CN111513894A - Acetabular cup - Google Patents

Abstract

The present disclosure relates to an acetabular cup including an acetabular cup body and a plurality of ring teeth; the plurality of ring teeth are arranged on the outer surface of the mortar cup body; in two adjacent ring teeth, the distance from the tooth crest of the ring tooth far away from the cup opening of the mortar cup body to the spherical surface where the outer surface of the mortar cup body is located is larger than the distance from the tooth crest of the ring tooth close to the cup opening of the mortar cup body to the spherical surface where the outer surface of the mortar cup body is located. Through in making two adjacent ring teeth, keep away from the distance of the top of the ring tooth of acetabular cup body rim of a cup to acetabular cup body surface place sphere is greater than and is close to the distance of the top of the ring tooth of acetabular cup body rim of a cup to acetabular cup body surface place sphere for the pressure that the ring tooth formed presses the space and upwards crescent from the rim of a cup, increased the pressure and joined in marriage the volume and make the effort gradual increase of acetabular bone to the ring tooth, solved acetabular cup fixed insecure, easy the taking off of acetabular cup or the problem of skew correct position in operation or recovered process, stable fixed acetabular cup from the acetabular bone inboard.

Description

Acetabular cup

Technical Field

The disclosure relates to the technical field of medical equipment, in particular to an acetabular cup.

Background

In hip replacement, an acetabular liner needs to be fixed to the acetabulum using an acetabular cup as a medium. Whether the acetabular cup can be fixed on the acetabulum firmly for a long time or not is the key for determining whether the acetabular operation is successful or not.

Currently, acetabular cups are mainly fixed by screw fixation, bone cement fixation, or by spraying titanium coatings, etc. However, the screws, the bone cement and the sprayed titanium coating often cause the acetabular cup to be separated or to be shifted from the right position during the operation or the rehabilitation process due to reasons of poor combination with human bone and the like.

It is to be noted that the information disclosed in the above background section is only for enhancement of understanding of the background of the present disclosure, and thus may include information that does not constitute prior art known to those of ordinary skill in the art.

Disclosure of Invention

The present disclosure is directed to providing a socket for an acetabular cup that overcomes, at least to some extent, the problem of the acetabular cup being prone to come off or shift from a correct position during surgery or rehabilitation due to the insecure fixation of the acetabular cup in the related art.

According to the present disclosure there is provided an acetabular cup comprising:

a mortar cup body;

the plurality of ring teeth are arranged on the outer surface of the mortar cup body; in two adjacent ring teeth, the distance from the tooth crest of the ring tooth far away from the cup opening of the mortar cup body to the spherical surface where the outer surface of the mortar cup body is located is larger than the distance from the tooth crest of the ring tooth close to the cup opening of the mortar cup body to the spherical surface where the outer surface of the mortar cup body is located.

According to an embodiment of the disclosure, the outer diameter of the ring tooth far away from the cup opening of the cup body is smaller than or equal to the outer diameter of the ring tooth near the cup opening of the cup body.

According to an embodiment of the present disclosure, the cup body is hemispherical, the addendum of the plurality of ring teeth is located on a first circular arc on a first cross section, the first cross section is a cross section perpendicular to a cup mouth surface of the cup body, and a center of the first circular arc does not coincide with a center of a sphere of the cup body.

According to an embodiment of the present disclosure, the tooth tops of the ring teeth are located on a conical surface or an ellipsoidal surface.

According to an embodiment of the present disclosure, a cross-section of the ring tooth in a plane perpendicular to the rim of the cup body and passing through the center of the sphere of the cup body is triangular, and a side surface of the ring tooth close to the rim of the cup body is parallel to a plane where the rim of the cup body is located.

According to an embodiment of the present disclosure, the roots of the plurality of ring teeth are located on the same spherical surface.

According to an embodiment of the present disclosure, the number of the ring teeth is 2 to 10.

According to an embodiment of the present disclosure, a distance from a crest of each of the plurality of ring teeth to a spherical surface on which an outer surface of the cup body is located is 0.1 mm to 2 mm.

According to an embodiment of the present disclosure, the tooth crest difference between two adjacent ring teeth is 0.1 mm to 2 mm, the tooth crest difference is the difference between the distance from the tooth crest of the first ring tooth to the spherical surface of the outer surface of the mortar cup and the distance from the tooth crest of the second ring tooth to the spherical surface of the outer surface of the mortar cup, the first ring tooth is two adjacent ring teeth far away from the cup rim of the mortar cup in the ring teeth, and the second ring tooth is two adjacent ring teeth close to the cup rim of the mortar cup in the ring teeth.

According to an embodiment of the present disclosure, the tooth top difference between any two adjacent ring teeth of the plurality of ring teeth is equal.

The acetabular cup provided by the embodiment of the disclosure comprises an acetabular cup body and a plurality of ring teeth arranged on the acetabular cup body, wherein the distance from the tooth crest of the ring tooth far away from the rim of the acetabular cup body to the spherical surface of the outer surface of the acetabular cup body is greater than the distance from the tooth crest of the ring tooth near the rim of the acetabular cup body to the spherical surface of the outer surface of the acetabular cup body, so that the press-fit space formed by the ring teeth is gradually increased upwards from the rim, and the press-fit amount is gradually increased therewith, thereby pressing bones far away from the rim of the acetabular cup body more tightly. An annular area with higher pressure to the acetabular cup is formed on the inner side of the acetabulum, enough holding force is provided for the acetabular cup from all directions, the acetabular cup is fixed more stably from the inner side of the acetabulum, the problems that the acetabular cup is not fixed firmly and is easy to separate or deviate from the correct position in the process of operation or rehabilitation are solved, and the acetabular cup is fixed stably from the inner side of the acetabulum. And the processing technology is simple, and compared with the traditional technology, the processing difficulty is not increased.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and together with the description, serve to explain the principles of the disclosure. It is to be understood that the drawings in the following description are merely exemplary of the disclosure, and that other drawings may be derived from those drawings by one of ordinary skill in the art without the exercise of inventive faculty.

Fig. 1 is a schematic structural view of a first acetabular cup provided in an exemplary embodiment of the disclosure.

Fig. 2 is a partial enlarged view at I in fig. 1.

Fig. 3 is a schematic structural view of a second acetabular cup provided in an exemplary embodiment of the disclosure.

Fig. 4 is a partial enlarged view of the point ii in fig. 3.

FIG. 5 is a schematic view of an acetabular cup assembly provided by exemplary embodiments of the disclosure.

FIG. 6 is a schematic view of an acetabular cup ring tooth provided in accordance with exemplary embodiments of the present disclosure.

Fig. 7 is a partial enlarged view of V in fig. 6.

In the figure:

100: a mortar cup body;

110: a cup mouth;

200: ring teeth;

300: acetabular bone;

310: a press-fit area;

320, a first step of mixing; cortical bone;

330: cancellous bone.

Detailed Description

Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and thus their detailed description will be omitted.

Although relative terms, such as "upper" and "lower," may be used in this specification to describe one element of an icon relative to another, these terms are used in this specification for convenience only, e.g., in accordance with the orientation of the examples described in the figures. It will be appreciated that if the device of the icon were turned upside down, the element described as "upper" would become the element "lower". When a structure is "on" another structure, it may mean that the structure is integrally formed with the other structure, or that the structure is "directly" disposed on the other structure, or that the structure is "indirectly" disposed on the other structure via another structure.

The terms "a," "an," "the," "said" are used to indicate the presence of one or more elements/components/etc.; the terms "comprising" and "having" are intended to be inclusive and mean that there may be additional elements/components/etc. other than the listed elements/components/etc.; the terms "first," "second," and the like are used merely as labels, and are not limiting on the number of their objects.

In hip replacement, an acetabular liner needs to be fixed to the acetabulum using an acetabular cup as a medium. Whether the acetabular cup can be fixed on the acetabulum firmly for a long time or not is the key for determining whether the acetabular operation is successful or not.

The present exemplary embodiment provides an acetabular cup, as shown in fig. 1, including an acetabular cup body 100 and a plurality of ring teeth 200; a plurality of ring teeth 200 are arranged on the outer surface of the mortar cup body 100; in two adjacent ring teeth 200, the distance from the tooth crest of the ring tooth 200 far away from the cup opening 110 of the cup body 100 to the spherical surface where the outer surface of the cup body 100 is located is greater than the distance from the tooth crest of the ring tooth 200 close to the cup opening 110 of the cup body 100 to the spherical surface where the outer surface of the cup body 100 is located.

The acetabular cup provided by the embodiment of the disclosure comprises an acetabular cup body 100 and a plurality of ring teeth 200 arranged on the acetabular cup body 100, wherein the distance from the tooth crest of the ring tooth 200 far away from the cup rim 110 of the acetabular cup body 100 to the spherical surface of the outer surface of the acetabular cup body 100 is larger than the distance from the tooth crest of the ring tooth 200 close to the cup rim 110 of the acetabular cup body 100 to the spherical surface of the outer surface of the acetabular cup body 100, so that the press-fit space formed by the ring teeth 200 is gradually increased upwards from the cup rim, and the press-fit amount is gradually increased therewith, thereby pressing bones far away from the cup rim position of the acetabular cup body 100 more tightly. An annular area with higher pressure to the acetabular cup is formed on the inner side of the acetabulum, enough holding force is provided for the acetabular cup from all directions, the acetabular cup is fixed more stably from the inner side of the acetabulum, the problems that the acetabular cup is not fixed firmly and is easy to separate or deviate from the correct position in the process of operation or rehabilitation are solved, and the acetabular cup is fixed stably from the inner side of the acetabulum. And the processing technology is simple, and compared with the traditional technology, the processing difficulty is not increased.

In an example, the height of the ring teeth 200 located away from the cup rim 110 of the cup body 100 is greater than the height of the ring teeth 200 located close to the cup rim 110 of the cup body 100, which is the distance from the tooth root to the tooth tip of the ring teeth 200. Wherein, the one end that the ring gear 200 is close to mortar cup 100 is the ring gear 200 tooth root, and the one end of keeping away from mortar cup 100 is the addendum, and the tooth root of a plurality of ring gears 200 is located same sphere, and this sphere with mortar cup 100 is concentric. Alternatively, the spherical surface is a spherical surface on which the outer surface of the cup body 100 is located.

The components of the acetabular cup provided by the embodiments of the present disclosure will be described in detail below:

as shown in fig. 2, the outer diameter of the ring tooth 200, which is far from the cup rim 110 of the cup body 100, of two adjacent ring teeth 200 is smaller than or equal to the outer diameter of the ring tooth 200, which is near to the cup rim 110 of the cup body 100. Wherein, the outer diameter of the ring gear 200 is the outer diameter of the ring structure formed by the tooth top of the ring gear 200. The diameters of the tooth tops of the ring teeth 200 are sequentially reduced from near to far from the cup mouth 110 of the mortar cup body 100.

Illustratively, as shown in fig. 5, the cup body 100 has a hemispherical shape, and the outer surface thereof has a hemispherical shape, and the plurality of ring teeth 200 are formed around the spherical surface. The outer diameter of the ring tooth 200 of the plurality of ring teeth 200 near the cup rim 110 of the mortar cup 100 is the largest, that is, the outer diameter of the lowermost ring tooth 200 in the drawing is the largest. In actual use, the acetabular cup is pressed into the acetabular bone 300, the lowermost ring teeth 200 contact with the cortical bone 320, the rest ring teeth 200 contact with the cancellous bone 330 in the acetabulum, and the ring teeth 200 and the cancellous bone 330 interact to achieve the purpose of fixing the acetabular cup. The outer diameter of the ring gear 200 far away from the acetabular cup rim 110 is smaller than the diameter of the ring gear 200 close to the acetabular cup rim 110, so that the phenomenon that the ring gear 200 excessively extrudes cortical bone 320 of the acetabulum during installation to cause damage to the cortical bone 320 is avoided, and the driving/fixing effect is influenced.

According to the acetabular cup provided by the embodiment of the disclosure, the distance from the tooth tops of the ring teeth 200 to the spherical surface of the outer surface of the acetabular cup body 100 is gradually increased, the ring teeth 200 protruding above the ring teeth can press cancellous bones 330 outside the ring teeth 200 above the acetabular cup more compactly without increasing the striking force during implantation, and after the bones are compacted, an annular area with higher pressure on the acetabular cup is formed on the inner side of the acetabulum, so that sufficient holding force is provided for the acetabular cup from all directions, and the acetabular cup is fixed more stably.

It should be noted that, the acetabular cup in the embodiment of the present disclosure is a hemispherical shape, and may be a half hollow sphere, or a hollow sphere smaller than a half hollow sphere, or a hollow sphere larger than a half hollow sphere, which is not specifically limited in the embodiment of the present disclosure.

In a first possible implementation manner provided by the disclosed embodiment, as shown in fig. 3 and 4, the tooth tops of the plurality of ring teeth 200 are located on a first circular arc R2 on a first cross section, the first cross section is a cross section perpendicular to the cup rim 110 surface of the cup body 100, and the spherical center of the first spherical surface R2 and the spherical center of the outer surface R1 of the cup body 100 are not coincident. For example, the first cross-section may be a cross-section through the center of the socket cup 100 and perpendicular to the face of the cup mouth 110. At this time, the diameter of the first circular arc R2 is larger than the diameter of the outer surface R1 of the cup 100, and the first circular arc R2 is located between the outer surface R1 of the cup 100 and the cylindrical surface L1 on which the addendum of the first ring tooth 200 is located.

Illustratively, as shown in fig. 3, a height HA of the center of the first arc R2 from the cup mouth 110 of the cup body 100 is less than or equal to a height HB of the center of the sphere of the cup body 100 from the cup mouth 110 of the cup body 100, so that teeth formed by the tip of the arc R2 are gradually retracted upwards, the tooth crest diameter of the upper ring tooth 200 is prevented from being larger than the tooth crest diameter of the lower ring tooth, and the resistance of driving the acetabular cup is increased, particularly the cortical bone 320 at the outermost layer of the acetabulum is damaged when the acetabular cup is not completely driven.

Related art provides an acetabular cup, which includes a plurality of spherical ring teeth, wherein the tooth tops of the plurality of spherical ring teeth are located on a spherical surface, and the spherical surface and the acetabular cup body are concentric. As shown in fig. 6 and 7, in contrast to the related art, embodiments of the present disclosure provide an increased amount of compaction of cancellous bone 330 by acetabular cup ring teeth 200, wherein the increased amount is calculated as follows:

Δ Si ═ Li × Hi/2- (Li- Δ Li) × (Hi- Δ Hi)/2, where:

li is the horizontal direction of the ith ring gear of the acetabular cup, and the tooth top of the ring gear provided by the embodiment of the disclosure exceeds the length of the outer contour part of the acetabular cup body;

the delta Li is the horizontal direction of the ith ring tooth of the acetabular cup, and the tooth top of the ring tooth provided by the embodiment of the disclosure exceeds the length of the spherical ring tooth structure;

(Li-Delta Li) is the length of the part of the tooth top of the spherical ring tooth exceeding the outer contour of the acetabulum outer cup in the horizontal direction of the ith ring tooth of the acetabulum cup;

hi is the height of a bone pressed below the ith ring tooth provided by the embodiment of the disclosure in the vertical direction of the acetabular cup;

Δ Hi is the vertical direction of the acetabular cup, and the bone press-fit height below the ith ring tooth of the ring tooth provided by the embodiment of the disclosure is increased compared with the bone press-fit height below the ith spherical ring tooth of the related art;

delta Si is the unilateral cross section of the ith ring tooth of the acetabular cup, and the ring tooth provided by the embodiment of the disclosure has an increased press-fit area with cancellous bone compared with the spherical ring tooth in the related technology;

the added press-fit volume Δ Vi of a single ring tooth is Δ Si × Ci, where Ci is the circumference of the ith ring tooth.

When the acetabular cup includes n ring teeth, the total press fit volume is:

wherein V is the total press-fit volume, and Δ Vi is the press-fit volume added by the ith ring tooth.

It should be noted that, in fig. 6 and fig. 7, the fourth ring gear 200 is taken as an example, the structures of other gears are similar to the fourth ring gear 200, and a description thereof is not repeated in the embodiment of the present disclosure.

In a second possible implementation manner provided by the embodiment of the present disclosure, the tooth tops of the ring teeth 200 are located on a conical surface. The conical surface is located between the spherical surface on which the outer surface of the mortar cup 100 is located and the cylindrical surface on which the rim 110 of the mortar cup 100 is located.

In a third possible implementation manner provided by the embodiment of the present disclosure, the tooth tops of the ring teeth 200 are located on an ellipsoid. The ellipsoid is located between the spherical surface on which the outer surface of the cup body 100 is located and the cylindrical surface on which the rim 110 of the cup body 100 is located.

In another embodiment, the tooth tops of the ring teeth 200 may be located on an irregular slope. As long as the plane formed by the tooth tops of the plurality of ring teeth 200 is located between the spherical surface of the outer surface of the cup body 100 and the cylindrical surface of the cup mouth 110 of the cup body 100.

The plane of the plurality of ring teeth 200 is parallel to the plane of the cup rim 110 of the mortar cup 100. In practical applications, the rim 110 of the acetabular cup may have a planar structure, or may have a combination of a plurality of planar or curved surfaces. In the embodiment of the present disclosure, when the cup rim 110 of the mortar cup 100 is a planar structure, the plane where the cup rim 110 of the mortar cup 100 is located is the only plane; when the cup mouth 110 of the cup body 100 is formed by combining a plurality of planes or curved surfaces, the plane where the cup mouth 110 of the cup body 100 is located may be one of the plurality of planes, for example, a plane where the diameter of the cup mouth 110 of the hemispherical cup body 100 is the largest. The plane in which the ring gear 200 lies may be in the plane in which the dedendum or addendum circle of the ring gear 200 lies.

Illustratively, the cross-section of the ring gear 200 in a plane perpendicular to the cup mouth 110 of the cup body 100 and passing through the spherical center of the cup body 100 is a triangle, and the vertex of the triangle, or the tooth crest, may be a tip or a rounded end. One side surface of the ring gear 200 close to the cup opening 110 of the mortar cup body 100 is parallel to the plane of the cup opening 110 of the mortar cup body 100. Or the included angle between one side surface of the ring gear 200 close to the cup opening 110 of the mortar cup body 100 and the plane of the cup opening 110 of the mortar cup body 100 is an acute angle.

Alternatively, the roots of the plurality of ring teeth 200 are located on the same spherical surface, which may be the outer surface of the cup body 100 or a spherical surface concentric with the cup body 100, and the diameter of the spherical surface may be the same as or different from the diameter of the outer surface of the cup body 100, which is not specifically limited in this embodiment of the present disclosure. Of course, the heels of the plurality of ring teeth 200 may also be located on different spherical surfaces.

It is noted that the height of the ring gear 200 is a distance from a tooth root of the ring gear 200, which is the farthest end of the ring gear 200 from the cup 100, to a tooth crest, which is the end of the ring gear 200 in surface contact with the cup 100. For the plurality of ring teeth 200, the distance from the tooth top to the tooth bottom refers to the distance from the respective tooth top to the corresponding position of the respective tooth bottom, for example, when the cross section of the ring tooth 200 is a triangle, the distance from the tooth top to the tooth bottom may be any one of two sides drawn from the point of the tooth top in the cross-sectional triangle. In contrast, the distance from the tooth root of the ring tooth 200 to the tooth tip is, of course, the distance from the tooth tip of the ring tooth 200 to the apex of the cup body 100 close to the cup opening 110, or the distance from the tooth root of the ring tooth 200 to the tooth tip is the distance from the tooth tip of the ring tooth 200 to the apex of the cup body 100 remote from the cup opening 110.

The number of the ring teeth 200 on the acetabular cup can be 2-10, specifically 2, 3, 4, 5 or 6. Of course, in practical applications, the number of the acetabular cup ring teeth 200 may be other, such as 8 or 10, and the like, and the embodiments of the present disclosure are not limited thereto.

The distance from the tooth crest of each ring tooth 200 of the plurality of ring teeth 200 to the spherical surface on which the outer surface of the cup body 100 is located may be 0.1 mm to 2 mm, and specifically may be 0.1 mm, 0.5 mm, 0.7 mm, 1.0 mm, 1.5 mm, 1.8 mm, 2.0 mm, and the like.

The tooth crest difference between two adjacent ring teeth 200 may be 0.1 mm to 2 mm, and specifically may be 0.1 mm, 0.2 mm, 0.4 mm, 0.8 mm, 1.2 mm, 1.4 mm, 2.0 mm, and the like. The tooth top difference is the difference between the distance from the tooth top of the first ring tooth to the spherical surface of the outer surface of the mortar cup body 100 and the distance from the tooth top of the second ring tooth to the spherical surface of the outer surface of the mortar cup body 100, the first ring teeth are two adjacent ring teeth far away from the cup mouth 110 of the mortar cup body 100, and the second ring teeth are two adjacent ring teeth near the cup mouth of the mortar cup body 100.

The tooth top difference between any two adjacent ring teeth 200 of the plurality of ring teeth 200 may be equal. In practical applications, of course, the tooth top difference between any two adjacent ring teeth 200 in the plurality of ring teeth 200 may also gradually increase or decrease along a direction away from the cup rim 110, or be randomly distributed, which is not specifically limited in this disclosure.

The acetabular cup 100 may include an outer cup and an inner cup, the ring gear 200 may be disposed on a surface of the outer cup, and the acetabular cup 100 may further include a mounting hole, an axis of the mounting hole generally passing through a spherical center of the hemisphere. During manufacturing, the ring tooth 200 and the cup body 100 may be integrally formed, such as by casting or 3D printing, or the ring tooth 200 and the cup body 100 may be separately formed and then connected. Cup 100 and ring tooth 200 may be made from many different materials, including titanium, cobalt chromium, stainless steel, ceramic, or other biocompatible materials. The cup body 100 and the ring gear 200 may be made of the same or different materials, the cup body 100 may be provided with a coating, and the outer coating may be porous and may be made of titanium, cobalt chromium, a polymer or other biocompatible materials. Further, the acetabular cup may be made from a combination of different biocompatible materials. For example, the cup body 100 may be made of a diamond chrome material, while the porous coating on the outer wall is made of titanium metal.

In use, the acetabular cup may be placed within the acetabulum of the pelvic bone. The acetabular cup is substantially hemispherical or dome shaped so that it can be implanted with a standard hemispherical reamer. The artificial femoral head is placed in the joint socket of the acetabular cup. The femoral head extends from an artificial femoral stem that has been placed within the patient's femur. It should be understood that: artificial femoral heads and femoral stems are not required and native femoral heads or resurfaced femoral heads placed in acetabular cups may be used. The femoral head is placed in a joint socket of the acetabular cup. After the acetabular cup is implanted into a human body, the holding force of the acetabular cup is mainly realized by the press fit amount between the ring teeth 200 and the cancellous bone 330. The height of the ring teeth 200 on the acetabular cup is increased, the contact area between the ring teeth and bones is increased, and the stability of the implanted acetabular cup can be effectively increased.

Other embodiments of securing the acetabular cup to the acetabulum may include press fitting the acetabular cup into the acetabulum, and heating the acetabular cup may occur prior to placement of the acetabular cup into the acetabulum, thereby allowing the acetabular cup to expand after it has cooled within the acetabulum.

As shown in fig. 5, the acetabular cup provided by the embodiment of the disclosure can press the bone closer to the upper teeth, an annular press-fit area 310 with higher pressure to the acetabular cup is formed on the inner side of the acetabulum, sufficient holding force is provided for the acetabulum and the acetabular cup from all directions, and the acetabular cup is fixed more stably from the inner side of the acetabulum; the diameter of the lower edge part of the acetabulum outer cup is unchanged, so that cortical bone 320 at the outer edge of the acetabulum cannot be excessively extruded, and the driving/fixing effect is influenced; the distance between the tooth root of the upper ring gear 200 of the acetabular cup and the concave surface of the acetabular cup is not changed, so that the wall thickness of the acetabular cup is not influenced, and the phenomenon that the wall thickness of the acetabular cup is deformed in subsequent processes such as spraying a coating and the like or is damaged by knocking when being implanted into a human body is avoided, particularly under the condition that the outer wall of the acetabular cup with a small specification is very thin.

Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure disclosed herein. This application is intended to cover any variations, uses, or adaptations of the disclosure following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.

It will be understood that the present disclosure is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is to be limited only by the terms of the appended claims.

Claims (10)

1. An acetabular cup, comprising:

a mortar cup body;

the plurality of ring teeth are arranged on the outer surface of the mortar cup body; in two adjacent ring teeth, the distance from the tooth crest of the ring tooth far away from the cup opening of the mortar cup body to the spherical surface where the outer surface of the mortar cup body is located is larger than the distance from the tooth crest of the ring tooth close to the cup opening of the mortar cup body to the spherical surface where the outer surface of the mortar cup body is located.

2. The acetabular cup of claim 1, wherein an outer diameter of a ring tooth of two adjacent ring teeth that is distal from the cup rim is less than or equal to an outer diameter of a ring tooth that is proximal to the cup rim.

3. The acetabular cup of claim 2, wherein the cup body is hemispherical, wherein the tips of the plurality of ring teeth lie on a first arc in a first cross-section, wherein the first cross-section is a cross-section perpendicular to the cup face of the cup body, and wherein a center of the first arc does not coincide with a center of a sphere of the cup body.

4. The acetabular cup of claim 2 wherein the tips of the plurality of ring teeth are located on a conical surface or an ellipsoidal surface.

5. The acetabular cup of claim 1, wherein the ring tooth has a triangular cross-section in a plane perpendicular to the cup rim and passing through the cup center, and wherein a side of the ring tooth adjacent to the cup rim is parallel to a plane in which the cup rim lies.

6. The acetabular cup of claim 1, wherein roots of the plurality of ring teeth are on the same spherical surface.

7. The acetabular cup of claim 1, wherein the number of ring teeth is 2-10.

8. The acetabular cup of claim 1, wherein a distance from a crest of each of the plurality of ring teeth to a spherical surface on which the cup body outer surface resides is between 0.1 mm and 2 mm.

9. The acetabular cup of claim 1, wherein the crest difference between two adjacent ring teeth is 0.1 mm to 2 mm, the crest difference is the difference between the crest of a first ring tooth and the spherical surface of the outer surface of the cup body and the crest of a second ring tooth and the spherical surface of the outer surface of the cup body, the first ring tooth is the ring tooth of the two adjacent ring teeth that is far from the cup rim, and the second ring tooth is the ring tooth of the two adjacent ring teeth that is close to the cup rim.

10. The acetabular cup of claim 9 wherein any two adjacent ring teeth of the plurality of ring teeth have equal crest differences.

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