An implantable device for constant collection and dosage of glycemia with real-time monitoring, with no need of external collection by punctioning which is constituted by a metal compartment, hermetically sealed with the cap, containing at least a micro-computerized mini-center fed by the battery or similar, which is externally rechargeable. The device contains a sensor which collects a portion of the circulating blood and reads glycemia levels in real time, sending reading information through the transmission component. The device is connected to an inlet catheter with its collecting edge duly implanted by means of punctioning at the subclavian vein, to deviate a small flow of blood to pass through within said dosage and monitoring device, thus allowing the sensor to verify the glycemic dosage and following its natural course by exiting the exit catheter through the outlet edge, thus returning to the blood current within said subclavian vein.