Samueli School of Engineering

This poster highlights the functional prosthetic device design for partial hand amputation coupled with highly limited wrist mobility and additional limb amputations. The 3D printed, mechanical, body-powered prosthesis is designed for a patient with disarticulation of the thumb and index finger at the metacarpophalangeal joint level, the third and fifth digits at the proximal level, and the fourth digit distally. The partial three remaining fingers demonstrate limited range of motion. The low-cost prosthetic device for the right hand features both a static prehension prosthesis and a manually adjustable supernumerary thumb, custom fit for the participant’s anatomical considerations. The prosthetic device utilizes a one-way bearing ratchet mechanism to actuate the prosthetic thumb with nearly infinite stopping resolution. Molded silicone adhered to the underside of the 3D printed prosthetic thumb allow enhanced gripping ability. The 3D printed arm cuff is secured to the forearm using a BOA dial system with a custom-made 3D printed dial top.