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Sensorization of Lower Limb Socket for Real-Time Pressure Monitoring

Fimbres Ramirez, Roy (2024) Sensorization of Lower Limb Socket for Real-Time Pressure Monitoring.

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Abstract:Abstract— Lower limb amputees patients experience an extraordinarily high incidence of skin lesions and eventual prosthesis abandonment. Common issues are pain and discomfort, which can be attributed to high local pressures. Patients face volume fluctuations both in the short and long term, which can hinder proper prosthetic use. To address this issue, a sensory system is proposed that focuses on key areas required monitoring by employing inductance properties of coils (Fig. 1). Here in this report, three conical Spring Sensors (SS) are explored and evaluated through compression tests, demonstrating a repeatable response to changes in length. The linear models for the spring sensors SS1, SS2 and SS3 exhibited mean relative errors of 0.2355, -0.0531, -0.0057, respectively. Moreover, SS2 and SS3 can estimate the force with a mean relative error of -0.0014 and -0.1156, and RMSE and Standard deviation of 0.00483±0.0049, 0.0101±0.0102uH respectively. These characteristics, combined with their low cost and compact size, make soft sensors ideal candidates for pressure sensing. Moreover, the proposed sampling areas for the sensing array offer an alternative to address the inherent challenge of monitoring the residual limb. This paper provides a proof of concept for the proposed model and inductance sensors as a viable alternative.
Item Type:Essay (Master)
Faculty:ET: Engineering Technology
Subject:50 technical science in general, 52 mechanical engineering, 53 electrotechnology
Programme:Biomedical Engineering MSc (66226)
Link to this item:https://purl.utwente.nl/essays/103842
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