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Development and validation of a 3D-printed interfacial stress sensor for prosthetic applications

Development and validation of a 3D-printed interfacial stress sensor for prosthetic applications
Development and validation of a 3D-printed interfacial stress sensor for prosthetic applications
A novel capacitance-based sensor designed for monitoring mechanical stresses at the stump–socket interface of lower-limb amputees is described. It provides practical means of measuring pressure and shear stresses simultaneously. In particular, it comprises of a flexible frame (20 mm × 20 mm), with thickness of 4 mm. By employing rapid prototyping technology in its fabrication, it offers a low-cost and versatile solution, with capability of adopting bespoke shapes of lower-limb residua. The sensor was first analysed using finite element analysis (FEA) and then evaluated using lab-based electromechanical tests. The results validate that the sensor is capable of monitoring both pressure and shear at stresses up to 350 kPa and 80 kPa, respectively. A post-signal processing model is developed to induce pressure and shear stresses, respectively. The effective separation of pressure and shear signals can be potentially advantageous for sensor calibration in clinical applications. The sensor also demonstrates high linearity (approx. 5–8%) and high pressure (approx. 1.3 kPa) and shear (approx. 0.6 kPa) stress resolution performance. Accordingly, the sensor offers the potential for exploitation as an assistive tool to both evaluate prosthetic socket fitting in clinical settings and alert amputees in home settings of excessive loading at the stump–socket interface, effectively preventing stump tissue breakdown at an early stage.
interfacial sensors, stump–socket interface, lower-limb amputees, stump ulcers
1350-4533
132-137
Laszczak, Piotr
da02733e-0d18-4d14-bc54-af80ee97d2fb
Jiang, Liudi
374f2414-51f0-418f-a316-e7db0d6dc4d1
Bader, Dan L.
9884d4f6-2607-4d48-bf0c-62bdcc0d1dbf
Moser, David
09874cab-348f-47f9-b018-1c2875d16998
Zahedi, S.
5b9f308c-b703-4a7a-a85a-03311c3419a1
Laszczak, Piotr
da02733e-0d18-4d14-bc54-af80ee97d2fb
Jiang, Liudi
374f2414-51f0-418f-a316-e7db0d6dc4d1
Bader, Dan L.
9884d4f6-2607-4d48-bf0c-62bdcc0d1dbf
Moser, David
09874cab-348f-47f9-b018-1c2875d16998
Zahedi, S.
5b9f308c-b703-4a7a-a85a-03311c3419a1

Laszczak, Piotr, Jiang, Liudi, Bader, Dan L., Moser, David and Zahedi, S. (2015) Development and validation of a 3D-printed interfacial stress sensor for prosthetic applications. Medical Engineering & Physics, 37 (1), 132-137. (doi:10.1016/j.medengphy.2014.10.002).

Record type: Article

Abstract

A novel capacitance-based sensor designed for monitoring mechanical stresses at the stump–socket interface of lower-limb amputees is described. It provides practical means of measuring pressure and shear stresses simultaneously. In particular, it comprises of a flexible frame (20 mm × 20 mm), with thickness of 4 mm. By employing rapid prototyping technology in its fabrication, it offers a low-cost and versatile solution, with capability of adopting bespoke shapes of lower-limb residua. The sensor was first analysed using finite element analysis (FEA) and then evaluated using lab-based electromechanical tests. The results validate that the sensor is capable of monitoring both pressure and shear at stresses up to 350 kPa and 80 kPa, respectively. A post-signal processing model is developed to induce pressure and shear stresses, respectively. The effective separation of pressure and shear signals can be potentially advantageous for sensor calibration in clinical applications. The sensor also demonstrates high linearity (approx. 5–8%) and high pressure (approx. 1.3 kPa) and shear (approx. 0.6 kPa) stress resolution performance. Accordingly, the sensor offers the potential for exploitation as an assistive tool to both evaluate prosthetic socket fitting in clinical settings and alert amputees in home settings of excessive loading at the stump–socket interface, effectively preventing stump tissue breakdown at an early stage.

Full text not available from this repository.

More information

Published date: January 2015
Keywords: interfacial sensors, stump–socket interface, lower-limb amputees, stump ulcers
Organisations: Engineering Science Unit

Identifiers

Local EPrints ID: 373344
URI: https://eprints.soton.ac.uk/id/eprint/373344
ISSN: 1350-4533
PURE UUID: 3ce69d65-5e8c-477c-94d8-54548d0e8b3e
ORCID for Liudi Jiang: ORCID iD orcid.org/0000-0002-3400-825X
ORCID for Dan L. Bader: ORCID iD orcid.org/0000-0002-1208-3507

Catalogue record

Date deposited: 15 Jan 2015 16:36
Last modified: 06 Jun 2018 12:41

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