CN112656551A - Adjustable artificial vertebral body - Google Patents
Adjustable artificial vertebral body Download PDFInfo
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- CN112656551A CN112656551A CN202011509873.7A CN202011509873A CN112656551A CN 112656551 A CN112656551 A CN 112656551A CN 202011509873 A CN202011509873 A CN 202011509873A CN 112656551 A CN112656551 A CN 112656551A
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- otic placode
- vertebral body
- threaded rod
- pushing mechanism
- ejector pad
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- 230000007246 mechanism Effects 0.000 claims abstract description 49
- 210000002421 cell wall Anatomy 0.000 claims description 3
- 230000005012 migration Effects 0.000 claims description 3
- 238000013508 migration Methods 0.000 claims description 3
- 230000001105 regulatory effect Effects 0.000 claims 6
- 238000000034 method Methods 0.000 description 6
- 230000008569 process Effects 0.000 description 3
- 238000003780 insertion Methods 0.000 description 2
- 230000037431 insertion Effects 0.000 description 2
- 230000035479 physiological effects, processes and functions Effects 0.000 description 2
- 206010023509 Kyphosis Diseases 0.000 description 1
- 210000003484 anatomy Anatomy 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 201000010099 disease Diseases 0.000 description 1
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 208000037959 spinal tumor Diseases 0.000 description 1
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Abstract
The invention relates to the technical field of medical instruments, in particular to an adjustable artificial vertebral body. The adjustable artificial vertebral body comprises an upper vertebral body element, a lower vertebral body element, an upper vertebral body end cover and a lower vertebral body end cover, wherein the upper vertebral body end cover comprises an upper fixing plate, a first lug plate, a second lug plate, a pushing mechanism and a third lug plate; the top of the upper vertebral body element is provided with a groove, the upper fixing plate is positioned at the upper end of the upper vertebral body element, the first ear plate, the second ear plate, the pushing mechanism and the third ear plate are positioned inside the groove, and the side wall of the groove is provided with a connecting hole. The invention can adjust the angle of the upper vertebral body end cover according to the physiological curve of the angle of the vertebral body of a patient.
Description
Technical Field
The invention relates to the technical field of medical instruments, in particular to an adjustable artificial vertebral body.
Background
The artificial vertebral body is widely applied clinically as an effective vertebral body substitute, brings great convenience for treating diseases such as spinal tumors and the like, can restore the physiological anatomical structure of the spine and correct kyphosis, and has a very good effect on spinal stability reconstruction.
The end covers at the two ends of the artificial vertebral body are kept horizontal after being installed, the angle cannot be adjusted, and the end covers cannot be completely matched with the surface shape of the end plate of the human vertebral body, so that the end plate of the human vertebral body and the artificial vertebral body can only achieve limited point contact, and surface contact in the true sense cannot be realized, the mechanical conduction performance and stability of a vertebral body end plate-artificial vertebral body interface are influenced, the collapse is caused due to excessive local stress, and finally the delay or failure of the osseous fusion is caused.
Therefore, the technical problem to be solved by those skilled in the art needs to be solved how to provide an adjustable artificial vertebral body capable of adjusting the angle of the upper vertebral body end cap according to the angle physiological curve of the patient vertebral body.
Disclosure of Invention
The invention aims to provide an adjustable artificial vertebral body, which overcomes the defects of the prior art and can adjust the angle of an upper vertebral body end cover according to the angle physiological curve of a patient vertebral body.
The technical scheme adopted by the invention for solving the technical problems is as follows:
the utility model provides an artificial centrum of regulation formula, includes last centrum component, lower centrum component, is used for connecting the middle connecting piece of last centrum component and lower centrum component, installs the last centrum end cover in last centrum component upper end and installs the lower centrum end cover at lower centrum component lower extreme, and the inside that the centrum component can stretch into down centrum component when rotating middle connecting piece, last centrum end cover includes upper fixed plate, first otic placode, second otic placode, pushing mechanism and third otic placode, wherein:
the first ear plate is arranged on the lower end face of the upper fixing plate, the upper end of the second ear plate is hinged with the first ear plate, the lower end of the second ear plate is connected with the left end of the pushing mechanism, the right end of the pushing mechanism is connected to the side wall of the upper vertebral body element, and the lower end face of the upper fixing plate, corresponding to the front side and the rear side of the right end of the pushing mechanism, is provided with a third ear plate;
go up the top of centrum component and be provided with the recess, the upper fixed plate is located the upper end of centrum component, first otic placode, the second otic placode, pushing mechanism and third otic placode are located inside the recess, be provided with the connecting hole that is used for connecting pushing mechanism on the lateral wall of recess, the connecting hole is the screw hole or for perforating, the third otic placode articulates on the cell wall of recess, the second otic placode is by the upper left down tilt state to the right in the recess, pushing mechanism pushes away the second otic placode to vertical state gradually during to the position horizontal migration pushing mechanism of second otic placode, the second otic placode is lifted up by the in-process that the tilt state changes to vertical state gradually, it can to accord with centrum physiological curve's angle with the upper fixed plate adjustment.
Further, pushing mechanism includes fourth otic placode, first ejector pad and first threaded rod, the left end of fourth otic placode is articulated with the lower extreme of second otic placode, and the right-hand member of fourth otic placode is fixed with first ejector pad, and the threaded rod jack has been seted up to the right-hand member of first ejector pad, and during the left end of first threaded rod inserted the threaded rod jack, the right-hand member of first threaded rod was twisted in the connecting hole on the recess lateral wall soon, and the connecting hole is the screw hole, when twisting the spiral shell of first threaded rod through the instrument, first threaded rod moved to the recess inboard, promoted first ejector pad and pushed away the second otic placode left for the left end of an upper fixed plate lifts up.
Further, the left end of first threaded rod does not have the screw thread setting, and the left end of first threaded rod is provided with first snap ring, is provided with first snap ring spacing groove in the first threaded rod jack, and first snap ring is restricted in first snap ring spacing groove behind the threaded rod jack that the left end of first threaded rod inserted first ejector pad, and after first threaded rod counter-rotation, it moves right to drive first ejector pad and fourth otic placode by first snap ring, and second otic placode lower extreme moves right, and the angle reduces.
Further, the pushing mechanism has another arrangement mode, namely: the pushing mechanism comprises a fifth lug plate, a second push block and a second threaded rod, the left end of the fifth lug plate is hinged with the lower end of the second lug plate, the right end of the fifth lug plate is fixedly provided with the second push block, the inner cavity of the second push block is provided with a threaded rod perforation, the second push block in the threaded rod perforation is provided with a circle of accommodating groove, the accommodating groove is internally provided with an inner push block, the inner push block is provided with a first threaded hole matched with the second threaded rod, the second threaded rod penetrates through the threaded rod perforation, the left end of the second threaded rod is screwed into the first threaded hole, the right end of the second threaded rod extends into the connecting hole, the connecting hole is a perforation, the right end of the second threaded rod is also provided with a nut, the nut is provided with a circle of second snap ring, a second snap ring limiting groove is arranged in the connecting hole, when the nut of the second threaded rod is screwed by a tool, under the limitation of the second snap ring, the second, therefore, the inner pushing block in threaded connection with the second threaded rod moves leftwards or rightwards in the accommodating groove, and when the inner pushing block moves leftwards, the second pushing block is pushed leftwards to push the second lug plate, so that the left end of the upper fixing plate is lifted.
Furthermore, the right side surface of the first ear plate is an arc-shaped surface extending rightwards, a first convex block is arranged on the upper end surface of the first push block, the top of the first convex block abuts against the arc-shaped surface of the first ear plate, and the arc-shaped surface of the first ear plate is matched with the moving track of the first convex block; when the pushing mechanism pushes the second ear plate to the left, the first lug also serves as a force application point to assist in lifting the upper fixing plate.
Furthermore, the right side surface of the first ear plate is an arc-shaped surface extending rightwards, a second convex block is arranged on the upper end surface of the second push block, the top of the second convex block abuts against the arc-shaped surface of the first ear plate, and the arc-shaped surface of the first ear plate is matched with the moving track of the second convex block; when the pushing mechanism pushes the second ear plate to the left, the second lug also serves as a force application point to assist in lifting the upper fixing plate.
Furthermore, the two first ear plates are arranged at intervals in the front and back, and the left end of the second ear plate is hinged between the two first ear plates; the right end of the second lug plate is hinged between the two fourth lug plates or hinged between the two fifth lug plates; this arrangement is advantageous for improving stability during adjustment of the superior end cap.
Furthermore, the third otic placode is provided with two at the interval around, pushing mechanism is located between two front and back third otic placodes.
The invention has the beneficial effects that: compared with the prior art, the adjustable artificial vertebral body has the following advantages: the upper vertebral body end cover can be flexibly adjusted according to the physiological curve of the vertebral body of a patient: the second otic placode is by upper left lower right slant state in the recess, and pushing mechanism pushes away the second otic placode to vertical state gradually when the position horizontal migration pushing mechanism of second otic placode, and the in-process upper fixed plate that changes to the vertical state by the slope state at the second otic placode is lifted up gradually, and it can to accord with centrum physiology curved angle with the adjustment of upper fixed plate.
Drawings
FIG. 1 is a schematic front view of the overall structure of embodiment 1 of the present invention in an initial state;
FIG. 2 is a schematic sectional view A-A' of FIG. 1 according to the present invention;
FIG. 3 is a schematic view of the general structure of embodiment 1 of the present invention adjusted to the use state;
FIG. 4 is a schematic cross-sectional view of the structure of FIG. 3B-B' according to the present invention;
FIG. 5 is an enlarged view of the structure of the area C of FIG. 4 according to the present invention;
fig. 6 is a schematic perspective view of a pushing mechanism according to embodiment 1 of the present invention;
FIG. 7 is a schematic perspective view of another pushing mechanism according to embodiment 1 of the present invention;
FIG. 8 is a schematic structural view of embodiment 2 of the present invention, which is partially cut;
fig. 9 is a schematic perspective view of a pushing mechanism according to embodiment 2 of the present invention;
FIG. 10 is a schematic perspective view of another pushing mechanism according to embodiment 2 of the present invention;
the device comprises a 1 upper vertebral body element, a 2 lower vertebral body element, a 3 upper vertebral body end cover, a 4 lower vertebral body end cover, a 5 middle connecting piece, a 6 upper fixing plate, a 7 first lug plate, a 8 second lug plate, a 9 pushing mechanism, a 901 fourth lug plate, a 902 first push block, a 903 first threaded rod, a 904 threaded rod jack, a 905 first snap ring, a 906 first snap ring limiting groove, a 907 first lug, 908 fifth lug plate, a 909 second push block, 910 second threaded rod, 911 threaded rod through hole, 912 inner push block, 913 first threaded hole, 914 second snap ring, 915 second snap ring limiting groove, 916 second lug, 10 third lug plate, 11 groove, 12 connecting hole, 13 external thread, 14 external edge, 15 internal thread and 16 external edge clamping grooves.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention.
Example 1
In the embodiment shown in fig. 1-7, an adjustable artificial vertebral body comprises an upper vertebral body element 1, a lower vertebral body element 2, an intermediate connector 5 for connecting the upper vertebral body element 1 and the lower vertebral body element 2, an upper vertebral body end cap 3 mounted on the upper end of the upper vertebral body element 1 and a lower vertebral body end cap 4 mounted on the lower end of the lower vertebral body element 2, wherein the upper vertebral body element 1 can extend into the lower vertebral body element 2, and the upper vertebral body end cap 3 comprises an upper fixing plate 6, a first ear plate 7, a second ear plate 8, a pushing mechanism 9 and a third ear plate 10, wherein:
the first ear plate 7 is arranged on the lower end face of the upper fixing plate 6, the upper end of the second ear plate 8 is hinged with the first ear plate 7, the lower end of the second ear plate 8 is connected with the left end of the pushing mechanism 9, the right end of the pushing mechanism 9 is connected to the side wall of the upper vertebral body element 1, and the lower end face of the upper fixing plate 6 corresponding to the front side and the rear side of the right end of the pushing mechanism 9 is provided with a third ear plate 10;
the top of going up centrum component 1 is provided with recess 11, upper fixing plate 6 is located the upper end of last centrum component 1, first otic placode 7, second otic placode 8, pushing mechanism 9 and third otic placode 10 are located inside recess 11, be provided with connecting hole 12 that is used for connecting pushing mechanism 9 on the lateral wall of recess 11, connecting hole 12 is the screw hole or for perforating, third otic placode 10 articulates on the cell wall of recess 11, second otic placode 8 is by the upper left down tilt state to the right in recess 11, pushing mechanism 9 pushes away second otic placode 8 to vertical state gradually when moving pushing mechanism 9 to the position horizontal of second otic placode 8, upper fixing plate 6 is lifted gradually by the in-process that the vertical state changes by tilt state at second otic placode 8, it can to accord with the angle of centrum physiology curve with upper fixing plate 6 adjustment.
In this embodiment, the pushing mechanism 9 includes a fourth ear plate 901, a first pushing block 902 and a first threaded rod 903, a left end of the fourth ear plate 901 is hinged to a lower end of the second ear plate 8, the first pushing block 902 is fixed to a right end of the fourth ear plate 901, a threaded rod jack 904 is formed in the right end of the first pushing block 902, a left end of the first threaded rod 903 is inserted into the threaded rod jack 904, a right end of the first threaded rod 903 is screwed into a connecting hole 12 in a side wall of the groove 11, the connecting hole 12 is a threaded hole, when a nut of the first threaded rod 903 is screwed by a tool, the first threaded rod 903 moves towards an inner side of the groove 11, the first pushing block 902 is pushed to push the second ear plate 8 to the left, so that the left end of the upper fixing plate 6 is lifted.
In this embodiment, the left end of the first threaded rod 903 is provided with no thread, the left end of the first threaded rod 903 is provided with a first snap ring 905, the first threaded rod insertion hole 904 is provided with a first snap ring limiting groove 906, and the first snap ring 905 is limited in the first snap ring limiting groove 906 after the left end of the first threaded rod 903 is inserted into the threaded rod insertion hole 904 of the first push block 902.
In this embodiment, the right side surface of the first ear plate 7 is an arc surface extending rightward, the upper end surface of the first push block 902 is provided with a first protrusion 907, the top of the first protrusion 907 abuts against the arc surface of the first ear plate 7, and the arc surface of the first ear plate 7 is matched with the moving track of the first protrusion 907; so that the first protrusion 907 also serves as a point of application to assist in lifting the upper fixing plate 6 when the pushing mechanism 9 pushes the second ear plate 8 to the left.
In this embodiment, the first ear plates 7 are arranged in two at intervals in the front and back, and the left end of the second ear plate 8 is hinged between the two first ear plates 7; the four ear plates 901 are arranged in a front-back interval mode, the right end of the second ear plate 8 is hinged between the two fourth ear plates 901, and the arrangement mode is favorable for improving the stability of the upper vertebral body end cover 3 in the adjusting process.
In this embodiment, the third ear plate 10 is provided with two third ear plates at intervals in the front and back, and the pushing mechanism 9 is located between the front and back third ear plates.
The working principle is as follows: according to the adjustable artificial vertebral body, the second ear plate 8 is in a state of inclining from top left to bottom right in the groove 11, when the pushing mechanism 9 is horizontally moved to the position of the second ear plate 8, the pushing mechanism 9 gradually pushes the second ear plate 8 to be in a vertical state, the upper fixing plate 6 is gradually lifted in the process that the second ear plate 8 changes from the inclined state to the vertical state, the first bump 907 is also used as a force application point to assist in lifting the upper fixing plate 6 in the process, and the upper fixing plate 6 is adjusted to an angle according with a physiological curve of the vertebral body.
Example 2
Example 2 is essentially the same set up as example 1, with the difference that: as shown in fig. 8-10, the pushing mechanism 9 is realized by another arrangement, namely: the pushing mechanism 9 comprises a fifth ear plate 908, a second pushing block 909 and a second threaded rod 910, the left end of the fifth ear plate 908 is hinged to the lower end of the second ear plate 8, the right end of the fifth ear plate 908 is fixed with the second pushing block 909, a threaded rod through hole 911 is formed in the inner cavity of the second pushing block 909, a circle of accommodating groove is formed in the threaded rod through hole 911, an inner pushing block 912 is arranged in the accommodating groove, a first threaded hole 913 matched with the second threaded rod 910 is formed in the inner pushing block 912, the left end of the second threaded rod 910 is screwed into the first threaded hole 913, the right end of the second threaded rod 910 extends into the connecting hole 12, the connecting hole 12 is a through hole, a nut is further arranged at the right end of the second threaded rod 910, a circle of second snap ring 914 is arranged on the nut, a second snap ring limiting groove 915 is formed in the connecting hole 12, when the nut of the second threaded rod 910 is screwed by a tool, the second threaded rod 910 only rotates circumferentially but the left-right position is not changed, which causes the inner pushing block 912 screwed with the second threaded rod 910 to move left or right in the accommodating groove, and when the inner pushing block 912 moves left, the inner pushing block 909 pushes the second ear plate 8 left, so that the left end of the upper fixing plate 6 is lifted.
In this embodiment, the right side surface of the first ear plate 7 is an arc surface extending rightward, the upper end surface of the second push block 909 is provided with a second bump 916, the top of the second bump 916 abuts against the arc surface of the first ear plate 7, and the arc surface of the first ear plate 7 is matched with the moving track of the second bump 916; so that the second projection 916 also serves as a point of application to assist in lifting the upper fixing plate 6 when the pushing mechanism 9 pushes the second ear plate 8 to the left.
The above embodiments are only specific examples of the present invention, and the protection scope of the present invention includes but is not limited to the product forms and styles of the above embodiments, and any suitable changes or modifications made by those skilled in the art according to the claims of the present invention shall fall within the protection scope of the present invention.
Claims (8)
1. An adjustable artificial vertebral body, which comprises an upper vertebral body element, a lower vertebral body element, an intermediate connecting piece for connecting the upper vertebral body element and the lower vertebral body element, an upper vertebral body end cover arranged at the upper end of the upper vertebral body element and a lower vertebral body end cover arranged at the lower end of the lower vertebral body element, and is characterized in that: go up centrum end cover includes an upper fixed plate, first otic placode, second otic placode, pushing mechanism and third otic placode, wherein:
the first ear plate is arranged on the lower end face of the upper fixing plate, the upper end of the second ear plate is hinged with the first ear plate, the lower end of the second ear plate is connected with the left end of the pushing mechanism, the right end of the pushing mechanism is connected to the side wall of the upper vertebral body element, and the lower end face of the upper fixing plate, corresponding to the front side and the rear side of the right end of the pushing mechanism, is provided with a third ear plate;
go up the top of centrum component and be provided with the recess, the upper fixed plate is located the upper end of centrum component, first otic placode, the second otic placode, pushing mechanism and third otic placode are located inside the recess, be provided with the connecting hole that is used for connecting pushing mechanism on the lateral wall of recess, the connecting hole is the screw hole or for the perforation, the third otic placode articulates on the cell wall of recess, the second otic placode is the tilt state in the recess, push away the second otic placode to vertical state gradually when the position horizontal migration pushing mechanism of second otic placode, the upper fixed plate is lifted up.
2. A regulating artificial vertebral body according to claim 1, wherein: pushing mechanism includes fourth otic placode, first ejector pad and first threaded rod, the left end of fourth otic placode is articulated with the lower extreme of second otic placode, and the right-hand member of fourth otic placode is fixed with first ejector pad, and the threaded rod jack has been seted up to the right-hand member of first ejector pad, and during the left end of first threaded rod inserted the threaded rod jack, the right-hand member of first threaded rod was twisted soon in the connecting hole on the recess lateral wall, and the connecting hole is the screw hole.
3. A regulating artificial vertebral body according to claim 2, wherein: the left end of first threaded rod does not have the screw thread setting, and the left end of first threaded rod is provided with first snap ring, is provided with first snap ring spacing groove in the first threaded rod jack, and first snap ring is restricted in first snap ring spacing groove behind the threaded rod jack that the left end of first threaded rod inserted first ejector pad.
4. A regulating artificial vertebral body according to claim 1, wherein: pushing mechanism includes fifth otic placode, second ejector pad and second threaded rod, the left end of fifth otic placode is articulated with the lower extreme of second otic placode, the right-hand member of fifth otic placode is fixed with the second ejector pad, the threaded rod perforation has been seted up to the inner chamber of second ejector pad, be provided with round holding recess in the threaded rod perforation, be provided with interior ejector pad in the holding recess, set up on the interior ejector pad with the first screw hole of second threaded rod matched with, in the first screw hole of left end screw in of second threaded rod, the right-hand member of second threaded rod stretches into the connecting hole, the connecting hole is the perforation, the right-hand member of second threaded rod still is provided with the nut, be provided with round second snap ring on the nut, be provided with second snap ring spacing groove in the connecting hole.
5. A regulating artificial vertebral body according to claim 3, wherein: the right flank of first otic placode is the arcwall face of extending right, the up end of first ejector pad is provided with first lug, and the top of first lug is contradicted on the arcwall face of first otic placode, and the arcwall face of first otic placode cooperatees with the removal orbit of first lug.
6. A adjustable artificial vertebral body according to claim 4, wherein: the right flank of first otic placode is the arcwall face of extending right, the up end of second ejector pad is provided with the second lug, and the top of second lug is contradicted on the arcwall face of first otic placode, and the arcwall face of first otic placode cooperatees with the removal orbit of second lug.
7. A regulating artificial vertebral body according to claim 5 or 6, wherein: the two first ear plates are arranged at intervals in the front and at the back, and the left end of the second ear plate is hinged between the two first ear plates; the fourth otic placode is provided with two at the interval around, and the interval is provided with two around the fifth otic placode, and the right-hand member of second otic placode articulates between two fourth otic placodes, or articulates between two fifth otic placodes.
8. A regulating artificial vertebral body according to claim 5 or 6, wherein: the third otic placode is provided with two at the interval around, pushing mechanism is located between two front and back third otic placodes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011509873.7A CN112656551A (en) | 2020-12-18 | 2020-12-18 | Adjustable artificial vertebral body |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011509873.7A CN112656551A (en) | 2020-12-18 | 2020-12-18 | Adjustable artificial vertebral body |
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| Publication Number | Publication Date |
|---|---|
| CN112656551A true CN112656551A (en) | 2021-04-16 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011509873.7A Pending CN112656551A (en) | 2020-12-18 | 2020-12-18 | Adjustable artificial vertebral body |
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| CN (1) | CN112656551A (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105796215A (en) * | 2016-05-27 | 2016-07-27 | 瞿玉兴 | Intervertebral fusion cage capable of strutting lumbar vertebra |
| CN107106305A (en) * | 2014-11-04 | 2017-08-29 | 华沙整形外科股份有限公司 | Implant between expandable centrum |
| CN211485106U (en) * | 2019-10-25 | 2020-09-15 | 创生医疗器械（中国）有限公司 | Distractable vertebral body implant |
| CN112057210A (en) * | 2020-08-11 | 2020-12-11 | 上海三友医疗器械股份有限公司 | Expandable artificial vertebral body and mounting tool thereof |
-
2020
- 2020-12-18 CN CN202011509873.7A patent/CN112656551A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107106305A (en) * | 2014-11-04 | 2017-08-29 | 华沙整形外科股份有限公司 | Implant between expandable centrum |
| CN105796215A (en) * | 2016-05-27 | 2016-07-27 | 瞿玉兴 | Intervertebral fusion cage capable of strutting lumbar vertebra |
| CN211485106U (en) * | 2019-10-25 | 2020-09-15 | 创生医疗器械（中国）有限公司 | Distractable vertebral body implant |
| CN112057210A (en) * | 2020-08-11 | 2020-12-11 | 上海三友医疗器械股份有限公司 | Expandable artificial vertebral body and mounting tool thereof |
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