Download or read book Redesign of a Volume Adjustable Transtibial Prosthetic Socket written by Samuel Terrazas Quezada and published by . This book was released on 2017 with total page 133 pages. Available in PDF, EPUB and Kindle. Book excerpt:

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 A Low cost Volume Adjustable Lower Limb Prosthetic Socket written by Meagan Renee Vaughan and published by . This book was released on 2014 with total page 502 pages. Available in PDF, EPUB and Kindle. Book excerpt: An issue of great concern for amputees continues to be lack of proper fit and comfort in their sockets. This lack can often be attributed to changes in the shape of the residual limb that cannot be compensated for by existing prosthetic socket technology. In regions where cost is a prohibitive factor in the replacement of ill-fitting prosthetic sockets, the need for a volume adjustable, and potentially longer lasting, socket design is abundant. This research focuses on designing a volume adjustable lower limb prosthetic socket that accommodates the needs of amputees in underdeveloped countries using collaborative design techniques. Though advocated as a means of accurately identifying and satisfying their needs, including end-users in the design process often adds an additional layer of complexity because of differences in culture, language, or geography among the participants. This research therefore includes a study in which product design techniques were applied to the same volume adjustable socket design problem with a variety of users -- typical users, lead users, and new Empathic Lead Users -- from different countries, one developed and one developing. To overcome differences among participants, this research includes an alternative strategy to create Empathic Lead Users (ELU) from non-user product design engineers through the use of simulated lead user experiences. As a result of this study, customer needs analysis with ELU helps to identify 95% of traditional and lead user customer needs and 100% more latent needs, and possibly more avenues for product innovations, than interviewing lead or traditional users alone. The concepts generated by all users were also compared. Based on the resulting concepts' novelty, variety, quality, and quantity, all users were able to satisfactorily complete the concept generation exercises and produced competitive design solutions. Using the concepts generated during this co-design study, a volume adjustable socket was developed. The final socket design, based on the analogous rotational movement of a camera aperture, is pursued through mechanical and subject testing. Early users of the socket liked the design and it has been demonstrated to provide the necessary volume adjustments, but future design iterations to improve its comfort are necessary.

Download or read book Design of an Adjustable Volume Prosthetic Leg Socket for a Below Knee Amputee written by Christopher Quadroy and published by . This book was released on 1992 with total page 110 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Problems arise with the prosthetic fit of the socket and liner of a below knee prosthesis due to daily fluctuations in stump volume. Much harm can be done to the stump with continued use of a prosthetic socket, which through changes in the stump has ceased to fit. Any factors which put at risk the health of the stump are undesirable. The prime objective of the project was therefore to design a prosthetic leg socket and liner for below knee amputees, in which the socket volume could be easily and conveniently adjusted to account for daily stump volume fluctuations. This was seen as providing a means in which the fit of a prosthesis could be regulated, thus encouraging greater stump health, and increasing the level of comfort for the wearer during everyday use. Whilst extensive testing is yet to be carried out, the results from initial trialling of a prototype prosthesis indicate that the application of an adjustable volume prosthetic socket and liner will be able to be successfully adopted if an appropriate amount of time and resources is spent in following up the work done to date. The testing undertaken to date has revealed that the prototype design requires further work and improvement in basic fabrication, the durability of some components being well below that expected if the unit is to become viable. This report concludes with a list of recommendations and further work requirements which should be undertaken to improve the current prototype, and continue development of the concept. " -- Abstract/Synopsis.

Download or read book The Use of a Novel Residuum Model to Design a Variable impedance Transtibial Prosthetic Socket written by David Moinina Sengeh and published by . This book was released on 2016 with total page 77 pages. Available in PDF, EPUB and Kindle. Book excerpt: For people living with limb amputation, the prosthetic socket - the interface between the residuum and prosthesis - is the most critical component. When a socket is uncomfortable, especially due to poor fit, the quality of life for a patient is greatly hindered. However, conventional design of sockets is largely artisan, with limited input of quantitative data. Current computer-aided and manufacturing (CAD/CAM) designs are still not clinically applicable solutions. Due to model identification procedures that employ non patient-specific and incomplete data sets, today's finite element (FE) models of the residuum are not predictive, leading to suboptimal socket designs. As such, there exists a need for a comprehensive biomechanical model of the residuum for the quantitative design and computational evaluation of patient-specific prosthetic sockets. This thesis presents a combined experimental-numerical approach to evaluate and validate a transtibial residuum biomechanical model. The central hypothesis of the work is that a single biomechanical model can predict the large non-linear response at various sites on a residuum under load. To evaluate this hypothesis, a non-linear, two-tissue model was formulated where tissue geometries were defined using MRI data of the residuum. The non-linear viscoelastic material parameters of the model were identified through inverse FEA-based optimization using in-vivo indentation experimental data at four locations. Using optimized model tissue parameters, the mean percentage error (mean absolute error/ maximum experimental force) between the experimental and simulation force-time curves at 14 other locations across the evaluated transtibial residuum was 7 ± 3%. Using this same modeling methodology and a single set of material constants to describe the bulk soft tissue biomechanical response of seven distinct transtibial residual limb models, the average percentage error for indentations at multiple locations across all seven limbs was 7 ± 1%. From these predictive models of residuum limbs, one rigid novel socket and two multimaterial transtibial sockets were designed, fabricated and evaluated through an entirely quantitative, automated and repeatable methodology. In a preliminary clinical investigation, the novel sockets were shown to reduce peak contact pressures at the tibia and fibular head regions on the residuum by significant amounts during standing compared to a conventional socket interface designed and fabricated by a trained prosthetist.

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 Soft Tissue Control During Hydrostatic Shape Capture for Trans tibial Prosthetic Provision written by Lyndsey Calvin and published by . This book was released on 2015 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Current methods of prosthetic socket design are inadequate. A socket that fits well should demonstrate minimal longitudinal displacement from mid-stance through swing phase of the gait cycle and minimal rotational and transverse movements. To eliminate these issues, the socket should match the surface and volume of the residuum. Of the various methods for creating a prosthetic socket, hydrocasting is the only one which offers volume- and surface-matching under load bearing conditions that are analogous to the stance phase of the gait cycle. However the uniform pressure forces the soft tissue of the stump to redistribute causing the residuum to be shorter and wider. The socket produced from this design method will not demonstrate volume- and surface-matching during swing; this mismatch causes longitudinal displacement, a phenomenon known as pistoning. A Chinese finger trap weave prototype and a polyethylene cylindrical mesh prototype embedded in silicone were developed and tested for radial grip, forces measured on analogue limb, and proximal-to-distal displacement. 3-D CAD models of the weave and mesh were built and tested for radial grip and displacement using an FEA plugin. The data from the empirical grip test was invalid for technical errors. The weave alone was the most successful prototype in empirical displacement testing; this prototype experienced the largest and most consistent displacement in relation to applied tension. The 3-D CAD models were completed, but could not be tested due to time constraints. Future work will include experimenting with different embedding materials; 3-D CAD models will be modified and simulated.

Download or read book Prosthetic Socket Design written by Arthur J. Petron and published by . This book was released on 2016 with total page 197 pages. Available in PDF, EPUB and Kindle. Book excerpt: The prosthetic socket, the mechanical interface between an amputated residuum and an external prosthesis, is of critical importance to the performance of a prosthetic limb system. Conventional prosthetic socket technology is derived using a non-quantitative, artisan methodology. Consequently, a comfortable socket interface cannot be made reproducibly, and persons with limb amputation too often experience discomfort. As a resolution to this difficulty, the field of digital prosthetic socket design seeks to advance a quantitative CAD/CAM methodology for socket production to produce reproducible and comfortable interfaces. Prosthetic researchers have proposed a digital socket production work flow comprising the steps of 1) assessment of residuum tissue biomechanics; 2) modeling optimization of the residuum-socket interface, and 3) fabrication of a variable-impedance socket system based upon these optimizations. In this thesis, two novel technologies are designed, built and evaluated at either end of this work flow, namely a multi-indenter device for in vivo biomechanical tissue measurement and a quasi-passive variable-impedance transtibial socket interface. An active indenter platform called the FitSocket is presented. To assess residual-limb tissue biomechanics, the FitSocket comprised 14 position and force controllable actuators that circumferentially surround a biological residuum to form an actuator ring. Each actuator is individually controllable in position (97.1?m accuracy) and force (330mN accuracy) at a PC controller feedback rate of 500Hz, allowing for a range of measurement across a residuum. At five distinct anatomical locations across the residual limb, force versus deflection data are presented, demonstrating the accuracy and versatility of the FitSocket for residual limb tissue characterization. A passive, single indenter version of the FitSocket, called the FitPen, is also presented. The FitPen is designed to be ultra-portable in order to take biomechanical measurements in the field outside the laboratory setting. A quasi-passive socket (QPS) is presented having spatially and temporally varying socket wall impedances. The QPS is an autonomous computerized transtibial prosthetic interface that can stiffen or become compliant using computer-controlled electrolaminate actuators. The QPS measures forces applied by the limb on the socket, 3-axis acceleration of the socket, and the position of the electrolaminates. On a test participant with transtibial amputation, the socket was evaluated through sit-to-stand tests to determine the viability of computer-controlled electrolaminate engagement, and through a walking study to evaluate the ability of the electrolaminates to maintain their clutched state during ambulation at a self-selected walking speed. The average deflections of forced tibia movement in the sit-to-stand tests were 7 ± 2 mm while sitting with the electrolaminates in an unclutched state, and 2.1 ± 0.6 mm while standing with the electrolaminates in a clutched state. Further, the walking study showed a maximum unclutched deflection (3.7 ± 0.9 mm)16 times larger than that of the maximum deflection while clutched. This work was supported by the United States Department of Veteran Affairs through the VA Innovation Initiative (VAi2) program.

Download or read book In Pursuit of Socket Harmony written by Glenn M. Street and published by . This book was released on 2019 with total page 248 pages. Available in PDF, EPUB and Kindle. Book excerpt: For Amputees and Those Soon to BeThe Reality of Amputation; Shopping for Surgeons; Keys to Wound Healing; Keys to Limb Quality; Note on Bone Bridging; Note on Revision Surgery; The Reality of Prosthetics; Your Responsibilities; Preface to Prosthetic Quality; Keys to Prosthetic Quality; Final Words; Glossary; References; About the Authors; Index; Blank Page

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 Investigation and Design of an Actively Actuated Lower limb Prosthetic Socket written by John Thomas Montgomery and published by . This book was released on 2009 with total page 186 pages. Available in PDF, EPUB and Kindle. Book excerpt: A prosthetic socket worn by an amputee must serve a wide variety of functions, from stationary support to the transfer of forces necessary to move. Fit and comfort are important factors in determining the therapeutic effectiveness of a socket. A socket that does not fit the subject well will cause movement problems and potentially long-term health issues. Because a subject's residual limb changes volume throughout the day, it is desirable that the socket adapt to accommodate volume changes to maintain fit and comfort. This thesis presents research to manufacture adaptive sockets using selective laser sintering (SLS). This additive manufacturing process allows freedom to design a socket that has both compliant areas that can adapt to changes to the residual limb, as well as rigid regions to provide necessary support for the limb. A variety of concepts are discussed that are intended for manufacture by SLS, and that feature flexible inner membranes in various configurations. For each concept the membrane will be inflated or deflated to match the limb's change in volume and the thesis also presents a study to determine SLS machine parameters for optimal build results. A series of experiments was created to understand the ability of SLS manufactured plastics to be inflated and the possible performance.

Download or read book Physiological and Mechanical Effects of Prosthetic Elevated Vacuum Systems in People with Transtibial Amputation written by Robert Tyler Youngblood and published by . This book was released on 2019 with total page 126 pages. Available in PDF, EPUB and Kindle. Book excerpt: A major problem among people with a lower limb amputation is maintaining socket fit. Long-term and short-term changes of residual limb volume can alter socket fit resulting in pain, skin breakdown, or falls. Several strategies are used to accommodate the lost volume; however, many of these reduce the size of the socket potentially expediting long-term limb changes. Elevated vacuum (EV) has been used to maintain suspension and manage limb volume by evacuating the air between the prosthetic liner and the socket thus allowing fluid to be drawn into the limb. The physiological and mechanical effects of EV are not well understood as several research studies have evaluated the technique without a clear consensus. The aims of this dissertation were to evaluate the effectiveness of EV to manage limb fluid volume, model the mechanics of EV sockets, and optimize the effects of EV. A goal of this research was to better understand how EV functions and work towards establishing clinical guidelines for its use. The clinical effectiveness of EV to manage daily residual limb fluid volume was evaluated with an in-socket volume measurement technique during a protocol representative of daily activities. Bioimpedance analysis showed that rates of overall fluid volume change were unaffected by EV use compared to suction suspension (SS) with both conditions resulting in median rates of fluid volume loss. However, EV did reduce rates of limb fluid volume change during the final portion of the protocol after an accumulation of daily activity, suggesting benefit for high-activity users. Components of EV sockets such as liner properties, socket fit, and socket vacuum pressure interact to influence the physiological effects of EV such as limb fluid volume change and limb health. A physical benchtop model of an EV socket was developed to evaluate the ability of these EV components to influence physiology and to provide guidelines for clinical implementation of EV. Testing of this model demonstrated the ability to predict tissue vacuum pressure based on individual patient characteristics, prosthetic components, and socket fit. Additionally, the effect of EV on the residual limb tissue was found to be primarily determined by socket fit, while liner properties had minimal effect. Ideal EV parameters may differ for each individual depending on suspension needs, socket fit, prosthetic components, and health. Mechanical and physiological effects of EV were evaluated for optimizing vacuum pressure for three individuals. Multiaxial limb-socket displacement, limb fluid volume change, and user-reported socket comfort were measured at different socket vacuum pressures. Optical coherence tomography (OCT) imaging was used to measure skin perfusion at various tissue vacuum pressures, finding a potential dependency on the state of perfusion prior to vacuum application. Limb-socket displacement was the only metric to change consistently across participants. Changes to limb fluid volume and comfort suggested a more complex relationship unique to each individual. Adjusting socket vacuum pressure to balance the mechanical and physiological effects on individuals could improve EV implementation.

Download or read book Pressure Ulcer Research written by Dan L. Bader and published by Springer Science & Business Media. This book was released on 2005-12-14 with total page 383 pages. Available in PDF, EPUB and Kindle. Book excerpt: Presents both current and future aspects of diagnosis and treatment. Presents evidence-based knowledge of pressure ulcer aetiology. Contains over 90 illustrations. Explores the possiblities of tissue repair using new tissue engineering strategies.

Download or read book ROMANSY 21 Robot Design Dynamics and Control written by Vincenzo Parenti-Castelli and published by Springer. This book was released on 2016-06-29 with total page 436 pages. Available in PDF, EPUB and Kindle. Book excerpt: This proceedings volume contains papers that have been selected after review for oral presentation at ROMANSY 2016, the 21th CISM-IFToMM Symposium on Theory and Practice of Robots and Manipulators. These papers cover advances on several aspects of the wide field of Robotics as concerning Theory and Practice of Robots and Manipulators. ROMANSY 2016 is the 21st event in a series that started in 1973 as one of the first conference activities in the world on Robotics. The first event was held at CISM (International Centre for Mechanical Science) in Udine, Italy on 5-8 September 1973. It was also the first topic conference of IFToMM (International Federation for the Promotion of Mechanism and Machine Science) and it was directed not only to the IFToMM community.

Download or read book Atlas of Limb Prosthetics written by American Academy of Orthopaedic Surgeons and published by Amer Academy of Orthopaedic. This book was released on 2002-01-01 with total page 930 pages. Available in PDF, EPUB and Kindle. Book excerpt: Newly available after being out of print for several years, this is the definitive reference on the surgical and prosthetic management of acquired or congenital limb loss. Covers indications for amputation vs. limb salvage for trauma, peripheral vascular disease, and tumours; indications for prostheses for amputation levels; and rehabilitation approaches.

Download or read book Formulas for Stress Strain and Structural Matrices written by Walter D. Pilkey and published by John Wiley & Sons. This book was released on 2005 with total page 1544 pages. Available in PDF, EPUB and Kindle. Book excerpt: Publisher Description

Download or read book Advances in Mechanical Engineering written by Vilas R. Kalamkar and published by Springer Nature. This book was released on 2020-06-29 with total page 844 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents select peer-reviewed proceedings of the International Conference on Advances in Mechanical Engineering (ICAME 2020). The contents cover latest research in several areas such as advanced energy sources, automation, mechatronics and robotics, automobiles, biomedical engineering, CAD/CAM, CFD, advanced engineering materials, mechanical design, heat and mass transfer, manufacturing and production processes, tribology and wear, surface engineering, ergonomics and human factors, artificial intelligence, and supply chain management. The book brings together advancements happening in the different domains of mechanical engineering, and hence, this will be useful for students and researchers working in mechanical engineering.