Report about experience with a cubic supperting pessary for the prophylaxis and therapy in cervixinsufficiency or inpending premature delivery. The indication, selection, evaluation of riscfactors and the application of a complex therapy are discussed.--Information on therapeutic results and a first conclusion concerning the longtime incorporation of pessaries during pregnancy and the questions related to this. For the period under review, in which intensive prophylactic measures were carried out, a considerable decrease in premature deliveries could be achieved in the territory of pregnancy care center attached to our hospital.