CN109820627B - Expandable interbody fusion cage - Google Patents
Expandable interbody fusion cage Download PDFInfo
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- CN109820627B CN109820627B CN201910276216.3A CN201910276216A CN109820627B CN 109820627 B CN109820627 B CN 109820627B CN 201910276216 A CN201910276216 A CN 201910276216A CN 109820627 B CN109820627 B CN 109820627B
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- 230000004927 fusion Effects 0.000 title claims abstract description 380
- 210000000988 bone and bone Anatomy 0.000 claims description 10
- 239000007943 implant Substances 0.000 claims description 9
- 239000000463 material Substances 0.000 claims description 4
- 238000002513 implantation Methods 0.000 description 11
- 239000004696 Poly ether ether ketone Substances 0.000 description 4
- 229920002530 polyetherether ketone Polymers 0.000 description 4
- 239000004698 Polyethylene Substances 0.000 description 3
- 229910001069 Ti alloy Inorganic materials 0.000 description 3
- 230000006837 decompression Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- -1 polyethylene Polymers 0.000 description 3
- 229920000573 polyethylene Polymers 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 206010061246 Intervertebral disc degeneration Diseases 0.000 description 1
- 206010028980 Neoplasm Diseases 0.000 description 1
- 208000031481 Pathologic Constriction Diseases 0.000 description 1
- 206010058907 Spinal deformity Diseases 0.000 description 1
- 208000020307 Spinal disease Diseases 0.000 description 1
- 208000007103 Spondylolisthesis Diseases 0.000 description 1
- JUPQTSLXMOCDHR-UHFFFAOYSA-N benzene-1,4-diol;bis(4-fluorophenyl)methanone Chemical compound OC1=CC=C(O)C=C1.C1=CC(F)=CC=C1C(=O)C1=CC=C(F)C=C1 JUPQTSLXMOCDHR-UHFFFAOYSA-N 0.000 description 1
- 230000007850 degeneration Effects 0.000 description 1
- 208000014674 injury Diseases 0.000 description 1
- 210000004705 lumbosacral region Anatomy 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 210000000278 spinal cord Anatomy 0.000 description 1
- 210000000273 spinal nerve root Anatomy 0.000 description 1
- 230000036262 stenosis Effects 0.000 description 1
- 208000037804 stenosis Diseases 0.000 description 1
- 238000001356 surgical procedure Methods 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- 230000008733 trauma Effects 0.000 description 1
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Abstract
The invention relates to the technical field of medical appliances of interbody fusion devices, in particular to an expandable interbody fusion device, which is characterized by comprising a front lower fusion plate, a left traction plate, a front upper fusion plate, a rear lower fusion plate, a propelling 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 middle parts of 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 to form a propelling cavity, and the connecting rod comprises an upper connecting rod, a lower connecting rod, a front connecting rod and a rear connecting rod.
Description
Technical Field
The invention relates to the technical field of medical appliances of an intervertebral fusion device, in particular to an expandable intervertebral fusion device which utilizes the expanding force of the intervertebral fusion device to restore the height and tension of vertebral segments, realize the decompression, restore the physiological curvature of the spine, realize the osseous fusion of the intervertebral fusion device and ensure the stability of the spine.
Background
As is well known, clinical spinal degeneration in orthopaedics is common, and the spinal disc degeneration, spinal canal stenosis, spondylolisthesis and the person who presses spinal cord or nerve root often need operation treatment, thoroughly remove the pressing, restore the physiological curvature of the spine and ensure the spinal stability. Other spinal deformities, trauma, tumors, revision surgery, and infected patients sometimes require interbody fusion to stabilize the lumbar spine segment. The intervertebral fusion device has better curative effect on the above spinal diseases, has simple operation, convenient use, high fusion rate and no complications of bone grafting fusion, is widely applied and clinically at present, but has the defects of low stability and the like of the existing intervertebral fusion device.
Disclosure of Invention
The invention aims to solve the defects of the prior art, and provides an expandable intervertebral fusion device which utilizes the expanding force of the intervertebral fusion device to restore the height and tension of the vertebral segments, realize the decompression, restore the physiological curvature of the vertebra, realize the osseous fusion of the intervertebral fusion device and ensure the stability of the vertebral column.
The technical scheme adopted for solving the technical problems is as follows:
the expandable interbody fusion cage is characterized by comprising a front lower fusion plate, a left traction plate, a front upper fusion plate, a rear lower fusion plate, a pushing 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 front lower fusion plate, the front upper fusion plate, the rear upper fusion plate and the rear lower fusion plate are mutually buckled to form a pushing cavity in the middle, the connecting rod consists of an upper connecting rod, a lower connecting rod, a front connecting rod and a rear connecting rod, the left end of the front lower fusion plate is provided with the left traction plate, the left traction plate is mutually perpendicular to the front lower fusion plate and is provided with a traction screw hole in the middle, the traction screw hole is mutually communicated with the pushing cavity, the front side surface of the front lower fusion plate and the front side surface of the front upper fusion plate are respectively correspondingly provided with a hinge shaft, the hinge between the front lower fusion plate and the front upper fusion plate is provided with a front connecting rod which enables the front lower fusion plate and the front upper fusion plate to prop up a certain distance and is hinged with the hinge, the upper side of the front upper fusion plate and the upper side of the rear upper fusion plate are respectively and correspondingly provided with a hinge, the hinge between the front upper fusion plate and the rear upper fusion plate is provided with an upper connecting rod which enables the front upper fusion plate and the rear upper fusion plate to prop up a certain distance and is hinged with the hinge, the rear side of the rear upper fusion plate and the rear side of the rear lower fusion plate are respectively and correspondingly provided with a hinge, the hinge between the rear upper fusion plate and the rear lower fusion plate is provided with a rear connecting rod which enables the rear upper fusion plate and the rear lower fusion plate to prop up a certain distance and is hinged with the hinge, the lower side of the rear lower fusion plate and the lower side of the front lower fusion plate are respectively and correspondingly provided with a hinge, the rear lower fusion plate, the hinge of the front lower fusion plate is provided with a lower connecting rod which enables the rear lower fusion plate and the front lower fusion plate to prop up a certain distance and is hinged with the hinge, the front connecting rod, the upper connecting rod, the rear connecting rod and the lower connecting rod are respectively inclined and connected with the front lower fusion plate, the front upper fusion plate, the rear upper fusion plate and the rear lower fusion plate in a mutually staggered manner, so that the front lower fusion plate, the front upper fusion plate, the rear upper fusion plate and the rear lower fusion plate are in a clasping state, a pushing block is arranged in a pushing cavity formed in the middle of the front lower fusion plate, the front upper fusion plate, the rear upper fusion plate and the rear lower fusion plate after being mutually buckled, a bar hole is formed in the middle of the pushing block, an implantation holder is arranged in the bar hole, the implantation holder is connected with a pulling screw hole in the left pulling plate, and the pushing block is pushed into the pushing cavity by the implantation holder, so that four-way opening between the front lower fusion plate, the front upper fusion plate, the rear upper fusion plate and the rear lower fusion plate is realized.
The implant holder consists of a handle, a traction rod, a pushing rod and a pushing knob, wherein the pushing rod is in a tubular shape, the right end of the handle is connected with the traction rod, the left end of the traction rod is provided with a traction thread matched with a left traction block, the right end of the front traction rod is provided with the pushing thread, the pushing knob is sleeved on the outer side of the pushing thread, the pushing knob is connected with the traction rod through threads, the left end of the pushing knob is connected with the pushing rod sleeved on the outer side of the traction rod, and the distance between the left traction plate and the pushing block is realized by rotating the pushing knob to reduce the distance between the left end of the pushing rod and the left end of the traction rod.
The diameter of the pushing rod is larger than that of the strip-shaped hole of the pushing block, so that the pushing rod is abutted against the side face of the pushing block to push.
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 hinge shafts of 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, wherein the avoidance grooves are arranged in a V shape, and adjacent V-shaped grooves are arranged in a central symmetry manner, so that the inclined front connecting rod, the upper connecting rod, the rear connecting rod and the 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 the connecting holes, the hinge shaft is hollow, the extended hinge shaft is extruded and turned over after passing through the connecting holes, and the straight cylinder hinge shaft is extruded to be in a state of being attached to the inclined chamfer of the connecting rod, so that the anti-falling-out 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 the communicated clamping groove, the right end of the rear side surface of the pushing block is provided with the clamping convex block matched with the clamping groove, and the fusion device and the pushing block are stably connected after being unfolded 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 clasping state, wherein the right end of the front upper fusion plate extends out of the right end of the front lower fusion plate to enable the front connecting rod to incline towards the right, the right end of the rear upper fusion plate extends out of the right end of the front upper fusion plate to enable the upper connecting rod to incline towards the rear right, the right end of the rear lower fusion plate is arranged between the right end of the front lower fusion plate and the right end of the rear upper fusion plate to enable the rear connecting rod to incline towards the right, and the lower connecting rod is inclined towards the rear right.
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 zigzag boss, so that the stability of fixation among the front lower fusion plate, the front upper fusion plate, the rear lower fusion plate and the intervertebral is ensured, and the slipping is prevented.
The plant holes for the bone fusion material to enter are formed in the pushing block, so that the fusion device and the intervertebral bone fusion are facilitated.
The clamping grooves and the clamping convex blocks can be respectively provided with inverted teeth or arc-shaped bulges or other shapes capable of realizing clamping, so that slipping is prevented.
The invention is characterized in that the interbody fusion cage consists of a front lower fusion plate, a left traction plate, a front upper fusion plate, a rear lower fusion plate, a propelling 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, the rear middle part forms a propelling cavity, the connecting rod consists of an upper connecting rod, a lower connecting rod, a front connecting rod and a rear connecting rod, the left end of the front lower fusion plate is provided with the left traction plate, the left traction plate is mutually perpendicular to the front lower fusion plate, and the middle part is provided with a traction screw hole, the middle part of the pushing block is provided with a bar hole, an implantation holder is arranged in the bar hole, the implantation holder stretches into the bar hole to be connected with a traction screw hole in a left traction plate, and the pushing block is pushed by the implantation holder to push the pushing block into a pushing cavity to realize four-way expansion between a front lower fusion plate, a front upper fusion plate, a rear upper fusion plate and a rear lower fusion plate.
Drawings
Fig. 1 is a schematic view of the structure of the present invention before being opened, wherein 1-1 is a front view before being opened, 1-2 is a top view before being opened,
fig. 2 is a schematic view of the expanded structure of the present invention, wherein 2-1 is a front view after expansion, and 2-2 is a top view after expansion.
FIG. 3 is a schematic view showing the structure of the front lower fusion plate according to the present invention, wherein 3-1 is a perspective view and 3-2 is another perspective view.
FIG. 4 is a schematic view showing the structure of the upper front fusion plate according to the present invention, wherein 4-1 is a perspective view and 4-2 is another perspective view.
FIG. 5 is a schematic view showing the structure of the rear upper fusion plate according to the present invention, wherein 5-1 is a perspective view and 5-2 is another perspective view.
FIG. 6 is a schematic view showing the structure of the rear lower fusion plate according to 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 according to the present invention, wherein 7-1 is a perspective view and 7-2 is another perspective view.
Fig. 8 is a schematic structural view of the connecting rod in the present invention, wherein 8-1 is a schematic structural view of the front and rear connecting rods, and 8-2 is a schematic structural view of the upper and lower connecting rods.
Fig. 9 is a schematic view of the structure of the implant holder according to the present invention.
Detailed Description
The invention is further described below with reference to the accompanying drawings:
as shown in the 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 front lower fusion plate 1, the front upper fusion plate 3, the rear upper fusion plate 4 and the rear lower fusion plate 5 of the L-shape are mutually buckled to form a propulsion cavity at the rear middle part, the connecting rod 7 consists of an upper connecting rod, a lower connecting rod, a front connecting rod and a rear connecting rod, the left end of the front lower fusion plate 1 is provided with the left traction plate 2, the left traction plate 2 is mutually perpendicular to the front lower fusion plate 1, the traction screw hole 8 is arranged at the middle part, the traction screw hole 8 is mutually communicated with the propulsion cavity, the front side of the front lower fusion plate 1 and the front side of the front upper fusion plate 3 are 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 enables the front lower fusion plate 1 and the front upper fusion plate 3 to prop up a certain distance and is hinged with the hinge shaft 9, 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 the 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 enables the front upper fusion plate 3 and the rear upper fusion plate 4 to prop up a certain distance and is hinged with the hinge shaft 9, 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 the hinge shaft 9, the rear upper fusion plate 4, the hinge shaft 9 between the rear lower fusion plate 5 is provided with a rear connecting rod which enables the rear upper fusion plate 4 and the rear lower fusion plate 5 to prop up a certain distance and is hinged with the hinge shaft 9, the lower side surface of the rear lower fusion plate 5 and the lower side surface of the front lower fusion plate 1 are respectively correspondingly provided with the hinge shaft 9, the hinge shaft 9 of the rear lower fusion plate 5 and the hinge shaft 9 of the front lower fusion plate 1 is provided with a lower connecting rod which enables the rear lower fusion plate 5 and the front lower fusion plate 1 to prop up a certain distance and is hinged with the hinge shaft 9, the front connecting rod, the upper connecting rod, the rear connecting rod and the lower connecting rod are respectively inclined and mutually staggered and connected with 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 to enable 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 to be in a clasping state, 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 mutually buckled, a propulsion block 6 is arranged in a propulsion cavity formed in the rear middle, a strip-shaped hole 10 is formed in the middle of the propulsion block 6, an implantation holder is arranged in the strip-shaped hole 10, the implantation holder stretches into the strip-shaped hole 10 to be connected with a traction screw hole 8 in the left traction plate 2, the propulsion block 6 is pushed by the implantation holder to push the propulsion block 6 into the propulsion cavity to realize four-way expansion among 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, 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 in a tubular shape, the right end of the handle 11 is connected with the traction rod 12, the left end of the traction rod 12 is provided with traction threads matched with the left traction block, the right end of the front traction rod is provided with propulsion threads, the outside of the propelling thread is sleeved with a propelling knob 14, the propelling knob 14 is connected with a traction rod 12 through threads, the left end of the propelling knob 14 is connected with a propelling rod 13 sleeved on the outside of the traction rod 12, the distance between the left traction plate 2 and the propelling block 6 is realized by reducing the distance between the left end part of the propelling rod 13 and the left end part of the traction rod 12 through rotating the propelling knob 14, the diameter of the propelling rod 13 is larger than that of a strip-shaped hole 10 of the propelling block 6, so that the propelling rod 13 props against the side surface of the propelling block 6 to propel, the front side surface and the upper side surface of the front upper fusion plate 3, the rear side surface and the upper side surface of the rear upper fusion plate 4, the front side surface and the lower side surface of the front lower fusion plate 1, the hinge shafts 9 of the rear side surface and the lower side surface of the rear lower fusion plate 5 are respectively arranged in avoidance grooves 15 respectively arranged on the front side surface and the upper side surface of the front upper fusion plate 3, the rear side surface and the upper side surface of the rear upper fusion plate 4, the front side surface and the lower side surface of the front lower fusion plate 1, and the rear side surface of the rear lower fusion plate 5, the avoidance groove 15 is arranged in a V shape, the adjacent V-shaped grooves are arranged in a central symmetry way, the inclined front connecting rod, the upper connecting rod, the rear connecting rod and the lower connecting rod are clamped in the spliced V-shaped grooves, connecting holes are respectively arranged at two ends of the front connecting rod, the upper connecting rod, the rear connecting rod and the lower connecting rod, the hinge shaft 9 is hollow, the extended hinge shaft 9 is extruded and turned through the hinge shaft 9 passing through the connecting holes, the straight barrel hinge shaft is extruded to be in a joint state with the inclined chamfer of the connecting rod, so that the anti-falling is realized, the right ends of the inner sides of the rear side plates of the rear upper fusion plate 4 and the rear lower fusion plate 5 are provided with clamping grooves 16 which are communicated with each other, the right ends of the rear side surfaces of the propulsion blocks 6 are provided with clamping convex blocks 17 which are matched with the clamping grooves 16, the opened fusion device is connected with the pushing block 6 stably through the matched connection of the clamping groove 16 and the clamping convex block 17, the clasping state of 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 is that the right end of the front upper fusion device stretches out of the right end of the front lower fusion device to enable the front connecting rod to incline towards the right direction, the right end of the rear upper fusion device stretches 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 right direction, 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 in a vertical state with 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 opening action of the pushing block 6, 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 provided with a zigzag boss 18 on the upper side, the lower side and the lower side of 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 space, the stability of fixation is ensured, the slippage is prevented, the propulsion block 6 is provided with a plant hole 19 for bone fusion materials to enter, the fusion device and the intervertebral bone fusion are facilitated, the clamping groove 16 and the clamping convex block 17 can be respectively provided with a pawl, an arc-shaped bulge or other shapes capable of realizing clamping, and the rear sides of the upper side and the lower side of the propulsion block are respectively provided with a strip-shaped elastic hole, so that the clamping boss on the propulsion block is convenient to insert into the propulsion groove.
When the invention is used, the front lower fusion plate 1, the left traction plate 2, the front upper fusion plate 3, the rear upper fusion plate 4, the rear lower fusion plate 5, the pushing block 6 and the 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 rivet-pressing flanging shafts, two ends of the upper connecting rod, the lower connecting rod, the front connecting rod and the rear connecting rod are respectively provided with rivet-pressing flanging holes, the fusion plate and the connecting rod 7 are assembled in a constraint manner through rivet-pressing flanging, so that the connecting rod 7 is firmly fixed on the fusion plate, and the connecting rod 7 can axially rotate through the rivet-pressing shaft holes, the clasping state of 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 is that the right end of the front upper fusion plate extends out of the right end of the front lower fusion device to enable the front connecting rod to incline towards the right upper 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 right upper direction, the lower connecting rod is inclined towards the rear right direction, when the rear upper fusion device is unfolded, a traction rod 12 in an implantation device is stretched into a strip-shaped hole 10 of a propulsion block 6 to be connected with a left traction plate 2, then the distance between the left traction plate 2 and the propulsion block 6 is realized by reducing the distance between the left end part of a propulsion rod 13 and the left end part of the traction rod 12 by rotating a propulsion knob 14, then in the gradual propulsion process of the propulsion block 6, the connecting rod 7 rotates and expands along a riveting shaft, the front connecting rod, the upper connecting rod, the rear connecting rod and the lower connecting rod rotate to be in a vertical state with 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 opening effect of the propulsion block 6, the pushing block 6 can support the fusion plate after pushing, the pushing block 6 is provided with a clamping projection 17, the fusion plate is provided with a clamping groove 16 matched with the clamping projection 17, when the pushing block 6 is pushed, the clamping projections 17 are mutually matched with the clamping groove 16 to prevent the pushing block 6 from falling out of the fusion plate and realize the gradual opening effect of the opening fusion device, the upper connecting rod and the lower connecting rod are respectively provided with a short connecting rod 7, the front connecting rod and the rear connecting rod are respectively provided with a long connecting rod 7, the fusion plate, the pulling speed, the connecting rods and the pushing block can be made of titanium alloy (Ti 6Al 4V), peek (polyether ether ketone), ultrahigh molecular polyethylene and other materials which are close to the modulus of elasticity of bones are easily fused with bones of human bodies, and when in use, the product fusion plate and the connecting rods are made of titanium alloy, and the pushing block can be made of Peek (polyether ether ketone); the product fusion plate and the connecting rod are combined application such as titanium alloy, and the PEEK propulsion block can be ultra-high molecular polyethylene; the invention relates to a product fusion plate and a connecting rod are combined application of Peek (polyether ether ketone) propulsion blocks, which can be ultrahigh molecular polyethylene and the like, and the interbody fusion cage consists of 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 front lower fusion plate 1, the front upper fusion plate 3, the rear upper fusion plate 4 and the rear lower fusion plate 5 of the L-shaped are mutually buckled to form a propulsion cavity in the middle part, the connecting rod 7 consists of an upper connecting rod, a lower connecting rod, a front connecting rod and a rear connecting rod, the left end of the front lower fusion plate 1 is provided with the left traction plate 2, the left traction plate is perpendicular to the front lower fusion plate 1, a traction screw hole 8 is formed in the middle of the left traction plate, a strip-shaped hole 10 is formed in the middle of the propulsion block 6, an implant holder is arranged in the strip-shaped hole 10, the implant holder stretches into the strip-shaped hole 10 to be connected with the traction screw hole 8 in the left traction plate 2, the propulsion block 6 is pushed by the implant holder to push the propulsion block 6 into a propulsion cavity to realize four-way expansion among 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, and the advantages of restoring the height and the tension of a vertebral joint, realizing decompression, restoring physiological curvature of the vertebra, bone fusion of the vertebral fusion device, guaranteeing the stability of the vertebral column and the like by utilizing the expansion force of the intervertebral fusion device are achieved.
Claims (10)
1. The expandable interbody fusion cage is characterized by comprising a front lower fusion plate, a left traction plate, a front upper fusion plate, a rear lower fusion plate, a pushing 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 front lower fusion plate, the front upper fusion plate, the rear upper fusion plate and the rear lower fusion plate are mutually buckled to form a pushing cavity in the middle, the connecting rod consists of an upper connecting rod, a lower connecting rod, a front connecting rod and a rear connecting rod, the left end of the front lower fusion plate is provided with the left traction plate, the left traction plate is mutually perpendicular to the front lower fusion plate and is provided with a traction screw hole in the middle, the traction screw hole is mutually communicated with the pushing cavity, the front side surface of the front lower fusion plate and the front side surface of the front upper fusion plate are respectively correspondingly provided with a hinge shaft, the hinge shaft between the front lower fusion plate and the front upper fusion plate is provided with a front connecting rod which enables the front lower fusion plate and the front upper fusion plate to prop up a certain distance and is hinged with the hinge shaft, the upper side surface of the front upper fusion plate and the upper side surface of the rear upper fusion plate are respectively and correspondingly provided with the hinge shaft, the hinge shaft between the front upper fusion plate and the rear upper fusion plate is provided with an upper connecting rod which enables the front upper fusion plate and the rear upper fusion plate to prop up a certain distance and is hinged with the hinge shaft, the rear side surface of the rear upper fusion plate and the rear side surface of the rear lower fusion plate are respectively and correspondingly provided with the hinge shaft, the hinge shaft between the rear upper fusion plate and the rear lower fusion plate is provided with a rear connecting rod which enables the rear upper fusion plate and the rear lower fusion plate to prop up a certain distance and is hinged with the hinge shaft, the lower side surface of the rear lower fusion plate and the lower side surface of the front lower fusion plate are respectively and correspondingly provided with the hinge shaft, the front connecting rod, the upper connecting rod, the rear connecting rod and the lower connecting rod are respectively inclined to be connected with the front lower fusion plate, the front upper fusion plate, the rear upper fusion plate and the rear lower fusion plate in a mutually staggered manner so that the front lower fusion plate, the front upper fusion plate, the rear upper fusion plate and the rear lower fusion plate are in a clasping state, a propelling block is arranged in a propelling cavity formed in the middle of the front lower fusion plate, the front upper fusion plate, the rear upper fusion plate and the rear lower fusion plate after being mutually buckled, a bar hole is formed in the middle of the propelling block, an implant holder for driving the propelling block to propel is arranged in the bar hole, the implant holder stretches into the pulling screw hole in the left pulling plate to be connected, and the propelling block is pushed into the propelling cavity through the implant holder to achieve four-way opening between the front lower fusion plate, the front upper fusion plate, the rear upper fusion plate and the rear lower fusion plate.
2. The expandable interbody fusion cage according to claim 1, wherein the implant holder comprises a handle, a pulling rod, a pushing rod and a pushing knob, the pushing rod is tubular, the right end of the handle is connected with the pulling rod, the left end of the pulling rod is provided with a pulling thread matched with the left pulling block, the right end of the pulling rod is provided with the pushing thread, the pushing knob is sleeved outside the pushing thread, the pushing knob is connected with the pulling rod through threads, the left end of the pushing knob is connected with the pushing rod sleeved outside the pulling rod, and the distance between the left pulling plate and the pushing block is realized by rotating the pushing knob to reduce the distance between the left end of the pushing rod and the left end of the pulling rod.
3. An expandable interbody fusion cage according to claim 2, wherein the diameter of the pusher rod is greater than the diameter of the rod-shaped aperture of the pusher block, such that the pusher rod abuts against the sides of the pusher block for advancement.
4. The expandable interbody fusion cage according to claim 1, wherein 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, the rear side and the lower side of the rear lower fusion plate are 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 are respectively provided with avoidance grooves, the avoidance grooves are formed into V shapes, and adjacent V-shaped grooves are arranged in a central symmetry manner, so that the inclined front connecting rod, the upper connecting rod, the rear connecting rod and the lower connecting rod are clamped in the spliced V-shaped grooves.
5. The expandable interbody fusion cage according to claim 1, wherein the front link, the upper link, the rear link and the lower link are respectively provided with a connecting hole at both ends, the hinge shaft is hollow, and the extended hinge shaft is extruded after passing through the connecting holes, so that the straight hinge shaft is extruded to be in a state of being attached to the inclined chamfer of the link, thereby realizing the anti-falling.
6. The expandable interbody fusion cage according to claim 1, wherein 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 clamping groove which is communicated with each other, the right end of the rear side surface of the pushing block is provided with a clamping projection matched with the clamping groove, and the expanded interbody fusion cage is connected with the pushing block stably through the matched connection of the clamping groove and the clamping projection.
7. The expandable interbody fusion cage according to 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 in a clasping state, wherein the right end of the front upper fusion plate extends out of the right end of the front lower fusion plate to enable the front connecting rod to incline towards the right direction, the right end of the rear upper fusion plate extends out of the right end of the front upper fusion plate to enable the upper connecting rod to incline towards the rear right direction, the right end of the rear lower fusion plate is arranged between the right end of the front lower fusion plate and the right end of the rear upper fusion plate to enable the rear connecting rod to incline towards the right direction, and the lower connecting rod is inclined towards the rear right direction, so that the front connecting rod, the upper connecting rod, the rear connecting rod and the lower connecting rod are rotated to be perpendicular to the front lower fusion plate, the front upper fusion plate, the rear upper fusion plate and the rear lower fusion plate through the expanding action of the pushing block.
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 zigzag bosses, so as 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 slipping.
9. The expandable intervertebral fusion device of claim 1 wherein the pusher block has plant holes for bone fusion material to enter to facilitate fusion of the fusion device with intervertebral bone.
10. The expandable interbody fusion cage of claim 6, wherein the engagement recess and engagement projection are configured as a chamfer or an arcuate projection, respectively.
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| CN111529145B (en) * | 2020-05-27 | 2024-09-27 | 航天中心医院 | Vertebra fusion device system |
| CN114271998A (en) * | 2021-12-13 | 2022-04-05 | 天津市天津医院 | Distractable intervertebral fusion device |
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| CN107224341A (en) * | 2017-07-17 | 2017-10-03 | 博能华医疗器械（北京）有限公司 | One kind can bracing type Invasive lumbar fusion device |
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