CN112137774B - Intervertebral fusion device capable of achieving high matching of pressurized bone grafting and intervertebral space - Google Patents
Intervertebral fusion device capable of achieving high matching of pressurized bone grafting and intervertebral space Download PDFInfo
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- CN112137774B CN112137774B CN202010903650.2A CN202010903650A CN112137774B CN 112137774 B CN112137774 B CN 112137774B CN 202010903650 A CN202010903650 A CN 202010903650A CN 112137774 B CN112137774 B CN 112137774B
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- frame
- intervertebral
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- cage
- fusion cage
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
- A61F2/30—Joints
- A61F2/44—Joints for the spine, e.g. vertebrae, spinal discs
- A61F2/4455—Joints for the spine, e.g. vertebrae, spinal discs for the fusion of spinal bodies, e.g. intervertebral fusion of adjacent spinal bodies, e.g. fusion cages
Abstract
The invention discloses an interbody fusion cage capable of matching the height of a bone graft and an intervertebral space under pressure, which comprises a frame, wherein the frame is in a rectangular shape with through upper and lower parts, a power slider is connected in an embedded manner inside the frame, support plates are respectively arranged at the upper end and the lower end of the power slider, ribs are arranged on the support plates, grooves are arranged on the power slider, the support plates and the power slider are connected in an embedded manner through the ribs and the grooves, a rear through hole is arranged at the rear end of the frame, a screw rod is connected with the rear end of the power slider through threads, the screw rod penetrates through the rear through hole and is sleeved on the frame, grooves are also arranged in the circumferential direction of the screw rod, the grooves are matched with a fixed shaft pin to prevent the screw rod from moving in the axial direction, a front through hole is arranged at the front end of the frame, a guide pin pipe is assembled and connected with the front end of the power slider in a sliding manner, and the guide pin pipe is connected to the front end of the frame through threads The perfect matching of the height of the fusion cage and the height of the physiological intervertebral space is realized by the linkage control of the screw and the power slide block; the purpose of parallel height lifting of the intervertebral space after implantation is realized.
Description
Technical Field
The invention relates to the technical field of fusion cage, in particular to an intervertebral fusion cage which can be used for pressurizing bone grafting and highly matching intervertebral space.
Background
The traditional interbody fusion cage does not have the height adjusting function, and interbody fusion cages with different specifications are required to be applied in different intervertebral space heights, so that the types are complex, the operation difficulty is increased, the operation time is long, and the operation process is complicated;
the existing intervertebral fusion operation is suitable for open operation due to overlarge volume of an intervertebral fusion device, the larger-volume fusion device damages the original stable structures such as articular process, intervertebral disc fibrous ring and the like too much to cause unstable spine, and a nail rod must be added for fixation after the operation, so that the operation difficulty is increased, the operation time is prolonged, the operation cost is increased, and the probability of damage to nerve roots is also higher.
The shape and structure of various intervertebral fusion implants limits their functionality.
The mainstream bullet head type fusion cage is hollow except for the front and back end surfaces. The advantages of the fusion cage are as follows: the hollow design of the inside and the outside is easy to implant bones, so that the stability of the lumbar vertebra is better established and maintained after the fusion cage is implanted. The disadvantages of this type of fusion cage are: the height of the fusion cage is fixed, the fusion cage cannot adapt to different segment intervertebral space heights, and the application range is relatively narrow. The intervertebral fusion cage with different specifications is required to be applied to different intervertebral space heights, the types are complex, the operation difficulty is increased, longer operation time is required, and the operation process is complicated.
Another type of expandable intervertebral cage is characterized in that: the cage can realize the parallel expansion function of the cage main body, can also cushion the height or the area, and can adapt to the height or the area of different segment intervertebral spaces in a certain range. Disadvantages of this type of inflatable cage are: although this kind of fusion cage main part is adaptable different section intervertebral space height or area, it is limited to strut the high scope, and the volume is generally great, more generally is applicable to open operation, and great volume fusion cage destroys too much and causes the backbone unstability to original stable structure such as articular process and intervertebral disc fibre ring, and the postoperative must add the nail stick and fix, not only increases the operation degree of difficulty, prolongs operation time, increases the operation expense, and the probability to the nerve root damage is also great simultaneously.
In summary, the current intervertebral fusion cage and fusion technology need to be further improved.
Disclosure of Invention
Aiming at the problems, the invention provides an intervertebral fusion cage capable of realizing high matching of a pressurized bone graft and an intervertebral space, which mainly solves the problems in the background technology.
The invention provides an intervertebral fusion cage capable of realizing high matching of a pressurized bone graft and an intervertebral space, which comprises a frame, the frame is in a rectangular shape with through upper and lower parts, the power slide block is connected in the frame in an embedded manner, the upper end and the lower end of the power slide block are respectively provided with a support plate, the supporting plate is provided with ribs, the power sliding block is provided with grooves, the supporting plate and the power sliding block are connected in a nesting way through the ribs and the grooves, the rear end of the frame is provided with a rear through hole, the rear end of the power slide block is connected with a screw rod through threads, the screw rod penetrates through the rear through hole and is sleeved on the frame, a groove is arranged in the circumferential direction of the screw rod, the groove is matched with the fixed shaft pin to prevent the screw rod from moving in the axial direction, the front end of the frame is provided with a front through hole, the front end of the power sliding block is connected with a guide pin pipe in a sliding assembly mode, and the guide pin pipe is connected to the front end of the frame through threads.
In a further improvement, the ribs on the support plate are nested between the frame and the power slide.
The improved fusion cage is characterized in that ribs perpendicular to the axial direction of the fusion cage are arranged on two outer sides of the supporting plate and used for limiting the movement of the supporting plate along the axial direction of the frame.
The further improvement is that ribs which can slide with the grooves on the power slide block are arranged on the supporting plate, so that the supporting plate can climb or descend along the grooves on the power slide block.
The further improvement is that the guide pin tube is in threaded connection with the front through hole of the frame.
The further improvement is that the guide pin pipe is two segments with different diameters and is used for limiting the motion range of the power slide block.
The improvement is that two sides of the guide pin pipe are provided with positioning screws.
The improved structure is characterized in that threads are arranged at two ends of the screw rod, a step is arranged between the threads at the two ends, and the step is supported on the rear through hole of the frame.
The further improvement is that the guide pin pipe and the screw rod are both hollow and communicated.
The further improvement is that the tail part of the screw rod is provided with a triangular tangential groove matched with the fusion device implantation tool.
The improved intervertebral fusion cage is further improved in that an included angle is formed between the upper supporting plate and the lower supporting plate, the included angle is 8.8-10 degrees, and reverse teeth are arranged at the middle section of the outer surface of each supporting plate, so that the pressure bone grafting part on the same supporting plate is surrounded by the front and back reverse teeth, and under the action of intervertebral pressure, the reverse teeth arranged on the upper supporting plate and the lower supporting plate can enable the fusion cage to maintain the position of the fusion cage in the intervertebral space after the fusion cage is lifted.
The improved structure is characterized in that a bulge is arranged on the rear section of the supporting plate, the bulge is arched, and the bulge plays roles in fixing and preventing collapse.
Compared with the prior art, the invention has the beneficial effects that:
1. as the support plate and the power slide block of the fusion cage are hollow, more space can be reserved for introducing bone graft or similar bone growth inducing materials in and around the fusion cage, and the intervertebral fusion is further promoted in the fusion cage. The cage is preferably filled with bone graft or similar bone growth inducing material, promoting the growth of bone tissue. Such bone tissue may optionally be substantially filled between the endplates of the adjacent vertebral bodies before, after, or during implantation of the cage.
2. When the fusion cage is implanted, the fusion cage is in a contracted state and has a smaller diameter. The small diameter of the fusion device facilitates the safe entering of the intervertebral space through the existing spinal endoscope channel, and the implantation of the minimally invasive surgery is easy to complete. Meanwhile, the small diameter of the fusion cage is beneficial to being suitable for more spinal segments, and the application range of the fusion cage is enlarged.
3. The supporting surface of the fusion cage is wide, so that when the fusion cage is parallelly propped open in the intervertebral space, the loads of the contact surfaces of the fusion cage and the upper and lower end plates can be uniformly distributed, and the intervertebral space is forcedly propped open without using special tools and special body positions. Meanwhile, the implantation process of the fusion cage does not cause additional damage or cutting to the upper and lower endplates.
4. When the fusion cage is in a distraction state in the intervertebral space, the outer surface of the supporting plate of the fusion cage is tightly jointed with the contact surfaces of the upper and lower end plates and the intervertebral space by the design of parallel distraction and the anti-skidding teeth of the supporting surface, and the jointing surface is smoother;
5. because the fusion cage enters through the existing spinal endoscope channel, the intervertebral space does not need to be expanded when entering, and the traction injury to peripheral important tissues (such as blood vessels, nerves, muscles and the like) in the expanding process can be avoided;
6. the overall structure design of the fusion cage can promote early fusion and allow the fusion cage to be expanded and then be supplemented with pressurized bone grafting;
7. one end of the supporting plate of the fusion cage is bulged to be arched, so that the angle of the intervertebral space is matched and the collapse is effectively prevented;
8. the under-lens fusion technology using the fusion device is matched with the spine endoscope and the minimally invasive technology which are rapidly developed at present, fusion operation approaches in different directions including OLIF, ATP, XLIF, LLIF, PLIF, TLIF, ALIF and the like can be realized more safely, and safe minimally invasive fusion is really realized.
Drawings
The drawings are for illustrative purposes only and are not to be construed as limiting the patent; for the purpose of better illustrating the embodiments, certain features of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
FIG. 1 is an exploded view of the overall structure of an embodiment of the present invention;
FIG. 2 is a schematic diagram of a closed state structure according to an embodiment of the present invention;
FIG. 3 is a schematic structural view of an expanded state according to an embodiment of the present invention;
FIG. 4 is an overall cross-sectional structural view of an embodiment of the present invention;
FIG. 5 is a schematic view of a supporting plate according to an embodiment of the present invention;
FIG. 6 is a schematic structural view of a power slider according to an embodiment of the present invention;
FIG. 7 is a block diagram of an embodiment of the present invention;
FIG. 8 is a schematic view of a screw structure according to an embodiment of the present invention;
FIG. 9 is a schematic view of a guide pin tube configuration according to an embodiment of the present invention;
FIG. 10 is a schematic view of a kingpin configuration according to an embodiment of the present invention;
FIG. 11 is an exploded view of another embodiment of the present invention;
FIG. 12 is a schematic view of a supporting plate according to an embodiment of the present invention;
FIG. 13 is a schematic view of a support plate according to another embodiment of the present invention;
wherein: 1. a set screw; 2. a guide pin tube; 3. framing; 4. a support plate; 5. a screw; 6. a snap ring; 7. a power slider; 8. and (4) fixing the shaft pin.
Detailed Description
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted" and "connected" are to be interpreted broadly, e.g., as being either fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, so to speak, as communicating between the two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art. The technical solution of the present invention is further described below with reference to the accompanying drawings and examples.
The height-adjustable structural design of the interbody fusion cage can be understood, the parallel climbing or descending of the fusion cage supporting plate 4 is realized through the linkage control of the guide pin tube 2, the screw rod 5 and the power slider 7, meanwhile, the height-adjustable range is large (the opening height can be adjusted through the thread design), the fusion cage with different heights is replaced, and the perfect matching of the height of the fusion cage and the height of the physiological intervertebral space is realized; the upper and lower gaps are highly parallel after implantation.
Referring to fig. 1-9, an intervertebral fusion cage capable of realizing height matching between a pressurized bone graft and an intervertebral space comprises a frame 3, wherein the frame 3 is in a rectangular shape which is through from top to bottom, a power slider 7 is connected in the frame 3 in an embedded manner, support plates 4 are respectively arranged at the upper end and the lower end of the power slider 7, ribs are arranged on the support plates 4, grooves are arranged on the power slider 7, the support plates 4 and the power slider 7 are connected in an embedded manner through the ribs and the grooves, a rear through hole is arranged at the rear end of the frame 3, a screw 5 is connected at the rear end of the power slider 7 through a thread, the screw 5 penetrates through the rear through hole and is sleeved on the frame 3, a groove is also arranged in the circumferential direction of the screw 5, the groove is matched with a fixed axis pin to ensure that the screw 5 cannot move in the axial direction, a front through hole is arranged at the front end of the frame 3, a guide pin pipe 2 is connected at the front end of the power slider 7 in a sliding assembly manner, the guide pin pipe 2 is connected to the front end of the frame 3 through threads.
Specifically, the screw rod 5 can be limited on the rear through hole of the frame 3 through a snap ring 6, so that the screw rod 5 and the frame 3 can rotate mutually and cannot move axially.
As a preferred embodiment of the present invention, the ribs on the supporting plate 4 are nested between the frame 3 and the power slider 7, so that the deformation of the ribs on the supporting plate 4 is limited when the force is applied, thereby enhancing the stability of the fusion cage in the working state.
In a preferred embodiment of the present invention, the supporting plate 4 is provided with ribs perpendicular to the axial direction of the fusion cage on both outer sides thereof, and the ribs are engaged with the grooves of the frame 3 to restrict the movement of the supporting plate 4 along the axial direction of the frame 3.
In a preferred embodiment of the present invention, the supporting plate 4 is provided with ribs capable of sliding with the grooves on the power slider 7, so that the supporting plate 4 ascends or descends along the grooves on the power slider 7.
Specifically, in the closed state of the fusion cage, by rotating the screw rod 5, the power slider 7 will be away from the screw rod 5 along the thread axis direction, while the support plate 4 can only be raised or lowered along the power slider 7 under the mutual restriction of the ribs and the grooves.
Referring to fig. 12, preferably, the upper and lower support plates 4 are designed to form a plane with an included angle of 8.8 degrees so as to be highly matched with the intervertebral space, and meanwhile, the middle section of each support plate is provided with a reverse tooth higher than the surrounding surface, so that the pressure bone grafting part on the same support plate is surrounded by the teeth which are reversed back and forth, and under the effect of intervertebral pressure, the reverse teeth arranged on the upper and lower support plates can enable the fusion cage to maintain the position of the fusion cage in the intervertebral space after the fusion cage is lifted.
Referring to fig. 11, preferably, the rear end of the supporting plate is provided with a protrusion, and the protrusion is arched and can play a role in fixing and preventing collapse.
Specifically, the arch-shaped bulge has the technical effects that 1, the included angle is formed by aid of design, the included angle ranges from 8.8 degrees to 10 degrees so as to be highly matched with the angle of an intervertebral space, and 2, the arch-shaped bulge plays a role in fixing and preventing collapse.
As a preferred embodiment of the present invention, the guide pin tube 2 is in threaded connection with the front through hole of the frame 3, and can guide the movement of the power slider 7 along the axis of the fusion cage.
As a preferred embodiment of the present invention, the guide pin tube 2 is formed in two segments with different diameters, which is used to limit the range of motion of the power slider 7.
As a preferred embodiment of the present invention, the guide pin tube 2 is provided with a set screw 1 at both sides thereof, and the set screw 1 also plays a role of limiting the movement of the power slider 7.
Preferably, the guide pin tube comprises a guide pin and a positioning tube, and can also play a role in limiting the power slider 7, so as to limit the lifting height of the support plate.
As a preferred embodiment of the present invention, two ends of the screw rod 5 are provided with threads, and a step is disposed between the threads of the two ends, and the step is supported on the rear through hole of the frame 3.
Specifically, the both ends of screw rod 5 are provided with the screw thread, are provided with a step between the screw thread of both ends, the step top is in on the back through-hole of frame 3, because the auto-lock characteristic of screw thread to because the existence of snap ring 6, screw rod 5 only can with frame 3 rotation each other and unable axial displacement, when fusing the ware and being in the state of strutting, the load is applyed when in backup pad 4, rotate screw rod 5, power slider 7 can be close to gradually under the effect of screw thread step between the screw rod 5 both ends screw thread, and the cooperation rib realizes initiatively dropping backup pad 4.
As a preferred embodiment of the invention, the guide pin tube 2 and the screw rod 5 are both hollow and communicated to form a hollow channel which is used as a passage for threading a guide wire or injecting bone cement and the like, and the fusion cage is axially communicated integrally, so that the guide wire can be conveniently threaded or other operations needing an axial hole in the operation process.
As a preferred embodiment of the present invention, the tail of the screw rod 5 is provided with a triangular tangential groove adapted to the fusion cage implantation tool, and the length of the screw rod 5 is limited, so that when the fusion cage is in the expanded state, the interior of the power slide block 7 is kept hollow and penetrated, which is beneficial to filling autogenous bone inside and is beneficial to spinal fusion.
In the drawings, the positional relationship is described for illustrative purposes only and is not to be construed as limiting the present patent; it should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (9)
1. The interbody fusion cage capable of realizing the height matching between the bone grafting and the intervertebral space under pressurization is characterized by comprising a frame (3), wherein the frame (3) is in a rectangular shape which is through from top to bottom, a power slider (7) is connected in the frame (3) in a nested manner, supporting plates (4) are respectively arranged at the upper end and the lower end of the power slider (7), ribs are arranged on the supporting plates (4), grooves are arranged on the power slider (7), the supporting plates (4) and the power slider (7) are connected in a nested manner through the ribs and the grooves, a rear through hole is arranged at the rear end of the frame (3), the rear end of the power slider (7) is connected with a screw rod (5) through threads, the screw rod (5) penetrates through the rear through hole and is sleeved on the frame (3), the grooves are also arranged in the circumferential direction of the screw rod (5), and the grooves are matched with a shaft fixing pin to realize that the screw rod (5) cannot move in the axial direction, the front end of the frame (3) is provided with a front through hole, the front end of the power sliding block (7) is connected with a guide pin pipe (2) in a sliding assembly mode, and the guide pin pipe (2) is connected to the front end of the frame (3) through threads;
ribs on the supporting plate (4) are nested and installed between the frame (3) and the power sliding block (7);
ribs perpendicular to the axial direction of the fusion cage are arranged on two outer sides of the supporting plate (4) and used for limiting the supporting plate (4) from moving along the axial direction of the frame (3);
ribs which can slide with the grooves on the power sliding block (7) are arranged on the supporting plate (4), so that the supporting plate (4) can climb or descend along the grooves on the power sliding block (7);
the power sliding block (7) is hollow and penetrated, so that autogenous sclerotin can be filled in the power sliding block, and spinal fusion can be facilitated.
2. An intervertebral cage according to claim 1, characterised in that the guide pin tubes (2) are screwed into the front through hole of the frame (3).
3. An intervertebral cage according to claim 1, characterised in that the guide pin tube (2) is in two segments of unequal diameter, limiting the range of motion of the power slide (7).
4. An intervertebral cage according to claim 1, characterised in that the guide pin tubes (2) are fitted on both sides with set screws (1), the set screws (1) being used to limit the movement of the power slide (7) in the direction of the cage axis.
5. The intervertebral fusion cage with the height-matched intervertebral space for bone grafting and bone grafting under pressure as claimed in claim 1, is characterized in that the screw rod (5) is provided with threads at both ends, a step is arranged between the threads at both ends, and the step is supported on the rear through hole of the frame (3).
6. The intervertebral cage for the height-matching of the intervertebral space for the bone grafting under pressure according to claim 1, characterized in that the guide pin tube (2) and the screw (5) are hollow and pass through.
7. An intervertebral cage according to claim 1, characterised in that the tail of the screw (5) is provided with a trigonometric groove adapted to the cage implantation tool.
8. The interbody fusion cage capable of realizing the height matching between the pressurized bone graft and the intervertebral space according to claim 1, wherein an included angle is formed between the upper support plate and the lower support plate (4), the included angle is 8.8-10 degrees, and the middle section of the outer surface of each support plate (4) is provided with reverse teeth, so that the pressurized bone graft part on the same support plate is surrounded by the front and back reverse teeth, and the fusion cage can maintain the position of the fusion cage in the intervertebral space after the fusion cage is lifted under the action of the intervertebral pressure by the reverse teeth arranged on the upper support plate and the lower support plate.
9. The intervertebral fusion device for the pressurized bone grafting and the height matching of the intervertebral space as claimed in claim 8, characterized in that the back section of the supporting plate (4) is provided with a bulge, the bulge is in an arch shape, and the bulge plays the roles of fixing and collapse prevention.
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| CN202010903650.2A CN112137774B (en) | 2020-09-01 | 2020-09-01 | Intervertebral fusion device capable of achieving high matching of pressurized bone grafting and intervertebral space |
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| CN202010903650.2A CN112137774B (en) | 2020-09-01 | 2020-09-01 | Intervertebral fusion device capable of achieving high matching of pressurized bone grafting and intervertebral space |
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| CN115969585B (en) * | 2023-01-10 | 2023-08-22 | 北京纳通医疗科技控股有限公司 | Bidirectional expandable fusion device |
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