阅读说明：本技术 基于形状记忆合金多孔微结构的髋关节假体 (Hip joint prosthesis based on shape memory alloy porous microstructure ) 是由 佟鑫 黄玉山 胡正正 杨俊杰 王小健 于 2021-07-01 设计创作，主要内容包括：本发明公开了基于形状记忆合金多孔微结构的髋关节假体,涉及髋关节假体的技术领域。该基于形状记忆合金多孔微结构的髋关节假体,包括有髋关节假体,所述髋关节假体内部开设有空腔,所述空腔内部旋转安装有第一连接体,所述第一连接体一端镶嵌有第二连接体,所述第二连接体一端镶嵌有球头假体,所述髋关节假体内包括髋关节假体芯体和髋关节假体壳体。本发明通过髋关节假体受到作用力后,使多孔微结构产生压缩形变,多孔微结构的变形膨胀,对髋关节骨进行一定大小的应力刺激,使髋关节骨与髋关节假体之间具有良好的生物材料相容性,避免了应力屏蔽效应引起的骨质疏松现象,可以大大降低种植体松动、脱落而失效的可能性。(The invention discloses a hip joint prosthesis based on a shape memory alloy porous microstructure, and relates to the technical field of hip joint prostheses. The hip joint prosthesis based on the shape memory alloy porous microstructure comprises a hip joint prosthesis, wherein a cavity is formed in the hip joint prosthesis, a first connecting body is rotatably arranged in the cavity, a second connecting body is embedded at one end of the first connecting body, a ball head prosthesis is embedded at one end of the second connecting body, and a hip joint prosthesis core body and a hip joint prosthesis shell body are arranged in the hip joint prosthesis. According to the invention, after the hip joint prosthesis is subjected to acting force, the porous microstructure is subjected to compression deformation and deformation expansion, and stress stimulation with a certain magnitude is carried out on the hip joint bone, so that the hip joint bone and the hip joint prosthesis have good biomaterial compatibility, the osteoporosis phenomenon caused by the stress shielding effect is avoided, and the possibility of implant loosening and falling to fail can be greatly reduced.)

1. The hip joint prosthesis based on the shape memory alloy porous microstructure comprises a hip joint prosthesis (1) and is characterized in that: the novel hip joint prosthesis is characterized in that a cavity (3) is formed in the hip joint prosthesis (1), a first connecting body (4) is rotatably mounted in the cavity (3), a second connecting body (5) is embedded into one end of the first connecting body (4), a ball head prosthesis (6) is embedded into one end of the second connecting body (5), a hip joint prosthesis core body (7) and a hip joint prosthesis shell body (8) are arranged in the hip joint prosthesis (1), and the surface of the hip joint prosthesis shell body (8) is provided with a porous microstructure (2).

2. The shape memory alloy porous microstructure-based hip joint prosthesis according to claim 1, characterized in that: the hip joint prosthesis core body (7) and the hip joint prosthesis shell body (8) are both made of nickel-titanium-containing shape memory alloy.

3. The shape memory alloy porous microstructure-based hip joint prosthesis according to claim 1, characterized in that: the composition units of the porous microstructure (2) are similar to the trabecular structure of human bone, are similar to cancellous bone, and have a negative Poisson ratio effect.

4. The shape memory alloy porous microstructure-based hip joint prosthesis according to claim 1, characterized in that: the porosity of the porous microstructure (2) is 60-80%, the rod diameter is 0.1-0.3 mm, and the pore diameter is 0.2-0.4 mm.

5. The shape memory alloy porous microstructure-based hip joint prosthesis according to claim 1, characterized in that: the thickness of the hip joint prosthesis shell (8) is 1mm-2 mm.

6. The shape memory alloy porous microstructure-based hip joint prosthesis according to claim 1, characterized in that: the porous microstructure (2) is integrally formed by a selective laser melting process.

7. The shape memory alloy porous microstructure-based hip joint prosthesis according to claim 1, characterized in that: the sizes of the hip joint prosthesis core body (7) and the hip joint prosthesis shell body (8) are obtained through the hip joint scanning size of a patient.

8. The shape memory alloy porous microstructure-based hip joint prosthesis according to claim 1, characterized in that: and a metal tantalum coating is coated on the surface of the ball head prosthesis (6).

9. The shape memory alloy porous microstructure-based hip joint prosthesis according to claim 1, characterized in that: the first connecting body (4), the second connecting body (5) and the ball head prosthesis (6) are connected in a laser spot welding mode.

10. The shape memory alloy porous microstructure-based hip joint prosthesis according to claim 1, characterized in that: the contact surface of the cavity (3) and the first connecting body (4) is provided with a thread-shaped structure.

Technical Field

The invention relates to the technical field of hip joint prostheses, in particular to a hip joint prosthesis based on a shape memory alloy porous microstructure.

Background

With the continuous development of additive manufacturing technology, more and more advanced technologies and materials are applied to medical devices. The total hip replacement can accurately reconstruct the proximal femur anatomical structure while keeping the original bone and physiological structure of the organism to the maximum extent, so that the stress distribution at the hip joint is more in line with the physiological requirement, the joint mobility after the operation is more close to the normal level, and the total hip replacement is a preferred method for treating the hip joint diseases in clinic. Because the material properties of the matrix metal and the bone of a human body are obviously different, the Stress of the bone around the endosseous implant (such as a hip joint prosthesis) is greatly different from that under a healthy state, and an obvious Stress Shielding (Stress Shielding) area exists, so that the problems of bone absorption and osteoporosis are caused after long-term use, and the implant is caused to have sterile loosening, fall-off failure and the like.

Disclosure of Invention

Technical problem to be solved

Aiming at the defects of the prior art, the invention provides a hip joint prosthesis based on a shape memory alloy porous microstructure, which solves the problem that the hip joint prosthesis in the prior art can not eliminate the stress shielding effect.

(II) technical scheme

In order to achieve the purpose, the invention is realized by the following technical scheme: the hip joint prosthesis based on the shape memory alloy porous microstructure comprises a hip joint prosthesis, wherein a cavity is formed in the hip joint prosthesis, a first connecting body is rotatably arranged in the cavity, a second connecting body is embedded at one end of the first connecting body, a ball head prosthesis is embedded at one end of the second connecting body, a hip joint prosthesis core body and a hip joint prosthesis shell are arranged in the hip joint prosthesis, and the porous microstructure is formed in the surface of the hip joint prosthesis shell.

Further, the hip joint prosthesis core and the hip joint prosthesis shell are both made of nickel-titanium-containing shape memory alloy.

Further, the composition units of the porous microstructure are similar to the trabecular structure of human bone and have a negative Poisson ratio effect similar to cancellous bone.

Furthermore, the porosity of the porous microstructure is 60-80%, the rod diameter is 0.1-0.3 mm, and the pore diameter is 0.2-0.4 mm.

Further, the thickness of the hip joint prosthesis shell is 1mm-2 mm.

Further, the porous microstructure is integrally formed by a selective laser melting process.

Further, the hip prosthesis core and hip prosthesis shell dimensions are obtained from a patient hip scan dimension.

Further, a metal tantalum coating is smeared on the surface of the ball head prosthesis.

Further, the first connecting body, the second connecting body and the ball head prosthesis are connected in a laser spot welding mode.

Furthermore, a thread-shaped structure is arranged on the contact surface of the cavity and the first connecting body.

(III) advantageous effects

The invention has the following beneficial effects:

(1) after the hip joint prosthesis based on the shape memory alloy porous microstructure is implanted into a human body, a patient can generate a tiny longitudinal displacement after the hip joint prosthesis is subjected to acting force in the daily activities and the like, so that the porous microstructure generates a certain amount of compression deformation, the porous microstructure deforms and expands, and then a certain amount of stress stimulation is performed on a hip joint bone, the hip joint bone and the hip joint prosthesis have good biomaterial compatibility, the osteoporosis phenomenon caused by the stress shielding effect is avoided, and the possibility that an implant is loosened and falls off to fail can be greatly reduced.

(2) The invention provides a hip joint prosthesis based on a shape memory alloy porous microstructure, the hip joint prosthesis core body and the hip joint prosthesis shell both made of nickel-titanium-containing shape memory alloy are beneficial to ensuring that the whole hip joint prosthesis has the shape memory function, shows super-elastic effect in austenite phase, has good damping performance and corrosion resistance, the thickness of the hip joint prosthesis shell is 1mm-2mm, so that the normal hip joint can be conveniently simulated, the weight of the whole hip joint prosthesis is reduced, the porous microstructure is integrally formed by a selective laser melting process, thereby ensuring the accuracy of the pore space, the rod diameter and the pore diameter of the porous microstructure, obtaining the sizes of the hip joint prosthesis core and the hip joint prosthesis shell through the hip joint scanning size of a patient, the hip joint prosthesis can be matched with a user more, and the situation that the size influences the use of the hip joint prosthesis is avoided.

Of course, it is not necessary for any product in which the invention is practiced to achieve all of the above-described advantages at the same time.

Drawings

FIG. 1 is a schematic view of the overall structure provided by the present invention;

FIG. 2 is a side view of the overall structure provided by the present invention;

FIG. 3 is a side view of the internal structure of the hip prosthesis according to the present invention;

FIG. 4 is a top view of the overall structure provided by the present invention;

fig. 5 is a schematic microstructure of the porous microstructure provided by the present invention.

In the figures, 1, a hip prosthesis; 2. a porous microstructure; 3. a cavity; 4. a first connecting body; 5. a second connector; 6. a ball prosthesis; 7. a hip prosthesis core; 8. a hip prosthesis shell.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it is to be understood that the terms "opening," "upper," "lower," "thickness," "top," "middle," "length," "inner," "peripheral," and the like are used in an orientation or positional relationship that is merely for convenience in describing and simplifying the description, and do not indicate or imply that the referenced component or element must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be considered as limiting the present invention.

Referring to fig. 1-2, an embodiment of the present invention provides a technical solution: the hip joint prosthesis based on the shape memory alloy porous microstructure comprises a hip joint prosthesis 1, a cavity 3 is formed in the hip joint prosthesis 1, a first connecting body 4 is rotatably installed in the cavity 3, a second connecting body 5 is embedded at one end of the first connecting body 4, a ball head prosthesis 6 is embedded at one end of the second connecting body 5, a hip joint prosthesis core body 7 and a hip joint prosthesis shell body 8 are arranged in the hip joint prosthesis 1, and a porous microstructure 2 is formed in the surface of the hip joint prosthesis shell body 8.

Specifically, the hip prosthesis core 7 and the hip prosthesis shell 8 are both made of nickel-titanium-containing shape memory alloy.

In this embodiment, the hip prosthesis core 7 and the hip prosthesis shell 8, both made of nickel-titanium-containing shape memory alloy, facilitate the shape memory function of the entire hip prosthesis 1, exhibit the superelastic effect in the austenite phase, and have good damping properties and corrosion resistance.

Specifically, the porous microstructure 2 has a composition unit similar to a human bone trabecular structure, and has a negative poisson's ratio effect similar to cancellous bone.

In the embodiment, the porous microstructure 2 is arranged, so that a small longitudinal displacement can be generated after the hip joint prosthesis is subjected to an acting force, the porous microstructure generates a certain-size compression deformation, the porous microstructure deforms and expands, and further a certain-size stress stimulation is performed on the hip joint bone, so that the hip joint bone and the hip joint prosthesis have good biomaterial compatibility.

Specifically, the porosity of the porous microstructure 2 is 60% -80%, the rod diameter is 0.1mm-0.3mm, and the pore diameter is 0.2mm-0.4 mm.

In the embodiment, the normal hip joint prosthesis is simulated by the porous microstructure 2 with the porosity of 60-80%, the rod diameter of 0.1-0.3 mm and the pore diameter of 0.2-0.4 mm, so that the osteoporosis phenomenon caused by the stress shielding effect is avoided, and the possibility of implant loosening and falling to lose efficacy can be greatly reduced.

In particular, the thickness of the hip prosthesis shell 8 is between 1mm and 2 mm.

In the embodiment, the thickness of the hip joint prosthesis shell 8 is 1mm-2mm, so that a normal hip joint can be conveniently simulated, and the weight of the whole hip joint prosthesis is reduced.

Specifically, the porous microstructure 2 is integrally formed by a selective laser melting process.

In the embodiment, the accuracy of the pore space, the rod diameter and the pore diameter of the porous microstructure 2 is ensured by the porous microstructure 2 integrally formed by the selective laser melting process.

In particular, the dimensions of the hip prosthesis core 7 and the hip prosthesis shell 8 are obtained from a scan of the dimensions of the patient's hip joint.

In the embodiment, the sizes of the hip joint prosthesis core body 7 and the hip joint prosthesis shell body 8 obtained by scanning the sizes of the hip joint of the patient can be more matched with the user, so that the condition that the sizes influence the use of the hip joint prosthesis is avoided.

Specifically, a metal tantalum coating is coated on the surface of the ball head prosthesis 6.

In the embodiment, the metal tantalum coating coated on the surface of the ball head prosthesis 6 is beneficial to improving the wear-resistant effect of the ball head prosthesis 6 and prolonging the service life of the whole hip joint prosthesis.

Specifically, the first connecting body 4, the second connecting body 5 and the ball head prosthesis 6 are connected by means of laser spot welding.

In the embodiment, the first connecting body 4, the second connecting body 5 and the ball head prosthesis 6 which are connected in a laser spot welding mode form a whole at the whole connecting part, so that the friction strength between the connecting part and the body of a patient is reduced, and the service life of the whole hip joint prosthesis is prolonged.

When the hip joint prosthesis based on the shape memory alloy porous microstructure is used, after the hip joint prosthesis is implanted into a human body, a patient can generate a tiny longitudinal displacement after the hip joint prosthesis is subjected to acting force in the daily activities and the like, so that the porous microstructure generates compression deformation with a certain size, the porous microstructure deforms and expands, and further the hip joint bone is subjected to stress stimulation with a certain size, so that the hip joint bone and the hip joint prosthesis have good biological material compatibility, the osteoporosis phenomenon caused by the stress shielding effect is avoided, and the possibility of implant loosening and falling to fail can be greatly reduced.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.

The preferred embodiments of the invention disclosed above are intended to be illustrative only. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention. The invention is limited only by the claims and their full scope and equivalents.