Artificial tibia with multi-material composite structure

Abstract

An artificial tibia of a multi-material composite structure comprises a near-end tibia, a cancellous bone screw, a near-end bone fracture plate, spinous protrusions, a near-end dot matrix and a middle segment dot matrix. The system comprises a far-end dot matrix, a far-end bone fracture plate, a cortical bone screw, a far-end tibia, a near-end 100% tantalum area, a near-end 75% tantalum-25% titanium alloy area, a near-end 50% tantalum-50% titanium alloy area, a near-end 25% tantalum-75% titanium alloy area, a 100% titanium alloy area, a far-end 25% tantalum-75% titanium alloy area, a far-end 50% tantalum-50% titanium alloy area, a far-end 75% tantalum-25% titanium alloy area and a far-end 100% tantalum area. The appearance of the artificial tibia is individually designed according to CT data of a patient, the length of the artificial tibia implanted into the tibia can be accurately recovered, and the artificial tibia is manufactured by adopting transition parts with different tantalum-titanium alloy proportions through a multi-material selective laser melting 3D printer. A main body of the artificial tibia is divided into a near-end part, a middle-section part and a far-end part, and the parts are filled with different types of dot matrixes, so that different functional requirements are met.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the design and manufacture field of artificial tibia, especially relates to a kind of artificial tibia of multi-material composite structure. BACKGROUND

[0002] Tibia is one of the two long bones of lower limbs, located in the medial calf, and together with fibula constitutes the main skeleton of calf. When large segment defect is caused by disease, injury or other reasons, artificial tibia can be implanted to restore the normal function of the limb and improve the quality of life of patients. 3D printing technology can make artificial tibia customized according to CT data of patients, meeting the needs of personalized medical treatment. SUMMARY

[0003] The utility model discloses the purpose at: provide a kind of artificial tibia of multi-material composite structure, macroscopic shape is matched with implant site, internal structure is multi-dot array gradient structure, can satisfy mechanical property and osteogenic property requirement.

[0004] The utility model discloses the technical scheme that the technical problem thereof adopts: a kind of artificial tibia of multi-material composite structure, including proximal tibia, cancellous bone screw, proximal bone plate, thorn-shaped protrusion, proximal dot array, middle segment dot array, distal dot array, distal bone plate, cortical bone screw, distal tibia, proximal 100% tantalum area, proximal 75% tantalum-25% titanium alloy area, proximal 50% tantalum-50% titanium alloy area, proximal 25% tantalum-75% titanium alloy area, 100% titanium alloy area, distal 25% tantalum-75% titanium alloy area, distal 50% tantalum-50% titanium alloy area, distal 75% tantalum-25% titanium alloy area, distal 100% tantalum area. The shape of artificial tibia is personalized designed according to CT data of patients, and the length of tibia implanted can be accurately restored. The artificial tibia is made by multi-material laser selective melting 3D printer.

[0005] The main body of the artificial tibia is divided into proximal portion, middle segment portion and distal portion. The material of the proximal portion and the distal portion is tantalum, and the material of the middle segment portion is titanium alloy (Ti6Al4V). The transition part of the combination of the two materials is a transition part with different tantalum-titanium alloy ratios. In order to improve the bone integration effect of the artificial tibia and the patient's bone, a hydroxyapatite coating is sprayed on the contact surface of tantalum and the patient's bone.

[0006] The transition is realized by changing the material ratio in the junction area of the proximal dot array and the middle segment dot array, and the junction area of the middle segment dot array and the distal dot array. The material ratio of the transition from the proximal dot array to the middle segment dot array is 100% tantalum, 75% tantalum-25% titanium alloy, 50% tantalum-50% titanium alloy, 25% tantalum-75% titanium alloy and 100% titanium alloy in sequence. The transition from the middle segment dot array to the distal dot array is realized by titanium alloy to tantalum with the same ratio, and the length of each double-material transition area is 4 mm.

[0007] The artificial tibia is connected with the proximal tibia of the patient through a proximal bone plate, the proximal bone plate has holes for passing through cancellous bone screws, and the proximal bone plate and the proximal tibia are fixed through the cancellous bone screws. The end surface of the proximal end of the artificial tibia has a spine-shaped protrusion which can be pierced into the contact surface of the proximal tibia of the patient to prevent the artificial tibia from being misaligned. The distal end of the artificial tibia is connected with the distal tibia of the patient through a distal bone plate, the distal bone plate has holes for passing through cortical bone screws, and the distal bone plate and the distal tibia are fixed through the cortical bone screws.

[0008] The internal structure of the proximal end of the artificial tibia is a three-periodic minimal surface lattice structure, the porosity is 70%, and the pore size is 2mm. The high connectivity of the holes and the smooth transition surface are suitable for cell adsorption and growth. The internal structure of the middle section of the artificial tibia is filled with a triangular and longitudinal area lattice, the lattice structure is a truss structure, the porosity is 60%, and the pore size is 1mm. The triangular structure can bear a large load. The internal structure of the distal end of the artificial tibia is a hexagonal lattice structure, the porosity is 70%, and the pore size is 300-500um. The structure has good stability, shock absorption and energy absorption. BRIEF DESCRIPTION OF DRAWINGS

[0009] The utility model will be further explained in connection with the drawings and examples.

[0010] Figure 1 is a schematic diagram of the overall structure and the volume ratio of the gradient structure of the utility model. Figure 1 Figure 1 is a schematic diagram of the overall structure and the volume ratio of the gradient structure of the utility model.

[0011] Figure 1 is a schematic diagram of the overall structure and the volume ratio of the gradient structure of the utility model. Figure 2 Figure 1 is a schematic diagram of the overall structure and the volume ratio of the gradient structure of the utility model.

[0012] Figure 1 is a schematic diagram of the overall structure and the volume ratio of the gradient structure of the utility model. Figure 3 Figure 1 is a schematic diagram of the overall structure and the volume ratio of the gradient structure of the utility model.

[0013] Figure 4 Figure 1 is a schematic diagram of the overall structure and the volume ratio of the gradient structure of the utility model.

[0014] Figure 1 is a schematic diagram of the overall structure and the volume ratio of the gradient structure of the utility model. DETAILED DESCRIPTION​

[0015] In the utility model, in order to be convenient for description, the relative position relation of each component is all described according to the layout mode of the drawing of specification, and the positional relation such as upper, lower, left, right, front, back is determined according to the layout direction of the drawing of specification.

[0016] Embodiment 1: a multi-material composite structure artificial tibia, including proximal tibia 1, cancellous bone screw 2, proximal bone plate 3, thorn-like protrusion 4, proximal lattice 5, middle segment lattice 6, distal end lattice 7, distal end bone plate 8, cortical bone screw 9, distal end tibia 10, proximal 100% tantalum area 11, proximal 75% tantalum-25% titanium alloy area 12, proximal 50% tantalum-50% titanium alloy area 13, proximal 25% tantalum-75% titanium alloy area 14, 100% titanium alloy area 15, distal 25% tantalum-75% titanium alloy area 16, distal 50% tantalum-50% titanium alloy area 17, distal 75% tantalum-25% titanium alloy area 18, distal 100% tantalum area 19.The shape of the artificial tibia is personalized designed according to the CT data of the patient, and the length of the implanted tibia can be accurately restored.The artificial tibia is made by multi-material laser selective melting 3D printer.

[0017] The main body of the artificial tibia is divided into proximal end part, middle segment part and distal end part.Three parts.The material of the proximal end part and the distal end part is tantalum, and the material of the middle segment part is titanium alloy (Ti6Al4V).The combination part of the two materials is the transition part with different tantalum-titanium alloy ratio.In order to improve the bone integration effect of the artificial tibia and the patient's bone, hydroxyapatite coating is sprayed on the contact surface of tantalum and patient's bone.

[0018] The transition is realized by changing the material ratio in the junction area of the proximal lattice 5 and the middle segment lattice 6, and the middle segment lattice 6 and the distal end lattice 7.The material ratio of the transition from the proximal lattice 5 to the middle segment lattice 6 is 100% tantalum, 75% tantalum-25% titanium alloy, 50% tantalum-50% titanium alloy, 25% tantalum-75% titanium alloy and 100% titanium alloy.The transition from the middle segment lattice 6 to the distal end lattice 7 realizes the transition from titanium alloy to tantalum with the same ratio.The length of each double-material transition area is 4mm.

[0019] The artificial tibia is connected with the proximal tibia 1 of the patient through the proximal bone plate 3, and the proximal bone plate 3 has holes for passing through the cancellous bone screw 2, so that the proximal bone plate 3 and the proximal tibia 1 are fixed through the cancellous bone screw 2.The end surface of the proximal end of the artificial tibia has a thorn-like protrusion 4, which can be pierced into the contact surface of the proximal tibia 1 of the patient to prevent the artificial tibia from being misplaced.The distal end of the artificial tibia is connected with the distal end tibia 10 of the patient through the distal end bone plate 8, and the distal end bone plate 8 has holes for passing through the cortical bone screw 9, so that the distal end bone plate 8 and the distal end tibia 10 are fixed through the cortical bone screw 9.

[0020] The internal structure of the artificial proximal tibial lattice 5 is a three-periodic minimal surface lattice structure, with a porosity of 70% and a pore size of 2 mm. The highly connected pores and smooth transition surfaces are suitable for cell adsorption and growth. The internal structure of the artificial middle tibial lattice 6 is a triangular and longitudinal area lattice filling, with a lattice structure of a truss structure, a porosity of 60%, and a pore size of 1 mm. The triangular structure can bear a larger load. The internal structure of the artificial distal tibial lattice 7 is a hexagonal lattice structure, with a porosity of 70% and a pore size of 300-500 um. The structure has good stability, shock absorption, and energy absorption.

[0021] In practical operation, the shape of the artificial tibia is designed according to the CT data of the patient, the shape of the artificial tibia is obtained, the internal lattice structure is designed, the shape of the proximal bone plate 3 and the distal bone plate 8 is determined, and the artificial tibia is produced by laser selective melting 3D printing. Hydroxyapatite is sprayed on the distal and proximal surfaces. The surgeon removes the part of the tibia that needs to be replaced with the artificial tibia according to the preoperative planning scheme, implants the artificial tibia, and fixes it on the patient's tibia with screws.

Claims

1. Artificial tibia of a multi-material composite structure comprising proximal tibia (1), cancellous bone screws (2), proximal bone plate (3), spiky protrusions (4), proximal lattice (5), middle lattice (6), distal lattice (7), distal bone plate (8), cortical bone screws (9), distal tibia (10), proximal 100% tantalum zone (11), proximal 75% tantalum - 25% titanium alloy zone (12), proximal 50% tantalum - 50% titanium alloy zone (13), proximal 25% tantalum - 75% titanium alloy zone (14), 100% titanium alloy zone (15), distal 25% tantalum - 75% titanium alloy zone (16), distal 50% tantalum - 50% titanium alloy zone (17), distal 75% tantalum - 25% titanium alloy zone (18), distal 100% tantalum zone (19), characterized by: The artificial tibia is connected with the proximal tibia (1) of the patient by a proximal bone plate (3), the proximal bone plate (3) has holes for passing through cancellous bone screws (2), the proximal bone plate (3) and the proximal tibia (1) are fixed by the cancellous bone screws (2), the end surface of the proximal end of the artificial tibia has a spiny protrusion (4) which can be inserted into the contact surface of the proximal tibia (1) of the patient to prevent the artificial tibia from being misplaced, the distal end of the artificial tibia is connected with the distal tibia (10) of the patient by a distal bone plate (8), the distal bone plate (8) has holes for passing through cortical bone screws (9), the distal bone plate (8) and the distal tibia (10) are fixed by the cortical bone screws (9).

2. Artificial tibia according to claim 1, characterized in that: The proximal and distal parts are made of tantalum, the middle part is made of titanium alloy Ti6Al4V, the combination part of the two materials is a transition part with different proportions of tantalum-titanium alloy, in order to improve the bone integration effect of the artificial tibia and the patient's bone, a hydroxyapatite coating is sprayed on the contact surface of the tantalum and the patient's bone.

3. The artificial tibial component of claim 1 wherein: The internal structure of the proximal lattice (5) of the artificial tibia is a three-periodic minimal surface lattice structure, the porosity is 70%, the pore size is 2mm, the highly connected pores and smooth transition surface are suitable for cell adsorption and growth; The internal structure of the middle lattice (6) of the artificial tibia is a triangular and longitudinal area lattice filling, the lattice structure is a truss structure, the porosity is 60%, the pore size is 1mm, the triangular structure can bear a large load; The internal structure of the distal lattice (7) of the artificial tibia is a hexagonal lattice structure, the porosity is 70%, the pore size is 300-500um, the structure stability, shock absorption and energy absorption are good.

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