An artificial joint acetabular cup and a preparation method thereof

Abstract

The present invention discloses an artificial joint acetabular cup and a preparation method thereof, comprising: an acetabular cup main body and an acetabular cup reinforcement body; the acetabular cup main body is a curved thin shell structure, the curved thin shell structure has an inner cavity, and an opening connected to the inner cavity, the acetabular cup reinforcement body is fixedly connected to the opening, the acetabular cup reinforcement body is an annular structure, and the size of the annular structure is adapted to the opening; the acetabular cup main body is a titanium metal main body, and the acetabular cup reinforcement body is a cobalt-based alloy reinforcement body. The present invention proposes an acetabular cup made of a composite metal material and a preparation method thereof to solve the deformation problem of a conventional titanium acetabular cup during implantation into a human body. The acetabular cup prepared by the method described in the present invention not only increases the replaceability of the core components in a full hip replacement prosthesis, but also reduces the thickness of the acetabular cup and enlarges the ball head, thereby improving the mobility of the joint prosthesis and enhancing the anti-dislocation ability.

Description

Technical Field

[0001] The invention relates to orthopedic implants in the medical field, and in particular to an artificial joint acetabulum cup made of a composite metal material and a preparation method thereof. Background Art

[0002] Artificial hip replacement is the most effective way to treat advanced hip disease. Hip replacement prosthesis generally consists of four core components, such as Figure 1 As shown, including:

[0003] Acetabular cup 01: a semicircular metal prosthesis inserted into the pelvis, connected to the host thigh on the outside and a polyethylene or ceramic friction liner on the inside 02;

[0004] Friction lining 02: externally connected to acetabular cup 01, internally connected to joint ball head 03;

[0005] Ball head 03: about 2 / 3 of the sphere, generally made of metal or ceramic material, the outer surface of the ball head 03 and the friction pad 02 form a friction pair of the hip joint, and the hollow cone of the ball head 03 is butted against the neck of the joint handle 04;

[0006] Joint stem 04: A prosthesis placed in the intramedullary cavity of the femur, usually made of metal.

[0007] The success rate of joint replacement surgery depends on several factors:

[0008] First, the fixation and anti-loosening ability between the prosthesis and the host thigh;

[0009] Second, the range of motion and anti-dislocation ability of the friction pair;

[0010] Third, the wear resistance of the friction pad 02.

[0011] The range of motion of the joint is the most important indicator to measure the functionality of the artificial joint. The larger the ball head 03, the higher the joint mobility and the stronger the anti-dislocation ability.

[0012] The main factors that restrict the size of the ball head 03 are as follows:

[0013] First, the anatomical structure of the patient's body, especially women and Asians, generally have smaller bones than Europeans and Americans;

[0014] Second, the thickness of the acetabular cup 01 (the difference between the outer and inner diameters). The acetabular cup 01 is generally made of titanium or titanium alloy and must have a certain thickness to resist deformation during implantation into the pelvis. The thickness of the popular titanium alloy acetabular cup 01 on the market is not less than 5 mm.

[0015] Third, the thickness of the friction pad 02 (the difference between the outer and inner diameters) cannot be less than 5 mm under the constraints of wear resistance. Therefore, reducing the thickness of the acetabular cup 01 is one of the effective ways to increase the size of the ball head 03 while ensuring the anti-deformation capability.

[0016] The deformation of the acetabular cup 01 during the operation mainly occurs at the diameter of the opening of the acetabular cup 01. The host bone in contact with this part has the highest density, stiffness and strength. The deformation of this part will seriously affect the fixation between the friction liner 02 and the acetabular cup 01 and the deformation of the friction liner 02 itself. Therefore, under the premise of ensuring the anti-deformation ability of the opening of the acetabular cup 01, how to reduce the thickness of the opening of the acetabular cup 01 is the most effective way to increase the size of the ball head 03.

[0017] As early as the 1980s, cobalt-chromium-molybdenum alloy (CoCrMo), which has an elastic modulus more than twice that of titanium alloy, was widely used in the manufacture of acetabular cups. However, the biocompatibility between cobalt-chromium-molybdenum alloy and host bone is much lower than that of titanium alloy, and it has been gradually replaced by titanium alloy since the 1990s. Especially in this century, bionic trabecular bone technology based on porous titanium metal has been widely used, and the advantages of titanium-based alloys have been further recognized by orthopedic surgeons. Therefore, it is impossible to abandon titanium metal and return to cobalt-chromium-molybdenum alloy in order to improve the anti-deformation ability of the acetabular cup.

[0018] Therefore, how to improve the deformation resistance of the acetabular cup and effectively reduce the thickness of the acetabular cup are technical problems that urgently need to be broken through in the medical field at this stage.

[0019] Therefore, it is urgent to propose a new technical solution to solve the above problems. Summary of the invention

[0020] The purpose of the present invention is to solve the problems existing in the prior art and provide an artificial joint acetabular cup and a preparation method thereof. The technical solution adopted is:

[0021] A method for preparing an artificial joint acetabular cup comprises the following steps:

[0022] Preparing a preformed acetabular cup: the preformed acetabular cup comprises an acetabular cup reinforcement body and an acetabular cup main body, the acetabular cup main body is made by 3D printing, the acetabular cup reinforcement body is made by machining or 3D printing, the acetabular cup main body is formed on the surface of the acetabular cup reinforcement body, or the acetabular cup reinforcement body is formed on the surface of the acetabular cup main body;

[0023] Further, the preformed acetabular cup is cleaned and reprocessed to obtain a formed acetabular cup;

[0024] Further, heat treatment is performed on the molded acetabular cup;

[0025] Furthermore, the surface of the molded acetabular cup is cleaned and sterilized to obtain an artificial joint acetabular cup.

[0026] The above technical solution further prepares a preformed acetabular cup, specifically comprising:

[0027] An acetabular cup body is manufactured by 3D printing, and a surface of the acetabular cup body is cleaned;

[0028] The acetabular cup body is placed in a 3D printer, and an acetabular cup reinforcement body is formed on the surface of the acetabular cup body by printing to obtain a preformed acetabular cup.

[0029] Furthermore, the acetabular cup body is formed by laser or electron beam 3D printing;

[0030] The acetabular cup reinforcement body is formed by laser or electron beam wire melting 3D printing, or the acetabular cup reinforcement body is formed by laser or electron beam powder melting 3D printing.

[0031] Further, preparing a preformed acetabular cup specifically includes:

[0032] The acetabular cup reinforcement is manufactured by machining;

[0033] The acetabular cup reinforcement body is placed on a printing support plate, and an acetabular cup main body is formed on the surface of the acetabular cup reinforcement body by 3D printing to obtain a preformed acetabular cup.

[0034] Furthermore, an acetabular cup main body is formed on the surface of the acetabular cup reinforcement body, specifically comprising:

[0035] Using a laser or electron beam 3D printer to print the acetabular cup body on the surface of the acetabular cup reinforcement body to obtain a preformed acetabular cup;

[0036] The preformed acetabular cup is reprocessed to obtain a formed acetabular cup, specifically comprising:

[0037] Reprocessing the preformed acetabular cup by machining to obtain a formed acetabular cup that is consistent with the shape and parameters of the target designed acetabular cup;

[0038] Cleaning the preformed acetabular cup and the formed acetabular cup is to remove free powder and inclusions on the surface of the preformed acetabular cup and the formed acetabular cup.

[0039] Furthermore, the acetabular reinforcement body is made of cobalt-based alloy or stainless acid-resistant steel;

[0040] The material of the acetabular cup body is titanium metal.

[0041] The present invention also provides an artificial joint acetabular cup, comprising: an acetabular cup main body and an acetabular cup reinforcement body;

[0042] The acetabular cup body is a curved thin shell structure, the curved thin shell structure has an inner cavity and an opening communicating with the inner cavity, the acetabular cup reinforcement body is fixedly connected to the opening, or the acetabular cup reinforcement body extends from the opening to the cavity wall of the inner cavity;

[0043] The acetabular cup reinforcement body is an annular structure, and the size of the annular structure is adapted to the opening;

[0044] The acetabular cup body is a titanium metal body, and the acetabular cup reinforcement body is a cobalt-based alloy reinforcement body.

[0045] In the above technical solution, the acetabular cup reinforcement body has an upper ring end surface, a lower ring end surface, a side ring surface and a middle through hole.

[0046] Furthermore, the upper ring end face and the lower ring end face are arranged opposite to each other, the side ring face and the hole wall of the middle through hole are arranged opposite to each other, and the middle through hole passes through the upper ring end face and the lower ring end face, and is connected with the opening and the inner cavity in sequence;

[0047] Furthermore, the end surface of the lower ring is correspondingly connected to the opening of the acetabulum body.

[0048] Furthermore, the acetabular cup reinforcement body also has a hemispherical surface, the hemispherical surface has an end surface and an outer spherical surface, the end surface is connected to the side of the lower ring end surface close to the middle through hole, and the outer spherical surface is fixedly connected to the inner cavity wall of the acetabular cup body;

[0049] The outer diameter of the lower ring end surface of the acetabular cup reinforcement body is greater than the outer diameter of the upper ring end surface, and the inner diameter of the lower ring end surface is smaller than the inner diameter of the upper ring end surface.

[0050] Furthermore, the acetabular cup body is a curved thin shell structure, the outer surface of the curved thin shell structure is a rough non-porous surface or a rough porous surface, and the minimum thickness of the acetabular cup body is 1 mm;

[0051] The distance between the upper ring end face and the lower ring end face of the acetabular cup reinforcement body is in the range of 2 to 10 mm;

[0052] The distance between the side annular surface of the acetabular cup reinforcement body and the hole wall of the middle through hole is in the range of 2 to 10 mm.

[0053] Compared with the prior art, the present invention has one or more of the following beneficial effects:

[0054] 1. The present invention provides a method for preparing an artificial joint acetabular cup. The prepared acetabular cup is composed of two metal materials with different elastic moduli. The material of the acetabular cup main body is titanium or titanium alloy. The acetabular cup reinforcement body at the opening diameter portion of the acetabular cup is cobalt-chromium-molybdenum alloy or stainless steel with a higher elastic modulus. The acetabular cup reinforcement body is an annular or gradient annular structure. The anti-deformation ability of the annular structure under the radial product pressure is proportional to the 1 / 2 power of the elastic modulus of the material of the annular structure and is proportional to the difference (thickness) between the outer and inner radii of the annular structure, thereby forming a composite acetabular cup with stronger anti-deformation ability.

[0055] 2. The molded acetabular cup made by the present invention has two different materials. For the annular structures of the two different materials, the same deformation is maintained under the same extrusion pressure. The relative thickness of the annular structure (h1 / h2) is inversely proportional to the 1 / 2 power of the relative elastic modulus of the two materials (E2 / E1). The elastic modulus of titanium alloy such as Ti6Al4V is 100GPa (E1), and the elastic modulus of cobalt-chromium-molybdenum alloy is 220GPa (E2). Under the same extrusion pressure, the same deformation is achieved. The thickness of the annular structure made of cobalt-chromium-molybdenum will be at least 40% lower than that of the titanium alloy annular structure. Therefore, the thickness of the composite metal material acetabular cup of the present invention can be at least 40% lower than that of the traditional titanium metal acetabular cup. Under the condition that the outer diameter of the acetabular cup is the same, the inner diameter of the cobalt-chromium-molybdenum acetabular cup can be at least 40% larger than that of the traditional titanium metal acetabular cup.

[0056] 3. The present invention proposes an acetabular cup made of a composite metal material and a preparation method thereof to solve the deformation problem of a conventional titanium acetabular cup during implantation into a human body. The acetabular cup prepared by the method described in the present invention not only increases the replaceability of core components in a total hip replacement prosthesis, but also reduces the thickness of the acetabular cup, increases the ball head, thereby improving the range of motion of the joint prosthesis and enhancing its anti-dislocation ability. BRIEF DESCRIPTION OF THE DRAWINGS

[0057] In order to more clearly illustrate the embodiments of the present invention 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 present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0058] Figure 1 It is a schematic diagram of the structure of the core prosthetic components of total hip replacement;

[0059] Figure 2 is a schematic diagram of the cross-sectional structure of a composite metal acetabular cup under an embodiment;

[0060] Figure 3is a schematic diagram of the cross-sectional structure of a composite metal acetabular cup in another embodiment;

[0061] Figure 4 is a schematic diagram of the cross-sectional structure of a composite metal acetabular cup in another embodiment;

[0062] Figure 5 is a schematic diagram of the cross-sectional structure of a composite metal acetabular cup in another embodiment;

[0063] Figure 6 It is a schematic diagram of the cross-sectional structure of the smallest model (44mm) traditional titanium alloy acetabular cup and its matching friction liner and the maximum size combination of the ball head;

[0064] Figure 7 It is a schematic diagram of the cross-sectional structure of the smallest model (44mm) composite metal acetabular cup and its matching friction liner and the maximum size combination of the ball head;

[0065] Figure 8 It is a schematic diagram of the cross-sectional structure of the most commonly used model (50mm) of the traditional titanium alloy acetabular cup and its matching friction liner and the maximum size combination of the ball head;

[0066] Fig. 9 It is a schematic diagram of the cross-sectional structure of the most commonly used model (50mm) of composite metal material acetabular cup and its matching friction liner and the maximum size combination of the ball head.

[0067] Among them, 01-acetabular cup; 02-friction lining; 03-joint ball head; 04-joint stem; 05-traditional titanium alloy acetabular cup; 06-friction lining; 07-ball head;

[0068] 10- acetabular cup reinforcement body; 11- upper ring end face; 12- lower ring end face; 13- side ring surface; 14- middle through hole; 15- hemispherical surface; 20- acetabular cup body; 21- opening; 30- molded acetabular cup; 40- ball head; 50- friction liner. DETAILED DESCRIPTION

[0069] The following will be combined with the accompanying drawings of the embodiments of the present invention to clearly and completely describe the technical solutions of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0070] In the description of the present invention, it should be understood that the terms "upper", "lower", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships 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 limiting the present invention. In the description of the present invention, "plurality" means two or more, unless otherwise clearly and specifically defined.

[0071] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0072] The gist of the present invention is further explained below with reference to the accompanying drawings and embodiments.

[0073] Embodiment 1:

[0074] In view of the problems existing in the prior art, the present invention provides a method for preparing an artificial joint acetabular cup to solve the deformation problem of a conventional titanium acetabular cup during implantation in a human body. The method comprises printing a semicircular titanium or titanium alloy acetabular cup body 20 directly onto the cobalt-chromium-molybdenum annular structure on the basis of a machined acetabular cup reinforcement body 10 (cobalt-chromium-molybdenum annular structure) by laser or electron beam 3D printing technology. The cross-sectional structure of the obtained acetabular cup can be Figure 2-5 Any one of the steps specifically includes the following steps:

[0075] Step 1: Manufacturing the acetabular cup reinforcement body 10 (cobalt-chromium-molybdenum or stainless steel annular structure) by machining;

[0076] Step 2: placing the acetabular cup reinforcement body 10 in the main support plate of a laser or electron beam 3D printer;

[0077] Step 3: directly printing a semicircular titanium metal acetabular cup body 20 on the surface of the acetabular cup reinforcement body 10 to obtain a preformed acetabular cup;

[0078] Step 4: Take out the printed preformed acetabular cup (composite structure) and remove free powder or inclusions;

[0079] Step 5: Final shaping of the preformed acetabular cup by machining to obtain a formed acetabular cup 30 that meets the product design standards;

[0080] Step 6: Perform necessary cleaning on the molded acetabular cup 30;

[0081] Step 7: The cleaned product is selectively heat treated to eliminate residual stress and further remove free metal and inclusions;

[0082] Step 8: Packaging and sterilization to obtain the artificial joint acetabular cup.

[0083] Embodiment 2:

[0084] The present invention provides another method for preparing an artificial joint acetabular cup, which comprises first printing a semicircular titanium or titanium alloy acetabular cup body 20 by laser or electron beam 3D printing technology, and then printing an annular acetabular cup reinforcement body 10 (cobalt-chromium-molybdenum or stainless steel structure) at the opening 21 of the titanium metal acetabular cup body 20 by laser or electron beam 3D printing technology. The cross-sectional structure of the obtained acetabular cup can be Figure 2-5 Any one of the steps specifically includes the following steps:

[0085] Step 1: 3D printing a semicircular titanium acetabular cup body 20 by laser or electron beam;

[0086] Step 2: Take out the printed titanium metal acetabular cup body 20 and remove free powder or inclusions;

[0087] Step 3: placing the titanium acetabular cup body 20 in a rapid prototyping 3D printer of laser or electron beam melting wire or melting powder, and printing the acetabular cup reinforcement body 10 (a cobalt-chromium-molybdenum or stainless steel annular structure) directly onto the titanium acetabular cup body 20 to obtain a preformed acetabular cup;

[0088] Step 4: Final shaping of the preformed acetabular cup by machining to obtain a formed acetabular cup 30 that meets the product design standards;

[0089] Step 5: Perform necessary cleaning on the molded acetabular cup 30;

[0090] Step 6: selectively heat treating the cleaned molded acetabular cup 30 to eliminate residual stress and further remove free metal and inclusions;

[0091] Step 7: Packaging and sterilization to obtain the artificial acetabular cup.

[0092] Embodiment 3:

[0093] The present invention provides an artificial joint acetabular cup, see Figure 2-5 , which comprises: an acetabular cup main body 20 and an acetabular cup reinforcement body 10;

[0094] The acetabular cup body 20 is a curved thin shell structure, which has an inner cavity and an opening 21 communicating with the inner cavity, and the acetabular cup reinforcement body 10 is fixedly connected to the opening 21, or the acetabular cup reinforcement body 10 extends from the opening 21 to the cavity wall of the inner cavity;

[0095] The acetabular cup reinforcement body 10 is an annular structure, and the size of the annular structure is adapted to the opening 21;

[0096] The acetabular cup body 20 is a titanium metal body, and the acetabular cup reinforcement body 10 is a cobalt-based alloy reinforcement body.

[0097] In one embodiment, the acetabular cup reinforcement body 10 of the present invention comprises an upper ring end surface 11, a lower ring end surface 12, a side ring surface 13 and a middle through hole 14.

[0098] The upper ring end face 11 and the lower ring end face 12 are arranged opposite to each other, the side ring face 13 and the hole wall of the middle through hole 14 are arranged opposite to each other, and the middle through hole 14 passes through the upper ring end face 11 and the lower ring end face 12, and is connected with the opening 21 and the inner cavity in sequence;

[0099] The lower ring end surface 12 is connected to the opening 21 of the acetabular cup body 20. Figure 2 , 3 ,in Figure 3 The cross section of the acetabular reinforcement body 10 is trapezoidal, the outer diameter of the lower ring end face 12 of the acetabular reinforcement body 10 is larger than the outer diameter of the upper ring end face 11 , and the inner diameter of the lower ring end face 12 is smaller than the inner diameter of the upper ring end face 11 .

[0100] In another embodiment, the acetabular cup reinforcement body 10 further has a hemispherical surface 15, the hemispherical surface 15 has an end surface and an outer spherical surface, the end surface is connected to the side of the lower ring end surface 12 close to the middle through hole 14, and the outer spherical surface is fixedly connected to the inner cavity wall of the acetabular cup body 20. Figure 4 , 5 ,in Figure 4 The outer spherical surface of the hemispherical surface 15 is a complete hemispherical outer spherical surface, and the complete hemispherical outer spherical surface is fixedly connected to the inner cavity wall of the acetabular cup body 20, and the inner cavity wall of the acetabular cup body 20 is completely covered by the complete hemispherical outer spherical surface;

[0101] Figure 5 The outer spherical surface of the hemispherical surface 15 is a partial spherical surface, which is fixedly connected to the inner cavity wall of the acetabular cup body 20, and the inner cavity wall of the acetabular cup body 20 is partially covered.

[0102] In one embodiment, the acetabular cup body 20 of the present invention is a curved thin shell structure, the outer surface of the curved thin shell structure is a rough non-porous surface or a rough porous surface, and the minimum thickness of the acetabular cup body 20 is 1 mm;

[0103] The distance between the upper ring end face 11 and the lower ring end face 12 of the acetabular cup reinforcement body 10 is in the range of 2 to 10 mm;

[0104] The spacing between the side annular surface 13 of the acetabular cup reinforcement body 10 and the hole wall of the middle through hole 14 is in the range of 2 to 10 mm. The present invention provides a method for preparing an artificial joint acetabular cup, wherein the prepared acetabular cup is composed of two metal materials with different elastic moduli, the acetabular cup body is made of titanium or titanium alloy, the acetabular cup reinforcement body at the opening diameter portion of the acetabular cup is a cobalt-chromium-molybdenum alloy or stainless steel with a higher elastic modulus, and the acetabular cup reinforcement body is an annular or gradient annular structure, and the anti-deformation ability of the annular structure under the radial product pressure is proportional to the 1 / 2 power of the elastic modulus of the material of the annular structure, and is proportional to the difference (thickness) between the outer and inner radii of the annular structure, thereby forming a composite acetabular cup with stronger anti-deformation ability.

[0105] The molded acetabular cup made by the present invention has two different materials. The material of the acetabular cup reinforcement body can be cobalt-chromium-molybdenum or a stainless steel annular structure. For the molded acetabular cup composed of two different materials, the same deformation amount is maintained under the same extrusion pressure. The relative thickness of the acetabular cup main body and the acetabular cup reinforcement body (h1 / h2) is inversely proportional to the 1 / 2 power of the relative elastic modulus of the two materials (E2 / E1). The elastic modulus of titanium alloy such as Ti6Al4V is 100GPa (E1), and the elastic modulus of cobalt-chromium-molybdenum alloy is 220GPa (E2). Under the same extrusion pressure, the same deformation amount is maintained. The thickness of the annular structure (acetabular cup reinforcement body) made of cobalt-chromium-molybdenum will be at least 40% lower than the thickness of the titanium alloy annular structure (acetabular cup reinforcement body). Therefore, the thickness of the composite metal material acetabular cup of the present invention can be at least 40% lower than the thickness of the traditional titanium metal acetabular cup. Under the condition that the outer diameter of the acetabular cup is the same, the inner diameter of the cobalt-chromium-molybdenum acetabular cup can be at least 40% larger than the inner diameter of the traditional titanium metal acetabular cup.

[0106] The advantages of the acetabular cup made by the method of the present invention are explained below with reference to examples:

[0107] 1. The smallest ultra-thin acetabular cup:

[0108] The smallest size of the traditional titanium alloy acetabular cup 05 currently on the market is 44mm (outer diameter D), see Figure 6, its minimum thickness is 5mm, so the maximum inner diameter d of this model of acetabular cup 05 is 34mm. Under the requirement that the thickness of friction lining 06 cannot be less than 5mm, the inner diameter of friction lining 06 cannot exceed 24mm, that is, the maximum outer diameter Q of ball head 07 is 24mm. The standard sizes of ball heads 07 on the market are 22, 26, 28, 32 and 36mm, so this model of titanium alloy acetabular cup 05 can only accommodate 22mm ball heads 07, and there is no interchangeability.

[0109] Continue to see Figure 7 The composite metal material acetabular cup 30 of the present invention can reduce the thickness of the acetabular cup 30 by at least 40% while maintaining the smallest model with an outer diameter D of 44 mm, and the minimum thickness of the acetabular cup 30 can reach 1 mm, that is, the inner diameter of the acetabular cup 30 can be increased by at least 40% to 38 mm. The acetabular cup 30 can accommodate a friction pad 50 with an outer diameter d of 38 mm. Under the requirement that the thickness of the friction pad 50 cannot be less than 5 mm, the inner diameter of the friction pad 50 reaches 28 mm, which just accommodates a standard ball head with an outer diameter Q of 28 mm. For the smallest model acetabular cup with an outer diameter of 44 mm, a ball head 40 of 28 mm can be accommodated. In this way, another combination method for the smallest model acetabular cup with an outer diameter of 44 mm is provided, and the thickness of the acetabular cup is reduced.

[0110] 2. The most common type of ultra-thin acetabular cup:

[0111] The most common model of the traditional titanium alloy acetabular cup 05 currently on the market is 50mm (outer diameter D), see Figure 8 , its minimum thickness is 5mm, so the maximum inner diameter d of this model of acetabular cup 05 is 40mm. Under the requirement that the thickness of friction lining 06 cannot be less than 5mm, the inner diameter of friction lining 06 cannot exceed 30mm, that is, the maximum outer diameter Q of ball head 07 is 30mm. The standard sizes of ball heads 07 on the market are 22, 26, 28, 32 and 36mm, so this model of titanium alloy acetabular cup 05 can only accommodate 28mm ball heads 07, and there is no interchangeability.

[0112] Continue to see Fig. 9The composite metal material acetabular cup 30 of the present invention can reduce the thickness of the acetabular cup 30 by at least 40% while maintaining the smallest model with an outer diameter D of 50 mm, and the minimum thickness of the acetabular cup 30 can reach 1 mm, that is, the inner diameter of the acetabular cup 30 can be increased by at least 40% to 44 mm. The acetabular cup 30 can accommodate a friction pad 50 with an outer diameter d of 44 mm. Under the requirement that the thickness of the friction pad 50 cannot be less than 5 mm, the inner diameter of the friction pad 50 reaches 34 mm, which just accommodates a standard ball head 40 with an outer diameter Q of 32 mm. For the smallest model acetabular cup with an outer diameter of 50 mm, a ball head 40 of 32 mm can be accommodated. In this way, another combination method for the most common model acetabular cup with an outer diameter of 50 mm is provided, and the thickness of the acetabular cup is reduced.

[0113] In summary, the present invention proposes an acetabular cup made of a composite metal material and a preparation method thereof, so as to solve the deformation problem of a conventional titanium acetabular cup during implantation into a human body. The acetabular cup prepared by the method described in the present invention not only increases the replaceability of core components in a total hip replacement prosthesis, but also reduces the thickness of the acetabular cup, increases the ball head, thereby improving the range of motion of the joint prosthesis and enhancing its anti-dislocation ability.

[0114] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example" or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine different embodiments or examples described in this specification.

[0115] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify and vary the above embodiments within the scope of the present invention.

Claims

1. An artificial joint acetabular cup, characterized in that: include: An acetabular cup body (20) and an acetabular cup reinforcement body (10); The acetabular cup body (20) is a curved thin shell structure, the curved thin shell structure has an inner cavity and an opening (21) communicating with the inner cavity, the acetabular cup reinforcement body (10) is fixedly connected to the opening (21), or the acetabular cup reinforcement body (10) extends from the opening (21) to the cavity wall of the inner cavity; The acetabular cup reinforcement body (10) is an annular structure, and the size of the annular structure is adapted to the opening (21); The acetabular cup body (20) is a titanium metal body, and the acetabular cup reinforcement body (10) is a cobalt-based alloy reinforcement body. The acetabular cup reinforcement body (10) comprises an upper ring end surface (11), a lower ring end surface (12), a side ring surface (13) and a middle through hole (14). The upper ring end surface (11) and the lower ring end surface (12) are arranged opposite to each other, the side ring surface (13) and the hole wall of the middle through hole (14) are arranged opposite to each other, and the middle through hole (14) passes through the upper ring end surface (11) and the lower ring end surface (12), and is connected with the opening (21) and the inner cavity in sequence; The lower ring end surface (12) is correspondingly connected to the opening (21) of the acetabular cup body (20). The acetabular cup body (20) is a curved thin shell structure, the outer surface of the curved thin shell structure is a rough non-porous surface or a rough porous surface, and the minimum thickness of the acetabular cup body (20) is 1 mm; The distance between the upper ring end surface (11) and the lower ring end surface (12) of the acetabular cup reinforcement body (10) is in the range of 2 to 10 mm; The distance between the side annular surface (13) of the acetabular cup reinforcement body (10) and the hole wall of the middle through hole (14) is in the range of 2 to 10 mm.

2. The acetabular cup according to claim 1, characterized in that: The acetabular cup reinforcement body (10) further comprises a hemispherical surface (15), wherein the hemispherical surface (15) comprises an end surface and an outer spherical surface, wherein the end surface is connected to a side of the lower ring end surface (12) close to the middle through hole (14), and the outer spherical surface is fixedly connected to the inner cavity wall of the acetabular cup body (20); The outer diameter of the lower ring end surface (12) of the acetabular cup reinforcement body (10) is greater than the outer diameter of the upper ring end surface (11), and the inner diameter of the lower ring end surface (12) is smaller than the inner diameter of the upper ring end surface (11).

3. A method for preparing an artificial joint acetabular cup according to claim 1 or 2, characterized in that: The steps include: Preparing a preformed acetabular cup: the preformed acetabular cup comprises an acetabular cup reinforcement body (10) and an acetabular cup main body (20), the acetabular cup main body (20) is manufactured by 3D printing, the acetabular cup reinforcement body (10) is manufactured by machining or 3D printing, the acetabular cup main body (20) is formed on the surface of the acetabular cup reinforcement body (10), or the acetabular cup reinforcement body (10) is formed on the surface of the acetabular cup main body (20); Cleaning and reprocessing the preformed acetabular cup to obtain a formed acetabular cup (30); Performing heat treatment on the molded acetabular cup (30); The molded acetabular cup (30) is subjected to surface cleaning and sterilization treatment to obtain an artificial joint acetabular cup.

4. The preparation method according to claim 3, characterized in that: Preparing a preformed acetabular cup includes: An acetabular cup body (20) is manufactured by 3D printing, and the surface of the acetabular cup body (20) is cleaned; The acetabular cup body (20) is placed in a 3D printer, and an acetabular cup reinforcement body (10) is formed on the surface of the acetabular cup body (20) by printing, thereby obtaining a preformed acetabular cup.

5. The preparation method according to claim 4, characterized in that: The mortar cup body (20) is formed by laser or electron beam 3D printing; The acetabular cup reinforcement body (10) is formed by laser or electron beam wire melting 3D printing, or the acetabular cup reinforcement body (10) is formed by laser or electron beam powder melting 3D printing.

6. The preparation method according to claim 3, characterized in that: Preparing a preformed acetabular cup includes: Manufacturing an acetabular cup reinforcement body (10) by machining; The acetabular cup reinforcement body (10) is placed on a printing support plate, and an acetabular cup main body (20) is formed on the surface of the acetabular cup reinforcement body (10) by 3D printing, thereby obtaining a preformed acetabular cup.

7. The preparation method according to claim 6, characterized in that: An acetabular cup main body (20) is formed on the surface of the acetabular cup reinforcement body (10), and specifically comprises: Using a laser or electron beam 3D printer to print and form an acetabular cup main body (20) on the surface of the acetabular cup reinforcement body (10), thereby obtaining a preformed acetabular cup; The preformed acetabular cup is reprocessed to obtain a formed acetabular cup (30), specifically comprising: Reprocessing the preformed acetabular cup by machining to obtain a formed acetabular cup (30) having the same shape and parameters as the target designed acetabular cup; Cleaning the preformed acetabular cup and the formed acetabular cup (30) is to remove free powder and inclusions on the surface of the preformed acetabular cup and the surface of the formed acetabular cup (30).

8. The preparation method according to claim 3, characterized in that: The acetabular cup reinforcement body (10) is made of cobalt-based alloy or stainless acid-resistant steel; The acetabular cup body (20) is made of titanium metal.

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