Joint prosthesis for hip replacement
By using acetabular cup body made of polyether ether ketone material and applying a metal coating on its outer surface, the problem of releasing metal ions in the existing acetabular cup is solved, and the release of metal ions is reduced and bones is promoted. The effect of tissue growth improves human health and safety.
Patent Information
- Application Number
- CN202420941871.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-30
- Publication Date
- 2025-02-11
- Estimated Expiration
- 2034-04-30
AI Technical Summary
Existing acetabular cups will release a large amount of metal ions when used in the body, which will endanger human health and will be more harmful to people with poor kidney function or pregnancy.
The acetabular cup body made of polyether ether ketone (PEEK) or polyether ether ketone composite material is coated with a metal coating on its outer surface. The metal coating material may be pure titanium, titanium alloy or tantalum metal.
The use of polyether ether ketone materials reduces the micro movement and wear of the lining, and promotes the growth of bone tissue through metal coating, achieving long-term fixation effect, while reducing the release of metal ions and improving human health and safety.
Smart Images
Figure CN222444443U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of medical prostheses, in particular to a joint prosthesis used for hip replacement. Background Art
[0002] Artificial hip replacement is a relatively mature surgery that can effectively help patients with severe hip joint damage improve their lives. The joint prostheses that need to be replaced in hip replacement usually include acetabular cup prosthesis and femoral prosthesis. The acetabular cup prosthesis includes the acetabular cup and liner, and the femoral prosthesis includes the femoral ball head and femoral stem. In order to reduce wear and prolong the retention time of the prosthesis in the body, the existing acetabular cup is usually made of metal materials. Although the acetabular cup and the liner need to be fixed together, they will inevitably produce micro-motion when used in the body, resulting in metal ions produced in long-term friction, which may be harmful to the human body and endanger human health. It is particularly harmful to people with poor kidney function or during pregnancy. Utility Model Content
[0003] The utility model aims to provide a joint prosthesis for hip replacement surgery, which solves the problem that the existing acetabular cup releases a large amount of metal ions that are harmful to human health.
[0004] To achieve this purpose, the utility model adopts the following technical solutions:
[0005] A joint prosthesis for hip replacement surgery includes an acetabular cup body and a metal coating; the acetabular cup body is a polyetheretherketone hemisphere or a polyetheretherketone composite hemisphere, the acetabular cup body is hemispherical, and is formed with an inner surface for installing an acetabular cup liner and an outer surface for installing in the acetabular socket of a human body; an annular lap groove is formed at the inner surface of the acetabular cup body and the port of the acetabular cup body, and the lap groove is used to fix the acetabular cup liner; the metal coating is arranged on the outer surface of the acetabular cup body.
[0006] In one embodiment, the thickness of the metal coating is T1, wherein 20 μm≤T1≤1000 μm.
[0007] In one embodiment, a hydrophilic coating is further included, and the hydrophilic coating is disposed on the outer surface of the metal coating.
[0008] In one embodiment, the thickness of the metal coating is T1, wherein 50 μm ≤ T1 ≤ 900 μm;
[0009] The thickness of the hydrophilic coating is T2, wherein 0 μm<T2≤200 μm.
[0010] In one embodiment, the hydrophilic coating is annular and is located close to the port of the acetabular cup body.
[0011] In one embodiment, an antibacterial coating is further included, and the antibacterial coating is disposed on the outer surface of the hydrophilic coating.
[0012] In one embodiment, the inner surface roughness of the acetabular cup body is Ra≤2 μm.
[0013] In one embodiment, the inner surface of the acetabular cup body includes a conical surface and an inner spherical surface, the inner spherical surface is connected to the conical surface, the conical surface is close to the port of the acetabular cup body, and the acetabular cup body is coaxial with the inner spherical surface and the conical surface.
[0014] In one embodiment, the acetabular cup body has a mounting hole; the mounting hole is a countersunk hole.
[0015] Compared with the prior art, the utility model has the following beneficial effects:
[0016] The acetabular cup body of the utility model technical solution is a hemispherical body made of polyetheretherketone (PEEK) or polyetheretherketone composite material. The material type of the acetabular cup body is similar to that of the general acetabular cup liner, and a circular overlapping groove is formed on the inner surface of the acetabular cup body and the acetabular cup body port, and the overlapping groove is used to fix the acetabular cup liner, and the setting of the overlapping groove reduces the entry of body fluids into the inner surface of the acetabular cup body, reduces the micro-movement of the liner, and slows down the wear of the acetabular cup body or the acetabular cup liner. In addition, polyetheretherketone has excellent wear resistance, corrosion resistance and biocompatibility, which can meet the design requirements of the acetabular cup. A metal coating is coated on the outer surface of the acetabular cup body. The material of the corresponding specific metal coating can be pure titanium, titanium alloy (such as Ti6Al4V, Ti6Al7Nb, etc.), tantalum metal, etc. Accordingly, the metal coating can promote the growth of bone tissue into the acetabular cup to achieve a long-term fixation effect; the metal coating can also improve the strength of the acetabular cup; the metal coating can also make the acetabular cup have a certain antibacterial ability. It can also be understood that the provision of the metal coating reduces the release of metal ions while ensuring the above premise. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.
[0018] The structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification so as to facilitate understanding and reading by persons familiar with this technology. They are not used to limit the conditions under which the present invention can be implemented, and therefore have no substantive technical significance. Any structural modification, change in proportion or adjustment of size, without affecting the effects and purposes that can be achieved by the present invention, should still fall within the scope of the technical contents disclosed by the present invention.
[0019] Figure 1 This is a schematic diagram of the structure of an embodiment of the utility model;
[0020] Figure 2 for Figure 1 A magnified view of part A in FIG.
[0021] Figure 3 A cross-sectional view of an embodiment of the utility model;
[0022] Figure 4 A cross-sectional view of an embodiment of the utility model;
[0023] Figure 5 A cross-sectional view of an embodiment of the utility model;
[0024] Figure 6 A cross-sectional view of an embodiment of the utility model;
[0025] Figure 7 for Figure 6 A magnified view of part B in FIG.
[0026] Figure 8 A schematic structural diagram of another embodiment of the utility model.
[0027] Illustrations: 100, joint prosthesis for hip replacement; 110, acetabular cup body; 112, conical surface; 113, inner spherical surface; 114, plane; 115, plug-in groove; 116, lap groove; 117, mounting hole; 120, metal coating; 130, hydrophilic coating; 130′, hydrophilic coating in ring shape; 140, antibacterial coating. DETAILED DESCRIPTION
[0028] In order to make the technical purpose, features and advantages of the utility model more obvious and easy to understand, the technical scheme in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the embodiment described below is only a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0029] In the description of the present invention, it should be understood that the terms "upper", "lower", "top", "bottom", "inside", "outside", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. It should be noted that when a component is considered to be "connected" to another component, it may be directly connected to the other component or there may be a centrally arranged component at the same time.
[0030] The technical solution of the utility model is further explained below with reference to the accompanying drawings and through specific implementation methods.
[0031] The embodiment of the utility model provides a joint prosthesis 100 for hip replacement.
[0032] See also Figure 1 A joint prosthesis 100 for hip replacement surgery includes an acetabular cup body 110 and a metal coating 120; the acetabular cup body 110 is a polyetheretherketone hemisphere or a polyetheretherketone composite hemisphere, the acetabular cup body 110 is hemispherical, and is formed with an inner surface for installing an acetabular cup liner and an outer surface for installing to the acetabular socket of a human body, and a circular overlapping groove 116 is formed at the inner surface of the acetabular cup body and the port of the acetabular cup body, and the overlapping groove is used to fix the acetabular cup liner; the metal coating 120 is arranged on the outer surface of the acetabular cup body 110.
[0033] It is understandable that the existing acetabular cup body 110 is usually made of metal material, and the acetabular cup liner is generally made of composite material. Since the materials of the two are very different, it is easy to cause the acetabular cup liner composed of composite material to produce serious wear. The acetabular cup body 110 of the utility model technical solution is a hemispherical body made of polyetheretherketone (PEEK) or polyetheretherketone composite material. The material type of the acetabular cup body is similar to that of the general acetabular cup liner, and a circular overlapping groove is formed at the inner surface of the acetabular cup body and the acetabular cup body port. The overlapping groove is used to fix the acetabular cup liner, and the setting of the overlapping groove reduces the body fluid from entering the inner surface of the acetabular cup, reduces the micro-motion of the liner, and slows down the wear of the acetabular cup or the acetabular cup liner. In addition, polyetheretherketone has excellent wear resistance, corrosion resistance and biocompatibility, which can meet the design requirements of the joint prosthesis 100 used for hip replacement. A metal coating 120 is coated on the outer surface of the acetabular cup body 110. The corresponding specific material of the metal coating 120 can be pure titanium, titanium alloy (such as Ti6Al4V, Ti6Al7Nb, etc.), tantalum metal, etc. Accordingly, the metal coating 120 can promote the growth of bone tissue into the joint prosthesis 100 for hip replacement surgery to achieve a long-term fixation effect; the metal coating 120 can also improve the strength of the joint prosthesis 100 for hip replacement surgery; the metal coating 120 can also make the joint prosthesis 100 for hip replacement surgery have a certain antibacterial ability. It can also be understood that the setting of the metal coating 120 reduces the release of metal ions while ensuring the above premise.
[0034] It should be noted that, based on the above embodiments, generally, the material of the acetabular cup liner can be ultra-high molecular weight polyethylene, highly cross-linked ultra-high molecular weight polyethylene, ultra-high molecular weight polyethylene containing antioxidants (such as vitamin E) or highly cross-linked ultra-high molecular weight polyethylene, polycarbonate polyurethane (PCU) and other materials, and can also be made of polyetheretherketone (PEEK) or polyetheretherketone composite materials.
[0035] Please continue reading Figure 1 In a specific embodiment, if the acetabular cup body 110 has only one layer of coating, the thickness of the metal coating 120 is T1, wherein 20 μm≤T1≤1000 μm.
[0036] It is understandable that if the thickness T1 of the metal coating 120 is less than 20 μm, the acetabular cup body 110 cannot be fixed or the fixing effect is poor; if the thickness T1 of the metal coating 120 is greater than 1000 μm, the strength or adhesion of the metal coating 120 is insufficient, and the metal coating 120 may be powdered or sheared to produce cracks during the growth of bone tissue, thereby increasing the content of metal ions in the human body, increasing the burden on the patient's kidneys, and affecting human health.
[0037] Alternatively, the value of T may be 20 μm, 100 μm, 500 μm, 750 μm, or 1000 μm.
[0038] See also Figure 2 In another embodiment of the utility model, the joint prosthesis 100 for hip replacement surgery further includes a hydrophilic coating 130, which is disposed on the outer surface of the metal coating 120. Specifically, in this embodiment, the material of the metal coating 120 can be pure titanium, titanium alloy (such as Ti6Al4V, Ti6Al7Nb, etc.), tantalum metal and other metal materials. The material of the hydrophilic coating 130 is a hydrophilic material such as hydroxyapatite.
[0039] Based on the above embodiment, the thickness of the metal coating 120 is T1, wherein 50 μm≤T1≤900 μm;
[0040] The thickness of the hydrophilic coating 130 is T2, wherein 0 μm<T2≤200 μm.
[0041] It is understandable that if the metal coating 120 or the hydrophilic coating 130 is too thin, the fixing effect is poor; if the metal coating 120 or the hydrophilic coating 130 is too thick, the strength or adhesion of the superimposed coating may be insufficient, causing cracks or powdering of the coating.
[0042] Optionally, the value of T1 may be 50 μm, 150 μm, 200 μm, 500 μm, or 900 μm; the value of T2 may be 10 μm, 100 μm, 120 μm, 150 μm, 180 μm, or 200 μm.
[0043] See also Figure 3 In a preferred embodiment, the hydrophilic coating 130 is in a ring shape 130 ′ and is close to the biological port of the acetabular cup body 110 .
[0044] It can be understood that when the material of the hydrophilic coating 130 is hydroxyapatite, it is coated on the side close to the port of the acetabular cup body 110, which can better induce the fusion of bone tissue and the acetabular cup body 110, and the hydrophilic coating 130 is ring-shaped 130', which reduces the use of the hydrophilic coating 130 material, and makes the metal material of the metal coating 120 directly contact the human bone, thereby reducing the risk of surgical infection.
[0045] Please continue reading Figure 3 and Figure 4 In another embodiment of the present invention, the joint prosthesis 100 for hip replacement surgery further includes an antibacterial coating 140 , and the antibacterial coating 140 is disposed on the outer surface of the hydrophilic coating 130 .
[0046] It is understandable that the material of the antibacterial coating 140 is an antibacterial composition containing silver ions or copper ions or antibiotics.
[0047] Optionally, when the hydrophilic coating 130 is in a ring shape 130 ′, the antibacterial coating 140 is also in a ring shape.
[0048] Optionally, when the hydrophilic coating 130 is in a ring shape 130 ′, the antibacterial coating 140 is coated on the outermost surface of the acetabular cup body 110 .
[0049] It can be understood that the above embodiment has at least three different types of coatings. The metal coating 120 can promote the growth of bone tissue into the acetabular cup body 110 to achieve a long-term fixation effect; the hydrophilic coating 130 can induce bone tissue to grow into the acetabular cup body 110; the antibacterial coating 140 can inhibit the growth of bacteria and reduce the risk of more serious surgical infection in patients with higher risk of surgical infection or lower immunity.
[0050] See also Figure 2 On the basis of the above embodiment, the inner surface of the acetabular cup body 110 is polished to make its surface roughness Ra≤2 μm, so as to further reduce the wear of the acetabular liner 130 relative to the inner surface of the acetabular cup body 110 .
[0051] Furthermore, the inner surface of the acetabular cup body 110 also includes a conical surface 112 and an inner spherical surface 113 , the inner spherical surface 113 is connected to the conical surface 112 , the conical surface 112 is close to the port of the acetabular cup body 110 , and the acetabular cup body 110 is coaxial with the inner spherical surface 113 and the conical surface 112 .
[0052] It can be understood that the inner surface of the acetabular cup body 110 formed by the conical surface 112 and the inner spherical surface 113 is adapted to the outer surface of the acetabular cup liner, and the inner surface of the acetabular cup body 110 formed by the conical surface 112 and the inner spherical surface 113 can prevent the acetabular liner from being offset relative to the axial direction. The setting of the conical surface 112 can accurately install the acetabular cup liner, thereby improving the stability of the joint prosthesis 100 for hip replacement surgery.
[0053] Optionally, the structure of the conical surface 123 conforms to the Morse cone structure, and correspondingly, the cone angle of the conical surface 123 is α, wherein 5°≤α≤30°, and the specific value of α can be 5°, 10°, 15°, 20°, 25°, or 30°.
[0054] In one embodiment, the inner surface of the acetabular cup body 110 further includes a plane 114, the plane 114 is away from the port of the acetabular cup body 110, and the conical surface 112, the inner spherical surface 113 and the plane 114 are sequentially connected. When the top of the inner surface of the acetabular cup body 110 is the plane 114, the stability of the joint prosthesis 100 for hip replacement can be further improved, and the micro-movement of the acetabular cup liner on the inner surface of the acetabular cup body 110 can be prevented.
[0055] In one embodiment, an inserting groove 115 is formed on the inner surface of the acetabular cup body 110 and at the port of the acetabular cup body 110 , and the inserting groove 115 radially fixes the acetabular liner relative to the acetabular cup body 110 .
[0056] In one embodiment, the inner surface of the acetabular cup body 110 is also formed with a snap-in groove, and the snap-in groove fixes the acetabular liner axially relative to the joint prosthesis 100 for hip replacement. Further, the overlapping groove 116 is located above the insertion groove 115, and the overlapping groove 116 is used to overlap with the acetabular cup liner to prevent a large amount of human tissue fluid from flowing into the inner surface of the acetabular cup body 110. It can be understood that the human tissue fluid entering the inner surface of the acetabular cup body 110 is likely to cause micro-motion between the acetabular cup body 110 and the liner.
[0057] In one embodiment, the acetabular cup body 110 has a mounting hole 117; the mounting hole 117 is a countersunk hole. The mounting slot is used to connect with human bone tissue through screws; or the mounting hole 117 is used to remove the acetabular liner.
[0058] As described above, the above embodiments are only used to illustrate the technical solutions of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments can still be modified, or some of the technical features can be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the utility model.
Claims
1. A joint prosthesis for hip replacement, characterized in that: It includes an acetabular cup body and a metal coating; the acetabular cup body is a polyetheretherketone hemisphere or a polyetheretherketone composite hemisphere, the acetabular cup body is hemispherical, and is formed with an inner surface for installing an acetabular cup liner and an outer surface for installing to the acetabular socket of a human body; a circular overlapping groove is formed at the inner surface of the acetabular cup body and the port of the acetabular cup body, and the overlapping groove is used to fix the acetabular cup liner; the metal coating is arranged on the outer surface of the acetabular cup body.
2. The joint prosthesis for hip replacement according to claim 1, characterized in that: The thickness of the metal coating is T1, wherein 20 μm≤T1≤1000 μm.
3. The joint prosthesis for hip replacement according to claim 1, characterized in that: It also includes a hydrophilic coating, which is arranged on the outer surface of the metal coating.
4. The joint prosthesis for hip replacement according to claim 3, characterized in that: The thickness of the metal coating is T1, wherein 50 μm ≤ T1 ≤ 900 μm; The thickness of the hydrophilic coating is T2, wherein 0 μm<T2≤200 μm.
5. The joint prosthesis for hip replacement according to claim 3, characterized in that: The hydrophilic coating is annular and close to the port of the acetabular cup body.
6. The joint prosthesis for hip replacement according to claim 3, characterized in that: It also includes an antibacterial coating, which is arranged on the outer surface of the hydrophilic coating.
7. The joint prosthesis for hip replacement according to any one of claims 1 to 6, characterized in that: The inner surface roughness of the acetabular cup body is Ra≤2μm.
8. The joint prosthesis for hip replacement according to claim 7, characterized in that: The inner surface of the acetabular cup body includes a conical surface and an inner spherical surface, the inner spherical surface is connected to the conical surface, the conical surface is close to the port of the acetabular cup body, and the acetabular cup body is coaxial with the inner spherical surface and the conical surface.
9. The joint prosthesis for hip replacement according to claim 7, characterized in that: The acetabular cup body has a mounting hole; the mounting hole is a countersunk hole.