CN211188443U

CN211188443U - Metal and ceramic composite joint prosthesis

Info

Publication number: CN211188443U
Application number: CN201921853844.5U
Authority: CN
Inventors: 张卫平
Original assignee: Beijing AK Medical Co Ltd
Current assignee: Beijing AK Medical Co Ltd
Priority date: 2019-10-31
Filing date: 2019-10-31
Publication date: 2020-08-07
Anticipated expiration: 2029-10-31

Abstract

The utility model discloses a metal and ceramic complex joint prosthesis, including the metal body and ceramic body, metal body integrated into one piece makes, including porous structure layer, boundary layer and root form layer, the boundary layer is in between porous structure layer and the root form layer, and the root form layer includes that a plurality of connects the root form silk cluster of each other contactless on the boundary layer, and root form silk cluster includes the main root of being connected perpendicularly with the boundary layer and connects a plurality of fibrous roots in main root side, and the fibrous root extends to keeping away from boundary layer side slope, and the ceramic body covers root form silk cluster and shaping on the boundary layer. The joint prosthesis realizes the composition of metal and ceramic, and meets the requirements of a wear-resistant ceramic body required by a joint friction surface and a porous metal structure with a good bone ingrowth effect required by a bone integration surface. The root-shaped silk clusters on the root-shaped layer are planted in the ceramic body, so that the ceramic body and the metal body are connected tightly and stably, and the root-shaped clusters are not in contact with each other, so that the ceramic body is prevented from being cracked or cracked locally.

Description

Metal and ceramic composite joint prosthesis

Technical Field

The utility model belongs to the technical field of orthopedic implant and specifically relates to a joint prosthesis of metal and ceramic complex.

Background

At present, an implant product of an artificial joint replacement operation generally has two very important surfaces, namely a joint friction surface and an osseointegration interface, and as each joint friction surface is in contact friction with the opposite joint friction surface forming a joint friction pair, the implant product needs to have good friction performance including enough hardness and toughness, low wear rate, good lubricating performance, deformation-resistant strength and the like so as to meet the functional requirements, and the ceramic interface is generally accepted in the industry at present as the joint friction surface on the single side or even on the two sides of the friction pair to effectively reduce the wear of the joint surface; the bone integration interface is the interface of the implant and the human skeleton, and the research in recent years shows that the porous metal surface has good bone growth effect, so that the bone cell tissue of the human body is easy to grow into the pores in the porous material, thereby achieving the effective fusion between the bone tissue and the porous metal and firmly fixing the implant and the human skeleton.

Because the ceramic material is difficult to be made into a porous structure and cannot realize the growth of bone cells, the joint friction surface made of the metal material cannot achieve the excellent wear resistance of the ceramic material. However, the current products are all made of a single material, and therefore, there is a need for a product that integrates the ceramic articular friction surface and the porous metal osseointegration interface into the same implant.

SUMMERY OF THE UTILITY MODEL

Problem to prior art existence, the utility model aims to provide a metal and ceramic complex joint prosthesis integrates a joint prosthesis with ceramic joint friction surface and porous metal's osseointegration interface on, has both reduced the wearing and tearing of joint friction surface and can guarantee good bone again and grow into the effect.

In order to achieve the above purpose, the technical scheme of the utility model is as follows:

the utility model provides a metal and ceramic composite's joint prosthesis, includes the metal body and ceramic body, metal body integrated into one piece makes, including porous structure layer, boundary layer and root form layer, the boundary layer be in porous structure layer with between the root form layer, root form layer includes that a plurality of connects root form silk cluster that each other is contactless on the boundary layer, root form silk cluster include with the perpendicular main root of connecting of boundary layer with connect in a plurality of fibrous roots of main root side, the fibrous root is to keeping away from the slope of boundary layer side is extended, the ceramic body covers root form silk cluster and shaping are in on the boundary layer.

Furthermore, the connection part of the fibrous root and the main root is close to the connection part of the main root and the boundary layer.

Furthermore, the boundary layer is of a plate-shaped structure, and a plurality of root-shaped clusters are regularly connected to the surface of the boundary layer.

Furthermore, a plurality of grooves which are regularly arranged are arranged on the plate-shaped structure, supporting walls are formed between the adjacent grooves, and the root-shaped silk clusters are connected with the upper surfaces of the intersection parts of the different supporting walls.

Further, a plurality of regularly arranged strip-shaped reinforcing ribs are arranged on the plate-shaped structure, and the root-shaped filament clusters are connected to the upper surfaces of the reinforcing ribs at equal intervals.

Furthermore, the metal body is made of tantalum metal or tantalum alloy.

Further, the ceramic body is made of alumina-based ceramic, zirconia-based ceramic or silicon carbide-based ceramic.

Further, the included angle between the fibrous root and the axis of the main root is less than or equal to 45 degrees.

Further, the diameters of the main root and the fibrous root are both 0.1-2 mm.

Furthermore, the connecting lines of three adjacent root-shaped silk clusters which are closest to each other in the projection center of the boundary layer form an equilateral triangle.

The utility model discloses a metal and ceramic composite's joint prosthesis in a joint prosthesis's product, realizes metal and ceramic complex, has both satisfied the required wear-resisting ceramic body of joint friction surface and has satisfied the required porous metal structure that has good bone growth income effect of bone integration face again. The root-shaped silk clusters on the root-shaped layer are planted in the ceramic body, so that the ceramic body and the metal body are connected tightly and stably, and the root-shaped clusters are not in contact with each other, so that the problem that the contact between the root-shaped silk clusters isolates the local part of the ceramic body to generate stress concentration inside the ceramic body in the cooling process after the joint prosthesis product is fired is avoided, and the local part of the ceramic body is prevented from being cracked or cracked.

Drawings

FIG. 1 is a schematic view of a single root cluster attached to a metal body in an example of the present invention;

FIG. 2 is a schematic cross-sectional view of FIG. 1;

FIG. 3 is a schematic structural view of a metal body in an example of the present invention;

FIG. 4 is a top view of FIG. 3;

fig. 5 is a schematic structural diagram of an example of the present invention;

fig. 6 is a schematic view of an exemplary molding process of the present invention;

fig. 7 is a schematic diagram of an exemplary molding of the present invention;

fig. 8 is a schematic structural view of a second interface layer in an example of the present invention;

FIG. 9 is a schematic structural view of a third interface layer in an example of the present invention;

FIG. 10 is a schematic structural view of a fourth interface layer in an example of the present invention;

fig. 11 is a schematic diagram of a first application example of the present invention;

fig. 12 is a schematic view of a second application example of the present invention;

in the figure:

1. a root-like layer; 1-1, a main root; 1-2, fibrous root;

2. an interface layer; 2-1, a groove; 2-2, a support wall; 2-3, reinforcing ribs;

3. a porous structural layer; 4. a ceramic body; 5. forming a mold; 6. a hip ball prosthesis; 7. a hip acetabular cup prosthesis; 8. a human femur; 9. a knee joint femoral condyle prosthesis; 10. a knee joint spacer; 11. knee joint tibial plateau prosthesis.

Detailed Description

To clearly illustrate the design concept of the present invention, the following description is made with reference to the examples.

In order to make the technical solutions of the present invention better understood by those skilled in the art, the technical solutions in the examples of the present invention are clearly and completely described below with reference to the drawings in the examples of the present invention, and it is obvious that the described examples are only a part of examples of the present invention, and not all examples. Based on the middle examples of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

In the description of the present embodiment, the terms "upper", "lower", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention.

The example as shown in fig. 1-7 provides a metal and ceramic composite prosthesis of the utility model includes metal body and ceramic body 4, and metal body integrated into one piece makes, including porous structure layer 3, boundary layer 2 and root form layer 1, boundary layer 2 is in between porous structure layer 3 and root form layer 1, root form layer 1 includes that a plurality of connects the root form silk cluster that does not contact each other on the boundary layer, and root form silk cluster includes main root 1-1 of being connected perpendicularly with the boundary layer and connects a plurality of fibrous root 1-2 in main root side, and fibrous root 1-2 is to keeping away from boundary layer side slope extension, and ceramic body 4 covers root form silk cluster and shaping on boundary layer 2.

The metal and ceramic composite joint prosthesis of the present example realizes the composition of metal and ceramic in one joint prosthesis product, and satisfies both the wear-resistant ceramic body 4 required for the joint friction surface and the porous metal structure 3 with good bone ingrowth effect required for the osseointegration surface. The root-shaped silk clusters of the root-shaped layer 1 are planted in the ceramic body 4, so that the ceramic body 4 and the metal body are connected tightly and stably, and the root-shaped clusters are not in contact with each other, so that the problem that the contact between the root-shaped silk clusters locally isolates the ceramic body 4 to generate internal stress concentration of the ceramic body 4 in the cooling process of the joint prosthesis product after the ceramic body 4 is sintered is avoided, and the ceramic body 4 is prevented from being cracked or cracked locally.

The metal body in the example can be obtained by methods such as 3D printing, metal particle sintering, high-temperature spraying and the like, the material of the metal body is tantalum metal or tantalum alloy, the metal body is selected according to the use requirement and the application cost of the joint, and the pore diameter of the porous structure layer 3 is 50-1200 microns. The ceramic body in this example may be alumina-based ceramic, zirconia-based ceramic, silicon carbide-based ceramic, or other ceramic materials that meet the requirements of medical implants.

As shown in FIGS. 6 and 7, the ceramic body 4 is formed on the boundary layer by covering the root-shaped filament bundle with the ceramic body 4 by the ceramic blank powder, the root-shaped filament bundle and the ceramic body 4 are deformed to different degrees due to the difference of the thermal expansion coefficients during the sintering of the ceramic body 4, when the root-shaped filament bundle and the ceramic body 4 generate internal stress, the root-shaped filament bundle can adapt to the deformation of the ceramic body 4 by the deformation of the root-shaped filament bundle and the tantalum metal or the tantalum alloy, so as to reduce the internal stress, and the root-shaped filament bundle and the ceramic body 4 can be more tightly combined, in this example, the material of the ceramic body 4 is alumina-based ceramic, zirconia-based ceramic or silicon carbide-based ceramic, which is selected because the material has a very similar thermal expansion coefficient to the tantalum, wherein the thermal expansion coefficient of the alumina ceramic is 7.5 × 10^-6Per DEG C, the coefficient of thermal expansion of zirconia is 9.6 × 10^-6/Silicon carbide having a coefficient of thermal expansion of 4.7 × 10 DEG C^-6Per DEG C, the thermal expansion coefficient of tantalum metal is 6.6 × 10^-6The temperature per DEG C enables the ceramic body 4 and the root-shaped filament cluster to have similar thermal expansion conditions, and in addition, the melting point of tantalum metal is as high as 2995 ℃, which is far higher than the sintering temperature of the ceramic, so that unnecessary internal stress can not be generated by the ceramic body 4 and the root-shaped filament cluster due to too large thermal expansion coefficient difference in the sintering process, and the root-shaped filament cluster and the ceramic body 4 can be further enabled to be combined more tightly.

As shown in FIG. 1, the connection part of the fibrous root 1-2 and the main root 1-1 is close to the connection part of the main root 1-1 and the boundary layer 2, so that the fibrous root 1-2 can be more firmly connected to the main root 1-1. As shown in FIG. 2, the included angle α between the fibrous root 1-2 and the axis of the main root 1-1 is less than or equal to 45 degrees, in the example, α is 30 degrees, and excessive tensile stress or compressive stress can not be generated on the ceramic body between the fibrous root 1-2 and the boundary layer 2 in the sintering and forming process of the ceramic body 4.

As shown in fig. 5, the boundary layer 2 in this example has a plate-like structure, and a plurality of root-like clusters are regularly connected to the surface of the boundary layer 2.

Three root-shaped silk clusters which are adjacent to each other and closest to each other form an equilateral triangle on the connecting line of the projection center of the boundary layer, as shown in fig. 3 and 4, the vertical distances between the root-shaped silk clusters of adjacent horizontal rows are equal, the root-shaped silk clusters of different horizontal rows are arranged at intervals, and the distances between the adjacent root-shaped silk clusters are equal. This arrangement of the root tufts allows the root tufts to be uniformly distributed within the ceramic body 4 and the spacing between adjacent root tufts in each direction within the ceramic body 4 to be equal, allowing the root tufts to more uniformly bear the load.

The diameters of the main root 1-1 and the fibrous root 1-2 are 0.1-2 mm.

The boundary layer 2 in this example may be a flat plate structure as shown in fig. 5, or may be a structure as shown in fig. 8, that is, a plurality of regularly arranged grooves 2-1 are arranged on the plate-shaped structure shown in fig. 5, support walls 2-2 are formed between adjacent grooves, and the root-shaped filament clusters connect the upper surfaces of the intersections of different support walls 2-2. As shown in fig. 8, the groove 2-1 is a groove with a cubic structure, when the groove is formed, the thickness of the bottom wall of the groove needs to be ensured to meet the strength requirement, and the root-shaped filament clusters are connected to the intersected upper surfaces of the four mutually perpendicular supporting walls 2-2. The strength of the boundary layer 2 can be enhanced through the arrangement of the supporting walls 2-2, the root-shaped filament clusters are connected to the upper surfaces of the intersection positions of the different supporting walls 2-2, the connection strength of the root-shaped filament clusters and the boundary layer 2 is guaranteed, the thickness of each supporting wall 2-2 is 0.1-3 mm, and the height of each supporting wall is 0.25-2.5 mm.

In this example, the spatial configuration of the grooves 2-1 is not limited to a cubic structure, but may be other shapes such as a cylindrical shape, a prismatic shape, and other irregular three-dimensional shapes, and the grooves 2-1 of the boundary layer in fig. 9 are triangular prism-shaped.

In this example, the interface layer 2 may also be a structure as shown in fig. 10, in which a plurality of regularly arranged strip-shaped reinforcing ribs 2-3 are disposed on a plate-shaped structure, and root-shaped filament clusters are connected to the upper surfaces of the reinforcing ribs 2-3 at equal intervals. As shown in FIG. 9, two reinforcing ribs 2-3 which are mutually perpendicular and intersected in each direction are arranged on the boundary layer, a plurality of reinforcing ribs are arranged in each direction, root-shaped clusters are connected to the upper surfaces of the reinforcing ribs 2-3 at equal intervals, the thickness of each reinforcing rib 2-3 is 0.1-3 mm, and the height of each reinforcing rib 2-3 is 0.25-2.5 mm.

The utility model discloses a boundary layer can also set up the structure that two kinds of at least wherein combine together of layer flat board, recess and strengthening rib according to the consideration in the aspect of patient's bone bed shape and biomechanics with the boundary layer.

In the joint prosthesis in the example, the porous structure layer is connected with the human skeleton, so that the human skeleton can easily grow into the porous structure layer, the joint prosthesis can be biologically fixed, and the aim of more firmly fixing the joint prosthesis is fulfilled. The joint prosthesis of metal and ceramic composite in this example may be applied to various types of artificial joints, such as hip joint prostheses, knee joint prostheses, shoulder joint prostheses, ankle joint prostheses, temporomandibular joint prostheses, elbow joint prostheses, wrist joint prostheses, and the like. Two examples of the joint prosthesis application of the above structure in this example are provided as shown in fig. 11 and 12, fig. 11 is a schematic view of a hip joint prosthesis, fig. 12 is a schematic view of a knee joint prosthesis, wherein the interface layer 2 of the knee joint tibial plateau prosthesis in fig. 12 is a plane structure, and the rest part of the joint prosthesis is a curved structure, and when the joint prosthesis is manufactured, the interface layer 2 of the metal body can be made into a curved plate-shaped structure as shown in the hip joint acetabular cup prosthesis 7 in fig. 11, and the interface layer 2 can be made into a structure schematic view of the plane plate which is bent for multiple times as shown in the hip joint ball prosthesis 6 and the knee joint femoral condyle prosthesis 9 in fig. 11, and the two structures of the interface layer 2 have the condition that the axes of the root-shaped silk cluster intersect, and the root-shaped silk cluster can be combined with the ceramic body 4 more firmly, especially when the interface layer 2 is the curved plate-shaped structure, the root-shaped silk tufts and the ceramic body 4 are better combined, the ceramic body 4 and the root-shaped silk tufts cannot generate relative displacement to cause internal abrasion of the ceramic body 4, most of joint prostheses are curved, and a boundary layer is required to be one of the two structures, so that the joint prosthesis in the example has longer service life.

It is noted that some of the structures may be selected differently than the specific examples given above. These are all made by those skilled in the art based on their basic skills based on understanding the idea of the present invention, and are not illustrated herein.

Finally, it is to be understood that the above embodiments are merely exemplary embodiments that have been employed to illustrate the principles of the present invention, and that the present invention is not limited thereto. It will be apparent to those skilled in the art that various changes and modifications can be made without departing from the spirit and scope of the invention, and these changes and modifications are to be considered as the protection scope of the invention.

Claims

1. The utility model provides a joint prosthesis that metal and pottery are compound, its characterized in that includes the metal body and ceramic body, metal body integrated into one piece makes, including porous structure layer, boundary layer and root form layer, the boundary layer be in porous structure layer with between the root form layer, root form layer includes that a plurality of connects the root form silk cluster that does not contact each other on the boundary layer, root form silk cluster include with the perpendicular main root of connecting of boundary layer with connect in a plurality of fibrous roots of main root side, the fibrous root to keeping away from the slope of boundary layer side extends, the ceramic body covers root form silk cluster and shaping are in on the boundary layer.

2. The joint prosthesis of claim 1, wherein the location of the connection of the fibrous root to the primary root is proximate the connection of the primary root to the interface layer.

3. The joint prosthesis of claim 1, wherein the boundary layer is a plate-like structure, and a plurality of the root-like clusters are regularly connected to the surface of the boundary layer.

4. A joint prosthesis according to claim 3, wherein the plate-like structure is provided with a plurality of regularly arranged grooves, support walls being formed between adjacent grooves, and the root tufts connect the upper surfaces of the intersections of the different support walls.

5. The joint prosthesis of claim 3, wherein the plate-shaped structure is provided with a plurality of regularly arranged strip-shaped reinforcing ribs, and the root-shaped filament bundles are connected to the upper surfaces of the reinforcing ribs at equal intervals.

6. The joint prosthesis of claim 1, wherein the metal body is tantalum metal or a tantalum alloy.

7. The joint prosthesis of claim 1, wherein the ceramic body is an alumina-based ceramic, a zirconia-based ceramic, or a silicon carbide-based ceramic.

8. The joint prosthesis of claim 1, wherein the angle between the fibrous root and the primary root axis is less than or equal to 45 °.

9. The joint prosthesis of claim 1, wherein the main root and the fibrous root each have a diameter of 0.1-2 mm.

10. The joint prosthesis of claim 1, wherein the connection lines of the three adjacent and nearest root-like filament tufts in the projection center of the boundary layer form an equilateral triangle.