Pressure sensor system for customized scoliosis braces

Fuss, Franz Konstantin and Ahmad, Asliza and Tan, Adin Ming and Razman, Rizal Mohd and Weizman, Yehuda (2021) Pressure sensor system for customized scoliosis braces. Sensors, 21 (4). ISSN 1424-8220, DOI

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Hard-shell thoracolumbar sacral orthoses (TLSOs) are used for treating idiopathic scoliosis, a deformation of the spine with a sideways curvature. The pressure required inside the TLSO for ideal corrective results remains unclear. Retrofitting TLSOs with commercially available pressure measurement systems is expensive and can only be performed in a laboratory. The aim of this study was to develop a cost-effective but accurate pressure sensor system for TLSOs. The sensor was built from a piezoresistive polymer, placed between two closed-cell foam liners, and evaluated with a material testing machine. Because foams are energy absorbers, the pressure-conductance curve was affected by hysteresis. The sensor was calibrated on a force plate with the transitions from loading to unloading used to establish the calibration curve. The root mean square error was 12% on average within the required pressure range of 0.01-0.13 MPa. The sensor reacted to the changing pressure during breathing and different activities when tested underneath a chest belt at different tensions. The peak pressure reached 0.135 MPa. The sensor was further tested inside the scoliosis brace during different activities. The measured pressure was 0.014-0.124 MPa. The results from this study enable cheaper and mobile systems to be used for clinical studies on the comfort and pressure of braces during daily activities.

Item Type: Article
Uncontrolled Keywords: Pressure sensor; Scoliosis brace; Foam properties; Hysteresis; Calibration; Cost-effective development
Subjects: Q Science > QD Chemistry
R Medicine > RC Internal medicine > RC1200 Sports Medicine
T Technology > TA Engineering (General). Civil engineering (General)
Divisions: Faculty of Sports and Exercise Science (formerly known as Centre for Sports & Exercise Sciences)
Depositing User: Ms Zaharah Ramly
Date Deposited: 22 Jul 2022 08:11
Last Modified: 22 Jul 2022 08:11

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