Researches on the design of customized femoral implant

Innovations in the industry have also proved to be quite impressive in the medical field, where another approach is needed due to the need for personalization. Due to femoral fractures, it is not just enough to stabilize the bone, but also to have the integration of the implant with the host bone. Thisresearch is intended to undertake studies on the redesign of the distal femoral plate. The redesign had been elaborated to increase the number of people who are compatible with this type of femoral plate and also, to improve the physico-mechanical and biological properties toward to a commercial distal femoral plate made of type 316L stainless steel. Within SolidWorks software, a static simulation has been run after there have been defined restraints, external loads, and a mesh. The parameters were similar to those after the implantation. Taking this reason into consideration, the final results will be improved by modifying plate’s material from 316L to titanium alloy Ti6Al7Nb to increase the capability and biocompatibility. Moreover, the geometry of the distal femoral plate changes to decrease theweight and time of osteosynthesis. The final implant is parametrized 3D models that handle all day-to-day activities and has a weight 50% lower than that of the commercial implant

Generation of Computational 3D Models of Human Bones Based on STL Data and CAD Software Packages

This paper presents three methods of converting complex 3D models of STL type into solid models. For converting the STL models, specific approximation functions from CATIA and Creo Parametric software were used as well as 3D solid modeling methods that used sketches drawn for sections of the specific analyzed model. This conversion is required to get a solid 3D model that can be used for finite element analysis and to be processed using Boolean functions in specific CAD programs. This paper also presents a study of the effectiveness of FEA in respect to the time required for the analysis of each converted model. The analyzed STL files contain data obtained by computer tomography and are the 3D models of the human orthopedic system: the left zygomatic bone and upper part of the right femur. The presented conversion methods can be used by design engineers both in medical applications (where the complexity of forms is well known) for the design of implants and for industrial applications for reverse engineering

Designing a testing device for customized hip prosthesis

The practical reference of this article is part of the technical and medical field of designing, modeling and testing of hip prostheses. The purpose of the article is to present a stand that tests the hip orthopedic prostheses. After the initial design, the whole assembly was redesigned both dimensionally and functionally based on the results obtained by the finite element method. The main results fromthe design of the stand are both the wide range of types of hip prostheses that can be tested as well as the actual simulation of the kinematics of the joint. The simulations performed correspond to the different daily actions: walking, running and other special conditions. The practical implications of this research are the possibility of testing the time endurance of prosthesis in the laboratory condition. The results obtained from this research can be applied to the development of new generations of prostheses, starting from materials with better endurance and reaching aspects of shape and customizableoptimal dimensions

Characterization polyethylene terephthalate nanocomposites mixing with nano-silica and titanium oxide

Polyethylene terephthalate (PET) based nanocomposites containing nano-silica (Aerosil (Degusa)) and titanium oxide (TiO2 (Merk)) were prepared by melt compounding. Influence of nano-silica and titanium oxide on properties of the resulting nanocomposites was investigated by scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR) and atomic force microscopy (AFM). The possible interaction between nano-silica and titanium oxide particles with PET functional groups at bulk and surface was elucidated by transmission of FTIR-ATR spectroscopy. AFM studies of the resulting nanocomposites showed an increased surface roughness compared to pure PET. SEM images illustrated that nano-silica particles have tendency to migrate to the surface of the PET matrix much more than titanium oxide powder

Characterization polyethylene terephthalate nanocomposites mixing with nano-silica and titanium oxide

Polyethylene terephthalate (PET) based nanocomposites containing nano-silica (Aerosil (Degusa)) and titanium oxide (TiO2 (Merk)) were prepared by melt compounding. Influence of nano-silica and titanium oxide on properties of the resulting nanocomposites was investigated by scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR) and atomic force microscopy (AFM). The possible interaction between nano-silica and titanium oxide particles with PET functional groups at bulk and surface was elucidated by transmission of FTIR-ATR spectroscopy. AFM studies of the resulting nanocomposites showed an increased surface roughness compared to pure PET. SEM images illustrated that nano-silica particles have tendency to migrate to the surface of the PET matrix much more than titanium oxide powder

Adhesion between Biocomposites and Different Metallic Structures Additive Manufactured

This study was concerned with the adhesion of resin cement to metal surfaces obtained by selective laser melting process (SLM), and how it could be improved the bond strength at the biocomposite-metal junction. The SLM substrates were manufactured out of pure titanium (Ti), Ti6Al7Nb, and CoCr alloys. The metallic surfaces were covered with 5 types of biocomposites: 2 commercially resin-modified glass-ionomer cements (GC Fuji Plus and KETAC CEM) and 3 types of in-house developed materials. These biocomposites were mechanical characterized under compression and bending trials. The biocomposites-metal adhesion was settled both on as built metallic surfaces and after they were sandblasted with alumina. All the sandblasted SLM surfaces presented higher adhesion strength in comparison with the untreated specimens. The CoCr specimens show the highest bonding value. Additionally, the morphological aspects of joining interfaces were investigated using a scanning electron microscope (SEM). The mechanical properties and metal adhesion of these biocomposites were influenced by the liquid powder ratio. It is essential to apply a surface treatment on SLM substrate to achieve a stronger bond. Also, the chemical composition of biocomposite is a major factor which may improve the adhesion of it on different metallic substrates