CN212522092U

CN212522092U - Split type pressurization fusion cage and system

Info

Publication number: CN212522092U
Application number: CN202020475855.0U
Authority: CN
Inventors: 菅凤增; 陈赞; 吴浩; 段婉茹; 王凯; 关健; 王兴文; 王作伟; 刘振磊; 闫寒冰; 张晓永
Original assignee: Individual
Current assignee: Xuanwu Hospital
Priority date: 2020-04-03
Filing date: 2020-04-03
Publication date: 2021-02-12
Anticipated expiration: 2030-04-03

Abstract

The utility model discloses a split type pressurization fusion cage and a system, which belong to the technical field of medical instruments, the split type pressurization fusion cage comprises a front main body part and a rear cover part which are used for being implanted into a human body separately, wherein the front main body part is provided with a vertical hollow bone grafting window, the hollow bone grafting window is provided with an opening with the backward direction, and the rear cover part is used for covering the opening; the rear parts of the front main body part and the rear cover part are respectively provided with an instrument holding structure; the split pressurized fusion cage further comprises a connecting structure for connecting the front body part and the rear cover part together. The utility model discloses an internal bone grafting mode can effectively avoid bone grafting in-process bone to drop to owing to hold to get the pressurization pincers and have the compaction device simultaneously, can pressurize the compaction to bone grafting, make bone grafting and centrum more laminate, be favorable to the centrum to fuse, hold at last and get the pressurization pincers and need not to use upper and lower apron, can not increase and fuse ware thickness, be fit for the minimal access surgery.

Description

Split type pressurization fusion cage and system

Technical Field

The utility model relates to the technical field of medical equipment, especially indicate a split type pressurization integration ware and system.

Background

Prolapse of the intervertebral disc is a common surgical condition of the spine. The symptoms are mainly expressed by the compression of pathological intervertebral discs on spinal cords or nerves, accompanied by pain or numbness of lower limbs and even paralysis, and the decompression and fusion of vertebral bodies is one of the main methods of the current intervertebral surgery. The aim of the vertebral body decompression fusion is to restore the intervertebral height, strengthen the supporting function of the front column of the vertebral column and increase the stability of the segment, and generally adopts a fusion cage to assist the vertebral body bone grafting fusion.

The present application is directed to a lumbar fusion cage. The lumbar fusion cage is generally designed to have a larger volume, on one hand, for more bone grafting and being beneficial to the fusion of the upper vertebral body and the lower vertebral body, and on the other hand, the larger volume can bear the larger pressure of the upper half part of the human body. When the bone grafting space of the lumbar vertebra fusion cage is enlarged, the situation that the bone implanted in the middle falls out due to vibration and the like generated by knocking force in the process of implanting the fusion cage into a vertebral body because the cavity is large is inevitable.

In order to prevent the bone grafting of the fusion cage from falling out in the process of being implanted into the vertebral body, the reinforcing ribs are arranged in the cavity of the fusion cage, so that the risk of bone falling out can be reduced to a certain extent, and the overall strength of the fusion cage can be increased. However, the arrangement of the reinforcing ribs can only reduce the probability of bone falling to a certain extent, but cannot fundamentally avoid bone falling, and particularly cannot avoid the bone falling due to friction with the upper and lower vertebral bodies in the implantation process.

The distractible cage solves this problem to some extent. Before being implanted into the vertebral body, the height of the fusion cage is less than that of the vertebral body, the fusion cage can be easily placed into the vertebral body, and then the fusion cage is tightly attached to the upper surface and the lower surface of the vertebral body through distraction and pressurization. The only disadvantage of the fusion cage is that the compression can be carried out only by the distraction of the fusion cage, the compression can not be carried out on the vertebral body by the bone grafting in the fusion cage, and a gap can exist between the bone and the vertebral body, which is not beneficial to the fusion of the bone and the vertebral body.

In another mode, an instrument, namely an upper cover plate and a lower cover plate, is added in the process of implanting the fusion cage, the bone grafting window of the fusion cage is shielded by the cover plates, then the fusion cage is implanted together with the upper cover plate and the lower cover plate, and then the cover plates are taken out. The implantation mode can prevent the bone falling in the implantation process of the fusion cage to the maximum extent, and has the defects that the thickness of the fusion cage is increased by the upper cover plate and the lower cover plate, and the vertebral body is required to be propped open by external force when being implanted, so the mode is not suitable for minimally invasive surgery.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model is to provide a can avoid bone grafting to drop, do benefit to the centrum and fuse, be fit for the split type pressurization fusion ware and the system of minimal access surgery.

In order to solve the technical problem, the utility model provides a technical scheme as follows:

in one aspect, there is provided a split type pressurized fusion cage comprising an anterior body section and a posterior cover section for separate implantation into a human body, wherein:

the front main body part is provided with a vertical hollow bone grafting window, the hollow bone grafting window is provided with an opening facing backwards, and the rear cover part is used for covering the opening;

the rear parts of the front main body part and the rear cover part are respectively provided with an instrument holding structure;

the split type pressurized fusion cage further comprises a connecting structure for connecting the front main body part and the rear cover part together.

In another aspect, a fusion system is provided, which includes a fusion device and a holding and taking pressurizing forceps, the fusion device is the above-mentioned split pressurizing fusion device, the holding and taking pressurizing forceps includes a first forceps body and a second forceps body hinged at the middle part, wherein:

the front ends of the first clamp body and the second clamp body are provided with holding interfaces for holding the rear part of the front main body part;

the side surfaces of the first clamp body and the second clamp body are provided with compaction rods, the front ends of the compaction rods are provided with compaction blocks, and the sizes of the compaction blocks are consistent with the size of the hollow bone grafting window.

Furthermore, the first forceps body and the second forceps body respectively comprise a forceps head positioned at the front part, a handle positioned at the rear part and a connecting rod positioned between the forceps head and the handle;

the lateral bending part is arranged on the connecting rod, so that the compaction rod is parallel to the plane where the two handles are located and is spaced at a certain distance, the compaction rod is located between the two forceps heads and is located in the plane where the two forceps heads are located, and the plane where the two handles are located is parallel to the plane where the two forceps heads are located.

Furthermore, the instrument holding structure on the front main body part is jacks positioned at two sides of the rear part of the front main body part;

the holding interfaces on the first clamp body and the second clamp body are positioned on the clamp head, each holding interface comprises an inserting column and a positioning boss, the inserting column is positioned on the inner side surface of the clamp head and matched with the inserting hole, and the positioning boss is positioned behind the inserting column and used for abutting against the rear edge of the front main body part;

the distance between the inserting column and the positioning boss is equal to the distance between the inserting hole and the rear edge of the front main body part.

Furthermore, the forceps head is provided with a depth limiting clamping table used for abutting against the outer side of the vertebral body, and/or the rear parts of the first forceps body and the second forceps body are provided with springs used for keeping the forceps head in a normally closed state.

Furthermore, the connecting rod of the second clamp body comprises a straight rod section, a vertical clamping table is arranged on the straight rod section, the vertical clamping table is provided with a pair of elastic arms, and the compaction rod is connected between the elastic arms in a sliding mode.

Further, the length of the handle of the second clamp body is greater than that of the handle of the first clamp body;

the rear end of the connecting rod of the second clamp body is hinged with a movable handle, the handle of the second clamp body and the movable handle are both provided with a support at the side of the compaction rod, and the support is provided with a connecting rod mechanism which is used for converting the rotation of the movable handle into the front and rear linear movement driving force of the compaction rod.

Further, link mechanism includes connecting block, first connecting rod and second connecting rod, wherein:

the front end of the connecting block is provided with a blind hole, and the rear end of the compaction rod is inserted into the blind hole;

the rear end of the connecting block is provided with a V-shaped connecting rod in the horizontal direction, two ends of the first connecting rod are respectively hinged between the support on the handle of the second clamp body and one V-shaped tail end of the V-shaped connecting rod, and two ends of the second connecting rod are respectively hinged between the support on the movable handle and the other V-shaped tail end of the V-shaped connecting rod.

Furthermore, the rear end of the compaction rod is of a reducing structure and comprises a large-diameter section close to the front and a small-diameter section behind the large-diameter section, steel ball jackscrews are arranged on two sides of the blind hole and abut against the small-diameter section of the reducing structure in an initial state.

Furthermore, the front end of the compaction rod is a threaded section, and the compaction block is in threaded connection with the threaded section;

the instrument holding structure on the rear cover part is a threaded hole matched with the threaded section.

Furthermore, an opening on the hollow bone grafting window of the front main body part is trapezoidal, a boss part used for covering the opening is arranged at the front end of the rear cover part, and the boss part is also trapezoidal.

Furthermore, the connection structure on the fusion cage comprises threaded holes arranged on two sides of the front main body part, step through holes arranged on two sides of the rear cover part and corresponding to the threaded holes, and screws arranged in the step through holes and the threaded holes in a penetrating mode.

The utility model discloses following beneficial effect has:

the utility model discloses a split type pressurization fuses ware and system adopts internal bone grafting mode, can effectively avoid bone grafting in-process bone to drop to owing to hold to get the pressurization pincers and have the compaction device simultaneously, can pressurize the compaction to bone grafting, make bone grafting and centrum more laminate, be favorable to the centrum to fuse, hold at last and get the pressurization pincers and need not to use upper and lower apron, can not increase and fuse ware thickness, be fit for the minimal access surgery.

Drawings

Fig. 1 is a schematic structural view of the use state of the split type pressurized fusion device of the present invention;

fig. 2 is a schematic top view of the fusion system of the present invention, in which a cross-sectional structure of a holding interface and a connecting block on a binding clip is additionally shown;

FIG. 3 is a schematic perspective view of the fusion system of FIG. 2;

fig. 4 is a schematic view of the use state of the fusion system shown in fig. 2.

Detailed Description

In order to make the technical problems, technical solutions and advantages to be solved by the present invention clearer, the following detailed description will be given with reference to the accompanying drawings and specific embodiments.

In one aspect, the present invention provides a split pressurized fusion cage 1, as shown in fig. 1-2, comprising a front body portion 11 and a rear cover portion 12 for separate implantation into a human body, wherein:

the front body 11 is provided with a vertical hollow bone grafting window 111 (the hollow bone grafting window is filled with bone grafting 3 in the embodiment shown in fig. 1), the hollow bone grafting window 111 is provided with an opening 112 facing backwards, and the rear cover part 12 is used for covering the opening 112;

the rear parts of the front main body part 11 and the rear cover part 12 are respectively provided with an instrument holding structure (the specific structure is described in detail later) so as to be implanted into a human body after the instrument is held;

the two-piece pressurized fusion cage 1 further includes a connecting structure (the specific structure is described in detail later) for connecting the front body portion 11 and the rear cover portion 12 together, and the connecting structure can enhance the firmness of the fusion cage as a whole.

On the other hand, the utility model provides a fusion system, as shown in fig. 1-4, including the fusion ware with hold and get pressurization pincers 2, the fusion ware is foretell split type pressurization fusion ware 1, holds to get pressurization pincers 2 and includes the articulated first pincers body 21 and the second pincers body 21' of connecting (articulated department is H1) in middle part, wherein:

the front ends of the first clamp body 21 and the second clamp body 21' are provided with holding interfaces for holding the rear part of the front main body part;

the lateral surfaces of the first forceps body 21 and the second forceps body 21' are provided with compaction rods 22, the front ends of the compaction rods 22 are provided with compaction blocks 23, and the sizes (width and height) of the compaction blocks 23 are consistent with the size of the hollow bone grafting window 111.

The utility model discloses well fuse ware divide into around two relatively independent parts (main part and back cap portion before promptly), and two parts all can cooperate with the apparatus. In the operation, the front part (front main body part) of the fusion device is implanted to a proper position of the vertebral body 4 through an instrument (a holding interface at the front ends of the first forceps body and the second forceps body); then, bone grafting is carried out in a cavity (a hollow bone grafting window) at the front part of the fusion device, and an instrument (a compaction rod with a compaction block) is used for compacting the bone grafting 3 at any time in the bone grafting process so as to ensure that the bone is attached to the upper surface and the lower surface of the vertebral body; finally, the rear part (posterior lid part) of the fusion device is implanted and the front body part 11 and the posterior lid part 12 are fixedly connected together by a connecting structure.

The utility model has the advantages that:

(1) the mode of bone grafting in vivo during operation is adopted, which is different from the mode of bone grafting in advance in the fusion cage before operation in the prior art, and the bone falling during the bone grafting process, particularly the falling caused by the friction between the bone and the upper and lower vertebral bodies, can be effectively prevented;

(2) the holding and taking pressurizing forceps are provided with the compacting device, so that the bone grafting in the hollow bone grafting window can be simultaneously pressurized and compacted under the condition that the front part of the fusion device is implanted into a body and the holding and taking are not loosened, the bone grafting is more fit with the vertebral body, and the fusion of the vertebral body is facilitated.

To summer up, the utility model discloses a split type pressurization fuses ware and system adopts the internal bone grafting mode, can effectively avoid planting the bone in-process bone and drop to owing to hold to get to add the pressure pincers and have the compaction device simultaneously, can add the pressure compaction to the bone of planting, make the bone of planting more laminate with the centrum, be favorable to the centrum to fuse, hold at last to get to add the pressure pincers and need not to use upper and lower apron, can not increase and fuse ware thickness, be fit for the minimal access surgery.

In order to facilitate the compression of the bone graft while holding the front part (front body part) of the fusion cage, the holding and compressing forceps 2 preferably have the following structure:

each of the first and second forceps bodies 21 and 21' includes a front forceps head 211, a rear handle 213, and a connecting rod 212 between the forceps heads 211 and the handles 213;

the connecting rod 212 is provided with a lateral bending portion 2121, so that the compacting rod 22 is parallel to a plane where the two handles 213 are located and spaced apart by a certain distance, and meanwhile, the compacting rod 22 is located between the two bits 211 and the compacting rod 22 is located in a plane where the two handles 211 are located, wherein the plane where the two handles 213 are located is parallel to the plane where the two bits 211 are located.

Like this, the binding clip of first and second pincers bodies is located the anterior both sides of fusion ware in order to hold and get the fusion ware front portion, and the certain distance is staggered through side direction flexion and the anterior place plane of fusion ware in the rest position of first and second pincers bodies to for operating the compaction pole leave enough space, make the compaction pole just to the anterior cavity bone grafting window of fusion ware, conveniently pressurize the bone grafting. This structural design who holds to get the pressurization pincers can be conveniently hold and directly pressurize the bone grafting when getting the fusion cage front portion, convenient operation, excellent in use effect.

To facilitate grasping the front portion (front body portion) of the fusion cage, the grasping-related structure can be in various ways as will be readily apparent to those skilled in the art, and is exemplified as follows:

the instrument holding structure of the front body 11 may be insertion holes 113 located at two sides of the rear portion of the front body 11, and the insertion holes 113 may be in various shapes, such as circular, square, etc., and may be set smaller in size to be the same as the insertion posts on the forceps head to be engaged with the insertion holes, however, the insertion holes 113 may also be set larger in size, such as the elongated through holes shown in the embodiments of fig. 1 and 3, so as to facilitate the bone grafting fusion in the horizontal direction;

the holding interfaces on the first forceps body 21 and the second forceps body 21' are positioned on the forceps head 211, the holding interfaces may include an inserting column 2111 and a positioning boss 2112 which are positioned on the inner side surface of the forceps head 211, the inserting column 2111 is matched with the inserting hole 113, and the positioning boss 2112 is positioned behind the inserting column 2111 and is used for abutting against the rear edge of the front main body part 11;

the distance between the post 2111 and the positioning boss 2112 is preferably equal to the distance between the insertion hole 113 and the rear edge of the front body 11, so that the binding clip of the first and second binding clip can accurately clamp the rear side of the front body, the clamping is firmer, and the binding clip is not easy to loosen.

In order to prevent the fusion cage from being implanted too deeply, the forceps head 211 can be provided with a depth-limiting clamping platform 2113, when the forceps head is used in an operation, the depth-limiting clamping platform 2113 can be propped against the outer side of a vertebral body, and the fusion cage is prevented from being displaced when the fusion cage is implanted too deeply into the vertebral body and bone grafting is pressurized. The rear parts of the first forceps body 21 and the second forceps body 21' can be provided with springs 26 to keep the forceps head 211 in a normally closed state, so that after the forceps heads of the first forceps body and the second forceps body clamp the front part (front main body part) of the fusion device, two hands do not need to continuously exert force, only the forceps bodies need to be held by hands, and the workload is reduced.

In order to integrally arrange the compacting rod 22 on the holding and pressing pliers 2, preferably, the connecting rod in the middle of the second pliers body 21' may include a straight rod section 2122, and the straight rod section 2122 is provided with a vertical clamping table 214, and the vertical clamping table 214 has a pair of elastic arms between which the compacting rod 22 is slidably connected. When the bone grafting device is used, the compaction rod with the compaction block is erected between the elastic arms on the vertical clamping table, and the rear part of the compaction rod is pushed forwards manually to pressurize the bone grafting in the hollow bone grafting window of the fusion device.

In order to avoid the operation deviation caused by pushing the compaction rod by pure hands, the following forms can be further adopted:

the length of the handle of the second forceps body 21 'is greater than that of the handle of the first forceps body 21, so that the handle of the first forceps body 21 is a front-end handle, the handle of the second forceps body 21' is a rear-end handle, and the positions are staggered, so that misoperation is avoided;

the rear end of the connecting rod of the second forceps body 21 'is hinged (the hinged position is H2) with a movable handle 24, the handle of the second forceps body 21' and the movable handle 24 are both provided with a bracket 215 at the side of the compacting rod 22, and the bracket 215 is provided with a link mechanism 25 for converting the rotation of the movable handle 24 into the driving force for the linear movement of the compacting rod 22 in the front-back direction.

Therefore, the handle and the movable handle of the second clamp body are held by hands, the movable handle rotates to drive the connecting rod mechanism to move, the compaction rod can be pushed to move forwards in a straight line, and operation deviation possibly existing when the compaction rod is directly pushed to move by the hands is well avoided.

Further, the link mechanism 25 may specifically include a connection block 251, a first link 252, and a second link 253, wherein:

the front end of the connecting block 251 is provided with a blind hole 2511, and the rear end of the compaction rod 22 is inserted in the blind hole 2511;

the rear end of the connecting block 251 is provided with a horizontal V-shaped connecting rod 254, two ends of the first connecting rod 252 are respectively hinged between the bracket 215 on the handle of the second forceps body 21' and one V-shaped tail end of the V-shaped connecting rod 254, and two ends of the second connecting rod 253 are respectively hinged between the bracket 215 on the movable handle 24 and the other V-shaped tail end of the V-shaped connecting rod 254.

In order to prevent the fusion cage from being damaged by excessive pressure during the bone grafting by compaction, an overload prevention structure can be arranged between the tail end of the compaction rod 22 and the connecting rod mechanism 25, and the overload prevention structure can be specifically as follows:

the rear end of the compaction rod 22 is of a reducing structure and comprises a large-diameter section 221 which is close to the front and a small-diameter section 222 which is located behind the large-diameter section 221, steel ball jackscrews 2512 are arranged on two sides of the blind hole 2511 of the connecting block 251, and the steel ball jackscrews 2512 abut against the small-diameter section 222 of the reducing structure in an initial state.

When the steel ball jackscrew is pushed initially, the steel ball jackscrew slides to the step between the large-diameter section and the small-diameter section of the compaction rod to generate thrust to the compaction rod, the compaction rod is pushed to move forwards through the thrust, when the thrust transmitted from the movable handle exceeds a certain limit, the steel ball jackscrew shrinks and moves to the large-diameter section of the compaction rod, the thrust to the compaction rod is unloaded, and the anti-overload effect is achieved. In the embodiment shown in fig. 2, in order to conveniently adjust the overload threshold of the driving force, an adjusting screw 2513 for adjusting the shrinkage of the spring therein may be further disposed at the tail of the steel ball top screw 2512.

As shown in fig. 3, the front end of the compaction rod 22 can be a threaded section, and the compaction block 23 can be screwed on the threaded section, so that the position of the compaction block 23 on the compaction rod 22 can be adjusted backwards correspondingly with the increase of the bone grafts 3 in the hollow bone grafting window 111 of the fusion device, and the needs of bone grafting compaction at different positions can be met without changing the length of the compaction rod 22 or replacing the compaction rod 22 with different lengths.

After the bone grafting is completed, in order to conveniently implant the rear cover part 12, the instrument holding structure on the rear cover part 12 is preferably a threaded hole 121 matched with a threaded section at the front end of the compaction rod 22, so that the rear cover part 12 can be implanted through the compaction rod 22 without introducing additional instruments, the operation is convenient, and the cost is reduced.

As shown in fig. 1-2, the opening 112 of the hollow bone grafting window 111 of the front body 11 may be trapezoidal, the front end of the rear cover portion 12 has a boss portion 122 for covering the opening 112, and the boss portion 122 is also trapezoidal, so that when the rear cover portion 12 is connected to the front body 11, the boss portion 122 can secondarily pressurize the bone grafting 3 in the hollow bone grafting window 111, which is more beneficial to vertebral fusion.

The connection structure of the fusion device for connecting the front body 11 and the rear cover 12 can be in various manners as easily conceived by those skilled in the art, for example, a clamping structure is provided at the side surfaces of the front body and the rear cover, however, in order to ensure the connection firmness, a screw connection manner can be adopted, and specifically, as shown in fig. 1, the connection structure can include threaded holes 114 provided at both sides of the front body 11, stepped through holes 123 provided at both sides of the rear cover 12 and corresponding to the threaded holes 114, and screws 13 for passing through the stepped through holes 123 and the threaded holes 114.

The intraoperative use of the fusion system of the embodiment shown in the figures can be referred to as follows:

the front end of the holding and taking pressure clamp 2 is provided with a holding and taking port, the front part (the front main body part 11) of the fusion device is provided with an insertion hole 113 matched with the holding and taking pressure clamp, a first clamp body handle of the holding and taking pressure clamp is pressed, the front end of the holding and taking pressure clamp is opened, the first clamp body handle is released after the insertion hole at the front part of the fusion device is clamped, and the height of the spring 26 is restored, so that the holding and taking pressure clamp can clamp the front part of the fusion device and keep stable. The front part of the fusion device is taken by a holding and pressurizing clamp and is implanted to the proper position of the vertebral body 4, and the depth-limiting clamping table 2113 on the holding and pressurizing clamp is propped against the outer side of the vertebral body 4 to prevent the fusion device from being implanted too much.

The pressurizing forceps are held and kept still, the middle of the front part of the fusion device is used for bone grafting, after a certain amount of bone is grafted each time, the compacting rod 22 (with a compacting block) is installed and the handle at the tail end (the movable handle 24) is held tightly, so that the compacting rod 22 moves forwards to pressurize the grafted bone, and the grafted bone is ensured to be tightly attached to the upper vertebral body and the lower vertebral body.

The vertical clamping table 214 on the holding and taking pressure clamp is matched with the connecting rod mechanism 25, so that the compaction rod 22 can only move in the front-back direction. The compaction rod 22 is in threaded connection with the front compaction block 23 and is in quick connection with the steel ball jackscrew 2512 serving as the main body of the holding and pressing clamp. The tail end of the compaction rod 22 is provided with a step, the steel ball jackscrew is adjusted to be screwed into the threaded hole on the connecting block 251 to change the pressure of the step of the compaction rod 22 automatically bouncing through the steel ball jackscrew 2512, and the front part of the fusion cage can be prevented from being damaged due to overlarge pressure. The depth-limiting blocking table 2113 on the holding and pressing clamp always props against the vertebral body 4, so that the fusion cage is ensured not to displace in the bone grafting process.

After the bone grafting is finished, the compaction block 23 is taken down from the compaction rod 22 and replaced by a fusion device rear part (rear cover part 12), and the fusion device rear part is provided with a threaded hole which is the same as the compaction block 23 and is conveniently connected with the compaction rod 22. The tamp bar holding the rear of the cage is again installed, aligning the rear of the cage with the opening in the front of the cage and grasping the trailing handle (movable handle 24) to advance the rear of the cage into engagement with the front of the cage. The opening position of the front part of the fusion device is trapezoidal, and the boss part of the rear part of the fusion device is also trapezoidal to be matched with the fusion device, so that the two parts can be conveniently combined. Threaded holes 114 are formed in the two sides of the front part of the fusion cage, step through holes 123 are formed in the two sides of the rear part of the fusion cage, the two parts are fixed tightly through screws 13, and secondary pressurization is carried out on bone grafting in the fusion cage in the fixing process. The holding and taking pressure clamp can be separated from the fusion device by pressing the front handle (the first clamp handle), and the holding and taking pressure clamp is taken down, and the operation is finished.

The foregoing is a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of improvements and decorations can be made without departing from the principle of the present invention, and these improvements and decorations should also be regarded as the protection scope of the present invention.

Claims

1. A split pressurized fusion cage comprising a front body portion and a rear cover portion for separate implantation into a human body, wherein:

2. A fusion system comprising a fusion device and a holding and taking pressure clamp, wherein the fusion device is a split pressure fusion device as claimed in claim 1, and the holding and taking pressure clamp comprises a first clamp body and a second clamp body which are hinged at the middle part, wherein:

3. The fusion system of claim 2, wherein the first and second clamp bodies each comprise a forward clamp head, a rearward handle, and a connecting rod between the clamp head and handle;

4. The fusion system defined in claim 3 wherein the instrument holding structures on the anterior body portion are receptacles on opposite sides of the posterior portion of the anterior body portion;

5. The fusion system according to claim 3, wherein the forceps head is provided with a depth-limiting clamping platform for abutting against the outer side of the vertebral body, and/or the rear parts of the first forceps body and the second forceps body are provided with springs for keeping the forceps head in a normally-closed state.

6. The fusion system of claim 3, wherein the connecting rod of the second clamp body comprises a straight rod section with a vertical clamping platform having a pair of resilient arms, the compression rod being slidably connected between the resilient arms.

7. The fusion system of claim 6, wherein the handle of the second jaw body has a length greater than a length of the handle of the first jaw body;

8. The fusion system of claim 7, wherein the linkage comprises a connecting block, a first link, and a second link, wherein:

9. The fusion system of claim 8, wherein the rear end of the compaction rod is of a reducing structure and comprises a large-diameter section at the front and a small-diameter section at the rear of the large-diameter section, and steel ball jackscrews are arranged at two sides of the blind hole and abut against the small-diameter section of the reducing structure in an initial state.

10. The fusion system of claim 2 wherein the front end of the compaction rod is a threaded section to which the compaction block is threaded;

11. The fusion system defined in claim 2 wherein the opening in the hollow bone graft window of the anterior body portion is trapezoidal and the anterior end of the posterior cover portion has a boss portion for capping over the opening, the boss portion also being trapezoidal.

12. The fusion system according to claim 2, wherein the connecting structure on the fusion device comprises threaded holes disposed on both sides of the front body portion, stepped through holes disposed on both sides of the rear cover portion and corresponding to the threaded holes, and screws for passing through the stepped through holes and the threaded holes.