An occlusion device intended for blocking perivalvular leak channels that are found following heart valve implantation between the heart valve and the surrounding tissue. The occlusion device has a stent and a covering that is attached to the stent surface. A blocking fabric extends across the lumen of the stent to block blood flow. The stent pattern and wall structure provide for small radius of curvature bends to fill narrow channels that cause the perivalvular leaks.