Abstract: Modular arm prosthesis, for amputations higher than the level of the forearm. With the feature of being modular, which gives us an advantage that reduces the repair time by replacing the module quickly. The Socket-stump module which can be adjusted to several stumps thanks to its pneumatic system for grip, decreases the level of customization of each prosthesis thus reducing the manufacturing time and cost of production of each prosthesis, as well as its easy control by means of myoelectric sensors.