CN210056354U - Expandable interbody fusion cage - Google Patents

Abstract

The utility model belongs to the technical field of interbody fusion cage medical instrument technique and specifically relates to an expandable interbody fusion cage, its characterized in that fuses board, the left traction plate, the preceding board that fuses on, fuses board, the back down fuse board, impels piece, connecting rod group to constitute by preceding lower fuse board, preceding upper fuse board, the back on fuse board, the back down fuse board be the L type respectively, the preceding lower fuse board of L type, preceding upper fuse board, back on fuse board, back down fuse board mutual lock back middle part form impel the chamber, the connecting rod constitute by last connecting rod, lower connecting rod, preceding connecting rod and back connecting rod, have the power of strutting that utilizes interbody fusion cage, resume the height and the tension of vertebra festival, realize relieving the oppression, resume the physiology curvature of spine, interbody fusion cage osseous fusion, advantages such as the guarantee backbone is stable.

Description

Expandable interbody fusion cage

Technical Field

The invention relates to the technical field of medical instruments of an interbody fusion cage, in particular to an expandable interbody fusion cage which utilizes the distraction force of the interbody fusion cage to recover the height and tension of vertebral segments, realizes the relief of compression, recovers the physiological curvature of the spine, ensures the bony fusion of the interbody fusion cage and ensures the stability of the spine.

Background

As is well known, in clinical orthopedics, spinal degeneration is common, and intervertebral disc degeneration, spinal stenosis, spondylolisthesis and spinal cord or nerve root compression are common, so that the patients need surgical treatment, the compression is thoroughly removed, the physiological curvature of the spine is restored, and the spinal stability is guaranteed. Other patients with spinal deformities, trauma, tumors, revision surgery and infections sometimes also undergo interbody fusion to stabilize the lumbar segment. The interbody fusion cage has better curative effect aiming at the spinal diseases, has simple operation, convenient use and high fusion rate, does not have complications of bone grafting fusion, is generally applied and clinical at present, but has the defects of low stability and the like of the existing interbody fusion cage.

Disclosure of Invention

The invention aims to solve the defects of the prior art and provide the expandable intervertebral fusion cage which utilizes the distraction force of the intervertebral fusion cage to recover the height and tension of vertebral segments, realizes the relief of compression, the recovery of physiological curvature of the spine, the bony fusion of the intervertebral fusion cage and the guarantee of the stability of the spine.

The technical scheme adopted by the invention for solving the technical problems is as follows:

the utility model provides an extensible interbody fusion cage, its characterized in that fuses board, left traction plate, preceding fusion plate, back on fusion plate, propulsion piece, connecting rod constitute down by preceding fusion plate, left traction plate, preceding fusion plate, back on fusion plate, the preceding fusion plate down, preceding fusion plate, back on fusion plate, back down fuse the board and be the L type respectively, preceding fusion plate, back on fusion plate, back down fuse the board each other after the middle part forms and impels the chamber, the connecting rod constitute by last connecting rod, lower connecting rod, front connecting rod and back connecting rod down, preceding fusion plate's left end down be equipped with left traction plate, left traction plate and preceding fusion plate mutually perpendicular and be equipped with the tractive screw at the middle part down, tractive and impel the chamber and communicate each other, preceding fusion plate's front side is equipped with the hinge that corresponds respectively down, preceding fusion plate and preceding fusion plate on fusion plate between the hinge that is equipped with make between lower fusion plate and preceding fusion plate down be equipped with between the hinge shaft and preceding fusion plate Prop up the preceding connecting rod of certain distance and hinge looks articulated, preceding going up fuse-plate the last side, the last side that goes up fuse-plate after and be equipped with the hinge that corresponds respectively, preceding going up fuse-plate, after go up fuse-plate between the hinge on be equipped with make before go up fuse-plate and after go up between the fuse-plate prop up certain distance with hinge looks articulated last connecting rod, the back go up fuse-plate the trailing flank, the back of fuse-plate down respectively correspond be equipped with the hinge, back go up fuse-plate, back down fuse-plate between the board hinge on be equipped with make after go up fuse-plate and back down prop up certain distance between the fuse-plate with hinge looks articulated back connecting rod, back down fuse-plate the downside, preceding lower fuse-plate the hinge of fuse-plate down be equipped with the hinge that corresponds respectively, back down fuse-plate, preceding lower fuse-plate be equipped with make after down between the fuse-plate down and before prop up certain distance with hinge looks articulated lower connecting rod down, preceding connecting rod, last connecting rod, back connecting rod and lower connecting rod slope respectively with preceding lower fusion board, preceding fusion board, the back on fuse the board down and connect each other staggeredly before making down fuse between the board, preceding fusion board, back on fuse the board, be the state of holding tightly down between the board, preceding fusion board, back on fuse the board down after the board each other lock the propulsion intracavity that middle part formed and be equipped with the propulsion piece, propulsion piece middle part be equipped with the bar hole, the bar downthehole implantation holder that is equipped with of planting, the implantation holder stretch into the bar downthehole tractive screw with left traction plate be connected, the rethread is implanted holder and is promoted to impel the piece and promote to get into before the propulsion intracavity realize down fusion board, preceding fusion board, back on fuse the board, back down to open between the fusion board.

The implant holder is composed of a handle, a traction rod, a push rod and a push knob, wherein the push rod is tubular, the right end of the handle is connected with the traction rod, the left end of the traction rod is provided with a pull thread matched with a left traction block, the right end of a front pull rod is provided with a push thread, the push knob is sleeved outside the push thread and is connected with the traction rod through a thread, the left end of the push knob is connected with the push rod sleeved outside the traction rod, and the distance between the left end of the push rod and the left end of the traction rod is reduced by rotating the push knob to realize the distance between the left traction plate and the push block.

The diameter of the push rod is larger than that of the strip-shaped hole of the push block, so that the push rod pushes against the side surface of the push block to push.

Hinge shafts of the front side and the upper side of the front upper fusion plate, the rear side and the upper side of the rear upper fusion plate, the front side and the lower side of the front lower fusion plate and the rear side and the lower side of the rear lower fusion plate are respectively arranged in avoidance grooves respectively arranged on the front side and the upper side of the front upper fusion plate, the rear side and the upper side of the rear upper fusion plate, the front side and the lower side of the front lower fusion plate and the rear side and the lower side of the rear lower fusion plate, the avoidance grooves are V-shaped, the adjacent V-shaped grooves are arranged in central symmetry, and the inclined front connecting rod, the inclined upper connecting rod, the inclined rear connecting rod and the inclined lower connecting rod are clamped in the spliced V-shaped grooves.

The two ends of the front connecting rod, the upper connecting rod, the rear connecting rod and the lower connecting rod are respectively provided with a connecting hole, the hinge shaft is hollow, the extended hinge shaft is extruded and turned over after penetrating through the connecting holes, and the straight-barrel hinge shaft is extruded to be in a state of being attached to the inclined chamfer of the connecting rod, so that the falling-off prevention is realized.

The right end of the inner side of the rear side plate of the rear upper fusion plate and the rear lower fusion plate is provided with a communicated clamping groove, the right end of the rear side surface of the pushing block is provided with a clamping convex block matched with the clamping groove, and the expanded fusion device is stably connected with the pushing block through the matched connection of the clamping groove and the clamping convex block.

The front lower fusion plate, the front upper fusion plate, the rear upper fusion plate and the rear lower fusion plate are in a tightly-held state that the right end of the front upper fusion device extends out of the right end of the front lower fusion device to enable the front connecting rod to incline towards the upper right direction, the right end of the rear upper fusion device extends out of the right end of the front upper fusion device to enable the upper connecting rod to incline towards the rear right direction, the right end of the rear lower fusion device is arranged between the right end of the front lower fusion device and the right end of the rear upper fusion device to enable the rear connecting rod to incline towards the upper right direction and the lower connecting rod to incline towards the rear right direction, and the front connecting rod, the upper connecting rod, the rear connecting rod and the lower connecting rod are rotated to be vertical to the front lower fusion plate, the front upper fusion plate, the rear upper fusion plate and the.

The upper side surface of the front lower fusion plate, the upper side surface of the front upper fusion plate, the lower side surface of the rear upper fusion plate and the lower side surface of the rear lower fusion plate are respectively provided with the sawtooth bosses, so that the stability of fixation between the front lower fusion plate, the front upper fusion plate, the rear upper fusion plate and the rear lower fusion plate and the intervertebral space is ensured, and the slippage is prevented.

The plant hole for the bone fusion material to enter is formed in the propelling block, so that the fusion cage can be conveniently fused with intervertebral bones.

The clamping groove and the clamping convex block can be respectively designed into inverted teeth or arc bulges or other shapes capable of realizing clamping, so that the slipping is prevented.

The interbody fusion cage comprises a front lower fusion plate, a left traction plate, a front upper fusion plate, a rear lower fusion plate, a propulsion block and a connecting rod, wherein the front lower fusion plate, the front upper fusion plate, the rear upper fusion plate and the rear lower fusion plate are respectively L-shaped, the L-shaped front lower fusion plate, the front upper fusion plate, the rear upper fusion plate and the rear lower fusion plate are mutually buckled, a propulsion cavity is formed in the middle of the L-shaped front lower fusion plate, the connecting rod comprises an upper connecting rod, a lower connecting rod, a front connecting rod and a rear connecting rod, the left traction plate is arranged at the left end of the front lower fusion plate, the left traction plate and the front lower fusion plate are mutually vertical, a traction screw hole is formed in the middle of the left traction plate, a strip-shaped hole is formed in the middle of the propulsion block, an implantation holder is arranged in the strip-shaped hole, the implantation holder is connected with the left traction plate, and the propulsion block is pushed into the propulsion cavity by the implantation holder, so that the propulsion block is pushed into the propulsion cavity to realize the front, The front upper fusion plate, the rear upper fusion plate and the rear lower fusion plate are opened in four directions, and the device has the advantages of recovering the height and tension of vertebral segments by utilizing the strutting force of the interbody fusion cage, relieving the compression, recovering the physiological curvature of the spine, realizing the bony fusion of the interbody fusion cage, ensuring the stability of the spine and the like.

Drawings

Fig. 1 is a schematic structural view before distraction, in which 1-1 is a front view before distraction, 1-2 is a top view before distraction,

fig. 2 is a schematic diagram of the present invention after being expanded, wherein 2-1 is a front view after being expanded, and 2-2 is a top view after being expanded.

FIG. 3 is a schematic view showing the construction of the front and lower fusion plates according to the present invention, wherein 3-1 is a perspective view and 3-2 is a perspective view in another direction.

Fig. 4 is a schematic structural view of the front upper fusion plate in the present invention, in which 4-1 is a perspective view and 4-2 is a perspective view in another direction.

Fig. 5 is a schematic structural view of the rear upper fusion plate in the present invention, wherein 5-1 is a perspective view and 5-2 is a perspective view in another direction.

FIG. 6 is a schematic view showing the construction of the lower rear fusion plate of the present invention, wherein 6-1 is a perspective view and 6-2 is a perspective view in the other direction.

Fig. 7 is a schematic structural view of the propulsion block of the present invention, in which fig. 7-1 is a perspective view and fig. 7-2 is a perspective view in another direction.

Fig. 8 is a schematic structural view of the connecting rod of the present invention, wherein 8-1 is a schematic structural view of a front connecting rod and a rear connecting rod, and 8-2 is a schematic structural view of an upper connecting rod and a lower connecting rod.

Figure 9 is a schematic view of the construction of the implant holder of the present invention.

Detailed Description

The invention is further described below with reference to the accompanying drawings:

as shown in the attached drawing, the expandable interbody fusion cage is characterized by comprising a front lower fusion plate 1, a left traction plate 2, a front upper fusion plate 3, a rear upper fusion plate 4, a rear lower fusion plate 5, a propulsion block 6 and a connecting rod 7, wherein the front lower fusion plate 1, the front upper fusion plate 3, the rear upper fusion plate 4 and the rear lower fusion plate 5 are respectively L-shaped, the L-shaped front lower fusion plate 1, the front upper fusion plate 3, the rear upper fusion plate 4 and the rear lower fusion plate 5 are mutually buckled to form a propulsion cavity at the rear middle part, the connecting rod 7 comprises an upper connecting rod, a lower connecting rod, a front connecting rod and a rear connecting rod, the left traction plate 2 is arranged at the left end of the front lower fusion plate 1, the left traction plate 2 and the front lower fusion plate 1 are mutually perpendicular in traction and provided with a screw hole 8 in the middle part, the traction screw hole 8 is mutually communicated with the propulsion cavity, the front side surface of the front lower fusion plate 1 is mutually perpendicular, The front side of the front upper fusion plate 3 is respectively and correspondingly provided with a hinge shaft 9, the hinge shaft 9 between the front lower fusion plate 1 and the front upper fusion plate 3 is provided with a front connecting rod which is hinged with the hinge shaft 9 and can support a certain distance between the front lower fusion plate 1 and the front upper fusion plate 3, the upper side of the front upper fusion plate 3 and the upper side of the rear upper fusion plate 4 are respectively and correspondingly provided with a hinge shaft 9, the hinge shaft 9 between the front upper fusion plate 3 and the rear upper fusion plate 4 is provided with an upper connecting rod which is hinged with the hinge shaft 9 and can support a certain distance between the front upper fusion plate 3 and the rear upper fusion plate 4, the rear side of the rear upper fusion plate 4 and the rear side of the rear lower fusion plate 5 are respectively and correspondingly provided with a hinge shaft 9, the hinge shaft 9 between the rear upper fusion plate 4 and the rear lower fusion plate 5 is provided with a rear connecting rod which is hinged with the hinge shaft 9 and can support a certain distance between the rear upper fusion plate 4 and the rear lower fusion plate 5, the downside of the lower fusion board 5 in back, preceding downside of lower fusion board 1 respectively the corresponding hinge 9 that is equipped with, the hinge 9 of lower fusion board 5 in back, preceding fusion board 1 under be equipped with make after the back fuse board 5 and before prop up between the fusion board 1 down with hinge 9 articulated lower connecting rod mutually, preceding connecting rod, last connecting rod, back connecting rod and lower connecting rod incline respectively and fuse board 1, preceding fusion board 3, back on fuse board 4, back under fuse board 5 stagger each other and connect between making before lower fusion board 1, preceding fusion board 3, back on fuse board 4, back under fuse between the board 5 and be the state of holding tightly, preceding fusion board 1, preceding fusion board 3, back on fuse board 4, back under fuse board 5 mutual lock after the intracavity that the middle part formed and be equipped with impel piece 6, impel piece 6 middle part be equipped with bar hole 10, bar hole 10 in be equipped with and plant the holder, the implantation holder is characterized in that a stretching strip-shaped hole 10 of the implantation holder is connected with a traction screw hole 8 in a left traction plate 2, a propulsion block 6 is pushed by the implantation holder to enter a propulsion cavity to realize four-way stretching of a front lower fusion plate 1, a front upper fusion plate 3, a rear upper fusion plate 4 and a rear lower fusion plate 5, the implantation holder consists of a handle 11, a traction rod 12, a propulsion rod 13 and a propulsion knob 14, the propulsion rod 13 is tubular, the right end of the handle 11 is connected with the traction rod 12, the left end of the traction rod 12 is arranged on a traction thread matched with the left traction block, the right end of the front traction rod is provided with a propulsion thread, the propulsion knob 14 is sleeved on the outer side of the propulsion thread, the propulsion knob 14 is connected with the traction rod 12 through threads, the left end of the propulsion knob 14 is connected with the propulsion rod 13 sleeved on the outer side of the traction rod 12, reduce the distance of pushing ram 13 left end and pulling ram 12 left end through rotating propulsion knob 14 and realize the distance between left traction plate 2 and the propulsion piece 6, the diameter of pushing ram 13 be greater than the diameter of the bar hole 10 of propulsion piece 6, make pushing ram 13 contradict and impel in propulsion piece 6 side, preceding leading flank and last side that fuses board 3, back on fuse board 4 and the trailing flank and the last side, preceding leading flank and the downside of board 1 down, the hinge 9 of trailing flank and the downside of board 5 down in the back establish respectively in preceding leading flank and last side, back on fuse board 4's trailing flank and last side, preceding leading flank and the downside of board 1 down fuse board 1 down, be equipped with respectively on the trailing flank and the downside of board 5 down in the back dodge in the groove 15 establish to the V type, adjacent V type groove be central symmetrical arrangement, make preceding connecting rod, upper connecting rod, back connecting rod and the lower connecting rod joint after the slope in the V type inslot of amalgamation, preceding connecting rod, upper connecting rod, back connecting rod and lower connecting rod's both ends be equipped with the connecting hole respectively, hinge 9 establish to hollow form, pass through hinge 9 behind the connecting hole and extrude the hinge 9 that stretches out and turn over all the time, extrude straight section of thick bamboo hinge for with the oblique chamfer laminating state of connecting rod to realize preventing deviating from, the inboard right-hand member of back side board of fusion board 4 and back lower fusion board 5 be equipped with and be linked together joint recess 16, the trailing flank right-hand member of propulsion block 6 be equipped with joint recess 16 matched with joint lug 17, fuse the ware after realizing strutting through joint recess 16 and joint lug 17 cooperation connection and be connected stably with propulsion block 6, preceding lower fusion board 1, preceding upper fusion board 3, back upper fusion board 4, back lower fusion board 5 hold tightly the state and make preceding connecting rod towards upper right side to the right-hand position of fusion ware for the right-hand member of preceding lower fusion ware stretches out The right end of the rear upper fusion device extends out of the right end of the front upper fusion device to enable the upper connecting rod to incline towards the rear right direction, the right end of the rear lower fusion device is arranged between the right end of the front lower fusion device and the right end of the rear upper fusion device to enable the rear connecting rod to incline towards the upper right direction and the lower connecting rod to incline towards the rear right direction, the front connecting rod, the upper connecting rod, the rear connecting rod and the lower connecting rod are rotated to be vertical to the front lower fusion plate 1, the front upper fusion plate 3, the rear upper fusion plate 4 and the rear lower fusion plate 5 through the spreading action of the propelling block 6, the upper side surface of the front lower fusion plate 1, the upper side surface of the front upper fusion plate 3, the lower side surface of the rear upper fusion plate 4 and the lower fusion plate 5 are respectively provided with a sawtooth boss 18, the stability of the fixing among the front lower fusion plate 1, the front upper fusion plate 3, the rear upper fusion plate 4, the rear lower fusion plate 5 and the intervertebral is ensured, the slipping is prevented, the plant hole 19 for the, the fusion cage is convenient to fuse with intervertebral bones, the clamping groove 16 and the clamping lug 17 can be respectively designed into inverted teeth or arc-shaped bulges or other shapes capable of realizing clamping, and the slippage is prevented.

When the invention is used, firstly, a front lower fusion plate 1, a left traction plate 2, a front upper fusion plate 3, a rear upper fusion plate 4, a rear lower fusion plate 5, a pushing block 6 and a connecting rod 7 are assembled, hinge shafts 9 respectively arranged on the front lower fusion plate 1, the front upper fusion plate 3, the rear upper fusion plate 4 and the rear lower fusion plate 5 are riveting flanging shafts, two ends of an upper connecting rod, a lower connecting rod, a front connecting rod and a rear connecting rod are respectively provided with riveting flanging holes, the fusion plates and the connecting rod 7 are assembled in a restraining way through the riveting flanging holes, so that the connecting rod 7 is firmly fixed on the fusion plates, the connecting rod 7 can axially rotate through the cooperation of the riveting shaft holes, the front lower fusion plate 1, the front upper fusion plate 3, the rear upper fusion plate 4 and the rear lower fusion plate 5 are in a holding state that the right end of the front upper fusion device extends out of the right end of the front lower fusion device to enable the front connecting rod to incline towards the right upper fusion device, and the right end of the rear upper fusion device extends out of the right fusion device to enable the upper fusion, the right end of the rear lower fusion cage is arranged between the right end of the front lower fusion cage and the right end of the rear upper fusion cage, so that the rear connecting rod inclines towards the upper right direction, the lower connecting rod inclines towards the rear right direction, when the distraction is carried out, the traction rod 12 in the implantation holder extends into the strip-shaped hole 10 of the propulsion block 6 to be connected with the left traction plate 2, then the distance between the left end part of the propulsion rod 13 and the left end part of the traction rod 12 is reduced by rotating the propulsion knob 14 to realize the distance between the left traction plate 2 and the propulsion block 6, then the connecting rod 7 rotates and expands along the riveting shaft in the process of gradually propelling the propulsion block 6, the front connecting rod, the upper connecting rod, the rear connecting rod and the lower connecting rod rotate to be vertical to the front lower fusion plate 1, the front upper fusion plate 3, the rear upper fusion plate 4 and the rear lower fusion plate 5 by the distraction of the propulsion block 6, the propulsion block 6 can play a supporting role to the fusion plate, the propulsion block 6 is provided with a clamping, the fusion plate is provided with a clamping groove 16 matched with the clamping convex block 17, after the propulsion block 6 is propelled, the clamping convex block 17 and the clamping groove 16 are mutually matched to prevent the propulsion block 6 from being separated from the fusion plate and realize the gradual opening action of the opening fusion device, an upper connecting rod and a lower connecting rod in the fusion plate are respectively set as a short connecting rod 7, a front connecting rod and a rear connecting rod are respectively set as a long connecting rod 7, the fusion plate, the traction block, the connecting rod and the propulsion block can be made of titanium alloy (Ti 6Al 4V), Peek (polyether ether ketone), ultra-high molecular polyethylene and other materials which are close to the elastic modulus of bone and are easily fused with human bones, when in use, the fusion plate and the connecting rod are made of titanium alloy, and the propulsion block can be Peek (polyether ether ketone); the product fusion plate and the connecting rod are Peek (polyether ether ketone) propulsion blocks which can be titanium alloy and the like in combined application, or the product fusion plate and the connecting rod are titanium alloy when in use, and the propulsion blocks can be ultrahigh molecular polyethylene; the fusion plate and the connecting rod of the product are Peek (polyether ether ketone) propulsion blocks which can be combined and applied by ultra-high molecular weight polyethylene, and the like, and the interbody fusion cage comprises a front lower fusion plate 1, a left traction plate 2, a front upper fusion plate 3, a rear upper fusion plate 4, a rear lower fusion plate 5, a propulsion block 6 and a connecting rod 7, wherein the front lower fusion plate 1, the front upper fusion plate 3, the rear upper fusion plate 4 and the rear lower fusion plate 5 are respectively L-shaped, the L-shaped front lower fusion plate 1, the front upper fusion plate 3, the rear upper fusion plate 4 and the rear lower fusion plate 5 are mutually buckled to form a propulsion cavity at the rear middle part, the connecting rod 7 comprises an upper connecting rod, a lower connecting rod, a front connecting rod and a rear connecting rod, the left traction plate 2 is arranged at the left end of the front lower fusion plate 1, the left traction plate and the front lower fusion plate 1 are mutually perpendicular and are provided with a traction screw hole 8 in the middle part, the propulsion block 6 is provided with a hole 10 in the middle part, the bar hole 10 in be equipped with and implant the holder, the person who implants the holder stretch into in the bar hole 10 with the left tractive screw 8 in the drawplate 2 be connected, the rethread is implanted the holder and is promoted the propulsion piece 6 and promote the entering propulsion intracavity and realize that fuse board 1, preceding upper fusion board 3, fuse board 4 on the back, fuse and open in the four directions between the board 5 down after, have the power of strutting that utilizes interbody fusion ware, resume the height and the tension of vertebra festival, realize relieving oppression, resume the physiological curvature of vertebra, interbody fusion ware bony fusion, advantages such as the stable of guarantee backbone.

Claims (10)

1. The utility model provides an extensible interbody fusion cage, its characterized in that fuses board, left traction plate, preceding fusion plate, back on fusion plate, propulsion piece, connecting rod constitute down by preceding fusion plate, left traction plate, preceding fusion plate, back on fusion plate, the preceding fusion plate down, preceding fusion plate, back on fusion plate, back down fuse the board and be the L type respectively, preceding fusion plate, back on fusion plate, back down fuse the board each other after the middle part forms and impels the chamber, the connecting rod constitute by last connecting rod, lower connecting rod, front connecting rod and back connecting rod down, preceding fusion plate's left end down be equipped with left traction plate, left traction plate and preceding fusion plate mutually perpendicular and be equipped with the tractive screw at the middle part down, tractive and propulsion chamber mutually communicate, preceding fusion plate's front side down, preceding fusion plate's front side on fusion plate's front side respectively correspond be equipped with the hinge, preceding fusion plate and preceding fusion plate down be equipped with on fusion plate between hinge make preceding fusion plate down on fusion plate before the fusion plate before be equipped with down fuse the hinge plate and fuse the hinge plate on the hinge plate and on the front and on be equipped The preceding connecting rod with hinge looks articulated of propping up the certain distance between, preceding last fusion board on the last side of last fusion board, after on the last side of fusion board respectively correspond be equipped with the hinge, preceding last fusion board, after on be equipped with before making between last fusion board and the last fusion board on the hinge prop up the certain distance with hinge looks articulated last connecting rod, the back of going up fusion board, the back of back down fusion board respectively correspond be equipped with the hinge, back on be equipped with the back connecting rod with hinge looks articulated between fusion board under making between last fusion board after and the fusion board under back on the hinge between fusion board, back down be equipped with make after go up fusion board and back down prop up the certain distance between the fusion board under the hinge, the back under fuse the downside of board, the downside of preceding lower fusion board respectively correspond be equipped with the hinge, back under be equipped with the fusion board, the hinge of preceding lower fusion board under be equipped with make after down between fusion board and before prop up the certain distance with hinge looks articulated lower connecting rod with the hinge, preceding connecting rod, last connecting rod, back connecting rod and lower connecting rod slope respectively with preceding lower fusion board, preceding fusion board, the back on fuse the board down and stagger each other and connect each other and make preceding lower fusion board, preceding fusion board, back on fuse the board, be the state of holding tightly down between the board after, preceding lower fusion board, preceding fusion board, back on fuse the board down after the mutual lock of board after, be equipped with the propulsion piece in the propulsion intracavity that middle part formed, propulsion piece middle part be equipped with the bar hole, the bar downthehole drive that is equipped with of driving impels the propulsive piece propulsive holder, the implantation holder stretch into the bar downthehole tractive screw that is connected with left traction plate in, rethread implantation holder promotes to impel the piece and promotes to get into before the realization of propulsion intracavity fusion board, preceding upper fusion board, back on fuse the board, after open down and fuse the board between the board quadriversal.

2. The expandable interbody fusion cage of claim 1, wherein the implant holder comprises a handle, a traction rod, a pushing rod and a pushing knob, the pushing rod is tubular, the right end of the handle is connected with the traction rod, the left end of the traction rod is provided with a pulling thread matched with the left traction block, the right end of the traction rod is provided with a pushing thread, the pushing knob is sleeved outside the pushing thread and connected with the traction rod through a thread, the left end of the pushing knob is connected with the pushing rod sleeved outside the traction rod, and the distance between the left end of the pushing rod and the left end of the traction rod is reduced by rotating the pushing knob to realize the distance between the left traction plate and the pushing block.

3. An expandable interbody fusion cage according to claim 2, wherein the push rod has a diameter larger than the diameter of the slot of the push block, such that the push rod pushes against the side of the push block.

4. An expandable interbody fusion cage according to claim 1, wherein hinge shafts of the front and upper sides of the front upper fusion plate, the rear and upper sides of the rear upper fusion plate, the front and lower sides of the front lower fusion plate, the rear and lower sides of the rear lower fusion plate are respectively provided in escape grooves respectively provided on the front and upper sides of the front upper fusion plate, the rear and upper sides of the rear upper fusion plate, the front and lower sides of the front lower fusion plate, and the rear and lower sides of the rear lower fusion plate, the escape grooves are V-shaped, the adjacent V-shaped grooves are arranged in a central symmetry manner, so that the inclined front, upper, rear and lower connecting rods are engaged in the engaged V-shaped grooves.

5. The expandable intervertebral fusion cage of claim 1, wherein the front, upper, rear and lower connecting rods have connecting holes at both ends thereof, and the hinge shaft is hollow, and the straight hinge shaft is pressed to be fitted with the connecting rod bevel by pressing the hinge shaft through the connecting holes, thereby preventing the escape.

6. The expandable interbody fusion cage of claim 1, wherein the rear upper fusion plate and the rear lower fusion plate have a clamping groove at the right end of the inner side of the rear side plate, the pushing block has a clamping protrusion at the right end of the rear side surface, the clamping protrusion is engaged with the clamping groove, and the clamping groove and the clamping protrusion are engaged with each other to achieve stable connection between the expanded interbody fusion cage and the pushing block.

7. The expandable intervertebral fusion cage of claim 1, wherein the front lower fusion plate, the front upper fusion plate, the rear upper fusion plate, and the rear lower fusion plate are held in a state in which a right end of the front upper fusion plate extends out of a right end of the front lower fusion plate to incline the front link in an upper right direction, a right end of the rear upper fusion plate extends out of a right end of the front upper fusion plate to incline the upper link in a rear right direction, a right end of the rear lower fusion plate is disposed between the right end of the front lower fusion plate and the right end of the rear upper fusion plate to incline the rear link in an upper right direction, and the lower link is inclined in a rear right direction.

8. The expandable interbody fusion cage of claim 1, wherein the upper side of the front lower fusion plate, the upper side of the front upper fusion plate, the lower side of the rear upper fusion plate, and the lower side of the rear lower fusion plate are respectively provided with a saw-tooth boss to ensure the stability of the fixation between the front lower fusion plate, the front upper fusion plate, the rear lower fusion plate and the interbody, and prevent the intervertebral from slipping.

9. An expandable intervertebral fusion as claimed in claim 1 wherein the pushing block is provided with plant holes for the entry of bony fusion material to facilitate fusion of the fusion with the intervertebral bones.

10. The expandable intervertebral fusion device of claim 6, wherein the locking groove and the locking protrusion are respectively configured as an inverted tooth or an arc protrusion or a shape capable of realizing locking.

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