The objective of this work is the design and simulation of a prototype handbike with electric assistance, adaptable to a conventional wheelchair, for people with paraplegia in the city of Loja. The proposal seeks to improve autonomous mobility in urban environments through a technical, ergonomic and accessible approach. The development was based on national and international standards such as NTE INEN 2245, 2247, 2855 and UNE-EN 12184, establishing parameters such as a maximum speed of 15 km/h, operating slope up to 10° and a user weight of 100 kg. The design was developed in Autodesk Inventor, considering anthropometric data and regulatory requirements, ensuring compatibility with various wheelchairs and urban conditions. Structural validation was performed in Ansys Workbench software using finite element analysis, achieving a mesh quality of 63.59% and simulations in plane and slope. The structure, designed in annealed AISI 403 stainless steel, showed Von Mises stresses of 53.64 MPa on the flat surface and 50.31 MPa on the slope, with safety factors greater than 12. It is concluded that the design is technically and functionally viable, complying with regulations and offering an accessible alternative to improve the mobility of people with paraplegia in urban environments.