Method for preparing artificial femur specimen by using polymethyl methacrylate (PMMA)

Abstract

The invention is a method for preparing an artificial femur specimen by using polymethyl methacrylate (PMMA), which is characterized in that the method carries out continuous spiral CT scan on normal femur by taking along the cross section of the femur, and obtained multilayer images are manufactured into a three-dimensional reconstruction model of the femur; and then a femur model is manufactured, unbleached wax is utilized to manufacture a pulp cavity, and PMMA is poured into the model to be cured; finally, the unbleached wax is melted to obtain the hollow femur specimen. In the invention, PMMA is utilized to manufacture the femur model, the cost is low, the operation is simple, the performance is good, and the model can be easily stored, thus avoiding the worries about inadequate bone source and high cost. In addition, experiments which can not be carried out on the body of a patient can be carried out in vitro, such as the selection of different internal fixtures of identical typefracture and the analysis on stress applied on different type fractures of the same internal fixture, thus the method finds out solutions and provides helps for the selection of internal fixation of clinical femur fracture.

Description

Technical field

[0001] The invention relates to materials for medical experiments, in particular to a method for preparing artificial femur specimens by using polymethyl methacrylate.

Background technique

[0002] With the growth of the elderly population and the increase of traffic accidents, the incidence of femoral fractures has increased significantly. In order to enable patients to get out of bed early and improve postoperative function, especially for elderly patients, reduce complications caused by long-term bed rest and reduce mortality. If the patient's general condition permits, early surgical treatment and strong internal fixation have been widely recognized by clinical orthopedic surgeons. In the previous research work, everyone collected clinical data and made a summary and retrospective analysis.

[0003] In order to study the stress of femoral fractures more clearly, considering that each person's femur has individual differences, it is impossible to be c...

Examples

Embodiment 1

[0021] 1. Using 16-slice spiral CT to scan the normal femur continuously along the transverse section, a total of 384 layers of images were obtained, which were directly stored in accordance with the Dicom3.0 standard, and then the 3D reconstruction model of the complete femur was made using Mimics software;

[0022] 2. Use UG software to fractal the specimen to be processed, then sort and determine the tool path, and then use CNC milling to make a femur shape mold, and the same method to make a medullary cavity mold;

[0023] 3. Fill the raw wax in the cavity mold, and put an electric furnace wire in it in advance to make a model of the wax cavity, and then put it into the shape mold;

[0024] 4. At a room temperature of 25°C, pour PMMA into the shape mold, and PMMA is blended according to the ratio of self-setting dental tray powder: dental tray water at a ratio of 1:1.5;

[0025] 5. After the PMMA is cured, the electric furnace wire is energized to bake the raw wax inside a...

Technical field

[0001] The invention relates to materials for medical experiments, in particular to a method for preparing artificial femur specimens by using polymethyl methacrylate.

Background technique

[0002] With the growth of the elderly population and the increase of traffic accidents, the incidence of femoral fractures has increased significantly. In order to enable patients to get out of bed early and improve postoperative function, especially for elderly patients, reduce complications caused by long-term bed rest and reduce mortality. If the patient's general condition permits, early surgical treatment and strong internal fixation have been widely recognized by clinical orthopedic surgeons. In the previous research work, everyone collected clinical data and made a summary and retrospective analysis.

[0003] In order to study the stress of femoral fractures more clearly, considering that each person's femur has individual differences, it is impossible to be c...

Examples

Embodiment 1

[0021] 1. Using 16-slice spiral CT to scan the normal femur continuously along the transverse section, a total of 384 layers of images were obtained, which were directly stored in accordance with the Dicom3.0 standard, and then the 3D reconstruction model of the complete femur was made using Mimics software;

[0022] 2. Use UG software to fractal the specimen to be processed, then sort and determine the tool path, and then use CNC milling to make a femur shape mold, and the same method to make a medullary cavity mold;

[0023] 3. Fill the raw wax in the cavity mold, and put an electric furnace wire in it in advance to make a model of the wax cavity, and then put it into the shape mold;

[0024] 4. At a room temperature of 25°C, pour PMMA into the shape mold, and PMMA is blended according to the ratio of self-setting dental tray powder: dental tray water at a ratio of 1:1.5;

[0025] 5. After the PMMA is cured, the electric furnace wire is energized to bake the raw wax inside a...