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Feather quantized femoral stem

A femoral stem and stem head technology, applied in the field of feathered femoral stems, can solve problems such as loosening, shaking, increasing the load on human bones, and unfavorable attachment of new bone cells, and achieves improved bending and shear resistance. The effect of the fusion effect

Inactive Publication Date: 2015-10-14
PAONAN BIOTECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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 attach to the femoral body so that the femoral stem can be fastened in the femoral body
However, this kind of rough surface formed by machining or sintering can only be formed on the outermost surface of the femoral stem, so that new bone cells can only attach to the surface of the rough surface, and cannot penetrate deep into the femur Therefore, the femoral stem and the femoral body of the human body disclosed in this prior document are not really fused together, but only "attached" together, so the purpose of fusion cannot really be achieved, and the improved necessary
[0004] In addition, the existing femoral stem is a solid metal block formed by casting or traditional mechanical processing, and its weight is very heavy. After being implanted in the human femur body, the load on the human bone will be increased, resulting in The disadvantages of the uneven application of force on the legs when the human body is in motion

Method used

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Embodiment Construction

[0035] see figure 1 , figure 2 , Figure 5 ,and Image 6 As shown, the present invention relates to a feathered femoral stem 10, which is integrally formed by metal powder lamination (additive manufacturing or 3D printing), and includes a base column 11, and a handle head is formed on the top of the base column 11 12, and an artificial femoral neck 121 is protruded on the handle 12; wherein the base column 11 includes: at least one inner grid body 111, located in the inner part of the base column 11, and each inner grid body 111 is A hollow-out structure composed of several trabeculae, with several holes 111' stacked on each other; and a fusion layer 112, which surrounds the periphery of the inner mesh body 111, and the fusion layer 112 has at least one area, which is composed of Several micro-beams are composed of a hollow-out outer grid body 112a, and the outer grid body has several micro-holes 112' stacked on each other (such as Figure 5 shown), and let the density of...

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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...

Claims

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Application Information

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IPC IPC(8): A61F2/32
Inventor 叶中权
Owner PAONAN BIOTECH
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