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A pressure and shear sensor system for stress measurement at lower limb residuum/socket interface

A pressure and shear sensor system for stress measurement at lower limb residuum/socket interface
A pressure and shear sensor system for stress measurement at lower limb residuum/socket interface
A sensor system for measurement of pressure and shear at the lower limb residuum/socket interface is described. The system comprises of a flexible sensor unit and a data acquisition unit with wireless data transmission capability. Static and dynamic performance of the sensor system was characterised using a mechanical test machine. The static calibration results suggest that the developed sensor system presents high linearity (linearity error ~ 3.8%) and resolution (0.9kpa for pressure and 0.2kpa for shear). Dynamic characterisation of the sensor system shows hysteresis error of approximately 15% for pressure and 8% for shear. Subsequently, a pilot amputee walking test was conducted. Three sensors were placed at the residuum/socket interface of a knee disarticulation amputee and simultaneous measurements were obtained during pilot amputee walking test. The pressure and shear peak values as well as their temporal profiles are presented and discussed.
In particular, peak pressure and shear of approximately 58kPa and 27kPa, respectively, were recorded. Their temporal profiles also provide dynamic coupling information at this critical residuum/socket interface. These preliminary amputee test results suggest strong potential of the developed sensor system for exploitation as an assistive technology to facilitate socket design, socket fit and effective monitoring of lower limb residuum health.
pressure and shear sensor, residuum/socket interface, lower-limb amputees
1350-4533
695-700
Laszczak, Piotr
ea4976f2-006b-4be6-b49a-9d4a88c1a4bf
Mcgrath, Michael
32b5ce9d-eada-4edb-9c2e-ebc4d05142e9
Tang, Jing
b4b9a22c-fd6d-427a-9ab1-51184c1d2a2c
Gao, Jianliang
84cfd2ed-c48c-4d9f-9e7c-49afc7cc6e4d
Jiang, Liudi
374f2414-51f0-418f-a316-e7db0d6dc4d1
Bader, Dan
9884d4f6-2607-4d48-bf0c-62bdcc0d1dbf
Moser, David
09874cab-348f-47f9-b018-1c2875d16998
Zahedi, S.
5b9f308c-b703-4a7a-a85a-03311c3419a1
Laszczak, Piotr
ea4976f2-006b-4be6-b49a-9d4a88c1a4bf
Mcgrath, Michael
32b5ce9d-eada-4edb-9c2e-ebc4d05142e9
Tang, Jing
b4b9a22c-fd6d-427a-9ab1-51184c1d2a2c
Gao, Jianliang
84cfd2ed-c48c-4d9f-9e7c-49afc7cc6e4d
Jiang, Liudi
374f2414-51f0-418f-a316-e7db0d6dc4d1
Bader, Dan
9884d4f6-2607-4d48-bf0c-62bdcc0d1dbf
Moser, David
09874cab-348f-47f9-b018-1c2875d16998
Zahedi, S.
5b9f308c-b703-4a7a-a85a-03311c3419a1

Laszczak, Piotr, Mcgrath, Michael, Tang, Jing, Gao, Jianliang, Jiang, Liudi, Bader, Dan, Moser, David and Zahedi, S. (2016) A pressure and shear sensor system for stress measurement at lower limb residuum/socket interface. Medical Engineering & Physics, 38 (7), 695-700. (doi:10.1016/j.medengphy.2016.04.007). (PMID:27118308)

Record type: Article

Abstract

A sensor system for measurement of pressure and shear at the lower limb residuum/socket interface is described. The system comprises of a flexible sensor unit and a data acquisition unit with wireless data transmission capability. Static and dynamic performance of the sensor system was characterised using a mechanical test machine. The static calibration results suggest that the developed sensor system presents high linearity (linearity error ~ 3.8%) and resolution (0.9kpa for pressure and 0.2kpa for shear). Dynamic characterisation of the sensor system shows hysteresis error of approximately 15% for pressure and 8% for shear. Subsequently, a pilot amputee walking test was conducted. Three sensors were placed at the residuum/socket interface of a knee disarticulation amputee and simultaneous measurements were obtained during pilot amputee walking test. The pressure and shear peak values as well as their temporal profiles are presented and discussed.
In particular, peak pressure and shear of approximately 58kPa and 27kPa, respectively, were recorded. Their temporal profiles also provide dynamic coupling information at this critical residuum/socket interface. These preliminary amputee test results suggest strong potential of the developed sensor system for exploitation as an assistive technology to facilitate socket design, socket fit and effective monitoring of lower limb residuum health.

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Manuscript - accepted version.pdf - Accepted Manuscript
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More information

Accepted/In Press date: 3 April 2016
e-pub ahead of print date: 23 April 2016
Published date: July 2016
Keywords: pressure and shear sensor, residuum/socket interface, lower-limb amputees
Organisations: Faculty of Health Sciences, Engineering Mats & Surface Engineerg Gp

Identifiers

Local EPrints ID: 391352
URI: http://eprints.soton.ac.uk/id/eprint/391352
ISSN: 1350-4533
PURE UUID: db73001a-4e06-4ff4-8b5f-c9f114bf41b1
ORCID for Jing Tang: ORCID iD orcid.org/0000-0003-3359-5891
ORCID for Liudi Jiang: ORCID iD orcid.org/0000-0002-3400-825X
ORCID for Dan Bader: ORCID iD orcid.org/0000-0002-1208-3507

Catalogue record

Date deposited: 12 Apr 2016 08:54
Last modified: 26 Nov 2021 05:42

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Contributors

Author: Piotr Laszczak
Author: Michael Mcgrath
Author: Jing Tang ORCID iD
Author: Jianliang Gao
Author: Liudi Jiang ORCID iD
Author: Dan Bader ORCID iD
Author: David Moser
Author: S. Zahedi

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