Dictionary.net

An instrument for rectifying uterine displacements- as anteversion and retroversion, consisting of a stem which is introduced into the uterus; this stem is attached to a flattened ovoid bulb or ball, on which the cervix uteri rests.-Connected with this is an external part or wire frame, which is attached, at one extremity, to a flat tubular portion, passing into the vagina, to be fixed to the intra-uterine portion. The wire frame is made to press upon the pubis, so that the pessary can be kept in position in utero. This is essentially the intra-uterine pessary of Professor Simpson of Edinburgh.