CN111888056A - Vertebral body X-shaped excision decompression vertebral body shaping intervertebral fusion fixator - Google Patents

Abstract

The invention discloses an intervertebral fusion fixator, which relates to the field of medical devices and solves the problem of providing a vertebroplasty with an X-shaped resection and decompression of the anterior cervical vertebral body, which can shorten the crawling replacement distance of the bone and reduce the A fusion fixator that improves the fusion time and improves the success rate of bone graft fusion. The technical scheme adopted in the present invention is: a vertebral body X-shaped resection and decompression vertebroplasty intervertebral fusion fixer, including a fusion fixation body and a screw, the fusion fixation body is provided with three bone grafting cavities, and the horizontal section of the first bone grafting cavity is Fan-shaped, the outer sides of the two radii of the fan-shaped are the second and third bone grafting cavities, respectively, and a fixed block is set above or below the arc edge of the fan-shaped, and the fixed block is provided with a through hole and is equipped with a first screw, the first screw is used for The first bone graft cavity is provided with fixing holes on the arc edge, and screws for implanting the residual vertebral bodies on both sides and the adjacent normal vertebral bodies are respectively arranged in the fixing holes. The invention is suitable for the X-shaped resection and decompression vertebroplasty of the anterior cervical vertebral body.

Description

Vertebral body X-shaped resection decompression vertebroplasty interbody fusion fixator

technical field

The invention relates to the field of medical devices, in particular to an intervertebral fusion fixator in orthopedic medicine.

Background technique

Anterior cervical corpectomy decompression and fusion (ACCF) is suitable for patients who cannot achieve good spinal cord decompression by discectomy alone. For patients with both anterior and posterior spinal cord compression, combined posterior spinal canal enlargement can be considered on the basis of ACCF. ACCF is also an ideal choice for patients with vertebral body lesions (tumors, etc.), cervical dislocation, and kyphosis.

At present, the steps of subtotal corpectomy for cervical spondylosis are as follows:

First, incision, exposure and positioning. An anterior cervical incision on the right side is used. This incision has smaller scars and better postoperative appearance. The length of the incision is generally 3 to 5 cm. The skin and subcutaneous tissue were incised, and the platysma was cut off. After hemostasis, blunt and sharp separation was performed on the deep surface of the platysma, 2 to 3 cm above and below, to expand the longitudinal exposure range. The space between the medial border of the sternocleidomastoid muscle and the cervical visceral sheath is relatively loose, which is an ideal surgical approach. Accurately determine the carotid sheath and the cervical visceral sheath, lift the combined fascia between the medial side of the sternocleidomastoid muscle and the cervical visceral sheath with long toothed forceps and cut open, and expand and cut in the upward and downward directions along the gap. A loose connective tissue that is easily separated. The scapulohyoid muscle can be seen on the lateral side of the cervical visceral sheath, which can be directly exposed from its medial side or accessed from its lateral side. During the operation, blunt release was performed along the separated space with the index finger, and then the vertebral body and the anterior part of the intervertebral disc were gently separated deep. When the superior thyroid artery is exposed, the superior laryngeal nerve is visible above it. If it is not seen, it is not necessary to probe and dissociate to avoid damage. After separation of the carotid visceral sheath and carotid sheath, the trachea and esophagus are pulled to the midline with a retractor, and the carotid sheath is slightly pulled to the right to reach the vertebral body and prediscal space. Lift the prevertebral fascia with long forceps and cut it layer by layer, then separate this layer of fascia longitudinally, and gradually expand up and down to expose the vertebral body and intervertebral space, usually one or two intervertebral discs. The separation on both sides should not exceed 2 to 3 mm from the medial border of the longus neck muscle. If the separation is too large to the side, it may damage the vertebral artery and sympathetic nerve plexus passing through the transverse foramen. For fresh cervical vertebral trauma with vertebral body fracture or anterior longitudinal ligament injury, it can be located by visual observation. For old fractures or simple intervertebral disc injuries, it is sometimes difficult to distinguish them under direct vision. The most reliable method is to remove the tip of the injection needle to retain 1.5cm in length, insert the intervertebral disc, and take a lateral X-ray of the entire cervical spine. According to the X-ray or C Boom perspective positioning.

Second, to spread the vertebral body, the cervical vertebral body spreader is widely used at present. A spreader screw is screwed into the center of the upper and lower vertebral bodies of the diseased vertebra, respectively, and a spreader is sleeved on the spreader screw to spread the upper and lower ends. Spreading the vertebral body is beneficial to restore the height of the injured vertebral body and intervertebral disc, reduce the compression on the spinal cord, and facilitate the operation during vertebral body resection.

Third, decompress the upper and lower intervertebral discs of the fractured vertebral body, cut the annulus fibrosus with a sharp knife, and take out the broken intervertebral disc tissue with the nucleus pulposus forceps. Use a three-joint rongeur to remove the anterior cortical bone and most of the cancellous bone of the fractured vertebral body, pause when approaching the posterior edge of the vertebral body, first use a curette to scrape off all the intervertebral disc and endplate, and use a nerve peeler to separate the vertebral body. The gap between the posterior edge of the body and the posterior longitudinal ligament is inserted into the thin impact rongeur to gradually remove the posterior cortical bone of the vertebral body. At this point, a rectangular decompression groove is formed, and the posterior longitudinal ligament can be seen bulging. Carefully use an impact rongeur or curette to widen the bottom edge of the decompression groove and remove the pressure-causing object completely. If there is scarring of the posterior longitudinal ligament, the posterior longitudinal ligament can be hooked with a nerve stripper or a posterior longitudinal ligament hook under direct vision, and the posterior longitudinal ligament can be gradually excised with a sharp knife to complete the decompression.

Fourth, the bone grafting adjusts the height of the vertebral body spreader, so that the height of the anterior column of the cervical spine returns to normal. A rectangular bone graft was chiseled from the iliac crest, and after trimming, it was implanted into a decompression groove, and the vertebral body spreader was loosened to make the bone graft tightly embedded to complete the bone grafting. A titanium mesh cage with a diameter of 10mm or 12mm can also be used to trim the length to match the height of the decompression area, and the cancellous bone obtained from vertebral body resection is packed in the titanium mesh cage and implanted in the decompression area to avoid cutting the ilium. Pain to the patient and possible complications.

Fifth, fixation For cervical vertebral burst fractures, especially those who use titanium mesh bone grafts, anterior cervical plate fixation should be used. Plate fixation allows immediate stabilization of the cervical spine, facilitating postoperative care and early return to work. At the same time, the use of internal fixation is conducive to the healing of the bone graft, and maintains the height of the vertebral body during the healing process, so as to avoid the collapse of the bone graft during the healing process of crawling replacement, resulting in the disappearance of the curvature of the cervical spine.

Sixth, the incision was sutured. The wound was repeatedly washed with normal saline, the anterior cervical fascia was sutured, a half-pipe drainage strip was placed, and the incision was sutured layer by layer.

Referring to Figure 1, the anterior cervical vertebral body subtotal resection was performed according to the existing surgical method. The resection area A was square, and the resection was performed with a drill or rongeur. The excised bone was used to fill the titanium mesh as a bone graft material. use. There are many deficiencies in ACCF surgery, including: (1) ACCF surgery has a longer distance spanned after vertebral body resection, and a longer distance for bone replacement. Therefore, the fusion time is longer, the fusion efficiency is lower, and the risk of revision surgery is higher. (2) The healing effect of bone grafting is poor and takes a long time. Many patients have not healed in 6 months and 12 months, and they need to wear external fixation braces for a long time, which is not conducive to the early recovery of patients and their return to normal life and work. . (3) At present, titanium meshes are mainly used as implants. The titanium meshes are not fixed and are easily displaced into the spinal canal, causing paralysis, etc. In addition, the titanium meshes are relatively sharp and have a small contact area, which is easy to puncture the vertebral endplates. cause the implant to sink. (4) If autologous ilium, rib, fibula and other supports are used, although the success rate of surgical fusion can be increased, it will increase the surgical trauma, bring additional damage to the patient, and increase the pain, hematoma, infection, etc. complication. (5) In the prior art solution, the excised vertebral body mainly adopts the following two methods: first, grinding and grinding. When grinding the vertebral body bone, the grinding drill is washed with water to dissipate heat, and the bone chips are accompanied by the flushing liquid. Second, use a rongeur to bite it off and fill the titanium mesh with broken bone. The excised vertebral bone cannot be reused as a bone graft material that supports the vertebral body for secondary use.

Therefore, how to convert the crawling replacement distance of the bone spanning the length of one vertebral body or even multiple vertebral bodies into intervertebral fusion, improve the fusion rate and shorten the fusion time, reduce the work delay time and promote early recovery, is one of the challenges faced by ACCF surgery at this stage. question.

SUMMARY OF THE INVENTION

The invention provides an intervertebral fusion fixator which is matched with anterior cervical vertebral body X-shaped resection and decompression vertebroplasty, which can shorten the crawling replacement distance of the bone, reduce the fusion time, and improve the success rate of bone graft fusion.

The technical scheme adopted by the present invention to solve the technical problem is as follows: a vertebral body X-shaped resection and decompression vertebroplasty intervertebral fusion fixator, including a fusion fixation body and a screw, the fusion fixation body is flat in the horizontal direction, and the fusion fixation body Three bone grafting cavities are set, namely the first bone grafting cavity, the second bone grafting cavity and the third bone grafting cavity. The horizontal section of the first bone grafting cavity is fan-shaped, and the outer sides of the two radii of the fan shape are the second bone grafting cavity respectively. In the bone cavity and the third bone graft cavity, a convex or concave fixing block is arranged above or below the arc edge of the sector, and the fixing block is provided with a through hole and the through hole is equipped with a matching first screw;

The arc edge of the first bone graft cavity is provided with at least three fixing holes, one of the fixing holes is provided with a second screw pointing in the direction of the second bone graft cavity and inclined to the direction of the fixing block, and another fixing hole is provided with a second screw. The third screw points to the direction of the third bone graft cavity and is inclined to the direction of the fixing block, and the remaining fixing holes are provided with fourth screws that are inclined to the opposite direction of the fixing block.

Further, the implantation direction of the second screw is an angle of 30° to 45° in the coronal plane, and the angle between the second screw and the plane where the fusion fixture is located in the sagittal plane is 40° to 50°; the third screw The implantation direction of the second screw is consistent with the implantation direction of the second screw.

Further, one or two fixing holes for assembling the fourth screw are set on the arc edge of the first bone graft cavity; when there is only one fourth screw, the implantation direction of the fourth screw is 45° oblique in the sagittal plane, The inclination angle in the coronal plane is 0°; when there are two fourth screws, the implantation direction of the fourth screw is 45° in the sagittal plane, and 0-15° in the coronal plane.

Further, the cavity walls of the three bone grafting cavities are respectively provided with a plurality of through holes communicating with the outside world.

Further, the partition between the first bone graft cavity and the second bone graft cavity is provided with a plurality of through holes, and the partition plate between the first bone graft cavity and the third bone graft cavity is provided with a plurality of through holes.

Specifically: at least 3 to 4 fixing holes are arranged on the arc edge of the first bone graft cavity.

Further, the fusion and fixation body is an axis-symmetric structure, and the axis of symmetry is the midline passing through the center of the sector of the first bone graft cavity.

Specifically: the outer contour of the fusion fixed body on the horizontal section is a crescent shape, a semicircle, an ellipse or a fan ring.

Specifically: the material of the fusion fixation body is PEEK material, titanium alloy or composite material.

Specifically: the screws are titanium alloy screws or absorbable fixing screws.

The beneficial effects of the present invention are as follows: first, through the X-shaped resection and decompression vertebroplasty interbody fusion fixator, the ACCF operation is changed to an anterior cervical discectomy and fusion of two space fusions (Anterior cervical discectomy and fusion) , ACDF) surgery, namely vertebral body X-shaped resection and decompression, vertebral body reconstruction and interbody fusion fixation, shortens the distance of bone crawling replacement, so the fusion time is shortened, the patient's fusion efficiency is increased, and the work delay time is shortened, which is beneficial for patients to quickly recovery. Second, the success rate of bone graft fusion is increased, and patients do not need to wear external fixation such as cervical collars for a long time after surgery, and can return to normal work and life earlier, which has less psychological impact on patients and is conducive to reducing the health and economy of patients. burden. Third, compared with the use of titanium mesh in traditional ACCF surgery, it avoids the risk of the titanium mesh sinking, shifting, and protruding into the spinal canal to damage the spinal cord, and reduces surgery-related complications. Fourth, the intervertebral fusion fixator does not require additional surgery to obtain autologous bone, but uses the autologous vertebral bone that needs to be resected for secondary use, making it a supporting bone graft material, avoiding the use of artificial bone during surgery. and other materials, reducing the risk of postoperative infection, rejection, etc., and reducing the cost of surgery for patients. Fifth, compared with the support scheme using autologous ilium, rib, fibula, etc., it avoids surgical trauma and additional injury caused by bone extraction to patients, and avoids complications such as pain, hematoma, and infection in the surgical bone extraction area. . Sixth, the fusion and fixation body is provided with a fixed block, which can fix the re-grafted bone block through the first screw, increase the stress of the re-grafted bone block to the rear side, and promote the osteogenic healing of the re-grafted bone block and the residual vertebral bodies on both sides . At the same time, the first screw plays a role in stabilizing and fixing the replanted bone block, ensuring the relative fixation of the replanted bone block and the adjacent vertebral bodies above and below. . Seventh, the fusion fixed body is provided with three bone grafting cavities, which respectively connect the replanted bone blocks and the residual vertebral bodies on both sides. While forming a supporting role, it can promote the cutting of the vertebral body and the adjacent vertebral bodies. Bone replacement and fusion. Eighth, it avoids complications such as dysphagia caused by stimulation of the esophagus caused by anterior cervical plate fixation in traditional ACCF surgery, as well as complications such as poor titanium plate position and screw loosening.

The fusion fixing body is provided with a through hole, which facilitates the mutual penetration of nutrients such as blood and facilitates fusion. The outer contour of the fusion fixation body on the horizontal section is crescent, semicircular, oval or fan-shaped, which can provide good support for the residual vertebral bodies on both sides, and can also provide good support for the replanted vertebral body. .

Description of drawings

FIG. 1 is a schematic diagram of the resection range of the existing subtotal cervical vertebral body resection by anterior cervical approach and cervical fusion.

Fig. 2 is a schematic diagram of the first resection range of the anterior cervical vertebral body X-shaped resection and decompression vertebroplasty proposed by the present invention.

FIG. 3 is a schematic diagram of the second resection range of the anterior cervical vertebral body X-shaped resection and decompression vertebroplasty proposed by the present invention.

4 is a schematic diagram of replanting the bone fragments obtained by the first excision in the X-shaped resection and decompression vertebroplasty of the anterior cervical vertebral body proposed by the present invention.

5 is a schematic diagram of a fusion fixation body of an embodiment of the vertebral body X-shaped resection and decompression vertebroplasty interbody fusion fixator of the present invention.

Reference numerals: resection range A; fusion fixation body 1, first bone graft cavity 11, second bone graft cavity 12, third bone graft cavity 13, fixing block 14, through hole 15; first screw hole 16, The second screw hole position 17 , the third screw hole position 18 , and the fourth screw hole position 19 ;

Detailed ways

As shown in FIGS. 2 to 4 , the surgical procedure of the anterior cervical vertebral body X-shaped resection and decompression vertebral body reconstruction and interbody fusion and fixation involved in the present invention is as follows: First, a fan-shaped resection is designed on the vertebral body in cross section, such as shown in Figure 2. The excised vertebral body is subsequently used as the replanted bone block 21 , and the radius of the fan-shaped contour of the replanted bone block 21 accounts for about 60% of the anteroposterior diameter of the entire vertebral body. Next, use a rongeur and a drill to excise the back of the vertebral body. The incision is X-shaped, that is, the incision is in the shape of a small mouth and a large bottom, as shown in Figure 3. The X-shaped incision can ensure the visual field during the operation, and can complete the resection of the osteophytes and the ossification of the posterior longitudinal ligament that compress the spinal nerve at the rear, so as to achieve the purpose of surgical decompression and reduce the damage to the vertebral body. The two sides of the X-shaped incision are respectively the residual vertebral bodies. For the convenience of distinction, according to the relative positions of the residual vertebral bodies in the human body, they are respectively recorded as the first residual vertebral body 22 on the left and the second residual vertebral body 23 on the right. Again, the replanted bone block 21 is implanted on the anterior side of the X-shape, see FIG. 4 . Finally, the cut vertebral bodies and the upper and lower adjacent vertebral bodies are respectively fixed by the intervertebral fusion fixator of the present invention. The cutting vertebral body refers to the vertebral body where the incision is performed, that is, the vertebral body corresponding to the first residual vertebral body 22 and the second residual vertebral body 23 . The present invention will be further described below in conjunction with the accompanying drawings.

The vertebral body X-shaped resection and decompression vertebroplasty intervertebral fusion fixator of the invention is used for the fusion and fixation of the cut vertebral body and the upper and lower adjacent vertebral bodies. Referring to Figure 5, the X-shaped vertebral body resection and decompression vertebroplasty interbody fusion fixator includes fusion fixation body 1 and screws. The screws are divided into the first screw, the second screw, the third screw and the The fourth screw, wherein the screw is not shown in FIG. 5 , only the hole position corresponding to the screw is shown. The fusion fixation body 1 is in the shape of a flat plate in the horizontal direction, and is used for implanting and cutting the upper and lower ends of the vertebral body, and for fixing with the normal vertebral body at the upper and lower ends. The fusion and fixation body 1 is provided with three bone grafting cavities, which are a first bone grafting cavity 11 , a second bone grafting cavity 12 and a third bone grafting cavity 13 respectively. The horizontal section of the first bone grafting cavity 11 is fan-shaped, the first bone grafting cavity 11 is used to cooperate with one end of the replanted bone block 21 , and the arc edge of the fan shape is the front side. The outer sides of the two radii of the sector of the first bone graft cavity 11 are the second bone graft cavity 12 and the third bone graft cavity 13 respectively, and the first bone graft cavity 11 and the second bone graft cavity 12 are separated by a partition , the first bone graft cavity 11 and the third bone graft cavity 13 are separated by a partition. The second bone graft cavity 12 is used to cooperate with the first residual vertebral body 22 , and the third bone graft cavity 13 is used to cooperate with the second residual vertebral body 23 .

In order to facilitate the through-flow of nutrients such as blood, the cavity walls of the three bone grafting cavities are respectively provided with a plurality of through holes 15 that communicate with the outside world. At this time, the through holes 15 are located in the horizontal direction. In addition, the partition between the first bone graft cavity 11 and the second bone graft cavity 12 is also provided with a plurality of through holes 15, and the partition plate between the first bone graft cavity 11 and the third bone graft cavity 13 is provided with a plurality of through holes hole 15.

A convex or concave fixing baffle 14 is provided above or below the fan-shaped arc edge of the fusion fixing body 1 . An upwardly convex fixing baffle 14 is arranged above the arc edge. As shown in FIG. 5 , the fusion fixing body 1 is used for fusion fixing between the cutting vertebral body and the normal vertebral body on the lower side. Correspondingly, when an upwardly concave fixing baffle 14 is provided below the arc edge, the fusion fixing body 1 is used for fusion fixing between the cutting vertebral body and the normal vertebral body on the upper side. In FIG. 5 , the through hole on the fixing baffle 14 is the first screw hole 16 , and the first screw hole 16 is used for arranging the first screw, and the first screw is used for implanting the replanted bone block 21 . The fixing baffle 14 and the fusion fixing body 1 are preferably integrally formed, and are in the shape of a sheet and a circle.

The fusion fixed body 1 needs to be implanted and fixed with the replanted bone block 21, the first residual vertebral body 22, the second residual vertebral body 23, and the adjacent normal vertebral body at the same time. A screw is used for fixing, so at least three fixing holes are respectively provided on the arc edge of the first bone graft cavity 11, and screws are arranged in the fixing holes, which are respectively used to fuse the fixing body 1 with the first residual vertebral body 22 and the second residual vertebral body. Body 23 and the adjacent normal vertebral body are implanted and fixed. There are at least three fixing holes, one of which is provided with a second screw inclined in the direction of the fixing baffle 14 and directed to the second bone graft cavity 12, and the installation position of the second screw is the second screw hole 17; The fixing hole is provided with a third screw inclined in the direction of the fixing block 14 and pointing to the third bone graft cavity 13 , and the installation position of the third screw is the third screw hole 18 ; other fixing holes are provided with the fixing block 14 . The fourth screw is inclined in the opposite direction, and the installation position of the fourth screw is the fourth screw hole position 19 .

The second screw is used for implanting the first residual vertebral body 22 , so the second screw points in the direction of the second bone graft cavity 12 and is inclined in the direction of the fixing block 14 . The implantation direction of the second screw is preferably an angle of 30-45° in the coronal plane, and the angle between the second screw and the plane where the fusion fixture 1 is located in the sagittal plane is 40-50°, so as to ensure the second screw Stability after the screw is implanted into the first residual vertebral body 22 . The third screw is used for implanting the second residual vertebral body 23 , so the third screw points in the direction of the third bone graft cavity 13 and is inclined in the direction of the fixing block 14 . The implantation direction of the third screw corresponds to the implantation direction of the second screw. The fourth screw is used to implant and cut the normal vertebral body at the upper or lower part of the vertebral body. Therefore, at least one fourth screw is required as long as the fusion and fixation body 1 can be firmly connected with the adjacent normal vertebral body. For example, as shown in FIG. 5 , the fusion and fixation body 1 is provided with two fourth screw hole positions 19 , that is, two fourth screws are provided to be implanted into the normal vertebral body. When there is only one fourth screw, the fourth screw is preferably screwed into the adjacent vertebral body at an oblique angle of 45° in the sagittal plane, and the inclination angle in the coronal plane is 0°; when there are two fourth screws, the fourth screw is implanted. The best direction of entry is 45° in the sagittal plane and 0-15° in the coronal plane.

Since the first residual vertebral body 22 and the second residual vertebral body 23 are approximately axially symmetric, the fusion and fixation body 1 has an axially symmetric structure, and the symmetry axis is the midline passing through the center of the sector of the first bone graft cavity 11 . The fusion fixation body 1 of axisymmetric structure can be commonly used to cut the upper and lower sides of the vertebral body. The outer contour of the fusion fixation body 1 on the horizontal section corresponds to the shape of the vertebral body, as long as it does not compress the spinal nerve behind it, such as a crescent shape, a semicircle, an ellipse or a fan ring, wherein the outer arc of the crescent shape is is the arc edge of the first bone graft cavity 11 , the semicircular arc is the arc edge of the first bone graft cavity 11 , and the outer arc of the fan ring is the arc edge of the first bone graft cavity 11 . The material of the fusion fixing body 1 is PEEK material, titanium alloy or composite material. Screws, that is, the first screw, the second screw, the third screw and the fourth screw are all titanium alloy screws or absorbable fixation screws. The absorbable fixation screws can be selected from polylactic acid absorbable screws, L-polylactic acid (PLLA)-hydroxyphosphate Limestone (HA) composite can absorb screws etc.

Claims (10)

1. X-shaped excision decompression vertebral body shaping intervertebral fusion fixer of centrum, its characterized in that: the bone fusion fixation device comprises a fusion fixation body (1) and screws, wherein the fusion fixation body (1) is flat in the horizontal direction, the fusion fixation body (1) is provided with three bone grafting cavities, namely a first bone grafting cavity (11), a second bone grafting cavity (12) and a third bone grafting cavity (13), the horizontal section of the first bone grafting cavity (11) is fan-shaped, the outer sides of two fan-shaped radiuses are the second bone grafting cavity (12) and the third bone grafting cavity (13), an upward-convex or downward-convex fixing separation blade (14) is arranged above or below a fan-shaped arc edge, the fixing separation blade (14) is provided with a through hole, and the through hole is internally provided with a first screw matched with the through hole;

at least three fixing holes are formed in the arc edge of the first bone grafting cavity (11), a second screw which points to the direction of the second bone grafting cavity (12) and inclines towards the direction of the fixing separation blade (14) is arranged in one fixing hole, a third screw which points to the direction of the third bone grafting cavity (13) and inclines towards the direction of the fixing separation blade (14) is arranged in the other fixing hole, and a fourth screw which inclines towards the opposite direction of the fixing separation blade (14) is arranged in the other fixing holes.

2. The vertebroplasty reduced pressure vertebroplasty intervertebral fusion cage of claim 1, wherein: the implantation direction of the second screw is an included angle of 30-45 degrees from the inside to the outside in the coronal plane, and the included angle between the second screw and the plane where the fusion fixing body (1) is located in the sagittal plane is 40-50 degrees; the implantation direction of the third screw coincides with the implantation direction of the second screw.

3. The vertebroplasty reduced pressure vertebroplasty intervertebral fusion cage of claim 2, wherein: one or two fixing holes for assembling a fourth screw are arranged on the arc edge of the first bone grafting cavity (11); when one fourth screw is used, the implantation direction of the fourth screw is 45 degrees in a sagittal plane, and the inclination angle in a coronal plane is 0 degree; when two fourth screws are used, the implantation direction of the fourth screws is 45 degrees inclined in the sagittal plane, and 0-15 degrees inclined outwards in the coronal plane.

4. The vertebroplasty reduced pressure vertebroplasty intervertebral fusion cage of claim 1, wherein: the cavity walls of the three bone grafting cavities are respectively provided with a plurality of through holes (15) communicated with the outside.

5. The vertebroplasty reduced pressure vertebroplasty intervertebral fusion cage of claim 4, wherein: a plurality of through holes (15) are formed in a partition plate between the first bone grafting cavity (11) and the second bone grafting cavity (12), and a plurality of through holes (15) are formed in a partition plate between the first bone grafting cavity (11) and the third bone grafting cavity (13).

6. The vertebroplasty reduced pressure vertebroplasty intervertebral fusion cage of claim 1, wherein: the arc edge of the first bone grafting cavity (11) is provided with at least 3-4 fixing holes.

7. The vertebroplasty reduced pressure vertebroplasty intervertebral fusion cage of any of claims 1 to 6, wherein: the fusion fixing body (1) is of an axisymmetric structure, and the symmetric axis is the central line of the circle center of the sector of the first bone grafting cavity (11).

8. The vertebroplasty reduced pressure vertebroplasty intervertebral fusion cage of claim 7, wherein: the outer contour of the fusion fixing body (1) on the horizontal section is crescent, semicircular, elliptic or fan-shaped.

9. The vertebroplasty reduced pressure vertebroplasty intervertebral fusion cage of claim 7, wherein: the fusion fixing body (1) is made of PEEK material, titanium alloy or composite material.

10. The vertebroplasty reduced pressure vertebroplasty intervertebral fusion cage of claim 7, wherein: the screw is a titanium alloy screw or an absorbable fixing screw.

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