A submicron structure includes a silica body defining a plurality of pores that are suitable to receive molecules therein, the silica body further defining an outer surface between pore openings of said plurality of pores; and a plurality of anionic molecules attached to the outer surface of the silica body. The first resonator has a first frequency pass band and a second frequency pass band. A plurality of substantially mutually parallel conductive lines is defined from the layer of conductive material. The filling composition is injected to bring the balloon wall into contact with the vessel wall at the vascular site. Relatively high electric field flux density at a tip of the spear may be reduced or avoided by practice of the invention. The contents transfer apparatus comprises a plurality of members, arrayed substantially continuously, and driving means for independently driving the plurality members.