Personalized femoral stem prosthesis easy to remove and renovate and manufacturing method thereof

Abstract

The invention discloses a personalized femoral stem prosthesis easy to remove and renovate and a manufacturing method thereof. The prosthesis consists of a personalized NiTi alloy porous biological femoral stem casing and a personalized femoral stem body. In order to solve the problem that traditional bone fixed with cement is not easy to renovate, the prosthesis utilizes a biological porous femoral stem casing and is characterized in that the stem casing is matched with a medullary cavity structure, but is slightly smaller than the medullary cavity structure. The stem casing is formed by using NiTi alloy with memory effect through 3D printing method and subjected to a later memory training; the stem casing is a naturally expanded porous structure in the form; and according to the stress analysis, the porosities in the outer side and the inside of the femur is different to a certain extent; the phase-change temperature point of the memory effect of the stem casing is 10-20 DEG C lowerthan the body temperature. The stem casing is in a contracted state when the temperature is lower than the phase-change temperature point, and the stem casing is in an expanded state when the temperature is higher than the phase-change temperature point; the prosthesis has the advantages of simple structure design, high compatibility with the bone marrow cavity structure, good biocompatibility andthe like, and can prevent the femoral stem prosthesis from sinking, loosening or twisting and the like.

Description

technical field [0001] The invention belongs to the technical field of artificial joints in the field of medical bone replacement, and relates to a personalized femoral stem prosthesis that is easy to remove and repair and a manufacturing method. Background technique [0002] The so-called 4D printing technology is to add the "time" element to the concept of traditional 3D printing, and the printed object can self-adjust in shape over time. This technology does not even need a printing machine, it can directly make the material rapid prototyping, which can be called a revolutionary technology. 4D printing technology will be applied to furniture, bicycles, cars and even medical fields. [0003] Due to its shape memory effect and superelastic behavior, NiTi alloy has been widely used in biomedicine, aerospace, and intelligent robots. Laser selective melting 3D printing NiTi alloy hip femoral stem prosthesis with memory effect forms a new method of 4D printing hip prosthesis....

AI Technical Summary

Problems solved by technology

[0005] When the femoral stem prosthesis is implanted into the human body, it is difficult to match the femoral stem prosthesis with the femoral osteotomy surface. The femoral stem prosthesis that fully matches the bone marrow cavity will partially interfere with the bone marrow cavity, making it difficult to insert

In addition, when the load-bearing of the femur is unbalanced and the shear and torsional stress generated by the interface exceed the tolerance range, when the two sides of the interface are caused to move slightly, the femoral stem prosthesis is prone to loosening, torsion and subsidence, etc.

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