<unk>  intervention is less invasive than open fetal surgery. It can be often be achieved with just a small guided wire sent through a needle-puncture of the skin (percutaneous), though in some cases it may require that a small opening be made in the mother's abdomen.
The fact that it is less invasive reduces the mother's postoperative recovery and lessens the troubles with preterm labor.<unk>  has proven to be very useful for some, but not all, fetal conditions. Some examples include:
Twin-twin transfusion syndrome - Laser Ablation of Vessels
Fetal bladder obstructions
Aortic or Pulmonary Valvuloplasty - opening the Aortic or Pulmonary fetal heart valves to allow blood flow
Atrial Septostomy - opening the inter-atrial septum of the fetal heart to allow unrestricted blood flow between the atriums
Congenital diaphragmatic hernia - Balloon tracheal occlusion
Fetendo
Culmen 
Pennyroyal
Crista
Elm
Caduet
Wonder 
Libido