CN213030940U - Acetabular prosthesis system - Google Patents

Abstract

The application provides an acetabular prosthesis system, and relates to the technical field of medical instruments. The acetabular prosthesis system includes an acetabular cup having an outer curved surface and an augment component having an inner curved surface that mates with the outer curved surface of the acetabular cup. The acetabular cup sequentially comprises a first substrate and a first bone trabecula outer layer from inside to outside. The augment component includes, in order from the inside out, a second base and a second trabecular-like outer layer. The first and second outer layers of trabecular bone have a porous structure. The outer layer of the bone-like trabecula is similar to the host bone tissue, the outer layer of the bone-like trabecula is arranged on the acetabular cup and the enlarging component respectively, the early formation of the bone tissue can be induced, the early loading capacity of the prosthesis after implantation is improved, after the bone tissue of a human body completely grows in, the outer layer of the bone-like trabecula can ensure the enough bonding strength of the interface of the acetabular prosthesis system and the host bone, the long-term stability of the acetabular prosthesis system in the body is effectively improved, and the deep fusion of the acetabular prosthesis system and the host bone tissue is realized.

Description

Acetabular prosthesis system

Technical Field

The application relates to the technical field of medical equipment, in particular to an acetabular prosthesis system.

Background

In hip replacement surgery, an acetabular cup prosthesis is positioned in the acetabulum and coupled to the patient's hip bone. The acetabular cup generally includes a shell configured to engage the patient's hip bone, and an inner bearing or bushing coupled to the shell and configured to engage the femoral prosthesis. Typically, a portion of the patient's hip bone adjacent the acetabulum is damaged or diseased. These damaged or diseased portions are typically removed by the surgeon and replaced with an augment component. The augment component is typically secured to the patient's hipbone after the shell of the acetabular cup is properly seated and secured to the augment component.

However, current acetabular cup shells and augment components do not achieve good bio-fixation and initial stability.

SUMMERY OF THE UTILITY MODEL

An object of the embodiment of the application is to provide an acetabular prosthesis system, which can improve the technical problem that the acetabular cup and the enlarging component thereof cannot achieve a good biological fixing effect.

In a first aspect, embodiments of the present application provide an acetabular prosthesis system that includes an acetabular cup having an outer curved surface and an augment component having an inner curved surface that mates with the outer curved surface of the acetabular cup.

The acetabular cup sequentially comprises a first substrate and a first bone trabecula outer layer from inside to outside.

The augment component includes, in order from the inside out, a second base and a second trabecular-like outer layer.

The first and second outer layers of trabecular bone have a porous structure.

In the implementation process, the outer layer of the bone-like trabecula is similar to the host bone tissue, the outer layer of the bone-like trabecula is arranged on the acetabular cup and the enlarging component respectively, the early formation of the bone tissue can be induced, the early loading capacity of the prosthesis after implantation is improved, after the bone tissue of a human body completely grows in, the outer layer of the bone-like trabecula can ensure the sufficient bonding strength between the acetabular prosthesis system and the host bone interface, the long-term stability of the acetabular prosthesis system in the body is effectively improved, and the deep fusion of the acetabular prosthesis system and the host bone tissue is realized.

In one possible embodiment, both the first and second trabecular bone shell types have a plurality of pores distributed throughout the interior and the surface.

In the implementation process, the pores in the outer layers and the surfaces of the first type of trabecular bone and the second type of trabecular bone can be communicated with each other to form a bionic transportation channel. The acetabulum cup and the enlarging component can transmit water and organic matters inside the implant through the three-dimensional porous structures communicated with the inside of the first bone trabecula outer layer and the second bone trabecula outer layer, promote the bone tissues to grow inwards to form biological fixation, and enable the acetabulum prosthesis system to be fused with host bone tissues.

In one possible embodiment, the first and second outer trabecular bone layers have a porosity of 40 to 90%.

In the implementation process, when the porosity of the outer layer of the first class of trabecular bone and the porosity of the outer layer of the second class of trabecular bone are 40-90%, the fusion degree of the acetabular prosthesis system and the host bone tissue is good.

In a possible embodiment, the first type of trabecular bone outer layer and the second type of trabecular bone outer layer are both provided with a plurality of irregularly shaped pores distributed on the inner part and the surface, the cross-sectional pore diameter of the pores is 400-1000 μm, and the depth of the pores is more than 1500 μm.

In the implementation process, when the cross-sectional pore diameter of the pores of the first bone trabecular outer layer and the second bone trabecular outer layer is 400-1000 microns, and the depth of the pores is more than 1500 microns, the fusion degree of the acetabular prosthesis system and the host bone tissue is better.

In one possible embodiment, the first and second outer trabecular bone layers have a surface roughness of 2 to 9 μm.

In the implementation process, when the surface roughness of the first bone trabecula outer layer and the second bone trabecula outer layer is 2-9 microns, the acetabular cup and the enlarging component are favorably fixed relatively, the initial stability of the acetabular prosthesis system is ensured, and the acetabular prosthesis system is stably combined with a host bone interface.

In one possible embodiment, the acetabular cup has at least one through first connection hole, the augment component has at least one through second connection hole that mates with the first connection hole, and the acetabular prosthesis system includes a connector for sequentially passing through the first and second connection holes to connect the acetabular cup and the augment component.

In the implementation process, the acetabular prosthesis system sequentially penetrates through the first connecting hole and the second connecting hole through the connecting piece to be connected with the acetabular cup and the enlarging component, and the connecting piece can be further fixed on human bone tissues, so that the initial stable connection between the acetabular prosthesis system and the human bone tissues is realized.

In one possible embodiment, the first substrate has a porous structure.

In the implementation process, the first substrate with the porous structure is beneficial to the transmission of moisture and organic matters in the implanted body, promotes the bone tissues to grow inwards to form biological fixation, and enables the acetabulum prosthesis system to be fused with host bone tissues.

In one possible embodiment, the second substrate has a porous structure.

In the implementation process, the second substrate with the porous structure is beneficial to the transmission of moisture and organic matters in the implanted body, promotes the bone tissues to grow inwards to form biological fixation, and enables the acetabulum prosthesis system to be fused with host bone tissues.

In one possible embodiment, the first substrate and the second substrate are both made of metal.

In a possible embodiment, the first type of trabecular bone outer layer and the second type of trabecular bone outer layer are both made of titanium or titanium alloy.

In the implementation process, the porous titanium is a bionic material which has good biocompatibility and excellent biomechanics, the elastic modulus of the porous titanium is close to that of bone tissues, and the adjustment of the pore structure of the porous titanium can enable the porous titanium to achieve the mechanical property approximately matched with the replaced bone tissues, so that the stress shielding is reduced or eliminated. Meanwhile, the infiltration response of the porous titanium surface layer structure is beneficial to the functional synthesis of bone-like tissues of components in blood. The acetabulum prosthesis system is prepared by adopting a titanium simple substance or a titanium alloy, and the defects of the existing ways of spraying hydroxyapatite, titanium alloy powder and the like on the acetabulum outer cup are overcome.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained from the drawings without inventive effort.

FIG. 1 is a schematic unconnected structural view of an acetabular prosthesis system according to an embodiment of the present disclosure;

FIG. 2 is a schematic view of the acetabular prosthesis system according to an embodiment of the present disclosure after connection;

FIG. 3 is a cross-sectional view of an acetabular cup of an embodiment of the application;

FIG. 4 is a cross-sectional view of an augment component of an embodiment of the present application.

Icon: 10-an acetabular prosthesis system; 100-acetabular cup; 101-a first outer curved surface; 102-a first inner curved surface; 103-a first connection hole; 110-a first substrate; 120-outer layer of trabecular bone of the first type; 200-an enlarging member; 201-a second outer curved surface; 202-a second inner curved surface; 203-second connection hole; 210-a second substrate; 220-outer layer of trabecular bone of the second kind; 300-connecting piece.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. The components of the embodiments of the present application, generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present application, presented in the accompanying drawings, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the present application, it should be noted that the terms "upper", "inner", "outer", and the like refer to the orientation or positional relationship shown in the drawings, or the orientation or positional relationship which the product of the application is usually placed in when used, and are used only for convenience of description and simplification of the description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present application. Furthermore, the terms "first," "second," and the like are used merely to distinguish one description from another, and are not to be construed as indicating or implying relative importance.

In the description of the present application, it is also to be noted that, unless otherwise explicitly specified or limited, the terms "disposed" and "connected" are to be interpreted broadly, e.g., as being either fixedly connected, detachably connected, or integrally connected; either mechanically or electrically. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.

Referring to fig. 1 and 2, an acetabular prosthesis system 10 according to an embodiment of the present disclosure includes an acetabular cup 100 and an augment component 200.

Wherein the acetabular cup 100 prosthesis is for positioning in an acetabulum and is coupled to a human hip bone for engaging an inner bearing or liner of a femoral prosthesis. While the augment component 200 is used to fill the cavity formed by the removed damaged or diseased acetabulum.

That is, both the acetabular cup 100 and augment component 200 need to interface with the host bone. Thus, the bond strength of the acetabular cup 100, augment component 200, and host bone interface is increased, which facilitates increased long-term stability of the acetabular cup 100 system in vivo.

The acetabular cup 100 has a first outer curved surface 101 and the augment component 200 has a second inner curved surface 202, the first outer curved surface 101 and the second inner curved surface 202 cooperating to enable the augment component 200 to be positioned on the acetabular cup 100. The acetabular cup 100 also has a first inner curved surface 102 for engagement to a femur of a human body, and the augment component 200 also has a second outer curved surface 201 for coupling to a hip bone of a human body.

Referring to FIG. 3, the acetabular cup 100 includes, in order from the inside to the outside, a first base 110 and a first trabecular outer layer 120.

The first type of trabecular outer layer 120 is disposed on an outer surface of the first substrate 110, i.e., the first type of trabecular outer layer 120 forms the first outer curved surface 101 and the first inner curved surface 102 of the acetabular cup 100. The first type of trabecular bone outer layer 120 has a porous structure, the first type of trabecular bone outer layer 120 has a plurality of pores distributed in the interior and on the surface, and the plurality of pores in the interior and on the surface are communicated with each other to form a bionic transportation channel for transporting water and organic matters and promoting bone tissues to grow inwards to form biological fixation, so that the acetabular cup 100 is fused with host bone tissues to stabilize the acetabular cup 100 in vivo for a long time.

The first substrate 110 is required to provide some strength to the entire acetabular cup 100.

Optionally, the first substrate 110 is made of metal.

In the embodiment shown in fig. 3, the first substrate 110 is made of a titanium alloy. In other embodiments of the present disclosure, the first substrate 110 may also be made of other alloys or metals that are not repulsive to human bone tissue.

The first substrate 110 may also be a porous structure, and the pores of the first substrate 110 are interconnected. The porous first substrate 110 is adapted to cooperate with the first trabecular outer layer 120 to transport moisture and organic substances inside the implant, promote bone tissue ingrowth to form biological fixation, and allow the acetabular prosthesis system 10 to be fused with host bone tissue.

Optionally, the material of the first substrate 110 is titanium foam.

The first type of trabecular bone outer layer 120 has a porous structure as a whole, and the first type of trabecular bone outer layer 120 is made of titanium or titanium alloy.

In the embodiment shown in fig. 3, the first type of trabecular outer layer 120 is printed from elemental titanium powder by a 3D printing technique. In other embodiments of the present application, the first type of trabecular outer layer 120 may also be made from a powder of titanium alloy by 3D printing techniques or other techniques capable of making porous structures.

The porosity of the outer layer 120 of the first type trabecular bone is 40-90%.

In the embodiment shown in fig. 3, the porosity of the outer layer 120 of trabecular bone of the first type is 60%. In other embodiments of the present disclosure, the porosity of the first trabecular outer layer 120 may also be 40%, 50%, 60%, 65%, 70%, 80%, or 90%.

The pores of the outer layer 120 of the first type of trabeculae are irregular in shape, the cross-sectional aperture of the pores is 400-1000 mu m, and the depth of the pores is more than 1500 mu m.

In the embodiment shown in FIG. 3, the pores of the first type trabecular bone outer layer 120 have a cross-sectional pore size of 400-1000 μm and a depth of > 1500 μm. In other embodiments of the present disclosure, the pores of the first type trabecular bone outer layer 120 may have a cross-sectional pore size of 400-800 μm, 600-1000 μm, 600-800 μm, 400-600 μm, or 600-800 μm, and the depth of the pores may be greater than 1550 μm, > 1600 μm, or > 1700 μm.

The first type of trabecular bone outer layer 120 with a porous structure has good biocompatibility by adjusting and changing the pore structure of the first type of trabecular bone outer layer 120. And the elastic modulus is close to that of bone tissues, and the mechanical property approximately matched with that of replaced bone tissues can be achieved, so that stress shielding is relieved or eliminated.

The surface roughness of the outer layer 120 of the first class trabecular bone is 2-9 mu m.

Optionally, the surface roughness of the first type trabecular bone outer layer 120 is 3-5 μm.

In the embodiment shown in fig. 3, the surface roughness of the outer layer 120 of trabecular bone of the first type is 4 μm. In other embodiments, the surface roughness of the first trabecular bone outer layer 120 may be 2 μm, 3 μm, 5 μm, 6 μm, 7 μm, 8 μm, 9 μm, 2-7 μm, 4-9 μm, 4-7 μm, 3-4 μm, or 4-5 μm.

Referring to fig. 4, the augment component 200 includes, in order from the inside to the outside, a second base 210 and a second trabecular-like outer layer 220.

A second trabecular-like outer layer 220 is disposed on the outer surface of the second substrate 210, i.e., the second trabecular-like outer layer 220 forms the second outer curved surface 201 and the second inner curved surface 202 of the augment component 200. The second type trabecular bone outer layer 220 has a porous structure, the second type trabecular bone outer layer 220 has a plurality of pores distributed in the interior and on the surface, and the plurality of pores on the interior and on the surface are communicated with each other to form a bionic transportation channel for transporting water and organic matters, promoting the bone tissue to grow inwards to form biological fixation, and fusing the augmentation component 200 with the host bone tissue so as to stabilize the augmentation component 200 in vivo for a long time.

The second substrate 210 needs to give a certain strength to the entire augment component 200.

Optionally, the second substrate 210 is made of metal.

In the embodiment shown in fig. 4, the second substrate 210 is made of a titanium alloy. In other embodiments of the present application, the second substrate 210 may also be made of other alloys or metal elements that are not repulsive to human bone tissue.

The second substrate 210 may also be a porous structure, and the pores of the second substrate 210 are interconnected. The porous second substrate 210 is adapted to cooperate with the second trabecular bone-like outer layer 220 to transport moisture and organic substances inside the implant, promote bone tissue ingrowth to form biological fixation, and allow the acetabular prosthesis system 10 to be fused with host bone tissue.

Optionally, the second substrate 210 is made of titanium foam.

The second type of trabecular bone outer layer 220 has a porous structure as a whole, and the second type of trabecular bone outer layer 220 is made of titanium or titanium alloy.

In the embodiment shown in fig. 4, the second type trabecular outer layer 220 is printed from elemental titanium powder by a 3D printing technique. In other embodiments of the present application, the second type trabecular outer layer 220 may also be made of titanium alloy powder by 3D printing techniques or other techniques capable of making porous structures.

The porosity of the second type trabecular bone outer layer 220 is 40-90%.

In the embodiment shown in fig. 4, the porosity of the second trabecular-like outer layer 220 is 60%. In other embodiments of the present disclosure, the porosity of the second trabecular-like outer layer 220 may also be 45%, 55%, 60%, 65%, 75%, 85%, or 90%.

The pores of the second type of trabecular bone outer layer 220 are irregular in shape, the cross-sectional pore diameter of the pores is 400-1000 microns, and the depth of the pores is more than 1500 microns.

In the embodiment shown in FIG. 4, the pores of the second type trabecular outer layer 220 have a cross-sectional pore size of 400-1000 μm and a depth of > 1500 μm. In other embodiments of the present application, the pores of the second type of trabecular bone outer layer 220 may have a cross-sectional pore size of 400-700 μm, 700-1000 μm, 600-800 μm, 400-500 μm, or 700-900 μm, and the depth of the pores may be greater than 1580 μm, > 1650 μm, or greater than 1800 μm.

The second type of trabecular bone outer layer 220 with a porous structure has good biocompatibility by adjusting and changing the pore structure of the second type of trabecular bone outer layer 220. And the elastic modulus is close to that of bone tissues, and the mechanical property approximately matched with that of replaced bone tissues can be achieved, so that stress shielding is relieved or eliminated.

The surface roughness of the second type trabecular bone outer layer 220 is 2-9 μm.

Optionally, the surface roughness of the second type trabecular bone outer layer 220 is 3-5 μm.

In the embodiment shown in fig. 4, the surface roughness of the second trabecular-like outer layer 220 is 4 μm. In other embodiments, the surface roughness of the second trabecular bone-like outer layer 220 may be 2.5 μm, 3.5 μm, 5 μm, 6.5 μm, 7 μm, 8.5 μm, 9 μm, 2-6 μm, 4-8 μm, 3-7 μm, 3-4.5 μm, or 3.5-5 μm.

The acetabular cup 100 has at least one first connection hole 103 therethrough, the augment component 200 has at least one second connection hole 203 therethrough that mates with the first connection hole 103, and the acetabular prosthesis system 10 includes a connector 300.

The connector 300 can be sequentially inserted through the first connection hole 103 of the acetabular cup 100 and the second connection hole 203 of the augment component 200 and finally fixed to the human bone tissue, thereby achieving an initial stable connection of the acetabular prosthesis system 10 to the human bone tissue.

In the embodiment shown in fig. 1-2, the connecting member 300 is a screw, the first connecting hole 103 and the second connecting hole 203 are both circular holes, and the screw can sequentially pass through the first connecting hole 103 and the second connecting hole 203 and is finally fixed on the bone tissue of the human body. In other embodiments of the present application, the first connection hole 103 is a circular hole, the second connection hole 203 is a strip-shaped hole, and the screw can sequentially pass through the first connection hole 103 and the second connection hole 203, and further fixed on the bone tissue of the human body by sliding the position of the enlarged member 200 in the second connection hole 203.

To sum up, the embodiment of the present application provides an acetabular prosthesis system 10, wherein the acetabular cup 100 and the augment component 200 are respectively provided with a trabecular bone-like outer layer similar to a host bone tissue, which can induce early formation of the bone tissue, improve early loading capacity after prosthesis implantation, and after the bone tissue of a human body completely grows in, the trabecular bone-like outer layer can ensure sufficient bonding strength between the acetabular prosthesis system 10 and the host bone interface, effectively improve long-term stability of the acetabular prosthesis system 10 in vivo, and enable the acetabular prosthesis system 10 and the host bone tissue to realize deep fusion.

The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims (10)

1. An acetabular prosthesis system comprising an acetabular cup having an outer curved surface and an augment component having an inner curved surface that mates with the outer curved surface of the acetabular cup;

the acetabulum cup sequentially comprises a first substrate and a first bone trabecula outer layer from inside to outside;

the enlarging component sequentially comprises a second substrate and a second bone trabecula outer layer from inside to outside;

the first and second outer trabecular bone-like layers have a porous structure.

2. The acetabular prosthesis system of claim 1, wherein the first and second trabecular outer layers each have a plurality of pores distributed therein and externally.

3. The acetabular prosthesis system of claim 2, wherein the first and second trabecular outer layers have a porosity of 40-90%.

4. The acetabular prosthesis system of claim 1, wherein the first and second trabecular bone-like outer layers each have a plurality of pores distributed in the interior and on the surface, the pores having a cross-sectional pore size of 400-1000 μm and a depth of > 1500 μm.

5. The acetabular prosthesis system of claim 1, wherein the first and second trabecular outer layers have a surface roughness of 2-9 μ ι η.

6. The acetabular prosthesis system of any one of claims 1-5, wherein the acetabular cup has at least one through first connection hole and the augment component has at least one through second connection hole that mates with the first connection hole, the acetabular prosthesis system including a connector for passing through the first and second connection holes in sequence to connect the acetabular cup and the augment component.

7. The acetabular prosthesis system of any one of claims 1-5, wherein the first substrate has a porous structure.

8. The acetabular prosthesis system of any one of claims 1-5, wherein the second substrate has a porous structure.

9. The acetabular prosthesis system of any one of claims 1-5, wherein the first and second substrates are both metal.

10. The acetabular prosthesis system according to any one of claims 1 to 5, wherein the first trabecular bone shell type and the second trabecular bone shell type are both made of titanium or titanium alloy.

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