Lower limb amputation causes a loss of motor and proprioceptive abilities in affected individuals. Different prostheses have been created to compensate for this deficit. However, most of these devices are passive and provide no sensory feedback to the amputee. Several solutions have been proposed to restore different typologies of sensation, driven by mechanical information obtained through sensors positioned on the anatomical district of interest, with specific limitations. This paper presents the mechanical and thermal characterization of a novel 3D-printed elastomeric strain sensor filled with liquid metal. It is designed to measure the strain on the cosmetic cover of a trans-tibial prosthesis to provide information to a feedback system. Static and dynamic tests were performed on the sensor, providing a graduation curve with satisfactory sensitivity, repeatability, linearity, and no signal attenuation over the 1 – 10 Hz frequency range. Thermal tests demonstrated an increase in the electrical resistance of the sensor up to 2.5% in the temperature range of 20 – 40 °C.

A 3D printed elastomeric strain sensor with mechanical and thermal characterization for Restoring Proprioception in Lower Limb Amputees / CASTELLI GATTINARA DI ZUBIENA, Francesco; Paolucci, Matteo; D’Alvia, Livio; DEL PRETE, Zaccaria; Palermo, Eduardo. - In: IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT. - ISSN 0018-9456. - (2024).

A 3D printed elastomeric strain sensor with mechanical and thermal characterization for Restoring Proprioception in Lower Limb Amputees

Francesco Castelli Gattinara Di Zubiena
Primo
;
Livio D’Alvia;Zaccaria Del Prete;Eduardo Palermo
Ultimo
2024

Abstract

Lower limb amputation causes a loss of motor and proprioceptive abilities in affected individuals. Different prostheses have been created to compensate for this deficit. However, most of these devices are passive and provide no sensory feedback to the amputee. Several solutions have been proposed to restore different typologies of sensation, driven by mechanical information obtained through sensors positioned on the anatomical district of interest, with specific limitations. This paper presents the mechanical and thermal characterization of a novel 3D-printed elastomeric strain sensor filled with liquid metal. It is designed to measure the strain on the cosmetic cover of a trans-tibial prosthesis to provide information to a feedback system. Static and dynamic tests were performed on the sensor, providing a graduation curve with satisfactory sensitivity, repeatability, linearity, and no signal attenuation over the 1 – 10 Hz frequency range. Thermal tests demonstrated an increase in the electrical resistance of the sensor up to 2.5% in the temperature range of 20 – 40 °C.
2024
3D printing, elastomeric sensor, liquid metal, lower limb amputation (LLA), proprioception, strain sensor, stretchable sensor
01 Pubblicazione su rivista::01a Articolo in rivista
A 3D printed elastomeric strain sensor with mechanical and thermal characterization for Restoring Proprioception in Lower Limb Amputees / CASTELLI GATTINARA DI ZUBIENA, Francesco; Paolucci, Matteo; D’Alvia, Livio; DEL PRETE, Zaccaria; Palermo, Eduardo. - In: IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT. - ISSN 0018-9456. - (2024).
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/1714273
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