CN218899820U - Gold-porcelain combined joint replacement prosthesis - Google Patents

Abstract

The utility model discloses a gold-porcelain combined joint replacement prosthesis, which is fixed by matching a fixing nail and a marrow cavity without using bone cement, so as to avoid adverse reaction caused by the bone cement, and comprises the following components: the articular surface, bone platform installs in the proximal art of tibia surface after the osteotomy, and the articular surface installs in the distal art of femur surface after the osteotomy, and the bearing surface of articular surface is arranged in the glenoid, and the bearing surface of articular surface and glenoid all are coated with the ceramic layer, and the surface after 3D prints is comparatively coarse, and the ceramic particle of deposit can form the gold porcelain interface that is connected more stably with the metal surface, is difficult for peeling off, has better wearability simultaneously for the metal.

Description

Gold-porcelain combined joint replacement prosthesis

Technical Field

The utility model belongs to the field of medical appliances, and particularly relates to a gold-porcelain combined joint replacement prosthesis.

Background

The joints of the human body belong to a non-strict type of hinge joint and are mainly characterized in that: the activities mainly include bending and stretching, and also do certain rotation motion along the longitudinal axis to bear the human body for walking-related activities; unlike other tissues, cartilage in the joint is only metabolized and cannot be regenerated; that is, once the articular cartilage is injured or aged, new cartilage is not grown to repair, but is denatured, lose elasticity and luster, and even fall off, and in the field of modern joint surgery, artificial knee joint replacement is a common operation for treating a knee joint disorder, and a key component required in the operation process is a knee joint prosthesis. The traditional artificial knee joint consists of a metal joint surface, a tibia platform and a high polymer cushion block, and is fixedly connected onto human bones by bone cement, the bone cement has the advantage of rapid solidification, a patient can move downwards in the early stage of operation, but the bone cement is different from the human bones, after a period of use, the fixing effect is reduced, the prosthesis is easy to loosen, and the secondary operation is needed to be adjusted at the moment.

Disclosure of Invention

The utility model discloses a gold-porcelain combined joint replacement prosthesis, which is fixed by matching a fixing nail and a marrow cavity without using bone cement, so that adverse reaction caused by the bone cement is avoided, and the porous structure on the surface of the fixing nail is convenient for bone ingrowth, so that the bone replacement prosthesis is fully combined with bone to further improve stability, and the problem of later loosening of the prosthesis is effectively avoided; in addition, the bearing surface structure formed by combining metal and ceramic greatly improves the wear resistance.

The utility model discloses a gold-porcelain combined joint replacement prosthesis, which comprises: the bone plate is arranged on the surface of the tibia after the bone cutting in the proximal operation, the joint surface is arranged on the surface of the femur after the bone cutting in the distal operation, and the bearing surface of the joint surface is arranged in a joint pit arranged on the top surface of the bone plate; the articular surface includes: the joint surface is a curved surface connected with the femur distal end osteotomy surface, and the other side surface is a bearing surface; the bearing surface of the joint surface is positioned in a joint nest of the bone platform, the bearing surface and the joint nest are coated with ceramic layers, and the bone platform is fixed to the surface of the tibia after osteotomy in proximal tibia operation through a rod piece arranged on the bottom surface of the bone platform;

further, the contact surface is a porous contact surface provided with a fixing pile, and the fixing pile is driven into the osteotomy surface of the distal end of the femur in operation to fix the joint surface.

Further, the joint surface and the bone platform are molded by using a 3D printing technology and are porous structures.

Further, the porosity of the porous structure is greater near the contact surface than near the load bearing surface.

Further, the porous structure is a bone-like trabecular structure.

Further, the porous structure is a three-dimensional grid structure of a regular dodecahedron structure.

The utility model has at least the following beneficial effects:

the joint surface is formed by utilizing a 3D printing technology, the contact surface is of a porous structure, the porosity of the joint surface is smaller when the joint surface is closer to a bearing surface, so that a gradient structure is formed, and compared with traditional solid casting, the elastic modulus of the gradient structure built by the porous structure is closer to that of human bones, so that the generation of stress shielding is avoided, and the quality is effectively reduced.

The traditional gasket structure is canceled, and a ceramic layer is combined on the bearing surface of the joint surface, so that the gold-ceramic combined composite structure can remarkably improve the wear resistance and optimize the product structure.

The fixed needle at the bottom of the bone platform is matched and fixed with the marrow cavity, bone cement is not used, and the porous structure outside the bone platform can also realize bone ingrowth, so that the stability is further improved, and the later loosening and even failure of the prosthesis are avoided.

The 3d printing technology is adopted for molding, so that the physiological characteristics of a patient can be matched, the prognosis is good, compared with the traditional joint prosthesis, the number of components is less, and looseness can not occur between the components.

Drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present utility model, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.

FIG. 1 schematically illustrates a structural schematic of the present utility model;

FIG. 2 schematically shows a schematic structural view of the portion A in FIG. 1;

FIG. 3 schematically illustrates a schematic structural view of a joint surface;

FIG. 4 schematically illustrates a structural schematic of a bone platform;

in the figure:

the joint surface, the 11-contact surface, the 12-bearing surface and the 13-fixed pile;

bone platform, 21-glenoid; 3-bar.

Description of the embodiments

For a clearer understanding of technical features, objects and effects of the present utility model, a detailed description of embodiments of the present utility model will be made with reference to the accompanying drawings. In the following description, it should be understood that the directions or positional relationships indicated by "front", "rear", "upper", "lower", "left", "right", "longitudinal", "transverse", "vertical", "horizontal", "top", "bottom", "inner", "outer", "head", "tail", etc. are configured and operated in specific directions based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present utility model, and do not indicate that the apparatus or element to be referred to must have specific directions, and thus should not be construed as limiting the present utility model. It should also be noted that unless explicitly stated or limited otherwise, terms such as "mounted," "connected," "secured," "disposed," and the like are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. When an element is referred to as being "on" or "under" another element, it can be "directly" or "indirectly" on the other element or one or more intervening elements may also be present. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

Examples

For convenience of description, this embodiment will be described by taking a knee replacement prosthesis used in total knee replacement as an example, and as shown in fig. 1, the replacement prosthesis includes: the articular surface 1 and the bone platform 2, the bone platform 2 is arranged on the surface after osteotomy in the proximal tibia, the articular surface 1 is arranged on the surface after osteotomy in the distal femur, and the bearing surface 12 of the articular surface 1 is arranged in the joint socket 21 on the top surface of the bone platform 2, which is consistent with the anatomically executed movement of the joint under non-pathological normal conditions, so as to execute the joint function.

The shape of the joint surface 1 is the same as the shape of the joint surface of the femoral condyle, as shown in fig. 3, the contact surface 11 is a curved surface on one side of the joint surface 1 connected with the osteotomy surface of the distal femur, the surface on the other side is a bearing surface 12, a fixing pile 13 is arranged on the contact surface 11, and the fixing pile 13 is driven into the osteotomy surface of the distal femur in operation to fix the joint surface 1.

The replacement prosthesis is molded by utilizing a 3D printing technology, so that the shape of the joint surface 1 is completely matched with the shape of the original joint of a patient, otherwise, the problems of influence on the treatment effect such as line deviation and the like are easily generated after implantation; meanwhile, due to the fact that the bone cutting amount is large in a patient needing total knee replacement therapy, the positions of the femur cut in the operation are not identical according to different conditions of the patient, the formed cross-sectional shapes are different, the 3D printing technology is utilized for forming, the shape of the contact surface 11 of the joint surface 1 can be matched with the cross-sectional shape after bone cutting, after the joint surface 1 is fixed with the distal femur, the contact surface 11 can be fully contacted with the cross-section of the femur to bear a part of stress, the stress is not limited to the fixing piles 13, the stress concentration of the fixing piles 13 is avoided, and the joint surface cannot loosen even after long-term use.

Furthermore, the contact surface 11 is a porous structure, which creates conditions for later bone ingrowth, and bone tissue will grow inward into the porous structure, achieving a more stable connection, further maintaining stability after long-term implantation.

Notably, the porosity of the portion near the contact surface 11 is greater than the porosity of the portion near the bearing surface 12, so that a gradient structure is formed in which the porosity gradually decreases from the contact surface 11 to the bearing surface 12, the mass is effectively reduced compared with solid casting, the elastic modulus of the porous structure is closer to that of human bone, and the outermost layer of the bearing surface 12 is a non-porous solid surface, so that the subsequent ceramic layer is convenient to attach.

As shown in fig. 4, the top surface of the bone platform 2 is provided with a socket 21, and in use, the load bearing surface 12 of the articular surface 1 is located in the socket 21; the joint prosthesis in the prior art is matched with the cushion block made of the wear-resistant material for use, but the complexity of the operation is increased, in the present disclosure, the similar components of the cushion block are not arranged, and the joint prosthesis is realized by the bone platform 2 with the gold-ceramic bonding interface, so that the complexity of the structure is reduced, and the operation steps are simplified.

It should be noted that: the bearing surface 12 and the joint socket 21 are coated with ceramic layers, the surface after 3D printing is relatively rough, deposited ceramic particles can form a gold-ceramic interface which is more stable in connection with the metal surface, the ceramic particles are not easy to peel off, and meanwhile, the ceramic particles have better wear resistance compared with metal.

The ceramic layer is formed in the bearing surface 12 and the joint socket 21 through a plasma deposition process, the ceramic layer is made of one or more of ZrO2, al2O3, siC and Nb2O5, and the thickness of the ceramic layer is 1-5 mu m.

The bottom surface of the bone platform 2 is connected with a rod piece 3, the rod piece 3 is of a three-dimensional net structure built by a 3D printing and forming porous structure, a hole extending to the length direction of the tibia is drilled on the tibia bone cutting surface during operation, the rod piece 3 of the bone platform 2 is inserted into the hole for fixation, the friction force between the rod piece 3 and the drilled hole is increased by the porous structure on the surface of the rod piece 3, therefore, a good fixation effect can be achieved without using bone cement, and the porous structure is beneficial to bone ingrowth, so that the long-acting fixation effect is achieved.

The replacement prosthesis of the present disclosure is made from biocompatible materials; such biocompatible materials may be selected from metals, metal alloys and organometallic compounds.

In another preferred embodiment, the porous structure is a bone-like trabecular structure.

In another preferred embodiment, the porous structure is a three-dimensional lattice structure of regular dodecahedron structure.

Accordingly, the present disclosure as contemplated is susceptible to many modifications and variations, all of which fall within the scope of the disclosed concept.

Furthermore, all the details may be replaced by other technically equivalent elements. In practice, the materials used, as well as the contingent shapes and dimensions, may be any according to requirements without thereby departing from the scope of protection of the following claims.

Claims (6)

1. A gold-porcelain bonded joint replacement prosthesis, characterized in that: comprising the following steps: a articular surface, a bone platform mounted to the post-osteotomy surface in the proximal tibial procedure, and a articular surface mounted to the post-osteotomy surface in the distal femoral procedure;

the articular surface includes: the joint surface is a curved surface connected with the femur distal end osteotomy surface, and the other side surface is a bearing surface;

the bearing surface of the joint surface is positioned in the joint nest of the bone platform, the bearing surface and the joint nest are coated with ceramic layers, and the bone platform is fixed to the surface of the tibia after osteotomy in the proximal tibia operation through a rod piece arranged on the bottom surface of the bone platform.

2. A gold porcelain bonded joint replacement prosthesis according to claim 1, wherein: the contact surface is provided with a fixing pile, and the fixing pile is driven into the osteotomy surface of the distal end of the femur in operation to fix the joint surface.

3. A gold porcelain bonded joint replacement prosthesis according to claim 1, wherein: the joint surface and the bone platform are molded by using a 3D printing technology and are porous structures.

4. A gold-ceramic bonded joint replacement prosthesis according to claim 3, wherein: the porosity of the porous structure is greater near the contact surface than near the load bearing surface.

5. A gold-ceramic bonded joint replacement prosthesis according to claim 3, wherein: the porous structure is a bone-like trabecular structure.

6. A gold-ceramic bonded joint replacement prosthesis according to claim 3, wherein: the porous structure is a three-dimensional grid structure with a regular dodecahedron structure.

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