The techniques of transcatheter embolization of unwanted blood vessels in patients with congenital heart disease have evolved considerably during the past 25 years. There are many different anatomical lesions requiring different approaches and devices. The main types of devices used can be classified into particles, coils, and plugs. It is important for the operator to be familiar with a range of these devices. The results of transcatheter embolization are usually excellent, and technical problems and complications can usually be overcome by attention to detail and persistence. The types of devices in common use and their clinical applications are discussed.