Components in the interior of an EUV lithography device for extreme ultraviolet and soft X-ray wavelength range are cleaned by igniting a plasma, adjacent to the component to be cleaned, using electrodes, wherein the electrodes are adapted to the form of the component to be cleaned. The bioscaffold can be used as an epicardial patch for the delivery of therapeutic cells into myocardial tissue. The said solid composition is obtained by mixing the components, vaporising the fats, calibrating the dry, fluid granular material and compressing the granular material in a stock cube press. Thus two parallel electrical paths are formed between the first and second mating portions when the contact electrically mates with the two electrical components.