Study Summary: This study is testing a new permanent birth control method called FemBloc. It is being conducted at multiple centers around the world. The study is "unblinded," which means both doctors and participants will know they are using FemBloc. After using FemBloc, participants will have an ultrasound (a special scan that uses sound waves to create images) to make sure it worked.

Eligibility: To join, you must be a woman aged 21-50 who wants to stop having children permanently. You need to be sexually active and have regular periods or be on birth control pills. You cannot join if you are unsure about not having more children, if you might be pregnant, have had certain surgeries, have or suspect any cancer in your reproductive organs, are planning any related medical procedures soon, or have unusual bleeding that needs checking.

• Length of Study: Participation involves the FemBloc treatment and a follow-up ultrasound.
• Visits Needed: Participants will need to visit a study center for the procedure and follow-up.
• Risks: As with any medical procedure, there are some risks. These will be explained before you join.