CN112120836A - Height-adjustable high-stability intervertebral fusion device capable of supplementing and pressurizing bone grafting - Google Patents
Height-adjustable high-stability intervertebral fusion device capable of supplementing and pressurizing bone grafting Download PDFInfo
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- CN112120836A CN112120836A CN202010902458.1A CN202010902458A CN112120836A CN 112120836 A CN112120836 A CN 112120836A CN 202010902458 A CN202010902458 A CN 202010902458A CN 112120836 A CN112120836 A CN 112120836A
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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 a high-stability intervertebral fusion device with adjustable height and capable of supplementing pressurized bone grafting, which comprises a middle frame, wherein the rear end of the middle frame is provided with a through hole, the left side and the right side of the rear end of the middle frame, which correspond to the through hole, are respectively provided with a groove, a screw rod penetrates through the through hole, the screw rod is axially limited on the through hole through the positioning piece, one end of the screw rod penetrating into the inner side of the middle frame is connected with a sliding block, the upper end and the lower end of the sliding block are respectively provided with a supporting plate, the supporting plates realize climbing or descending through the nesting and matching of ribs, a guide groove and a chute, the left side and the right side of the front end of the middle frame are respectively provided with a threaded hole, a limiting pin is arranged on the threaded hole, and the front end of the middle frame is communicated with a wire guide hole corresponding to the position of the screw rod in the axial direction, the perfect matching of the height of the fusion cage and the height of the physiological intervertebral space is realized through the linkage control of the guide pin, 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 cages, in particular to a high-stability intervertebral fusion cage with adjustable height and capable of supplementing pressurized bone grafting.
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 a high-stability intervertebral fusion device with adjustable height and capable of supplementing pressurized bone grafting, which mainly solves the problems in the background technology.
The invention provides a high-stability intervertebral fusion device with adjustable height and capable of supplementing and pressurizing bone grafting, which comprises a middle frame, a screw rod, a slide block and a limiting pin, wherein the rear end of the middle frame is provided with a through hole, the rear end of the middle frame is respectively provided with a groove corresponding to the left side and the right side of the through hole, the screw rod is arranged in the through hole in a penetrating way, the screw rod is provided with a circumferential groove perpendicular to the axis of the screw rod, the screw rod is axially limited on the through hole through a positioning piece, one end of the screw rod penetrating into the inner side of the middle frame is connected with the slide block, the slide block is connected with the screw rod through threads, the upper end and the lower end of the slide block are respectively provided with a support plate, the inner side of the middle frame is provided with guide grooves crossed in a splayed shape, two opposite sides of the slide block and, the utility model discloses a screw rod, including screw rod, backup pad, spacer pin, screw rod, guide slot, chute, the backup pad passes through the nested cooperation between rib and guide slot, the chute and realizes lifting or decline, be provided with the screw hole on the left and right sides of the front end of center respectively, be provided with on the screw hole the spacer pin, the front end of center corresponds screw rod axis direction ascending position is link up there is the guide wire hole.
The improved structure is characterized in that two sections of threads are axially distributed on the screw rod, and the circumferential groove is formed between the two sections of threads.
The improved structure is characterized in that the screw is also provided with a cylindrical step which is supported on the through hole at the rear end of the middle frame.
The improved structure is characterized in that the positioning piece comprises a positioning pin, threaded holes are formed in the bottoms of grooves in the left side and the right side of the rear end of the middle frame, the positioning pin penetrates into the circumferential grooves of the screw rod through the threaded holes, and the screw rod is axially positioned on the middle frame.
The improved structure is characterized in that the positioning piece comprises a clamping ring, an inner ring of the clamping ring is clamped in a circumferential groove of the screw rod, an outer ring of the clamping ring is propped against a through hole in the rear end of the middle frame, and the screw rod is axially positioned on the middle frame.
The further improvement is that two rectangular windows are formed in the surface of the supporting plate, and the rectangular windows are used for pressure bone grafting before the fusion cage is implanted.
The further improvement is that the axis of the screw is provided with a through hole.
The further improvement lies in that the spacer pin includes 2, the screw hole of establishing into the center front end is worn to establish respectively with the slope upwards with the downward direction of slope by the spacer pin, the backup pad corresponds the position of spacer pin has seted up open recess, open recess with the spacer pin is mutually supported and is prevented the backup pad breaks away from the center in the lifting process.
The improved structure is characterized in that a triangular tangential groove matched with a fusion device implantation tool is formed in the tail part of one end, outside the middle frame, of the screw rod, and the thread spiral line of one end, outside the middle frame, of the screw rod is opposite to the rotation direction of the screw rod when the supporting plate is lifted.
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. because the upper and lower supporting plates of the fusion cage are provided with the opening parts, the limiting hollow block is hollow and is provided with the through hole, more space can be reserved for introducing bone graft or similar bone growth inducing materials into 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 fusion appliance has a height adjusting function, and the ratio of the height capable of being stretched is 1: 1.7, therefore, the intervertebral disc is suitable for different intervertebral heights, the cost is reduced, and the operation process is simplified.
9. 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 a schematic view of a partial cutaway structure of an embodiment of the present invention;
FIG. 5 is a schematic view of a partial cutaway structure of an embodiment of the present invention;
FIG. 6 is a schematic view of a partial cutaway structure of an embodiment of the present invention;
FIG. 7 is a diagram illustrating a middle frame structure according to an embodiment of the present invention;
FIG. 8 is a schematic view of a supporting plate according to an embodiment of the present invention;
FIG. 9 is a schematic view of a slider structure according to an embodiment of the present invention;
FIG. 10 is a schematic view of a screw structure according to an embodiment of the present invention;
FIG. 11 is a schematic view of a spacing pin according to an embodiment of the present invention;
FIG. 12 is a schematic view of a locating pin according to an embodiment of the present invention;
FIG. 13 is an exploded view of another embodiment of the present invention;
FIG. 14 is a schematic structural view of a closed state according to another embodiment of the present invention;
FIG. 15 is a schematic structural view of a distracted state according to another embodiment of the present invention;
FIG. 16 is a schematic view in partial cross-section of another embodiment of the present invention;
FIG. 17 is a schematic view in partial cutaway of another embodiment of the present invention;
FIG. 18 is a schematic view in partial cross-section of another embodiment of the present invention;
FIG. 19 is a diagram illustrating a middle frame structure according to another embodiment of the present invention;
FIG. 20 is a schematic view of a supporting plate according to an embodiment of the present invention;
FIG. 21 is a schematic view of a support plate according to another embodiment of the present invention;
wherein: 1. a middle frame; 2. a snap ring; 3. positioning pins; 4. a support plate; 5. a slider; 6. a screw; 7. and a limiting 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, the screw 6 and the power slider 5, meanwhile, the range of the adjustable height is large (the stretching height is adjustable 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 purpose of parallel height lifting of the intervertebral space after implantation is realized.
Example 1:
referring to fig. 1-12, a height-adjustable high-stability intervertebral fusion cage capable of supplementing and pressurizing bone grafting comprises a middle frame 1, a screw rod 6, a sliding block 5 and a limiting pin 7, wherein the rear end of the middle frame 1 is provided with a through hole, the rear end of the middle frame 1 is provided with grooves corresponding to the left side and the right side of the through hole respectively, the screw rod 6 is arranged in the through hole in a penetrating manner, the screw rod 6 is provided with a circumferential groove perpendicular to the axis of the screw rod 6, the screw rod 6 is axially limited on the through hole through a positioning piece, one end of the screw rod 6 penetrating into the inner side of the middle frame 1 is connected with the sliding block 5, the sliding block 5 is connected with the screw rod 6 through threads, the upper end and the lower end of the sliding block 5 are respectively provided with a support plate 4, the inner side of the middle frame 1 is provided with guide grooves crossed in a splayed manner, and, be provided with the rib on the both sides of backup pad 4, backup pad 4 realizes lifting or decline through the nested cooperation between rib and guide slot, the chute, be provided with the screw hole on the left and right sides of the front end of center 1 respectively, be provided with on the screw hole spacer pin 7, the front end of center 1 corresponds 6 ascending positions of axis direction of screw rod are link up there is the yarn guide hole.
Specifically, the upper and lower support plates 4 surround the sliding block 5, and the sliding block 5 can be limited to rotate around the axis of the middle frame 1, so that when the screw rod 6 is rotated, axial movement of the screw rod 6 is limited, and only axial movement of the sliding block 5 close to or far away from the end of the triangular tangential groove of the screw rod 6 can occur, and the support plates 4 also perform corresponding lifting or lowering movement under the limitation of ribs, guide grooves and inclined grooves, so that the fusion cage is closed and unfolded.
Referring to fig. 20, 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 the support plates is provided with reverse teeth higher than the peripheral 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. 21, preferably, the rear end of the supporting plate 4 is provided with a protrusion, which 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.
Specifically, two sections of threads are axially distributed on the screw rod 6, and the circumferential groove is arranged between the two sections of threads.
Specifically, still be provided with the cylinder step on the screw rod 6, the cylinder step top is in on the through-hole of center 1 rear end, when the cylinder step was used for the fusion ware to strut, the self-locking effect of cooperation screw thread reached the effect that the fusion ware height kept.
Specifically, the setting element includes locating pin 3, recess bottom on the 1 rear end left and right sides of center is provided with the screw hole, locating pin 3 wears to establish through the screw hole in the circumference recess of screw rod 6, realize screw rod 6 is in axial positioning on the center 1.
Specifically, two rectangular windows are formed in the surface of the supporting plate 4 and used for pressurizing bone grafting before the fusion cage is implanted, and after the fusion cage is implanted into an intervertebral space, the growth of the bone penetrating fusion cage is facilitated, and the fusion effect is improved.
Moreover, the rear end of the supporting plate 4 is provided with a suspension plate with supporting reinforcement, so that the contact surface of the fusion cage and the vertebral body can be increased.
Specifically, a through hole is formed in the axis of the screw 6, and the screw can be used for threading a guide wire, injecting bone cement and the like.
Specifically, the number of the limit pins 7 is 2, the limit pins 7 penetrate through threaded holes in the front end of the middle frame 1 in the upward inclined direction and the downward inclined direction respectively, open grooves are formed in the positions, corresponding to the limit pins 7, of the support plate 4, and the open grooves are matched with the limit pins 7 to prevent the support plate 4 from being separated from the middle frame 1 in the lifting process. Particularly, the spacing pin 7 can limit the distance between the two support plates 4 when the fusion cage is unfolded, so that the support plates 4 are prevented from being separated from the middle frame 1.
Furthermore, the two supporting parts of the supporting plate 4 are arranged in a mutually staggered and mutually connected mode, so that the spreading distance of the two supporting plates 4 is greatly increased, and the two staggered parts mutually support each other, thereby achieving the effect of strengthening stress.
Specifically, the tail part of one end of the screw rod 6 outside the middle frame 1 is provided with a triangular tangential groove matched with a fusion device implantation tool, and the thread spiral of one end of the screw rod 6 outside the middle frame 1 is opposite to the rotation direction of the screw rod 6 when the supporting plate 4 is lifted, otherwise, the fusion device is possibly separated from the implantation tool.
Example 2:
referring to fig. 8-19, a height-adjustable high-stability intervertebral fusion cage capable of supplementing and pressurizing bone grafting comprises a middle frame 1, a screw rod 6, a sliding block 5 and a limiting pin 7, wherein the rear end of the middle frame 1 is provided with a through hole, the rear end of the middle frame 1 is provided with grooves corresponding to the left side and the right side of the through hole respectively, the screw rod 6 is arranged in the through hole in a penetrating manner, the screw rod 6 is provided with a circumferential groove perpendicular to the axis of the screw rod 6, the screw rod 6 is axially limited on the through hole through a positioning piece, one end of the screw rod 6 penetrating into the inner side of the middle frame 1 is connected with the sliding block 5, the sliding block 5 is connected with the screw rod 6 through threads, the upper end and the lower end of the sliding block 5 are respectively provided with a support plate 4, the inner side of the middle frame 1 is provided with guide grooves crossed in a splayed manner, and, the improved wire guide device is characterized in that ribs are arranged on two sides of the supporting plate 4, the supporting plate 4 can climb or descend through the nesting fit between the ribs and the guide groove and the chute, threaded holes are respectively formed in the left side and the right side of the front end of the middle frame 1, the limiting pins 7 are arranged on the threaded holes, and wire guide holes are formed in the positions, corresponding to the axial direction of the screw rods 6, of the front end of the middle frame 1 in a penetrating mode.
Specifically, the upper and lower support plates 4 surround the sliding block 5, and the sliding block 5 can be limited to rotate around the axis of the middle frame 1, so that when the screw rod 6 is rotated, axial movement of the screw rod 6 is limited, and only axial movement of the sliding block 5 close to or far away from the end of the triangular tangential groove of the screw rod 6 can occur, and the support plates 4 also perform corresponding lifting or lowering movement under the limitation of ribs, guide grooves and inclined grooves, so that the fusion cage is closed and unfolded.
Referring to fig. 20, 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 the support plates is provided with reverse teeth higher than the peripheral 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. 21, preferably, the rear end of the supporting plate 4 is provided with a protrusion, which is arched and can play a role in fixing and preventing collapse.
Specifically, two sections of threads are axially distributed on the screw rod 6, and the circumferential groove is arranged between the two sections of threads.
Specifically, still be provided with the cylinder step on the screw rod 6, the cylinder step top is in on the through-hole of center 1 rear end, when the cylinder step was used for the fusion ware to strut, the self-locking effect of cooperation screw thread reached the effect that the fusion ware height kept.
Specifically, the positioning piece comprises a clamping ring 2, an inner ring of the clamping ring 2 is clamped in a circumferential groove of the screw rod 6, an outer ring of the clamping ring 2 is pressed against a through hole in the rear end of the middle frame 1, and the screw rod 6 is axially positioned on the middle frame 1.
Specifically, two rectangular windows are formed in the surface of the supporting plate 4 and used for pressurizing bone grafting before the fusion cage is implanted, and after the fusion cage is implanted into an intervertebral space, the growth of the bone penetrating fusion cage is facilitated, and the fusion effect is improved.
Moreover, the rear end of the supporting plate 4 is provided with a suspension plate with supporting reinforcement, so that the contact surface of the fusion cage and the vertebral body can be increased.
Specifically, a through hole is formed in the axis of the screw 6, and the screw can be used for threading a guide wire, injecting bone cement and the like.
Specifically, the number of the limit pins 7 is 2, the limit pins 7 penetrate through threaded holes in the front end of the middle frame 1 in the upward inclined direction and the downward inclined direction respectively, open grooves are formed in the positions, corresponding to the limit pins 7, of the support plate 4, and the open grooves are matched with the limit pins 7 to prevent the support plate 4 from being separated from the middle frame 1 in the lifting process. Particularly, the spacing pin 7 can limit the distance between the two support plates 4 when the fusion cage is unfolded, so that the support plates 4 are prevented from being separated from the middle frame 1.
Furthermore, the two supporting parts of the supporting plate 4 are arranged in a mutually staggered and mutually connected mode, so that the spreading distance of the two supporting plates 4 is greatly increased, and the two staggered parts mutually support each other, thereby achieving the effect of strengthening stress.
Specifically, the tail part of one end of the screw rod 6 outside the middle frame 1 is provided with a triangular tangential groove matched with a fusion device implantation tool, and the thread spiral of one end of the screw rod 6 outside the middle frame 1 is opposite to the rotation direction of the screw rod 6 when the supporting plate 4 is lifted, otherwise, the fusion device is possibly separated from the implantation tool.
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 (11)
1. The high-stability interbody fusion cage is characterized by comprising a middle frame (1), a screw rod (6), a sliding block (5) and a limiting pin (7), wherein the rear end of the middle frame (1) is provided with a through hole, the rear end of the middle frame (1) is provided with grooves corresponding to the left side and the right side of the through hole respectively, the screw rod (6) is arranged in the through hole in a penetrating manner, the screw rod (6) is provided with a circumferential groove perpendicular to the axis of the screw rod (6), the screw rod (6) is axially limited on the through hole through a positioning piece, one end of the screw rod (6) penetrating into the inner side of the middle frame (1) is connected with the sliding block (5), the sliding block (5) is in threaded connection with the screw rod (6), the upper end and the lower end of the sliding block (5) are provided with supporting plates (4) respectively, and the inner side of the middle frame (1) is provided with guide grooves crossed in a splayed manner, slider (5) with be provided with the chute on the both sides that the guide slot is in opposite directions, be provided with the rib on the both sides of backup pad (4), backup pad (4) realize the lifting or descend through the nested cooperation between rib and guide slot, the chute, be provided with the screw hole on the left and right sides of the front end of center (1) respectively, be provided with on the screw hole spacer pin (7), the front end of center (1) corresponds screw rod (6) ascending position of axis direction is link up there is the guide wire hole.
2. The intervertebral fusion device with high stability for supplementing and pressurizing bone graft and adjustable height as claimed in claim 1, wherein the screw rod (6) is axially distributed with two sections of threads, and the circumferential groove is arranged between the two sections of threads.
3. The intervertebral fusion device with high stability and adjustable height and capable of supplementing and pressurizing bone grafting as claimed in claim 1, characterized in that the screw rod (6) is further provided with a cylindrical step which is propped against the through hole at the rear end of the middle frame (1).
4. The intervertebral fusion cage with adjustable height and high stability for supplementing and pressurizing bone grafting according to claim 1, wherein the positioning piece comprises a positioning pin (3), the bottoms of the grooves on the left and right sides of the rear end of the middle frame (1) are provided with threaded holes, and the positioning pin (3) penetrates into the circumferential groove of the screw rod (6) through the threaded holes to realize the axial positioning of the screw rod (6) on the middle frame (1).
5. The intervertebral fusion cage with adjustable height and high stability for supplementing and pressurizing bone grafting according to claim 1, wherein the positioning element comprises a snap ring (2), the inner ring of the snap ring (2) is clamped in the circumferential groove of the screw (6), the outer ring of the snap ring (2) is propped against the through hole at the rear end of the middle frame (1), and the axial positioning of the screw (6) on the middle frame (1) is realized.
6. The intervertebral fusion device with high stability and adjustable height and capable of supplementing the compression bone graft is characterized in that the surface of the supporting plate (4) is provided with two rectangular windows, and the rectangular windows are used for the compression bone graft before the fusion device is implanted.
7. The intervertebral fusion device with high stability for supplementing and pressurizing bone graft and adjustable height as claimed in claim 1, wherein the axial center of the screw rod (6) is provided with a through hole.
8. The intervertebral fusion cage with adjustable height and high stability for supplementing and pressurizing bone grafting according to claim 1, wherein the number of the limiting pins (7) is 2, the limiting pins (7) are respectively inserted into the threaded holes at the front end of the middle frame (1) in the upward and downward inclined directions, the position of the support plate (4) corresponding to the limiting pins (7) is provided with an open groove, and the open groove and the limiting pins (7) are mutually matched to prevent the support plate (4) from being separated from the middle frame (1) in the lifting process.
9. The intervertebral fusion device with high stability and adjustable height and capable of supplementing and pressurizing bone grafting according to claim 1 is characterized in that the tail part of one end of the screw rod (6) outside the middle frame (1) is provided with a triangular tangential circular groove matched with a fusion device implantation tool, and the thread spiral of one end of the screw rod (6) outside the middle frame (1) is opposite to the rotation direction of the screw rod (6) when the supporting plate (4) is lifted.
10. The high-stability intervertebral fusion cage with adjustable height and capable of supplementing and pressurizing bone grafting is characterized in that an included angle is formed between the upper supporting plate and the lower supporting plate (4), the included angle is 8.8-10 degrees, and the middle section of the outer surface of each supporting plate (4) is provided with reverse teeth, so that the bone grafting part under pressure on the same supporting plate is surrounded by the teeth which are reversed back and forth, 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 intervertebral pressure by the reverse teeth arranged on the upper supporting plate and the lower supporting plate.
11. The intervertebral fusion device with high stability for supplementing and pressurizing bone graft and adjustable height as claimed in claim 10, wherein the back section of the supporting plate (4) is provided with a bulge, the bulge is arched, and the bulge plays roles of fixing and preventing collapse.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010902458.1A CN112120836B (en) | 2020-09-01 | 2020-09-01 | Height-adjustable high-stability intervertebral fusion device capable of supplementing and pressurizing bone grafting |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010902458.1A CN112120836B (en) | 2020-09-01 | 2020-09-01 | Height-adjustable high-stability intervertebral fusion device capable of supplementing and pressurizing bone grafting |
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| CN112828697A (en) * | 2021-02-26 | 2021-05-25 | 青岛北船管业有限责任公司 | Pipe fitting equipment of polishing of adaptable different pipe diameters size |
| CN113558830A (en) * | 2021-08-31 | 2021-10-29 | 遵义医科大学附属医院 | Intervertebral fusion device capable of being propped open and being recycled under spinal endoscope |
| CN113768673A (en) * | 2021-08-31 | 2021-12-10 | 遵义医科大学附属医院 | Distraction-type recyclable synchronous bone grafting kit for intervertebral fusion under percutaneous spinal endoscopy |
| CN113967109A (en) * | 2021-08-10 | 2022-01-25 | 上海锐植医疗器械有限公司 | Fusion cage with adjustable height of posterior bone graft |
| CN115836930A (en) * | 2023-02-27 | 2023-03-24 | 珠海维尔康生物科技有限公司 | Minimally invasive fusion cage capable of achieving bilateral distraction and pressurization bone grafting |
| CN115969585A (en) * | 2023-01-10 | 2023-04-18 | 北京纳通医疗科技控股有限公司 | Bidirectional expandable fusion cage |
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