WO2022178759A1

WO2022178759A1 - Fusion cage and installation tool therefor

Info

Publication number: WO2022178759A1
Application number: PCT/CN2021/077894
Authority: WO
Inventors: 郝定均; 刘明岩; 刘幸
Original assignee: 上海三友医疗器械股份有限公司
Priority date: 2021-02-25
Filing date: 2021-02-25
Publication date: 2022-09-01

Abstract

A fusion cage and an installation tool therefor. The fusion cage comprises a front side block (100), a middle block (200) and a rear side block (300), which are connected sequentially, wherein a front side face (240) of the middle block (200) and a rear side face (250) of the middle block (200) are both inclined planes, and the middle block (200) forms a structure with the size thereof gradually decreasing from right to left; the middle block (200) is provided with a first hollow inner cavity (210), the front side face (240) of the middle block (200) is provided with a front side receiving hole (220), and the rear side face (250) of the middle block (200) is provided with a rear side receiving hole (230); the front side face (240) of the middle block (200) is hinged to a rear side face (110) of the front side block (100); the rear side face (250) of the middle block (200) is hinged to a front side face (310) of the rear side block (300); the rear side face (110) of the front side block (100) is an inclined plane, the rear side face (110) of the front side block (100) is provided with a front limiting arm (111), and the front limiting arm (111) is inserted into the front side receiving hole (220); and the front side face (310) of the rear side block (300) is an inclined plane, the front side face (310) of the rear side block (300) is provided with a rear limiting arm (311), and the rear limiting arm (311) is inserted into the rear side receiving hole (230). When folded, the fusion cage can deform to be bent so as to adapt to the shape of an end plate of a vertebral body.

Description

Fusion and its installation tool

technical field

The invention relates to the technical field of medical instruments, in particular to a fusion cage and an installation tool thereof.

Background technique

At present, cages are needed to fuse adjacent vertebral bodies in some spinal surgeries, but the cages on the market are mainly rectangular and cannot be bent, so that the cage implanted in the intervertebral space does not match the shape of the endplate , unable to meet the needs of doctors.

SUMMARY OF THE INVENTION

In view of the above-mentioned shortcomings of the prior art, the technical problem solved by the present invention is to provide a cage and an installation tool thereof that can adapt to the shape of the endplate.

In order to achieve the above object and other related objects, the present invention provides a cage, comprising: an anterior block, a middle block and a posterior block connected in sequence;

The front side of the intermediate block and the rear side of the intermediate block are both inclined planes, and the intermediate block forms a structure whose size gradually decreases from right to left; the intermediate block has a first hollow inner cavity, The front side of the intermediate block is provided with a front receiving hole, and the rear side of the intermediate block is provided with a rear receiving hole;

The right edge of the front side of the intermediate block is hinged with the right edge of the rear side of the front block; the right edge of the rear side of the intermediate block is connected to the front side of the rear block. right edge hinged;

The rear side of the front side block is an inclined surface, and a front limit arm is provided on the rear side of the front side block, and the front limit arm is inserted into the front side receiving hole;

The front side of the rear side block is an inclined surface, and a rear limit arm is arranged on the front side of the rear block, and the rear limit arm is inserted into the rear side receiving hole;

The left side of the middle block, the left side of the front block and the left side of the rear block are all planes;

When the cage is not closed, the left side of the middle block, the left side of the anterior block and the left side of the posterior block are in the same plane;

When the cage is closed, the front side of the middle block is abutted with the rear side of the front side block; the rear side of the middle block is abutted with the front side of the rear side block.

Preferably, a first left groove is formed on the left side of the middle block, and a first right groove is formed on the right side of the middle block; The front end penetrates to the front side of the middle block, the rear end of the first left groove penetrates to the rear side of the middle block; the front end of the first right groove penetrates to the middle block. the front side, the rear end of the first right groove penetrates to the rear side of the middle block;

The left side surface of the front side block is provided with a second left side groove, and the right side surface of the front side block body is provided with a second right side groove; The end penetrates to the rear side of the front side block; the rear end of the second right groove penetrates to the rear side of the front side block;

The left side surface of the rear side block is provided with a third left side groove, the right side surface of the rear side block body is provided with a third right side groove; the front end of the third left side groove penetrate to the front side of the rear block, the rear end of the third left groove penetrates to the rear side of the rear block; the front end of the third right groove penetrates to the rear the front side of the side block, the rear end of the third right groove penetrates to the rear side of the rear side block;

The distance between the groove bottom surface of the first left groove and the groove bottom surface of the first right groove is equal to the distance between the groove bottom surface of the second left groove and the groove bottom of the second right groove The distance between the bottom surfaces, the distance between the groove bottom surface of the first left groove and the groove bottom surface of the first right groove is equal to the distance between the groove bottom surface of the third left groove and the third The distance between the groove bottom surfaces of the right groove;

When the cage is not closed, the first left groove, the second left groove and the third left groove are on the same straight line, and the first right groove, all the The second right groove and the third right groove are on the same straight line.

Preferably, the upper side of the intermediate block and the lower side of the intermediate block are provided with first openings, each of the first openings communicates with the first hollow cavity, and the The interior of the first hollow cavity is filled with a first hollow structure;

The front side block body has a second hollow inner cavity, the upper side surface of the front side block body and the lower side surface of the front side block body are provided with second openings, each of the second openings and the the second hollow cavity is communicated, and the inside of the second hollow cavity is filled with a second hollow structure;

The rear side block has a third hollow inner cavity, the upper side of the rear side block and the lower side of the rear side block are provided with third openings, each of the third openings and the The third hollow cavity is in communication, and the interior of the third hollow cavity is filled with a third hollow structure.

Preferably, a first mounting portion is provided on the right edge of the front side of the middle block, and a first mounting hole is provided on the first mounting portion, and the right edge of the rear side of the front block is provided with a first mounting portion. A first installation shaft is arranged on the upper part, and the first installation shaft is installed in the first installation hole;

The right edge of the rear side of the middle block is provided with a second mounting portion, the second mounting portion is provided with a second mounting hole, and the right edge of the front side of the rear block is provided with a second mounting portion. The second installation shaft is installed in the second installation hole.

Preferably, a chamfered portion is provided between the front side surface of the front side block and the right side surface of the front side block.

Preferably, the cage is made of elastic material.

The invention also relates to an installation tool for installing the cage, comprising a holder, the holder comprises a handle, the front end of the handle has two oppositely arranged holding rods, two The distance between the holding rods is equal to the distance between the groove bottom surface of the first left groove and the groove bottom surface of the first right groove.

As mentioned above, the fusion device of the present invention and its installation tool have the following beneficial effects:

In the cage of the present invention, the right edge of the front side of the intermediate block is hinged with the right edge of the rear side of the front block; the right edge of the rear side of the intermediate block is connected to the rear side The right edge of the front side of the block is hinged, so the cage can be bent and deformed, and when the cage is closed, the front side of the middle block is fitted with the rear side of the front block; the middle block The posterior side of the body fits with the anterior side of the posterior block, so when the cage is inserted between adjacent vertebral bodies, the cage can adapt to the shape of the endplates of the vertebral bodies.

Description of drawings

FIG. 1 is a schematic three-dimensional structural diagram of the cage of the present embodiment in an initial state.

FIG. 2 is a schematic three-dimensional structural diagram of the cage of the present embodiment in a closed state.

FIG. 3 is a schematic three-dimensional structure diagram of the holder of the present embodiment when the anterior block, the middle block and the posterior block of the cage are clamped.

FIG. 4 is a schematic three-dimensional structure diagram of the holder of the present embodiment when the middle block and the rear side block of the cage are clamped.

FIG. 5 is a schematic three-dimensional structure diagram of the holder of the present embodiment when the rear block of the cage is clamped

FIG. 6 is a schematic diagram showing the structure of the cage inserted into the intervertebral space between the vertebral bodies when the cage of this embodiment is in an initial state.

Fig. 7 is a schematic diagram showing the structure of the cage inserted into the intervertebral space between the vertebral bodies when the anterior block and the middle block of the cage of the present embodiment are attached.

FIG. 8 is a schematic three-dimensional structure diagram of the cage of the present embodiment in an initial state and no hollow unit is provided in the cage.

FIG. 9 shows a schematic diagram of the internal structure of the cage of the present embodiment when the cage is in an initial state and the cage is not provided with a hollow unit.

FIG. 10 is a schematic diagram showing an exploded three-dimensional structure of the cage of the present embodiment when the cage is in an initial state and no hollow unit is provided in the cage.

Figure 11 shows a schematic three-dimensional structure diagram when the anterior block and the middle block of the cage of the present embodiment are attached, and the cage is not provided with a hollow unit.

FIG. 12 shows a schematic three-dimensional structure diagram of the cage of the present embodiment when the cage is in a closed state and no hollow unit is provided in the cage.

FIG. 13 shows a schematic diagram of the internal structure of the cage of the present embodiment when the cage is in a closed state and the cage is not provided with a hollow unit.

Explanation of reference numerals

10 vertebral body

100 Anterior mass

110 The rear side of the front block

111 Front limit arm

120 Left side of front block

121 Second left groove

130 The right side of the front block

131 Second right groove

140 The second hollow cavity

141 Second opening

150 The upper side of the front block

160 The lower side of the front block

170 Front side of front block

180 Chamfer

200 Intermediate block

210 The first hollow inner cavity

211 The first opening

220 Front side receiving hole

230 Rear side receiving hole

240 The front side of the middle block

250 The rear side of the middle block

260 The left side of the middle block

261 First left groove

270 The right side of the middle block

271 First right groove

280 The upper side of the middle block

290 The lower side of the middle block

300 Posterior mass

310 The front side of the rear block

311 Rear limit arm

320 Left side of rear block

321 The third left groove

330 The right side of the rear block

331 Rear limit arm

340 The rear side of the rear block

350 The third hollow cavity

351 The third opening

360 The upper side of the rear block

370 The lower side of the rear block

400 hollow units

401 Trabecular bone

410 The first hollow structure

420 The second hollow structure

430 The third hollow structure

510 The first installation part

511 The first mounting hole

520 The first installation shaft

530 Second installation part

531 Second mounting hole

540 Second installation shaft

600 Holder

610 handle

620 Pole Holder

Detailed ways

The embodiments of the present invention are described below by specific embodiments, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

Please see attached image. It should be noted that the structures, proportions, sizes, etc. shown in the drawings in this specification are only used to cooperate with the contents disclosed in the specification, so as to be understood and read by those who are familiar with the technology, and are not used to limit the implementation of the present invention. Restricted conditions, it does not have technical substantive significance, any structural modification, proportional relationship change or size adjustment, without affecting the effect that the present invention can produce and the purpose that can be achieved, should still fall within the present invention. The disclosed technical content must be within the scope of coverage. At the same time, the terms such as "up", "down", "left", "right", "middle" and "one" quoted in this specification are only for the convenience of description and clarity, and are not used to limit this specification. The implementable scope of the invention, and the change or adjustment of the relative relationship thereof, shall also be regarded as the implementable scope of the present invention without substantially changing the technical content.

As shown in FIGS. 1 to 13 , the cage of this embodiment includes: an anterior block 100 , a middle block 200 and a posterior block 300 connected in sequence; an anterior block 100 , an intermediate block 200 and a posterior block 300 . The side blocks 300 are all hexahedral structures;

The front side surface 240 of the middle block body and the rear side surface 250 of the middle block body are both inclined surfaces inclined to the left, and the middle block body 200 forms a structure whose size gradually decreases from right to left; the middle block body 200 has a first hollow inner cavity 210 , the front side 240 of the middle block is provided with a front side receiving hole 220, and the rear side 250 of the middle block is provided with a rear side receiving hole 230;

The right edge of the front side 240 of the middle block is hinged with the right edge of the rear side 110 of the front block; the right edge of the rear side 250 of the middle block is hinged with the right edge of the front side 310 of the rear block hinged;

The rear side 110 of the front block is an inclined surface inclined to the left, and a front limit arm 111 is provided on the rear side 110 of the front block, and the front limit arm 111 is inserted into the front receiving hole 220;

The front side surface 310 of the rear side block is an inclined surface inclined to the left, the front side surface 310 of the rear side block body is provided with a rear limit arm 311, and the rear limit arm 311 is inserted into the rear side receiving hole 230;

The left side 260 of the middle block, the left side 120 of the front block and the left side 320 of the rear block are all planes;

When the cage is not closed, the left side 260 of the middle block, the left side 120 of the anterior block and the left side 320 of the posterior block are in the same plane;

When the cage is closed, the front side 240 of the middle block is abutted with the rear side 110 of the front block; the rear side 250 of the middle block is abutted with the front side 310 of the rear block.

In the cage of the present invention, the right edge of the front side 240 of the middle block is hinged with the right edge of the rear side 110 of the front block; The right edge of the front side 310 is hinged, so when the cage is in the initial state, if the cage is not closed, the front side 240 of the middle block does not fit with the rear side 110 of the front block; the rear side 250 of the middle block It does not fit with the anterior side 310 of the posterior block; when the cage is inserted into the intervertebral space, the front end of the cage touches the annulus fibrosus, the cage will be resisted by the annulus fibrosus, and the cage can deform and bend freely. Then continue to tap the cage, so that the cage advances along the direction of the annulus fibrosus to the position required by the doctor. At this time, since the cage is no longer subjected to external force, the cage is closed, and the front side 240 of the middle block is connected to the front side. The posterior side 110 of the block fits together, the posterior side 250 of the intermediate block fits with the anterior side 310 of the posterior block, and the cage can adapt to the shape of the endplate of the vertebral body 10 .

The cage is made of elastic material. In this embodiment, the elastic material is titanium alloy material. The fusion device is manufactured by 3D printing. When the cage collides with the annulus fibrosus and receives resistance, the anterior limiting arm 111 and the rear limiting arm 311 inserted into the cage will deform, and the anterior limiting arm 111 will further extend into the anterior receiving hole 220, and the rear The limiting arm 311 further extends into the rear side receiving hole 230 .

The front side receiving hole 220 is inclined with respect to the left side 260 of the middle block, and the side receiving hole 230 is inclined with respect to the left side 260 of the middle block, so that when the cage is closed, the front limit arm 111 can The rear limiting arm 311 can be stably inserted into the front receiving hole 220 , and the rear limiting arm 311 can be stably inserted into the rear receiving hole 230 .

A first left groove 261 is formed on the left side 260 of the middle block, and a first right groove 271 is formed on the right side 270 of the middle block; the front end of the first left groove 261 penetrates to the middle The front side 240 of the block, the rear end of the first left groove 261 penetrates to the rear side 250 of the middle block; the front end of the first right groove 271 penetrates to the front side 240 of the middle block, the first right side The rear end of the groove 271 penetrates to the rear side surface 250 of the middle block;

The left side 120 of the front block is provided with a second left groove 121, the right side 130 of the front block is provided with a second right groove 131; the rear end of the second left groove 121 penetrates to the rear side 110 of the front block; the rear end of the second right groove 131 penetrates to the rear side 110 of the front block;

The left side surface 320 of the rear side block is provided with a third left side groove 321, and the right side surface 330 of the rear side block body is provided with a third right side groove 331; the front end of the third left side groove 321 penetrates through To the front side 310 of the rear block, the rear end of the third left groove 321 penetrates to the rear side 340 of the rear block; the front end of the third right groove 331 penetrates to the front side 310 of the rear block , the rear end of the third right groove 331 penetrates to the rear side surface 340 of the rear side block;

The distance between the groove bottom surface of the first left groove 261 and the groove bottom surface of the first right groove 271 is equal to the distance between the groove bottom surface of the second left groove 121 and the groove bottom surface of the second right groove 131 . The distance between the groove bottom surface of the first left groove 261 and the groove bottom surface of the first right groove 271 is equal to the distance between the groove bottom surface of the third left groove 321 and the groove bottom surface of the third right groove 331 the distance between;

When the cage is not closed, the first left groove 261, the second left groove 121 and the third left groove 321 are on the same straight line, the first right groove 271, the second right groove 131 It is on the same line as the third right groove 331. This structure makes the cage form a long strip structure from front to back when the cage is not closed, and one of the holding rods 620 of the holding handle 610 extends into the third left side in turn. In the side groove 321 , the first left groove 261 and the second left groove 121 , the other holding rod 620 of the holding handle 610 extends into the third right groove 331 and the first right groove 271 in turn. And in the second right groove 131, the holding handle 610 can clamp the cage.

In order to facilitate processing, in this embodiment, the left side 260 of the middle block is parallel to the right side 270 of the middle block, and the upper side 280 of the middle block is parallel to the lower side 290 of the middle block; The left side 120 is parallel to the right side 130 of the front block, the upper side 150 of the front block is parallel to the lower side 160 of the front block, and the left side 120 of the front block is parallel to the front side block. The front side 170 is vertical; the left side 320 of the rear block is parallel to the right side 330 of the rear block, the upper side 360 of the rear block is parallel to the lower side 370 of the rear block, and the The left side 320 is perpendicular to the rear side 340 of the rear block. The upper side 280 of the middle block, the upper side 150 of the front side block and the upper side 360 of the rear side block are coplanar, and the lower side 290 of the middle block, the lower side 160 of the front side block and the rear side block are coplanar. The lower sides 370 are coplanar. This configuration also facilitates stable placement of the cage between adjacent vertebral bodies 10 .

The upper side 280 of the middle block and the lower side 290 of the middle block are provided with first openings 211 , each of the first openings 211 is communicated with the first hollow cavity 210 , and the interior of the first hollow cavity 210 Filled with a first hollow structure 410; the first hollow structure 410 enables bone and blood to enter the first hollow cavity 210 after the cage is implanted between adjacent vertebral bodies 10, effectively accelerating bone growth into the first hollow cavity 210 in the speed, improve the fusion rate.

The front side block 100 has a second hollow inner cavity 140 , and second openings 141 are provided on the upper side 150 of the front side block and the lower side 160 of the front side block. The hollow lumen 140 communicates with each other, and the interior of the second hollow lumen 140 is filled with a second hollow structure 420; the second hollow structure 420 enables bone and blood to enter the second hollow after the cage is implanted between the adjacent vertebral bodies 10. The speed in the cavity 140 effectively accelerates the growth of the bone into the second hollow cavity 140 and improves the fusion rate.

The rear side block 300 has a third hollow inner cavity 350. The upper side 360 of the rear side block and the lower side 370 of the rear side block are provided with third openings 351. The hollow cavity 350 is communicated, and the interior of the third hollow cavity 350 is filled with the third hollow structure 430 . The third hollow structure 430 enables the bone and blood to enter the third hollow cavity 350 after the cage is implanted between the adjacent vertebral bodies 10 , effectively accelerates the growth of bone into the third hollow cavity 350 and improves the fusion rate .

The first hollow structure 410, the second hollow structure 420 and the third hollow structure 430 all include a plurality of hollow units 400 connected, each hollow unit 400 includes a plurality of bone trabeculae 401, and all the hollow units 400 The first ends of the bone trabeculae 401 are connected, and the bone trabeculae 401 of the two adjacent hollow units 400 are connected. This structure enables all the hollow units 400 to have stable supporting force, and can further promote the fusion of bone and blood. The cage adopts 3D printing to manufacture the structure that can process the hollow unit, and can process the initial state of the cage assembly.

A first mounting portion 510 is provided on the right edge of the front side 240 of the middle block, a first mounting hole 511 is provided on the first mounting portion 510, and a first mounting hole 511 is provided on the right edge of the rear side 110 of the front block. an installation shaft 520, the first installation shaft 520 is installed in the first installation hole 511; this structure enables the middle block 200 to be stably connected to the front side block 100, and facilitates the rotation of the front side block 100 relative to the middle block 200 . In this embodiment, the number of the first mounting portion 510 and the first mounting hole 511 is two.

A second mounting portion 530 is provided on the right edge of the rear side 250 of the middle block, a second mounting hole 531 is provided on the second mounting portion 530, and a second mounting hole 531 is provided on the right edge of the front side 310 of the rear block. Two installation shafts 540 , the second installation shaft 540 is installed in the second installation hole 531 . This structure enables the middle block 200 to be stably connected to the rear side block 300 and facilitates the rotation of the rear side block 300 relative to the middle block 200 . In this embodiment, the number of the second mounting portion 530 and the second mounting hole 531 is two.

A chamfered portion 180 is provided between the front side 170 of the front block and the right side 130 of the front block. The setting of the chamfered portion 180 facilitates the insertion of the anterior side portion of the cage between the adjacent vertebral bodies 10 .

The present invention also relates to an installation tool for installing a cage, including a holder 600, the holder 600 includes a holding handle 610, and the front end of the holding handle 610 has two oppositely arranged holding rods 620. The distance between the rods 620 is equal to the distance between the groove bottom surface of the first left groove 261 and the groove bottom surface of the first right groove 271 .

The holding rod 620 of the holder 600 holds the cage. At this time, the cage is in the initial state, the cage is not closed, and the cage is limited by the holder 600 to a long strip. After the cage is driven into the intervertebral space, The cage is controlled on the percussion force line of the holder 600 to facilitate implantation. The front chamfer of the cage will touch the annulus fibrosus. After the cage feels the resistance of the annulus fibrosus, the cage can be held by the holder 600. After the lever 620 is adjusted backwards, so that the lever 620 of the holder 600 only clamps the middle block 200 and the rear side block 300, the cage can be freely deformed and bent, and the front side block 100 can be relative to the middle block 100. The block 200 is rotated; then the cage is tapped to make the cage advance in the direction of the outer circumference of the annulus fibrosus, and then the holding rod 620 of the holder 600 is adjusted backwards, so that the holding rod 620 of the holder 600 only clamps Hold the posterior block 300, and the middle block 200 can rotate relative to the posterior block 300; after that, continue to tap the cage to advance the cage in the direction of the outer circumference of the annulus fibrosus until the cage reaches the position required by the doctor. , and then adjust the holding rod 620 of the holder 600 backward, so that the holding rod 620 of the holder 600 releases the rear block 300, then the holder 600 is removed, and the subsequent finishing stage of the operation can be entered. .

The route to which the fusion device of this embodiment is applicable is PLIF or TLIF. The full name of PLIF is Posterior Lumbar Interbody Fusion, and the Chinese name is Posterior Lumbar Interbody Fusion. The full name of TLIF is Transforaminal Lumbar Interbody Fusion, and the Chinese name is Transforaminal Interbody Fusion.

In conclusion, the present invention effectively overcomes various shortcomings in the prior art and has high industrial utilization value.

The above-mentioned embodiments merely illustrate the principles and effects of the present invention, but are not intended to limit the present invention. Anyone skilled in the art can make modifications or changes to the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or changes made by those with ordinary knowledge in the technical field without departing from the spirit and technical idea disclosed in the present invention should still be covered by the claims of the present invention.

Claims

A cage, characterized in that it comprises: an anterior block (100), a middle block (200) and a posterior block (300) connected in sequence;

The front side (240) of the middle block and the rear side (250) of the middle block are both inclined planes, and the middle block (200) forms a structure whose size gradually decreases from right to left; the middle The block (200) has a first hollow inner cavity (210), the front side (240) of the intermediate block is provided with a front receiving hole (220), and the rear side (250) of the intermediate block is provided with a rear receiving hole hole(230);

The right edge of the front side (240) of the middle block is hinged with the right edge of the rear side (110) of the front block; the right edge of the rear side (250) of the middle block is connected to The right edge of the front side (310) of the rear side block is hinged;

The rear side (110) of the front side block is an inclined surface, and a front limit arm (111) is provided on the rear side (110) of the front block, and the front limit arm (111) is inserted into the in the front side receiving hole (220);

The front side (310) of the rear side block is an inclined surface, and a rear limit arm (311) is provided on the front side (310) of the rear block, and the rear limit arm (311) is inserted into the in the rear side receiving hole (230);

The left side (260) of the middle block, the left side (120) of the front block and the left side (320) of the rear block are all planes;

When the cage is not closed, the left side (260) of the middle block, the left side (120) of the anterior block and the left side (320) of the posterior block are in same plane;

When the cage is closed, the front side (240) of the middle block is in contact with the rear side (110) of the front block; the rear side (250) of the middle block The front sides (310) of the side blocks fit together.
The fusion device according to claim 1, wherein:

The left side (260) of the intermediate block is provided with a first left groove (261), and the right side (270) (270) of the intermediate block is provided with a first right groove (271) ; The front end of the first left groove (261) penetrates to the front side (240) of the middle block, and the rear end of the first left groove (261) penetrates to the middle block rear side (250); the front end of the first right groove (271) penetrates to the front side (240) of the middle block, and the rear end of the first right groove (271) penetrates to the middle the rear side of the block (250);

The left side surface (120) of the front side block is provided with a second left side groove (121), and the right side surface (130) of the front side block body is provided with a second right side groove (131); The rear end of the second left side groove (121) penetrates to the rear side surface (110) of the front side block; the rear end of the second right side groove (131) penetrates to the front side block The rear side (110) of the rear block; the left side (320) of the rear block is provided with a third left groove (321), and the right side (330) of the rear block is provided with a third groove (321). right groove (331); the front end of the third left groove (321) penetrates to the front side (310) of the rear block, and the rear end of the third left groove (321) penetrates to the rear side surface (340) of the rear side block; the front end of the third right side groove (331) penetrates to the front side surface (310) of the rear side block body, the third right side recess (331) The rear end of the groove (331) penetrates to the rear side surface (340) of the rear side block;

The distance between the groove bottom surface of the first left groove (261) and the groove bottom surface of the first right groove (271) is equal to the distance between the groove bottom surface of the second left groove (121) and the groove bottom surface of the second left groove (121). The distance between the groove bottom surfaces of the second right groove (131), the distance between the groove bottom surface of the first left groove (261) and the groove bottom surface of the first right groove (271) The distance is equal to the distance between the groove bottom surface of the third left groove (321) and the groove bottom surface of the third right groove (331);

When the cage is not closed, the first left groove (261), the second left groove (121) and the third left groove (321) are on the same straight line, so The first right groove (271), the second right groove (131) and the third right groove (331) are on the same straight line.
The fusion device according to claim 1, wherein:

The upper side surface (280) of the intermediate block and the lower side surface (290) of the intermediate block are provided with first openings (211), and each of the first openings (211) is connected with the first hollow interior. The cavity (210) is communicated, and the interior of the first hollow cavity (210) is filled with a first hollow structure (410);

The front side block (100) has a second hollow inner cavity (140), and second openings (141) are provided on both the upper side surface (150) of the front side block body and the lower side surface (160) of the front side block body ), each of the second openings (141) communicates with the second hollow cavity (140), and the second hollow cavity (140) is filled with a second hollow structure (420);

The rear side block (300) has a third hollow inner cavity (350), and third openings (351) are provided on both the upper side surface (360) of the rear side block body and the lower side surface (370) of the rear side block body ), each of the third openings (351) communicates with the third hollow cavity (350), and the interior of the third hollow cavity (350) is filled with a third hollow structure (420).
The fusion device according to claim 1, wherein:

A first mounting portion (510) is provided on the right edge of the front side surface (240) of the intermediate block, and a first mounting hole (511) is provided on the first mounting portion (510). A first installation shaft (520) is provided on the right edge of the rear side surface (110) of the block, and the first installation shaft (520) is installed in the first installation hole (511);

A second mounting portion (530) is provided on the right edge of the rear side surface (250) of the intermediate block, and a second mounting hole (531) is provided on the second mounting portion (530). A second installation shaft (540) is provided on the right edge of the front side surface (310) of the block, and the second installation shaft (540) is installed in the second installation hole (531).
The cage according to claim 1, characterized in that a chamfered portion (180) is provided between the front side (170) of the front block and the right side (130) of the front block.
The cage according to claim 1, wherein the cage is made of elastic material.
An installation tool for installing the cage according to claim 2, characterized by comprising a holder (600), the holder (600) comprising a handle (610), the handle ( The front end of 610) has two oppositely arranged holding rods (620), and the distance between the two holding rods (620) is equal to the groove bottom surface of the first left groove (261) and the first left groove (261). The distance between the groove bottom surfaces of a right groove (271).