Essure Transvaginal Ultrasound (TVU) Study

Inclusion Criteria: * Women who are 21 to 44 years of age * Women who are between 90-300 pounds (40-136 kilograms) * Women who are scheduled to undergo an Essure micro-insert placement procedure for permanent birth control * Women who are willing to accept the risk of pregnancy occurring while relying on the Essure device for prevention of pregnancy * Women who are believed to have two viable fallopian tubes * Women who are able and willing to provide written informed consent * Women who have the mental capacity to understand the Informed Consent, comply with the protocol requirements, and provide reliable feedback regarding device wearing * Women who can be available for all study visits * Women who are willing to allow data to be shared with the sponsor and with regulatory bodies * Women who are not contraindicated for the Essure procedure according to the Essure Instructions for Use (IFU) Exclusion Criteria: * Women who have known proximal tubal occlusion in either fallopian tube * Women who have had a fallopian tube sterilization procedure * Women who have a unicornuate uterus * Women who have known endometrial or myometrial pathology that is likely to prevent access to the fallopian tube ostia * Women who are scheduled to undergo any other intrauterine procedures at the time of Essure placement * Women who are pregnant or suspected of being pregnant * Women who have had a delivery or termination of pregnancy within the last six weeks * Women who have an active or recent upper or lower pelvic infection * Women who are contraindicated for Essure micro-insert placement according to the Essure Instructions for Use (IFU) * Women who have a known intolerance to transvaginal imaging