CN213963778U - Acetabular cup and acetabular system with same - Google Patents

Abstract

The utility model provides an acetabular cup and have this acetabular cup's acetabular bone system. This acetabular cup includes: an acetabular base having a thickness in a radial direction that increases with increasing stress experienced by the acetabular cup; and the porous layer is sleeved on the porous layer on the outer side of the acetabulum base, and the thickness of the porous layer in the radial direction is reduced along with the increase of stress applied to the acetabulum cup. Through the design that the thicknesses of the acetabulum substrate and the porous layer change along with stress, the overall thickness of the acetabulum cup is reduced under the condition that the overall rigidity of the acetabulum cup is not changed, and meanwhile, the bone growth and bone ingrowth effects can also be ensured. Moreover, on the premise of the same outer diameter of the acetabular cup, the acetabular cup can be adapted to a thicker lining, so that the wear resistance of the lining is improved, the wear loss of the lining is reduced, and the service life of an acetabular system is prolonged.

Description

Acetabular cup and acetabular system with same

Technical Field

The utility model relates to the technical field of medical equipment, especially, relate to an acetabular cup and have acetabular cup's acetabular system.

Background

Hip joint prosthesis replacement is the most effective means for treating hip joint diseases at present, so that patients recover joint physiological functions to a certain extent and pain is relieved. The acetabulum system is an important component of a hip joint prosthesis and mainly comprises a lining and an acetabulum cup, wherein the acetabulum cup is fixed with a hip bone through screws, and the acetabulum cup is fixed with the lining through a specific locking structure to prevent the lining from loosening.

For the prior acetabular cup, the outer surface of the base is spherical, and the thickness distribution is uniform. The inner and outer surfaces of the porous layer are spherical, and the thickness distribution is the same. Therefore, in order to achieve higher acetabular cup stiffness and good bone ingrowth, current acetabular cups are thicker overall, resulting in thinner mating polyethylene liners, which can result in higher wear and reduced long-term hip prosthesis life.

SUMMERY OF THE UTILITY MODEL

In view of the above, it is necessary to provide an acetabular cup with a reduced thickness and an acetabular system having the acetabular cup, in order to solve the problem that the overall thickness of the acetabular cup causes a thin polyethylene liner, which affects the service life.

The above purpose is realized by the following technical scheme:

an acetabular cup, comprising:

an acetabular base having a thickness in a radial direction that increases with increasing stress experienced by the acetabular cup; and

a porous layer sleeved outside the acetabulum base, wherein the thickness of the porous layer in the radial direction is reduced along with the increase of stress applied to the acetabulum cup.

In one embodiment, the thickness and the radial direction of the acetabular base and the porous layer are equal everywhere.

In one embodiment, the outer surface of the porous layer is a part of spherical surface, the inner wall of the porous layer is an aspheric curved surface, and the inner wall of the porous layer is in smooth transition.

In one embodiment, the outer surface of the acetabular base is an aspheric curved surface, and the outer surface of the acetabular base is in smooth transition.

In one embodiment, the bottom region of the inner surface of the acetabular base is a part spherical surface, and the conical surface of the upper region of the inner surface of the acetabular base is a smooth transition between the part spherical surface and the conical surface.

In one embodiment, the spherical center of the acetabular base is offset from the spherical center of the porous layer.

In one embodiment, the edge of the acetabulum base is thickened, and the thickness of the edge of the acetabulum base is 0.1-2 mm higher than the thinnest position of the acetabulum base.

In one embodiment, the acetabulum base is provided with a first mounting hole, and the edge of the first mounting hole is thickened;

the thickness of the edge of the first mounting hole is 0.1-2 mm higher than the thinnest position of the acetabulum base.

In one embodiment, the porous layer is provided with a second mounting hole corresponding to the first mounting hole, and the edge of the second mounting hole is thinned;

the edge of the second mounting hole is 0.1-2 mm lower than the thickest position of the porous layer.

In one embodiment, the pore size and/or porosity of the porous layer is greater at thicker locations than at thinner locations of the porous layer.

In one embodiment, the acetabular base and the porous layer are integrally formed.

An acetabular system comprising a liner and an acetabular cup as in any preceding claim, the liner being fitted in the acetabular cup;

the liner comprises a polyethylene liner or a ceramic liner.

After the technical scheme is adopted, the utility model discloses following technological effect has at least:

the utility model discloses an acetabular cup and have this acetabular cup's acetabular bone system, the porous layer is established to acetabular bone base outside cover, the thickness of acetabular bone base and porous layer along with acetabular bone cup's stress variation, the thickness of acetabular bone base increases along with stress increase, the thickness of porous layer reduces along with stress increase, promptly in the position department that acetabular bone base is thicker, the thickness of porous layer is thinner, in the thinner department of acetabular bone base, the thickness of porous layer is thicker to reduce acetabular bone cup's thickness. Through the thickness with the acetabular bone base with the porous layer design along with the stress variation, effectual solution present acetabular cup whole thickness leads to the polyethylene inside lining thin and influences life's problem, under the unchangeable circumstances of assurance acetabular cup bulk stiffness, reduces acetabular cup's whole thickness, simultaneously, can also guarantee bone length and bone grow into the effect. Moreover, on the premise of the same outer diameter of the acetabular cup, the acetabular cup can be adapted to a thicker lining, so that the wear resistance of the lining is improved, the wear loss of the lining is reduced, and the service life of an acetabular system is prolonged.

Drawings

Fig. 1 is a perspective view of an acetabular cup according to an embodiment of the present invention;

FIG. 2 is a front cutaway schematic view of the acetabular cup shown in FIG. 1;

FIG. 3 is a cut-away perspective view of the acetabular cup shown in FIG. 1;

FIG. 4 is a schematic view of another embodiment of the acetabular cup shown in FIG. 1.

Wherein:

100. an acetabular cup;

110. an acetabular base; 111. a first mounting hole; 112. a bottom region; 113. an upper region;

120. a porous layer; 121. and a second mounting hole.

Detailed Description

In order to make the above objects, features and advantages of the present invention more comprehensible, embodiments of the present invention are described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, as those skilled in the art will be able to make similar modifications without departing from the spirit and scope of the present invention.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like, indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In the present application, unless expressly stated or limited otherwise, the first feature may be directly on or directly under the second feature or indirectly via intermediate members. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

It will be understood that when an element is referred to as being "secured to" or "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 "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.

Referring to fig. 1-3, the present invention provides an acetabular cup 100. The acetabular cup 100 is used in an acetabular system to repair a hip joint through the acetabular system. It is understood that the hip joint is a joint connecting the femur of a human body and the hip bone of the pelvis, and plays an important role in sitting or standing of a human. The hip joint prosthesis is the most effective means for treating hip joint diseases at present, so that the physiological functions of joints of patients are recovered to a certain extent, and pains are relieved. While the acetabular system is an important component of a hip prosthesis.

For the acetabular cup of the prior acetabular system, the outer surface of the base of the acetabular cup is spherical and has equal thickness distribution, and the inner surface and the outer surface of the porous layer are spherical and have equal thickness distribution, so that the overall thickness of the acetabular cup is thicker. Because the whole thickness of the acetabulum system is certain, the thickness of the acetabulum cup is thick, the thickness of the polyethylene lining is thin, the wear resistance of the polyethylene lining is reduced, higher abrasion loss is generated, and the long-term service life of the hip joint prosthesis is reduced.

Therefore, the utility model provides an acetabular cup 100, this acetabular cup 100 can also reduce acetabular cup 100's thickness when guaranteeing that the bone after the prosthesis implantation grows into and goes up the effect with the bone length, still can not influence acetabular cup 100's rigidity. After the acetabular cup 100 is applied to an acetabular system, the thickness of the lining can be increased on the premise of ensuring the thickness of the acetabular system, the wear resistance of the lining is improved, the service life is prolonged, the reliability is ensured, and the use safety of a patient is further improved. The specific structure of the acetabular cup 100 is described in detail below.

In one embodiment, acetabular cup 100 includes acetabular base 110 and porous layer 120. The thickness of the acetabular base 110 in the radial direction increases as the stress experienced by the acetabular cup 100 increases. The porous layer 120 is disposed on the porous layer 120 outside the acetabular base 110, the thickness of the porous layer 120 in the radial direction decreases as the stress on the acetabular cup 100 increases, and the thickness of the acetabular base 110 and the porous layer 120 is equal everywhere in any radial direction.

The acetabular base 110 is the main body portion of the acetabular cup 100, and the acetabular base 110 has a first recess therein for receiving a liner of an acetabular system. The porous layer 120 has a second groove, and the acetabular base 110 is located in the second groove, that is, the porous layer 120 is sleeved on the outer surface of the acetabular cup 100, and the inner wall of the second groove of the porous layer 120 is in contact with the outer wall of the acetabular base 110. The porous layer 120 has an edge that is flush with the edge of the acetabular cup 100.

The porous layer 120 is a porous and dense structure, and the porous layer 120 can provide pores necessary for bone ingrowth and ingrowth. After the prosthesis is implanted, the bone can grow along the pores, and simultaneously, the bone can grow on the surface of the porous layer 120, so that good bone growth and bone growth effects are ensured, further, the fusion of an acetabular system and the body of a patient is ensured, and the recovery effect of the patient is ensured.

Moreover, the thickness of the acetabular base 110 varies progressively with the stress of the acetabular cup 100. That is, the thickness of the acetabular base 110 varies progressively at different locations. It is worth noting that the thickness distribution of the acetabular base 110 of the present invention allows for a topology optimization method to be designed. The thickness of the acetabular base 110 depends on the stress of the deformed base of the acetabular cup 100, and specifically, when the stress of a certain position of the acetabular cup 100 is larger, the thickness of the acetabular base 110 at the position is correspondingly thicker; when the stress is low at a certain location of the acetabular cup 100, the thickness of the acetabular base 110 is correspondingly low. Thus, the local thinning of the acetabulum base 110 is realized on the premise of ensuring the rigidity of the acetabulum base 110.

The thickness of the porous layer 120 also varies progressively with the stress of the acetabular cup 100. That is, the thickness of the porous layer 120 gradually varies at different positions. It is worth noting that the thickness distribution of the porous layer 120 of the present invention is designed to give a topology optimization approach. The thickness of the porous layer 120 depends on the stress level of the deformed base of the acetabular cup 100, and specifically, when the stress level of a certain position of the porous layer 120 is higher, the thickness of the porous layer 120 is correspondingly lower; when the stress is low at a certain position of the acetabular cup 100, the thickness of the porous layer 120 is correspondingly high.

That is, at the same location, the thicker the thickness of the acetabular base 110, the thinner the thickness of the porous layer 120; at the same location, the thinner the thickness of the acetabular base 110, the thicker the thickness of the porous layer 120. That is, a thinner porous layer 120 corresponds to a thicker acetabular base 110, and a thicker porous layer 120 corresponds to a thinner acetabular base 110. Thus, when the acetabular base 110 is installed in the porous layer 120 to form the acetabular cup 100, the overall thickness of the acetabular cup 100 can be reduced while ensuring that the rigidity of the acetabular cup 100 is substantially unchanged to the greatest extent, so that the overall thickness of the acetabular cup 100 is thinner.

According to the acetabular cup 100 of the embodiment, the thickness of the acetabular base 110 and the porous layer 120 is designed along with the stress change, so that the problem that the service life is affected due to the fact that the polyethylene lining is thin due to the overall thickness of the existing acetabular cup is effectively solved, the overall thickness of the acetabular cup 100 is reduced under the condition that the overall rigidity of the acetabular cup 100 is not changed, and meanwhile, the bone ingrowth effect and the bone ingrowth effect can be guaranteed. Moreover, on the premise of the same outer diameter of the acetabular cup 100, the acetabular cup 100 can be adapted to a thicker liner, so that the wear resistance of the liner is improved, the wear loss of the liner is reduced, and the service life of an acetabular system is prolonged.

In one embodiment, the acetabular base 110 is made of a titanium alloy material; the porous layer 120 is also made of a titanium alloy material. Alternatively, the outer layer of the acetabular cup 100, i.e., the porous layer 120, is generally not less than 1mm thick and the inner layer of the acetabular cup 100 is generally not less than 4mm thick. Of course, in other embodiments of the present invention, the thicknesses of the acetabular base 110 and the porous layer 120 may be adjusted, depending on the strength, rigidity, modulus, etc.

In one embodiment, the thickness and orientation of the acetabular base 110 and the porous layer 120 are equal everywhere along any radial direction. That is, the acetabular cup 100 is of uniform thickness, and in any radial direction, the thickness of the acetabular base 110 plus the thickness of the porous layer 120 is equal to the thickness of the acetabular base 110 plus the thickness of the porous layer 120 in the other radial direction. This ensures that the overall thickness of the acetabular cup 100 is consistent, and is suitable for installation of a liner, ensuring that the liner is reliably installed in the acetabular cup 100. Meanwhile, the acetabular cup 100 with the same thickness can not only ensure high strength and improve the use performance of the acetabular cup 100, but also ensure the performance requirements of bone ingrowth and bone growth.

In one embodiment, the inner wall of the acetabular base 110 is partially spherical and the outer surface of the acetabular base 110 is aspheric. The outer surface of the porous layer 120 is a partial spherical surface, and the inner wall of the porous layer 120 is an aspherical curved surface. That is, the inner wall of the acetabular base 110 is spherical, the outer surface of the porous layer 120 is spherical, and the aspheric curved surface of the inner wall of the porous layer 120 and the aspheric curved surface of the outer surface of the acetabular base 110 are closely fitted.

As shown in fig. 2, the dotted line shown in the figure is an extension line of the outer surface of the porous layer 120 and the inner wall of the acetabular base 110, which indicates that both the outer surface and the inner wall of the acetabular cup 100 are spherical surfaces, and the thickness of the porous layer 120 and the thickness of the acetabular base 110 are non-uniformly distributed, so that the inner wall of the porous layer 120 and the outer surface of the acetabular base 110 are arranged in an aspheric surface manner, thereby reducing the thickness of the acetabular cup 100 while satisfying the usability and strength of the acetabular cup 100.

In other embodiments of the present invention, the outer surface of the acetabular base 110 may also be an aspheric surface, that is, the outer surface of the acetabular base 110 may be a spliced shape or a partially concave or convex shape, as long as smooth transition of the outer surface of the acetabular base 110 is ensured.

In one embodiment, as shown in fig. 4, the bottom region 112 of the inner surface of the acetabular base 110 is a partially spherical surface and the upper region 113 of the inner surface of the acetabular base 110 has a tapered surface with a smooth transition between the partially spherical surface and the tapered surface. In this way, liners of different shapes can be installed inside the acetabular base 110 to meet different use requirements. Of course, the upper region of the inner surface of the acetabular base 110 may also be cylindrical, and the like.

In one embodiment, the rim of the acetabular base 110 is thickened. It will be appreciated that the thickness of the acetabular base 110 is related to the stress of the acetabular cup 100, and that the thickness of the acetabular base 110 may be increased where the stress of the acetabular cup 100 is greater. The rim of the acetabular cup 100 is stressed more, so that the rim of the acetabular base 110 is thickened to increase the strength of the acetabular base 110, and further, the rim of the acetabular cup 100 is increased to improve the reliability of the acetabular cup 100.

Further, the thickness of the edge of the acetabular base 110 is 0.1mm to 2mm higher than the thinnest position of the acetabular base 110. That is, the rim of the acetabular base 110 is thickened by 0.1mm to 2 mm. Thickening is referred to herein as the thinnest position relative to the thickness of the acetabular base 110. The rim of the acetabular base 110 may be the thickest portion of the thickness of the acetabular base 110, or may be a thicker portion of the thickness of the acetabular base 110, as long as the rim can bear the stress of the rim portion and meet the strength requirement of the acetabular cup 100. Moreover, the thickness of the rim of the acetabular base 110 may be adjusted according to actual requirements.

Referring to fig. 1-3, in one embodiment, the acetabular base 110 has a first mounting hole 111 and the porous layer 120 has a second mounting hole 121 corresponding to the first mounting hole 111. After the first mounting hole 111 corresponds to the second mounting hole 121, the first mounting hole 111 communicates with the second mounting hole 121 and penetrates the acetabular cup 100 in the radial direction, i.e., communicates the first recess of the acetabular base 110 with the exterior of the porous layer 120. That is, the first mounting hole 111 and the second mounting hole 121 penetrate through the inner and outer layer structure of the acetabular cup 100, and a screw member or the like penetrates through the first mounting hole 111 and the second mounting hole 121 to be connected with the ball head, so that the prosthesis can be mounted and fixed. Optionally, the number of the first mounting holes 111 is multiple, the plurality of first mounting holes 111 are distributed at intervals, and the number of the second mounting holes 121 is equal to the number of the first mounting holes 111 and is arranged corresponding to the first mounting holes 111.

In one embodiment, the first mounting hole 111 is provided with a thickened edge. It will be appreciated that the thickness of the acetabular base 110 is related to the stress of the acetabular cup 100, and that the thickness of the acetabular base 110 may be increased where the stress of the acetabular cup 100 is greater. And the stress that the edge of first mounting hole 111 of acetabular cup 100 received is great, consequently, thickens at first mounting hole 111 edge of acetabular base 110, improves acetabular base 110's intensity, and then improves acetabular cup 100 at the intensity of first mounting hole 111 edge, avoids the back acetabular cup 100 of screw connection to take place to damage, improves acetabular cup 100 reliability of working.

In one embodiment, the thickness of the edge of the first mounting hole 111 is 0.1mm to 2mm higher than the thinnest position of the acetabular base 110. That is, the edge of the first mounting hole 111 of the acetabular base 110 is thickened by 0.1mm to 2 mm. Thickening is referred to herein as the thinnest position relative to the thickness of the acetabular base 110. The edge of the first installation hole 111 of the acetabular base 110 may be the thickest position of the thickness of the acetabular base 110, or may be a thicker position of the thickness of the acetabular base 110, as long as the edge can bear the stress of the edge position and meet the strength requirement of the acetabular cup 100. Moreover, the thickness of the edge of the first mounting hole 111 of the acetabular base 110 may also be adjusted according to actual requirements.

In one embodiment, the thickness of the acetabular base 110 is between 3mm and 5 mm. That is, the thinnest and thickest locations of the thickness of the acetabular base 110 are within the above-described ranges.

Referring to fig. 1-3, in one embodiment, the porous layer 120 is provided with a thinned edge. It will be appreciated that the thickness of the acetabular base 110 is related to the stress of the acetabular cup 100, and that at locations where the stress of the acetabular cup 100 is greater, the thickness of the acetabular base 110 may be increased and the thickness of the porous layer 120 may be decreased. The rim of the acetabular cup 100 is under greater stress, which increases the thickness of the rim of the acetabular base 110, increases the strength of the acetabular base 110, and decreases the thickness of the rim of the porous layer 120, thereby increasing the usability of the acetabular cup 100.

In one embodiment, the edges of the porous layer 120 are 0.1mm to 2mm below the thickest location of the porous layer 120. That is, the porous layer 120 is thinned by 0.1mm to 2mm at the edge. The thinning here refers to a position where the thickness is the thickest with respect to the porous layer 120. The edge of the porous layer 120 may be the thinnest point of the thickness of the porous layer 120 or a thinner point of the thickness of the porous layer 120, as long as the edge can bear the stress at the edge and meet the strength requirement of the acetabular cup 100. Moreover, the thickness of the edge of the porous layer can be adjusted according to the actual use requirement.

In one embodiment, the edges of the second mounting hole 121 are thinned. It will be appreciated that the thickness of the acetabular base 110 is related to the stress of the acetabular cup 100, and that at locations where the stress of the acetabular cup 100 is greater, the thickness of the acetabular base 110 may be increased and the thickness of the porous layer 120 may be decreased. The rim of the acetabular cup 100 is subjected to a larger stress, so that the rim of the acetabular base 110 is thickened to improve the strength of the acetabular base 110, and the rim thickness of the second mounting hole 121 of the porous layer 120 is reduced to improve the usability of the acetabular cup 100.

In one embodiment, the edge of the second mounting hole 121 is 0.1mm to 2mm lower than the thickest position of the porous layer 120. That is, the edge of the second mounting hole 121 of the porous layer 120 is thinned by 0.1mm to 2 mm. The thinning here refers to a position where the thickness is the thickest with respect to the porous layer 120. The edge of the second mounting hole 121 of the porous layer 120 may be the thinnest position of the thickness of the porous layer 120, or may be a thinner position of the thickness of the porous layer 120, as long as the edge can bear the stress at the edge position and meet the strength requirement of the acetabular cup 100. Furthermore, the thickness of the edge of the second mounting hole 121 of the porous layer 120 can be adjusted according to the actual use requirement.

In one embodiment, the thinnest portion and the thickest portion of the outer surface of the acetabular base 110 are rounded. This may ensure that the outer surface of the acetabular base 110 is smooth and forms an aspheric surface. In one embodiment, the thinnest and thickest portions of the inner wall of the porous layer 120 are rounded. This ensures that the outer surface of the porous layer 120 is smooth and forms an aspheric curved surface.

It should be noted that the thickness of the acetabular base 110 varies throughout the outer surface area, being relatively thicker near the end face and the threaded member, and being thinner elsewhere with a smooth transition in thickness. The porous layer 120 varies in thickness throughout the inner surface region, being relatively thinner near the end face and the threaded member, and thicker in other regions, with a smooth transition in thickness.

In one embodiment, the spherical center of the acetabular base 110 is offset from the spherical center of the porous layer 120. That is, whether the inner surface of the acetabular base 110 is a regular partial spherical surface or a shape of a partial spherical surface and a conical surface or the like, the spherical center of the acetabular base 110 is offset from the spherical center of the porous layer 120, which ensures a reliable connection between the acetabular base 110 and the porous layer 120. Further, the spherical center of the acetabular base 110 is offset + - (+ -2 mm-4 mm) from the spherical center of the porous layer 120. Illustratively, the spherical center of the acetabular base 110 is offset from the spherical center of the porous layer 120 by about ± 3 mm.

In one embodiment, the pore size and porosity at thicker locations of porous layer 120 are greater than the pore size and porosity at thinner locations of porous layer 120. That is, with respect to the porous layer 120, the pore size of the porous layer 120 and the thickness of the porous layer 120 vary progressively. The more stress is applied at locations where the porous layer 120 is thinner (i.e., corresponding to locations where the acetabular base 110 is thicker), where the pore size and porosity of the porous layer 120 is lower, to increase the stiffness and strength of the acetabular cup 100. The thicker the porous layer 120 (corresponding to the thinner the acetabular base 110) is, the less stress is when deformed, where the pore size and porosity of the porous layer 120 are higher to enhance the bone ingrowth effect of the porous layer 120. That is, the pore diameter and the porosity of the porous layer 120 gradually change with the gradient distribution of the strength, and the performance requirements of high strength and good bone ingrowth are met.

In one embodiment, the acetabular base 110 and the porous layer 120 are integrally formed. That is, the acetabulum base 110 and the porous layer 120 are integrally formed, so that the reliability of the joint between the acetabulum base 110 and the porous layer 120 can be ensured, and the joint between the acetabulum base and the porous layer is prevented from being broken; meanwhile, the assembling procedures can be reduced, and the use is convenient. Further, the acetabular base 110 and the porous layer 120 are formed by one-time printing in a 3D printing manner.

The utility model discloses an among the acetabular cup 100, based on acetabular cup 100's intensity and rigidity distribution, give acetabular base 110 different thickness, give porous layer 120 different thickness to but give porous layer 120 different aperture porosity, when guaranteeing acetabular cup 100 intensity and rigidity, reduce acetabular cup 100's whole thickness, simultaneously, can also guarantee to go into the effect with the bone length on the bone length. Moreover, on the premise of the same outer diameter of the acetabular cup 100, the acetabular cup 100 can be adapted to a thicker liner, so that the wear resistance of the liner is improved, the wear loss of the liner is reduced, and the service life of an acetabular system is prolonged.

The utility model also provides an acetabular system, acetabular cup 100 including inside lining and above-mentioned any embodiment, the inside lining is installed in acetabular cup 100. The liner comprises a polyethylene liner or a ceramic liner. When the liner is a polyethylene liner, the polyethylene liner is installed directly into the acetabular cup 100. When the liner is a ceramic liner, the acetabular system further includes a metal ring by which the ceramic liner is press fit into the acetabular cup 100. Further, the polyethylene lining can be an ultra-high molecular weight polyethylene lining, a high cross-linked ultra-high molecular weight polyethylene lining, a vitamin E-doped ultra-high molecular weight polyethylene lining, or the like.

The acetabular cup 100 is a main body part of the acetabular system, an outer contour of the acetabular cup 100 is formed into a hemispherical shape, and the interior of the acetabular cup 100 is arranged in a hollow manner and is marked as a first mounting groove. The first mounting groove is used for mounting the lining. The outline of inside lining also is the hemisphere, and the inside of inside lining also is the cavity setting, marks as the second mounting groove. The liner is installed in the first installation slot of acetabular cup 100. The second mounting groove of the lining is used for mounting a ball head, and a femoral stem connected with the ball head extends out of the lining and is used for being connected with the femur of a patient. Optionally, the shape of the acetabular cup 100 and liner may also be ellipsoidal.

In particular, in use, the acetabular cup 100 is installed in a pelvic bone of a patient, the liner is installed in a first mounting slot of the acetabular cup 100, and the ball head is installed in a second mounting slot of the liner. The bulb is connected to the one end of femoral stem, and the one end that this femoral stem kept away from the bulb is connected with patient's thighbone to be fixed in the thighbone. It should be understood that the ball head and femoral stem may be an artificial femur, as well as a native femoral head or a resurfaced femoral head placed in the acetabular system. It should be noted that the installation form of the acetabular system of the present invention is substantially the same as the installation form of the current acetabular structure, and only a brief description is made here without redundant description.

The utility model discloses an acetabular system adopts acetabular cup 100 back of above-mentioned embodiment, because acetabular cup 100's thickness has the attenuate, under the unchangeable condition of acetabular cup 100 external diameter, the thickness of inside lining can corresponding increase to the thicker inside lining of adaptation improves the wear resistance of inside lining, reduces the wearing and tearing volume of inside lining, and then improves acetabular system's life.

The technical features of the embodiments described above can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims (12)

1. An acetabular cup, comprising:

an acetabular base having a thickness in a radial direction that increases with increasing stress experienced by the acetabular cup; and

a porous layer sleeved outside the acetabulum base, wherein the thickness of the porous layer in the radial direction is reduced along with the increase of stress applied to the acetabulum cup.

2. The acetabular cup of claim 1, wherein the thickness and radial direction of the acetabular base and the porous layer are equal everywhere.

3. The acetabular cup of claim 1 wherein an outer surface of the porous layer is partially spherical and an inner wall of the porous layer is aspheric, the inner wall of the porous layer being rounded.

4. The acetabular cup of claim 1, wherein the outer surface of the acetabular base is aspheric and the outer surface of the acetabular base is rounded.

5. The acetabular cup of claim 4, wherein a bottom region of the acetabular base inner surface is a partially spherical surface and an upper region of the acetabular base inner surface has a tapered surface, the smooth transition between the partially spherical surface and the tapered surface.

6. The acetabular cup of any of claims 3-5, wherein a spherical center of the acetabular base is offset from a spherical center of the porous layer.

7. The acetabular cup of any of claims 1-5, wherein the rim of the acetabular base is thickened such that the thickness of the rim of the acetabular base is 0.1mm to 2mm higher than the thinnest point of the acetabular base.

8. The acetabular cup of any of claims 1-5, wherein the acetabular base has a first mounting hole with a thickened rim;

the thickness of the edge of the first mounting hole is 0.1-2 mm higher than the thinnest position of the acetabulum base.

9. The acetabular cup of claim 8 wherein the porous layer has a second mounting hole corresponding to the first mounting hole, the second mounting hole having a reduced rim;

the edge of the second mounting hole is 0.1-2 mm lower than the thickest position of the porous layer.

10. The acetabular cup of claim 1, wherein the pore size and/or porosity of the porous layer is greater at locations where the porous layer is thicker than at locations where the porous layer is thinner.

11. The acetabular cup of any of claims 1-5, wherein the acetabular base and porous layer are machined as one piece.

12. An acetabular system comprising a liner and an acetabular cup according to any one of claims 1 to 9, the liner being fitted in the acetabular cup;

the liner comprises a polyethylene liner or a ceramic liner.

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