CN110538014B

CN110538014B - Fusion device and fusion device assembly for minimally invasive surgery

Info

Publication number: CN110538014B
Application number: CN201910953184.6A
Authority: CN
Inventors: 宋兴华; 丁俐文
Original assignee: Individual
Current assignee: Individual
Priority date: 2019-10-08
Filing date: 2019-10-08
Publication date: 2024-05-14
Anticipated expiration: 2039-10-08
Also published as: CN110538014A

Abstract

The application provides a fusion device and a fusion device assembly for minimally invasive surgery, and relates to the field of medical instruments. The cage includes a cage body. The fusion device body is internally provided with a bone grafting space. The fusion cage body is provided with a first bone grafting window and a second bone grafting window which are communicated with the bone grafting space at two ends of the first preset direction respectively, the fusion cage body is provided with a first locking hole and a second locking hole, and the first locking hole and the second locking hole are both used for inserting screws. The fusion device body is provided with a first end in a second preset direction, the first locking hole penetrates through the first end and one end of the fusion device body in the first preset direction, and the second locking hole penetrates through the first end and the other end of the fusion device body in the first preset direction. The first preset direction is perpendicular to the second preset direction. When the screw is inserted into the first locking hole and the second locking hole, broken bone tissues can be kept in contact with the bone grafting all the time, the risk of deviation and separation of the fusion device after operation is reduced, and the fusion effect is ensured.

Description

Fusion device and fusion device assembly for minimally invasive surgery

Technical Field

The application relates to the field of medical instruments, in particular to a fusion cage for minimally invasive surgery and a fusion cage assembly.

Background

At present, the prior spinal surgery mainly adopts a treatment mode of implanting a fusion device and adding an external fixing nail rod when performing spine and lumbar instability and high loss operation, and the fixing nail rod generally adopts a mode of four nails and two rods, so that the operation difficulty can be increased, and the wound healing time of a patient can be prolonged.

Disclosure of Invention

The embodiment of the application provides a fusion device and a fusion device assembly for minimally invasive surgery, which are used for solving the problem that the difficulty of the surgery is increased in the conventional fusion device by adopting a four-nail two-rod fixing mode.

In a first aspect, embodiments of the present application provide a cage for minimally invasive surgery, comprising a cage body. The fusion device body is internally provided with a bone grafting space. The fusion device body is provided with a first bone grafting window and a second bone grafting window which are communicated with the bone grafting space at two ends of the first preset direction respectively, and is provided with a first locking hole and a second locking hole which are used for inserting screws; the fusion device body is provided with a first end in a second preset direction, the first locking hole penetrates through the first end and one end of the fusion device body in the first preset direction, and the second locking hole penetrates through the first end and the other end of the fusion device body in the first preset direction; the first preset direction is perpendicular to the second preset direction.

In the above-mentioned technical scheme, when putting into the fusion ware body between two adjacent vertebrae, the garrulous bone tissue in the bone grafting space is through first bone grafting window and second bone grafting window contact with two vertebrae respectively, is equipped with on the fusion ware body and inserts first locking hole and the second locking hole of establishing the screw, can keep garrulous bone tissue and bone grafting contact all the time when inserting the screw at first locking hole and second locking, reduces the postoperative fusion ware and takes place the skew, break away from risk, guarantees the fusion effect.

In addition, the fusion device for minimally invasive surgery of the embodiment of the application has the following additional technical characteristics:

In some embodiments of the first aspect of the present application, the two ends of the fusion cage body in the third preset direction are respectively provided with a third bone grafting window and a fourth bone grafting window; the first preset direction and the second preset direction are perpendicular to the third preset direction.

In the above technical scheme, the two ends of the fusion device body in the third preset direction are respectively provided with the third bone grafting window and the fourth bone grafting window, so that broken bones placed in the bone grafting space can be prevented from contacting with human tissues in the third preset direction through the third bone grafting window and the fourth bone grafting window, and the fusion effect can be better ensured.

In some embodiments of the first aspect of the application, the first end is provided with a threaded bore.

Among the above-mentioned technical scheme, be equipped with the screw hole on the fusion ware body, the screw hole can be used for connecting other member, conveniently puts into the operation wound with the fusion ware.

In some embodiments of the first aspect of the application, the cage body has a second end disposed opposite the first end in a second predetermined direction, the second end being frustoconical.

Among the above-mentioned technical scheme, the second end is the one end that gets into the operation wound when putting into the fusion ware in to the operation wound first, and first end sets up to the frustum form, can strut the wound of front end and not harm the wound wall gradually at the in-process of putting into the fusion ware, avoids causing the secondary injury to the human body.

In some embodiments of the first aspect of the present application, the first locking hole comprises a first hole section and a second hole section, the first hole section and the second hole section are communicated through the bone grafting space, the first hole section Guan Guanchuan has a first end, and the second hole section penetrates through one end of the cage body in a first preset direction; and/or the second locking hole comprises a third hole section and a fourth hole section, the third hole section is communicated with the fourth hole section through a bone grafting space, the third hole section penetrates through the first end, and the fourth hole section penetrates through the other end of the fusion device body in the first preset direction.

In the technical scheme, the bone grafting space divides the first locking hole into the first hole section and the second hole section, the first hole section penetrates through the first end, the second hole section penetrates through one end of the fusion device body in the first preset direction, and when the screw is inserted into the first locking hole, the first hole section and the second hole section can position the screw at two different positions, so that the stability and locking strength of the screw are improved; and/or the bone grafting space divides the second locking hole into a third hole section and a fourth hole section, the third hole section penetrates through the first end, the fourth hole section penetrates through the other end of the fusion device body in the first preset direction, and when the screw is inserted into the second locking hole, the third hole section and the fourth hole section can position the screw at two different positions, so that the stability and locking strength of the screw are improved.

In some embodiments of the first aspect of the present application, the arrangement direction of the first locking holes is arranged crosswise to the arrangement direction of the second locking holes.

In the technical scheme, the first locking holes and the second locking holes are arranged in a crossing way, and the screws inserted into the first locking holes and the second locking holes are also arranged in a crossing way, so that adjacent vertebrae can be locked better, and the fusion effect is ensured.

In some embodiments of the first aspect of the application, the cage body is provided with anti-slip portions at both ends in the first preset direction.

In the technical scheme, the anti-skid part can be in contact with vertebral tissues, so that friction between the fusion device and the end face of the vertebrae can be increased, and the risk that the fusion device is deviated and separated between adjacent vertebrae so as to influence fusion between broken bone tissues and vertebral tissues is reduced.

In some embodiments of the first aspect of the application, the cleat includes a plurality of cleats that are inclined in a direction toward the first end.

Among the above-mentioned technical scheme, every non-slip raised is to the direction slope that is close to first end, can avoid when the installation fusion ware that non-slip raised and vertebra tissue produce too big friction and cause the secondary injury to the human body, and after the installation of fusion ware was accomplished, the non-slip raised can prevent effectively that the fusion ware from removing and breaking away from to the opening direction of operation wound.

In a second aspect, embodiments of the present application provide a cage assembly for minimally invasive surgery, comprising a first screw, a second screw, and a cage for minimally invasive surgery provided by the embodiments of the first aspect; the first screw is inserted into the first locking hole, and the second screw is inserted into the second locking hole.

In the technical scheme, the first screw is inserted into the first locking hole, the second screw is inserted into the second locking hole, the insertion screws in the first locking hole and the second locking hole can keep broken bone tissues in constant contact with the bone grafting, the risk of deviation and separation of the fusion device after operation is reduced, and the fusion effect is ensured.

In some embodiments of the second aspect of the application, the length of the first screw within the first locking hole is greater than the length of the first screw outside the first locking hole; the length of the second screw located in the second locking hole is greater than the length of the second screw located outside the second locking hole.

In the technical scheme, the length of the first screw positioned in the first locking hole is longer than the length of the first screw positioned outside the first locking hole; the length that the second screw is located the second locking hole is greater than the length that the second screw is located outside the second locking hole, and when first screw and second screw all are connected with the vertebra after for can first screw and second screw have sufficient length to be located the fusion ware body in order to resist the shear stress of fusion ware body to it, reduce the risk that first screw and second screw are destroyed.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic view of a reinforcement structure of a conventional cage;

Fig. 2 is a schematic structural view of a fusion device for minimally invasive surgery according to an embodiment of the first aspect of the present application at a first view angle;

Fig. 3 is a schematic structural view of a fusion device for minimally invasive surgery according to an embodiment of the first aspect of the present application at a second view angle;

Fig. 4 is a schematic structural view of a fusion device for minimally invasive surgery according to an embodiment of the first aspect of the present application at a third perspective;

Fig. 5 is a schematic structural view of a fusion device for minimally invasive surgery according to an embodiment of the first aspect of the present application at a fourth perspective;

FIG. 6 is a schematic view of a first view of a cage assembly for minimally invasive surgery according to a second embodiment of the present application;

FIG. 7 is a schematic structural view of a second view of a cage assembly for minimally invasive surgery according to a second aspect of the present application;

FIG. 8 is a schematic structural view of a third view of a cage assembly for minimally invasive surgery according to an embodiment of the second aspect of the present application;

fig. 9 is a schematic structural view of a fourth view of a cage assembly for minimally invasive surgery according to an embodiment of the second aspect of the present application.

Icon: a 100-fusion device; 10-bone grafting space; 20-a first locking hole; 21-a first bore section; 22-a second bore section; 30-a second locking hole; 31-a third bore section; 32-a fourth bore section; 40-a first end; 41-a threaded hole; 50-a second end; 60-third end; 61-a first bone grafting window; 62-cleats; 70-fourth end; 71-a second bone grafting window; 80-fifth end; 81-a third bone grafting window; 90-sixth end; 91-a fourth bone grafting window; a-a first preset direction; b-a second preset direction; c-a third preset direction; 1000-a cage assembly; 200-a first screw; 300-second screw.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments of the present application. The components of the embodiments of the present application generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the application, as presented in the figures, is not intended to limit the scope of the application, as claimed, but is merely representative of selected embodiments of the application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.

It should be noted that, without conflict, the embodiments of the present application and features of the embodiments may be combined with each other.

It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.

In the description of the embodiments of the present application, it should be noted that, the indicated orientation or positional relationship is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship conventionally put in use of the product of the application as understood by those skilled in the art, which is merely for convenience of describing the present application and simplifying the description, and is not indicative or implying that the apparatus or element to be referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present application. Furthermore, the terms "first," "second," "third," and the like are used merely to distinguish between descriptions and should not be construed as indicating or implying relative importance.

In the description of the embodiments of the present application, it should also be noted that, unless explicitly specified and limited otherwise, the terms "disposed," "mounted," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; may be directly connected or indirectly connected through an intermediate medium. The specific meaning of the above terms in the present application will be understood in specific cases by those of ordinary skill in the art.

Examples

At present, when spine surgery, lumbar instability and high loss are performed, a reinforcement mode of embedding a fusion device 100 and adding four nails and two rods is mainly adopted, as shown in fig. 1, the reinforcement mode needs to adopt an open incision device or a minimally invasive distraction channel, and the implementation of the reinforcement mode can be met. Based on this, the present application proposes a fusion cage 100 for minimally invasive surgery, which is more convenient for fixation fusion of the spine or lumbar vertebrae.

As shown in fig. 2-5, an embodiment of the present application provides a fusion cage 100 for minimally invasive surgery, comprising a cage body having a bone grafting space 10 disposed therein. The two ends of the fusion cage body in the first preset direction A are respectively provided with a first bone grafting window 61 and a second bone grafting window 71 which are communicated with the bone grafting space 10, the fusion cage body is provided with a first locking hole 20 and a second locking hole 30, and the first locking hole 20 and the second locking hole 30 are used for inserting screws; the fusion device body is provided with a first end 40 in a second preset direction B, a first locking hole 20 penetrates through the first end 40 and one end of the fusion device body in a first preset direction A, and a second locking hole 30 penetrates through the first end 40 and the other end of the fusion device body in the first preset direction A; the first preset direction A is perpendicular to the second preset direction B. When the fusion cage body is placed between two adjacent vertebrae, broken bone tissues in the bone grafting space 10 are respectively contacted with the two vertebrae through the first bone grafting window 61 and the second bone grafting window 71, the first locking hole 20 and the second locking hole 30 for inserting screws are arranged on the fusion cage body, the screws can be inserted into the first locking hole 20 and the second locking hole to keep the broken bone tissues in constant contact with the vertebrae, the risk of deviation and separation of the postoperative fusion cage 100 is reduced, and the fusion effect is ensured.

Further, the two ends of the fusion cage body in the third preset direction C are respectively provided with a third bone grafting window 81 and a fourth bone grafting window 91; the first preset direction A and the second preset direction B are perpendicular to the third preset direction C. So that the crushed bone tissue placed in the bone grafting space 10 can be contacted with the human tissue in the third preset direction C through the third bone grafting window 81 and the fourth bone grafting window 91, and the fusion effect can be better ensured.

In this embodiment, the fusion cage body is a cuboid structure, the first preset direction a is a height direction of the cuboid, and the second preset direction B is a length direction of the cuboid. The two ends of the fusion device body in the second preset direction B are defined as a first end 40 and a second end 50 respectively, the two ends of the fusion device body in the first preset direction A are defined as a third end 60 and a fourth end 70 respectively, and the two ends of the fusion device body in the third preset direction C are defined as a fifth end 80 and a sixth end 90 respectively. Wherein, the first bone grafting window 61 is arranged at the third end 60, the second bone grafting window 71 is arranged at the fourth end 70, the third bone grafting window 81 is arranged at the fifth end 80, the fourth bone grafting window 91 is arranged at the sixth end 90, and the first bone grafting window 61, the second bone grafting window 71, the third bone grafting window 81 and the fourth bone grafting window 91 are all communicated with the bone grafting space 10. In actual use, the bone grafting space 10 is closely filled with crushed bone tissue, and the crushed bone tissue leaks out of the first bone grafting window 61, the second bone grafting window 71, the third bone grafting window 81 and the fourth bone grafting window 91 to contact and fuse with human tissues.

Generally, the incision of the common minimally invasive surgery is 1cm-5cm, the incision is relatively large, and the incision of the minimally invasive surgery under the simple spinal endoscope is 0.7cm-1.0cm, and although the incision is small, if the intervertebral space fusion is not fixed after the intervertebral disc is removed, complications such as unfused, displacement of the fusion device 100, loss of the height between the vertebral bodies and the like exist. Therefore, in the embodiment, the dimension of the fusion device body is limited to perform the minimally invasive operation under the simple spinal endoscope, so that the wound in the operation process is reduced, the healing time of a patient is short, and the fixation of the vertebral body can be well realized. In this embodiment, the size of the fusion cage body in the first preset direction a is 9mm-15mm, the size in the third preset direction C is 9mm-10mm, and the size in the first preset direction a is 22mm-34mm, so that the surgical incision only needs 0.7mm-1.2mm, and the surgery can be completed without increasing the number and size of wounds and reducing the number of perspectives.

In the present embodiment, the first locking hole 20 penetrates the first end 40 and the third end 60, and the second locking hole 30 penetrates the first end 40 and the fourth end 70. Also, the arrangement direction of the first locking holes 20 is arranged to cross the arrangement direction of the second locking holes 30. So that the screws inserted into the first locking holes 20 and the second locking holes 30 are also cross-arranged, and the adjacent vertebrae can be better locked, ensuring the fusion effect.

In this embodiment, the included angle between the arrangement direction line of the first locking hole 20 and the plane formed by the second preset direction B and the third preset direction C is 20 °, and the included angle between the arrangement direction line of the second locking hole 30 and the plane formed by the second preset direction B and the third preset direction C is 20 °.

Optionally, the first locking hole 20 comprises a first hole section 21 and a second hole section 22, the first hole section 21 and the second hole section 22 are communicated through the bone grafting space 10, the first hole section 21 penetrates through the first end 40, and the second hole section 22 penetrates through one end of the fusion device body in the first preset direction a; the second locking hole 30 comprises a third hole section 31 and a fourth hole section 32, the third hole section 31 and the fourth hole section 32 are communicated through the bone grafting space 10, the third hole section 31 penetrates through the first end 40, and the fourth hole section 32 penetrates through the other end of the fusion device body in the first preset direction A. When the screw is inserted into the first locking hole 20, the first hole section 21 and the second hole section 22 can position the screw at two different positions, and when the screw is inserted into the second locking hole 30, the third hole section 31 and the fourth hole section 32 can position the screw at two different positions, so that the stability and the locking strength of the screw are improved.

In this embodiment, the first hole section 21 penetrates the first end 40, the second hole section 22 penetrates the third end 60, the third hole section 31 penetrates the first end 40, the fourth hole section 32 penetrates the fourth end 70, the first hole section 21 and the third hole section 31 are counter sunk holes, each counter sunk hole comprises a first hole and a second hole, the first hole and the second hole are coaxially arranged, the diameter of the first hole is larger than that of the second hole, and the diameter of the first hole is 2.5mm-3.6mm. The first bore section 21 and the third bore section 31 are each located on one of the diagonals of the first end 40.

When the screw is inserted into the first locking hole 20 and the second locking hole 30, the part of the screw between the first hole section 21 and the second hole section 22 is located in the bone grafting space 10, the part of the screw between the third hole section 31 and the fourth hole section 32 is also located in the bone grafting space 10, and after the bone grafting space 10 is filled with the broken bone tissue, the part of the screw located in the bone grafting space 10 is embedded into the broken bone tissue to further strengthen the screw, and meanwhile, the broken bone tissue and the fusion device 100 are fused better, and as the first hole section 21 and the third hole section 31 are countersunk, the screw heads of the screw can be located in the first hole section 21 and the third hole section 31 to keep the flatness of the first end 40 without affecting the fusion of the tissues. Of course, in other embodiments, the first locking aperture 20 may be a continuous aperture segment extending through the first and third ends 40, 60 at both ends, and the second locking aperture 30 may be a continuous aperture segment extending through the first and fourth ends 40, 70 at both ends.

Further, the first end 40 is provided with a threaded bore 41. The fusion device body is provided with a threaded hole 41, and the threaded hole 41 can be used for connecting other rods, so that the fusion device 100 can be conveniently placed in a surgical wound.

In the present embodiment, the screw hole 41 is provided between the first hole section 21 and the third hole end, the circle centers of the circles where the two first holes intersect the first end 40 and the circle center of the circle where the screw hole 41 intersects the first end 40 are located on the same straight line, and the circle centers of the circles where the two first holes intersect the first end 40 are symmetrically arranged with respect to the circle center of the circle where the screw hole 41 intersects the first end 40. The diameter of the threaded hole 41 is 2.0mm-2.6mm.

Further, the cage body has a second end 50 disposed opposite to the first end 40 in a second preset direction B, and the second end 50 is in a frustum shape. In this embodiment, the second end 50 is the end that first enters the operation wound when the fusion device 100 is placed into the operation wound, and the second end 50 is configured in a frustum shape, so that the front-end wound can be gradually opened in the process of placing the fusion device 100 without damaging the wound wall, and secondary injury to the human body is avoided. In other embodiments, the second end 50 may have other shapes without distinct edges, such as a spherical shape.

Further, the two ends of the fusion cage body in the first preset direction A are provided with anti-skid parts. The anti-slip portion can contact vertebral tissue, can increase friction between the cage 100 and the vertebral end surfaces, and reduce the risk of the cage 100 shifting and disengaging between adjacent vertebrae to affect fusion between crushed bone tissue and vertebral tissue.

In this embodiment, the two ends in the first preset direction a are the third end 60 and the fourth end 70, and in the actual use process, the third end 60 and the fourth end 70 are in contact with the vertebral tissues, and the anti-slip parts are arranged at the third end 60 and the fourth end 70, so that friction between the fusion cage 100 and the end faces of the vertebrae can be increased, and the risk that the fusion cage 100 is deviated and separated between adjacent vertebrae to affect fusion between the broken bone tissues and the vertebral tissues is reduced. In other embodiments, the ends of the cage body in the third predetermined direction C, i.e., the fifth end 80 and the sixth end 90, may also be provided with anti-slip portions to increase friction between the third end 60 and the fourth end 70 and the tissue surrounding the vertebrae to better achieve fusion.

Optionally, the cleats include a plurality of cleats 62, the cleats 62 being inclined toward the proximal direction of the first end 40. The first end 40 is the end surface that will eventually enter the incision during placement of the cage 100 into the intervertebral space, and each of the cleats 62 is inclined in a direction toward the first end 40 to avoid secondary injury to the human body due to excessive friction between the cleats 62 and vertebral tissue during installation of the cage 100, and the cleats 62 effectively prevent movement and disengagement of the cage 100 in the direction of the opening of the surgical incision after the cage 100 is installed.

As shown in fig. 6 to 9, a second aspect of the present application provides a cage assembly 1000 for minimally invasive surgery, including a first screw 200, a second screw 300, and the cage 100 for minimally invasive surgery provided by the first aspect of the present application; the first screw 200 is inserted into the first locking hole 20, and the second screw 300 is inserted into the second locking hole 30. The first screw 200 is inserted into the first locking hole 20, the second screw 300 is inserted into the second locking hole 30, the insertion screws in the first locking hole 20 and the second locking hole can keep broken bone tissues and bone grafting in constant contact, the risk of offset and separation of the fusion device 100 after operation is reduced, the fusion effect is ensured, and complications such as unfused, displacement of the fusion device 100, final collapse, high loss of vertebral bodies and the like are avoided.

Optionally, the length of the first screw 200 inside the first locking hole 20 is smaller than the length of the first screw 200 outside the first locking hole 20; the length of the second screw 300 located inside the second locking hole 30 is smaller than the length of the second screw 300 located outside the second locking hole 30. According to the mechanics principle, the section of the first screw 200 and the second screw 300 in the fusion device 100 is subjected to more shearing force, which is easy to cause instability and breakage. While the length of the first screw 200 within the first locking hole 20 is greater than the length of the first screw 200 outside the first locking hole 20, the length of the second screw 300 within the second locking hole 30 is greater than the length of the second screw 300 outside the second locking hole 30, so that the first screw 200 and the second screw 300 can be located within the cage 100 with sufficient length to resist shear stresses thereto by the cage 100, reducing the risk of the first screw 200 and the second screw 300 being damaged. In this embodiment, the first screw 200 and the second screw 300 are self-tapping screws, but may be common screws.

The above is only a preferred embodiment of the present application, and is not intended to limit the present application, but various modifications and variations can be made to the present application by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A fusion device for minimally invasive surgery, comprising a fusion device body;

The bone grafting device comprises a fusion device body, wherein a bone grafting space is arranged in the fusion device body, a first bone grafting window and a second bone grafting window which are communicated with the bone grafting space are respectively arranged at two ends of the fusion device body in a first preset direction, the fusion device body is provided with a first locking hole and a second locking hole, the first locking hole is used for inserting a first screw, the second locking hole is used for inserting a second screw, and the length of the first screw in the first locking hole is larger than that of the first screw outside the first locking hole; the length of the second screw positioned in the second locking hole is larger than the length of the second screw positioned outside the second locking hole;

The fusion device body is provided with a first end in a second preset direction, the first locking hole penetrates through the first end and one end of the fusion device body in the first preset direction, and the second locking hole penetrates through the first end and the other end of the fusion device body in the first preset direction;

Wherein the first preset direction is perpendicular to the second preset direction;

the first end is provided with a threaded hole which is a through hole;

The first locking hole comprises a first hole section and a second hole section, the first hole section is communicated with the second hole section through the bone grafting space, the first hole section pipe penetrates through the first end, and the second hole Duan Guanchuan is arranged at one end of the fusion device body in the first preset direction;

the second locking hole comprises a third hole section and a fourth hole section, the third hole section is communicated with the fourth hole section through the bone grafting space, the third hole section penetrates through the first end, and the fourth hole section penetrates through the other end of the fusion device body in the first preset direction;

the arrangement direction of the first locking holes is crossed with the arrangement direction of the second locking holes;

the first and third bore sections are each located on one of the diagonals of the first end.

2. The fusion device for minimally invasive surgery according to claim 1, wherein a third bone grafting window and a fourth bone grafting window are respectively provided at both ends of the fusion device body in a third preset direction;

The first preset direction and the second preset direction are perpendicular to the third preset direction.

3. The fusion device for minimally invasive surgery according to claim 1, wherein,

The fusion device body is provided with a second end which is arranged opposite to the first end in the second preset direction, and the second end is in a frustum shape.

4. The fusion device for minimally invasive surgery according to claim 1, wherein both ends of the fusion device body in the first preset direction are provided with anti-slip portions.

5. The fusion device for minimally invasive surgery of claim 4, wherein the cleat includes a plurality of cleats that are inclined toward a direction proximate the first end.

6. A fusion device assembly for minimally invasive surgery, comprising a first screw, a second screw and a fusion device for minimally invasive surgery according to any of claims 1-5;

The first screw is inserted into the first locking hole, and the second screw is inserted into the second locking hole;

after the bone grafting space is filled with the crushed bone tissue, a portion of the first screw and the second screw located in the bone grafting space may be embedded in the crushed bone tissue.