Intervertebral fusion cage

Abstract

The present invention relates to an intervertebral fusion device, which comprises a head gradient section, a support section and a tail operation section; a fixing nail channel and a support nail channel are arranged inside the support section; the fixing nail channel and the support nail channel are arranged crosswise and connected at the intersection; a fixing nail is arranged inside the fixing nail channel; a supporting nail is arranged inside the supporting nail channel; when the tail end of the fixing nail is not in contact with the top end of the supporting nail, the top end of the fixing nail is retracted inside the fixing nail channel; if the top end of the supporting nail continues to move toward the tail end of the fixing nail inside the supporting nail channel, the supporting nail squeezes the fixing nail, so that the top end of the fixing nail passes through the fixing nail channel and abuts against the cervical vertebral body outside the intervertebral fusion device, which is used to fix the intervertebral fusion device and prevent the intervertebral fusion device from loosening after surgery.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and in particular to an intervertebral fusion device. Background Art

[0002] Anterior cervical discectomy and intervertebral fusion is one of the classic cervical spine surgical methods. The traditional PEEK fusion device combined with titanium plate and screw fixation is currently the classic way to reconstruct spinal stability during surgery.

[0003] One disadvantage of the PEEK fusion device combined with titanium plate and screw fixation is that the use of titanium plate and screws will interfere with the esophagus in front of the cervical vertebral body to a certain extent, and some patients will experience varying degrees of dysphagia. Summary of the invention

[0004] The present invention aims to provide an intervertebral fusion device, and the technical problems to be solved at least include how to prevent the fusion device from loosening after surgery and how to avoid interference with the esophagus.

[0005] In order to achieve the above-mentioned purpose, the present invention provides an intervertebral fusion device, comprising a head gradient section, a support section and a tail operation section; the support section is provided with a fixing nail channel extending along the height direction of the intervertebral fusion device, and a supporting nail channel extending along the length direction of the intervertebral fusion device; the fixing nail channel and the supporting nail channel are cross-arranged and connected at the intersection; the fixing nail channel is provided with a fixing nail capable of sliding along the height direction of the intervertebral fusion device; the supporting nail channel is provided with a supporting nail capable of moving along the length direction of the intervertebral fusion device; when the tail end of the fixing nail is not in contact with the top end of the supporting nail, the top end of the fixing nail is retracted inside the fixing nail channel; if the top end of the supporting nail continues to move toward the tail end of the fixing nail inside the supporting nail channel, the supporting nail squeezes the fixing nail, so that the top end of the fixing nail passes through the fixing nail channel and abuts on the cervical vertebral body outside the intervertebral fusion device, which is used to fix the intervertebral fusion device and prevent the intervertebral fusion device from loosening after surgery.

[0006] Preferably, the head gradient section, the support section and the tail operation section are formed into an integral structure by 3D printing.

[0007] Preferably, the support section comprises a first support wall and a second support wall, and the first support wall and the second support wall are arranged parallel to each other.

[0008] Preferably, a hollow cavity is formed between the first supporting wall and the second supporting wall.

[0009] Preferably, a first fixed tooth portion is provided on the upper surface of the first support wall, and the first fixed tooth portion is used to abut against the upper cervical vertebral body above the intervertebral fusion device to increase the friction between the intervertebral fusion device and the upper cervical vertebral body to avoid postoperative loosening of the intervertebral fusion device.

[0010] Preferably, a second fixed tooth portion is provided on the upper surface of the second support wall, and the second fixed tooth portion is used to abut against the upper cervical vertebral body above the intervertebral fusion device to increase the friction between the intervertebral fusion device and the upper cervical vertebral body to avoid postoperative loosening of the intervertebral fusion device.

[0011] Preferably, a third fixed tooth portion is provided on the lower surface of the first support wall, and the third fixed tooth portion is used to abut against the lower cervical vertebral body below the intervertebral fusion device to increase the friction between the intervertebral fusion device and the lower cervical vertebral body to avoid postoperative loosening of the intervertebral fusion device.

[0012] Preferably, a fourth fixed tooth portion is provided on the lower surface of the second support wall, and the fourth fixed tooth portion is used to abut against the lower cervical vertebral body below the intervertebral fusion device to increase the friction between the intervertebral fusion device and the lower cervical vertebral body to avoid postoperative loosening of the intervertebral fusion device.

[0013] Preferably, the fixing nail channel is arranged vertically or obliquely, and the angle between the fixing nail channel and the supporting nail channel is less than or equal to 90 degrees.

[0014] Preferably, a receiving groove extending along the width direction of the intervertebral fusion device is provided in the middle of the tail operating section; a nail cap is provided at the tail end of the supporting nail, and the nail cap is stuck in the receiving groove and closely attached to the inner side wall of the receiving groove.

[0015] Preferably, the head gradient section, the first supporting wall and the second supporting wall are all provided with through holes.

[0016] Preferably, the supporting nails are self-tapping nails.

[0017] Preferably, a plurality of fixing nail channels are provided.

[0018] Preferably, a portion of the plurality of fixing nail channels is arranged obliquely toward the upper side of the intervertebral fusion cage, and another portion is arranged obliquely toward the lower side of the intervertebral fusion cage.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] The intervertebral fusion device of the present invention has a built-in fixing device (i.e., fixing nail), and no internal fixation is required in front of the vertebral body, thus avoiding interference with the esophagus and reducing the occurrence of this complication to the greatest extent. At the same time, the 3D printed intervertebral fusion device has a built-in stabilizing device (i.e., the first fixing tooth portion, the second fixing tooth portion, the third fixing tooth portion, and the fourth fixing tooth portion), thus avoiding the probability of postoperative loosening of the intervertebral fusion device. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The accompanying drawings are used to provide a further understanding of the technical solution of the present invention and constitute a part of the specification. Together with the specific implementation methods of the present application, they are used to explain the technical solution of the present invention and do not constitute a limitation on the technical solution of the present invention.

[0022] Figure 1 It is a schematic diagram of the three-dimensional structure of the intervertebral fusion cage described in the present invention.

[0023] Figure 2 It is a schematic diagram of the installation of the first embodiment of the intervertebral fusion cage of the present invention.

[0024] Figure 3 It is a schematic diagram of the installation of the second embodiment of the intervertebral fusion cage of the present invention. DETAILED DESCRIPTION

[0025] The present invention is described in more detail hereinafter to facilitate understanding of the present invention.

[0026] like Figure 1 and Figure 2 As shown, the intervertebral fusion device of the present invention comprises a head gradient section 1, a support section and a tail operation section 8; a fixing nail channel 9 extending along the height direction of the intervertebral fusion device and a supporting nail channel 10 extending along the length direction of the intervertebral fusion device are arranged inside the supporting section; the fixing nail channel 9 and the supporting nail channel 10 are arranged crosswise and connected at the intersection; a fixing nail capable of sliding along the height direction of the intervertebral fusion device is arranged inside the fixing nail channel 9; a supporting nail capable of moving along the length direction of the intervertebral fusion device is arranged inside the supporting nail channel 10; when the tail end of the fixing nail is not in contact with the top end of the supporting nail, the top end of the fixing nail is retracted inside the fixing nail channel 9; if the top end of the supporting nail continues to move toward the tail end of the fixing nail inside the supporting nail channel 10, the supporting nail squeezes the fixing nail, so that the top end of the fixing nail passes through the fixing nail channel 9 and abuts on the cervical vertebral body outside the intervertebral fusion device, which is used to fix the intervertebral fusion device and prevent the intervertebral fusion device from loosening after surgery.

[0027] Preferably, the head gradient section 1, the support section and the tail operation section 8 are formed into an integral structure by 3D printing.

[0028] Preferably, the support section comprises a first support wall 2 and a second support wall 3, and the first support wall 2 and the second support wall 3 are arranged parallel to each other.

[0029] Preferably, a hollow cavity 13 is formed between the first supporting wall 2 and the second supporting wall 3. The hollow cavity 13 can reduce the overall weight of the intervertebral fusion device and save the material cost of manufacturing the intervertebral fusion device. On the other hand, autologous bone tissue or artificial bone tissue can be implanted in the hollow cavity 13 during surgery to promote bony fusion of the upper and lower cervical vertebrae and promote the formation of an integral structure between human tissue and the intervertebral fusion device.

[0030] Preferably, a first fixed tooth portion 5 is provided on the upper surface of the first support wall 2, and the first fixed tooth portion 5 is used to abut against the upper cervical vertebral body 12 above the intervertebral fusion device to increase the friction between the intervertebral fusion device and the upper cervical vertebral body to avoid postoperative loosening of the intervertebral fusion device.

[0031] Preferably, a second fixed tooth portion 4 is provided on the upper surface of the second support wall 3, and the second fixed tooth portion 4 is used to abut against the upper cervical vertebral body 12 above the intervertebral fusion device to increase the friction between the intervertebral fusion device and the upper cervical vertebral body to avoid postoperative loosening of the intervertebral fusion device.

[0032] Preferably, a third fixed tooth portion 6 is provided on the lower surface of the first support wall 2, and the third fixed tooth portion 6 is used to abut against the lower cervical vertebral body 11 below the intervertebral fusion device to increase the friction between the intervertebral fusion device and the lower cervical vertebral body to avoid postoperative loosening of the intervertebral fusion device.

[0033] Preferably, a fourth fixed tooth portion is provided on the lower surface of the second support wall 3, and the fourth fixed tooth portion is used to abut against the lower cervical vertebral body 11 below the intervertebral fusion device to increase the friction between the intervertebral fusion device and the lower cervical vertebral body to avoid postoperative loosening of the intervertebral fusion device.

[0034] Preferably, the fixing nail channel 9 is arranged vertically or obliquely, and the angle between the fixing nail channel 9 and the supporting nail channel 10 is less than or equal to 90 degrees.

[0035] Preferably, a receiving groove 7 extending along the width direction of the intervertebral fusion device is provided in the middle of the tail operating section 8; a nail cap 15 is provided at the tail end of the supporting nail, and the nail cap 15 is stuck in the receiving groove 7 and tightly attached to the inner side wall 16 of the receiving groove 7.

[0036] Preferably, the head gradient section 1, the first support wall 2 and the second support wall 3 are all provided with through holes 18. The through holes 18 can facilitate the growth of human tissue into the through holes 18 after surgery, and promote the formation of an integral structure between the human tissue and the intervertebral fusion cage.

[0037] When in use, the intervertebral fusion device described in the present invention is implanted between the lower cervical vertebral body 11 and the upper cervical vertebral body 12 through a surgical approach in front of the human neck to play a supporting role. Since the front end of the head gradient section 1 is thin and the rear end is thick, the intervertebral fusion device is easily implanted. Since the first fixed tooth portion 5, the second fixed tooth portion 4, the third fixed tooth portion 6 and the fourth fixed tooth portion can increase the friction between the intervertebral fusion device and the lower cervical vertebral body and the upper cervical vertebral body, the intervertebral fusion device can be prevented from loosening after surgery. After implantation, the support nail is inserted into the support nail channel 10 through a surgical approach in front of the human neck.

[0038] In a preferred embodiment, the support nail is a self-tapping nail. By rotating the nail cap 15 at the tail end of the support nail, the support nail is driven to move along the length direction of the intervertebral fusion device toward the direction close to the fixing nail channel 9. When the tail end of the fixing nail contacts the top end of the support nail, the top end of the support nail continues to move inside the support nail channel 10 toward the tail end of the fixing nail, and the support nail squeezes the fixing nail, so that the top end of the fixing nail passes through the fixing nail channel 9 and abuts against the cervical vertebral body outside the intervertebral fusion device, which is used to fix the intervertebral fusion device and prevent the intervertebral fusion device from loosening after surgery.

[0039] In a preferred embodiment, Figure 3 As shown, the fixing nail channels 9 are provided in plurality.

[0040] Preferably, a portion of the plurality of fixing nail channels 9 is arranged to be inclined upwardly of the intervertebral fusion cage, and another portion is arranged to be inclined downwardly of the intervertebral fusion cage.

[0041] The 3D printed intervertebral fusion device provided by the present invention has a built-in fixing device (i.e., a fixing nail), and no internal fixation is required to be implanted in front of the vertebral body, thereby avoiding interference with the esophagus and reducing the occurrence of this complication to the greatest extent. At the same time, the 3D printed intervertebral fusion device has a built-in stabilizing device (i.e., the first fixing tooth portion 5, the second fixing tooth portion 4, the third fixing tooth portion 6, and the fourth fixing tooth portion), thereby avoiding the probability of loosening of the intervertebral fusion device after surgery.

[0042] The above describes the preferred embodiments of the present invention, but it is not intended to limit the present invention. Those skilled in the art may make improvements and changes to the embodiments disclosed herein without departing from the scope and spirit of the present invention.

Claims

1. An intervertebral fusion device for cervical vertebrae, characterized in that: The intervertebral fusion device comprises a head gradient section, a support section and a tail operation section; the support section is provided with a fixing nail channel extending along the height direction of the intervertebral fusion device and a support nail channel extending along the length direction of the intervertebral fusion device; The fixing nail channel and the supporting nail channel are arranged crosswise and connected at the intersection; a fixing nail capable of sliding along the height direction of the intervertebral fusion device is arranged inside the fixing nail channel; a supporting nail capable of moving along the length direction of the intervertebral fusion device is arranged inside the supporting nail channel; when the tail end of the fixing nail is not in contact with the top end of the supporting nail, the top end of the fixing nail is retracted inside the fixing nail channel; If the top end of the support pin continues to move inside the support pin channel toward the tail end of the fixing pin, the support pin squeezes the fixing pin, so that the top end of the fixing pin passes through the fixing pin channel and abuts against the cervical vertebral body outside the intervertebral fusion cage, so as to fix the intervertebral fusion cage and prevent the intervertebral fusion cage from loosening after surgery; The fixing nail channel is arranged vertically or obliquely, and the angle between the fixing nail channel and the supporting nail channel is less than or equal to 90 degrees; A receiving groove extending along the width direction of the intervertebral fusion device is provided in the middle of the tail operation section; a nail cap is provided at the tail end of the support nail, and the nail cap is stuck in the receiving groove and closely attached to the inner side wall of the receiving groove; The support section comprises a first support wall and a second support wall, wherein the first support wall and the second support wall are arranged parallel to each other and opposite to each other; A hollow cavity is formed between the first supporting wall and the second supporting wall; The hollow cavity is used for implanting autologous bone tissue or artificial bone tissue during surgery.

2. The intervertebral fusion cage according to claim 1, characterized in that: The head gradient section, the support section and the tail operation section are formed into an integral structure through 3D printing.

3. The intervertebral fusion cage according to claim 1, characterized in that: A first fixed tooth portion is provided on the upper surface of the first supporting wall, and the first fixed tooth portion is used to abut against the upper cervical vertebral body above the intervertebral fusion device to increase the friction between the intervertebral fusion device and the upper cervical vertebral body to avoid loosening of the intervertebral fusion device after surgery.

4. The intervertebral fusion cage according to claim 1, characterized in that: A second fixed tooth portion is provided on the upper surface of the second supporting wall, and the second fixed tooth portion is used to abut against the upper cervical vertebral body above the intervertebral fusion device to increase the friction between the intervertebral fusion device and the upper cervical vertebral body to avoid loosening of the intervertebral fusion device after surgery.

5. The intervertebral fusion cage according to claim 1, characterized in that: A third fixed tooth portion is provided on the lower surface of the first supporting wall, and the third fixed tooth portion is used to abut against the lower cervical vertebral body below the intervertebral fusion device to increase the friction between the intervertebral fusion device and the lower cervical vertebral body to avoid loosening of the intervertebral fusion device after surgery.

6. The intervertebral fusion cage according to claim 1, characterized in that: A fourth fixed tooth portion is provided on the lower surface of the second supporting wall, and the fourth fixed tooth portion is used to abut against the lower cervical vertebral body below the intervertebral fusion device to increase the friction between the intervertebral fusion device and the lower cervical vertebral body to avoid loosening of the intervertebral fusion device after surgery.

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