Computational Tools and Experimental Methods for the Development of Passive Prosthetic Feet

Morgan, Ben

doi:10.23889/SUthesis.62297

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Computational Tools and Experimental Methods for the Development of Passive Prosthetic Feet / Ben Morgan

Swansea University Author: Ben Morgan

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Copyright: The author, Benjamin W. Morgan, 2022. Released under the terms of a Creative Commons Attribution-Non-Commercial-Share Alike (CC-BY-NC-SA) License. Third party content is excluded for use under the license terms.
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DOI (Published version): 10.23889/SUthesis.62297

Abstract

Modern prosthetic foot designs are incredibly diverse in comparison to what was o↵ered to amputees at the turn of the millennium. Powered ankles can supply natural levels of joint torque, whilst passive feet continue to optimise for kinematic goals. However, most passive feet still do not solve the...

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Published:	Swansea 2022
Institution:	Swansea University
Degree level:	Doctoral
Degree name:	EngD
Supervisor:	Ransing, Rajesh S. ; Owen, Nick J.
URI:	https://cronfa.swan.ac.uk/Record/cronfa62297
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first_indexed	2023-01-10T16:23:29Z
last_indexed	2023-01-16T17:31:05Z
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spelling	2023-01-16T15:42:43.6317983 v2 62297 2023-01-10 Computational Tools and Experimental Methods for the Development of Passive Prosthetic Feet d173b9887192b836956b16035581437c Ben Morgan Ben Morgan true false 2023-01-10 MECH Modern prosthetic foot designs are incredibly diverse in comparison to what was o↵ered to amputees at the turn of the millennium. Powered ankles can supply natural levels of joint torque, whilst passive feet continue to optimise for kinematic goals. However, most passive feet still do not solve the issue of unhealthy loads, and an argument can be made that optimisation methods have neglected the less active and elderly amputee. This thesis creates a framework for a novel approach to prosthetic foot optimisation by focusing on the transitionary motor tasks of gait initiation and termination.An advanced FEA model has been created in ANSYS® using boundary con-ditions derived from an ISO testing standard that replicates stance phase loading. This model can output standard results found in the literature and goes beyond by parameterising the roll-over shape within the software using custom APDL code. Extensive contact exploration and an experimental study have ensured the robustness of the model. Subject force and kinematic data can be used for speciﬁc boundary conditions, which would allow for easy adaptation to the transitionary motor tasks.This FEA model has been used in the development of prosthetic experiment tool, which can exchange helical springs to assess e↵ects of small changes in sti↵-ness on gait metrics. A rigorous design methodology was employed for all compo-nents, including parametric design studies, response surface optimisation, and ISO level calculations. The design has been manufactured into a working prototype and is ready for clinical trials to determine its eﬃcacy.The conclusion of this framework is in the development of an experimental method to collect subject data for use in the models. A pilot study uncovered reliable protocols, which were then veriﬁed with ANOVA statistics. Proportional ratios were deﬁned as additions to metric peak analyses already found in the liter-ature. These tools are ready for deployment in full clinical trials with amputees, so that a new prosthetic optimisation pathway can be discovered for the beneﬁt of less active or elderly amputees. E-Thesis Swansea Prosthetic, engineering, computational, modelling, biomechanics 21 12 2022 2022-12-21 10.23889/SUthesis.62297 ORCiD identifier: https://orcid.org/0000-0001-6538-4568 COLLEGE NANME Mechanical Engineering COLLEGE CODE MECH Swansea University Ransing, Rajesh S. ; Owen, Nick J. Doctoral EngD WEFO (Welsh European Funding Office) 2023-01-16T15:42:43.6317983 2023-01-10T16:16:05.9133811 Faculty of Science and Engineering School of Engineering and Applied Sciences - Uncategorised Ben Morgan 1 62297__26241__e658c0ae06c642919b3020a20b5f14b0.pdf Morgan_Benjamin_W_EngD_Thesis_Final_Redacted_Signature.pdf 2023-01-10T16:28:49.2407539 Output 47704062 application/pdf E-Thesis – open access true Copyright: The author, Benjamin W. Morgan, 2022. Released under the terms of a Creative Commons Attribution-Non-Commercial-Share Alike (CC-BY-NC-SA) License. Third party content is excluded for use under the license terms. true eng https://creativecommons.org/licenses/by-nc-sa/4.0/
title	Computational Tools and Experimental Methods for the Development of Passive Prosthetic Feet
spellingShingle	Computational Tools and Experimental Methods for the Development of Passive Prosthetic Feet Ben Morgan
title_short	Computational Tools and Experimental Methods for the Development of Passive Prosthetic Feet
title_full	Computational Tools and Experimental Methods for the Development of Passive Prosthetic Feet
title_fullStr	Computational Tools and Experimental Methods for the Development of Passive Prosthetic Feet
title_full_unstemmed	Computational Tools and Experimental Methods for the Development of Passive Prosthetic Feet
title_sort	Computational Tools and Experimental Methods for the Development of Passive Prosthetic Feet
author_id_str_mv	d173b9887192b836956b16035581437c
author_id_fullname_str_mv	d173b9887192b836956b16035581437c_***_Ben Morgan
author	Ben Morgan
author2	Ben Morgan
format	E-Thesis
publishDate	2022
institution	Swansea University
doi_str_mv	10.23889/SUthesis.62297
college_str	Faculty of Science and Engineering
hierarchytype
hierarchy_top_id	facultyofscienceandengineering
hierarchy_top_title	Faculty of Science and Engineering
hierarchy_parent_id	facultyofscienceandengineering
hierarchy_parent_title	Faculty of Science and Engineering
department_str	School of Engineering and Applied Sciences - Uncategorised{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Engineering and Applied Sciences - Uncategorised
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description	Modern prosthetic foot designs are incredibly diverse in comparison to what was o↵ered to amputees at the turn of the millennium. Powered ankles can supply natural levels of joint torque, whilst passive feet continue to optimise for kinematic goals. However, most passive feet still do not solve the issue of unhealthy loads, and an argument can be made that optimisation methods have neglected the less active and elderly amputee. This thesis creates a framework for a novel approach to prosthetic foot optimisation by focusing on the transitionary motor tasks of gait initiation and termination.An advanced FEA model has been created in ANSYS® using boundary con-ditions derived from an ISO testing standard that replicates stance phase loading. This model can output standard results found in the literature and goes beyond by parameterising the roll-over shape within the software using custom APDL code. Extensive contact exploration and an experimental study have ensured the robustness of the model. Subject force and kinematic data can be used for speciﬁc boundary conditions, which would allow for easy adaptation to the transitionary motor tasks.This FEA model has been used in the development of prosthetic experiment tool, which can exchange helical springs to assess e↵ects of small changes in sti↵-ness on gait metrics. A rigorous design methodology was employed for all compo-nents, including parametric design studies, response surface optimisation, and ISO level calculations. The design has been manufactured into a working prototype and is ready for clinical trials to determine its eﬃcacy.The conclusion of this framework is in the development of an experimental method to collect subject data for use in the models. A pilot study uncovered reliable protocols, which were then veriﬁed with ANOVA statistics. Proportional ratios were deﬁned as additions to metric peak analyses already found in the liter-ature. These tools are ready for deployment in full clinical trials with amputees, so that a new prosthetic optimisation pathway can be discovered for the beneﬁt of less active or elderly amputees.
published_date	2022-12-21T04:21:48Z
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score	11.016258

Computational Tools and Experimental Methods for the Development of Passive Prosthetic Feet / Ben Morgan

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