Design method of customized artificial knee joint prosthesis

A technology of artificial knee joint and design method, which is applied in the field of medical equipment, can solve the problems of discontinuous curvature of the sagittal condyle curve, low adaptability, and weak rollback ability, so as to improve the mechanical condition and avoid left and right swaying , Enhance the effect of rollback ability

Inactive Publication Date: 2017-06-13
TAIYUAN UNIV OF TECH
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Problems solved by technology

[0003] The present invention provides a customized artificial knee prosthesis in order to solve the technical problems of discontinuous curvature of t

Method used

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  • Design method of customized artificial knee joint prosthesis
  • Design method of customized artificial knee joint prosthesis
  • Design method of customized artificial knee joint prosthesis

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[0032] A method for designing a customized artificial knee joint prosthesis, comprising the following steps: (1) measuring the sagittal plane dimensions of the two condyles of the patient's femoral end through a CT image of the patient's femoral end, and then fitting the femur respectively according to the above-mentioned size data The first sagittal plane of the two condyles fits the ellipse; (2) Measure the coronal dimension of the two condyles on the horizontal plane of the patient's femoral end through the CT image of the patient's femoral end to obtain the coronal fitting ellipse of the two femoral condyles. Measure; (3) According to the size of the semi-minor axis of the fitting ellipse in the coronal plane of the two femoral condyles, reduce the first sagittal plane fitting ellipse corresponding to each coronal plane fitting ellipse by L to obtain the second femoral condyle. The bisagittal plane fits an ellipse, where L is equal to the length of the short semi-axis of th...

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Abstract

The invention relates to the field of a medical treatment device, and is used for the design of an operation replacement piece of an artificial knee; the invention particularly discloses a design method of customized artificial knee joint prosthesis. The design method solves the technical problems of discontinuous curve curvature of thighbone vertical plane condyle, weak rolling ability and poor stability in the knee joint prosthesis at present. A design method of customized artificial knee joint prosthesis, wherein the design method includes steps of (1), fitting first vertical plane fitting ellipses of two condyles of the thighbone through a CT image of the thighbone tail end of a patient; (2), acquiring coronal plane fitting ellipses of two condyles of the thighbone through the CT image of the thighbone tail end of the patient; (3), according to the dimension of minor semi-axes of the coronal plane fitting ellipses of two condyles of the thighbone, acquiring second vertical plane fitting ellipses of two condyles of the thighbone, wherein L is equal to the length of minor semi-axes of the coronal plane fitting ellipses; (4), scanning the coronal plane fitting ellipses of two condyles of the thighbone along the corresponding second vertical plane fitting ellipses and forming a smooth curve face of the femoral condyle, and further forming a two-condyle structure at the tail end of the thighbone.

Description

technical field [0001] The invention relates to the field of medical equipment, and is used for the design of artificial knee joint surgical replacement parts, in particular to the design of a customized artificial knee joint prosthesis. Background technique [0002] The existing artificial knee prosthesis products (see the literature Knee implants – Review of models and biomechanics, Materials and Design 30 (2009) 398–413, Fig. 3), all use multiple circles tangent to form a curve group to fit the femoral sagittal Shaped condyle curve; use circular curves to fit the condyle surfaces on both sides of the femoral coronal plane. Due to the limitations of processing technology over the years, the knee prosthesis formed today has the characteristics of easy processing and manufacturing, less modification variables, and easy modification. However, with the advancement of manufacturing technology (3D printing and multi-axis linkage machine tools), people's living standards have im...

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Application Information

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IPC IPC(8): A61F2/38A61B6/03A61B6/00
CPCA61B6/032A61B6/50A61B6/5217A61F2/38
Inventor 李新宇陈维毅
Owner TAIYUAN UNIV OF TECH
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