A fluid-filled intrauterine device: initial clinical trials.

Initial clinical trials of a saline-filled IUD were conducted with 697 women (397 nulliparas and 307 multiparas) experiencing 6,672 woman-months of use. The cumulative rates for multiparas were: pregnancy 1.5, expulsion 10.5, medical removal 10.9, continuation 68. For nulliparous women the rates were: pregnancy 4.3, expulsion 19.4, medical removal 14.3, continuation 58. Efforts are being made to modify the geometry and content of this IUD to decrease the expulsion rate and removals for bleeding.