A fluid-filled intrauterine device: initial clinical trials.

Area of Science:

• Reproductive Health
• Medical Devices
• Gynecology

Background:

• Intrauterine devices (IUDs) are effective contraceptives.
• Saline-filled IUDs offer a potential alternative for women seeking reversible contraception.
• Clinical data on the performance of saline-filled IUDs, particularly in diverse patient populations, is important for understanding their efficacy and safety.

Purpose of the Study:

• To assess the clinical performance of a saline-filled intrauterine device (IUD).
• To evaluate pregnancy, expulsion, and removal rates in both multiparous and nulliparous women.
• To identify areas for device improvement based on initial trial outcomes.

Main Methods:

• A clinical trial involving 697 women (397 nulliparous, 307 multiparous) using a saline-filled IUD.
• Data collection over 6,672 woman-months of use.
• Analysis of cumulative rates for pregnancy, expulsion, medical removal, and continuation.

Main Results:

• For multiparous women: pregnancy rate 1.5%, expulsion 10.5%, medical removal 10.9%, continuation 68%.
• For nulliparous women: pregnancy rate 4.3%, expulsion 19.4%, medical removal 14.3%, continuation 58%.
• Nulliparous women experienced higher expulsion and medical removal rates compared to multiparous women.

Conclusions:

• The saline-filled IUD demonstrated varying performance between nulliparous and multiparous women.
• Higher expulsion and removal rates in nulliparous women indicate a need for device optimization.
• Ongoing efforts focus on modifying IUD geometry and content to reduce expulsion and bleeding-related removals.