I wondered if anyone had had this? From the NHS site-
A narrow tube with a telescope at the end, called a hysteroscope, is passed through your vagina and cervix. A guidewire is used to insert a tiny piece of titanium metal (called a microinsert) into the hysteroscope, then into each of your fallopian tubes. This means that the surgeon does not need to cut into your body.
The implant causes the fallopian tube to form scar tissue around it, which eventually blocks the tube.