Introducer Sheath offers you a blend of flexibility, support, and visualisation—the capability you need to respond to your challenging cases. Coronary catheterization is a minimally invasive procedure to access the coronary circulation using a catheter. The procedure uses a special dye that visualises the blood flow through the heart. The procedure begins with access to the femoral or radial arteries. A needle is inserted through the skin into the femoral artery. The needle is withdrawn until a flash of blood appears.