CN220069930U

CN220069930U - Integrated acetabular prosthesis and artificial hip joint with same

Info

Publication number: CN220069930U
Application number: CN202320833660.2U
Authority: CN
Inventors: 柴伟
Original assignee: Beijing AK Medical Co Ltd; Fourth Medical Center General Hospital of Chinese PLA
Current assignee: Beijing AK Medical Co Ltd; Fourth Medical Center General Hospital of Chinese PLA
Priority date: 2023-04-13
Filing date: 2023-04-13
Publication date: 2023-11-24
Anticipated expiration: 2033-04-13

Abstract

The utility model provides an integrated acetabular prosthesis and an artificial hip joint with the same, wherein the integrated acetabular prosthesis comprises an acetabular cup and a protruding part, the acetabular cup is provided with a spherical nest, the protruding part is integrally formed on the outer surface of the acetabular cup, the integrated acetabular prosthesis is made of silicon nitride ceramics, and the outer surface of the integrated acetabular prosthesis is attached to the acetabular nest of a human body. According to the technical scheme provided by the utility model, the problem of abrasion between the acetabular cup and the acetabular liner in the related technology can be solved.

Description

Integrated acetabular prosthesis and artificial hip joint with same

Technical Field

The utility model relates to the technical field of prostheses, in particular to an integrated acetabular prosthesis and an artificial hip joint with the same.

Background

Hip joint replacement, also known as artificial hip joint replacement, is performed by implanting an artificial prosthesis into a human body to replace a diseased joint, so as to achieve the purposes of relieving joint pain, correcting deformity, recovering and improving the movement function of the joint.

In the related art, an acetabular prosthesis comprises an acetabular cup and an acetabular liner arranged in an acetabular cup, during the movement of a patient, abrasion is generated between the acetabular liner and the acetabular cup due to the movement, abrasive particles are generated, a light person causes osteolysis, the acetabular prosthesis is infected, a heavy person causes the acetabular prosthesis to fail, and a repair operation with greater damage and huge cost is necessary. Meanwhile, in order to make the acetabular liner more wear-resistant, it is necessary to make the acetabular liner as thicker as possible in order to extend the service life of the prosthesis. However, because unlimited enlargement of the acetabular cup is not possible, when the acetabular liner is thicker, the artificial femoral head needs to be selected to be smaller in size, thereby risking post-operative dislocation.

Disclosure of Invention

The utility model provides an integrated acetabular prosthesis and an artificial hip joint with the same, which are used for solving the problem of abrasion between an acetabular cup and an acetabular liner in the related art.

According to one aspect of the utility model, there is provided an integrated acetabular prosthesis comprising an acetabular cup and a projection, the acetabular cup having a spherical socket, the projection being integrally formed on an outer surface of the acetabular cup, the integrated acetabular prosthesis being of silicon nitride ceramic, the outer surface of the integrated acetabular prosthesis being in contact with the acetabular socket of a human body.

Further, the projection includes a plurality of protrusions spaced apart from an outer surface of the acetabular cup.

Further, the cross-sectional dimension of the boss gradually decreases in a direction from the interior to the exterior of the acetabular cup.

Further, the height of the protrusions is between 3mm and 100 mm.

Further, the angle between the axis of the protrusion and the normal to the plane in which the opening of the acetabular cup lies is between 0 ° and 45 °.

Further, the thickness dimension of the acetabular cup is less than or equal to 50mm.

Further, the inner surface of the acetabular cup is smooth.

Further, the outer surface of the acetabular cup is of a rough gradient porous structure.

According to another aspect of the present utility model there is provided an artificial hip joint comprising an artificial femoral head and an integral acetabular prosthesis, the integral acetabular prosthesis being arranged in a human acetabular fossa, the artificial femoral head being movable in a spherical fossa of the integral acetabular prosthesis, the integral acetabular prosthesis being provided as described above.

By applying the technical scheme of the utility model, the integrated acetabular prosthesis comprises the acetabular cup and the bulge, when the acetabular prosthesis is implanted into a human body, the acetabular cup is placed in an acetabular fossa of the human body, the bulge integrally formed on the outer surface of the acetabular cup is inserted into the acetabular fossa of the human body to fix the acetabular cup, and the artificial femoral head is placed in a spherical fossa of the acetabular cup to realize free movement of the femoral head relative to the acetabular cup. Because the integrated acetabular prosthesis is made of silicon nitride ceramic, the integrated acetabular prosthesis has high hardness, high bending strength and high fracture toughness, and the comprehensive performance of the integrated acetabular prosthesis is improved. Compared with the mode of matching the acetabular cup and the acetabular liner in the related art, the integrated acetabular prosthesis is adopted, the use of the acetabular liner is abandoned, abrasion between the acetabular cup and the acetabular liner can be avoided, meanwhile, the size of a spherical nest of the integrated acetabular prosthesis can be made larger, the artificial femoral head is made larger, and the risk that the artificial femoral head is separated from the spherical nest is reduced.

Drawings

The accompanying drawings, which are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this specification, illustrate embodiments of the utility model and together with the description serve to explain the utility model. In the drawings:

FIG. 1 shows a schematic structural view of an integrated acetabular prosthesis provided according to an embodiment of the utility model;

FIG. 2 illustrates a front view of an integrated acetabular prosthesis provided according to an embodiment of the utility model;

fig. 3 shows a cross-sectional view of an integrated acetabular prosthesis provided according to an embodiment of the utility model.

Wherein the above figures include the following reference numerals:

10. an acetabular cup; 11. a spherical nest;

20. a protruding portion; 21. a protrusion.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. The following description of at least one exemplary embodiment is merely exemplary in nature and is in no way intended to limit the utility model, its application, or uses. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

As shown in fig. 1 to 3, an embodiment of the present utility model provides an integrated acetabular prosthesis, which includes an acetabular cup 10 and a protruding portion 20, wherein the acetabular cup 10 has a spherical socket 11, the protruding portion 20 is integrally formed on an outer surface of the acetabular cup 10, the integrated acetabular prosthesis is made of silicon nitride ceramic, and the outer surface of the integrated acetabular prosthesis is attached to the acetabular socket of a human body.

By applying the technical scheme of the utility model, the integrated acetabular prosthesis comprises the acetabular cup 10 and the convex part 20, when being implanted into a human body, the acetabular cup is placed in an acetabular fossa of the human body, the convex part 20 integrally formed on the outer surface of the acetabular cup is inserted into the acetabular fossa of the human body to fix the acetabular cup, and the artificial femoral head is placed in a spherical fossa of the acetabular cup to realize free movement of the femoral head relative to the acetabular cup. Because the integrated acetabular prosthesis is made of silicon nitride ceramic, the integrated acetabular prosthesis has high hardness, high bending strength and high fracture toughness, and the comprehensive performance of the integrated acetabular prosthesis is improved. Compared with the mode of matching the acetabular cup and the acetabular liner in the related art, the integrated acetabular prosthesis is adopted, the use of the acetabular liner is abandoned, abrasion between the acetabular cup and the acetabular liner can be avoided, meanwhile, the size of the spherical socket 11 of the integrated acetabular prosthesis can be made larger, the artificial femoral head is made larger, and the risk that the artificial femoral head is separated from the spherical socket 11 is reduced.

Another problem with artificial hip arthroplasty in the related art is post-operative dislocation of the artificial femoral head, which can be addressed by using a large diameter artificial femoral head and acetabular liner with high sides. However, the size of the acetabular cup cannot be made larger because of the relatively constant size of the acetabular cup. In order to make the acetabular liner more wear resistant, it is desirable that the acetabular liner be relatively thick to extend the useful life of the prosthesis. However, after the size of the acetabular cup is determined, the size of the artificial femoral head is reduced by selecting an acetabular liner with larger thickness, so that the risk of dislocation of the artificial bone is increased, and the artificial femoral head with larger size is required to be used for preventing dislocation. The integrated acetabular prosthesis can be used for discarding the use of an acetabular liner, so that the size of a spherical nest can be increased, and the size of an artificial femoral head can be increased.

In this embodiment, the use of the projections 20 may enhance the initial stability of the acetabular cup 10, facilitating reliable biostatic fixation.

As shown in fig. 1 and 2, the projection 20 includes a plurality of projections 21 spaced apart from the outer surface of the acetabular cup 10. The convex part 20 made of a plurality of bulges 21 has the advantages of simple structure and convenient processing.

As shown in FIG. 2, the cross-sectional dimension of the boss 21 gradually decreases in a direction from the interior to the exterior of the acetabular cup 10. The bulge 21 with the structure is convenient for the bulge 21 to be inserted into the bones of a human body, and is beneficial to the operation of surgery.

Wherein the protrusions 21 may be arranged correspondingly at different anatomical locations as desired.

In other embodiments, the ends of the boss 21 may be provided in a hooked configuration in order to provide a more secure fixation of the boss 21 to the acetabular cup 10.

It should be noted that the shape of the boss 21 may be provided in other forms as long as a secure fixation of the acetabular cup 10 is provided.

In the present embodiment, the height of the protrusions 21 is between 3mm and 100 mm. With the adoption of the protrusions 21 with the height, the protrusions 21 can be connected with bones of a human body more firmly, so that the fixing effect of the acetabular cup 10 is enhanced.

Wherein the height of the protrusions 21 may be any value between 3mm, 10mm, 20mm, 50mm, 100mm, and 3mm to 100 mm.

As shown in FIG. 2, the angle between the axis of the boss 21 and the normal to the plane in which the opening of the acetabular cup 10 lies is between 0 and 45. With the above structure, when the acetabular cup 10 is implanted into a human body, the protrusions 21 can be made to face the bones of the human body, thereby facilitating the implantation of the acetabular cup 10.

Of course, the extension direction of the projection 21 may be set to other directions as long as the acetabular cup 10 can be implanted into a human body without generating a reaction force.

In this embodiment, the thickness dimension of the acetabular cup 10 is less than or equal to 50mm. By adopting the size range, the spherical socket 11 can have larger size on the premise of not affecting the structural strength and the wear resistance of the acetabular cup 10, so that the size of the artificial femoral head can be increased to prevent dislocation of the artificial femoral head.

The thickness dimension of the acetabular cup 10 may be any of 10mm, 20mm, 30mm, 40mm, 50mm, and less than or equal to 50mm.

In this embodiment, the inner surface of the acetabular cup 10 is smooth. By utilizing the smooth surface, the friction force between the artificial femoral head and the spherical socket 11 can be reduced, so that the abrasion between the artificial femoral head and the acetabular cup 10 is reduced, and the service life of the prosthesis is prolonged.

Specifically, the outer surface of the acetabular cup 10 is of a rough gradient porous structure. Bone ingrowth can be facilitated by the porous structural layer, thereby enhancing the long-term biostatic properties of the acetabular cup 10 and the patient's bone.

Wherein, the rough gradient porous structure refers to the porous structure of the acetabular cup 10 gradually changing from compact to loose in the direction of the inner surface of the acetabular cup 10 pointing to the outer surface thereof, and the porous structure forms a rough surface on the outer surface of the acetabular cup 10.

Wherein the outer surface of the acetabular cup 10 is roughened. The rough surface can increase the friction force between the acetabular cup 10 and the bone of the patient, thereby facilitating the relative fixation of the acetabular cup 10 and the bone of the patient and facilitating bone ingrowth.

It should be noted that the porous structure includes a plurality of growing holes from outside to inside, and parameters such as specific pore diameter, porosity, pore intercept of the growing holes can be adjusted according to practical situations, so as to facilitate bone ingrowth.

In the related art, bone ingrowth is facilitated by providing a bone-like trabecular structure, such as tantalum metal trabecular, and assisting in providing a hydroxyapatite coating. However, there is a problem with the reliability of the bond between the additional coating and the acetabular cup, which is prone to sloughing.

It should be noted that, in the acetabular prosthesis in the related art, the roughness of the outer surface of the acetabular cup is increased by providing the metal coating, however, an additional metal coating is provided, and there is a problem of reliability of bonding between the coating and the acetabular cup, so that the acetabular cup is easy to fall off. In this embodiment, the integrated acetabular prosthesis made of silicon nitride ceramic material can form a rough surface on the outer surface of the acetabular cup 10 during sintering, and thus there is no problem of bonding reliability. Of course, the roughened surface may be formed by post-processing.

Still another embodiment of the present utility model provides an artificial hip joint, including an artificial femoral head and an integrated acetabular prosthesis, the integrated acetabular prosthesis being disposed in a human acetabular fossa, the artificial femoral head being movable in a spherical fossa 11 of the integrated acetabular prosthesis, the integrated acetabular prosthesis being provided as described above. By adopting the artificial hip joint, the integrated acetabular prosthesis is made of silicon nitride ceramic material, has high hardness, high bending strength and high fracture toughness, and improves the structural performance. Compared with the mode of matching the acetabular cup and the acetabular liner in the related art, the integrated acetabular prosthesis is adopted, so that the use of the acetabular liner is abandoned, and further abrasion between the acetabular cup and the acetabular liner can be avoided. And the size of the ball socket can be increased to increase the size of the artificial femoral head.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the present utility model. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.

The relative arrangement of the components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present utility model unless it is specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective parts shown in the drawings are not drawn in actual scale for convenience of description. Techniques, methods, and apparatus known to one of ordinary skill in the relevant art may not be discussed in detail, but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any specific values should be construed as merely illustrative, and not a limitation. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further discussion thereof is necessary in subsequent figures.

In the description of the present utility model, it should be understood that the azimuth or positional relationships indicated by the azimuth terms such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal", and "top, bottom", etc., are generally based on the azimuth or positional relationships shown in the drawings, merely to facilitate description of the present utility model and simplify the description, and these azimuth terms do not indicate and imply that the apparatus or elements referred to must have a specific azimuth or be constructed and operated in a specific azimuth, and thus should not be construed as limiting the scope of protection of the present utility model; the orientation word "inner and outer" refers to inner and outer relative to the contour of the respective component itself.

Spatially relative terms, such as "above … …," "above … …," "upper surface at … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial location relative to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "above" or "over" other devices or structures would then be oriented "below" or "beneath" the other devices or structures. Thus, the exemplary term "above … …" may include both orientations of "above … …" and "below … …". The device may also be positioned in other different ways (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

In addition, the terms "first", "second", etc. are used to define the components, and are only for convenience of distinguishing the corresponding components, and the terms have no special meaning unless otherwise stated, and therefore should not be construed as limiting the scope of the present utility model.

The above description is only of the preferred embodiments of the present utility model and is not intended to limit the present utility model, but various modifications and variations can be made to the present utility model by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model should be included in the protection scope of the present utility model.

Claims

1. The utility model provides an integral type acetabular bone false body, its characterized in that, integral type acetabular bone false body includes acetabular cup (10) and bulge (20), acetabular cup (10) have ball-type nest (11), bulge (20) integrated into one piece is in the surface of acetabular cup (10), the material of integral type acetabular bone false body is the silicon nitride pottery, the surface of integral type acetabular bone false body is laminated with human acetabular cup.

2. The integrated acetabular prosthesis of claim 1, wherein the projection (20) includes a plurality of protrusions (21) spaced apart on an outer surface of the acetabular cup (10).

3. The integrated acetabular prosthesis according to claim 2, characterized in that the cross-sectional dimension of the protuberance (21) gradually decreases in a direction from the interior to the exterior of the acetabular cup (10).

4. The integrated acetabular prosthesis according to claim 2, characterized in that the height of the protuberance (21) is between 3mm and 100 mm.

5. The integrated acetabular prosthesis according to claim 2, characterized in that the angle between the axis of the protuberance (21) and the normal to the plane in which the opening of the acetabular cup (10) lies is between 0 ° and 45 °.

6. The integrated acetabular prosthesis of claim 1, wherein the thickness dimension of the acetabular cup (10) is less than or equal to 50mm.

7. The integrated acetabular prosthesis of claim 1, wherein an inner surface of the acetabular cup (10) is smooth.

8. The integrated acetabular prosthesis according to claim 1, wherein the outer surface of the acetabular cup (10) is of a roughened gradient porous structure.

9. An artificial hip joint, characterized in that it comprises an artificial femoral head and an integral acetabular prosthesis, said integral acetabular prosthesis being arranged in the human acetabular fossa, said artificial femoral head being movable in a spherical fossa (11) of said integral acetabular prosthesis, said integral acetabular prosthesis being an integral acetabular prosthesis according to any of claims 1 to 8.