the fixation plate is aligned with the axial direction of the cervical spine. This allows the fixation plate to maintain the cervical spine at its natural height. Then, along the length of the strip-shaped through-hole (which is also the length of the fixation plate and the axial direction of the cervical spine), the fixation plate is adjusted. The first and second connecting plates are slid along their axial direction, allowing them to slide away from each other. Specifically, the first connecting plate slides towards the upper vertebral body, and the second connecting plate slides towards the lower vertebral body, until the gap between the first and second connecting plates is wide enough for the fusion device to pass through, and the space between the upper and lower vertebral bodies (i.e., the installation position of the fusion device) is located between the two connecting plates. Then, the fusion device is installed between the upper and lower vertebral bodies after passing through the gap between the two connecting plates. Finally, the first connecting plate is fixed to the upper vertebral body by passing through the third screw hole on the first connecting plate with a third screw, and the second connecting plate is fixed to the lower vertebral body by passing through the third screw hole on the second connecting plate with a fourth screw. In this way, the present invention first maintains the natural height of the cervical spine by fixing the plate, then adjusts the distance between the two connecting plates to match the size of the fusion device, and then installs the fusion device between the upper and lower vertebrae after passing through the gap between the two connecting plates. It can be seen that the present invention can keep the cervical spine at its natural height during the installation of the fusion device, that is, before, during and after the installation, thereby avoiding surgical complications of cervical axial pain.

[0012] The present invention will be further described below with reference to the accompanying drawings. Attached Figure Description

[0013] Figure 1 This is a front view of the adjustable anterior cervical fixation device of this utility model;

[0014] Figure 2 This is a perspective view of the adjustable anterior cervical fixation device of this utility model;

[0015] Figure 3 This is a perspective view of the fixing plate in this utility model;

[0016] Figure 4 This is a perspective view of the first connecting plate in this utility model (which is also a perspective view of the second connecting plate);

[0017] Figure 5This is a diagram showing the usage state of the adjustable anterior cervical fixation device of this utility model.

[0018] In the diagram: 1. Fixing plate; 2. First connecting plate; 3. Second connecting plate; 4. First screw hole; 5. Second screw hole; 6. Third screw hole; 7. Strip-shaped through hole; 8. Slide groove; 9. First slider; 10. Second slider; 11. Upper vertebral body; 12. Lower vertebral body; 13. Fusion device. Detailed Implementation

[0019] like Figure 1 As shown, and in combination Figure 2-5 As shown, the adjustable anterior cervical fixation device of this utility model includes a rectangular fixation plate 1. The fixation plate 1 is provided with a first screw hole 4 and a second screw hole 5, which are respectively located at both ends of the fixation plate 1 along the length direction. The fixation plate 1 is provided with a strip-shaped through hole 7 arranged along the length direction. The strip-shaped through hole 7 is located between the first screw hole 4 and the second screw hole 5. A first connecting plate 2 and a second connecting plate 3 are slidably installed in the strip-shaped through hole 7 along the length direction. Both the first connecting plate 2 and the second connecting plate 3 are provided with a third screw hole 6.

[0020] The length direction of the strip-shaped through hole 7 is the same as the length direction of the fixed plate 1. The first connecting plate 2 and the second connecting plate 3 can slide along the length direction of the strip-shaped through hole 7, that is, they can slide along the length direction of the fixed plate 1.

[0021] like Figure 2 , 3 As shown in Figure 4, the adjustable anterior cervical fixation device of this utility model has a sliding groove 8 on each of the two long side walls of the strip-shaped through hole 7. The sliding groove 8 is arranged along the length direction of the strip-shaped through hole 7. The first connecting plate 2 and the second connecting plate 3 are both strip plates. The first connecting plate 2 has a first slider 9 at both ends along the length direction. The two first sliders 9 of the first connecting plate 2 are slidably installed in the two sliding grooves 8 of the strip-shaped through hole 7. The second connecting plate 3 has a second slider 10 at both ends along the length direction. The two second sliders 10 of the second connecting plate 3 are slidably installed in the two sliding grooves 8 of the strip-shaped through hole 7.

[0022] Since the slide groove 8 is arranged along the length direction of the strip-shaped through hole 7, when the first connecting plate 2 and the second connecting plate 3 slide along the slide groove 8 through their respective sliders, the first connecting plate 2 and the second connecting plate 3 slide along the length direction of the strip-shaped through hole 7, that is, along the length direction of the fixed plate 1.

[0023] Of course, besides the aforementioned method of sliding the two connecting plates 2 and 3 within the strip-shaped through hole 7, the following sliding installation method can also be used: Each of the two long side walls of the strip-shaped through hole 7 is provided with a strip-shaped slider, which is arranged along the length direction of the strip-shaped through hole 7. Both the first connecting plate 2 and the second connecting plate 3 are strip-shaped plates. The first connecting plate 2 has a first groove at both ends along its length direction, and the two first grooves of the first connecting plate 2 are respectively slidably installed on the two strip-shaped sliders of the strip-shaped through hole 7. The second connecting plate 3 has a second groove at both ends along its length direction, and the two second grooves of the second connecting plate 3 are respectively slidably installed on the two strip-shaped sliders of the strip-shaped through hole 7. In this way, the first connecting plate 2 and the second connecting plate 3 can also be slidably installed within the strip-shaped through hole 7, and the two connecting plates 2 and 3 can slide along the length direction of the strip-shaped through hole 7.

[0024] like Figure 1-5 As shown, this utility model discloses an adjustable anterior cervical spine fixation device. The device includes two first screw holes 4, spaced apart along the width of the fixing plate 1. It also includes two second screw holes 5, spaced apart along the width of the fixing plate 1. Furthermore, it includes two third screw holes 6 on the first connecting plate 2, spaced apart along the length of the first connecting plate 2. Finally, it includes two third screw holes 6 on the second connecting plate 3, spaced apart along the length of the second connecting plate 3.

[0025] like Figure 5 As shown, the difference between this utility model of anterior cervical adjustable fixation device and the prior art is that this utility model of anterior cervical adjustable fixation device is applied in anterior cervical discectomy and fusion surgery. In this surgery, after the intervertebral disc is removed, the fixation plate 1 is first fixed to the upper vertebral body 11 and the lower vertebral body 12 adjacent to the removed intervertebral disc, that is, after the first screw passes through the first screw hole 4, one end of the fixation plate 1 along the length direction ( Figure 5 The upper end (as shown) is fixedly connected to the upper vertebral body 11, and the other end of the fixing plate 1 along the length direction is fixed by passing the second screw through the second screw hole 5. Figure 5The lower end of the plate (as shown) is fixedly connected to the lower vertebral body 12. The length direction of the fixing plate 1 is the same as the axis of the cervical spine, thus maintaining the cervical spine at its natural height through the fixing plate 1. Then, the first connecting plate 2 and the second connecting plate 3 are slid along the length direction of the strip-shaped through hole 7 (which is also the length direction of the fixing plate 1 and the axis of the cervical spine), allowing the first connecting plate 2 and the second connecting plate 3 to slide away from each other. That is, the first connecting plate 2 slides towards the upper vertebral body 11 (i.e., upward), and the second connecting plate 3 slides towards the lower vertebral body 12 (i.e., downward), until the first connecting plate 2... The gap between the connecting plate 2 and the second connecting plate 3 is wide enough for the fusion device 13 to pass through, and the space between the upper and lower vertebrae 11 and 12 (i.e., the installation position of the fusion device 13) is located between the two connecting plates 2 and 3. Then, the fusion device 13 is installed between the upper and lower vertebrae 11 and 12 after passing through the gap between the two connecting plates 2 and 3. Finally, the first connecting plate 2 is fixedly connected to the upper vertebrae 11 after passing through the third screw hole 6 on the first connecting plate 2 with a third screw. The second connecting plate 3 is fixedly connected to the lower vertebrae 12 after passing through the third screw hole 6 on the second connecting plate 3 with a fourth screw. In this way, the present invention first maintains the natural height of the cervical spine by fixing plate 1, and then adjusts the distance between the two connecting plates 2 and 3 to match the size of the fusion device 13. Then, the fusion device 13 is installed between the upper and lower vertebrae 11 and 12 after passing through the gap between the two connecting plates 2 and 3. It can be seen that the present invention can keep the cervical spine at its natural height when installing the fusion device 13, that is, before, during and after the installation of the fusion device 13, thereby avoiding surgical complications of cervical axial pain.

[0026] After the fusion device 13 is installed between the upper and lower vertebral bodies 11 and 12, the first connecting plate 2 and the second connecting plate 3 need to be fixedly connected to the upper vertebral body 11 and the lower vertebral body 12 respectively. At this time, the doctor can choose to slide the first connecting plate 2 and the second connecting plate 3 downward and upward respectively to block the fusion device 13, and then fix the first connecting plate 2 and the second connecting plate 3 to the upper vertebral body 11 and the lower vertebral body 12 respectively with screws. This can further prevent the fusion device 13 from slipping out between the upper and lower vertebral bodies 11 and 12. Of course, the first connecting plate 2 and the second connecting plate 3 can also be fixed directly to the upper vertebral body 11 and the lower vertebral body 12 respectively with screws without sliding the first connecting plate 2 and the second connecting plate 3. At this time, although the two connecting plates 2 and 3 do not block the fusion device 13, the fusion device 13 can still be stably installed between the upper and lower vertebral bodies 11 and 12 by its own countersunk teeth.

[0027] In this invention, the materials of the fixing plate 1, the first connecting plate 2, the second connecting plate 3, and the screws can be any clinically available material, such as stainless steel, titanium alloy, polymer, etc.

[0028] To achieve a closer fit to the cervical spine, the side of the fixation plate 1 that fits against the cervical spine ( Figure 2 The lower side of the fixing plate 1 shown is curved, which matches the shape of the anterior cervical spine. Similarly, the sides of the first connecting plate 2 and the second connecting plate 3 that fit against the cervical spine ( Figure 2 The lower sides of the first connecting plate 2 and the second connecting plate 3 shown also adopt an arc-shaped surface.

[0029] When the first connecting plate 2 and the second connecting plate 3 are slidably installed in the strip-shaped through hole 7 of the fixed plate 1, the fixed plate 1 can be designed as a split structure consisting of two halves, for example, Figure 1 As shown, the fixing plate 1 is designed as a left half and a right half along the left-right direction. First, the first slider 9 on the left side of the first connecting plate 2 is slidably installed on the strip-shaped through hole 7 in the left half. At the same time, the second slider 10 on the left side of the second connecting plate 3 is also slidably installed on the strip-shaped through hole 7 in the left half. Then, the right half is moved so that the strip-shaped through hole 7 in the right half is slidably installed with the first slider 9 on the right side of the first connecting plate 2 and the second slider 10 on the right side of the second connecting plate 3. Finally, the left half and the right half are fixedly connected by welding or other methods to obtain the adjustable anterior cervical spine fixation device of this utility model.

[0030] It should be noted that the terms "center", "upper", "lower", "front", "rear", "left", "right", "middle", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0031] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0032] The embodiments described above are merely preferred embodiments of the present utility model and are not intended to limit the scope of the present utility model. Various modifications and improvements made to the technical solutions of the present utility model by those skilled in the art without departing from the spirit of the present utility model should fall within the protection scope defined by the claims of the present utility model.

Claims

1. An adjustable anterior cervical spine fixation device, characterized in that: The device includes a rectangular fixing plate with a first screw hole and a second screw hole located at opposite ends along its length. A strip-shaped through hole is also provided along the length of the fixing plate, positioned between the first and second screw holes. A first connecting plate and a second connecting plate are slidably mounted within the strip-shaped through hole along its length. Both the first and second connecting plates have a third screw hole.

2. The adjustable anterior cervical fixation device according to claim 1, characterized in that: The two long side walls of the strip-shaped through hole are provided with sliding grooves, which are arranged along the length direction of the strip-shaped through hole. The first connecting plate and the second connecting plate are both strip-shaped plates. The first connecting plate is provided with a first slider at both ends along the length direction. The two first sliders of the first connecting plate are slidably installed in the two sliding grooves of the strip-shaped through hole, respectively. The second connecting plate is provided with a second slider at both ends along the length direction. The two second sliders of the second connecting plate are slidably installed in the two sliding grooves of the strip-shaped through hole, respectively.

3. The adjustable anterior cervical fixation device according to claim 1, characterized in that: Both long side walls of the strip-shaped through hole are provided with strip-shaped sliders, which are arranged along the length direction of the strip-shaped through hole. The first connecting plate and the second connecting plate are both strip-shaped plates. The first connecting plate has a first sliding groove at both ends along the length direction. The two first sliding grooves of the first connecting plate are respectively slidably installed on the two strip-shaped sliders of the strip-shaped through hole. The second connecting plate has a second sliding groove at both ends along the length direction. The two second sliding grooves of the second connecting plate are respectively slidably installed on the two strip-shaped sliders of the strip-shaped through hole.

4. The adjustable anterior cervical fixation device according to claim 2 or 3, characterized in that: There are two first screw holes, which are arranged at intervals along the width of the fixing plate.

5. The adjustable anterior cervical fixation device according to claim 4, characterized in that: There are two second screw holes, which are spaced apart along the width of the fixing plate.

6. The adjustable anterior cervical fixation device according to claim 5, characterized in that: There are two third screw holes on the first connecting plate, and the two third screw holes on the first connecting plate are arranged at intervals along the length of the first connecting plate.

7. The adjustable anterior cervical fixation device according to claim 6, characterized in that: The second connecting plate has two third screw holes, which are arranged at intervals along the length of the second connecting plate.

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