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Evolution of an Adaptable Prosthetic Foot Design for Normalization of Biomechanics During Community Participation

Award Information
Agency: Department of Health and Human Services
Branch: National Institutes of Health
Contract: 2R42HD093476-02A1
Agency Tracking Number: R42HD093476
Amount: $449,359.00
Phase: Phase II
Program: STTR
Solicitation Topic Code: NICHD
Solicitation Number: PA18-576
Solicitation Year: 2018
Award Year: 2019
Award Start Date (Proposal Award Date): 2019-04-08
Award End Date (Contract End Date): 2021-03-31
Small Business Information
15441 SCIOTO DARBY RD, Mount Sterling, OH, 43143-9036
DUNS: 004280723
HUBZone Owned: N
Woman Owned: N
Socially and Economically Disadvantaged: N
Principal Investigator
 (740) 869-3377
Business Contact
Phone: (740) 869-3377
Research Institution
SEATTLE, WA, 98195-9472
 Nonprofit college or university
Evolution of an Adaptable Prosthetic Foot Design for Normalization ofBiomechanics During Community Participation Summary AbstractThe vision of this project is to improve the functional physical mobility of people with lower extremity amputations especially on uneven groundside slopes or when foot placement varies from side to sidePeople with amputations will be enabled to confidently participate in a wider range of activitiesThis will enhance their personal satisfaction thereby improving their quality of lifePeople using prostheses currently have significant mobility disability and a high incidence of fallspartly because commercially available prosthetic feet are unable to meet their day to day needsCurrent prosthetic feet are designed and optimized for level groundforward walkingConsequentlyprosthetists align the prosthetic foot to a single preferred position for this activityDuring everyday activitiesincluding quiet standingfeet are placed in different positionsWhen the prosthesis user ambulates around their communitythey are faced with many obstacles that do not conform to the level ground forward walking paradigmWhen people engage in tasks while they walkor if they have poor limb functionthe placement of the foot becomes less controlledThus there is a need to fundamentally rethink prosthetic foot design to restore adaptability to body ground positionThe innovative approach pursued in this project is to develop the Ankentro which restores spontaneous adaptabilityallowing the prosthesis user to ambulate over various terrainsThe novelspontaneously adaptable foot allows a range of alignments relative to the ground to accommodate a variety of postures and gaitThis is achieved by specific linkages that respond to environmental forces with predictable resultsmoving the center of rotation so that it aligns to the resultant forcesRather than incorporating compliant surfaceswhich can cause postural and gait instability and higher energy costthe Adaptable Foot restores adaptability without sacrificing stabilityDuring the Phase II effortthe project team will develop a new prosthetic foot called the Ankentro that includes the linkage system resulting from the Phase I milestone achievements and then use that refined prototype for extended community use and evaluationAnkentro development includes optimizing the linkage mechanismdeveloping a new toe and heel springrefining foot covering dimensionsand validating the design with standardized mechanical testsThe clinical evaluations include controlled laboratory tests that challenge side to side adaptabilityin parallel with community trialsQuantitative and qualitative outcomes will be generated to evaluate the clinical benefit of the Ankentro Project Narrative Currently available prosthetic feet are generally designed by manufacturers and fit aligned by prosthetists to be optimal for level ground walking and are unable to adapt to various terrains including sloped or uneven ground due to limited ankle range of motionThis lack of adaptability can lead to severe mobility impairment for people using prostheses because of unstable contact with the groundresulting in a lack of confidence in their prosthetic limb and ultimately reducing their community involvementWe seek to restore confidence and functionality by creating a prosthetic foot that can spontaneously adapt to the ground surface geometry and uncertain placement of the foot thereby improving community participation and quality of life

* Information listed above is at the time of submission. *

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