Design and Implementation of a Transfer System Incorporated in a Wheelchair Prototype for Transfer to Cars

This study presents the design, implementation, and preliminary evaluation of a wheelchair prototype incorporating an electromechanical system for assisted transfer to vehicles. The project aimed to develop a safe, ergonomic, and low-cost alternative capable of reducing the physical effort required during patient transfers. The methodology combined mechanical and control system design, CAD modeling, local prototype fabrication, and functional testing under supervised conditions with two volunteer patients, complemented by an extensive literature review and input from professionals in Biomedical Engineering, Mechanical Engineering, Metallurgy, and Rehabilitation. The results demonstrated smooth and stable seat translation, minimal vibration and noise, and a significant reduction in perceived exertion compared with manual transfers. Structural analysis confirmed adequate mechanical rigidity under loads up to 160 kg, and user feedback indicated improved comfort and independence. The proposed design highlights the feasibility of integrating assistive technologies using locally available materials in Paraguay, representing a practical step toward intelligent mobility systems that enhance safety, autonomy, and quality of life for wheelchair users. The prototype is intended for individuals below the established maximum weight and without cognitive or upper-limb functional limitations.