This research aims to design and develop a product for the charging and handling of smartphones, which reduces the symptoms of the carpal tunnel at the time of using the selected prototype and which can be revalidated by means of myoelectric signals. In the first stage, the method presents three different designs modeled in specialized three-dimension software, dedicated to managing the lifecycle of new products. In the product lifecycle management process of industrial design, the manufacture of the three designs was obtained by going through a posture analysis with the simulation of one of these designs, such as the accessory version three prototype, this being the selected version of the computer aided design, computer aided manufacturing, computer aided engineering, which beat the hypothesis of this research work. The accessory version three of the prototype supports the three aspects expected in this study, the first and most important the physiological aspect; due to the fact that it allows to use the telephone in a healthy way, minimizing the symptoms or tension of the carpal tunnel, the functional analysis was validated by making comparisons with the results of the different superficial electromyography shots applied to the hand of a patient, holding or manipulating each one of them accessories (accessory version three vs. accessory on the current market) and the smartphone, the second technological aspect; because the prototype offers a safe charging station or stage and finally the functional aspect; because it is an innovative prototype and has versatility in the use and handling of Smartphones as a new product.