Download or read book Design Structural Analysis and Manufacture of Transtibial Prosthetic Sockets with 3D Printing written by Andrea Ballart Iglesias and published by . This book was released on 2020 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This project will cover how to design, validate and manufacture prostheses with 3D printing; specifically, transtibial prosthetic sockets. The project starts with a research on 3D printing and its applications, as well as 3D printing types and materials. Besides, the project covers a complete research on prostheses and its classification. Then, the project is focused specifically on transtibial prostheses, and its components and types are described. All components except the socket are available in the market as standard parts, and they just need to be properly selected to satisfy patients' requirements. On the other hand, the socket must be completely designed and customized for each patient. For this reason, manufacturing prosthetic sockets with 3D printing technology brings a huge variety of advantages, which are carefully described in this project. Afterwards, a study of human movements and stump critical anatomical areas has been done. In addition, a kinematic and dynamic analysis of the human leg and socket has been carried out. With these specifications, an initial prosthetic socket has been designed with a CAD software chosen. When the initial socket has been designed, a validation and geometry iteration phase has been carried out. The suitable 3D printing material has been chosen, and a Finite Elements Analysis has been done with Ansys software. The maximum loads during a human gait cycle calculated in the dynamic analysis have been applied in the FE analysis. The objective of the FE analysis is to prove the maximum equivalent stress and deformations that the prosthetic socket can support without failure based on the ultimate strength of the material chosen. Geometry and thickness modifications of the socket have been needed to obtain the desired safety factor. After all these steps, the final socket has been designed, validated and 3D printed successfully. Finally, results obtained have been compared to traditional socket characteristics. A business case of prosthetic sockets manufacturing with 3D printing versus traditional manufacturing has been developed and a list of potential next steps has been defined.

Download or read book Modeling and fabrication of prosthetic sockets using selective laser sintering written by and published by . This book was released on 2004 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Successful rehabilitation of transtibial amputees involves effective fitting of prosthetic components. However, conventional techniques used to produce sockets with suitable characteristics are labor intensive and expensive, and depend on the work of skilled prosthetists that are relatively scarce compared to the number of transtibial amputees. Selective Laser Sintering (SLS) is a very promising technique for producing subject-specific sockets for transtibial amputee prostheses due to its inherent ability to create complex three-dimensional objects directly from digital shape information without the need for specific tooling, molds or human labor. This dissertation presents a framework for the design, analysis, manufacture and testing of SLS sockets for transtibial prostheses, including the development of a computer-aided design model of the socket with compliant features to enhance comfort, structural analysis using a Finite Element Method (FEM) model, fabrication of a functional prototype using SLS, and experimental validation of the FEM analysis. The validation involved quantifying the failing conditions of sockets manufactured using the framework during destructive tests. The experimental failure loads for the sockets were within a 3% range of the FEM results and were considered satisfactory. The specific design of orthogonally compliant features for socket was also analyzed. This process included the preliminary evaluation of design alternatives using FEM with validation through experimental measurements, definition of specific design methodology for the best alternatives, incorporation of solution within the socket and refinement of design using auxiliary features obtained through topology optimization. Finally, to investigate the structural response of the SLS socket during gait, a FEM model (acquired from Computed Tomography data of a transtibial amputee) composed of a socket, liner and residual limb under quasi-static loading derived from typical ground reaction forces was employed. Three different compliant designs were evaluated to assess their ability to locally relieve local pressure during the stance phase of gait, as well as their structural integrity to ensure safety. The design with a compliant feature consisting of spiral slots within the socket wall was determined to produce a local average relief of 65.8% in the interface pressure, reducing the peak pressure from 172 kPa to 66.4 kPa.

Download or read book Computer Modelling of the Residual Limb for the Development of Prosthetic Sockets and Liners with the Cellular Structure written by Vasja Plesec and published by . This book was released on 2023 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The production of lower limb prostheses continues to rely primarily on manual methods, which are outdated and characterized by labour-intensive processes, lengthy time requirements, high costs, and a heavy reliance on the expertise of prosthetists. Achieving a satisfactory fit between the residual limb and socket remains a challenge, often leading to discomfort, pain, and potential wearer tissue damage. However, advancements in computer technology and numerical simulation offer an opportunity to predict stresses and strains experienced by the residual limb during prosthesis usage. This, in turn, aids in the development process by enhancing the design of the prosthetic socket and liner through virtual environments. In this dissertation we developed a generic numerical transtibial model to bridge the gap between clinical practice and numerical simulations. Biomechanically validated, this model generates outcomes applicable to a broader amputee population, facilitating comparative analysis of socket and liner designs and materials under different loading conditions. Furthermore, the dissertation explores the utilization of a 3D-printed socket manufactured through the cost-effective fused filament fabrication process, using polylactic acid filament, aiming to reduce the costs and establish a streamlined production process. The 3D-printed socket was evaluated within the virtual environment using the developed transtibial model. The numerical findings indicate that the 3D-printed socket can effectively withstand the loads encountered during the stages of prosthesis donning, single-leg stance, heel strike, and push-off, thereby presenting a viable alternative to the prevalent composite socket. Additionally, a cellular structure composed of a flexible thermoplastic elastomeric material is proposed as a prosthetic liner to enhance comfort by reducing contact pressure while maintaining the required stability. Numerical results indicate that by manipulating cellular parameters such as unit cell type and relative density of the structure, a customized response can be achieved. This customized response effectively reduces contact pressure for a given scenario without increasing displacement, thereby improving comfort while maintaining stability.

Download or read book Digital Design and Manufacturing of Medical Devices and Systems written by Rajkumar Velu and published by Springer Nature. This book was released on with total page 255 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Evaluation of 3D Printing as a Means of Manufacturing Trans tibial Prosthetic Sockets written by Nicholas Scarth Herbert and published by . This book was released on 2004 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Manufacture and Design of Prosthetics written by Nicholas Zeniou and published by . This book was released on 2018 with total page 158 pages. Available in PDF, EPUB and Kindle. Book excerpt: Additive manufacturing AM is an emerging technology that offers the ability to create parts without moulds, material wastage or labour. This offers a wide range of industries to rapidly produce both prototypes and end use products with extraordinary design freedom and a high level of customisation. The widely used AM methods are limited in the working materials which are most commonly high cost, heavy metals or low cost and performance plastics. Options for the AM of composite materials are limited, yet they are the material of choice for high performance applications. Modern composite materials are used to manufacture light-weight structures with high strength to weight ratios. The manufacture of composites is largely dependent on skilled labour, customised moulds and expensive tooling which are all manufacturing complexities that additive manufacturing eliminates. The additive manufacture of long fibre thermoset composites is an opportunity which is currently a topic of research at the University of Auckland. There are many industries which seek to benefit from long fibre 3d printing but the decision on the market entry point for such a technology is a multi-variant problem. Market research indicated that the prosthetics manufacturing industry to be a suitable market entry point. The manufacturing complexities associated with composite manufacture are exaggerated in this industry due to the need to meet the unique requirements of each patient and the New Zealand industry has expressed a strong desire to adopt new technology. The purpose of the project described in this thesis is to acquire knowledge about the requirements of prosthetic design and manufacture for the application of composite 3d printing. Interviews and work shadowing with the New Zealand Artificial Limb Service NZALS was conducted in order to understand the process behind manufacturing prosthetics. Laminate modelling and analysis followed by experimental validation showed the fibreglass laminates used by the NZALS to have an ultimate tensile stress between 50MPa and 60MPa. The strength and stiffness of the NZALS socket laminates was used determined the target volume fraction for printing to be 30% carbon fibre. Finite element analysis was used to further investigate the performance requirements of prosthetic sockets by modelling their structural behaviour. Test methods prescribed by ISO 10328 were used to develop a modelling methodology to analyse the response of a socket under load and the performance of laminates used. The model was validated using experimental data with predicted strain within 20% of the experimentally measured strain in critical areas of the socket. This model can now be used as a tool to work with the NZALS to further refine their socket lamination methods. The mechanical properties of socket laminates can now be quantified and compared such that more informed decisions can be made to improve current socket lamination practice. This modelling procedure also enables new materials created with 3d printing to be evaluated against current material systems to provide prosthetists and amputees more confidence in emerging digital manufacturing methods.

Download or read book Advanced Prototyping of Variable Impedance Prosthetic Sockets for Trans tibial Amputees written by David Moinina Sengeh and published by . This book was released on 2012 with total page 68 pages. Available in PDF, EPUB and Kindle. Book excerpt: This work, supported by the Media Lab Consortium, evaluates the design of a Variable Impedance Prosthetic (VIPr) socket for a transtibial amputee using computer-aided design and manufacturing (CAD/CAM). Compliant features are seamlessly integrated into a 3D printed socket to achieve lower interface peak pressures over bony protuberances by using anthropomorphic data acquired through surface scanning and magnetic resonance imaging techniques. An inverse linear mathematical transformation spatially maps quantitative measurements (bone tissue depth) of the human residual limb to the corresponding socket shape and impedance characteristics. The CAD/CAM VIPr socket is compared to a state-of-the-art prosthetic socket of similar internal geometry and shape, designed by a prosthetist using conventional methods. An active, bilateral transtibial male amputee of weight 70 kg walks on a force plate loaded 5-meter walkway, at self-selected speeds while synchronized ground reaction forces, motion capture data and socket residual limb interface pressures are measured for the evaluated sockets. We anticipated a decreased average interface pressure (measured using the Teksan F-SocketTM pressure sensors) in the VIPr socket, especially over stiff anatomical landmarks including the fibula head, the tibia, lateral and medial femoral condyles and medial tibial flare. Contact interface pressure recorded during stance of a complete gait cycle indicated a 15% and 17% reduction at toe-off and heel-strike respectively at the fibula head while the subject uses a VIPr socket in comparison to a conventional socket of similar internal shape. A corresponding 7% and 8% reduction in pressure is observed along the tibia. Similar trends of high-pressure reductions are observed during stair ascent trials with the VIPr socket.

Download or read book Advances for Prosthetic Technology written by Robert LeMoyne and published by Springer. This book was released on 2016-03-10 with total page 145 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book focuses on the advances in transtibial prosthetic technology and targets research in the evolution of the powered prosthesis such as the BiOM, which was derived from considerable research and development at the Massachusetts Institute of Technology. The concept of the book spans the historical evolution of prosthetic applications from passive to new and futuristic robotic prosthetic technologies. The author describes the reasons for amputation, surgical procedures, and an historical perspective of the prosthesis for the lower limb. He also addresses the phases and sub-phases of gait and compensatory mechanisms arising for a transtibial prosthesis and links the compensatory mechanisms to long-term morbidities. The general technologies for gait analysis central to prosthetic design and the inherent biomechanics foundations for analysis are also explored. The book reports on recent-past to current-term applications with passive elastic prostheses. The core of the book deals with futuristic robotic prostheses including their function and major subsystems, such as actuator technology, state machine control, and machine learning applications. Finally, the envisioned future trends in the prosthetic technology space are presented.

Download or read book Additive Manufacturing Processes in Biomedical Engineering written by Atul Babbar and published by CRC Press. This book was released on 2022-07-29 with total page 243 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book covers innovative breakthroughs in additive manufacturing processes used for biomedical engineering. More and more, 3D printing is selected over traditional manufacturing processes, especially for complex designs, because of the many advantages such as fewer restrictions, better production cost savings, higher quality control, and accuracy. Current challenges and opportunities regarding material, design, cost savings, and efficiency are covered along with an outline of the most recent fabrication methods used for converting biomaterials into integrated structures that can fit best in anatomy while still obtaining the necessary architecture, mechanical reliability, biocompatibility, and anti-bacterial characteristics needed. Additional chapters will also focus on selected areas of applications such as bionics, affordable prostheses, implants, medical devices, rapid tooling, and drug delivery. Additive Manufacturing Processes in Biomedical Engineering: Advanced Fabrication Methods and Rapid Tooling Techniques acts as a first-hand reference for commercial manufacturing organizations which are mimicking tissue organs by using additive manufacturing techniques. By capturing the current trends of today’s manufacturing practices this book becomes a one-stop resource for manufacturing professionals, engineers in related disciplines, and academic researchers.

Download or read book Special Issue of the Manufacturing Engineering Society 2019 SIMES 2019 written by Eva M. Rubio and published by MDPI. This book was released on 2020-07-03 with total page 534 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book derives from the Special Issue of the Manufacturing Engineering Society 2019 (SIMES-2019) that has been launched as a joint issue of the journals Materials and Applied Sciences. The 29 contributions published in this Special Issue of Materials present cutting-edge advances in the field of manufacturing engineering focusing on additive manufacturing and 3D printing; advances and innovations in manufacturing processes; sustainable and green manufacturing; manufacturing of new materials; metrology and quality in manufacturing; industry 4.0; design, modeling, and simulation in manufacturing engineering; and manufacturing engineering and society. Among them, the topic "Additive Manufacturing and 3D Printing" has attracted a large number of contributions in this journal due to its widespread popularity and potential.

Download or read book Stress Distribution and Optimum Design of Polypropylene and Laminated Transtibial Prosthetic Sockets FEM and Experimental Implementations written by Hayder Al-Shuka and published by GRIN Verlag. This book was released on 2018-02-08 with total page 87 pages. Available in PDF, EPUB and Kindle. Book excerpt: Scientific Study from the year 2017 in the subject Medicine - Other, , language: English, abstract: This study presents analyses for below knee prosthetic socket of a human. Socket stress distribution is performed on three types of socket, polypropylene (5mm), polypropylene (3mm) and a standard laminate (3mm) sockets to determine the stresses path through the prosthetic socket during the gait cycle. It is found that heel strike phase is the critical phase. The stresses increase at the socket base while the maximum deflection is maximum at the patellar region of the socket. This work is achieved by finite element program, ANSYS. The development of design specifications of a below the knee prosthetic socket is presented in this study for successful ambulation and comfort. Seven different design models are created by changing the socket wall thickness and the material. Polypropylene socket gives the best results with regard to the allowable deflection for the regions of the pressure relief areas of the stump. The effect of varying the modulus of elasticity on the polypropylene socket is considered in this study. Three models are analyzed with different tensile creep moduli during different periods. It is found that the polypropylene socket will enlarge in size with time. An experimental study is conducted to compare the strength of five prosthetic sockets made of different materials. Compression, three-point flexural and tensile tests are implemented by the Testometric machine. The laminate sockets have larger compressive stiffness than polypropylene while polypropylene has larger flexural stiffness than the tested laminates except for socket No.5.

Download or read book 3D Printing in Biomedical Engineering written by Sunpreet Singh and published by Springer Nature. This book was released on 2020-07-16 with total page 346 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book gives a comprehensive overview of the rapidly evolving field of three-dimensional (3D) printing, and its increasing applications in the biomedical domain. 3D printing has distinct advantages like improved quality, cost-effectiveness, and higher efficiency compared to traditional manufacturing processes. Besides these advantages, current challenges and opportunities regarding choice of material, design, and efficiency are addressed in the book. Individual chapters also focus on select areas of applications such as surgical guides, tissue regeneration, artificial scaffolds and implants, and drug delivery and release. This book will be a valuable source of information for researchers and professionals interested in the expanding biomedical applications of 3D printing.

Download or read book Design and Analysis of a Volume Adjustable Transtibial Prosthetic Socket for Pediatric Amputees in Developing Countries written by Meagan Renee Vaughan and published by . This book was released on 2010 with total page 232 pages. Available in PDF, EPUB and Kindle. Book excerpt: For pediatric amputees in developing countries, where characteristically rapid growth of children is compounded by a lack of medical services, maintaining proper socket fit is a challenging but necessary endeavor. A socket design that adjusts for radial and longitudinal growth will allow patients to wear the same socket for a longer period of time saving them the expense of subsequent fittings and hardware. Manufacture of such a socket poses a challenge for contemporary manufacturing processes. Due to its ability to rapidly manufacture complex part geometries, Selective Laser Sintering (SLS) is particularly suited to this application. Several preliminary design concepts for a volume adjustable transtibial SLS prosthetic socket for pediatric amputees in developing countries have been generated. These current design concepts utilize fasteners such as ratchet hooks and threads. Results from design and validation of theoretical models of these fastener concepts are the focus of this thesis.

Download or read book Rapid Manufacturing written by Neil Hopkinson and published by John Wiley & Sons. This book was released on 2006-02-22 with total page 304 pages. Available in PDF, EPUB and Kindle. Book excerpt: Rapid Manufacturing is a new area of manufacturing developed from a family of technologies known as Rapid Prototyping. These processes have already had the effect of both improving products and reducing their development time; this in turn resulted in the development of the technology of Rapid Tooling, which implemented Rapid Prototyping techniques to improve its own processes. Rapid Manufacturing has developed as the next stage, in which the need for tooling is eliminated. It has been shown that it is economically feasible to use existing commercial Rapid Prototyping systems to manufacture series parts in quantities of up to 20,000 and customised parts in quantities of hundreds of thousands. This form of manufacturing can be incredibly cost-effective and the process is far more flexible than conventional manufacturing. Rapid Manufacturing: An Industrial Revolution for the Digital Age addresses the academic fundamentals of Rapid Manufacturing as well as focussing on case studies and applications across a wide range of industry sectors. As a technology that allows manufacturers to create products without tools, it enables previously impossible geometries to be made. This book is abundant with images depicting the fantastic array of products that are now being commercially manufactured using these technologies. Includes contributions from leading researchers working at the forefront of industry. Features detailed illustrations throughout. Rapid Manufacturing: An Industrial Revolution for the Digital Age is a groundbreaking text that provides excellent coverage of this fast emerging industry. It will interest manufacturing industry practitioners in research and development, product design and materials science, as well as having a theoretical appeal to researchers and post-graduate students in manufacturing engineering, product design, CAD/CAM and CIFM.

Download or read book Biomechanics of Lower Limb Prosthetics written by Mark R. Pitkin and published by Springer. This book was released on 2009-10-14 with total page 153 pages. Available in PDF, EPUB and Kindle. Book excerpt: Foreword from a Clinical Biomechanist, Applied Physiologist and Prosthetist teaching graduate students in Prosthetics & Orthotics. While there are many books on Biomechanics, arguably the quintessential science of limb prosthetics, none addresses the fundamental principles in sufficient detail and depth to be practically useful to the prosthetist, rehabilitation specialist or researcher. Dr. Pitkin’s monograph is an exemplary collection of theoretical principles from his research and o- ers, presented in its clinical and applied biomechanics form. The textbook provides an excellent overview of the many facets of lower limb prosthetic design and engineering for the ardent clinician researcher and student. The book delves into many of the basic concepts that are required knowledge for the clinician and the scientist to have as the foundation for their work. Dr. Pitkin has an e- quent manner in which he reflects on the history and literature to tell the storied evolution of prosthetic design . He takes the reader on a journey to consider his theories, which have substantive foundations to contemplate. By the end of chapter one, we have the basic h- tory and an appreciation for the rationale behind the “rolling joint ankle” with evidence to support his theoretical views.

Download or read book High Value Manufacturing Advanced Research in Virtual and Rapid Prototyping written by Maria K. Todd and published by CRC Press. This book was released on 2013-09-16 with total page 650 pages. Available in PDF, EPUB and Kindle. Book excerpt: High Value Manufacturing is the result of the 6th International Conference on Advanced Research in Virtual and Rapid Prototyping, held in Leiria, Portugal, October 2013. It contains current contributions to the field of virtual and rapid prototyping (V&RP) and is also focused on promoting better links between industry and academia. This volume

Download or read book Fused Deposition Modeling Based 3D Printing written by Harshit K. Dave and published by Springer Nature. This book was released on 2021-04-21 with total page 517 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book covers 3D printing activities by fused deposition modeling process. The two introductory chapters discuss the principle, types of machines and raw materials, process parameters, defects, design variations and simulation methods. Six chapters are devoted to experimental work related to process improvement, mechanical testing and characterization of the process, followed by three chapters on post-processing of 3D printed components and two chapters addressing sustainability concerns. Seven chapters discuss various applications including composites, external medical devices, drug delivery system, orthotic inserts, watertight components and 4D printing using FDM process. Finally, six chapters are dedicated to the study on modeling and optimization of FDM process using computational models, evolutionary algorithms, machine learning, metaheuristic approaches and optimization of layout and tool path.