CN113730043B

CN113730043B - Acetabular cup assembly

Info

Publication number: CN113730043B
Application number: CN202111142267.0A
Authority: CN
Inventors: 徐寒冬; 陈夕辉; 马世骧
Original assignee: Shanghai Lianying Zhirong Medical Technology Co ltd
Current assignee: Shanghai Lianying Zhirong Medical Technology Co ltd
Priority date: 2021-09-28
Filing date: 2021-09-28
Publication date: 2024-05-28
Anticipated expiration: 2041-09-28
Also published as: CN113730043A

Abstract

The present invention relates to acetabular cups, and more particularly to an acetabular cup assembly. The acetabular cup assembly comprises a cup body, wherein one or more concave parts are arranged on the inner surface of the cup body and are adjacent to the end surface, and a first locking part is arranged on the side surface of each concave part; a gasket, wherein one or more protruding parts are arranged on the outer surface of the gasket near the end surface of the gasket, and a second locking part is arranged on the side surface of the protruding part; the plurality of protruding parts are respectively matched with the plurality of concave parts, and the axial limit between the liner and the cup body is realized through the cooperation of the first locking part and the second locking part. Compared with the prior art, the invention has the advantages that: before the second locking part and the first locking part are mutually matched, the convex part and the concave part are firstly aligned, and then the second locking part and the first locking part are mutually matched, so that multiple alignments between the convex part and the concave part are avoided, and the assembly difficulty is greatly reduced.

Description

Acetabular cup assembly

Technical Field

The present invention relates to acetabular cups, and more particularly to an acetabular cup assembly.

Background

Orthopedic implants are increasingly being used to treat degenerative diseases and other conditions affecting hip, knee, shoulder and other joint functions. One common application for orthopedic implants is for hip replacement surgery. The hip joint consists of a spherical head of the femur and a cup-shaped acetabulum of the pelvis. To replace the hip joint, a rod is inserted into the femur. On the proximal end of the stem, the ball mimics the spherical head of a femur. A cup is implanted in the pelvis to simulate an acetabulum, which mates with the stem to complete the replacement of the hip joint.

Existing acetabular cup assemblies include liners and cups, but the liners and cups need to ensure that the protrusions of the liner align with the recesses before the second locking portion and the first locking portion contact during assembly, otherwise insufficient liner to cup adhesion may occur.

Disclosure of Invention

In view of the above, the present invention provides an acetabular cup assembly that enhances the fit between a liner and a cup.

In order to solve the technical problems, the invention provides the following technical scheme:

An acetabular cup assembly comprising a cup having a cup inner surface defining an interior space and a cup outer surface defining an exterior surface, an end surface connecting the cup inner surface and the cup outer surface, and an apex located on the cup inner surface distal from the end surface; a plurality of concave parts are arranged on the inner surface of the cup body and adjacent to the end surface, and a first locking part is arranged on the side surface of each concave part; a liner having a liner outer surface defining an outer surface and a liner end surface, the liner outer surface being provided with one or more projections adjacent the liner end surface, the projections being provided with second locking portions on sides thereof; when the gasket is installed in the cup body, one or more protruding parts are respectively matched with the plurality of concave parts, and axial limiting between the gasket and the cup body is realized through the matching of the first locking part and the second locking part.

It can be appreciated that the second locking portion is arranged on the protruding portion, and the first locking portion is arranged on the concave portion, so that before the second locking portion and the first locking portion are mutually matched, the protruding portion and the concave portion are firstly aligned, and then the second locking portion and the first locking portion are mutually matched, multiple alignments between the protruding portion and the concave portion are avoided, and assembly difficulty between the liner and the cup body is greatly reduced.

In one embodiment, the first locking portion is a concave section formed toward the inside of the cup body, and the second locking portion is a convex section formed toward the outside of the liner, the concave section and the convex section cooperatively defining an axial movement between the liner and the cup body; or the first locking part is a convex section formed towards the outside of the cup body, the second locking part is a concave section formed towards the inside of the liner, and the convex section and the concave section are mutually matched to realize axial limit between the liner and the cup body.

It is understood that the concave section and the convex section are mutually matched to realize the clamping of the liner in the cup body, so that the axial limit between the liner and the cup body is realized.

In one embodiment, a first guide section is arranged on the side surface of the concave part and adjacent to the end surface; a second guide section is arranged on the side surface of the protruding part and adjacent to the end surface of the liner; the second guide section is capable of cooperating with the first guide section to guide the male section into the female section.

It will be appreciated that by the interengagement between the first and second guide sections, the insertion of the projection into the recess serves as a guide to facilitate alignment between the projection and the recess.

In one embodiment, a first anti-rotation part is arranged on the inner surface of the cup body near the vertex, and a second anti-rotation part is arranged on the outer surface of the liner; the first anti-rotation portion cooperates with the second anti-rotation portion to define a non-axial movement between the liner and the cup when the liner is installed in the cup.

It will be appreciated that by the engagement of the first anti-rotation portion with the second anti-rotation portion, non-axial movement between the liner and the cup is defined

In one embodiment, the first anti-rotation portion is a plurality of anti-rotation grooves, and the second anti-rotation portion is a plurality of anti-rotation protrusions; or the first anti-rotation part is a plurality of anti-rotation protrusions, and the second anti-rotation part is a plurality of anti-rotation grooves.

In one embodiment, the adjacent concave portions have the same included angle around the central axis of the cup body.

In one embodiment, the adjacent anti-rotation grooves have the same included angle around the central axis of the cup body.

In one embodiment, the included angle (alpha) between adjacent concave parts around the central axis of the cup body is in a multiple relationship with the included angle (beta) between adjacent anti-rotation grooves around the central axis of the cup body.

It can be appreciated that the normal alignment assembly between the liner and the cup body is realized by enabling the included angle (alpha) between adjacent concave parts around the central axis of the cup body to be in a multiple relationship with the included angle (beta) between adjacent anti-rotation grooves around the central axis of the cup body, so that the liner and the cup body are prevented from being incapable of being assembled.

In one embodiment, the anti-rotation grooves and the anti-rotation protrusions are all annular.

In one embodiment, the liner is mounted in the cup with a clearance fit between the inner surface of the cup and the outer surface of the liner.

Compared with the prior art, the second locking part is arranged on the protruding part, the first locking part is arranged on the concave part, so that before the second locking part and the first locking part are mutually matched, the protruding part and the concave part are firstly aligned, and then the second locking part and the first locking part are mutually matched, thereby avoiding multiple alignments between the protruding part and the concave part, and greatly reducing the assembly difficulty between the liner and the cup body.

Drawings

FIG. 1 is a schematic view of the structure of an acetabular cup assembly provided by the invention;

FIG. 2 is a schematic cross-sectional view of an acetabular cup assembly provided by the invention;

FIG. 3 is a schematic diagram of the structure shown at A in FIG. 2;

FIG. 4 is a schematic diagram of the structure at B in FIG. 2;

FIG. 5 is a schematic view of a gasket according to the present invention;

Fig. 6 is a schematic structural view of a cup according to the present invention.

Reference numerals:

100. An acetabular cup assembly; 10. a cup body; 11. an end face; 12. a recessed portion; 121. a first locking portion; 1211. a convex section; 1211a, a second planar segment; 1211b, a first elliptical arc segment; 1212. a second guide section; 1212a, a chamfer segment; 1212b, guide arc segments; 13. the outer surface of the cup body; 14. the inner surface of the cup body; 141. a first anti-rotation portion; 1411. an anti-rotation groove; 20. a gasket; 21. a protruding portion; 211. a second locking portion; 2111. a recessed section; 2111a, a first planar segment; 2112. a first guide section; 2112a, a second elliptical arc section; 2112b, rounded sections; 22. an outer surface of the liner; 221. a second anti-rotation portion; 2211. anti-rotation protrusions; 23. and the end face of the gasket.

Detailed Description

The present invention will be further described in detail with reference to the drawings and the detailed description, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the detailed description and specific examples are intended for purposes of illustration only and are not intended to limit the scope of the invention.

It is noted that when an element is referred to as being "mounted to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "secured to" another element, it can be directly secured to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like are used herein for illustrative purposes only and are not meant to be the only embodiment.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "or/and" as used herein includes any and all combinations of one or more of the associated listed items.

Referring to fig. 1 and 6, the present invention provides an acetabular cup assembly 100, wherein the acetabular cup assembly 100 is used in hip replacement surgery, and is mainly used for performing hip replacement on a human body with a problem acetabulum.

The prior acetabular cup assembly needs to ensure that the convex part and the concave part of the liner are aligned before the second locking part and the first locking part are contacted when the liner and the cup body are assembled, otherwise, the problem of insufficient adhesion of the liner and the cup body occurs; the unreasonable design of the second locking part and the first locking part also causes the problems of small release force or overlarge assembly force of the liner and the cup body, damage or extrusion large deformation of the second locking part and the first locking part and the like, and further causes the problems of easy loosening, easy abrasion and the like of the acetabular cup component.

The problem that the assembly performance of the existing acetabular cup component is not high is solved. The present invention provides an acetabular cup assembly 100 comprising a cup 10, the cup 10 having a cup inner surface 14 defining an interior space and a cup outer surface 13 defining an exterior surface, an end face 11 connecting the cup inner surface 14 and the cup outer surface 13, and an apex located on the cup inner surface 14 away from the end face 11; one or more concave parts 12 are arranged on the inner surface 14 of the cup body and adjacent to the end surface 11, and a first locking part 121 is arranged on the side surface of the concave part 12; a pad 20, the pad 20 having a pad outer surface 22 defining an outer surface and a pad end surface 23, the pad outer surface 22 being provided with one or more protrusions 21 near the pad end surface 23, the protrusions 21 being provided with second locking portions 211 on sides thereof; when the gasket 20 is mounted in the cup 10, the plurality of projections 21 are respectively fitted with the plurality of recesses 12, and axial limitation between the gasket 20 and the cup 10 is achieved by the cooperation of the first locking portion 121 and the second locking portion 211.

According to the application, the second locking part 211 is arranged on the protruding part 21, and the first locking part 121 is arranged on the concave part 12, so that before the second locking part 211 and the first locking part 121 are mutually matched, the protruding part 21 and the concave part 12 are firstly aligned, and then the second locking part 211 and the first locking part 121 are mutually matched, thereby avoiding multiple alignments between the protruding part 21 and the concave part 12, and greatly reducing the assembly difficulty between the liner 20 and the cup body 10.

It should be noted that the spacer 20 may be configured as a bearing for a ball of a femoral implant. The cup 10 and liner 20 may be provided in a variety of sizes to allow the surgeon to select the appropriate size according to the anatomy of the patient. The cup 10 may be compatible with a plurality of liners 20. For example, a single cup 10 may be compatible with ceramic liners, polymer liners, metal liners 20, and liners 20 of other suitable materials.

As shown in fig. 1 and 2, the cup 10 has a hemispherical shape having a space therein, and the liner 20 has a hemispherical shape that can be accommodated in the body. The cup 10 and the pad 20 are formed in a hemispherical shape so as to simulate the hip joint part of a human body, thus being capable of being better matched with the hip joint of the human body.

In this embodiment, the cup 10 and liner 20 may be constructed of any suitable material. For example, the cup 10 may be constructed from other biocompatible materials such as titanium alloys, cobalt chrome alloys, stainless steel, or polyetheretherketone. The liner 20 may be constructed of ultra-high molecular weight polyethylene, high cross-linked polyethylene, vitamin E-doped polyethylene, or the like; the materials of the cup 10 and the liner 20 are not limited herein.

Further, the outer cup surface 13 of the cup 10 may be coated with a coating that improves bone ingrowth or improves the retention of the shell in the acetabulum. For example, the coating may be a porous coating, or may be a sintered metal coating, a vapor deposited metal coating, a thermal sprayed metal coating, or chemically etched, without limitation.

Specifically, the convex part 21 on the liner 20 is aligned with the concave part 12 on the cup body 10 in sequence, then the liner 20 is assembled in the inner surface 14 of the cup body 10, the convex part 21 is matched with the concave part 12 in a concave-convex way, and the assembly between the liner 20 and the cup body 10 is realized; since the protruding portions 21 are arranged at intervals along the circumferential direction of the liner 20, and the corresponding concave portions 12 on the cup body 10 are also arranged at the same intervals on the end face 11, when the protruding portions 21 fall into the concave portions 12 to be matched with each other in a concave-convex manner, circumferential limitation is achieved between the cup body 10 and the liner 20, that is, the liner 20 cannot rotate relative to the circumferential direction of the cup body 10.

Further, when the liner 20 is installed in the cup 10, the cup inner surface 14 is in a clearance fit with the liner outer surface 22. The clearance fit between the inner surface 14 of the cup and the outer surface 22 of the liner prevents wear between the inner surface 14 of the cup and the outer surface 22 of the liner during assembly of the cup 10 and the liner 20.

As shown in fig. 3 and 4, the second locking portion 211 includes a concave section 2111 concave toward the cup 10, and the first locking portion 121 includes a convex section 1211 convex toward the cup 10. When the convex portion 21 of the liner 20 and the concave portion 12 of the cup body 10 are aligned in sequence, the liner 20 is gently placed into the cup body 10, at this time, the convex portion 21 is gently dropped into the concave portion 12, but at this time, the concave portion of the convex portion 21 and the convex portion 1211 of the concave portion 12 are still staggered, a force towards the cup body 10 needs to be manually applied to the liner 20, the convex portion 1211 is only blocked into the concave portion 2111, and axial limitation between the cup body 10 and the liner 20 is realized, that is, the convex portion 1211 and the concave portion 2111 are clamped with each other in the axial direction.

Of course, the convex section 1211 is not limited to being provided on the concave portion 12, nor is the concave section 2111 limited to being provided on the convex portion 21; in one embodiment, the second locking portion 211 includes a convex segment 1211 protruding away from the cup 10, and the first locking portion 121 includes a concave segment 2111 recessed away from the cup 10, the concave segment 2111 and the convex segment 1211 cooperating to effect axial restraint between the liner 20 and the cup 10. In this embodiment, the convex section 1211 and the concave section 2111 are mated in the same manner as in the above embodiment, and a detailed description thereof will be omitted.

Further, the concave section 2111 includes a first planar section 2111a and the convex section 1211 includes a second planar section 1211a. When the male segment 1211 is snapped into the female segment 2111, the first and second planar segments 2111a and 1211a are in close proximity to each other. The surface-to-surface engagement enhances the tightness of the male and female portions 1211, 2111, preventing the male and female portions 1211, 2111 from being separated from each other, thereby causing the liner 20 to be detached from the cup 10, enhancing the strength of the snap-fit between the female and male portions 2111, 2111.

Specifically, the raised segment 1211 further includes a first elliptical arc segment 1211b connected to a second planar segment 1211 a. The ratio of the radius of the first elliptical arc segment 1211b to the radius of the second planar segment 1211a is set to a first preset value to allow the second locking portion 211 to be snapped into place with the first locking portion 121. The first preset value is set between 0.3 and 0.6. That is, the ratio of the radius of the first elliptical arc segment 1211b to the radius of the second planar segment 1211a may be set to 0.3, 0.4,0.5, or 0.6; in the present embodiment, the ratio of the radius of the first elliptical arc section 1211b to the radius of the second planar section 1211a is preferably set to 0.45; of course, in other embodiments, the ratio of the radius of the first elliptical arc segment 1211b to the radius of the second planar segment 1211a may be set to other values according to different situations, and is not limited herein.

The curvature of a planar curve is the rotation rate of the tangential angle to the arc length for a point on the curve, indicating the degree to which the curve deviates from a straight line. For a curve it is equal to the radius of the arc of the curve closest to that point. For a surface, the radius of curvature is the radius of a circle that best fits a normal cross-section or a combination thereof. The radius of curvature is primarily used to describe the degree to which a curve curves somewhere on the curve.

Depending on the material of the cushion 20, the cushion 20 is a flexible structure having elasticity, and then the ratio of the radius of the first elliptical arc section 1211b to the radius of the second planar section 1211a can be set according to the elastic modulus of the cushion 20. For example, for a liner 20 having a greater modulus of elasticity, the ratio of the radius of the first elliptical arc segment 1211b to the radius of the second planar segment 1211a needs to be increased appropriately. When the elastic modulus of the material of the pad 20 is large, the possibility of detachment between the convex section 1211 and the concave section 2111 increases, so that the radius of curvature of the first elliptical arc 1211b should be increased at this time; for a liner 20 with a lower modulus of elasticity, where the hardness of the liner 20 is higher, the difficulty of pressing the convex segment 1211 into the concave segment 2111 increases, and where the radius of curvature of the first elliptical arc 1211b should be properly reduced, so as to facilitate a concave-convex fit between the convex segment 1211 and the concave segment 2111.

Therefore, the ratio of the radius of the first elliptical arc segment 1211b to the radius of the second planar segment 1211a needs to be set between 0.3-0.6, and the radius of curvature of the first elliptical arc segment 1211b is selected within this suitable range of values to better adapt to the elastic modulus of the material of the cushion 20.

Further, the second locking portion 211 also includes a first guide section 2112, the first guide section 2112 including a second elliptical arc section 2112a and a rounded corner section 2112b that are tangentially connected to each other. The second elliptical arc section 2112a is located at one end of the concave section 2111 near the cup 10, and two ends of the second elliptical arc section 2112a are respectively connected with the first plane section 2111a and the rounded corner section 2112b, and the curvature radius of the second elliptical arc section 2112a gradually increases from the first plane section 2111a towards the rounded corner section 2112b.

The first locking portion 121 also includes a second guide segment 1212, the second guide segment 1212 including a chamfer segment 1212a and a guide arc segment 1212b that are interconnected. The chamfer segment 1212a is disposed adjacent to the end face 11 relative to the guide arc segment 1212b, and the two ends of the guide arc segment 1212b are connected to the chamfer segment 1212a and the first elliptical arc segment 1211b, respectively.

Specifically, the ratio of the radius of the second elliptical arc section 2112a to the radius of the first planar section 2111a is set to a second preset value to snap-fit between the second locking portion 211 and the first locking portion 121. The second preset value is set between 0.1 and 0.2. That is, the ratio of the radius of the second elliptical arc section 2112a to the radius of the first planar section 2111a may be set to 0.1, 0.12, 0.14, 0.16, or 0.2; in the present embodiment, the ratio of the radius of the second elliptical arc section 2112a to the radius of the first planar section 2111a is preferably set to 0.16; of course, in other embodiments, the ratio of the radius of the second elliptical arc segment 2112a to the radius of the first planar segment 2111a may be set to other values according to different circumstances, and is not limited herein.

The ratio of the radius of the second elliptical arc segment 2112a to the radius of the first planar segment 2111a is set between 0.1 and 0.2, also to accommodate the elastic modulus of the material of the cup 10, and the reason for this is not repeated here.

When the liner 20 is required to be assembled into the inner surface 14 of the cup body 10, the convex portion 21 can be quickly positioned and aligned with the concave portion 12 according to the chamfer segment 1212a on the concave portion 12, at this time, the chamfer segment 2112b is contacted with the chamfer segment 1212a, after the positioning action of the chamfer segment 1212a, the convex portion 21 on the liner 20 is sequentially aligned with the concave portion 12 on the cup body 10, at this time, the liner 20 is gently placed into the cup body 10, the convex portion 21 is gently dropped into the concave portion 12, the chamfer segment 2112b is gently slid from the chamfer segment 1212a to the guide arc segment 1212b, at this time, the second elliptical arc segment 2112a is contacted with the guide arc segment 1212b, and the guide fit between the first guide segment 2112 and the second guide segment 1212 is prepared for the convex segment 1211 to be snapped into the concave segment 2111.

As shown in fig. 5 and 6, a first anti-rotation portion 141 is provided on the inner surface 14 of the cup body near the vertex, and a second anti-rotation portion 221 is provided on the outer surface 22 of the pad; when the liner 20 is installed in the cup 10, the first anti-rotation portion 141 cooperates with the second anti-rotation portion 221 to define a non-axial movement between the liner 20 and the cup 10.

The non-axial movement refers to movement in any direction other than the axial direction. Since the axial movement between the liner 20 and the cup 10 has been restricted by the fitting between the projection 21 and the recess 12, the provision of the first and second anti-rotation portions 141 and 221 in cooperation with the projection 21 and the recess 12 restricts movement in any direction between the liner 20 and the cup 10, enhancing the fitting firmness between the liner 20 and the cup 10.

The outer surface 22 of the liner is provided with an anti-rotation groove 1411, and the inner surface 14 of the cup body is provided with an anti-rotation protrusion 2211 corresponding to the anti-rotation groove 1411; or the outer surface 22 of the liner is provided with anti-rotation protrusions 2211, and the inner surface 14 of the cup body is provided with anti-rotation grooves 1411 corresponding to the anti-rotation protrusions 2211. The anti-rotation protrusions 2211 cooperate with the anti-rotation grooves 1411 as the liner 20 is fitted into the cup 10 to achieve circumferential spacing between the liner 20 and the cup 10.

Alternatively, the number of anti-rotation protrusions 2211 may be set to one or more. It should be noted that, when the anti-rotation protrusion 2211 is provided as one, the cross-sectional shape of the anti-rotation protrusion 2211 may not be provided as a shape which is similar to a circular shape and cannot restrict circumferential rotation between the liner 20 and the cup 10. The number of anti-rotation protrusions 2211 is not particularly limited herein, as long as the engagement between the anti-rotation protrusions 2211 and the anti-rotation grooves can achieve circumferential limitation between the liner 20 and the cup 10.

In the present embodiment, the number of anti-rotation protrusions 2211 is preferably set to three. And the three anti-rotation protrusions 2211 are distributed in a central symmetry manner relative to the center of the cup body 10. Correspondingly, the number of the anti-rotation grooves 1411 is also three, and the three anti-rotation grooves 1411 are distributed in a central symmetry manner relative to the center of the gasket 20.

Preferably, anti-rotation groove 1411 and anti-rotation protrusion 2211 are both disposed in an annular shape; of course, in other embodiments, the anti-rotation groove 1411 and the anti-rotation protrusion 2211 may have other shapes such as V-shape, which is not limited herein.

Alternatively, the cross-sectional shape of the anti-rotation protrusion 2211 is an arc shape or a polygonal shape. The cross-sectional shape of the anti-rotation protrusion 2211 is not particularly limited herein as long as circumferential limitation between the liner 20 and the cup 10 can be achieved.

Further, the angle (α) between adjacent recesses 12 is the same about the central axis of the cup 10. That is, the concave portions 12 are uniformly distributed on the end face 11 in the circumferential direction of the cup body 10.

Further, the adjacent anti-rotation grooves 1411 have the same included angle about the central axis of the cup 10. That is, the anti-rotation grooves 1411 are evenly distributed in the cup inner surface 14 in the circumferential direction of the cup 10.

Further, the included angle (α) between adjacent recesses 12 about the central axis of the cup 10 is multiplied by the included angle (β) between adjacent anti-rotation grooves 1411 about the central axis of the cup 10.

This is because, when the angle (α) between adjacent recesses 12 about the central axis of the cup 10 is multiplied by the angle (β) between adjacent anti-rotation grooves 1411 about the central axis of the cup 10, the anti-rotation protrusions 2211 and the anti-rotation grooves, the protrusions 21 and the recesses 12 can be easily and completely engaged with each other regardless of the rotation of the gasket 20. Given that when the angle (α) between the adjacent concave portions 12 around the central axis of the cup body 10 and the angle (β) between the adjacent anti-rotation grooves 1411 around the central axis of the cup body 10 are not multiplied, the anti-rotation protrusions 2211 and the anti-rotation grooves are engaged, and the convex portions 21 and the concave portions 12 are engaged only at fixed positions, difficulty in assembly is greatly increased, so that the gasket 20 and the cup body 10 are difficult to assemble.

During the process of assembling the liner 20 and the cup body 10 with each other, the convex part 21 on the liner 20 and the concave part 12 of the cup body 10 are positioned, aligned and pressed in through the chamfer section 1212a on the concave part 12, and before the chamfer section 2112b on the convex part 21 is contacted with the guide arc section 1212b on the concave part 12, the convex part 21 and the concave part 12 are locked in the circumferential direction at this time, namely, centering is realized; continuing to press down the liner 20, the second elliptical arc segment 2112a on the protrusion 21 slides down along the guiding arc segment 1212b on the recess 12, so that the first planar segment 2111a on the concave segment 2111 and the second planar segment 1211a on the convex segment 1211 are finally attached to each other, the convex segment 1211 is clamped into the concave segment 2111, at this time, the liner 20 is assembled with the cup 10, and the anti-rotation protrusion 2211 and the anti-rotation groove 1411 are automatically aligned and attached.

According to the acetabular cup assembly 100 provided by the invention, the second locking part 211 is arranged on the convex part 21, and the first locking part 121 is arranged on the concave part 12, so that before the second locking part 211 and the first locking part 121 are mutually matched, the convex part 21 and the concave part 12 are firstly aligned, and then the second locking part 211 and the first locking part 121 are mutually matched, so that multiple alignments between the convex part 21 and the concave part 12 are avoided, and the assembly difficulty between the liner 20 and the cup body 10 is greatly reduced.

The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

The above examples illustrate only a few embodiments of the invention, which are described in detail and are not to be construed as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.

Claims

1. An acetabular cup assembly, comprising:

-a cup (10), the cup (10) having a cup inner surface (14) defining an interior space and a cup outer surface (13) defining an exterior surface, an end surface (11) connecting the cup inner surface (14) and the cup outer surface (13), and an apex of the cup inner surface (14) remote from the end surface (11);

One or more concave parts (12) are arranged on the inner surface (14) of the cup body and are adjacent to the end surface (11), the concave parts (12) extend to the end surface (11), and a first locking part (121) is arranged on the side surface of the concave parts (12);

A pad (20), the pad (20) having a pad outer surface (22) defining an outer surface and a pad end surface (23), the pad outer surface (22) being provided with one or more protrusions (21) adjacent to the pad end surface (23), the protrusions (21) extending to the pad end surface (23), the protrusions (21) being provided with second locking portions (211) on sides thereof;

When the liner (20) is installed in the cup (10), the protrusion (21) and the recess (12) are adapted to achieve circumferential spacing between the cup (10) and the liner (20), and axial spacing between the liner (20) and the cup (10) is achieved by the first locking portion (121) cooperating with the second locking portion (211);

The first locking portion (121) is a concave section (2111) formed toward the inside of the cup body, and the second locking portion (211) is a convex section (1211) formed toward the outside of the pad (20);

Or the first locking portion (121) is a convex section (1211) formed towards the outside of the cup body, and the second locking portion (211) is a concave section (2111) formed towards the inside of the pad (20);

The concave section (2111) comprises a first plane section (2111 a), the convex section (1211) comprises a second plane section (1211 a) and a first elliptical arc section (1211 b) connected with the second plane section (1211 a), the ratio of the radius of the first elliptical arc section (1211 b) to the radius of the second plane section (1211 a) is set to be a first preset value, and when the convex section (1211) is clamped into the concave section (2111), the first plane section (2111 a) and the second plane section (1211 a) are tightly adhered.

2. The acetabular cup assembly of claim 1, wherein a first guide section (2112) is provided on a side of the recess (12) adjacent to the end face (11);

A second guide section (1212) is arranged on the side surface of the protruding part (21) adjacent to the end surface of the pad;

the second guide section (1212) is engageable with the first guide section (2112) to guide the male section (1211) into the female section (2111).

3. The acetabular cup assembly of claim 1 wherein a first anti-rotation portion (141) is provided on the cup inner surface (14) proximate to the apex and a second anti-rotation portion (221) is provided on the liner outer surface (22);

The first anti-rotation portion (141) cooperates with the second anti-rotation portion (221) to define a non-axial movement between the liner (20) and the cup (10) when the liner (20) is installed in the cup (10).

4. The acetabular cup assembly of claim 3 wherein the first anti-rotation portion (141) is a plurality of anti-rotation grooves (1411) and the second anti-rotation portion (221) is a plurality of anti-rotation protrusions (2211);

Or the first anti-rotation part is provided with a plurality of anti-rotation protrusions (2211), and the second anti-rotation part (221) is provided with a plurality of anti-rotation grooves (1411).

5. Acetabular cup assembly according to claim 4, wherein the angle (α) between adjacent recesses (12) is the same about the central axis of the cup (10).

6. The acetabular cup assembly of claim 5 wherein adjacent anti-rotation grooves (1411) have the same included angle (β) about a central axis of the cup (10).

7. The acetabular cup assembly of claim 6 wherein an included angle (α) between adjacent recesses (12) about a central axis of the cup (10) is a multiple of an included angle (β) between adjacent anti-rotation grooves (1411) about the central axis of the cup (10).

8. The acetabular cup assembly of claim 4 wherein the anti-rotation groove (1411) and the anti-rotation protrusion (2211) are each disposed in an annular configuration.

9. The acetabular cup assembly of claim 1 wherein the liner (20) is clearance fit between the cup inner surface (14) and the liner outer surface (22) when installed in the cup (10).