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A femoral stem prosthesis

A femoral stem and stem body technology, applied in the femoral shaft, femoral head, hip joint, etc., can solve the problems of limited load on the proximal lateral femur and limited improvement effect, so as to improve the problem of aseptic loosening, avoid bone resorption, The effect of improving mid- and long-term stability

Active Publication Date: 2021-11-05
BEIHANG UNIV
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  • Description
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AI Technical Summary

Problems solved by technology

[0006] Although the study found that the above design can reduce the stress shielding of the proximal medial femur to a certain extent, since the femoral stem and the femur are not connected as a whole, when the femoral stem contracts inwardly under the action of bending load in the body, the stress transmitted to the proximal lateral femur limited load
Therefore, the above design has a limited effect on improving the stress shielding of the proximal lateral femur.

Method used

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  • A femoral stem prosthesis
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Embodiment Construction

[0032] In order to make the technical problems, technical solutions and advantages to be solved by the present invention clearer, the following will describe in detail with reference to the drawings and specific embodiments.

[0033] The invention provides a femoral stem prosthesis, such as Figure 1-6 As shown, a handle body 1 is included, a notch 10 is provided on the outside of the handle body 1 , and an auxetic structure 2 is provided in the notch 10 .

[0034] It should be noted that the position reference here is based on the human body after the femoral stem prosthesis is implanted into the human body, and the inner side refers to the side where the femoral neck 11 and the ball joint 12 on the handle body 1 Figure 1-2 The right side in the shown embodiment), the outside refers to the side of the handle body 1 away from the femoral neck 11 and the ball joint 12 (ie Figure 1-2 left in the example shown).

[0035] Auxetic structural materials belong to the category of ...

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Abstract

The invention discloses a femoral stem prosthesis, which belongs to the technical field of orthopedic implants. The femoral stem prosthesis includes a handle body, a gap is arranged on the outside of the handle body, and an auxetic structure is arranged inside the gap. The invention can better reduce the stress shielding on the inner and outer sides of the proximal femur, avoid bone resorption in the proximal femur, and improve the problem of aseptic loosening of the femoral stem caused by stress shielding after total hip replacement. In addition, the auxetic structure itself is also a porous structure, and its interconnected pores are conducive to the transportation of nutrients and metabolites, which can promote bone ingrowth and further improve the medium- and long-term stability of the prosthesis.

Description

technical field [0001] The invention relates to the technical field of orthopedic implants, in particular to a femoral stem prosthesis. Background technique [0002] Total hip arthroplasty is an effective means of treating severe hip joint diseases. It replaces diseased or deformed hip joints by implanting artificial femoral stems and artificial acetabular cups, so as to reduce pain, restore function and correct deformity. In 2015 alone, the annual replacement volume of artificial hip joints in China reached 400,000 units, and this number is still growing at a rate of 25%-30% per year. The demand for high-performance hip prostheses is increasing clinically due to the increase in patient life expectancy and the need for complex load-bearing conditions and range of motion. [0003] The most common failure mode of hip prosthesis is aseptic loosening of the femoral stem, and stress shielding is the main mechanical factor for aseptic loosening. After the femoral stem is implant...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A61F2/36
CPCA61F2/3662A61F2/3672
Inventor 刘博伦郑诚功
Owner BEIHANG UNIV
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