3D-printed winged acetabular cup and method of making the same

Abstract

The application provides a 3D printing winged hip cup and a preparation method thereof, and specifically comprises: a hip cup, which is a hollow hemisphere; a guide rail groove, which is an annular groove arranged at the bottom of the hip cup and provided with an outer slide rail and an inner groove; a wing plate, which is provided with a second screw hole and an expansion component at the front part; and a connecting device, which comprises a connecting rod arranged between the sliding ball and the wing plate; the sliding ball is a hollow sphere with an opening on the surface and is arranged on the outer slide rail; the right side of the connecting rod is provided with a clamping block; the left side of the inside of the sliding ball is further provided with a limiting ball; the right side of the inside of the sliding ball is provided with a push rod, which is arranged symmetrically upward and downward and is hingedly connected with the connecting rod; and the inside of the sliding ball is further provided with a fixing device. The technical scheme of the application effectively solves the problems that the wing plate of the winged hip cup cannot cope with complex bone defect conditions and the stability of the prosthesis is insufficient after being implanted into the human body.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of medical devices, in particular, to a winged acetabular cup and a preparation method thereof. BACKGROUND

[0002] Total Hip Arthroplasty (THA) is one of the most effective surgical methods for treating end-stage hip diseases (such as osteoarthritis, osteonecrosis of the femoral head, developmental dysplasia of the hip, traumatic arthritis, etc.), which can significantly relieve pain and restore joint function. As a key component of the hip prosthesis, the long-term stability of the acetabular cup directly determines the success of the surgery and the long-term quality of life of the patient.

[0003] For hip revision surgery or primary surgery with severe bone defects, the above problems become particularly prominent. The standard acetabular cup currently used in clinical practice cannot cope with complex bone defect morphology at all, so some products provide an integrated upper fixation wing plate that can enhance overall stability and prevent prosthesis subsidence, but its shape, size, and angle are fixed and cannot adapt to all cases. Surgeons often need to cut a large amount of bone to fit the wing plate, sacrificing valuable bone stock.

[0004] Therefore, a new 3D-printed winged acetabular cup is needed to enable the prosthesis to adapt to the shape and location of the defective bone while enhancing overall stability. SUMMARY

[0005] The main purpose of the present application is to provide a 3D-printed winged acetabular cup to solve the problem that the wing plate cannot cope with complex bone defects and the prosthesis is not stable enough after being implanted in the human body.

[0006] In order to achieve the above-mentioned purpose, the application provides a 3D printed winged hip cup and a preparation method thereof, which specifically comprises: a hip cup, which is a hollow hemisphere with a first screw hole on the surface; a guide rail groove, which is an annular groove arranged on the bottom of the hip cup and combined with the hip cup, and is provided with an outer slide rail and an inner groove; a wing plate, which is provided with a second screw hole, and is provided with an expansion component at the front part, and is further provided with a fixing groove penetrating through the expansion component; and a connecting device, which comprises a connecting rod arranged between the sliding ball and the wing plate, wherein the sliding ball is a hollow sphere with an opening on the surface, is arranged on the outer slide rail, and the connecting rod is inserted into the sliding ball from the opening; the right side of the connecting rod is provided with a detent block, which is a triangular prism and is symmetrically arranged up and down and is connected by a first spring in the middle; the left side of the inner part of the sliding ball is further provided with a limiting ball, and the right inner part of the sliding ball is provided with a push rod, which is symmetrically arranged up and down and is hingedly connected with the connecting rod through a rotating device; and the inner part of the sliding ball is further provided with a fixing device, which is symmetrically arranged up and down and is provided with a blocking device at the top.

[0007] Further, the surface of the hip cup has a 3D printed trabecular bone structure.

[0008] Further, the diameter of the outer slide rail of the guide rail groove is the same as the diameter of the sliding ball, and the diameter of the inner groove is the same as the diameter of the limiting ball.

[0009] Further, the surface of the wing plate is an arc shape that fits the bone surface, and the surface has a porous structure, the porosity and pore size of which can be individually designed according to the load-bearing requirement, and the surface structure of the expansion component is a circular arc shape consistent with the surface of the hip cup.

[0010] Further, the materials of the expansion component, the sliding ball and the limiting ball are shape memory alloys that will expand after being implanted into the human body and feeling the body temperature.

[0011] Further, the opening on the surface of the sliding ball is a first opening and a second opening, the first opening is circular and has the same diameter as the limiting ball, and the second opening is symmetrically arranged up and down and has a rectangular shape, which is the same size and shape as the top of the fixing device.

[0012] Further, the middle of the upper push rod and the lower push rod is provided with a second spring for connection.

[0013] Further, the detent block is a triangular prism, and the blocking device at the top of the fixing device is a sawtooth structure, and the bottom is a hemispherical protrusion.

[0014] According to another aspect of the application, a 3D printing preparation method is provided for preparing the above-mentioned hip cup and the matching wing plate and the like, which comprises the following steps:

[0015] S1: design a hip cup body matched with the remaining healthy bone bed, select titanium alloy powder, and use 3D printing to integrally print the hip cup and the guide rail groove, and the bone trabecula structure is arranged on the contact surface of the hip cup and the autologous bone;

[0016] S2: design a connecting device matched with the size of the guide rail groove, select titanium alloy powder and shape memory alloy powder, and use 3D printing to respectively print the components of different materials in the connecting device and combine them;

[0017] S3: select titanium alloy powder, and use 3D printing to integrally print the wing plate;

[0018] S4: assemble the hip cup and the guide rail groove combination with the connecting device.

[0019] Compared with the existing integrated design of the hip cup with the wing plate, the present application uses the 3D printing method to respectively manufacture the hip cup and the guide rail groove through the modular design, the wing plate is movably connected with the guide rail groove through the specially designed connecting device, the sliding ball on the connecting device is designed to enable the wing plate to slide and adjust the position on the guide rail groove, and the angle of the wing plate can be adjusted within a certain range according to the healthy bone position, so that the wing plate can adapt to the shape of the defective bone and avoid cutting more healthy bone, after the position of the wing plate is determined, the internal fixing device of the connecting device is pushed out to contact the guide rail groove to play a limiting and fixing role, and the sliding ball, the limiting ball and the expansion component and the like printed by using the shape memory alloy powder through 3D printing are expanded with the temperature rising after being implanted and fixed, to further improve the stability between the connecting components and enhance the overall stability of the prosthesis. Therefore, the present application can effectively solve the problems that the wing plate of the existing integrated design of the hip cup with the wing cannot cope with the complex bone defect and the stability of the prosthesis is insufficient after being implanted into the human body. BRIEF DESCRIPTION OF DRAWINGS

[0020] The drawings accompanying the specification of this application form a part thereof, serve to provide further understanding of the application, and together with the description of the exemplary embodiments of the application given below, make an explanation of the application, and do not constitute an improper limitation on the application. In the drawings:

[0021] Figure 1 A perspective view of the hip cup and wing plate combination is shown;

[0022] Figure 2 A side view of the guide rail groove-connecting device-wing plate combination is shown;

[0023] Figure 3 A sectional view of the guide rail groove is shown;

[0024] Figure 4 A sectional view of the wing plate-connecting device combination is shown;

[0025] Wherein, the above-mentioned drawings include the following reference signs: 1, acetabular cup; 10, first screw hole; 2, guide rail groove; 20, outer slide rail; 21, inner recess; 3, wing plate; 30, second screw hole; 31, expansion component; 32, fixing groove; 4, connecting device; 40, connecting rod; 41, sliding ball; 410, first opening; 411, second opening; 42, limiting ball; 43, clamping block; 430, first spring; 44, pushing rod; 440, rotating device; 441, second spring; 45, fixing device; 450, blocking device; 451, semispherical protrusion. DETAILED DESCRIPTION

[0026] 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. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. The description of the at least one exemplary embodiment is actually only illustrative, but not intended to limit the present application and its application or use in any way. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of the present application.

[0027] It should be noted that the terms used herein are only intended to describe specific embodiments, and are not intended to limit exemplary embodiments according to the present application. As used herein, the singular form is intended to include the plural form, unless the context clearly indicates otherwise, and it should also be understood that when the terms "comprise" and / or "include" are used in the specification, there is a feature, step, operation, device, component and / or combination thereof.

[0028] Unless specifically stated otherwise, the relative arrangement of components and steps, numerical expressions, and numerical values set forth in the various embodiments described herein are not meant to limit the scope of the present application. At the same time, it should be understood that the sizes of the various parts shown in the drawings are not drawn in proportion. The techniques, methods and devices known to those of ordinary skill in the relevant art can not be discussed in detail, but should be considered as part of the specification when appropriate. In all examples shown and discussed herein, any specific value should be interpreted as merely exemplary, and not as a limitation. Therefore, other examples of exemplary embodiments can have different values. It should be noted that similar reference signs and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0029] As Figures 1-4As shown: a 3D printing winged hip cup, including a hip cup 1, the hip cup is a hollow hemisphere, the surface has a first screw hole 10; guide rail groove 2, the guide rail groove is an annular groove, which is arranged at the bottom of the hip cup 1 and is combined with the hip cup, the guide rail groove is provided with an outer slide rail 20 and an inner groove 21; wing plate 3, the wing plate is provided with a second screw hole 30, the front part of the wing plate is provided with an expansion component 31, and the wing plate is also provided with a fixing groove 32 penetrating the expansion component; connecting device 4, the connecting device comprises: connecting rod 40, the connecting rod is arranged between sliding ball 41 and wing plate 3; the sliding ball 41 is a hollow sphere with an opening on the surface, which is placed on the outer slide rail 20, and the connecting rod 40 is inserted into the sliding ball from the opening of the sliding ball; the right side of the connecting rod is provided with a clamping block 43, which is a triangular prism, symmetrically arranged up and down, and connected by a first spring 430 in the middle; the left side of the sliding ball is also provided with a limiting ball 42, which is extended through the first opening 410 on the sliding ball, and the right side of the sliding ball is provided with a push rod 44, which is symmetrically arranged up and down, and connected by a second spring 441 between the upper push rod and the lower push rod, and hinged with the connecting rod 40 through a rotating device 440; the sliding ball 41 is also provided with a fixing device 45, which is symmetrically arranged up and down, and provided with a blocking device 450 at the top, which is a sawtooth structure, and provided with a hemispherical protrusion 451 at the bottom of the fixing device, which is extended through the second opening 411 on the sliding ball.

[0030] When using 3D printing method to prepare parts, the steps include:

[0031] S1 design a hip cup body matched with the remaining healthy bone bed, select titanium alloy powder, and use 3D printing to integrally print the hip cup and the guide rail groove, and the contact surface of the hip cup and the autologous bone is provided with a trabecular structure;

[0032] S2 design a connecting device matched with the size of the guide rail groove, select titanium alloy powder and shape memory alloy powder, and use 3D printing to print the parts of different materials in the connecting device and combine them;

[0033] S3 select titanium alloy powder, and use 3D printing to integrally print the wing plate;

[0034] S4 assemble the hip cup and guide rail groove combination with the connecting device.

[0035] As Figure 1 shown, the bottom of the hip cup 1 is provided with a guide rail groove 2, the wing plate 3 is connected with the guide rail groove through the connecting rod 40, and the hip cup is provided with three pairs of wing plates, which can adjust the number and shape of the wing plates according to needs.

[0036] As Figure 2As shown, the guide rail groove 2 is located at the bottom of the acetabular cup 1. The guide rail groove 2 is provided with an outer slide rail 20 and an inner groove 21. The wing plate 3 and the expansion component 31 are connected to the sliding ball through the connecting rod 40. The sliding ball can slide in a circle on the guide rail groove through the outer slide rail 20, driving the wing plate 3 to slide in a circle around the acetabular cup. At the same time, the wing plate can be adjusted in an angle within a certain range to adapt to the height of the healthy bone.

[0037] like Figure 3 As shown, the guide rail groove 2 is provided with an outer slide rail 20 and an inner groove 21. The diameter of the outer slide rail is the same as the diameter of the sliding ball 41, and the inner groove 21 is two consecutive arcs with the same diameter as the limiting ball 42.

[0038] like Figure 4 As shown, the connecting rod 40 is connected to the wing plate 3 and the expansion component 31 through the fixing groove 32. When the connecting rod 40 is pushed to the designated position, the locking block 43 is pushed out to the fixing groove by the first spring 430 to restrict the movement of the wing plate. After the wing plate is in the determined position and angle, it pushes the connecting rod 40 to move into the sliding ball. During the process of the connecting rod driving the push rod 44 to move inward, the second spring 441 gradually opens the push rod, thereby pushing the fixing device 45 to move up and down to both sides, so that the blocking device 450 extends out through the second opening 411 on the sliding ball and contacts the outer slide rail 20 on the guide rail groove to enhance the fixation. At the same time, when the push rod 44 is opened, it contacts the limiting ball 42 and pushes the limiting ball to extend out through the first opening 410 and contact the inner groove to enhance the fixation.

[0039] In use, the guide rail groove and acetabular cup are first printed as a single unit. The acetabular cup is then placed into the acetabulum. Next, the wing plate is connected to the guide rail groove via a uniquely designed connecting device. The sliding ball design on the connecting device allows the wing plate to slide and adjust its position on the guide rail groove. At the same time, the angle of the wing plate can be adjusted within a certain range according to the position of the healthy bone, so that the wing plate can adapt to the shape of the defective bone and avoid reducing more healthy bone volume. After determining the position of the wing plate, the fixing device inside the connecting device is pushed out to contact the guide rail groove to play a limiting and fixing role. At the same time, the sliding ball, limiting ball, and expansion components, which are 3D printed using shape memory alloy powder, expand as the temperature rises after implantation and fixation, which can further improve the stability between the connecting components and enhance the overall stability of the prosthesis.

[0040] In summary, the present invention utilizes a 3D-printed winged acetabular cup, where the wing plate can be adjusted in position and angle according to the location of bone lesions to address complex bone defects, while also enhancing prosthesis stability and preventing prosthesis subsidence.

[0041] In the description of the application, it needs to be understood that the orientation words such as "front, back, upper, lower, left, right", "transverse, vertical, perpendicular, horizontal" and "top, bottom" and the like indicated orientation or position relationship is generally based on the orientation or position relationship shown in the drawings, only for the convenience of describing the application and simplifying the description, without making the opposite statement, these orientation words do not indicate and imply that the device or element indicated must have a particular orientation or be constructed and operated in a particular orientation, therefore, it cannot be understood as a limitation on the scope of protection of the application; the orientation words "inner, outer" refer to the inner and outer relative to the contour of each component.

[0042] For the convenience of description, spatial relative terms such as "over", "above", "upper surface", "upper" and the like can be used herein to describe the spatial position relationship of one device or feature with other devices or features as shown in the drawings. It should be understood that the spatial relative terms are intended to include different orientations in use or operation in addition to the orientation of the device described in the drawings. For example, if the device in the drawing is inverted, the device described as "above" or "over" other devices or structures will be positioned "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below" orientations. The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein are interpreted accordingly.

[0043] In addition, it needs to be pointed out that the use of "first", "second" and the like to define parts is only for the convenience of distinguishing the corresponding parts, and the above words have no special meaning unless otherwise stated, therefore, it cannot be understood as a limitation on the scope of protection of the application.

[0044] The above only describes the preferred embodiments of the application and is not intended to limit the application. For those skilled in the art, the application can have various modifications and changes. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the application shall be included in the protection scope of the application.

Claims

1. A 3D-printed winged acetabular cup, characterized in that, include: The acetabular cup (1) is a hollow hemisphere with a first screw hole (10) on its surface. The guide groove (2) is an annular groove and is provided at the bottom of the acetabular cup (1). The guide groove is provided with an outer slide rail (20) and an inner groove (21). The wing plate (3) is provided with a second screw hole (30), the front part of the wing plate is provided with an expansion component (31), and the wing plate is also provided with a fixing groove (32) that passes through the expansion component. Connecting device (4), the connecting device comprising: A connecting rod (40) is movably connected to the wing plate (3); A sliding ball (41), which is a hollow sphere with an opening on its surface, is placed on the outer slide rail (20), and a connecting rod (40) is inserted into the sliding ball. A limiting ball (42) is disposed inside the sliding ball (41). The locking block (43) is located on the right side of the connecting rod (40), symmetrically arranged vertically, and connected in the middle by a first spring (430). The push rod (44) is symmetrically arranged vertically and is hinged to the connecting rod (40) via a rotating device (440). The fixing device (45) is arranged symmetrically on the top and bottom, and is located inside the sliding ball (41). A blocking device (450) is provided on the top.

2. The winged acetabular cup according to claim 1, characterized in that, The surface of the acetabular cup (1) has a 3D-printed trabecular bone structure.

3. The winged acetabular cup according to claim 1, characterized in that, The outer slide rail (20) of the guide rail groove (2) has the same diameter as the sliding ball (41), and the inner groove (21) has the same diameter as the limiting ball (42).

4. The winged acetabular cup according to claim 1, characterized in that, The surface of the wing plate (3) is an arc shape that fits the bone surface, and the surface has a porous structure. Its porosity and pore size are designed according to the load-bearing requirements. The surface structure of the expansion component (31) is an arc shape that is consistent with the surface of the acetabular cup (1).

5. The winged acetabular cup according to claim 1, characterized in that, The expansion component (31), sliding ball (41) and limiting ball (42) are made of shape memory alloy.

6. The winged acetabular cup according to claim 1, characterized in that, The sliding ball (41) is provided with a first opening (410) and a second opening (411). The first opening is circular and has the same diameter as the limiting ball. The second opening is symmetrically arranged vertically and is rectangular in shape, with the same size and shape as the top of the fixing device (45).

7. The winged acetabular cup according to claim 1, characterized in that, The push rod (44) is connected by a second spring (441) in the middle.

8. The winged acetabular cup according to claim 1, characterized in that, The locking block (43) is a triangular prism, the top blocking device (450) of the fixing device (45) is a sawtooth structure, and the bottom is a hemispherical protrusion (451).

9. A method for manufacturing a 3D-printed winged acetabular cup according to any one of claims 1-8, characterized in that, Includes the following steps: S1: The design of the acetabular cup body is matched with the remaining healthy bone bed. Titanium alloy powder is selected, and the acetabular cup and guide groove are printed in one piece using 3D printing. The contact surface between the acetabular cup and the autologous bone is provided with a trabecular structure. S2: Design a connection device that matches the size of the guide rail groove. Select titanium alloy powder and shape memory alloy powder, and use 3D printing to print the components of different materials in the connection device and assemble them. S3: Titanium alloy powder is selected, and the wing plate is printed in one piece using 3D printing. S4: Assemble the acetabular cup and guide rail groove assembly with the connecting device.

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