The Adiana system was a type of permanent birth control for women. The Adiana system included two small silicone pieces that were placed in the fallopian tubes. After several months, scar tissue formed around the silicone inserts, blocking the fallopian tubes and preventing sperm from reaching an egg. The Adiana system still provides permanent contraception for women who previously had the system placed in their fallopian tubes. The Adiana sterilization procedure consisted of four steps that do not involve an incision and could be performed in a doctor's office using local anesthesia in as little as 15 minutes. The gynecologist then uses inserts a hysteroscopy into the uterus so he can see what he is doing. (A hysteroscopy is an endoscopy inserted into the womb. An endoscopy is an optical instrument fitted with a fiber optic light source and attached to a video unit, which displays the view inside the uterus.) Then, radio signals are directed at the fallopian tubes to create a lesion in each tube. A catheter (a very thin tube) is inserted via the cervix and used to deliver a very tiny piece of soft silicone (no bigger than a grain of rice) into each fallopian tube. After the procedure, healthy tissue grows on and around this piece of silicone and creates a complete and permanent blockage of each tube. This prevents eggs from a woman's ovaries travelling down the fallopian tubes where they can be fertilized by her partner's sperm.