Robotic prostheses for trans-radial amputees are expensive in Colombia and, as a result, most of the population in need can not afford one. We designed, built, and validated a myoelectric prosthesis for trans-radial amputee patients. To achieve this, we used an iterative methodology that started by identifying the needs of the users to then design, implement, and validate the product. The prosthesis was designed for a specific patient, with whom we worked together to determine the specifications. Consequently, each part was designed, developed, and tested. Finally, the parts were integrated and validated to produce the myoelectric hand prosthesis which solved the patient necessity.