Lower Arm Prosthesis

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The lower arm prosthesis designed by the Biomechatronics Club at the University of Waterloo aims to offer an affordable alternative, utilizing 3D printed parts. The low-cost design provides opportunities for accessible medical devices worldwide, yet it is crucial to note that this prototype has not been thoroughly tested. Consisting of various printable components, most are made with ABS plastic and require water-soluble supports for accuracy. Pins need 100% infill for strength while some parts, like finger joints, wrist, and upper arm band, use flexible polyurethane filament (NINJAFLEX) with a shore hardness of about 85A for flexibility. If unavailable, ABS can be used but will limit joint flexibility. The design is an active prosthesis that utilizes EMG signals to control hand movement via motors and fishing wires. Attachment involves Velcro on the upper arm band, with customization options for padding and size adjustments. This innovative and cost-effective prosthetic design demonstrates the potential of 3D printing in medical technology.