3D printed chimeric titanium-magnesium alloy bone repair body

Abstract

The utility model relates to a kind of 3D printing's embedded titanium-magnesium alloy bone repair body, belong to bone repair body field, solve the existing single titanium alloy bone repair body elastic modulus and human skeleton difference in prior art is larger, it is prone to stress shielding effect, and the single magnesium alloy bone repair body mechanical strength and corrosion resistance is poor.The utility model includes titanium alloy cylinder, magnesium alloy structure and inlay structure, magnesium alloy structure is connected with titanium alloy cylinder by inlay structure;Multiple evenly distributed inlay grooves are equipped along the circumference of titanium alloy cylinder, both sides of inlay groove are equipped with directional slide, magnesium alloy structure is arranged in inlay groove, both sides of magnesium alloy structure are equipped with limit protrusion, limit protrusion and directional slide sliding connection.The utility model inlay magnesium alloy structure in titanium alloy cylinder, rely on titanium alloy cylinder to provide mechanical support, magnesium alloy structure gradually degrades to promote bone growth, the defect of single material is effectively avoided by the combination of both.

Description

Technical Field

[0001] This utility model relates to the field of bone repair technology, and in particular to a 3D-printed interlocking titanium-magnesium alloy bone repair. Background Technology

[0002] Bone prostheses are widely used in clinical medicine for fracture repair and bone defect filling. Traditional bone prostheses are mostly made of a single material, such as titanium alloys or magnesium alloys. Although they possess certain mechanical properties and biocompatibility, some problems still exist. For example, while titanium alloys have high strength and good corrosion resistance, their elastic modulus differs significantly from that of human bone, which can easily lead to stress shielding effects. Magnesium alloys, although possessing good biodegradability and an elastic modulus similar to that of bone, have poor mechanical strength and corrosion resistance. Utility Model Content

[0003] Based on the above analysis, the present invention aims to provide a 3D-printed interlocking titanium-magnesium alloy bone prosthesis to solve the problems of existing single titanium alloy bone prostheses having a large difference in elastic modulus from human bone, which easily leads to stress shielding effect, and single magnesium alloy bone prostheses having poor mechanical strength and corrosion resistance.

[0004] The objective of this utility model is mainly achieved through the following technical solutions:

[0005] A 3D-printed interlocking titanium-magnesium alloy bone repair body includes a titanium alloy column, a magnesium alloy structure, and an inlay structure, wherein the magnesium alloy structure is connected to the titanium alloy column through the inlay structure.

[0006] The titanium alloy column has multiple evenly distributed inlay grooves along its circumference. Each side wall of the inlay groove is provided with a directional slide. The magnesium alloy structure is disposed in the inlay groove. Each side of the magnesium alloy structure is provided with a limiting protrusion. The limiting protrusion is slidably connected to the directional slide.

[0007] Furthermore, the titanium alloy column is also provided with a storage groove, which is connected to the directional slide, and the inlay structure is disposed in the storage groove.

[0008] Furthermore, the limiting protrusion is provided with a positioning groove, which is connected to the inlay structure.

[0009] Furthermore, the inlay structure includes a titanium alloy spring plate and a positioning plate, wherein the titanium alloy spring plate is fixedly installed in the storage groove, and the positioning plate is slidably installed in the storage groove.

[0010] Furthermore, one side of the positioning plate contacts the titanium alloy spring plate, and the other side is used to engage with the positioning groove.

[0011] Furthermore, the titanium alloy spring plate is an arc-shaped plate.

[0012] Furthermore, the titanium alloy column and the magnesium alloy structure are connected to form a cylindrical structure.

[0013] Furthermore, both the titanium alloy column and the magnesium alloy structure are provided with multiple irregularly distributed holes, the diameter of which is 600μm.

[0014] Furthermore, the porosity of both the titanium alloy column and the magnesium alloy structure is 55%.

[0015] Furthermore, the titanium alloy column, the titanium alloy spring plate, and the positioning plate are all made of Ti6Al4V titanium alloy, and the magnesium alloy structure is made of WE43 magnesium alloy.

[0016] Compared with the prior art, the present invention can achieve at least one of the following beneficial effects:

[0017] (1) In this invention, a magnesium alloy structure is embedded in a titanium alloy column. The titanium alloy column and the magnesium alloy structure are connected by the embedding structure. The titanium alloy column provides mechanical support, and the magnesium alloy structure gradually degrades to promote bone growth. The combination of the two effectively avoids the defects of a single material. Moreover, the magnesium alloy structure gradually degrades in the body, while the titanium alloy column remains stable, thus achieving controllable degradation of the bone repair and avoiding the need for a second surgery to remove it.

[0018] (2) This utility model restricts the lateral sliding of the magnesium alloy structure by using the combination of the limiting protrusion and the directional slide, thereby preventing the magnesium alloy structure from sliding relative to the titanium alloy column under the action of external force, thus increasing the stability of the magnesium alloy structure; the combination of the locking plate and the positioning groove can restrict the vertical sliding of the magnesium alloy structure, preventing the magnesium alloy structure from being pushed out under the action of external force, ensuring a stable connection between the magnesium alloy structure and the titanium alloy column, realizing the precise positioning of the magnesium alloy structure, and avoiding installation errors.

[0019] (3) One side of the positioning plate of this utility model is in contact with the titanium alloy spring plate, and the other side is used to connect with the positioning groove. The shape of the titanium alloy spring plate can generate elastic deformation when it is squeezed by external force, thereby providing sufficient pre-tightening force, increasing the squeezing force on the positioning plate, and increasing the pre-tightening force of the titanium alloy spring plate. It has good elasticity and fatigue resistance. The elastic design of the titanium alloy spring plate can effectively absorb vibration and improve the vibration resistance of the overall structure.

[0020] In this invention, the above-described technical solutions can be combined with each other to achieve more preferred combinations. Other features and advantages of this invention will be set forth in the following description, and some advantages will become apparent from the description or be learned by practicing this invention. The objectives and other advantages of this invention can be realized and obtained from the details specifically pointed out in the text and accompanying drawings. Attached Figure Description

[0021] The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of the invention. Throughout the drawings, the same reference numerals denote the same parts.

[0022] Figure 1 This is a schematic diagram of the structure of the inlay titanium-magnesium alloy bone repair body according to a specific embodiment;

[0023] Figure 2 This is a schematic diagram of the structure of the interlocking titanium-magnesium alloy bone prosthesis in the uninterlocked state according to a specific embodiment.

[0024] Figure 3 This is a schematic diagram of the connection structure between the magnesium alloy structure and the titanium alloy column in a specific embodiment.

[0025] Figure 4 This is a schematic diagram showing the connection between the inlay structure and the magnesium alloy structure and titanium alloy column in a specific embodiment.

[0026] Figure 5 This is a schematic diagram of the structure of the titanium alloy spring plate in a specific embodiment.

[0027] Figure label:

[0028] 1-Titanium alloy column; 11-Inlay groove; 12-Directional slide; 13-Storage groove; 2-Magnesium alloy structure; 21-Limiting protrusion; 22-Positioning groove; 3-Inlay structure; 31-Titanium alloy spring plate; 32-Card plate; 4-Hole. Detailed Implementation

[0029] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, which constitute a part of the present invention and are used together with the embodiments of the present invention to illustrate the principles of the present invention, but are not intended to limit the scope of the present invention.

[0030] A specific embodiment of this utility model, combined with Figure 1 , Figure 2 and Figure 3As shown, a 3D-printed interlocking titanium-magnesium alloy bone repair body is disclosed, including a titanium alloy column 1, a magnesium alloy structure 2, and an inlay structure 3. The magnesium alloy structure 2 is connected to the titanium alloy column 1 through the inlay structure 3. Multiple evenly distributed inlay grooves 11 are provided along the circumference of the titanium alloy column 1. Directional sliding channels 12 are provided on both sides of the inner wall of each inlay groove 11. The magnesium alloy structure 2 is disposed in the inlay groove 11. Limiting protrusions 21 are provided on both sides of the magnesium alloy structure 2. The limiting protrusions 21 cooperate with the directional sliding channels 12 and can slide along the directional sliding channels 12.

[0031] During implementation, the magnesium alloy structure 2 is inserted into the inlay groove 11, and after the magnesium alloy structure 2 and the titanium alloy column 1 are properly engaged, the inlay structure 3 will be inserted into the magnesium alloy structure 2 to fix the magnesium alloy structure 2.

[0032] Compared with the prior art, the inlay-type titanium-magnesium alloy bone repair body provided in this embodiment has a magnesium alloy structure 2 embedded in a titanium alloy column 1. The titanium alloy column 1 and the magnesium alloy structure 2 are connected by an inlay structure 3. The titanium alloy column 1 provides mechanical support, while the magnesium alloy structure 2 gradually degrades to promote bone growth. The combination of the two effectively avoids the defects of a single material. Moreover, the magnesium alloy structure 2 gradually degrades in vivo while the titanium alloy column 1 remains stable, realizing the controllable degradation of the bone repair body and avoiding the need for a second surgery to remove it.

[0033] In this embodiment, the titanium alloy column 1 serves as the main load-bearing structure, possessing high strength and high corrosion resistance, while the inlay structure 3 provides excellent shock absorption performance. The inlay structure 3 secures the inlaid titanium alloy column 1 and magnesium alloy structure 2, preventing relative sliding during installation. The inlay groove 11 provides space for the inlay of the magnesium alloy structure 2, guiding and securing the inlay structure 3.

[0034] Combination Figure 3 and Figure 4 As shown, the titanium alloy column 1 also has a storage groove 13, which is connected to the directional slide 12, and the inlay structure 3 is set in the storage groove 13. Figure 2 As shown, the length direction of the inlay groove 11 is consistent with the length direction of the titanium alloy column 1. The directional slide 12 is provided along the length direction of the inlay groove 11. The receiving groove 13 has multiple layers along the height direction of the titanium alloy column 1. In other words, two receiving grooves 13 are symmetrically distributed on both sides of the inlay groove 11, and the adjacent edges of the receiving groove 13 and the inlay groove 11 are provided with directional slides 12, connecting the inlay groove 11 and the receiving groove 13 through the directional slides 12. The receiving groove 13 is used to receive the inlay structure 3.

[0035] In this embodiment, directional slides 12 are provided on both sides of the inlay groove 11. The directional slides 12 serve as guides for the sliding and installation of the magnesium alloy structure 2. A multi-layered storage groove 13 communicating with the directional slides 12 is provided along the length of the titanium alloy column 1. The storage groove 13 provides space for the installation of the inlay structure 3 and at the same time limits the sliding range of some parts of the inlay structure 3.

[0036] Considering its compatibility with the inlay structure 3 and the directional slide 12, combined with Figure 3 and Figure 4 As shown, a positioning groove 22 is provided on the limiting protrusion 21, and the inlay structure 3 is adapted to the positioning groove 22. In this embodiment, the cooperation between the limiting protrusion 21 and the directional slide 12 restricts the lateral sliding of the magnesium alloy structure 2, preventing the magnesium alloy structure 2 from sliding relative to the titanium alloy column 1 under the action of external force, thereby increasing the stability of the magnesium alloy structure 2; the positioning groove 22, in cooperation with the inlay structure 3, enables the inlay structure 3 to restrict the longitudinal movement of the magnesium alloy structure 2. It should be noted that lateral refers to the direction perpendicular to the length of the titanium alloy column 1. Longitudinal refers to the length of the titanium alloy column 1.

[0037] In order to restrict the positioning of magnesium alloy structure 2, such as Figure 4 As shown, the inlay structure 3 includes a titanium alloy spring plate 31 and a positioning plate 32. The titanium alloy spring plate 31 is fixedly installed in the storage groove 13, and the positioning plate 32 is slidably installed in the storage groove 13. One side of the positioning plate 32 contacts the titanium alloy spring plate 31, and the other side is used to connect with the positioning groove 22. The titanium alloy spring plate 31 undergoes elastic deformation after being compressed, providing a pre-tightening force. The limiting protrusion 21 is inserted into the directional slide 12. When the positioning groove 22 is aligned with the positioning plate 32, the positioning plate 32 is engaged in the positioning groove 22.

[0038] In this embodiment, the cooperation between the locking plate 32 and the positioning groove 22 can restrict the vertical sliding of the magnesium alloy structure 2, prevent the magnesium alloy structure 2 from being pushed out under the action of external force, ensure the stable connection between the magnesium alloy structure 2 and the titanium alloy column 1, realize the precise positioning of the magnesium alloy structure 2, and avoid installation errors.

[0039] When printing the titanium alloy column 1, install the titanium alloy spring plate 31 and the positioning plate 32. When installing the magnesium alloy structure 2, squeeze the positioning plate 32 to make it disengage from the directional slide 12 and enter the interior of the receiving groove 13. Then, when the magnesium alloy structure 2 is inserted, the positioning plate 32 is restricted by the limiting protrusion 21 and cannot be pushed out. After the magnesium alloy structure 2 is installed, the positioning groove 22 will correspond to the positioning plate 32, the stress of the titanium alloy spring plate 31 will be released, and the positioning plate 32 will be pushed out and inserted into the interior of the positioning groove 22.

[0040] Preferably, the titanium alloy column 1, the titanium alloy spring plate 31, and the positioning plate 32 are all made of Ti6Al4V titanium alloy, and the magnesium alloy structure 2 is made of WE43 magnesium alloy. Both the titanium alloy column 1 and the magnesium alloy structure 2 are customized 3D-printed structures. Ti6Al4V is a widely used high-strength titanium alloy with excellent specific strength, corrosion resistance, and fatigue resistance. WE43 is a high-performance magnesium alloy with good strength, heat resistance, and corrosion resistance. 3D printing technology allows for flexible adjustment of the structural design and optimization of performance according to actual application requirements.

[0041] like Figure 5 As shown, the titanium alloy spring plate 31 is generally arc-shaped, and its vertical cross-section is also arc-shaped. In other words, the titanium alloy spring plate 31 is similar to a section of a tire, having an arc not only in its length direction but also in its width. The shape of the titanium alloy spring plate 31 allows it to undergo elastic deformation under external pressure, thus providing sufficient preload. This increases the pressure on the locking plate 32 and further enhances the preload of the titanium alloy spring plate 31, exhibiting good elasticity and fatigue resistance. The elastic design of the titanium alloy spring plate 31 effectively absorbs vibrations, improving the overall structure's vibration resistance.

[0042] like Figure 1 As shown, the titanium alloy column 1 and magnesium alloy structure 2 form a cylindrical shape after assembly. Both the titanium alloy column 1 and magnesium alloy structure 2 have multiple irregularly distributed holes 4. The holes 4 have a diameter of 600 μm and a porosity of 55%. The size (i.e., length) of the holes 4 is not fixed and can vary. The 600 μm diameter of the holes 4 effectively reduces the weight of the bone repair while ensuring structural strength. The 55% porosity means that the volume of the holes 4 accounts for 55% of the total volume. This porosity achieves a good balance between lightweighting and mechanical properties. The irregular distribution of the holes 4 on the titanium alloy column 1 and magnesium alloy structure 2 effectively disperses stress concentration, improves the fatigue resistance of the structure, enhances the overall durability of the structure, and also improves the energy absorption and heat dissipation efficiency of the structure.

[0043] Preferably, irregularly distributed holes 4 are machined on the titanium alloy column 1 and the magnesium alloy structure 2 using laser drilling, electrochemical machining, or 3D printing technology. During the machining process, the hole diameter and porosity must be strictly controlled to ensure structural performance.

[0044] In this embodiment, the titanium alloy column 1 and magnesium alloy structure 2 are machined with irregularly distributed holes 4 using laser drilling, electrochemical processing, or 3D printing technology. When installing the magnesium alloy structure 2, the positioning plate 32 is squeezed to disengage from the directional slide 12 and enter the interior of the receiving groove 13. When the magnesium alloy structure 2 is inserted, the positioning plate 32 is restricted by the limiting protrusion 21 and cannot be pushed out. After the magnesium alloy structure 2 is installed, the positioning groove 22 will correspond to the positioning plate 32, the stress of the titanium alloy spring plate 31 will be released, and the positioning plate 32 will be pushed out and inserted into the interior of the positioning groove 22.

[0045] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present utility model should be included within the protection scope of the present utility model.

Claims

1. A 3D-printed interlocking titanium-magnesium alloy bone repair body, characterized in that, It includes a titanium alloy column (1), a magnesium alloy structure (2) and an inlay structure (3), wherein the magnesium alloy structure (2) is connected to the titanium alloy column (1) through the inlay structure (3); Multiple uniformly distributed inlay grooves (11) are provided along the circumference of the titanium alloy column (1). The two side walls of the inlay grooves (11) are provided with directional slides (12). The magnesium alloy structure (2) is disposed in the inlay grooves (11). The two sides of the magnesium alloy structure (2) are provided with limiting protrusions (21). The limiting protrusions (21) are slidably connected to the directional slides (12).

2. The 3D-printed interlocking titanium-magnesium alloy bone repair body according to claim 1, characterized in that, The titanium alloy column (1) is also provided with a storage groove (13), which is connected to the directional slide (12), and the inlay structure (3) is disposed in the storage groove (13).

3. The 3D-printed interlocking titanium-magnesium alloy bone repair body according to claim 2, characterized in that, The limiting protrusion (21) is provided with a positioning groove (22), which is connected to the inlay structure (3).

4. The 3D-printed interlocking titanium-magnesium alloy bone repair body according to claim 3, characterized in that, The inlay structure (3) includes a titanium alloy spring plate (31) and a positioning plate (32). The titanium alloy spring plate (31) is fixedly installed in the storage groove (13), and the positioning plate (32) is slidably installed in the storage groove (13).

5. The 3D-printed interlocking titanium-magnesium alloy bone repair body according to claim 4, characterized in that, One side of the positioning plate (32) contacts the titanium alloy spring plate (31), and the other side is used to engage with the positioning groove (22).

6. The 3D-printed interlocking titanium-magnesium alloy bone repair body according to claim 4, characterized in that, The titanium alloy spring plate (31) is an arc-shaped plate.

7. The 3D-printed interlocking titanium-magnesium alloy bone repair body according to any one of claims 1-6, characterized in that, The titanium alloy column (1) and the magnesium alloy structure (2) are connected to form a cylindrical structure.

8. The 3D-printed interlocking titanium-magnesium alloy bone repair body according to any one of claims 1-6, characterized in that, Both the titanium alloy column (1) and the magnesium alloy structure (2) are provided with multiple irregularly distributed holes (4), and the diameter of the holes (4) is 600 μm.

9. The 3D-printed interlocking titanium-magnesium alloy bone repair body according to claim 8, characterized in that, The porosity of both the titanium alloy column (1) and the magnesium alloy structure (2) is 55%.

10. The 3D-printed interlocking titanium-magnesium alloy bone repair body according to any one of claims 4-6, characterized in that, The titanium alloy column (1), the titanium alloy spring plate (31) and the positioning plate (32) are all made of Ti6Al4V titanium alloy, and the magnesium alloy structure (2) is made of WE43 magnesium alloy.

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