Acetabular cup of 3D printing porous structure

Abstract

The utility model relates to an acetabular cup with a 3D printing porous structure, which comprises a cup body and a double-layer porous structure, the double-layer porous structure is partially embedded into the cup body, the cup body is provided with a plurality of positioning through holes, and the plurality of positioning through holes penetrate through the cup body and the double-layer porous structure; the double-layer porous structure comprises an outer-layer porous structure and an inner-layer porous structure, the outer-layer porous structure is formed by a plurality of cube unit arrays, a plurality of cubes are provided with a plurality of through holes, the inner-layer porous structure is formed by splicing a plurality of rib rods, and the rib rods are spliced to form quadrilateral through holes and hexagonal through holes; a plurality of quadrilateral through holes and hexagonal through hole arrays are spliced to form an inner-layer porous structure. Compared with the prior art, the outer-layer porous structure of the acetabular cup provided by the utility model increases the initial stability of the cup body, and the rib rod structure in the inner-layer porous structure is beneficial to powder removal of the cup body; the acetabular cup is integrally formed based on 3D printing, and after part machining is completed, only powder cleaning needs to be conducted.

Description

TECHNICAL FIELD

[0001] The utility model relates to medical orthopedics bionic material technical field especially is related to a 3D printing porous structure's acetabular cup. BACKGROUND

[0002] Hip joint replacement is also called artificial hip joint replacement, which is to replace the diseased joint by fixing the artificial prosthesis, including femoral part and acetabular part, on the normal bone using bone cement and screw. The material of artificial prosthesis includes stainless steel, titanium alloy, ceramic and other materials. Some patients have postoperative pain and obvious prosthesis loosening. The acetabular cup is composed of titanium or cobalt-chromium alloy shell and ultra-high molecular weight polyethylene liner, which requires high precision. The shape of these components is extremely complex, and custom fixtures are required in traditional machining process. The wall thickness of the components is very thin, and the vibration during machining must be strictly controlled. In order to efficiently and excellently process these complex components, custom tools are often required.

[0003] Challenges faced by CNC machining: prolong tool life; reduce vibration during machining; optimize acetabular cup turning; control chip flow and maximize turning productivity. In addition, the machining process is extremely wasteful of materials, and medical metal materials are relatively expensive, which increases the burden on patients.

[0004] In addition, 3D printing acetabular cup is different from traditional process, 3D printing acetabular cup can realize customization, according to the actual use of the demand to carry on the pertinence design. There are some problems in the 3D printing acetabular cup on the market that need to be solved, the porous structure layer needs reliable friction force to prevent loosening when combined with bone, the porosity of the porous structure layer should not be too large to cause fibrosis when the bone grows in, and the small porosity will cause the problem of difficult powder cleaning. UTILITY MODEL CONTENTS

[0005] The utility model discloses a kind of 3D printing porous structure's acetabular cup, the outer layer porous structure of the acetabular cup provided by the utility model increases cup body initial stability, and the rib structure in inner layer porous structure is conducive to cup body powder cleaning;The acetabular cup based on 3D printing is integrally formed, after completing part processing, only need to clean powder.

[0006] The purpose of the utility model can be realized by the following technical solutions:

[0007] A kind of 3D printing porous structure's acetabular cup, including cup body and double-layer porous structure, the double-layer porous structure is partially embedded cup body, the cup body is equipped with multiple positioning through holes, multiple positioning through holes pass through cup body and double-layer porous structure;

[0008] The double-layer porous structure comprises an outer-layer porous structure and an inner-layer porous structure, the outer-layer porous structure is formed by an array of multiple cubic units, a plurality of through holes are arranged on the multiple cubic units, the inner-layer porous structure is formed by splicing of multiple rib rods, a plurality of quadrilateral through holes and hexagonal through holes are formed by the multiple rib rods, and the multiple quadrilateral through holes and hexagonal through holes are spliced to form the inner-layer porous structure.

[0009] As a preferred technical scheme, the outer-layer porous structure increases the initial stability of the cup body, and the rib rod structure in the inner-layer porous structure is beneficial to powder cleaning of the cup body.

[0010] In an embodiment of the utility model, the rib rod comprises two end portions, the rib rod extends along a first direction in which one end portion points to the other end portion, and any two interconnected rib rods are connected through the respective end portions; each end portion is connected to the end portions of three other rib rods to form a node.

[0011] In an embodiment of the utility model, the outer-layer porous structure and the inner-layer porous structure are spliced in an offset manner.

[0012] In the utility model, the outer-layer porous structure is designed in an array manner by the multiple-through-hole cubic structure; the inner-layer porous structure is designed in an array manner by the quadrilateral-hexagonal splicing structure, and the quadrilateral-hexagonal splicing structure is more compact after being arrayed and has a small-range change in porosity, has a more reliable stress structure, and is more suitable for bone ingrowth.

[0013] In an embodiment of the utility model, the cup body is a hollow hemispherical structure, the outer diameter of the hollow hemispherical structure is 40-72 mm, and the inner diameter is 37-69 mm; the inside of the cup body is a conical spherical structure.

[0014] In an embodiment of the utility model, a first positioning through hole is arranged on the central axis of the top of the cup body, and a second positioning through hole, a third positioning through hole, and a fourth positioning through hole are arranged on the side wall of the cup body.

[0015] In an embodiment of the utility model, the included angle between the axis of the second positioning through hole and the axis of the first positioning through hole is 45°-60°.

[0016] The included angle between the axis of the third positioning through hole and the axis of the first positioning through hole is 45°-60°.

[0017] The included angle between the axis of the fourth positioning through hole and the axis of the first positioning through hole is 45°-60°, and the included angle between the axis of the fourth positioning through hole and the axis of the third positioning through hole is 45°-90°.

[0018] In an embodiment of the utility model, the thickness of the double-layer porous structure is 0.5-1.5mm.

[0019] In an embodiment of the utility model, the thickness of the outer-layer porous structure is 0.4-0.8mm, and the porosity of the outer-layer porous structure is 60%-70%;

[0020] The thickness of the inner-layer porous structure is 0.4-0.8mm, and the porosity of the inner-layer porous structure is 70%-80%.

[0021] As preferred technical schemes, the thickness of the outer-layer porous structure is 0.6mm,

[0022] The thickness of the inner-layer porous structure is 0.6mm.

[0023] In an embodiment of the utility model, the size of the cubic unit is 0.4-0.8mm, the through-hole on the cubic is an arc-shaped through-hole close to a triangle, and the aperture of the through-hole is 0.2-0.5mm.

[0024] As preferred technical schemes, the size of the cubic unit is 0.6mm, and the aperture of the through-hole is 0.4mm.

[0025] In an embodiment of the utility model, the length of the rib rod is 0.3-0.7mm, and the diameter of the rib rod is 0.05-0.15mm.

[0026] As preferred technical schemes, the length of the rib rod is 0.5mm, and the diameter of the rib rod is 0.1mm.

[0027] Compared with the prior art, the utility model has the following beneficial effects:

[0028] 1、The acetabular cup provided by the utility model adopts double porous structure layer design, meets the actual demand of different contact surfaces, and the outer-layer and inner-layer porous structures are designed into different structure layers according to different application demands.

[0029] 2. The outer porous structure of the acetabular cup provided by the utility model is mainly curved surface, the contact area of which is larger when combined with the bone, the friction force during combination is increased, the acetabular cup is combined tightly during implantation, the service life is prolonged, meanwhile, the through holes on the curved surface also meet the requirement of the pores when the bone grows in, the mechanical property of the connection between the acetabular cup prosthesis and the bone tissue after implantation is improved, good biological fixation is realized; the inner porous structure is mainly the rib rod, the requirement of the pores is realized by the rib rod connection, the structure is more permeable, the porosity is larger, the bone grows in conveniently, and the recovery speed of the patient after operation is accelerated.

[0030] 3. The inner porous structure of the acetabular cup provided by the utility model is a quadrilateral hexagonal rib rod splicing structure, when the array is designed, the quadrilateral fills the gap generated when the hexagonal splicing is spliced, the ingenious design makes the overall structure more compact, and the overall structure is more reliable when stressed; in addition, the inner and outer layers of the double-layer porous structure are spliced in the offset mode, the two layer structures are integrated during the 3D printing process, the consistency of the acetabular cup design is maintained, the problem that the inner and outer layers are layered is avoided, and the whole acetabular cup is still integrated.

[0031] 4. In the acetabular cup provided by the utility model, because the quadrilateral hexagonal rib rod splicing structure has a special innovative structure, the contact area of the part and the powder bed is reduced during the 3D printing process, when the powder cleaning process is carried out, the innovative rib design reduces the residual powder adhered to the surface of the part, because the contact area is smaller, the powder cleaning process is simple and effective, the safety and reliability of the part product during human implantation are ensured, the implementation of the powder cleaning process is facilitated, the residual powder remaining in the part is reduced, and the safety and health of the patient during human implantation are ensured.

[0032] 5. In the utility model, the cup body and the porous structure are integrally formed by the 3D printing process, the integrally formed preparation scheme of the cup body and the double porous structure layer realizes the good mechanical property of the double porous structure layer and the cup body, prevents the coating from falling off, prolongs the service life, and has higher strength, durability and service life than the traditional porous preparation process; the integrally formed preparation scheme of the cup body and the double porous structure layer realizes the advantages of avoiding the disadvantages of the traditional machining mode, saves resources and reduces cost. BRIEF DESCRIPTION OF DRAWINGS

[0033] Figure 1 It is the overall structure schematic view of the acetabular cup in the utility model;

[0034] Figure 2 It is the front view of the acetabular cup in the utility model;

[0035] Figure 3 It is Figure 2 A-A sectional view in the utility model;

[0036] Figure 4 Structure diagram of a structure being a component unit of an inner layer porous structure;

[0037] Figure 5 Structure diagram of a structure being a component unit of an outer layer porous structure;

[0038] Figure 6 The top view of the acetabular cup in the utility model;

[0039] Figure 7 The top view of the acetabular cup in the utility model; Figure 5 The B-B section view in the utility model;

[0040] Figure 8 The top view of the acetabular cup in the utility model; Figure 6 The C-C section view in the utility model;

[0041] Figure 9 Structure diagram of a double-layer porous structure;

[0042] Figure 10 Structure diagram of a splicing structure of an outer layer porous structure;

[0043] Figure 11 Structure diagram of a splicing structure of an inner layer porous structure.

[0044] The figure number explanation: 1, cup body, 2, double-layer porous structure, 3, first positioning through hole, 4, second positioning through hole, 5, third positioning through hole, 6, fourth positioning through hole, 7, outer layer porous structure, 8, inner layer porous structure. DETAILED DESCRIPTION

[0045] The utility model will be described in detail below in combination with the drawings and specific embodiments. The embodiment is implemented on the premise of the technical scheme of the utility model, and detailed implementation mode and specific operation process are given, but the protection scope of the utility model is not limited to the following examples.

[0046] It should be noted that: similar signs and letters represent similar items in the following drawings, therefore, once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings.

[0047] In the description of the utility model, it should be explained that, the orientation or position relationship indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like is based on the orientation or position relationship shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, and cannot be understood as indicating or implying that the indicated device or element must have a specific orientation, be constructed and operated in a specific orientation, therefore, it cannot be understood as a limitation on the utility model. In addition, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0048] In the description of the utility model, it is to explain, unless there is definite and limited, the term "installation", "link", "connection" should be broad sense understanding, for example, can be fixed connection, also can be detachable connection, or integrally connected;Can be mechanical connection, also can be electrical connection;Can be directly connected, also can be indirectly connected through the intermediate medium, can be two elements inside the communication。For ordinary skilled in the art, the above-mentioned terms can be understood according to the specific meaning of the utility model.

[0049] Some embodiments of the utility model are described in detail below in conjunction with the drawings.In the case of no conflict, the following examples and features in examples can be combined with each other.

[0050] Example 1

[0051] Referring to Figures 1 to 11 , the embodiment provides a 3D printing porous structure acetabular cup, including cup body 1 and double-layer porous structure 2, the double-layer porous structure 2 is partially embedded in cup body 1, a plurality of positioning through holes are arranged on the cup body 1, and the plurality of positioning through holes pass through cup body 1 and double-layer porous structure 2;

[0052] The double-layer porous structure 2 includes outer layer porous structure 7 and inner layer porous structure 8, the outer layer porous structure 7 is formed by a plurality of cubic unit arrays, a plurality of through holes are arranged on the cubic, the inner layer porous structure 8 is formed by a plurality of rib splices, a plurality of quadrilateral through holes and hexagonal through holes are formed by a plurality of rib splices, and a plurality of quadrilateral through holes and hexagonal through holes are arrayed and spliced to form the inner layer porous structure 8.

[0053] In the embodiment, the rib includes two end portions, the rib extends along a first direction in which one end portion points to the other end portion, and each of any two interconnected ribs is connected by the respective end portion; each end portion is connected with the end portions of three other ribs to form a node.

[0054] In the embodiment, the outer layer porous structure 7 and the inner layer porous structure 8 are spliced in an offset manner.

[0055] In the embodiment, the cup body 1 is a hollow hemispherical structure, the outer diameter of the hollow hemispherical structure is 40-72mm, the inner diameter is 37-69mm, and the inside of the cup body 1 is a conical matching spherical structure.

[0056] In the embodiment, a first positioning through hole 3 is arranged on the central axis of the top of the cup body 1, a second positioning through hole 4, a third positioning through hole 5 and a fourth positioning through hole 6 are arranged on the side wall of the cup body 1.

[0057] In the embodiment, the angle between the axis of the second positioning through hole 4 and the axis of the first positioning through hole 3 is 45°-60°.

[0058] The angle between the axis of the third positioning through hole 5 and the axis of the first positioning through hole 3 is 45°-60°

[0059] The angle between the axis of the fourth positioning through hole 6 and the axis of the first positioning through hole 3 is 45°-60°, and the angle between the axis of the fourth positioning through hole 6 and the axis of the third positioning through hole 5 is 45°-90°.

[0060] In the embodiment, the thickness of the double-layer porous structure 2 is 0.5-1.5mm.

[0061] In the embodiment, the thickness of the outer porous structure 7 is 0.6mm, and the porosity of the outer porous structure 7 is 60%-70%;

[0062] The thickness of the inner porous structure 8 is 0.6mm, and the porosity of the inner porous structure 8 is 70%-80%.

[0063] In the embodiment, the size of the cubic unit is 0.6mm, and the aperture of the through hole is 0.4mm.

[0064] In the embodiment, the length of the strut is 0.5mm, and the diameter of the strut is 0.1mm.

[0065] The embodiment also provides a use method of the 3D-printed porous structure acetabular cup, and the use method is specifically as follows:

[0066] First, the doctor grinds the acetabulum and punches the cup body, and then punches the screw into the human bone through the second positioning through hole 4, the third positioning through hole 5 and the fourth positioning through hole 6.

[0067] In addition, the embodiment also provides a processing method of the 3D-printed porous structure acetabular cup, and the processing method is specifically as follows:

[0068] S1, when the double-layer porous structure 2 is designed, first, a basic model is built by using modeling software, and then the outer porous structure 7 and the inner porous structure 8 are designed separately;

[0069] S2, the outer porous structure 7 uses a multi-through-hole cubic structure, and a through-hole structure is built in an array manner with a unit structure of 1x1x1mm, and the outer porous structure 7 is obtained by using Boolean operation, and the surface offset is ±0.1mm;

[0070] S3, the inner layer porous structure 8 uses a quadrilateral hexagonal splicing structure, and is built into a through-hole structure in an array mode with a unit structure of 1x1x1 mm, and the inner layer porous structure 8 is obtained by using a Boolean operation, and the surface offset is ±0.2 mm;

[0071] S4, the outer layer porous structure 7 and the inner layer porous structure 8 are integrally designed into a whole double-layer porous structure 2 through surface offset of positive and negative values;

[0072] S5, the double-layer porous structure 2 and the cup body 1 are subjected to a Boolean operation, and the double-layer porous structure 2 and the cup body 1 are made into a whole model through surface offset of ±0.1 mm;

[0073] S6, an STL file is exported, the whole model is sliced, the slicing thickness is 0.2 mm, the device is imported, and a 3D printed acetabular cup is obtained, the electron gun power of an electron beam selective melting device is 3000 w, the minimum spot beam diameter is less than or equal to 0.3 mm, the forming thickness is 0.2 mm, and the forming material is Ti6Al4V.

[0074] The above description of the embodiments is for facilitating the ordinary skilled person in the art to understand and use the utility model. The person skilled in the art can obviously easily make various modifications to the embodiments, and apply the general principles described herein to other embodiments without creative labor. Therefore, the utility model is not limited to the above embodiments, and the improvements and modifications made by the person skilled in the art according to the disclosure of the utility model without departing from the scope of the utility model should be within the protection scope of the utility model.

Claims

1. A 3D-printed porous structure acetabular cup, characterized in that, The cup (1) and the double-layer porous structure (2) are partially embedded in the cup (1), and a plurality of positioning through holes are provided on the cup (1) and pass through the cup (1) and the double-layer porous structure (2); The double-layer porous structure (2) comprises an outer-layer porous structure (7) and an inner-layer porous structure (8), the outer-layer porous structure (7) is formed by an array of a plurality of cubic units, a plurality of through holes are provided on the cubic units, and the inner-layer porous structure (8) is formed by a plurality of rod splices, a plurality of quadrilateral through holes and hexagonal through holes are formed by the rod splices, and the inner-layer porous structure (8) is formed by array splicing of the plurality of quadrilateral through holes and hexagonal through holes.

2. The 3D-printed porous structure acetabular cup of claim 1, wherein, The rod splices comprise two ends, the rod splices extend in a first direction from one end to the other end, and any two interconnected rod splices are connected by the respective ends; each end is connected to the ends of three other rod splices to form a node.

3. The 3D-printed porous structure acetabular cup of claim 1, wherein, The outer-layer porous structure (7) and the inner-layer porous structure (8) are spliced in an offset manner.

4. The 3D-printed porous structure acetabular cup of claim 1, wherein, The cup (1) is a hollow semispherical structure, the outer diameter of the hollow semispherical structure is 40-72 mm, the inner diameter is 37-69 mm, and the inside of the cup (1) is a conical spherical structure.

5. The 3D-printed porous structure acetabular cup of claim 1, wherein, A first positioning through hole (3) is provided on the central axis of the top of the cup (1), a second positioning through hole (4), a third positioning through hole (5), and a fourth positioning through hole (6) are provided on the side wall of the cup (1).

6. The 3D-printed porous structure acetabular cup of claim 5, wherein, The angle between the axis of the second positioning through hole (4) and the axis of the first positioning through hole (3) is 45°-60°; The angle between the axis of the third positioning through hole (5) and the axis of the first positioning through hole (3) is 45°-60° The angle between the axis of the fourth positioning through hole (6) and the axis of the first positioning through hole (3) is 45°-60°, and the angle between the axis of the fourth positioning through hole (6) and the axis of the third positioning through hole (5) is 45°-90°.

7. The 3D-printed porous structure acetabular cup of claim 1, wherein, The thickness of the double-layer porous structure (2) is 0.5-1.5 mm.

8. The 3D-printed porous structure acetabular cup of claim 1, wherein, The thickness of the outer-layer porous structure (7) is 0.4-0.8 mm, and the porosity of the outer-layer porous structure (7) is 60%-70%; The thickness of the inner-layer porous structure (8) is 0.4-0.8 mm, and the porosity of the inner-layer porous structure (8) is 70%-80%.

9. The 3D-printed porous structure acetabular cup of claim 1, wherein, The size of the cubic unit is 0.4-0.8 mm, the through hole on the cubic unit is an arc-shaped through hole close to a triangle, and the aperture of the through hole is 0.2-0.5 mm.

10. The 3D-printed porous structure acetabular cup of claim 1, wherein, The length of the rod splice is 0.3-0.7 mm, and the diameter of the rod splice is 0.05-0.15 mm.

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