CN214387788U - Knee joint bone prosthesis - Google Patents
Knee joint bone prosthesis Download PDFInfo
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- CN214387788U CN214387788U CN202023212294.4U CN202023212294U CN214387788U CN 214387788 U CN214387788 U CN 214387788U CN 202023212294 U CN202023212294 U CN 202023212294U CN 214387788 U CN214387788 U CN 214387788U
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- knee joint
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Abstract
The invention provides a knee joint bone prosthesis, which comprises a base and a joint surface; the base comprises a pyramid and a bottom plate bone trabecula, the pyramid is fixedly arranged in the middle of the bone trabecula, and a pyramid barb structure is arranged at the bottom of the pyramid. The base has the barb structure, can organize with the barb structure of articular surface part, and barb structure edge has the oblique angle, is convenient for organize like this, makes two parts barb structure catch on each other, produces and has very strong resistance to plucking, can prevent effectively that articular surface and metal part from dislocating.
Description
Technical Field
The invention relates to a medical instrument, in particular to a knee joint bone prosthesis.
Background
Defects and injuries of articular cartilage in joints are common diseases in clinic, and a representative disease of articular cartilage injuries is osteoarthritis, and symptoms of osteoarthritis include: the most prominent symptoms are pain, mild dull pain in the initial stage, gradual worsening later, more active, and better after rest. Some patients feel pain in the morning and are relieved after slight activities, but the pain becomes worse after excessive activities, and persistent pain or night pain, also called resting pain, appears in the later period. Pain may be related to factors such as weather changes, cold, dampness; the joint is often felt to be inflexible and difficult to go upstairs and downstairs, the joint is fixed at a certain angle for a long time in the morning, the joint is stiff, and the joint is lightened after being slightly moved; when the joint moves, different sounds are generated, mainly caused by the damage of joint cartilage and the unevenness of joint surface; if the articular cartilage is stripped or falls into the joint cavity to form an episome, also called as an articular mouse, joint interlocking can occur at the moment; articular cartilage damage can lead to synovitis, the formation of fluid accumulation, and joint swelling.
The existing treatment modes comprise drilling, autologous living and allogeneic cartilage transplantation, chondrocyte transplantation and the like, but all the modes have the defects of limited repair capability, disease transmission, limited supply area, complicated steps, high cost and the like, and have many complications. At present, few internal plant materials specially used for articular cartilage defect and injury appear in clinic at home and abroad, and an internal plant capable of replacing articular cartilage surface to play a role is urgently needed for most of articular cartilage defect patients.
Therefore, there is an urgent need for a prosthesis having a low friction coefficient, which can maintain medical implants in the body for a long period of time to replace the defective cartilage.
Disclosure of Invention
The invention aims to provide a knee joint bone prosthesis.
In order to solve the technical problems, the invention provides a knee joint bone prosthesis, which comprises a base and a joint surface; the base comprises a pyramid and a bottom plate trabecula, the pyramid is fixedly arranged in the middle of the trabecula, a pyramid barb structure is arranged at the bottom of the pyramid, the bottom of the barb structure is of a rectangular structure, the middle of the barb structure is of an inverted trapezoidal structure, the upper part of the barb structure is of a trapezoidal structure with an edge oblique angle, and the length of the bottom side of the trapezoidal structure with the edge oblique angle at the upper part is greater than that of the top side of the inverted trapezoidal structure at the middle part; the base is provided with a base barb structure matched with the pyramid barb structure.
Furthermore, the base is made of metal, and the joint surface part is made of high polymer polyethylene material or ceramic alloy.
Furthermore, the pyramid surface is provided with a pyramid bone trabecula structure.
Furthermore, the grid porosity of the bottom plate bone trabecula and the pyramid bone trabecula structure is set to be 50% -80%, and the pore diameter is set to be 100-400 mu m.
Further, the articular surface portion is arc-shaped.
Further, the pyramid is a rectangular pyramid, and the height of the rectangular pyramid structure is 8-15 mm.
Furthermore, the bevel angles of the upper edges of the pyramid barb structure and the articular surface barb structure are 40-45 degrees.
During the use, pass through barb structure combination with base and articular surface: specifically, the pyramid structure enters the bone through knocking, the pyramid structure can better resist rotation, and the stability of the cartilage prosthesis is improved.
Compared with the prior art, the invention has the following advantages:
(1) the surface of the pyramid structure is provided with a layer of bone trabecula structure, so that the growth of bone substances can be promoted, and the stability in the later period can be improved.
(2) Meanwhile, the thickness of the bottom plate bone trabecula structure is selected according to the thickness of the bone removal, so that the contact area between the prosthesis and the bone is increased, the stability of the prosthesis at the later stage is further increased, the bottom plate bone trabecula and the pyramid are integrated, and the three-dimensional (3D) printing process is adopted for realizing the structure.
(3) The base has the barb structure, can organize with the barb structure of articular surface part, and barb structure edge has the oblique angle, is convenient for organize like this, makes two parts barb structure catch on each other, produces and has very strong resistance to plucking, can prevent effectively that articular surface and metal part from dislocating.
(4) The articular surface part is designed according to the physiological radian of the thighbone and the shinbone of a patient, and the articular surface part is designed by extracting the bone surface through CT data of the patient by using a software mimics reverse principle, so that the articular surface part accurately conforms to the physiological radian of the cartilage of the patient and does not conflict with the radian of the articular surface around a normal knee joint, the repaired cartilage articular surface of the patient achieves a smooth effect, and the pain of the patient is reduced;
(5) this knee joint bone prosthesis adopts 3D printing technique, therefore cartilage prosthesis can be based on the defective size of each patient, customizes to satisfy each patient's demand, increase application range is big.
Drawings
FIG. 1 is a front view of the overall structure of the knee joint bone prosthesis of the present invention;
FIG. 2 is a top view of the overall structure of the knee joint bone prosthesis of the present invention;
FIG. 3 is a front view of the knee joint bone prosthesis base of the present invention;
FIG. 4 is a front view of the articular surface of the knee joint prosthesis of the present invention;
1-base, 2-articular surface, 11-pyramid barb structure; 12-pyramid, 13-trabecular bone; 21-articular surface barb structure.
Detailed Description
In order to make the technical solution of the present invention better understood by those skilled in the art, a knee joint bone prosthesis of the present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
Comprises a base and an articular surface; the base comprises a pyramid 12 and a bottom plate bone trabecula 13, the pyramid 12 is fixedly arranged in the middle of the bottom plate bone trabecula 13, a pyramid barb structure 11 is arranged at the bottom of the pyramid 12, the bottom of the pyramid barb structure penetrates through the bottom plate bone trabecula, the bottom of the pyramid barb structure 11 is of a rectangular structure, the middle of the pyramid barb structure is of an inverted trapezoidal structure, the upper part of the pyramid barb structure is of a trapezoidal structure with an edge oblique angle, and the length of the bottom side of the trapezoidal structure with the edge oblique angle at the upper part is greater than that of the top side of the inverted trapezoidal structure at the middle part; the articular surface is provided with an articular surface barb structure 21 matched with the pyramid barb structure. Wherein the grid porosity of the bottom plate bone trabecula is set to be 50% -80%, and the pore diameter is set to be 100-400 μm. The pyramid is a rectangular pyramid, and the height of the rectangular pyramid structure is 8-15 mm. The bevel angles of the upper edges of the pyramid barb structure and the articular surface barb structure are 40-45 degrees. Through pyramid structure barb structure, can carry out the matched stack with articular surface barb structure, barb structure edge has the oblique angle, is convenient for like this assemble stack, makes two parts barb structure catch on each other, produces to have very strong resistance to plucking power, can prevent effectively that articular surface and metal part from dislocating.
The metal base is made of metal with mechanical strength, and the joint surface is made of high-molecular polyethylene or ceramic alloy with low friction coefficient.
In order to facilitate bone ingrowth, a layer of pyramid trabecular bone structure is arranged on the surface of the pyramid structure to increase the stability in the later period, wherein the grid porosity of the pyramid trabecular bone structure is set to be 50% -80%, and the pore diameter is set to be 100-400 microns.
The method comprises the steps of extracting the surface of a bone to design an articular surface part by utilizing the software mimics reverse principle through CT data of a patient, and setting the articular surface part into an arc shape. The radian of the cartilage of the patient can be accurately met, and the conflict with the radian of the joint surface around the normal knee joint can be avoided, so that the repaired cartilage joint surface can achieve the smooth effect, and the pain of the patient can be reduced.
Wherein, the thickness that bottom plate bone trabecula structure removed according to the sclerotin in the bottom plate bone trabecula structure class, the thickness of selecting bottom plate bone trabecula structure to increase false body and sclerotin area of contact, further increase the stability of false body later stage, and bottom plate bone trabecula and pyramid are a whole. This knee joint bone prosthesis adopts 3D printing technique, therefore cartilage prosthesis can be based on the defective size of each patient, customizes to satisfy each patient's demand, increase application range is big.
During the use, pass through barb structure combination with base and articular surface: specifically, the pyramid structure enters the bone through knocking, the pyramid structure can better resist rotation, and the stability of the cartilage prosthesis is improved.
It will be understood that the above embodiments are merely exemplary embodiments taken to illustrate the principles of the present invention, which is not limited thereto. It will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the spirit and scope of the invention, and these modifications and improvements are also considered to be within the scope of the invention.
Claims (5)
1. A knee joint bone prosthesis is characterized by comprising a base and a joint surface; wherein the base includes pyramid and bottom plate bone trabecula, and the pyramid is fixed to be set up in bone trabecula intermediate position, and the pyramid bottom is provided with pyramid barb structure, be provided with on the base with the base barb structure of pyramid barb structure adaptation, articular surface is the arc, and the pyramid is the rectangular pyramid.
2. The knee joint bone prosthesis according to claim 1, wherein: the base is made of metal, and the joint surface part is made of high-molecular polyethylene material or ceramic alloy.
3. The knee joint bone prosthesis according to claim 1, wherein: the pyramid surface is provided with a pyramid bone trabecula structure.
4. The knee joint bone prosthesis according to claim 1, wherein: the bottom plate bone trabecula and the pyramid bone trabecula are both of grid porosity of 50% -80%, and the pore diameter is set to be 100-400 mu m.
5. The knee joint bone prosthesis according to claim 1, wherein: the bevel angles of the upper edges of the pyramid barb structure and the articular surface barb structure are 40-45 degrees.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023212294.4U CN214387788U (en) | 2020-12-28 | 2020-12-28 | Knee joint bone prosthesis |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023212294.4U CN214387788U (en) | 2020-12-28 | 2020-12-28 | Knee joint bone prosthesis |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214387788U true CN214387788U (en) | 2021-10-15 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202023212294.4U Active CN214387788U (en) | 2020-12-28 | 2020-12-28 | Knee joint bone prosthesis |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN214387788U (en) |
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2020
- 2020-12-28 CN CN202023212294.4U patent/CN214387788U/en active Active
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