Figure 3

" Automatic Insulin Infusion System" (AIIS) for Inpatient Treatment: Proposed architecture. Proposed architecture of the "Automatic Insulin Infusion System" (AIIS) for Inpatient Treatment (see text). The nano amperimetric current produced by the subcutaneous glucose sensor located at the forearm of the patient, is shown entering an analog-digital converter. This device has two tasks. (a) To continuously measure the current from the sensor, and average it every five minutes, and (b) to transform the 5-minute average into a digital signal, that is submitted to the computer (where the controller is located) by means of an USB cable. From the computer, two USB cables are connected to infusion pumps, one for insulin, and the other for glucose solution. Note the low-dead-space catheter placed in a vein of the forearm of the patient. The low dead space allows for a rapid transition from insulin to glucose infusion and vice-versa.