Vaginal contraceptive.

摘要

Contraceptive device for use within the vaginal cavity at a posn. posterior to the introitus and near to the cervicalos is shaped to be retained in the vagina. It has a container(s) fixed to it, and each container wall is at leats partly of non-porous semipermeable membrane. The container holds a reservoir of spermicide comprising aq. micelle-forming spermicidal surfactant (I) at a concn. >= the critical micelle cocn. of the (I). The container(s) is kept in posn. by an approp. arrangement that ensures that the membrane is on the face of the device to form a transport surface. The device can be inserted into the vagina by the user and when in posn., it remains there even during intercourse. The devices are designed to remain in the vagina during the time between menstrual period with prolonged release of (I).