Intervertebral fusion device
阅读说明:本技术 椎间融合器 (Intervertebral fusion device ) 是由 邹丽敏 杨海东 孙君 李顺锋 李想 于 2019-11-15 设计创作,主要内容包括:本发明涉及一种椎间融合器,椎间融合器包括轴体、第一撑开件及融合体,第一撑开件安装于轴体上并能够沿轴体的轴向移动,第一撑开件具有沿轴体的径向上分布的内端和外端,内端与轴体连接,融合体绕轴体周向设置,并与第一撑开件的外端连接,融合体的内壁上开设有第一滑道,第一滑道的延伸方向与融合体的外壁之间设有夹角,第一撑开件的外端活动设于第一滑道中。上述椎间融合器中,第一撑开件沿第一滑道滑动能改变融合体与轴体之间的距离,从而改变椎间融合器撑开的大小,椎间融合器植入时能够根据椎间隙的具体情况调节椎间融合器的撑开范围,增大与椎体间隙的接触面以对椎间隙更好的匹配,并维持了椎间隙的高度,恢复了腰椎生理曲度。(The invention relates to an interbody fusion cage which comprises a shaft body, a first spreading piece and a fusion body, wherein the first spreading piece is arranged on the shaft body and can move along the axial direction of the shaft body, the first spreading piece is provided with an inner end and an outer end which are distributed along the radial direction of the shaft body, the inner end is connected with the shaft body, the fusion body is arranged around the circumferential direction of the shaft body and is connected with the outer end of the first spreading piece, a first slide way is arranged on the inner wall of the fusion body, an included angle is formed between the extending direction of the first slide way and the outer wall of the fusion body, and the outer end of the first spreading piece is movably arranged in the first slide way. Among the above-mentioned interbody fusion cage, first piece of strutting can change the distance between fusion body and the axis body along first slide slip to change interbody fusion cage size of strutting, can adjust interbody fusion cage's the scope of strutting according to the particular case in intervertebral space when interbody fusion cage implants, increase and the contact surface in intervertebral space in order to the better matching in intervertebral space, and maintained the height in intervertebral space, recovered the physiological curvature of lumbar vertebrae.)
1. An intervertebral cage, comprising:
a shaft body;
the first spreading piece is arranged on the shaft body and can move along the axial direction of the shaft body, the first spreading piece is provided with an inner end and an outer end which are distributed along the radial direction of the shaft body, and the inner end is connected with the shaft body; and
the fusion body is arranged around the circumference of the shaft body and is connected with the outer end of the first opening piece, a first slide way is arranged on the inner wall of the fusion body, an included angle is formed between the extending direction of the first slide way and the outer wall of the fusion body, and the outer end of the first opening piece is movably arranged in the first slide way.
2. An intersomatic cage according to claim 1, wherein the first spreader includes a first threaded ring and a plurality of first struts, the first threaded ring being disposed around the shaft and being in threaded connection with the shaft, the first struts connecting the first threaded ring and the first runner.
3. An intersomatic cage according to claim 2, wherein a plurality of the first struts are circumferentially arranged around the threaded ring, and a plurality of the first runners are provided in one-to-one correspondence with the first struts.
4. An intersomatic cage according to claim 2, characterized in that a plurality of the first struts are arranged circumferentially and uniformly around the first turn of thread.
5. An intersomatic cage according to claim 2, wherein the first strut comprises a first body and a first shaft, the first body connecting the first shaft to the first threaded ring, the first shaft being disposed in the first slideway.
6. The intervertebral fusion cage of claim 1, wherein the inner walls of the two sides of the first slideway are extended with bending portions, and the two bending portions extend along directions close to each other, and the outer end of the first distraction piece is clamped in the first slideway and is abutted against the bending portions.
7. An intersomatic cage according to claim 1, wherein the outer end of the first spreader is in interference connection with the first slideway.
8. An intersomatic cage according to claim 1, characterized in that the first slideway has an inner end and an outer end distributed in the longitudinal direction of the shaft, the first slideway being progressively closer to the shaft in the direction from the outer end of the first slideway to the inner end of the first slideway.
9. An intersomatic cage according to claim 1, characterized in that the cage has an avoidance slot in its inner wall, parallel to the shaft, in which a part of the shaft is received.
10. The intersomatic cage according to any one of claims 1 to 9, further comprising a second spreader, the second spreader having a structure the same as that of the first spreader, the second spreader being mounted on the shaft, a second slideway being further formed in an inner wall of the fusion body, an included angle being formed between an extending direction of the second slideway and an outer wall of the fusion body, the second slideway and the first slideway being arranged in a central symmetry with respect to a midpoint of the shaft, and an outer end of the second spreader being movably disposed in the second slideway.
11. An intersomatic cage according to claim 10, wherein the shaft body has first and second threads at opposite ends thereof, the first and second threads being opposite in direction of rotation, the first distracting member being threadedly coupled to the first thread, and the second distracting member being threadedly coupled to the second thread.
12. An intersomatic cage according to claim 11, characterized in that the pitch of the first thread is greater than the pitch of the second thread.
13. An intersomatic cage according to claim 11, characterized in that a stop section is provided between the first and second threads of the shaft body, which stop section can limit the movement of the first or second distracting element.
14. An intersomatic cage according to claim 10, characterized in that the second slideway has an inner end and an outer end distributed in the longitudinal direction of the shaft, the second slideway being progressively closer to the shaft in the direction from the outer end of the second slideway to the inner end of the second slideway.
15. The intervertebral fusion device according to any one of claims 1 to 9, wherein the shaft body comprises a first shaft body and a second shaft body, the first shaft body and the second shaft body are coaxially arranged at intervals, the first shaft body is provided with a first operation hole extending in the axial direction of the first shaft body and penetrating through the first shaft body, the second shaft body is provided with a second operation hole, the second operation hole is arranged opposite to the first operation hole, the intervertebral fusion device further comprises a second distraction member having the same structure as the first distraction member, the fusion body is further provided with a second slideway, an included angle is formed between the extending direction of the second slideway and the outer wall of the fusion body, and the outer end of the second distraction member is movably arranged in the second slideway.
16. An intersomatic cage according to claim 15, characterized in that the first shaft is provided with a thread and the second shaft is provided with a thread, the threads of the first shaft being of opposite hand to the threads of the second shaft.
17. An intersomatic cage according to claim 1, wherein the fusion comprises four fusion portions arranged circumferentially and spaced around the shaft.
18. An intersomatic cage according to claim 1, characterized in that the opposite faces of the cage are provided with teeth.
19. An intersomatic cage according to claim 1, characterized in that the fusion has an hollowed-out structure inside.
20. An intersomatic cage according to claim 19, characterized in that the fusion has an outer wall at least partially provided with hollows for communicating with hollows inside the fusion, the hollows being at a determined distance from the inner wall of the fusion.
Technical Field
The invention relates to the field of medical instruments, in particular to an intervertebral fusion cage.
Background
Degenerative lumbar diseases (including lumbar spinal stenosis, lumbar spondylolisthesis, degenerative lateral curvature, disc-derived diseases and the like) and structural damage thereof are important causes of pain in the waist and lower extremities, and damage and even loss of sensory and motor functions of a human body, and the treatment principle is to relieve nerve compression and reconstruct the stability of the spine. The intervertebral fusion cage is implanted into the affected part of the intervertebral disease to expand, compress and stabilize the damaged intervertebral space, and has gradually developed into a standard means for treating the lumbar degenerative disease.
Due to the special physiological structure of the lumbar intervertebral space, after the conventional intervertebral fusion cage is implanted into the intervertebral space, the two requirements of recovering the intervertebral space height and increasing the contact surface of the fusion cage and the upper and lower final plates are difficult to meet simultaneously, and the treatment effect after the operation is influenced.
Disclosure of Invention
Therefore, the intervertebral fusion device has high matching degree with the lumbar intervertebral space and good fusion effect of the vertebral body space.
An intervertebral cage comprising:
a shaft body;
the first spreading piece is arranged on the shaft body and can move along the axial direction of the shaft body, the first spreading piece is provided with an inner end and an outer end which are distributed along the radial direction of the shaft body, and the inner end is connected with the shaft body; and
the fusion body is arranged around the circumference of the shaft body and is connected with the outer end of the first opening piece, a first slide way is arranged on the inner wall of the fusion body, an included angle is formed between the extending direction of the first slide way and the outer wall of the fusion body, and the outer end of the first opening piece is movably arranged in the first slide way.
Among the above-mentioned interbody fusion cage, first piece of strutting can change the distance between fusion body and the axis body along first slide slip to change interbody fusion cage size of strutting, can adjust interbody fusion cage's the scope of strutting according to the particular case in intervertebral space when interbody fusion cage implants the sick affected part, increase and the contact surface in intervertebral space with the adaptation and the matching better to intervertebral space, still maintained the height in intervertebral space, recovered lumbar vertebrae physiology curvature. Meanwhile, the intervertebral fusion cage has smaller closed volume before being implanted, and can meet the requirements of different operation approaches (anterior approach, posterior approach and transforaminal approach) on the volume of the intervertebral fusion cage.
In one embodiment, the first spreader includes a first thread ring and a plurality of first struts, the first thread ring is sleeved on the shaft and is in threaded connection with the shaft, and the first struts are connected with the first thread ring and the first slideway.
In one embodiment, a plurality of first supporting rods are circumferentially arranged around the thread ring, and a plurality of first slideways are arranged and correspond to the first supporting rods one to one.
In one embodiment, the first support rods are circumferentially and uniformly arranged around the first thread turn.
In one embodiment, the first support rod includes a first body and a first shaft rod, the first body connects the first shaft rod and the first thread ring, and the first shaft rod is disposed in the first slideway.
In one embodiment, the inner walls of the two sides of the first slide way extend to form bending portions, the two bending portions extend in the direction close to each other, and the outer end of the first spreading member is clamped in the first slide way and abutted against the bending portions.
In one embodiment, the outer end of the first spreader is in interference fit with the first runner.
In one embodiment, the first slideway has an inner end and an outer end distributed along the longitudinal direction of the shaft body, and the first slideway is gradually close to the shaft body along the direction from the outer end of the first slideway to the inner end of the first slideway.
In one embodiment, the inner wall of the fusion body is further provided with an avoiding groove, the avoiding groove is parallel to the shaft body, and part of the shaft body is accommodated in the avoiding groove.
In one embodiment, the portable folding device further comprises a second spreading member, the second spreading member and the first spreading member have the same structure, the second spreading member is mounted on the shaft body, a second slide way is further formed in the inner wall of the fusion body, an included angle is formed between the extending direction of the second slide way and the outer wall of the fusion body, the second slide way and the first slide way are arranged in central symmetry about the midpoint of the shaft body, and the outer end of the second spreading member is movably arranged in the second slide way.
In one embodiment, a first thread and a second thread are respectively arranged at two ends of the shaft body, the turning directions of the first thread and the second thread are opposite, the first spreading member is in threaded connection with the first thread, and the second spreading member is in threaded connection with the second thread.
In one embodiment, the pitch of the first thread is greater than the pitch of the second thread.
In one embodiment, a limiting section is arranged between the first thread and the second thread of the shaft body, and the limiting section can limit the movement of the first spreading piece or the second spreading piece.
In one embodiment, the second slideway has an inner end and an outer end distributed along the longitudinal direction of the shaft body, and the second slideway is gradually close to the shaft body along the direction from the outer end of the second slideway to the inner end of the second slideway.
In one embodiment, the shaft body includes a first shaft body and a second shaft body, the first shaft body and the second shaft body are coaxially arranged at intervals, the first shaft body is provided with a first operation hole which extends along the axial direction of the first shaft body and is through, the second shaft body is provided with a second operation hole, the second operation hole is opposite to the first operation hole, the shaft body further includes a second opening member which has the same structure as the first opening member, the fusion body is further provided with a second slide way, an included angle is formed between the extending direction of the second slide way and the outer wall of the fusion body, and the outer end of the second opening member is movably arranged in the second slide way.
In one embodiment, the first shaft body is provided with threads, the second shaft body is provided with threads, and the threads of the first shaft body and the threads of the second shaft body are opposite in rotation direction.
In one embodiment, the fusion body comprises four fusion portions, and the four fusion portions are arranged around the shaft body at intervals.
In one embodiment, the fusion body is provided with teeth on two opposite sides.
In one embodiment, the fusion body has a hollow structure inside.
In one embodiment, at least part of the outer wall of the fusion body is provided with a hollowed hole to communicate with a hollowed structure inside the fusion body, and the hollowed structure has a predetermined distance from the inner wall of the fusion body.
Drawings
FIG. 1 is a schematic view of an embodiment of an intervertebral cage;
FIG. 2 is a schematic view of a first distractor of the intervertebral cage of FIG. 1;
FIG. 3 is a schematic view of the fusion portion of the intervertebral cage of FIG. 1;
FIG. 4 is an assembly view of the fusion portion and the first distractor of the intervertebral cage shown in FIG. 1;
FIG. 5 is a cross-sectional view of a fusion in the intervertebral cage of FIG. 1;
FIG. 6 is a side view of the intervertebral cage of FIG. 1 in an expanded configuration;
FIG. 7 is a side view of the cage of FIG. 1 in a closed position;
FIG. 8 is a schematic view of a second distractor of the intervertebral cage of FIG. 1;
FIG. 9 is a side view of another embodiment interbody cage in an expanded state;
FIG. 10 is a schematic view of a fusion portion of the intervertebral cage of FIG. 1;
fig. 11 is a schematic view of the intervertebral cage of fig. 1 in an operational state.
Detailed Description
To facilitate an understanding of the invention, the invention will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only and do not represent the only embodiments.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
Referring to fig. 1, one embodiment of an
Among the above-mentioned
In one embodiment, the
Referring to fig. 3 to 5, the inner walls of the two sides of the first sliding
In one embodiment, the inner wall of the
Referring to fig. 6 and 7, in one embodiment, the
Further, with reference to fig. 4, the
Referring to fig. 8, more specifically, the
Referring to fig. 3, the inner walls of the two sides of the
In one embodiment, the second sliding
Referring to fig. 6, in one embodiment, a limiting
Referring to fig. 9, in one embodiment, in order to adjust the degree of expansion of the two ends of the fusion cage more freely, the
In one embodiment, a position-limiting
Referring to fig. 10, in one embodiment, opposing faces of the
It should be noted that the
Referring to fig. 11, with the
The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above examples only show some embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
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