The authoress reports the experience realized in a out-body depuration unit of a military hospital, in Rio de Janeiro, with the creation of the Simplified Closed System in manual internittent peritoneal dialysis, from the old and convetional manual DPI device. The new simplified closed system was tested by nurse on a group of 17 patients from 1986 to 1989. The old conventional devide was used on 11 patients from 1982 to 1985. The benefices proceeding the new system are reported and discussed by comparing to the old device