Fetoscopy is a surgical procedure in which a tiny telescopic camera is introduced into the uterus and the amniotic sac through a small incision in the mother’s abdomen. The camera is inserted under ultrasound guidance and is only 1-2 mm in width. Once the camera is inserted, the surgeon can see the fetus, the placenta and the inside of the womb on a television screen. Alongside the camera, the surgeon can insert different small instruments, such as a laser fiber that releases heat energy, catheters, needles, special balloons etc.

Source
http://womensandinfantshealth.ca/treatments_therapies/fetoscopy/