Abstract  Numerous studies have shown that
inadequate oxygen management may be injurious to
patient´s health. According to oxygen saturation
measurements the oxygen supply must be increased or
decreased (FiO2). This paper shows the development of a
self-regulating device support with visual interface, that
according to the desired parameters set, will accurately
deliver the minimum oxygen amount required that the
patient needs. The control system is based on the fuzzy
logic theory implemented in a microcontroller. Oxymetry
was used to obtain the patient saturation data. The
developed instrument allows medical staff to have a
device that automatically  controls the concentration
provided reducing the incidence of diseases such as
Retinopathy of Prematurity (ROP).