Minimally invasive procedures (also called minimally invasive surgeries) encompass surgical techniques that limit the size of the incision and thus reduce wound healing, associated pain and risk of infection. Surgery is the definition of invasive and many operations require a certain size of open surgery, in which the incisions made can sometimes leave large, painful sores that take time to heal. Minimally invasive procedures have been developed by various medical technologies. An endovascular aneurysm repair is an example of minimally invasive surgery that is much less invasive than that of an open aortic surgery. This minimally invasive surgery has become the most common method of repairing abdominal aortic aneurysms in 2003 in the United States.  The minimally invasive procedures of pioneers are interventional radiologists. Through the use of imaging techniques, radiologists can use direct intervention tools to guide the body through catheters rather than surgery.