The present invention provides catalyst components comprising a compound having a weakly coordinating anion salt and a reactive cation, in particular a compound of the formula MxQy. The invention is also drawn to diagnosis kits for the implementation of the method. The first area of the information carrier includes the concealed information that is completely covered by the second area, rendering it invisible when the two areas are attached. The device is operated to secure the first component to the first vessel, couple the second component to the first component, and then release the components to complete the anastomosis.