CN210096002U - Artificial intervertebral disc - Google Patents
Artificial intervertebral disc Download PDFInfo
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- CN210096002U CN210096002U CN201920569397.4U CN201920569397U CN210096002U CN 210096002 U CN210096002 U CN 210096002U CN 201920569397 U CN201920569397 U CN 201920569397U CN 210096002 U CN210096002 U CN 210096002U
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- metal plate
- screw hole
- vertebral body
- intervertebral disc
- lower metal
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Abstract
The utility model provides an artificial intervertebral disc relates to intervertebral disc substitution device technical field, include for with last metal sheet of last centrum contact, for with the lower metal sheet of lower centrum contact, set up in last metal sheet and down the buffering nuclear between the metal sheet and wear to locate first mounting and the second mounting that comprises bioabsorbable material of metal sheet and lower metal sheet. The first fixing piece penetrates through the second screw hole of the upper metal plate and the third screw hole of the lower metal plate to enter the lower vertebral body, and the second fixing piece penetrates through the fifth screw hole of the lower metal plate and the sixth screw hole of the upper metal plate to enter the upper vertebral body. In the initial stage of implantation, the upper and lower metal plates of the artificial intervertebral disc are temporarily prevented from moving relative to the upper and lower vertebrae due to the fixation of the first and second fixing members, and the artificial intervertebral disc can move freely after the bioabsorbable material is absorbed.
Description
Technical Field
The utility model relates to an intervertebral disc replacing device, in particular to an artificial intervertebral disc which can move freely.
Background
In recent years, spinal cord injury and deterioration of the intervertebral discs of the spine are major causes of back pain and spinal disorders. After degeneration of intervertebral discs between vertebral bodies, the treatment mode is that the vertebral bodies are fused to make the upper vertebral body and the lower vertebral body of the intervertebral disc immovable or the intervertebral disc is placed into a prosthesis to keep the mobility, and the current trend of treating the diseases is to replace the natural spinal disc of a patient by using an artificial implant through surgical operations.
Artificial intervertebral discs may be classified as limiting, semi-limiting, and non-limiting depending on the range and nature of motion. An artificial disc is generally referred to as restrictive if it limits its range of motion to less than the physiological range of motion; an artificial disc is considered semi-limiting if it limits its range of motion to a range approximating physiological activity; and is said to be non-limiting if the prosthetic disc itself has no mechanical stop for motion, but relies on the inherent pressure in the soft tissue surrounding the spine and in the disc space to limit excessive motion.
In the prior art, the artificial intervertebral disc is composed of an upper metal plate and a lower metal plate which are respectively contacted with an upper vertebral body and a lower vertebral body, a plastic component is arranged between the two metal plates, the contact surface of the upper metal plate and the middle plastic component is a joint surface, and the upper metal plate can move back and forth, left and right and rotate by means of the joint surface.
However, in the initial stage of implantation of the artificial intervertebral disc in the prior art, the bone at the contact part between the upper and lower metal plate structures and the vertebral body is not grown yet, so that the movement of the artificial intervertebral disc body can cause the loosening between the artificial intervertebral disc and the vertebral body, and the operation fails.
SUMMERY OF THE UTILITY MODEL
In order to overcome the above problems and other problems, the utility model provides an artificial intervertebral disc arranged between an upper vertebral body and a lower vertebral body, which can achieve the effect of free movement.
The utility model discloses artificial intervertebral disc includes: an upper metal plate for contacting the upper vertebral body; a lower metal plate for contacting with a lower vertebral body; the buffer core is arranged between the upper metal plate and the lower metal plate; and the first fixing piece penetrates through the upper metal plate and the lower metal plate and enters the lower vertebral body, and the second fixing piece penetrates through the lower metal plate and the upper metal plate and enters the upper vertebral body.
Secondly, the upper metal plate comprises a second screw hole and the lower metal plate comprises a third screw hole, and the first fixing piece sequentially passes through the second screw hole and the third screw hole to enter the lower vertebral body. Third, the lower metal plate includes a fifth screw hole and the upper metal plate includes a sixth screw hole, and the second fixing piece sequentially passes through the fifth screw hole and the sixth screw hole to enter the superior vertebral body. Furthermore, the first fixing part and the second fixing part are screws made of bioabsorbable materials, and the penetrating direction of the first fixing part is staggered with the penetrating direction of the second fixing part.
The utility model discloses artificial intervertebral disc further includes the fixed plate, and this fixed plate spanes this and goes up centrum and this and attached in this and go up centrum and this lower centrum, and this fixed plate is the hone lamella that comprises bioabsorbable material.
In addition, the first fixing piece penetrates through the fixing plate, the upper metal plate and the lower metal plate and enters the lower vertebral body, and the second fixing piece penetrates through the fixing plate, the lower metal plate and the upper metal plate and enters the upper vertebral body. Secondly, this fixed plate includes first screw hole, and this last metal sheet includes the second screw hole and this lower metal sheet includes the third screw hole, and this first mounting passes this first screw hole, this second screw hole and this third screw hole in order to get into this lower centrum. And thirdly, the fixing plate comprises a fourth screw hole, the lower metal plate comprises a fifth screw hole and the upper metal plate comprises a sixth screw hole, and the second fixing piece sequentially passes through the fourth screw hole, the fifth screw hole and the sixth screw hole to enter the upper vertebral body.
Therefore, the utility model discloses an upper and lower metal sheet of artificial intervertebral disc respectively opens two or more screw holes, adopt bioabsorbable material as the screw, be the screw entry by last metal sheet screw hole, pass metal sheet about the fixed of metal sheet screw hole down, penetrate the centrum again, make implant initial stage artificial intervertebral disc because of the fixed temporarily unable activity of bioabsorbable screw, metal sheet and centrum contact site do not have relative displacement about guaranteeing, promote bone growth, wait for bioabsorbable screw to be absorbed the back by the human body, artificial intervertebral disc just can move about freely.
Furthermore, the artificial intervertebral disc of the utility model is provided with a bone plate made of the bio-absorbable material at the front side of the vertebral body, and more than two screw holes can provide screws made of the bio-absorbable material to lock into the bone plate. The bio-absorbable screw passes through the bone plate made of absorbable materials, the upper vertebra and the lower metal plate of the artificial intervertebral disc to achieve locking and fixing to the lower vertebra, so that the artificial intervertebral disc at the initial stage of implantation cannot move temporarily due to the fixation of the screw made of the bio-absorbable materials and the bone plate, the contact parts of the upper metal plate and the lower metal plate and the vertebral body are ensured not to have relative displacement, the bone growth is promoted, and the artificial intervertebral disc can move freely after the screw made of the bio-absorbable materials and the bone plate are absorbed by a human body.
Drawings
FIGS. 1A, 1B and 1C are schematic views of an embodiment of an artificial intervertebral disc of the present invention from different angles;
FIG. 1D is a schematic view of an embodiment of the artificial disc shown in FIGS. 1A-1C assembled to a vertebra;
FIG. 2A is a schematic view of another embodiment of an artificial intervertebral disc of the present disclosure; and
figure 2B is a schematic view of an embodiment of the artificial disc of figure 2A assembled to a vertebra.
Description of the symbols:
11 superior vertebra
12 lower vertebral body
2 upper metal plate
21 second screw hole
22 sixth screw hole
23 upper engaging teeth
3 buffer core
4 lower metal plate
41 third screw hole
42 fifth screw hole
43 lower engaging teeth
51 first fixing part
52 second fixing member
6 fixed plate
61 first screw hole
62 fourth screw hole
Detailed Description
In order to make the technical problems, technical solutions and advantages to be solved by the present invention clearer, the following detailed description will be given with reference to the accompanying drawings and specific embodiments.
Referring to fig. 1A to 1D, the artificial intervertebral disc includes an upper metal plate 2, a lower metal plate 4, a buffer core 3 disposed between the upper metal plate 2 and the lower metal plate 4, and a first fixing member 51 and a second fixing member 52.
The buffer core 3 is a plastic component, which simulates soft and elastic semi-fluid jelly like nucleus pulposus, and is filled between the upper metal plate 2 and the lower metal plate 4 to buffer external stress and impact. The buffer core 3 has a joint surface contacting the upper metal plate 2, and the upper metal plate 2 can move forward, backward, leftward, rightward, or rotate by the joint surface, and the buffer core 3 and the lower metal plate 4 are in a key combination relationship.
The first and second fixing members 51 and 52 are screws, and are made of a bio-absorbable material, and are absorbed by the human body after entering the human body for a certain period of time. As shown, the screw has a larger diameter top, a body with threads, and an end presenting a tip.
The upper metal plate 2 includes second screw holes 21 and sixth screw holes 22, and the lower metal plate 4 includes third screw holes 41 and fifth screw holes 42. The upper metal plate 2 is matched with the joint surface of the buffer core 3, one surface facing the buffer core 3 can be designed with an inward concave arc surface, and the lower metal plate 4 is matched with the bottom of the buffer core 3, one surface facing the buffer core 3 can be designed with a groove to accommodate the buffer core 3.
As shown in the figure, the second screw hole 21 is located at the corner of the upper metal plate 2, the third screw hole 41 is located at the offset corner of the lower metal plate 4, the second screw hole 21 and the third screw hole 41 can be passed by the first fixing member 51, wherein the top of the first fixing member 51 is designed with a groove to facilitate the rotation of the screw by the corresponding tool, and can pass through the upper metal plate 2 and the lower metal plate 4 by the screw thread of the body, and the design of the top of the first fixing member 51 with a larger diameter enables the first fixing member 51 not to be completely submerged into the upper metal plate 2, and enables the end portion presenting a tip end to be drilled into the vertebra. In addition, a recess may be designed around the second screw hole 21 to fit the second screw hole 21, so that the top of the first fixing member 51 can be slightly received when the first fixing member 51 is obliquely inserted into the upper metal plate 2. Furthermore, the first fixing member 51 may pass through the buffer core 3 and then pass through the third screw hole 41 of the lower metal plate 4, in addition to the second screw hole 21 of the upper metal plate 2 and the third screw hole 41 of the lower metal plate 4.
Similar to the above, as shown in the drawings, the fifth screw hole 42 is located at the corner of the lower metal plate 4, the sixth screw hole 22 is located at the offset corner of the upper metal plate 2, the fifth screw hole 42 and the sixth screw hole 22 can be passed by the second fixing member 52, wherein the top of the second fixing member 52 is designed with a groove to facilitate the rotation of the screw by the corresponding tool, and can pass through the lower metal plate 4 and the upper metal plate 2 by the screw thread of the body, and the design of the larger diameter of the top of the second fixing member 52 can make the second fixing member 52 not be completely submerged into the lower metal plate 4, but also make the end portion presenting a tip end capable of drilling into the vertebra. In addition, a groove may be designed around the fifth screw hole 42 to fit the fifth screw hole 42, so as to slightly accommodate the top of the second fixing member 52 when the second fixing member 52 is inserted obliquely into the lower metal plate 4.
As shown in the figure, the penetrating directions of the first fixing member 51 and the second fixing member 52 are staggered with each other.
The upper metal plate 2 and the lower metal plate 4 have upper engaging teeth 23 and lower engaging teeth 43 formed on their respective surfaces facing away from the cushion core 3. As shown, the upper engaging teeth 23 and the lower engaging teeth 43 may be disposed on the surfaces of the upper metal plate 2 and the lower metal plate 4 in an angular cone shape, and the shape and number thereof are not limited to the figure, and the upper engaging teeth 23 and the lower engaging teeth 43 may be used to assist the engagement with the upper and lower vertebrae when the artificial intervertebral disc is disposed between the upper and lower vertebrae.
When the artificial intervertebral disc is assembled to a vertebral body of a vertebral column, the first fixing member 51 sequentially passes through the second screw hole 21, the buffer core 3 and the third screw hole 41 of the lower metal plate 4 from the upper metal plate 2 and enters the lower vertebral body 12, such that the top of the first fixing member 51 is exposed out of the upper metal plate 2 and the end portion is embedded in the lower vertebral body 12. The second fixing member 52 sequentially passes through the fifth screw hole 42 and the sixth screw hole 22 of the upper metal plate 2 from the lower metal plate 4 to enter the upper vertebral body 11, such that the top of the second fixing member 52 is exposed out of the lower metal plate 4 and the end portion thereof is embedded in the upper vertebral body 11. At the initial stage of implantation, the artificial intervertebral disc is temporarily immobilized due to the fixation of the first and second anchors 51 and 52 of the bio-absorbable material, so that there is no relative displacement between the upper and lower metal plates 51 and 52 and the upper and lower vertebral bodies 11 and 12, thereby promoting bone growth, and the artificial intervertebral disc can move freely after the bio-absorbable material is absorbed by the human body.
Referring to fig. 2A and 2B, the artificial intervertebral disc of the present invention may further include a fixing plate 6, which is a bone plate made of a bio-absorbable material and is absorbed by the human body after entering the human body for a certain period of time. As shown, the fixation plate 6 spans the superior vertebral body 11 and the inferior vertebral body 12 to be attached to the anterior side of the superior vertebral body 11 and the inferior vertebral body 12.
The fixing plate 6 includes a first screw hole 61 and a fourth screw hole 62, the first fixing piece 51 passes through the first screw hole 61, the second screw hole 21 of the upper metal plate 2, and the third screw hole 41 of the lower metal plate 4 in order to enter the lower vertebral body 12, and the second fixing piece 52 passes through the fourth screw hole 62, the fifth screw hole 42 of the lower metal plate 4, and the sixth screw hole 22 of the upper metal plate 2 in order to enter the upper vertebral body 11. At the initial stage of implantation, the artificial intervertebral disc is temporarily disabled due to the fixation of the first and second fixing members 51 and 52 of the bio-absorbable material to the fixing plate 6, so that there is no relative displacement between the upper and lower metal plates 2 and 4 and the upper and lower vertebral bodies 11 and 12, thereby promoting bone growth, and the artificial intervertebral disc can move freely after the bio-absorbable material is absorbed by the human body.
To sum up, the utility model provides an artificial intervertebral disc, including upper and lower metal sheet and the buffering nuclear between the two, by respectively set up two or more screw holes at upper and lower metal sheet, and utilize the screw that constitutes with bioabsorbable material, a screw passes down the screw hole of metal sheet and penetrates centrum again as the entry by the screw hole of last metal sheet, another screw passes the screw hole of last metal sheet and penetrates last centrum again as the entry by the screw hole of metal sheet down, thereby fixed metal sheet about fixed and be fixed in on the vertebra with artificial intervertebral disc, more can add the hone lamella that constitutes with bioabsorbable material again in upper and lower vertebra the place ahead, let the screw pass through this before passing through upper and lower metal sheet earlier, this hone lamella can supply the locking of screw. Therefore, in the initial stage of implantation of the artificial intervertebral disc, the artificial intervertebral disc cannot move temporarily due to the fixation of the screws, so that the contact parts of the upper metal plate and the lower metal plate and the vertebral body cannot relatively move, and the growth of bones is promoted; the artificial intervertebral disc can move freely after the bioabsorbable materials forming the screws or the bone plates are absorbed by the human body.
The foregoing is a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of improvements and decorations can be made without departing from the principle of the present invention, and these improvements and decorations should also be regarded as the protection scope of the present invention.
Claims (10)
1. An artificial intervertebral disc for placement between an upper vertebral body and a lower vertebral body, comprising:
an upper metal plate for contacting the upper vertebral body;
a lower metal plate for contacting the lower vertebral body;
the buffer core is arranged between the upper metal plate and the lower metal plate; and
the first fixing piece penetrates through the upper metal plate and the lower metal plate and enters the lower vertebral body, and the second fixing piece penetrates through the lower metal plate and the upper metal plate and enters the upper vertebral body.
2. The prosthetic disc of claim 1, wherein said upper metal plate includes a second screw hole and said lower metal plate includes a third screw hole, said first fixation member passing through said second screw hole and said third screw hole in sequence into said lower vertebral body.
3. The prosthetic disc of claim 1, wherein said lower metal plate includes a fifth screw hole and said upper metal plate includes a sixth screw hole, said second fixation element passing through said fifth screw hole and said sixth screw hole in sequence into said superior vertebral body.
4. The prosthetic disc of claim 1, wherein the first and second anchors are screws comprised of a bioabsorbable material.
5. The artificial disc of claim 1 wherein the direction of penetration of the first fixing element is staggered with respect to the direction of penetration of the second fixing element.
6. The artificial disc of claim 1 further comprising a fixation plate, wherein the first fixation member is disposed through the fixation plate, the upper metal plate and the lower metal plate and into the lower vertebral body, and the second fixation member is disposed through the fixation plate, the lower metal plate and the upper metal plate and into the upper vertebral body.
7. The prosthetic disc of claim 6, wherein said fixation plate comprises a first screw hole, said upper metal plate comprises a second screw hole and said lower metal plate comprises a third screw hole, said first fixation element passing sequentially through said first screw hole, said second screw hole and said third screw hole to enter said lower vertebral body.
8. The prosthetic disc of claim 6, wherein said fixation plate includes a fourth screw hole, said lower metal plate includes a fifth screw hole and said upper metal plate includes a sixth screw hole, said second fixation element passing sequentially through said fourth screw hole, said fifth screw hole and said sixth screw hole to enter said superior vertebral body.
9. The artificial disc of claim 6 wherein the fixation plate spans across and attaches to the superior and inferior vertebral bodies.
10. The prosthetic intervertebral disc of claim 6, wherein said fixation plate is a bone plate comprised of a bioabsorbable material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920569397.4U CN210096002U (en) | 2019-04-24 | 2019-04-24 | Artificial intervertebral disc |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920569397.4U CN210096002U (en) | 2019-04-24 | 2019-04-24 | Artificial intervertebral disc |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210096002U true CN210096002U (en) | 2020-02-21 |
Family
ID=69538042
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920569397.4U Active CN210096002U (en) | 2019-04-24 | 2019-04-24 | Artificial intervertebral disc |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210096002U (en) |
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2019
- 2019-04-24 CN CN201920569397.4U patent/CN210096002U/en active Active
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