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Method for precisely customizing knee joint prosthesis

A knee joint prosthesis and knee joint technology, applied in the direction of knee joints, elbow joints, joint implants, etc., can solve problems such as limiting patient functions, achieve deformation relief, good stability, and meet production and clinical practical needs Effect

Inactive Publication Date: 2018-03-23
李威
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Although TKA is a very successful surgical treatment option for severe knee conditions such as osteoarthritis and rheumatoid arthritis, many studies have demonstrated that current TKA implants do not restore knee motion to a normal / healthy state, prosthetics The geometry and the selection of materials are two factors affecting the degree of contralateral cartilage wear, and the former is more important, which in turn limits the patient's function after surgery.

Method used

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  • Method for precisely customizing knee joint prosthesis
  • Method for precisely customizing knee joint prosthesis
  • Method for precisely customizing knee joint prosthesis

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Embodiment 1. Establishing a three-dimensional digital model of a knee joint prosthesis based on the medical image data of the patient's knee joint:

[0035] Such as figure 1 As shown, based on the DICOM-format CT / MRI tomographic scan image of the patient's knee joint tibia, the medical imaging software Mimics is used to perform image segmentation and repair according to the characteristics of different gray levels of soft tissue and bone in the image, and then perform three-dimensional reconstruction. A three-dimensional digital model of the tibia was obtained. Based on the CT / MRI tomographic scan image of the patient's knee femur in DICOM format, using the medical imaging software Mimics, the image is segmented and repaired according to the characteristics of different gray levels of soft tissues and bones in the image, and then 3D reconstruction is performed to obtain 3D digital model of femur.

Embodiment 2

[0036] Embodiment 2. Parametric modeling of tibial component of artificial knee joint

[0037]Establish the tibial mechanical axis, then find the tibial surgical epicondyle line on the vertical plane of the mechanical axis, take the tibial mechanical axis as the Z axis, and the surgical epicondyle line as the X axis, and establish a three-dimensional coordinate system according to the rule of the right-hand Cartesian coordinate system ;Use the distance measurement tool to determine the articular surface of the inner and outer compartments of the tibia, and fit the values ​​of the morphological parameters of the distal end of the tibia on the corresponding articular surfaces, wherein the fitting curve of the coronal plane of the inner compartment of the tibial spacer includes 101- tibial spacer Medial compartment straight line 1, 102 tibial medial compartment arc 1, outer compartment coronal surface fitting curve includes 103- tibial lateral compartment straight line 2, 104- tib...

Embodiment 3

[0039] Embodiment 3, reverse design obtains the CAD model of personalized tibial prosthesis:

[0040] Further, on the basis of the above parameters, perform sketching, stretching, cutting, chamfering and other operations, and finally add a fixed structure, including adding a fixed cylinder and a rear-end connecting cylinder, and finally obtain a personalized anatomical structure. Parametric knee prosthesis.

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Abstract

The invention relates to the field of medical instruments, in particular to a method for precisely customizing a knee joint prosthesis. The method for precisely customizing the knee joint prosthesis specifically comprises the steps of data entry, software processing, construction of a three-dimensional model of a knee joint prosthesis assembly, personalized feature parameter measurement, parametric modeling, simulation replacement and verification. The knee prosthesis comprises a femoral component and / or a tibial component. According to the method, a simple data image is used for acquiring personalized feature parameters of the knee joint prosthesis of the human body, and the method is simple, easy to use and capable of meeting production and clinical practical requirements at the same time.

Description

technical field [0001] The invention relates to the field of medical devices, in particular to a method for precisely customizing a knee joint prosthesis. Background technique [0002] Artificial total knee replacement is a kind of artificial joint replacement surgery. It refers to the removal of the articular surface of the human body that cannot be repaired by itself, and the replacement of damaged joints with artificial joint parts, so as to correct the line of limbs, eliminate knee joint pain, and maintain joint stability. It is a treatment method to restore the function of the knee joint. [0003] Artificial knee replacement has a history of more than 20 years. In recent years, knee replacement has developed rapidly and solved some difficult technical problems in the past. Osteoarthritis of the knee joint and rheumatoid arthritis are the most common arthritis of the knee joint. In the late stage of arthritis, severe joint deformity and mobility impairment occur, and to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61F2/38
CPCA61F2/3836A61F2/3859A61F2/389
Inventor 李威
Owner 李威
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