Feather quantized femoral stem

Abstract

A feather quantized femoral stem is integrally formed by a metal powder accumulation layer (additive manufacturing or 3D printing). A foundation pillar comprises at least one inner grid body located in the foundation pillar and a fusion layer surrounding the peripheries of the inner grid bodies; each inner grid body is of a hollow structure composed of a plurality of trabeculas, and therefore the inner grid bodies are provided with a plurality of holes stacked with one another; the fusion layer is provided with at least one area and formed by hollow outer grid bodies which are composed of a plurality of micro-trabeculas, the outer grid bodies are provided with a plurality of micro holes stacked with one another, and the density (kg/m<3>) of the inner grid bodies is unequal to that (kg/m<3>) of the outer grid bodies. According to the feather quantized femoral stem, the inner grid bodies and the outer grid bodies are each provided with multiple holes, therefore, the weight of the femoral stem is greatly lowered, and the physical load of a patient is lowered; in addition, the inner grid bodies and the outer grid bodies are arranged to be with different density, and therefore the capacity of bending resistance and shear resistance is improved.

Description

technical field [0001] The present invention relates to a feathered femoral stem, especially one that is integrally formed by metal powder lamination, and its base column is composed of hollow inner and outer grids with different densities, which can greatly reduce the In addition to the weight of the femoral stem, it can also increase the bending and shear strength. Background technique [0002] The human hip joint may be caused by many reasons such as congenital hip joint dysplasia, degeneration, disease, or external force, resulting in deformation of the femoral head and wear of the acetabulum, which makes the patient's legs sore and difficult to walk. Most of the current solutions are artificial hip replacement, so that patients do not need to bear the physical discomfort caused by hip joint disease. [0003] In the aforementioned artificial hip replacement, a longitudinal femoral stem is implanted in the patient's femur, and then an artificial femoral head and an aceta...

AI Technical Summary

Problems solved by technology

Most of the above-mentioned femoral stems are integrally formed by casting or traditional machining. Most of the materials are made of titanium alloy or other alloy steel. During the process, the new bone cells of the femoral body will adhere to the femoral stem, but because the surface of the femoral stem is smooth, it is not conducive to the attachment of new bone cells, so it is easy to loosen and shake. This phenomenon is more likely to occur in patients with osteoporosis. In order to prevent this phenomenon, some fixed pieces are added to lock, or artificial hip joints such as US Patent No. 8,529,569 are placed on the femoral stem. The surface of the femoral stem is roughened by mechanical processing. After the femoral stem is inserted into the cancellous bone tissue of the femoral body, the new bone cells can be tightly attached to the rough surface of the femoral stem to promote The ability of the femoral stem to

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