Angioplasty is a term describing a procedure used to widen vessels narrowed by stenoses or occlusions. There are various types of these procedures and their names are associated with the type of vessel entry and equipment used. In the case of a procedure involving the renal arteries, the point of entry could be the femoral artery in the groin and the catheter/guidewire system is passed through the aorta to the kidneys and the origin of the renal arteries. Catheters used during angioplasty contain balloons that are inflated to widen the vessel and stents to provide structural support for the vessel. Lasers may be used to assist in the break up of the fat or calcium plaque. Catheters may also be equipped with spinning wires or drill tips to clean out the plaque.