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Dissertations / Theses on the topic 'Ankle-foot prosthesis'

Author: Grafiati

Published: 4 June 2021

Last updated: 5 February 2022

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1

Au, Samuel Kwok-Wai. "Powered ankle-foot prosthesis for the improvement of amputee walking economy." Thesis, Massachusetts Institute of Technology, 2007. http://hdl.handle.net/1721.1/40949.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2007.<br>Includes bibliographical references (p. 103-108).<br>The human ankle provides a significant amount of net positive work during the stance period of walking, especially at moderate to fast walking speeds. On the contrary, conventional ankle-foot prostheses are completely passive during stance, and consequently, cannot provide net positive work. Clinical studies indicate that transtibial amputees using conventional prostheses exhibit higher gait metabolic rates as compared to intact individuals. Res

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2

Rogers, Emily S. M. Massachusetts Institute of Technology. "Neurally-controlled ankle-foot prosthesis with non-backdrivable transmission for rock climbing augmentation." Thesis, Massachusetts Institute of Technology, 2019. https://hdl.handle.net/1721.1/121861.

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Thesis: S.M., Massachusetts Institute of Technology, Department of Mechanical Engineering, 2019<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (pages 87-88).<br>This thesis presents the design and evaluation of a neurally-controlled ankle-foot prosthesis optimized to enhance rock climbing ability in persons with transtibial amputation. The bionic rock climbing prosthesis restores biologic performance of the ankle-foot complex. The user volitionally controls the positions of both the prosthetic ankle and subtalar joints via input from electromyography surface el

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3

Martinez, Villalpando Ernesto Carlos. "Estimation of ground reaction force and zero moment point on a powered ankle-foot prosthesis." Thesis, Massachusetts Institute of Technology, 2006. http://hdl.handle.net/1721.1/37271.

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Thesis (S.M.)--Massachusetts Institute of Technology, School of Architecture and Planning, Program in Media Arts and Sciences, 2006.<br>Includes bibliographical references (leaves 89-97).<br>Commercially available ankle-foot prostheses are passive when in contact with the ground surface, and thus, their mechanical properties remain fixed across different terrains and walking speeds. The passive nature of these prostheses causes many problems for lower extremity amputees, such as a lack of adequate balance control during standing and walking. The ground reaction force (GRF) and the zero moment

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4

Schlafly, Millicent. "Design and Testing of a Passive Prosthetic Ankle Foot Optimized to Mimic an Able-Bodied Gait." Scholar Commons, 2018. https://scholarcommons.usf.edu/etd/7710.

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Currently there are nearly 2 million people living with limb loss in the United States [1]. Many of these individuals are either transtibial (below knee) or transfemoral (above knee) amputees and require an ankle-foot prosthesis for basic mobility. While there are an abundance of options available for individuals who require an ankle-foot prosthesis, these options fail to mimic an intact ankle when it comes to key evaluation criteria such as range of motion, push-off force, and roll over shape. The roll over shape is created by plotting the center of pressure during a step in a shank-based coo

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5

Struckovs, Vasilijs. "Biomechanical adaptations involved in ramp descent: Impact of microprocessor-controlled ankle-foot prothesis. Kinetic and kinematic responses to using microprocessor-controlled ankle-foot prosthesis in unilateral trans-tibial amputees during ramp descent." Thesis, University of Bradford, 2017. http://hdl.handle.net/10454/17214.

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Ramp descent is a demanding task for trans-tibial amputees, due to the difficulty in controlling body weight progression over the prosthetic foot. A deeper understanding of the impact of foot function on ramp descent biomechanics is required to make recommendations for rehabilitation programs and prosthetic developments for lower-limb amputees. The thesis aim was to determine the biomechanical adaptations made by active unilateral trans-tibial amputees (TT) using a microprocessor-controlled ankle-foot prosthesis in active (MC-AF) compared to non-active mode (nonMC-AF) or elastically articulate

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6

De, Asha Alan R. "Biomechanical adaptations of lower-limb amputee-gait: Effects of the echelon hydraulically damped foot. Segmental kinetic and kinematic responses to hydraulically damped prosthetic ankle-foot components in unilateral, trans-tibial amputees." Thesis, University of Bradford, 2013. http://hdl.handle.net/10454/7271.

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The aim of this thesis was to determine the biomechanical adaptations made by active unilateral trans-tibial amputees when they used a prosthesis incorporating a hydraulically-damped, articulating ankle-foot device compared to non-hydraulically attached devices. Kinematic and kinetic data were recorded while participants ambulated over a flat and level surface at their customary walking speeds and at speeds they perceived to be faster and slower using the hydraulic device and their habitual foot. Use of the hydraulic device resulted in increases in self-selected walking speeds with a simultan

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7

De, Asha Alan Richard. "Biomechanical adaptations of lower-limb amputee-gait : effects of the echelon hydraulically damped foot : segmental kinetic and kinematic responses to hydraulically damped prosthetic ankle-foot components in unilateral, trans-tibial amputees." Thesis, University of Bradford, 2013. http://hdl.handle.net/10454/7271.

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The aim of this thesis was to determine the biomechanical adaptations made by active unilateral trans-tibial amputees when they used a prosthesis incorporating a hydraulically-damped, articulating ankle-foot device compared to non-hydraulically attached devices. Kinematic and kinetic data were recorded while participants ambulated over a flat and level surface at their customary walking speeds and at speeds they perceived to be faster and slower using the hydraulic device and their habitual foot. Use of the hydraulic device resulted in increases in self-selected walking speeds with a simultane

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8

Eslamy, Mahdy Verfasser], Andre [Akademischer Betreuer] Seyfarth, and Stephan [Akademischer Betreuer] [Rinderknecht. "Emulation of Ankle Function for Different Gaits through Active Foot Prosthesis: Actuation Concepts, Control and Experiments / Mahdy Eslamy. Betreuer: Andre Seyfarth ; Stephan Rinderknecht." Darmstadt : Universitäts- und Landesbibliothek Darmstadt, 2014. http://d-nb.info/1110903294/34.

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9

Eslamy, Mahdy [Verfasser], Andre Akademischer Betreuer] Seyfarth, and Stephan [Akademischer Betreuer] [Rinderknecht. "Emulation of Ankle Function for Different Gaits through Active Foot Prosthesis: Actuation Concepts, Control and Experiments / Mahdy Eslamy. Betreuer: Andre Seyfarth ; Stephan Rinderknecht." Darmstadt : Universitäts- und Landesbibliothek Darmstadt, 2014. http://nbn-resolving.de/urn:nbn:de:tuda-tuprints-42021.

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10

Eilenberg, Michael Frederick. "A neuromuscular-model based control strategy for powered ankle-foot prostheses." Thesis, Massachusetts Institute of Technology, 2009. http://hdl.handle.net/1721.1/58192.

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Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2009.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (p. 89-90).<br>In the development of a powered ankle-foot prosthesis, it is desirable to provide the prosthesis with the ability to exhibit human-like dynamics. A simple method for achieving this goal involves trajectory tracking, where a specific target torque trajectory is known, and the controller issues commands to follow the trajectory as closely as possible. However, without a methodology to update the desired traject

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11

Palmer, Jasmin Elena. "Design and development of mechanical metatarsophalangeal joint for powered ankle-foot prostheses." Thesis, Massachusetts Institute of Technology, 2019. https://hdl.handle.net/1721.1/123272.

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Thesis: S.B., Massachusetts Institute of Technology, Department of Mechanical Engineering, 2019<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (page 46).<br>This thesis seeks to explore passive designs for a mechanical alternative to the metatarsophalangeal (MTP) joint, a critical anatomical component in human feet which allows for various types of anatomical motion. Our goal is to design a system that will act as a platform to test a proof of concept for a passive ankle-foot prosthesis with an MTP joint, but can also be adapted to use an actuated joint in the

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12

Kim, Myunghee. "Ankle Controller Design For Robotic Ankle-Foot Prostheses to Reduce Balance-Related Effort During Walking Using a Dynamic Walking Approach." Research Showcase @ CMU, 2015. http://repository.cmu.edu/dissertations/667.

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The goal of my research is to develop ankle-foot prosthesis controllers that reduce balance-related effort during walking. Although great progress has been made in ankle foot prostheses, individuals with below knee amputation still report difficulty with balance.

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13

Yen, Cai Yao, and 顏才堯. "Development and Verification of Foot Pressure and Joint Angle Feedback Bionic Ankle Prosthesis." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/30782067980672813921.

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碩士<br>長庚大學<br>機械工程學系<br>100<br>Below knee amputation patients lost their leg dorsiflexion and plantar flexion functions because of their major muscles (e.g. the tibialis anterior muscle, gastrocnemius muscle, soleus muscle, etc.) and lower leg bones (tibia and fibula) had been amputated. These patients can’t have dorsiflexion, plantar flexion and driving force actions automatically while wearing traditional prostheses and walking. Hence, patients with below knee amputation need more energy consumption for walking because they have to swin their remaining limb instead of push off motion. Below

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14

Eslamy, Mahdy. "Emulation of Ankle Function for Different Gaits through Active Foot Prosthesis: Actuation Concepts, Control and Experiments." Phd thesis, 2014. https://tuprints.ulb.tu-darmstadt.de/4202/1/PhDEslamy.pdf.

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A main effort has been devoted in this thesis to consider the effects of the actuator components (i.e. springs, dampers and motors) and their configuration (i.e. the way they are assembled) in power and energy requirement of powered foot prostheses. It has been investigated which actuation mechanism would have the least requirements to perform a certain human gait (e.g. walking, running, ascending or descending the stairs). This thesis shows that the components of the robotic foot and their configurations are important design factors. This information is fundamental for building mechanic

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15

Struchkov, Vasily, and John G. Buckley. "Biomechanics of ramp descent in unilateral trans-tibial amputees: Comparison of a microprocessor controlled foot with conventional ankle–foot mechanisms." 2015. http://hdl.handle.net/10454/8228.

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yes<br>Background Walking down slopes and/or over uneven terrain is problematic for unilateral trans-tibial amputees. Accordingly, ‘ankle’ devices have been added to some dynamic-response feet. This study determined whether use of a microprocessor controlled passive-articulating hydraulic ankle–foot device improved the gait biomechanics of ramp descent in comparison to conventional ankle–foot mechanisms. Methods Nine active unilateral trans-tibial amputees repeatedly walked down a 5° ramp, using a hydraulic ankle–foot with microprocessor active or inactive or using a comparable foot w

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16

De, Asha Alan R., Louise Johnson, R. Munjal, J. Kulkarni, and John G. Buckley. "Attenuation of centre-of-pressure trajectory fluctuations under the prosthetic foot when using an articulating hydraulic ankle attachment compared to fixed attachment." 2012. http://hdl.handle.net/10454/7488.

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yes<br>Background Disruptions to the progress of the centre-of-pressure trajectory beneath prosthetic feet have been reported previously. These disruptions reflect how body weight is transferred over the prosthetic limb and are governed by the compliance of the prosthetic foot device and its ability to simulate ankle function. This study investigated whether using an articulating hydraulic ankle attachment attenuates centre-of-pressure trajectory fluctuations under the prosthetic foot compared to a fixed attachment. Methods Twenty active unilateral trans-tibial amputees completed walk

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17

"Anticipatory Muscle Responses for Transitioning Between Rigid Surface and Surfaces of Different Compliance: Towards Smart Ankle-foot Prostheses." Master's thesis, 2019. http://hdl.handle.net/2286/R.I.53887.

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abstract: Locomotion is of prime importance in enabling human beings to effectively respond in space and time to meet different needs. Approximately 2 million Americans live with an amputation with most of those amputations being of the lower limbs. To advance current state-of-the-art lower limb prosthetic devices, it is necessary to adapt performance at a level of intelligence seen in human walking. As such, this thesis focuses on the mechanisms involved during human walking, while transitioning from rigid to compliant surfaces such as from pavement to sand, grass or granular media. Ut

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18

De, Asha Alan R., R. Munjal, J. Kulkarni, and John G. Buckley. "Impact on the biomechanics of overground gait of using an ‘Echelon’ hydraulic ankle–foot device in unilateral trans-tibial and trans-femoral amputees." 2014. http://hdl.handle.net/10454/8223.

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Yes<br>If a prosthetic foot creates resistance to forwards shank rotation as it deforms during loading, it will exert a braking effect on centre of mass progression. The present study determines whether the centre of mass braking effect exerted by an amputee's habitual rigid ‘ankle’ foot was reduced when they switched to using an ‘Echelon’ hydraulic ankle–foot device. Nineteen lower limb amputees (eight trans-femoral, eleven trans-tibial) walked overground using their habitual dynamic-response foot with rigid ‘ankle’ or ‘Echelon’ hydraulic ankle–foot device. Analysis determined changes in h

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19

Askew, G. N., L. A. McFarlane, A. E. Minetti, and John G. Buckley. "Energy cost of ambulation in trans-tibial amputees using a dynamic-response foot with hydraulic versus rigid 'ankle': insights from body centre of mass dynamics." 2019. http://hdl.handle.net/10454/16902.

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Yes<br>Background Previous research has shown that use of a dynamic-response prosthetic foot (DRF) that incorporates a small passive hydraulic ankle device (hyA-F), provides certain biomechanical benefits over using a DRF that has no ankle mechanism (rigA-F). This study investigated whether use of a hyA-F in unilateral trans-tibial amputees (UTA) additionally provides metabolic energy expenditure savings and increases the symmetry in walking kinematics, compared to rigA-F. Methods Nine active UTA completed treadmill walking trials at zero gradient (at 0.8, 1.0, 1.2, 1.4, and 1.6 of custom

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