Meniscus implant with negative Poisson's ratio effect

Abstract

The invention discloses a meniscus implant with a negative Poisson's ratio effect and aims to overcome defects of existing meniscus structure design. The meniscus implant has outstanding features as follows: a negative Poisson's ratio porous structure is introduced into meniscus design, and by the aid of folded and concave porous topological structure characteristics of the meniscus design as wellas excellent mechanical properties of lower deformation rigidity and higher yield strength under the impact load action, biocompatibility of the meniscus is increased, the biomechanical function of the meniscus is restored, and finally, the purpose of repairing and reconstructing the meniscus is achieved. Controllable design of porosity, pore diameter, strength, Poisson's ratio and shock resistance can be realized in a meniscus design process, the topological structure and the biomechanical function of the meniscus are better matched with the physiological environment under the external loadaction while mass transport is guaranteed, and the structure and the function of the meniscus can be reconstructed. The designed meniscus can be obtained by 3D-printing laminated object manufacturing,can select degradable or non-degradable biological materials according to different clinical demands, and has broad application prospects.

Description

technical field [0001] The invention is applied in the field of orthopedic medical devices, and in particular relates to a meniscus implant with negative Poisson's ratio effect. Background technique [0002] The meniscus is an important part of the knee joint. It is located between the femur and the tibia. The wedge-shaped filling of the meniscus expands the contact area between the tibia and femur, which can stabilize the joint and conduct loads during daily knee joint movements. In addition, the hardness of the meniscus is only half of that of the articular cartilage, and it has good ductility, so that it can absorb energy efficiently through its own deformation during walking, descending stairs, especially during strenuous exercise, and buffer the impact between the tibial and femoral articular surfaces. Protects the knee well. Meniscus injury is a common and frequently-occurring disease in knee joint sports injuries. And after its injury, the self-repair ability of th...

AI Technical Summary

Problems solved by technology

Analyzing the research progress of meniscus implants, it is found that the biocompatibility of meniscus such as cell adhesion, proliferation, differentiation, nutrient transport, metabolite discharge and initial strength are the focus of researchers, while its biomechanical functions such as high toughness However, the reconstruction of high impact resistance has not been paid attention to, which has led to the fact that the existing meniscus implants can achieve meniscus reconstruction very well in the early stage, but their mechanical properties and physiological and mechanical environment are not well improved over time. Matching, it will cause a series of joint diseases such as cartilage degeneration

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