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Search Results: 1 - 10 of 10591 matches for " Prosthesis design and manufacture "
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Computer-aided reconstruction of hip joint in revision arthroplasty
K. Skalski,K. Kwiatkowski,J. Domanski,T. Sowinski
Journal of Orthopaedics and Traumatology , 2006, DOI: 10.1007/s10195-006-0124-y
Abstract: Geometric revision reconstruction of the hip joint of a female patient is presented. Because of extensive bone resorption and strong bone obstruction, we decided to employ a custom–made prosthesis not only in the pelvis but also in the femur. The custom prosthesis design and manufacturing processes were carried out with the aid of computed tomography (CT), a system of tomographic image processing, a computer–aided design (CAD) system and a computer–aided manufacturing (CAM) system. The process included tomographic measurements of the patient’s hip joint, conversion of the CT images, geometrical modelling of the femur and pelvis in the CAD system, prostheses design, virtual simulation of the reconstructed acetabulum, determination of prosthesis matching, and manufacturing on a CNC machine. The outcome of this engineering process was a total hip arthroplasty (THA) surgical operation.
Preparation Process and Optimization Design for Composites Rudderpost in the Long-Time High Temperature Environment  [PDF]
Li Jing, Changwan Min, Geliang Sun, Bin Fu, Min Chen, Zhanwei Cao
Journal of Materials Science and Chemical Engineering (MSCE) , 2017, DOI: 10.4236/msce.2017.51010
Abstract:
Rudder is an important part for the glider aircraft. In order to satisfy the long-time high-velocity for the near-space vehicle in the atmosphere, the light- weight, high-stiffness and high-strength all-composites rudderpost is required urgently to be prepared. The all-composites rudderpost can keep high rudder efficiency in the high temperature environment. Based on the technique require-ment of high-performance composites rudder, a 3D C/SiC rudderpost was manufactured by the CVI-CMC-SiC [1] processes. It was found during rudderpost testing that the high-temperature mechanical properties decreased and had large discretization. The analysis of the failure mechanisms was conducted by FTA method to recognize the failure modes and main reasons for rudderpost abnormal fracture and to reproduce the fracture phenomenon, which could guide production company to modify their preparation process control. Then the modified processes were proved to be validated. And the stability and reliability of the production performances were improved.
Improving the Use of Robotic Welding of Aluminum Boats through Modularization  [PDF]
Paul Kah, Esa Hiltunen, Jukka Martikainen
Engineering (ENG) , 2014, DOI: 10.4236/eng.2014.61007
Abstract:

The level of automation in the manufacture of recreational aluminum boats is very low. Robotized welding is rarely utilized, although it is commonly considered as the most effective way to reduce costs and increase competitiveness. A reason for the under-exploitation of robotics can be found in the construction of aluminum boats; boat models and their detailed structures are almost without exception individual pieces. A new stiffener structure for an aluminum recreational boat hull is developed in this work. Construction of the stiffener as a module allows exploitation of the advantages of modularization. The number of different parts is reduced and the structure simplified improves the applicability of robotic welding and provides benefits accruing from mass production. The same module can be used in several boat models. The modularity also makes it possible to use the same advanced robot welding fixture for a variety of boat models.

The mechanical design of a transfemoral prosthesis using computational tools and design methodology
Sánchez,J; Hernández,R. J; Torres,J. E;
Ingeniería e Investigación , 2012,
Abstract: artificial limb replacement with lower limb prostheses has been widely reported in current scientific literature. there are many lower limb prosthetic designs ranging from a single-axis knee mechanism to complex mechanisms involving microcontrollers, made from many materials ranging from lightweight, high specific strength ones (e.g., carbon fibre) to traditional forms (e.g., stainless steel). however, the challenge is to design prostheses whose movement resembles the human body's natural movement as closely as possible. advances in prosthetics have enabled many amputees to return to their everyday activities; however, such prostheses are expensive, some costing as much as $60,000. many of the affected population in colombia have scarce economic resources; there is therefore a need to develop affordable functional prostheses. the universidad del norte's materials, processes and design research group and the robotics and intelligent systems group have been working on this line of research to develop modular prostheses which can be adjusted to each patient's requirements. this research represents an initial methodological approach to developing a prosthesis in which software tools have been used (the finite element method) with a criteria relationship matrix for selecting the best alternative while considering different aspects such as modularity, cost, stiffness and weight.
The mechanical design of a transfemoral prosthesis using computational tools and design methodology Dise o mecánico para una prótesis transfemoral mediante el uso de herramientas computacionales y metodologías de dise o
Sánchez Otero John,Hernández Roque J.,Torres S. Jaime E.
Ingeniería e Investigación , 2012,
Abstract: Artificial limb replacement with lower limb prostheses has been widely reported in current scientific literature. There are many lower limb prosthetic designs ranging from a single-axis knee mechanism to complex mechanisms involving microcontrollers, made from many materials ranging from lightweight, high specific strength ones (e.g., carbon fibre) to traditional forms (e.g., stainless steel). However, the challenge is to design prostheses whose movement resembles the human body’s natural movement as closely as possible. Advances in prosthetics have enabled many amputees to return to their everyday activities; however, such prostheses are expensive, some costing as much as $60,000. Many of the affected population in Colombia have scarce economic resources; there is therefore a need to develop affordable functional prostheses. The Universidad del Norte’s Materials, Processes and Design Research Group and the Robotics and Intelligent Systems Group have been working on this line of research to develop modular prostheses which can be adjusted to each patient’s requirements. This research represents an initial methodological approach to developing a prosthesis in which software tools have been used (the finite element method) with a criteria relationship matrix for selecting the best alternative while considering different aspects such as mod-ularity, cost, stiffness and weight. El desarrollo de prótesis para extremidades inferiores es reportado profusamente en la literatura científica actual. Hay disponible una gran variedad de dise os de prótesis de miembro inferior, que van desde un mecanismo de rodilla de eje simple hasta complejos mecanismos con microcontroladores, fabricados con una gama de materiales que van desde los ligeros de alta resistencia específica, como la fibra de carbono, hasta tradicionales como el acero inoxidable. Sin embargo, el reto es dise ar prótesis cuyo movimiento se asemeje, lo más posible, al del cuerpo humano. El desarrollo de prótesis ha hecho posible que muchas personas amputadas vuelvan a desempe arse en sus actividades; sin embargo, estas prótesis son de costos elevados, algunas pueden llegar a valer hasta 60 000 dólares. Gran parte de la población afectada en Colombia es de escasos recursos, por lo tanto se hace necesario el desarrollo de prótesis funcionales de bajo costo. El Grupo de Investigación en Materiales, Procesos y Dise o y el Grupo de Robótica y Sistemas Inteligentes de la Universidad del Norte vienen trabajando en esta línea de investigación con el objetivo de desarrollar prótesis modulares que se puedan ajustar
Criterios para Seleccionar Sistemas de Dise?o y Manufactura Asistidos por Computadora (CAD/CAM)
Martínez,R.R.;
Información tecnológica , 2004, DOI: 10.4067/S0718-07642004000200016
Abstract: the objective of this study was to present in clear form the fundamental principles required to obtain a criterion of the advantages and disadvantages of computer aided design and manufacturing systems (cad/cam). the idea for setting these selection criteria were obtained during the initial acquisition of a cad/cam system. a numerical control by computer (cnc) machine was adapted to two modalities of cam, the first with an integrated cad system and another with autocad interaction. from the analysis it was determined that it was immaterial whether or not the use of cad software was from the same company that produced the cam software. the results of these experiments and observations provide a fundamental tool for selecting an efficient cad/cam system
Práticas e desafios na prepara??o da produ??o em projetos de novos produtos de higiene pessoal
Tarallo, Felipe Botta;Amaral, Daniel Capaldo;
Produ??o , 2008, DOI: 10.1590/S0103-65132008000300011
Abstract: the new product development process (pdp) literature doesn't give significant focus on manufacturing process specification and validation. nevertheless, in some areas this subject is one of the main competitive advantage sources. the consumer goods industry that's related with high production level is an example. this paper presents a case study about an especific consumer goods producer from personnel higienic segment. it demonstrates the importance of this product development phase, the barriers, and the theoric gap, applying a business process modelling approach. the annalysis was based on the product development process model elaborated, interviews with stakeholders, documental analysis and participant observation. besides presenting and discussing this enterprise experience, the paper brings an actual theory annalysis and future research statements.
Estrutura de informa??o como suporte em múltiplas vistas do produto num projeto orientado para a manufatura
Canciglieri Junior, Osiris;Young, Robert I. M.;
Produ??o , 2006, DOI: 10.1590/S0103-65132006000200014
Abstract: actually the activities of overall design must be well orchestrated and integrated which has led to the evolution of the philosophy of concurrent engineering where the decisions about different aspects related to the product's life cycle, must be considered simultaneously. however, when the full breadth of design for manufacture is considered there are many aspects that must be addressed. this leads to the need for information systems to be able to support multiple views of a product, where each view provides the appropriate representation to support at least one manufacturing perspective. this research has investigated the potential of product model based systems to support multiple viewpoints in design for manufacture. the research has focused on the design for manufacture of plastic injection moulded products and has explored the particular viewpoints of mouldability, mould design and mould manufacturing. the approach taken has been to explore particular information structures to support each design for manufacture application. an experimental product model has been implemented using an object-oriented database.
Criterios para Seleccionar Sistemas de Dise o y Manufactura Asistidos por Computadora (CAD/CAM) Criteria for the Selection of Computer Aided Design and Manufacturing Systems (CAD/CAM)
R.R. Martínez
Información Tecnológica , 2004,
Abstract: Este estudio tiene como objetivo presentar en forma clara los principios fundamentales que se requieren para tener un criterio sobre las bondades e inconvenientes de los sistemas Dise o y Manufactura Asistidos por Computadora (CAD/CAM). La inquietud nació por algunos problemas presentados en la primera adquisición de un sistema de CAD/CAM. Se adaptó a una máquina de Control Numérico por Computadora (CNC) las dos modalidades de CAM, el primero con el sistema de CAD integrado y la otra con interacción en AutoCAD. Del análisis se determinó la indiferencia de usar un software de CAD desarrollado por la misma compa ía del CAM. El resultado de estos experimentos y observaciones proporciona una herramienta fundamental para seleccionar un sistema de CAD/CAM eficiente The objective of this study was to present in clear form the fundamental principles required to obtain a criterion of the advantages and disadvantages of computer aided design and manufacturing systems (CAD/CAM). The idea for setting these selection criteria were obtained during the initial acquisition of a CAD/CAM system. A Numerical Control by Computer (CNC) machine was adapted to two modalities of CAM, the first with an integrated CAD system and another with AutoCAD interaction. From the analysis it was determined that it was immaterial whether or not the use of CAD software was from the same company that produced the CAM software. The results of these experiments and observations provide a fundamental tool for selecting an efficient CAD/CAM system
Effect of pontic framework design on the fracture resistance of implant-supported all-ceramic fixed partial dentures
Inan, Ozgur;Secilmis, Asli;Eraslan, Oguz;
Journal of Applied Oral Science , 2009, DOI: 10.1590/S1678-77572009000500032
Abstract: objective: the purpose of this study was to compare the fracture resistance of implant-supported all-ceramic fixed partial dentures, which have three different pontic designs. material and methods: two implants were placed in a metal model simulating mandibular left second premolar and mandibular left second molar. thirty standardized 3-unit all-ceramic fixed partial dentures with biconvex, convex or concave pontic designs were fabricated using ips e.max system (n=10). afterwards, specimens were centrally loaded on the pontics until failure with a universal testing machine. results were analyzed by kruskal-wallis and mann-whitney u tests at 5% significance level. results: the fracture resistance values of all-ceramic fixed partial dentures designed with biconvex, convex or concave pontics were 349.71, 438.20 and 300.78 n, respectively. there were no statistically significant differences between the fracture resistances of the groups (p>0.05), except for convex and concave groups (p<0.05 and p=0.009, respectively). conclusions: convex design showed the best mechanical properties as demonstrated by the high values of fracture resistance.
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