Design method of a customized artificial knee prosthesis

An artificial knee joint and design method technology, applied in the field of medical equipment, can solve the problems of discontinuous curvature of the femoral sagittal condyle curve, low adaptability, weak rollback ability, etc., improve the mechanical condition, and avoid left and right swaying. , the effect of enhancing the rollback capability

Inactive Publication Date: 2018-08-21
TAIYUAN UNIV OF TECH
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AI Technical Summary

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 the femoral sagittal condyle curve, weak rollback ability, poor stability and poor adaptability existing in the current knee prosthesis. design method

Method used

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

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Embodiment Construction

[0032] A design method for a customized artificial knee prosthesis, comprising the following steps: (1) Measure the sagittal plane dimensions of the two condyles of the femoral end of the patient through CT images of the patient's femoral end, and then respectively fit the femur The fitting ellipse of the first sagittal plane of the two condyles; (2) Measure the coronal dimensions of the two condyles at the level of the patient’s femoral end through the CT image of the femoral end to obtain the fitting ellipse of the coronal plane of the two femoral condyles, and complete the distance between the two condyles at the same time Measurement; (3), according to the size of the semi-minor axis of the coronal plane fitting ellipse of the femoral two condyles, the first sagittal plane fitting ellipse corresponding to each coronal plane fitting ellipse is reduced by L, and the first sagittal plane fitting ellipse of the femoral two condyles is obtained. Two sagittal plane fitting ellips...

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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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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