| abstract |
An intrauterine contraceptive delivery device for administering an anti-fertility agent at a controlled rate for a prolonged period of time is comprised of a shaped body having a cross member and a depending member defining a ''''T.'''' The body is comprised of a wall surrounding at least one reservoir containing an anti-fertility agent. The reservoir is formed of a liquid carrier permeable to the passage of the agent and in which the agent has limited solubility. The wall surrounding the reservoir is formed in at least a part of a release rate controlling material permeable to the passage of the agent, but the rate of passage of the agent through the wall is lower than the rate of passage through the carrier so that release by the wall is the release rate controlling step for releasing the anti-fertility agent from the ''''T'''' shaped intrauterine contraceptive antifertility delivery device. |