Customized bone-like trabecular structure knee joint prosthesis and manufacturing method

Abstract

The invention discloses a customized bone-like trabecular structure knee joint prosthesis, including a tibia holder and a tibia pad. A tibia medullary space is formed between the tibia holder and thetibia pad. The tibia medullary space is provided with a bone trabecular grid structure. Appearance of an upper end and a lower end of the knee joint prosthesis meets a human body anatomical structureand fits the medullary space. A PEEK material is used to reduce product weight, stress shielding is reduced, and conditions of bone resorption and prosthesis loosening are prevented. The tibia pad component is provided with an induction device, and an adjusting mechanism and a control structure are arranged in the tibia holder. An objective of installing the induction device is that through adjusting pressure between a femoral condyle and the tibia pad by the device, pressure of a gasket, applied by a femoral condyle prosthesis part, is better balanced, so that the inner side and the outer side of bones on a distal femur and a tibia near-end have uniform pressure. Bone loss and prosthesis failure caused by life styles and other factors are eliminated, and the knee joint prosthesis improvesmedium and long term life of a patient prosthesis.

Description

technical field [0001] The invention relates to the technical field of artificial knee joint replacement equipment, in particular to a personalized bone-like trabecular structure knee joint prosthesis. Background technique [0002] Osteoarthritis is a chronic inflammation with articular cartilage degeneration as the core, involving bone and including synovium, joint capsule and other joint structures. Diseases of the joints. With the increase of the average life expectancy and the aggravation of the aging population, the incidence of various bone and joint diseases, especially degenerative diseases, is increasing, and the most effective and successful method for the treatment of end-stage or severe knee joint diseases is artificial For knee arthroplasty, the current 10--15-year survival rate of TKA prosthesis is 85%-90%, which will significantly improve the patient's motor function and quality of life. [0003] In the knee replacement prosthesis, there is a rigid direct co...

AI Technical Summary

Problems solved by technology

[0003] In the knee replacement prosthesis, there is a rigid direct contact between the tibial component and the femoral component, that is, there is a rigid contact between the metal femoral condyle and the tibial plateau component and the polyethylene spacer, and the elasticity is achieved only by the weak deformation of the polyethylene material Function, the wear between the femoral condyle and the spacer is serious, which reduces the life of the spacer, and the weak deformation of the spacer cannot realize the function of the natural meniscus, which brings inconvenience to the patient after implanting it into the human body

[0004] The defect of the knee joint prosthesis in the prior art is that after the elastic component is added, the elastic fixed knee joint is realized, that is, the rotation cannot be realized, so that there is a high contact stress between the femoral condyle and the spacer, Edge loading occurs, creating stress concentrations that cause wear on the polyethylene

[0005] At the same time, the cooperation between the tibial tray and the tibial pad in most knee prostheses is fixed by screws or a hook structure, which destroys the overall structure of the tibial pad and affects the service life of the product.

The hook structure is adopted, although the overall structure of the tibial pad is retained, but in order to increase the strength of the hook, the thickness of the tibial tray platform and the tibial pad are increased, which increases the weight of the product, resulting in an increase in production costs and at the same time the patient's burden

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