Download or read book Design of Energy Storing Prosthetic Feet written by Ricky Chan (University of Manitoba student) and published by . This book was released on 1998 with total page 64 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Energy Storing Prosthetic Foot written by Mohamed Kamel Salim and published by . This book was released on 2000 with total page 312 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Design of an Energy Storing Prosthetic Foot Impact Absorption written by Robin Beam (University of Manitoba student) and published by . This book was released on 1999 with total page 50 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Energy Storing Prosthetic Feet written by Bill Contoyannis and published by . This book was released on 198? with total page 42 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book A Review of Energy Storing Prosthetic Feet and Computer Aided Structural Optimization of a Below knee Prosthesis written by Poonam Gope Lalwani and published by . This book was released on 1993 with total page 186 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Development of an Energy Storing Prosthetic Foot written by Puay Hwee Tan and published by . This book was released on 1994 with total page 260 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Energy Storage and Return Prosthetic Foot Design Using Selective Laser Sintering written by Brian James South and published by . This book was released on 2008 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Bulletin of Prosthetics Research written by and published by . This book was released on 1981 with total page 324 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Study of the Biomechanical Characteristics of the Flex Foot an Energy Storing Prosthetic Foot written by Petra Barnett and published by . This book was released on 1998 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:

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 Design and Evaluation of a Cantilever Beam type Prosthetic Foot for Indian Persons with Amputations written by Kathryn M. Olesnavage and published by . This book was released on 2014 with total page 97 pages. Available in PDF, EPUB and Kindle. Book excerpt: The goal of this work is to design a low cost, high performance prosthetic foot in collaboration with Bhagwan Mahaveer Viklang Sahayata Samiti (BMVSS), in Jaipur, India. In order to be adopted, the foot must cost less than $10 USD, be mass-manufacturable, and meet or exceed the performance of the Jaipur Foot, BMVSS' current prosthetic foot. This thesis investigates different metrics that are used to design and evaluate prosthetic feet and presents an analysis and evaluation of a solid ankle, cantilever beam - type prosthetic foot. Methods of comparing prosthetic feet in industry and in academia are discussed using a review of literature. These comparisons can be categorized into mechanical, metabolic, subjective, and gait analysis comparisons. The mechanical parameters are the most useful for designing a new prosthetic foot, as they are readily translated into engineering design requirements; however, these are the furthest removed from the performance of the foot. On the other end of the spectrum are metabolic and subjective parameters, which are useful in evaluating prosthetic feet because the objectives of minimizing energy expenditure and earning user approval are clear. Somewhere between these is gait analysis. The literature review reveals that not enough information is available to bridge these categories, that is, there is no consensus on how any particular mechanical parameter affects the subjective ranking of a prosthetic foot. Two mechanical parameters emerge as necessary, but not sufficient: the rollover shape and the energy storage and return capacity of a prosthetic foot. A simple model of a solid ankle, cantilever beam - type prosthetic foot is analyzed in the context of these two parameters. By applying beam bending theory and published gait analysis data, it is found that an unconstrained cantilever beam maximizes energy storage and return, but does not replicate a physiological roll-over shape well regardless of bending stiffness. Finite element analysis is used to find the roll-over shape and energy storage capacity from the same model when a mechanical constraint is added to prevent over deflection. The results show that for very compliant beams, the roll-over shape is nearly identical to the physiological rollover shape, but the energy storage capacity is low. For stiff beams, the opposite is true. Thus there is a trade-off between roll-over shape and energy storage capacity for cantilever beam type feet that fit this model. Further information is required to determine the relative importance of each of these parameters before an optimal bending stiffness can be found. A proof-of-concept prototype was built according to this model and tested in India at BMVSS. It was found that another parameter - perception of stability, which is perhaps dependent on the rate of forward progression of the center of pressure is equally important as, if not more than, the other parameters investigated here. Perception of stability increased with bending stiffness. The prototype foot received mixed feedback and has potential to be further refined. However, the solid ankle model is inappropriate for persons living in India, as it does not allow enough true dorsiflexion to permit squatting, an important activity that is done many times a day in the target demographic. Future work will use a similar method to design and optimize a prosthetic foot with a rotational ankle joint to allow this motion.

Download or read book Stiffness and Energy Storage Characteristics of Energy Storage and Return Prosthetic Feet written by Nicholas David Womac and published by . This book was released on 2017 with total page 76 pages. Available in PDF, EPUB and Kindle. Book excerpt: Prosthetists currently lack quantifiable measures to guide prosthesis prescriptions and must rely on experience and manufacturer recommendations. Studies have shown that stiffness and energy storage characteristics of prosthetic feet significantly influence amputee gait. Consequently, several studies have attempted measure these mechanical characteristics, but typically measure only a few orientations in a single plane. This study examined the stiffness and energy storage characteristics of several prostheses over normal gait orientations with the goal of improving prosthesis prescriptions. Feet from five different manufacturers were tested with twenty-five different combinations of foot style, stiffness category and heel wedge inclusion. Force-displacement data were collected at fifteen sagittal orientations and five coronal orientations, and were used to calculate stiffness and energy storage. Loading conditions at each sagittal orientation were determined using a representative amputee’s scaled walking data. Stiffness and energy storage were found to be highly non-linear in both the sagittal and coronal planes. Across all feet, stiffness was greatest near foot flat in the sagittal plane. Generally, stiffness decreased with greater heel, forefoot, medial and lateral loading orientations. Energy storage was greatest for forefoot loading and increased with medial or lateral loading orientations. As stiffness category increased within a foot style, stiffness increased and energy stored decreased. However, the recommended weight for a given foot was not linearly related to stiffness or energy storage. In addition, feet with similar manufacturer recommended weight ranges had varied energy storage over all orientations and varied stiffness over heel and foot flat loading orientations. Inclusion of heel wedges increased stiffness and decreased energy storage over heel and foot flat loading for the Vari-Flex with EVO foot, but not the Sierra foot. These results may help improve clinical prescriptions by providing prosthetists with quantitative measures to compare feet.

Download or read book Design of a Novel Mechatronic System to Test Prosthetic Feet Under Specific Walking Activity Loads and Evaluate Their Lower Leg Trajectory Error written by Heidi V. Peterson and published by . This book was released on 2021 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Lower limb amputees, numbered at more than 40 million globally, are challenged with limited mobility due to prosthetic devices that do not fully restore the functionalities of their biological limbs. While commercially available energy storage and return feet do restore some of the functionalities of a missing limb, the development and use of these prosthetic devices are limited by the current design, evaluation, and prescription processes. This is because the connection between the combined mechanical characteristics of a foot and user outcomes, such as mobility, comfort, and walking effort, is not fully understood. The lower leg trajectory error (LLTE) is a novel prosthetic foot performance metric that provides a quantitative connection between the mechanical characteristics of a foot and the expected gait of an amputee. Thus far, the LLTE value of a foot has only been calculated via simulation, which limits the practical use of the metric in prosthetic foot design, evaluation, and prescription. One way to systematically measure the LLTE value of a physical prosthetic foot would be through a mechanical bench test, but the capabilities of existing bench testing devices are insufficient due to limited degrees of actuation and reported accuracy. The purpose of this work was to design the Prosthetic Foot Testing Device (PFTD), a mechatronic testing device that could apply specific and uncoupled GRFs to any CoP on a foot and measure its deflection, through which it could measure the LLTE value and thus predict walking performance of any passive prosthetic foot. First, we determined high-level functional requirements of the PFTD, including the ranges of reference loads and prosthetic foot deflections as well as the LLTE measurement accuracy, such that the PFTD could meaningfully measure the full range of commercially available prosthetic feet. Second, we derived the relationships between the variables used to calculate the LLTE metric and those controlled or measured by the PFTD. Third, we used these relationships to design the PFTD and perform sensitivity analysis to ensure it could meaningfully and accurately measure the LLTE value of any passive prosthetic foot. In future work, the PFTD will be built, validated, and used to measure and compare the LLTE values of various prosthetic feet. The PFTD and theory presented herein may become a new tool in the prosthetics industry to systematically and amputee-independently measure and compare the performance of prosthetic devices using the LLTE value as a universal metric, which could ultimately improve the development and prescription processes of prostheses.

Download or read book Powered Prostheses written by Houman Dallali and published by Academic Press. This book was released on 2020-04-17 with total page 282 pages. Available in PDF, EPUB and Kindle. Book excerpt: Powered Prostheses: Design, Control, and Clinical Applications presents the state-of-the-art in design, control and application of assistive technologies used in rehabilitation, including powered prostheses used in lower and upper extremity amputees and orthosis used in the rehabilitation of various joint disorders. The progress made in this field over the last decade is so vast that any new researcher in this field will have to spend years digesting the main achievements and challenges that remain. This book provides a comprehensive vision of advances, along with the challenges that remain on the path to the development of true bionic technology. - Describes the latest assistive technologies that can help individuals deal with joint pain or limb loss - Presents a tangible and intuitive description of scientific achievements made - Highlights the existing technologies and devices that are available and used by amputees or patients with mobility limitations - Suggests solutions and new results that can further enhance assistive technologies

Download or read book Analysis and Design of Bearing Systems in Controlled Passive Energy Management CPEM Prosthetic Feet written by GREG. Esau and published by . This book was released on with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Core Topics in Foot and Ankle Surgery written by Andrew Robinson and published by Cambridge University Press. This book was released on 2018-04-19 with total page 438 pages. Available in PDF, EPUB and Kindle. Book excerpt: This concise guide offers an ideal overview of both the practical and theoretical aspects of foot and ankle surgery for trainees and junior consultants. Easy to read chapters cover all areas of surgery, from examination, imaging, and the biomechanics of the foot and ankle, to specific conditions including amputations and prostheses, deformities, arthritis, cavus and flat foot, sports injuries, Achilles tendon, benign and malignant tumors and heel pain. Fractures and dislocations of the ankle, hind-, mid- and forefoot are also covered, as are the foot in diabetes and pediatrics. Written by a team of international experts, the text is an accessible way to prepare for postgraduate examinations and manage patients successfully.

Download or read book The Influence of Prosthetic Foot Design and Walking Speed on Below knee Amputee Gait Mechanics written by Nicholas Phillip Fey and published by . This book was released on 2011 with total page 330 pages. Available in PDF, EPUB and Kindle. Book excerpt: Unilateral below-knee amputees commonly experience asymmetrical gait patterns and develop comorbidities in their intact (non-amputated) and residual (amputated) legs, with the mechanisms leading to these asymmetries and comorbidities being poorly understood. Prosthetic feet have been designed in an attempt to minimize walking asymmetries by utilizing elastic energy storage and return (ESAR) to help provide body support, forward propulsion and leg swing initiation. However, identifying the influence of walking speed and prosthetic foot stiffness on amputee gait mechanics is needed to develop evidence-based rationale for prosthetic foot selection and treatment of comorbidities. In this research, experimental and modeling studies were performed to identify the influence of walking speed and prosthetic foot stiffness on amputee walking mechanics. The results showed that when asymptomatic and relatively new amputees walk using clinically prescribed prosthetic feet across a wide range of speeds, loading asymmetries exist between the intact and residual knees. However, knee intersegmental joint force and moment quantities in both legs were not higher compared to non-amputees, suggesting that increased knee loads leading to joint disorders may develop in response to prolonged prosthesis usage or the onset of joint pathology over time. In addition, the results showed that decreasing ESAR foot stiffness can increase prosthesis range of motion, mid-stance energy storage, and late-stance energy return. However, the prosthetic foot contributions to forward propulsion and swing initiation were limited due to muscle compensations needed to provide body support and forward propulsion in the absence of residual leg ankle muscles. A study was also performed that integrated design optimization with forward dynamics simulations of amputee walking to identify the optimal prosthetic foot stiffness that minimized metabolic cost and intact knee joint forces. The optimal stiffness profile stiffened the toe and mid-foot while making the ankle less stiff, which decreased the intact knee joint force during mid-stance while reducing the overall metabolic cost of walking. These studies have provided new insight into the relationships between prosthetic foot stiffness and amputee walking mechanics, which provides biomechanics-based rationale for prosthetic foot prescription that can lead to improved amputee mobility and overall quality of life.