Cervical vertebra fusion cage

Abstract

The utility model relates to a cervical vertebra fusion cage which comprises a fusion cage body and a fixing system, the fusion cage body is of a non-closed surrounding structure and comprises a main supporting body and side supporting bodies arranged on the two sides of the main supporting body, and the fusion cage further comprises an ultra-thin closing plate used for closing the open end of the fusion cage body. First screw holes are formed in the ends, away from the main supporting body, of the side supporting bodies, the fixing system comprises two extending positioning plates, and the two extending positioning plates are arranged at the ends, away from the main supporting body, of the two side supporting bodies correspondingly; and the ultrathin sealing plate is arranged at the end part of the side support body. The fusion cage and a fixing system are integrally designed, so that the operation process is optimized, and the operation time is saved; the opening in the front face of the fusion cage enlarges the space of the bone grafting window, meanwhile, in the operation, the fusion cage can be placed firstly, then bone grafting is conducted in the bone grafting window, gaps and cavities in the bone grafting window can be fully filled by the implanted bone, the contact area of the implanted bone and the end plate is increased, and the fusion degree of the implanted bone and the end plate is improved.

Description

Technical Field

[0001] This utility model belongs to the field of orthopedic medical device technology, and in particular relates to a cervical fusion device. Background Technology

[0002] Spinal fusion is an important method for treating spinal diseases. It surgically treats spinal instability and spondylolisthesis caused by degenerative changes, trauma, etc., by restoring spinal biomechanical stability through bony fusion of the upper and lower segments. Interbody fusion includes autologous bone grafting and allogeneic bone grafting. Currently, spinal surgeons primarily use a fusion cage combined with external fixation rods and screws for spinal and cervical instability and height loss.

[0003] Traditional cervical fusion cages are hollow, ring-shaped structures. The bone graft window in the center of the cage needs to be filled with autologous or artificial bone before the entire cage is implanted into the intervertebral space. Fixation is achieved using anterior cervical titanium plates and screws. The shortcomings of existing fusion cages include: the bone graft window is implanted into the intervertebral space after external bone grafting, leading to poor anastomosis between the bone graft and the superior and inferior endplates of the vertebral body, resulting in gaps; similarly, implantation requires percussion to push the cage deeper into the intervertebral space, and the bone graft may loosen and fall off during this process, affecting the fusion between the cage and the vertebral body. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide a cervical fusion device that provides a larger bone graft space, changes the operation method of fusion surgery, and ensures the cervical fusion effect.

[0005] The technical solution adopted by this utility model to solve its technical problem is as follows: a cervical fusion device is provided, including a fusion device body and a fixation system. The fusion device body is a non-closed surrounding structure, including a main support body and side supports on both sides of the main support body, and also includes an ultra-thin sealing plate for closing the open end of the fusion device body. The side supports are provided with a first screw hole at the end away from the main support body. The fixation system includes two extension positioning plates, namely a first plate and a second plate. The first plate and the second plate are respectively provided at the ends of the two side supports away from the main support body. The free end of the first plate extends unidirectionally along the height direction. The free end of the second plate extends in the opposite direction to the free end of the first plate along the height direction. The surface of the free end of the extension positioning plate is provided with a second screw hole. The ultra-thin sealing plate is provided at the end of the side supports. The two ends of the ultra-thin sealing plate are respectively provided with a third screw hole that matches the first screw hole.

[0006] Preferably, the fusion unit body is U-shaped, the ends of the two side supports away from the main support are parallel planes, and the extended positioning plate and the ultra-thin sealing plate are both rectangular plates.

[0007] Preferably, the first plate extends upward along the height direction; the second plate extends downward along the height direction.

[0008] Preferably, the outer periphery of the ultra-thin sealing plate is provided with a shielding extension plate for partially or completely shielding the screws screwed into the second screw hole.

[0009] Preferably, both the ultra-thin sealing plate and the extended positioning plate are thin titanium plates.

[0010] The beneficial effects are as follows: This utility model, through its innovative design of the fusion device, can increase the intervertebral fusion rate in cervical spine surgery. The integrated design of the fusion device and fixation system optimizes the surgical procedure and saves surgical time; the opening on the front of the fusion device expands the space of the bone graft window, and during the operation, the fusion device can be placed first and then bone grafted in the bone graft window, which is conducive to the implanted bone fully filling the gaps in the bone graft window, reducing cavities, increasing the contact area between the implanted bone and the endplate, and improving the fusion degree between the bone graft and the endplate; the fixation system of the fusion device is located on the posterior side, with fewer prevertebral notches, which can reduce irritation to the esophagus. Attached Figure Description

[0011] Figure 1 This is a three-dimensional diagram of a cervical fusion device.

[0012] Figure 2 for Figure 1 Three-dimensional view of the main body of the fusion unit.

[0013] Figure 3 for Figure 1 Front view of the ultra-thin closed plate.

[0014] Among them, 1-fusion device body; 101-main support body; 102-side support body; 103-first screw hole; 2-fixing system; 201-first plate; 202-second plate; 203-second screw hole; 3-ultra-thin sealing plate; 301-shielding extension plate; 302-third screw hole.

[0015] The same markings in each diagram represent the same component. Detailed Implementation

[0016] The present invention will be further illustrated below with reference to specific embodiments. It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of the present invention. Furthermore, it should be understood that after reading the teachings of this invention, those skilled in the art can make various alterations or modifications to the present invention, and these equivalent forms also fall within the scope defined by the appended claims.

[0017] like Figure 1As shown, this utility model provides a cervical fusion device, including a fusion device body 1 and a fixation system 2. The fusion device body 1 is a non-closed surrounding structure, including a main support 101 and side supports 102 disposed on both sides of the main support 101. It also includes an ultra-thin sealing plate 3 for closing the opening end of the fusion device body 1. The side supports 102 have a first screw hole 103 at the end away from the main support 101. The fixation system 2 includes two extended positioning plates, namely a first plate 201 and a second plate 202. The first plate 201 and the second plate 202 are respectively disposed at one end of the two side supports 102 away from the main support 101. The free end of the first plate 201 extends unidirectionally along the height direction. The free end of the second plate 202 extends in the opposite direction to the free end of the first plate 201 along the height direction. The free end surface of the extension positioning plate has a second screw hole 203. The ultra-thin sealing plate 3 is disposed at the end of the side support 102. The two ends of the ultra-thin sealing plate 3 have third screw holes 302 that match the first screw hole 103.

[0018] like Figure 2 As shown, in one specific embodiment, the fusion body 1 is U-shaped, the ends of the two side supports 102 away from the main support 101 are parallel planes, and the extended positioning plate and the ultra-thin sealing plate 3 are both rectangular plates.

[0019] In one embodiment, the first plate 201 extends upward along the height direction; the second plate 202 extends downward along the height direction, and is respectively connected to the atlas and axis vertebrae by screws. In other embodiments, the first plate 201 and the second plate 202 may form an angle with the horizontal plane to facilitate adjustment of the screw drilling direction.

[0020] like Figure 3 As shown, the outer periphery of the ultra-thin sealing plate 3 is provided with a shielding extension plate 301 for partially blocking the screws screwed into the second screw hole 203, so that the ultra-thin sealing plate 3 can effectively prevent the screws screwed into the vertebrae from coming out during long-term use while sealing and forming the bone graft window. In other embodiments, the size of the shielding extension plate 301 can be further extended to completely block the screws.

[0021] Both the ultrathin sealing plate 3 and the extended positioning plate are thin titanium plates, which are lightweight and biocompatible. At the same time, the ultrathin titanium plates provide a large bone graft window space while ensuring strength.

[0022] The first screw hole 103, the second screw hole 203 and the third screw hole 302 are threaded.

[0023] The steps for using this utility model are as follows: the fusion device body 1 is implanted into the intervertebral space; screws are screwed into the second screw hole 203 of the extension positioning plate to fix the fusion device body 1 in the intervertebral space; autologous bone or artificial bone is filled inward from the open end of the fusion device body 1 and gradually compacted to ensure the bone graft fits with the upper and lower endplates; after the bone graft amount is satisfactory, the front ultra-thin sealing plate 3 is installed to seal the bone graft window and prevent the bone graft from falling off. At the same time, the first and last screws are screwed into the third screw hole 302 and the first screw hole 103 and locked to prevent the screws in the extension positioning plate from loosening.

Claims

1. A cervical fusion cage comprising a cage body and a fixation system, characterized in that, The fusion body is a non-closed surrounding structure, comprising a main support body and side support bodies arranged on both sides of the main support body, and further comprising an ultrathin closure plate arranged at the opening end of the fusion body, and a first screw hole is arranged at the end of the side support body away from the main support body, The fixing system comprises two extension positioning plates, namely a first plate and a second plate, which are arranged at the ends of the side support bodies away from the main support body, wherein the free end of the first plate extends in the height direction in one direction; the free end of the second plate extends in the height direction in the opposite direction relative to the extension direction of the free end of the first plate, and a second screw hole is arranged on the surface of the free end of the extension positioning plate; The ultrathin closure plate is arranged at the end of the side support body, and a third screw hole matched with the first screw hole is arranged at both ends of the ultrathin closure plate.

2. The cervical interbody fusion cage of claim 1, wherein, The fusion body is in a U shape, and the ends of the side support bodies away from the main support body are parallel planes, and the extension positioning plate and the ultrathin closure plate are both rectangular plates.

3. The cervical interbody fusion cage of claim 1, wherein, The first plate extends upward in the height direction; and the second plate extends downward in the height direction.

4. The cervical interbody fusion cage of claim 1, wherein, An extension plate is arranged on the outer periphery of the ultrathin closure plate to partially or completely shield the screw screwed into the second screw hole.

5. The cervical interbody fusion cage of claim 1 wherein, The ultrathin closure plate and the extension positioning plate are both thin titanium plates.

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