Methods, devices, kits and compositions to treat a myocardial infarction. According to the invention, at least a height of the section of the second crystal type and a lateral thickness of the active region is formed perpendicular to the main direction, in such a manner that the lattice strain in one of the sections of the first crystal type also depends on the lattice constants in the other section of the first crystal type. The blades preferably have a single bevel. A second color separating unit selectively causes the plurality of monochromatic rays that are passed through the first color separating unit to be reflected therefrom or passed therethrough. Another aspect of the invention is a method of implanting an endoprosthesis which includes a stent, providing a cover with variable porosity in the radial direction, connecting the stent to the cover with an adhesion layer to form a covered stent, and implanting the covered stent within a body lumen of a patient.