[Our experiences with Mayer-Ringpessary in the prevention of premature labor (author's transl)].

After very good results with a new model of the Mayer-Ringpessary made of organic glass the authors used this "unbloody cerclage" as a method of choice with all patients in their district (180 000 inhabitants) with partus praematurus imminens. It is necessary controls to apply the method in stage of this complication in good-time. There were below 10% of immature children in 405 high risk patients and only 1,2% to 1500 g. They succeded to delay the delivery in more favourable time to shorten the hospitalisation and unability considerably. Perinatal mortality was also favourably influenced. The details are in tables.