Wearables
This device extracts the main gait parameters using FSR embedded in modified insoles and IMUs distributed along the affected limb to provide real-time biofeedback to the user.
A total of 3 IMUs are mounted on the foot, on the lower, and on the upper leg segments through velcro straps, with stability and wearability provided by the cases in the figure below. Each IMU PCB is sandwiched between the upper and the lower parts of the case. Openings in the bottom component allow insertion of the velcro strap.
The FSR and IMU sensors communicate with the RPI which is enclosed in the box illustrated in the figure below. The base hosts the battery of the device and a support onto which the RPI is anchored by means of screws. The cover has openings for wiring and monitoring of the LED indicating the on/off status of the main PCB. The box is to be worn at the waist via the built-in hook.
Both the IMU case and the RPI box were manufactured using 3D-printing, due to its several advantages over other techniques, including low costs, fast prototyping, design customisability, and single- step fabrication. A commercially-available printer was used and Polylactic acid (PLA) was the chosen material. A layer resolution of 0.1 mm under standard operating conditions was therefore ensured.
The technical drawings and .stl files are located in the Hardware folder for more information.