Realisierung eines 3D

  • Diese Masterarbeit entstand im Rahmen des Projektes
  • This master thesis was developed within the framework of the project "Intramedullary Osteo-synthesis - IntraOs" and is only one part in this project to reach the project goal. The aim of this master thesis was the development of a 3D - print model of the fibula. For this, CT data were available from a female geriatric patient who had ankle fractures on the left and right side. From these CT data, the fibula with a software was laboriously and very time - consuming work segmented out. After several trial prints and interim correction and adjustment of the segmented data as well as changing of printing parameters, we came to a first usable print result. These models have now been prepared. First, a saw jig had to be designed to simulate a Weber B fracture in always the same position. After fracturing the models, these pairs were treated with standard plate osteosynthesis, angle stable plate osteosynthesis and the newly developed fibula screws. The operations were led by Dr. Karich at the HBK. To clamp the models into the testing machine an adapter had to be constructed. The manufacture of the adapters I took over in the domestic workshop. After all preparatory work had been completed and the previous models had already been tested at the Fraunhofer IWU, the actual tests with the final models could now take place. On the one hand, the artificial bones should be examined for torsional loading and, on the oth-er hand, for pressure loading. This took a few hours, with the setup of the models in the testing machine being the most ex-pensive part of the trials. The results obtained are not very meaningful. On the one hand, we came to the realization that the printed bones without a fibula screw can withstand 960 N of compressive load; in the prepared models, we tested only up to 500 N and only for 20 engine cycles. However, there was already a tendency that the models treated with fibula screw performed better, especially in the compression test, like the models with plate osteosynthesis. For all further tests and to be able to make reliable statements about the durability of the implants and the 3D models, the models have to be tested until failure and that for a considerably longer time.

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Author:Crispin Falk
Title Additional (English):Realization of a 3D - printing model for biomechanical in vitro tests with development of corresponding test methodsInvestigation of two osteosynthesis methods
Advisor:Thomas HorstGND, Bernhard KarichGND
Document Type:Master's Thesis
Language:German
Name:Heinrich- Braun- Klinikum Zwickau
Karl-Keil-Straße 35, 08060 Zwickau
Year of first Publication:2019
Publishing Institution:Westsächsische Hochschule Zwickau
Tag:3D-Druck; Fibula; Fibulaimplantat; Geriatrie; Kunstknochen
Page Number:63 Seiten, 70 Abb., 6 Tab., 23 Lit.
Faculty:Westsächsische Hochschule Zwickau / Automobil- und Maschinenbau
Release Date:2019/09/16