This document describes the design and development of medical devices including hip and knee prostheses and related instruments. It discusses the 3D modeling and technical documentation created for the prostheses and instruments. It also details the complete development and manufacturing of total hip uncemented and cemented systems, including femoral stems, acetabular cups, liners, and various surgical instruments. Additionally, it outlines the concept and redesign of shark pliers, including sketches, ergonomic and functional optimization, and the final manufactured prototype.