Variable modulus personalized femoral stem prosthesis and manufacturing method thereof

Abstract

The invention discloses a variable modulus personalized femoral stem prosthesis and a manufacturing method thereof. The personalized femoral stem prosthesis satisfies the requirements of a personalized femoral medullary cavity, and according to the force analysis of the prosthesis, topological optimization is conducted on an individualized shape main body structure of the prosthesis to obtain a spatial main body structure, the spatial main body structure is enveloped by a porous structure of which grades are freely communicated, and a shape is matched with the shape of the femoral medullary cavity. The porous structure of which the grades are freely communicated is designed according to various constraints such as a contact surface of a femoral stem, the force of the femoral stem, elasticmodulus matching and the like, spatially variable modulus is achieved, the personalized femoral stem prosthesis is prepared through laser selective melting, after cleaning and disinfection, inducing bone growth degradable hydroxy composite materials are filled, and the prosthesis is packaged and disinfected for preparation use.

Description

technical field [0001] The invention belongs to the field of metal 3D printing personalized acetabular femoral stem prosthesis, and in particular relates to a variable modulus personalized femoral stem prosthesis and a manufacturing method. Background technique [0002] At present, the metal implant prosthesis is relatively heavy in weight, has a much higher elastic modulus than the bone itself, and is relatively difficult to integrate with the bone, and is prone to fretting. Biological porous prosthesis has been used in the body, but its form is relatively simple, and some requirements cannot meet the requirements of practical application. [0003] The elastic modulus of cancellous bone in the human body is 1.3GPa, and the elastic modulus of compact bone is 18GPa. Most of the materials used in the femoral stem prosthesis are titanium and its alloys, etc., and their elastic modulus is roughly in the range of 100GPa to 200GPa. It is far greater than the elastic modulus of th...

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Problems solved by technology

[0002] At present, the metal implant prosthesis is relatively heavy in weight, has a much higher elastic modulus than the bone itself, and is relatively difficult to integrate with the bone, and is prone to fretting. Biological porous prosthesis has been used in the human body, but its form is relatively simple, and some requirements cannot meet the requirements of practical applications.

[0003] The elastic modulus of cancellous bone in the human body is 1.3GPa, and the elastic modulus of compact bone is 18GPa. Most of the materials used in the femoral stem prosthesis are titanium and its alloys, etc., and their elastic modulus is roughly in the range of 100GPa to 200GPa. It is far greater than the elastic modulus of the human bone. If the elastic modulus is too high, the mechanical properties of the femoral stem prosthesis cannot match the bone, which will lead to the loosening of the femoral stem prosthesis.

After the femoral stem is implanted in the human body for a period of time, the proximal end of the femoral stem prosthesis with too high elastic modulus will produce a stress shielding effect. According to Wolf's bone reconstruction law, the femur will redistribute stress according to the stress environment, and the redistribution of stress will lead to The reduction of mineral density in the bone makes the proximal end of the femoral body lack of effective support and causes the loosening of the femoral stem prosthesis, which ultimately affects the service life of the femoral stem prosthesis

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